WO2022193935A1

WO2022193935A1 - Battery and electronic device

Info

Publication number: WO2022193935A1
Application number: PCT/CN2022/078500
Authority: WO
Inventors: 卢轮; 朱华; 陈伟; 陈宇飞; 邓斌
Original assignee: 荣耀终端有限公司
Priority date: 2021-03-15
Filing date: 2022-02-28
Publication date: 2022-09-22
Also published as: CN115084794A

Abstract

Provided are a battery and an electronic device, which relate to the technical field of electronic devices and can achieve a high energy density and the characteristic of fast charging to a certain extent. Specifically, the battery comprises a housing, a first bare cell, a second bare cell and a third tab, wherein the first bare cell is arranged in the housing, and the first bare cell comprises a first electrode plate, a second electrode plate and a first tab, the first tab being electrically connected to a current collector of the first electrode plate; the second bare cell is arranged in the housing, and the second bare cell comprises a third electrode plate, a fourth electrode plate and a second tab, the second tab being electrically connected to a current collector of the third electrode plate; and electrodes of the second electrode plate and the fourth electrode plate are simultaneously led out from the third tab, and the first tab, the second tab and the third tab have one end thereof extending through the housing to the outside of the housing. The battery provided in the embodiments of the present application is used to supply power to the electronic device.

Description

A battery and electronic device

This application claims the priority of the Chinese patent application with the application number 202110276595.3 and the invention title "A battery and its structure" filed with the State Intellectual Property Office on March 15, 2021, and filed with the State on July 31, 2021 Priority of the Chinese Patent Office, application number 202110877359.7, and invention title "A Battery and Electronic Device", the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of electronic devices, and in particular, to a battery and an electronic device.

Background technique

As the performance of consumer electronic products such as mobile phones continues to increase, the requirements for battery life and charging speed are also increasing. However, for batteries, long battery life and fast charging are usually two incompatible characteristics. The increase in battery capacity is often accompanied by the weakening of fast charging capability, and the improvement in fast charging capability usually leads to the loss of battery energy density, that is, The decrease in battery capacity per unit volume. It is difficult to find a battery that can combine high energy density and fast charging characteristics at the same time.

SUMMARY OF THE INVENTION

The embodiments of the present application provide a battery and an electronic device, which can simultaneously take into account high energy density and fast charging characteristics to a certain extent.

To achieve the above object, the embodiments of the present application adopt the following technical solutions:

In a first aspect, some embodiments of the present application provide a battery including a case, a first bare cell, a second bare cell, and a third tab. The first bare cell is arranged in the casing. The first bare cell includes a first pole piece, a second pole piece and a first pole lug. One of the first pole piece and the second pole piece is a positive pole piece and the other is a negative pole piece. The first tab is electrically connected to the current collector of the first pole piece. The second bare cell is disposed in the casing, and the second bare cell includes a third pole piece, a fourth pole piece and a second pole lug. One of the third pole piece and the fourth pole piece is a positive pole piece and the other is a negative pole piece. The second tab is electrically connected to the current collector of the third pole piece. The electrodes of the second pole piece and the fourth pole piece are drawn out from the third tab at the same time, and one ends of the first tab, the second tab and the third tab extend through the housing to the outside of the housing.

In this way, the first tab and the third tab of the battery form the first charging and discharging port, and the second tab and the third tab of the battery form the second charging and discharging port. At least two charge-discharge links can be formed by the first charge-discharge port and the second charge-discharge port, thereby improving the charge-discharge speed of the battery. At the same time, since the first charging and discharging port and the second charging and discharging port share the third tab, the number of tabs in the battery can be reduced to ensure the volume energy density of the battery. Therefore, to a certain extent, both the charge-discharge speed and the volumetric energy density of the battery are taken into account. At the same time, due to the small number of tabs in the battery, under the premise of a certain size of the battery, the width of a single tab (including the first tab, the second tab and the third tab) can be widened, so that the Further improve the charging capacity and optimize the cooling effect.

In a possible implementation manner of the first aspect, the current collector of the second pole piece and the current collector of the fourth pole piece are electrically connected to form a whole, and the third tab is electrically connected to the whole. In this way, the setting positions of the third tabs are more, and the flexibility is better.

In a possible implementation manner of the first aspect, the current collector of the second pole piece and the current collector of the fourth pole piece are electrically connected to form the whole through contact and electrical conduction, direct welding or integral molding. In this way, the space occupied by the electrical connection portion between the first bare cell and the second bare cell is small, which is beneficial to improve the volume energy density of the battery.

In a possible implementation manner of the first aspect, the third tab can be electrically connected to a part of the current collector in the whole that belongs to the second pole piece, or can be electrically connected to a part of the whole that belongs to the fourth pole piece on the collector. The third tab may also be located between the second pole piece and the fourth tab. On this basis, the third tab is electrically connected not only to the part of the current collectors belonging to the second pole piece in the above-mentioned whole, but also to the part of the current collectors belonging to the fourth pole piece in the above-mentioned whole.

In a possible implementation manner of the first aspect, the third tab may be electrically connected to a portion of the second pole piece close to the fourth pole piece. In this way, the distance from the third pole lug to each part on the fourth pole piece can be shortened, so that the impedance can be reduced to a certain extent and the charging and discharging speed can be increased.

In a possible implementation manner of the first aspect, the third tab may be electrically connected to a portion of the fourth pole piece close to the second pole piece. In this way, the distance from the third pole lug to each part on the second pole piece can be shortened, so that the impedance can be reduced to a certain extent and the charging and discharging speed can be increased.

In a possible implementation manner of the first aspect, the number of the third tabs is two, and both of the two third tabs are electrically connected to the partial current collectors belonging to the second pole piece in the above-mentioned whole. The two third tabs and the first tabs respectively form first charge and discharge ports, thereby obtaining two first charge and discharge ports. The two third tabs and the second tabs respectively form second charging and discharging ports, thereby obtaining two second charging and discharging ports. As a result, four charge-discharge links can be formed, so that the charge-discharge speed of the battery can be improved to a certain extent.

In a possible implementation manner of the first aspect, both the first bare cell and the second bare cell are wound bare cells.

In a possible implementation manner of the first aspect, both the first bare cell and the second bare cell are stacked bare cells. The first bare cell and the second bare cell are stacked. The surface of the first bare cell close to the second bare cell is formed by the current collector of the second pole piece. The surface of the second bare cell close to the first bare cell is formed by the current collector of the fourth pole piece. The current collector of the second pole piece of the first bare cell is electrically connected to the current collector of the fourth pole piece of the second bare cell as a whole. On this basis, the third tab is electrically connected to the whole. This structure is simple and easy to implement.

In a possible implementation manner of the first aspect, both the first bare cell and the second bare cell are stacked bare cells. The first bare cell and the second bare cell are arranged side by side. The number of the second pole pieces of the first bare cell is equal to the number of the fourth pole pieces of the second bare cell, and the second pole piece of the first bare cell and the fourth pole piece of the second bare cell are one by one. Correspondingly, the current collector of each second pole piece is electrically connected to the corresponding current collector of the fourth pole piece as a whole. On this basis, the third tab includes a plurality of tab units. The plurality of tab units are respectively electrically connected to the above-mentioned plurality of wholes. This structure is simple and easy to implement.

In a possible implementation manner of the first aspect, the third tab is disposed between the current collector of the second pole piece and the current collector of the fourth pole piece, and the third tab is electrically connected to the current collector of the second pole piece on the fluid, and the third tab is also electrically connected to the current collector of the fourth pole piece, and one ends of the first tab, the second tab and the third tab protrude out of the housing through the housing.

In a possible implementation manner of the first aspect, the third tab includes a plurality of tab units and transition conductors, and the plurality of tab units are respectively composed of a current collector of the second pole piece and a current collector of the fourth pole piece It is directly extended and formed, and the transfer conductor is electrically connected with the plurality of tab units.

In a possible implementation manner of the first aspect, the first pole piece is a positive pole piece, the second pole piece is a negative pole piece, the third pole piece is a positive pole piece, and the fourth pole piece is a negative pole piece. On this basis, since the first tab is electrically connected to the current collector of the first pole piece, the second tab is electrically connected to the current collector of the third pole piece, and the third tab is used to draw out the second pole piece and The electrode of the fourth pole piece. Therefore, the first tab and the second tab are positive tabs, and the third tab is a negative tab. The first bare cell and the second bare cell are connected in parallel to form a composite bare cell. The first charge and discharge port and the second charge and discharge port are arranged in parallel.

In a possible implementation manner of the first aspect, the first pole piece is a negative pole piece, the second pole piece is a positive pole piece, the third pole piece is a negative pole piece, and the fourth pole piece is a positive pole piece. On this basis, since the first tab is electrically connected to the current collector of the first pole piece, the second tab is electrically connected to the current collector of the third pole piece, and the third tab is used to draw out the second pole piece and The electrode of the fourth pole piece. Therefore, the first tab and the second tab are negative tabs, and the third tab is the positive tab. The first bare cell and the second bare cell are connected in parallel to form a composite bare cell. The first charge and discharge port and the second charge and discharge port are arranged in parallel.

In a possible implementation manner of the first aspect, the first pole piece is a positive pole piece, the second pole piece is a negative pole piece, the third pole piece is a negative pole piece, and the fourth pole piece is a positive pole piece. On this basis, since the first tab is electrically connected to the current collector of the first pole piece, the second tab is electrically connected to the current collector of the third pole piece, and the third tab is used to draw out the second pole piece and The electrode of the fourth pole piece. Therefore, the first tab is the positive tab, the second tab is the negative tab, and the third tab is the negative tab of the first bare cell and the positive tab of the second bare cell. The first bare cell and the second bare cell are connected in series to form a composite bare cell. The first charging and discharging port and the second charging and discharging port are arranged in series.

In a possible implementation manner of the first aspect, the first pole piece is a negative pole piece, the second pole piece is a positive pole piece, the third pole piece is a positive pole piece, and the fourth pole piece is a negative pole piece. On this basis, since the first tab is electrically connected to the current collector of the first pole piece, the second tab is electrically connected to the current collector of the third pole piece, and the third tab is used to draw out the second pole piece and The electrode of the fourth pole piece. Therefore, the first tab is the negative tab, the second tab is the positive tab, and the third tab is the positive tab of the first bare cell and the negative tab of the second bare cell. The first bare cell and the second bare cell are connected in series to form a composite bare cell. The first charging and discharging port and the second charging and discharging port are arranged in series.

In a possible implementation manner of the first aspect, the first bare cell and the second bare cell are wound bare cells or stacked bare cells.

In a possible implementation manner of the first aspect, the first bare cell is a first wound bare cell. The winding center of the first wound bare cell is the first winding center. The end of the first pole piece located at the first winding center extends beyond the end of the second pole piece located at the first winding center. That is to say, it is assumed that the end of the first pole piece located at the first winding center is the first end of the first pole piece, and the end of the second pole piece located at the first winding center is the first end of the second pole piece The orthographic projection of the first end of the first pole piece on the first end of the second pole piece is located outside the edge of the second pole piece. The first tab is electrically connected to the current collector at the first end of the first pole piece. In this way, in the first wound bare cell, the opposite sides of the first tab are surrounded by the first pole piece, and there is no need to use tab glue for insulation isolation treatment, thereby further improving the volumetric energy density of the battery .

In a possible implementation manner of the first aspect, the second bare cell is a second wound bare cell. The winding center of the second wound bare cell is the second winding center. The end of the third pole piece located at the second winding center exceeds the end of the fourth pole piece located at the second winding center. That is to say, it is assumed that the end of the third pole piece located at the second winding center is the first end of the third pole piece, and the end of the fourth pole piece located at the second winding center is the first end of the fourth pole piece The orthographic projection of the first end of the third pole piece on the first end of the fourth pole piece is located outside the edge of the fourth pole piece. The second tab is electrically connected to the current collector at the first end of the third pole piece. In this way, in the second wound bare cell, the opposite sides of the second tab are surrounded by the third pole piece, and there is no need to use tab glue for insulation isolation treatment, thereby further improving the volumetric energy density of the battery .

In a possible implementation manner of the first aspect, the first tab and the third tab form a first charge and discharge port, and the second tab and the third tab form a second charge and discharge port. The battery also includes a protection board, the protection board has a first charge and discharge circuit, a second charge and discharge circuit, a third charge and discharge port and a fourth charge and discharge port. The first charging and discharging circuit is electrically connected to the first bare cell through the first charging and discharging port, the third charging and discharging port is located on the first charging and discharging circuit, and the protection board is used for connecting with the power management module and the charging management module by means of the third charging and discharging port. The module and the charger are electrically connected to form a charge-discharge link. The second charging and discharging circuit is electrically connected to the second bare cell through the second charging and discharging port, the fourth charging and discharging port is located on the second charging and discharging circuit, and the protection board is used for connecting with the power management module and the charging management module by means of the fourth charging and discharging port The module and the charger are electrically connected to form another charge-discharge link. In this way, at least two charging and discharging links are formed, which can improve the charging and discharging speed of the battery, and at the same time, by means of the at least two charging and discharging links, one of the first bare cell and the second bare cell can be respectively charged and discharged. Charge and discharge management and detection of parameters such as capacity, cycle times, and health status can also be performed on both the first bare cell and the second bare cell, as well as capacity, cycle times, and health status detection. To maximize the utilization of battery performance and state of health, it is also possible to charge one bare cell and discharge another bare cell at the same time.

In a possible implementation manner of the first aspect, the battery further includes a third bare cell, the third bare cell is disposed in the housing, and the third bare cell includes a fifth pole piece, a sixth pole piece and a fourth pole piece The tab, one of the fifth pole piece and the sixth pole piece is a positive pole piece and the other is a negative pole piece, and the fourth pole piece is electrically connected to the current collector of the fifth pole piece. The current collector of the sixth pole piece is electrically connected to the collector of the second pole piece as a whole, or the current collector of the sixth pole piece is electrically connected to the collector of the fourth pole piece as a whole, and one end of the fourth pole lug is pierced through. Protrudes out of the casing through the casing. In this way, in addition to the electrodes of the second pole piece and the fourth pole piece, the third tab can also lead out the electrodes of the sixth pole piece, which can further optimize the charging and discharging speed while taking into account the volumetric energy density.

In a possible implementation manner of the first aspect, the battery further includes a third bare cell and a fifth tab. The third bare cell is disposed in the casing, the third bare cell includes a fifth pole piece, a sixth pole piece and a fourth pole lug, one of the fifth pole piece and the sixth pole piece is a positive pole piece and the other It is a negative pole piece, and the fourth tab is electrically connected to the current collector of the fifth pole piece. The fifth tab is arranged between the current collector of the second pole piece and the current collector of the sixth pole piece, the fifth tab is electrically connected to the current collector of the second pole piece, and the fifth tab is also electrically connected to the second pole piece. on the current collector of the hexapole piece. Or, the fifth tab is arranged between the current collector of the fourth pole piece and the current collector of the sixth pole piece, the fifth tab is electrically connected to the current collector of the fourth pole piece, and the fifth tab is also electrically connected on the current collector of the sixth pole piece. One ends of the fourth tab and the fifth tab protrude out of the housing through the housing. In this way, while further optimizing the charging and discharging speed of the battery, the volumetric energy density can be taken into account to a certain extent.

In a possible implementation manner of the first aspect, the battery further includes a third bare cell. The third bare cell is disposed in the casing, and the third bare cell includes a fifth pole piece, a sixth pole piece and a fourth pole lug. One of the fifth pole piece and the sixth pole piece is a positive pole piece and the other is a negative pole piece, and the fourth tab is electrically connected to the current collector of the fifth pole piece. The third tab also includes a tab portion. The structure of the tab part is similar to the structure of the previous tab unit, the tab part is formed by the direct extension of the current collector of the sixth pole piece, and the transfer conductor is also electrically connected to the tab part. In this way, while further optimizing the charging and discharging speed of the battery, the volumetric energy density can be taken into account to a certain extent.

In a possible implementation manner of the first aspect, the transition conductor may also extend between the first bare cell and the second bare cell. It is assumed that the part of the transition conductor extending between the first bare cell and the second bare cell is the first part. The surface of the first bare cell close to the second bare cell is formed by the current collector of the second pole piece, and the surface of the second bare cell close to the first bare cell is formed by the current collector of the fourth pole piece. The first part is electrically connected to the current collector of the second pole piece, and the first part is also electrically connected to the current collector of the fourth pole piece. In this way, the contact area between the transfer conductor and the first bare cell, and between the transfer conductor and the second bare cell is larger, which can reduce the impedance and increase the charging and discharging speed.

In a second aspect, some embodiments of the present application provide an electronic device, the electronic device includes a housing, a power management module, a charge management module, and the battery according to any one of the technical solutions in the first aspect. Wherein, a battery compartment is arranged in the casing. The power management module and the charging management module are arranged in the casing. The battery is installed in the battery compartment, the battery is electrically connected with the power management module, and the battery is also electrically connected with the charging management module.

Since the electronic device provided in the embodiment of the present application includes the battery described in any of the above technical solutions, the two can solve the same technical problem and achieve the same effect.

In a third aspect, some embodiments of the present application further provide a method for processing a battery, the processing method comprising:

making a first bare cell and a second bare cell;

A third tab is arranged between the first bare cell and the second bare cell, and the third tab is welded to the current collector of the second pole piece in the first bare cell, and at the same time the third tab is welded. The ears are welded to the current collector of the fourth pole piece in the second bare cell to obtain a series or parallel composite bare cell;

A shell is used to encapsulate the above-mentioned composite bare cell, and an electrolyte is injected into the shell to obtain a cell.

Connect the protective plate on the battery core, that is, obtain a finished battery containing at least two series or parallel or combined series-parallel winding cores inside.

In a fourth aspect, some embodiments of the present application provide a battery processing system, where the processing system includes a first rolling device, a first rolling pin, a second rolling device, and a second rolling pin.

In the processing system provided by the embodiment of the present application, the first bare cell and the second bare cell can be formed by rolling and winding simultaneously by means of the first rolling device, the first rolling pin, the second rolling device and the second rolling pin The core, for example, can be rolled by a first rolling device and rolled by a first rolling pin to form a first bare cell, and rolled by a second rolling device and rolled by a second rolling pin to form a second core. Bare cell. In this way, the production efficiency of the first bare cell and the second bare cell can be improved.

In a possible implementation manner of the fourth aspect, a welding station is further included, and the welding station is arranged between the first winding needle and the second winding needle. Therefore, the welding station can be used to realize the welding of the third tab on the first bare cell and the second bare cell, which can improve the production efficiency of the battery.

Description of drawings

1 is a perspective view of an electronic device provided by some embodiments of the present application;

Fig. 2 is an exploded view of the electronic device shown in Fig. 1;

3 is a perspective view of a battery provided by some embodiments of the present application;

Figure 4 is an exploded view of the battery shown in Figure 3;

FIG. 5 is an exploded view of the cells in the battery shown in FIG. 4;

FIG. 6 is a schematic structural diagram of a battery provided by further embodiments of the present application;

Figure 7 is an exploded view of the battery shown in Figure 6;

FIG. 8 is a schematic structural diagram of a battery provided by further embodiments of the present application;

Figure 9 is an exploded view of the battery shown in Figure 8;

FIG. 10 is a schematic view of the end surface structure of the first bare cell in the battery shown in FIG. 9;

FIG. 11 is a schematic cross-sectional structural diagram of a part of the first bare cell shown in FIG. 10 along the a-a direction;

12 is a schematic structural diagram of the first pole piece in the first bare cell shown in FIG. 10 in an unfolded state;

FIG. 13 is another structural schematic diagram of the first pole piece in the first bare cell shown in FIG. 10 in the unfolded state;

FIG. 14 is another structural schematic diagram of the first pole piece in the first bare cell shown in FIG. 10 in the unfolded state;

15 is a schematic diagram of a connection structure between the first pole piece and the first pole tab in the unfolded state of the first bare cell according to some embodiments of the present application;

16 is a schematic structural diagram of the first pole piece shown in FIG. 15 after the separator and the second pole piece are stacked and wound to form the first bare cell;

17 is a schematic diagram of a connection structure between the first pole piece and the first pole tab in the unfolded state of the first bare cell according to some embodiments of the present application;

FIG. 18 is a schematic structural diagram of a first bare cell provided by further embodiments of the present application;

FIG. 19 is a schematic cross-sectional structure diagram of the first bare cell shown in FIG. 18 at line b-b;

FIG. 20 is another schematic cross-sectional structure diagram of the first bare cell shown in FIG. 18 at line b-b;

FIG. 21 is a schematic view of the end surface structure of the second bare cell in the battery shown in FIG. 9;

FIG. 22 is a schematic cross-sectional structural diagram of a part of the second bare cell shown in FIG. 21 along the c-c direction;

FIG. 23 is a schematic diagram of a connection structure of the first bare cell shown in FIG. 10 and the second bare cell shown in FIG. 21;

FIG. 24 is a schematic cross-sectional structure diagram of the structure shown in FIG. 23 at line d-d;

FIG. 25 is a schematic diagram of another connection structure of the first bare cell shown in FIG. 10 and the second bare cell shown in FIG. 21;

FIG. 26 is a schematic diagram of still another connection structure of the first bare cell shown in FIG. 10 and the second bare cell shown in FIG. 21;

FIG. 27 is a schematic diagram of a connection structure of a first bare cell and a second bare cell according to further embodiments of the present application;

FIG. 28 is a schematic cross-sectional structure diagram of the structure shown in FIG. 27 at the line e-e;

FIG. 29 is a schematic diagram of a connection structure of a first bare cell and a second bare cell according to further embodiments of the present application;

FIG. 30 is a schematic diagram of a connection structure of a first bare cell and a second bare cell according to further embodiments of the present application;

FIG. 31 is a schematic diagram of a connection structure of a first bare cell and a second bare cell according to further embodiments of the present application;

FIG. 32 is a schematic diagram of a connection structure of a first bare cell and a second bare cell according to further embodiments of the present application;

FIG. 33 is a schematic structural diagram of the connection structure shown in FIG. 32 when viewed from direction A;

FIG. 34 is a schematic structural diagram of a battery provided by further embodiments of the present application;

Figure 35 is an exploded view of the battery shown in Figure 34;

FIG. 36 is a schematic view of the end surface structure of the first bare cell in the battery shown in FIG. 35;

FIG. 37 is a schematic view of the end surface structure of the second bare cell in the battery shown in FIG. 35;

38 is a schematic diagram of the connection structure of the third tab shown in FIG. 35, the first bare cell shown in FIG. 36, and the second bare cell shown in FIG. 37;

FIG. 39 is a schematic structural diagram of a first bare cell, a second bare cell, and a third tab according to further embodiments of the present application;

FIG. 40 is a schematic structural diagram of a first bare cell, a second bare cell and a third tab according to further embodiments of the present application;

FIG. 41 is a schematic structural diagram of a battery provided by further embodiments of the present application;

Figure 42 is an exploded view of the battery shown in Figure 41;

FIG. 43 is a schematic diagram of the connection structure of the first bare cell and the second bare cell in the battery shown in FIG. 42;

Figure 44 is a schematic cross-sectional structure diagram of the structure shown in Figure 43 at line f-f;

Figure 45 is a schematic cross-sectional structure diagram of the structure shown in Figure 43 at the line g-g;

Figure 46a is a schematic cross-sectional structure diagram of the structure shown in Figure 43 at the line h-h;

Fig. 46b is another schematic cross-sectional structure diagram of the structure shown in Fig. 43 at the line h-h;

47 is a schematic diagram of a connection structure of a first bare cell and a second bare cell in a battery according to further embodiments of the present application;

FIG. 48 is a schematic diagram of a connection structure of a first bare cell and a second bare cell in a battery according to further embodiments of the present application;

FIG. 49 is a schematic structural diagram of a first bare cell, a second bare cell, and a third tab according to further embodiments of the present application;

FIG. 50 is a schematic diagram of the composition and structure of a composite bare cell provided by further embodiments of the present application;

FIG. 51 is a schematic diagram of the end surface structure of the composite bare cell shown in FIG. 50;

FIG. 52 is a schematic diagram of an end surface structure of a composite bare cell provided by further embodiments of the present application;

FIG. 53 is a schematic diagram of an end surface structure of a composite bare cell provided by further embodiments of the present application;

FIG. 54 is a schematic diagram of an end surface structure of a composite bare cell provided by further embodiments of the present application;

55 is a schematic diagram of the composition and structure of a first bare cell in a battery processing method provided by some embodiments of the present application;

56 is a schematic structural diagram of a battery processing system provided by some embodiments of the present application;

57 is a schematic diagram of the composition and structure of the second bare cell in the battery processing method provided by some embodiments of the present application;

FIG. 58 is a process flow diagram of a battery provided by some embodiments of the present application.

Detailed ways

In the embodiments of the present application, the terms "first", "second" and "third" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second", "third" may expressly or implicitly include one or more of that feature.

In the embodiments of the present application, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, but also Include other elements not expressly listed, or which are inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

In this embodiment of the present application, "and/or" is only an association relationship describing associated objects, indicating that there may be three kinds of relationships, for example, A and/or B, which may indicate that A exists alone, and A and B exist at the same time. B, there are three cases of B alone. In addition, the character "/" in this document generally indicates that the related objects are an "or" relationship.

The present application relates to a battery and an electronic device. In order to facilitate the description of the following embodiments, before introducing the embodiments of the present application, some professional terms to be mentioned in the embodiments of the present application are first introduced, specifically:

Battery casing: refers to the part of the battery used to encapsulate and protect the bare cell, the casing includes but is not limited to steel casing and aluminum-plastic film.

Aluminum-plastic film: Also known as aluminum-plastic packaging film, it includes at least three layers of materials. The middle layer is an aluminum layer, which acts as a moisture barrier. The outer layer is a nylon adhesive layer, which prevents the penetration of air, especially oxygen. The inner layer is a polypropylene (PP) layer, which acts as a seal and prevents the electrolyte from corroding the aluminum layer. The inner layer of the aluminum-plastic film is in contact with the electrolyte.

Electrolyte: It exists in each void of the bare cell inside the casing and is used as a carrier for transporting lithium ions in the battery. The electrolyte is generally prepared from high-purity organic solvents, electrolyte lithium salts, necessary additives and other raw materials under certain conditions and in a certain proportion.

Bare cell: including positive pole piece, negative pole piece and separator. Both the positive electrode and the negative electrode include a current collector and an electrode material coated on the current collector. The current collector of the positive electrode is usually aluminum foil. The current collector of the negative pole piece is usually copper foil. The separator, also known as the separator, is arranged between the positive pole piece and the negative pole piece, and is used to separate the positive pole piece and the negative pole piece of the bare cell to prevent the two pole pieces from directly contacting and causing a short circuit. The material of the separator is usually a polyolefin porous membrane.

Rolled bare cell: It is formed by stacking and winding four layers of materials: positive pole piece, separator, negative pole piece and separator.

Laminated bare cell: It includes positive pole pieces and negative pole pieces that are alternately and stacked together in sequence, and a separator is provided between adjacent positive pole pieces and negative pole pieces. Both the positive electrode and the negative electrode include a current collector and an electrode material coated on the current collector. The current collector of the positive electrode is usually aluminum foil. The current collector of the negative pole piece is usually copper foil. The separator is used to separate the positive pole piece and the negative pole piece to prevent the short circuit caused by direct contact between the two pole pieces. The separator can be a separator bag, a separator folded in a zigzag shape, or a plurality of single-piece separators. This application does not limit the specific structure of the separator in the laminated bare cell, as long as it can insulate and isolate the positive electrode. The plate and the negative pole piece can be used. The material of the separator is usually a polyolefin porous membrane. Compared with wound bare cells, laminated bare cells have stronger fast charging capability and greater flexibility in shape and tab position design.

Tab: used to lead the electrode of the bare cell to the outside of the casing. Specifically, the tabs used to draw out the positive electrodes of the bare cells are positive tabs, and the tabs used to draw out the negative electrodes of the bare cells are negative tabs. A bare cell includes at least one positive electrode tab and at least one negative electrode tab. The positive electrode tab can be connected to the current collector of the positive electrode sheet in the bare cell by welding, or can be directly extended from the current collector of the positive electrode sheet. Similarly, the negative electrode tab can be connected to the current collector of the negative electrode piece in the bare cell by welding, or can be directly extended from the current collector of the negative electrode piece. The positive tabs are usually aluminum strips. The negative tab is usually a nickel ribbon. Specifically, the structural forms of the positive electrode tabs and the negative electrode tabs will be described in detail in combination with the accompanying drawings in the following embodiments, and will not be repeated here. In order to avoid a short circuit between the tab and the metal layer in the shell (such as the aluminum layer in the aluminum-plastic film), usually the part of the tab that passes through the shell is covered with tab glue to provide insulation and isolation. effect.

Cell: The structure obtained by packaging the bare cell with the shell and injecting the electrolyte is the cell.

Protection board: It is usually a circuit board integrated with a sampling resistor and a current fuse, which is used to avoid overcharge, overdischarge, overcurrent, short circuit and ultra-high temperature charge and discharge of the battery.

Battery packaging: The process of combining cells, protective plates and other accessories to make a complete battery.

The present application provides an electronic device. The electronic device is a type of electronic device that includes a battery. Specifically, the electronic device includes, but is not limited to, a mobile phone, a tablet personal computer, a laptop computer, a personal digital assistant (PDA), a personal computer, a notebook computer (Notebook), a vehicle Electronic devices such as devices and wearables.

Please refer to FIGS. 1 and 2 . FIG. 1 is a perspective view of an electronic device 100 according to some embodiments of the present application, and FIG. 2 is an exploded view of the electronic device 100 shown in FIG. 1 . In this embodiment, the electronic device 100 is a mobile phone. Specifically, the electronic device 100 includes a housing 10 , an electrical device, a charging management module, a power management module and a battery 20 .

It can be understood that, FIG. 1 and FIG. 2 and the following related drawings only schematically show some components included in the electronic device 100, and the actual shape, actual size, actual position and actual structure of these components are not affected by FIG. 1 and FIG. 1 . 2 and the accompanying drawings below. In addition, in order to facilitate the description of the following embodiments, an XYZ coordinate system is established. Specifically, the width direction of the electronic device 100 is defined as the X-axis direction, the length direction of the electronic device 100 is defined as the Y-axis direction, and the thickness direction of the electronic device 100 is defined as the Z-axis direction. It can be understood that the coordinate system setting of the electronic device 100 can be flexibly set according to actual needs, which is not specifically limited here.

The housing 10 includes a light-transmitting cover plate 11 , a back cover 12 and a frame 13 . The material of the transparent cover plate 11 includes but is not limited to glass and plastic. The transparent cover plate 11 and the back cover 12 are stacked and arranged at intervals. The materials of the frame 13 and the back cover 12 include but are not limited to metal and plastic. The frame 13 is located between the transparent cover 11 and the back cover 12 , and the frame 13 is fixed on the back cover 12 . Exemplarily, the frame 13 may be fixedly connected to the back cover 12 by adhesive. The frame 13 can also be integrally formed with the back cover 12 , that is, the frame 13 and the back cover 12 are an integral structure. The transparent cover plate 11 is fixed on the frame 13 . In some embodiments, the transparent cover 11 can be fixed on the frame 13 by gluing. The light-transmitting cover plate 11 , the back cover 12 and the frame 13 enclose an internal accommodating space of the electronic device 100 . The inner accommodating space accommodates the electrical device, the charging management module, the power management module and the battery 20 .

The casing 10 is provided with a battery compartment 30 . The battery compartment 30 is used to accommodate the battery 20 . In some embodiments, referring to FIG. 2 , the electronic device 100 further includes a middle board 40 . The middle plate 40 is located in the inner accommodating space of the electronic device 100 and is fixed to the inner surface of the frame 13 for a circumference. For example, the middle plate 40 may be fixed on the frame 13 by welding, or may be integrally formed with the frame 13 . The middle board 40 is used as a support "skeleton" in the electronic device 100 for supporting the camera module 60 (see FIG. 2 ), the main board, the sub board, the speaker module and other devices. The material of the middle plate 40 includes but is not limited to metal and plastic. In order to ensure the support performance of the middle plate 40, optionally, the material of the middle plate 40 is metal, and specifically, the metal includes but not limited to stainless steel, magnesium-aluminum alloy, aluminum alloy, and the like. The battery compartment 30 is a groove provided on the surface of the middle plate 40 facing the back cover 12 . In other embodiments, the middle plate 40 constitutes the bottom wall of the battery compartment, and the accommodation space between the middle plate 40 and the back cover 12 is provided with electronic components such as a main board, a speaker module, and a sub-board. These electronic components The opposite two side walls of the battery compartment 30 arranged in the Y-axis direction are formed, and the two sides of the frame 13 extending along the Y-axis direction respectively form the other opposite two side walls of the battery compartment 30 arranged in the X-axis direction. In still other embodiments, the middle plate 40 may not be provided in the electronic device 100, and the display screen 50 in FIG. 2 is used to form the bottom wall of the battery compartment 30, and the main board, the speaker module, the sub-board, and the frame 13 form the battery compartment. 30 side walls. There is no specific limitation here.

The battery 20 is installed in the battery compartment 30 , and the battery 20 is used to provide power to the electrical devices in the electronic device 100 . Specifically, the electrical device includes but is not limited to one or more of the display screen 50 (see FIG. 2 ), the camera module 60 , the main board, the sub-board, the speaker module, and the fingerprint identification module, which are not described here. Specific restrictions.

The power management module is electrically connected between the battery 20 and the electrical device. The power management module is used to receive the input of the battery 20 and discharge the electrical device to supply power to the electrical device. The power management module can also be used to monitor parameters such as the capacity of the battery 20, the number of charge and discharge cycles, and the state of health (leakage, impedance).

The charging management module is electrically connected between the charger and the battery 20 . The charge management module is used to receive charge input from the charger. The charger can be a wireless charger or a wired charger. In some wired charging embodiments, the charging management module may receive the charging input of the wired charger through a universal serial bus (USB) interface. In some wireless charging embodiments, the charging management module may receive wireless charging input through a wireless charging coil of the electronic device. The power management module and the charging management module can be integrated into one body, or can be set separately, which is not specifically limited here.

Please refer to FIGS. 3 and 4 , FIG. 3 is a perspective view of the battery 20 provided by some embodiments of the present application, and FIG. 4 is an exploded view of the battery 20 shown in FIG. 3 . In this embodiment, the battery 20 is a lithium-ion battery. The battery 20 includes a battery cell 21 and a protection plate 22 .

Please refer to FIG. 5 , which is an exploded view of the cells 21 in the battery 20 shown in FIG. 4 . The cell 21 includes a casing 211 and a bare cell 212 .

The casing 211 is encapsulated with an electrolyte solution. The bare cell 212 is located in the casing 211 and soaked in the electrolyte. The bare cell 212 has two tabs 213 . One of the two tabs 213 is a positive tab, and the other is a negative tab. One end of the tab 213 is electrically connected to the bare cell 212 , and the other end of the tab 213 extends out of the housing 211 through the casing 211 . Referring back to FIG. 4 , the protection plate 22 is disposed outside the casing 211 , and the protection plate 22 is electrically connected to the portion of the tab 213 located outside the casing 211 . The protection plate 22 has a charge and discharge port D, and the charge and discharge port D has a positive electrode terminal and a negative electrode terminal. The positive terminal is in communication with the positive tab, and the negative terminal is in communication with the negative tab. The charge and discharge port D is electrically connected to the aforementioned power management module, charge management module, and charger through the positive terminal and the negative terminal, so as to realize charge and discharge management and detection of parameters such as capacity, cycle times, and state of health.

The battery 20 shown in FIG. 3 to FIG. 5 only includes a single cell, and the single cell can only charge and discharge the battery 20 through the two tabs 213 . The charge and discharge link is single, and the cell impedance is large, which cannot withstand large currents. charging, so the charging speed is low and fast charging cannot be achieved. On the other hand, since the battery 20 shown in FIGS. 3 to 5 has a single charge-discharge link and a large cell impedance, the overall temperature rise of the battery 20 during the charge and discharge process is large, and the thermal safety performance of the battery is low.

To solve the above problem, a feasible design idea is to set at least two bare cells in the battery 20 without increasing the volume of the battery 20 . Here, "at least two" means two or more. Each bare cell has at least one positive tab and one negative tab. By means of the at least two bare cells and the positive electrode tab and the negative electrode tab of each bare cell, at least two charge-discharge links can be formed. By means of the at least two charge and discharge links, at least two parts of the battery 20 can be charged and discharged at the same time, the cell impedance is small, the charge and discharge speed can be improved, and the thermal safety performance can be ensured.

For example, please refer to FIG. 6 and FIG. 7 , FIG. 6 is a schematic structural diagram of a battery 20 provided by some embodiments of the present application, and FIG. 7 is an exploded view of the battery 20 shown in FIG. 6 . In this embodiment, the battery 20 includes a battery cell 21 and a protection plate 22 . The cell 21 includes a casing 211, a first bare cell 212a and a second bare cell 212b.

The casing 211 is encapsulated with an electrolyte solution. The first bare cell 212a and the second bare cell 212b are both disposed in the casing 211 and soaked in the electrolyte. The first bare cell 212a and the second bare cell 212b may be wound bare cells, or may be stacked bare cells. The shape of the first bare cell 212a and the second bare cell 212b may be a rectangular parallelepiped, a cube, a cylinder or other special shapes.

The first bare cell 212a has two first tabs 213a. One of the two first tabs 213a is a positive tab and the other is a negative tab. One end of the two first tabs 213a is electrically connected to the first bare cell 212a, and the other end extends through the first casing 211a to the outside of the first casing 211a. The two first tabs 213a form the first charging and discharging ports B. Similarly, the second bare cell 212b has two second tabs 213b. One of the two second tabs 213b is a positive tab and the other is a negative tab. One end of the two second tabs 213b is electrically connected to the second bare cell 212b, and the other end extends through the second casing 211b to the outside of the second casing 211b. The two second tabs 213b form the second charging and discharging ports C.

The protection plate 22 has a first charge and discharge circuit and a second charge and discharge circuit. The first charge-discharge circuit and the second charge-discharge circuit are integrated on the protection plate 22, which is not shown in the figure. The first charging and discharging circuit is electrically connected to the first bare cell 212a through the first charging and discharging port B. As shown in FIG. On this basis, the protection board 22 also has a third charging and discharging port D. The third charging and discharging port D is located on the first charging and discharging circuit. The protection board 22 is used for being electrically connected with the power management module, the charging management module and the charger by means of the third charging and discharging port D, so as to form a charging and discharging link. Similarly, the second charging and discharging circuit is electrically connected to the second bare cell 212b through the second charging and discharging port C. On this basis, the protection board 22 also has a fourth charging and discharging port E, and the fourth charging and discharging port E is located on the second charging and discharging circuit. The protection board 22 is used for being electrically connected with the power management module, the charging management module and the charger by means of the fourth charging and discharging port E, so as to form another charging and discharging link.

Compared with the battery 20 shown in FIG. 3 to FIG. 5 , the battery 20 shown in FIGS. 6 and 7 adds a bare cell, thereby adding a charge and discharge chain, which can realize multi-channel charge and discharge, compared with a single charge and discharge chain. It can improve the charging efficiency and ensure the thermal safety performance to a certain extent. However, while adding a bare cell, at least two tabs (including a positive tab and a negative tab) are also added. The tabs are only used to draw out the electrodes of the bare cell, and are not used to participate in the charge-discharge reaction. Therefore, the volume energy density of the battery 20 is reduced on the premise that the volume of the battery 20 remains unchanged. It can be seen from this that it is often difficult for the battery 20 to take into account both the charge-discharge speed and the volumetric energy density.

In order to overcome the above-mentioned technical difficulties, the first improvement idea provided by the present application is to set at least two bare cells in the battery, and combine a type of pole piece (a positive pole piece or a negative pole piece) of one of the bare cells to collect the The fluid is electrically connected to a current collector of a pole piece (a positive pole piece or a negative pole piece) of another bare cell, so that one tab can be used to draw out the electrodes of these two pole pieces at the same time. In addition, the present application also provides a second improvement idea, the second improvement idea is to set at least two bare cells in the battery, and set an extra tab between two adjacent bare cells, the extra pole The ears are electrically connected simultaneously with the current collector of a pole piece (a positive pole piece or a negative pole piece) of the two bare cells. As a result, one electrode tab can be used to simultaneously lead out the electrodes of one type of pole piece of the two bare cells. Both of these two design ideas can improve the charging and discharging speed of the battery while reducing the number of tabs, so that the charging and discharging speed and volumetric energy density of the battery can be taken into account to a certain extent. Furthermore, the present application also provides a third improvement idea. The third improvement idea is to set at least two bare cells in the battery, and a current collector of a pole piece of each bare cell extends to form a tab unit. , the tab units of the at least two bare cells lead out electrodes through the same transfer conductor. According to these three design ideas, the structure of the battery 20 provided by the present application may include the following first embodiment, second embodiment and third embodiment. Specifically, the following embodiment 1 is based on the above-mentioned first design idea, the following embodiment 2 is based on the above-mentioned second design idea, and the following embodiment 3 is based on the above-mentioned third design idea.

Example 1

Please refer to FIGS. 8 and 9 , FIG. 8 is a schematic structural diagram of a battery 20 according to further embodiments of the present application, and FIG. 9 is an exploded view of the battery 20 shown in FIG. 8 . In this embodiment, the battery 20 includes a battery cell 21 and a protection plate 22 . The cell 21 includes a casing 211, a first bare cell 212a and a second bare cell 212b.

An electrolyte solution (not shown in the figure) is encapsulated in the casing 211 . The first bare cell 212a and the second bare cell 212b are both disposed in the casing 211 and soaked in the electrolyte.

The shape of the first bare cell 212a and the second bare cell 212b may be a rectangular parallelepiped, a cube, a cylinder or other special shapes. The drawings in the present application are all described on the basis that the first bare cell 212a and the second bare cell 212b are rectangular parallelepipeds. On this basis, the first bare cell 212a and the second bare cell 212b may be arranged in layers, may also be arranged side by side, or may have other relative positional relationships.

The first bare cell 212a and the second bare cell 212b may be wound bare cells, or may be stacked bare cells. FIGS. 8 and 9 only show an example in which the first bare cell 212a and the second bare cell 212b are wound bare cells. In other embodiments, the first bare cell 212a and the second bare cell 212b are both stacked bare cells. In still other embodiments, one of the first bare cell 212a and the second bare cell 212b may be a wound bare cell, and the other is a stacked bare cell.

Please refer to FIG. 10 . FIG. 10 is a schematic view of the end surface structure of the first bare cell 212 a in the battery 20 shown in FIG. 9 . The first bare cell 212a is formed by stacking the second pole piece P2, the separator S, the first pole piece P1, and the separator S in sequence and then winding. One of the first pole piece P1 and the second pole piece P2 is a positive pole piece and the other is a negative pole piece. Please refer to FIG. 11 . FIG. 11 is a schematic cross-sectional structure diagram of a portion of the first bare cell 212 a shown in FIG. 10 along the a-a direction. The first pole piece P1 includes a current collector P11 and a polar material P12 disposed on the surface of the current collector P11. The polar material P12 may be disposed on one surface of the current collector P11, or may be disposed on two opposite surfaces of the current collector P11. FIG. 11 illustrates that the polar material P12 is disposed on one surface of the current collector P11 as an example. Please continue to refer to FIG. 11 , the second pole piece P2 includes a current collector P21 and a polar material P22 disposed on the surface of the current collector P21 . The polar material P22 may be provided on one surface of the current collector P21, or may be provided on two opposite surfaces of the current collector P21. FIG. 11 illustrates an example in which the polar material P22 is provided on one surface of the current collector P21.

Please refer to FIG. 10 and FIG. 11 together, the first bare cell 212a further includes a first tab 213a. The first tab 213 a is electrically connected to the current collector P11 of the first pole piece P1 , and is used to lead the electrode of the first pole piece P1 out of the casing 211 .

For the first bare cells 212a with different structural forms, the structures of the first tabs 213a are also different.

Specifically, when the first bare cell 212a is a wound bare cell, in some embodiments, please refer to FIGS. 12 and 13 , and FIG. 12 is the first pole piece in the first bare cell 212a shown in FIG. 10 . A schematic structural diagram of P1 in the unfolded state, and FIG. 13 is another structural schematic diagram of the first pole piece P1 in the unfolded state of the first bare cell 212a shown in FIG. 10 . In the embodiments shown in FIGS. 12 and 13 , the first tab 213a is independent of the first pole piece P1, and the first tab 213a is fixed to the current collector of the first pole piece P1 by pressing, welding, etc. on P11. The difference between the embodiment shown in FIG. 12 and the embodiment shown in FIG. 13 is that in FIG. 12 one end of the first tab 213a is orthographically projected on the first pole piece P1 outside the first pole piece P1, and the first pole tab is located outside the first pole piece P1. The volume of 213a is small, and the space occupied in the battery 20 is small, which is beneficial to improve the volume energy density of the battery 20; In this way, the first tab 213a can be connected to more charging and discharging links, so as to improve the charging and discharging speed of the battery 20 . Specifically, the first tab 213a can be selected from the edge of the first pole piece P1 at one end or the edge of the first pole piece P1 at both ends according to the actual volume energy density or charge and discharge speed requirements.

In other embodiments, please refer to FIG. 14 . FIG. 14 is another schematic structural diagram of the first pole piece P1 in the unfolded state of the first bare cell 212 a shown in FIG. 10 . In this embodiment, the current collector P11 of the first pole piece P1 and the polar material P12 of the first pole piece P1 are arranged to overlap, and the current collector P11 of the first pole piece P1 is completely covered by the polar material P12 of the first pole piece P1 shading, so the current collector P11 of the first pole piece P1 is not shown in FIG. 14 . On this basis, the first tab 213a includes a tab unit 213a1 formed by directly extending the current collector P11 of the first pole piece P1. That is, the tab unit 213a1 and the current collector P11 of the first pole piece P1 are integrated as a structural member. Based on this, the first tab 213a further includes a transfer conductor (not shown in the figure) that is electrically connected to the tab unit 213a1. The structural strength of the transfer conductor may be greater than that of the tab unit 213a1. Therefore, the first tab A tab 213a leads out the electrode through the transfer conductor and is connected to the protection board 22, which has better reliability.

It should be noted that, FIGS. 12 to 14 only show an example of a single structure of the first tab 213a when the first bare cell 212a is a wound bare cell, and the structure of the first tab 213a does not limited to this. In some other embodiments, when the first bare cell 212a is a wound bare cell, the first tab 213a may further include a plurality of tab units, and the plurality of tab units are arranged at intervals on the first pole piece on the current collector P11 of P1. When the first pole piece P1, the separator S, and the second pole piece P2 are stacked and wound to form a bare cell, the plurality of tab units are stacked to facilitate fixing to form the first tab 213a. The plurality of tab units may be fixed on the current collector P11 of the first pole piece P1 by welding, pressing, or the like, or may be formed by directly extending the current collector P11 , which is not specifically limited herein.

For example, please refer to FIG. 15 , which is a schematic diagram of a connection structure of the first pole piece P1 and the first tab 213a in the unfolded state of the first bare cell 212a according to further embodiments of the present application. The first tab 213a includes a plurality of tab units 213a1. The plurality of tab units 213a1 are fixed on the current collector P11 of the first pole piece P1 at intervals by welding, pressing and other processes. The plurality of tab units 213a1 may protrude from the first pole piece P1 at one end, or extend out of the first pole piece P1 at both ends. FIG. 15 only shows that one end of the plurality of tab units 213a1 extends out of the first pole piece P1. Example. When the first pole piece P1, the separator S, and the second pole piece P2 are stacked and wound to form a bare cell, please refer to FIG. 16. FIG. 16 shows the first pole piece P1, the separator S, and the second pole piece shown in FIG. 15. A schematic diagram of the structure after the sheets P2 are stacked and wound to form the first bare cell 212a. In this embodiment, a plurality of tab units 213a1 are stacked and arranged so as to be fixed together by welding, pressing and other processes to form the first tabs 213a.

For another example, please refer to FIG. 17 , which is a schematic diagram of a connection structure of the first pole piece P1 in the first bare cell 212a in the unfolded state and the first tab 213a according to further embodiments of the present application. In this embodiment, the current collector P11 of the first pole piece P1 and the polar material P12 of the first pole piece P1 are arranged to overlap, and the current collector P11 of the first pole piece P1 is completely covered by the polar material P12 of the first pole piece P1 shading, so the current collector P11 of the first pole piece P1 is not shown in FIG. 14 . On this basis, the first tab 213a includes a plurality of tab units 213a1 and a transition conductor (not shown in the figure). The plurality of tab units 213a1 are formed by directly extending the current collector P11 of the first pole piece P1. That is, the plurality of tab units 213a1 and the current collector P11 of the first pole piece P1 are integrated as a structural member. When the first pole piece P1, the separator S and the second pole piece P2 are stacked and wound to form the first bare cell 212a, a plurality of tab units 213a1 are stacked and electrically connected with the transfer conductors to form The first tab 213a.

When the first bare cell 212a is a stacked bare cell, in some embodiments, please refer to FIG. 18 and FIG. 19 . FIG. 18 is a schematic structural diagram of the first bare cell 212a according to further embodiments of the present application. FIG. 19 is a schematic cross-sectional structure diagram of the first bare cell 212a at the b-b line shown in FIG. 18 . In this embodiment, the first bare cell 212a is a laminated bare cell. The first bare cell 212a includes a first pole piece P1 and a second pole piece P2 which are alternately arranged in sequence and stacked together, and a diaphragm S is provided between the adjacent first pole pieces P1 and the second pole pieces P2. The first pole piece P1 includes a current collector P11 and a polar material P12. The polar material P12 may be provided on one surface of the current collector P11, or may be provided on two opposite surfaces of the current collector P11. FIG. 19 only shows an example in which the polar material P12 is provided on one surface of the current collector P11. The second pole piece P2 includes a current collector P21 and a polar material P22. The polar material P22 may be provided on one surface of the current collector P21, or may be provided on two opposite surfaces of the current collector P21. FIG. 19 only shows an example in which the polar material P22 is disposed on one surface of the current collector P21 , which should not be considered as a special limitation to the present application. On this basis, the first pole tab 213a is used to draw out the current of the first pole piece P1. Specifically, the first tab 213a includes a plurality of tab units 213a1. The plurality of tab units 213a1 are respectively electrically connected to the current collectors P11 of the plurality of first pole pieces P1 of the first bare cell 212a, or are directly formed by extending the current collectors P11 of the plurality of first pole pieces P1. In the embodiment shown in FIG. 19 , the plurality of tab units 213a1 are independent of the plurality of first pole pieces P1, and the plurality of tab units 213a1 are respectively electrically connected to the plurality of first poles by welding, pressing and other processes. on the current collector P11 of the sheet P1. In some other embodiments, please refer to FIG. 20 . FIG. 20 is another schematic cross-sectional structure diagram of the first bare cell 212 a shown in FIG. 18 at line b-b. In this embodiment, the plurality of tab units 213a1 are respectively formed by directly extending the current collectors P11 of the plurality of first pole pieces P1. On the basis of the embodiment shown in FIG. 20 , the first tab 213a further includes a transfer conductor, and a plurality of tab units 213a1 are stacked and electrically connected with the transfer conductor to form the first tab 213a.

Please refer to FIG. 21 . FIG. 21 is a schematic view of the end surface structure of the second bare cell 212 b in the battery 20 shown in FIG. 9 . The second bare cell 212b is formed by stacking and winding four layers of materials including the fourth pole piece P4, the separator S, the third pole piece P3, and the separator S. One of the third pole piece P3 and the fourth pole piece P4 is a positive pole piece and the other is a negative pole piece. Please refer to FIG. 22 . FIG. 22 is a schematic cross-sectional structure diagram of a part of the second bare cell 212 b shown in FIG. 21 along the c-c direction. The third pole piece P3 includes a current collector P31 and a polar material P32 disposed on the surface of the current collector P31. The polar material P32 may be disposed on one surface of the current collector P31, or may be disposed on two opposite surfaces of the current collector P31. FIG. 22 illustrates an example in which the polar material P32 is disposed on one surface of the current collector P31. Please continue to refer to FIG. 22 , the fourth pole piece P4 includes a current collector P41 and a polar material P42 disposed on the surface of the current collector P41 . The polar material P42 may be provided on one surface of the current collector P41, or may be provided on two opposite surfaces of the current collector P41. FIG. 22 is an introduction by taking an example that the polar material P42 is disposed on one surface of the current collector P41.

Please refer to FIG. 21 and FIG. 22 together, the second bare cell 212b further includes a second tab 213b. The second tab 213b is electrically connected to the current collector P31 of the third pole piece P3 , and is used to lead the electrode of the third pole piece P3 out of the casing 211 .

For the second bare cells 212b with different structural forms, the structures of the second tabs 213b are also different. Specifically, the structural design of the second tab 213b under the second bare cell 212b with different structural forms can be implemented with reference to the structure of the first tab 213a under the first bare cell 212a with different structural forms, and is not described here. Do repeat.

In combination with the first bare cell 212a and the second bare cell 212b described in the above embodiments, the current collector P21 of the second pole piece P2 in the first bare cell 212a and the fourth pole piece P4 in the second bare cell 212b The current collector P41 is electrically connected as a whole. Specifically, the current collector P21 of the second pole piece P2 in the first bare cell 212a and the current collector P41 of the fourth pole piece P4 in the second bare cell 212b may be electrically connected through contact, electrical conduction, welding, or integral molding. into a whole. In this way, the space occupied by the electrical connection portion between the first bare cell 212 a and the second bare cell 212 b is small, which is beneficial to improve the volumetric energy density of the battery 20 .

For example, please refer to FIGS. 23 and 24. FIG. 23 is a schematic diagram of a connection structure of the first bare cell 212a shown in FIG. 10 and the second bare cell 212b shown in FIG. 21, and FIG. 24 is the structure shown in FIG. 23. Schematic diagram of the cross-sectional structure at line d-d. In this embodiment, the current collector P21 of the second pole piece P2 in the first bare cell 212a and the current collector P41 of the fourth pole piece P4 in the second bare cell 212b are electrically connected to form a whole through contact and electrical conduction . In order to ensure the contact stability between the current collector P21 of the second pole piece P2 in the first bare cell 212a and the current collector P41 of the fourth pole piece P4 in the second bare cell 212b, the second pole The contact parts of the current collector P21 of the sheet P2 and the current collector P41 of the fourth pole piece P4 are pressed into a whole, and the first bare cell 212a and the second bare cell 212b can also be fixed together by tab glue.

For another example, please refer to FIG. 25 . FIG. 25 is a schematic diagram of another connection structure of the first bare cell 212 a shown in FIG. 10 and the second bare cell 212 b shown in FIG. 21 . In this embodiment, the current collector of the second pole piece P2 in the first bare cell 212a and the current collector of the fourth pole piece P4 in the second bare cell 212b are electrically connected as a whole by welding. The solder joint number is 215.

For another example, please refer to FIG. 26 , which is a schematic diagram of still another connection structure of the first bare cell 212a shown in FIG. 10 and the second bare cell 212b shown in FIG. 21 . In this embodiment, the current collector of the second pole piece P2 in the first bare cell 212a and the current collector of the fourth pole piece P4 in the second bare cell 212b are electrically connected as a whole by integral molding. That is to say, the current collector of the second pole piece P2 and the current collector of the fourth pole piece P4 are integrated as a structural member.

On this basis, the battery 20 further includes a third tab 214 . The third tab 214 is electrically connected to the above-mentioned whole (that is, the whole formed by the electrical connection between the current collector of the second pole piece P2 and the current collector of the fourth pole piece P4 ), so as to draw out the second pole piece P2 and the third pole piece P4 at the same time. The electrode of the quadrupole sheet P4. Specifically, the third tab 214 can be electrically connected to a part of the current collectors belonging to the second pole piece P2 in the whole, or to a part of the current collectors belonging to the fourth pole piece P4 in the whole. The third tab 214 may also be located between the second pole piece P2 and the fourth tab P3. On this basis, the third tab 214 is electrically connected not only to the part of the current collectors belonging to the second pole piece P2 in the above-mentioned whole, but also to the part of the current collectors belonging to the fourth pole piece P4 in the above-mentioned whole.

Figures 23, 25 and 26 give examples where the third tab 214 is electrically connected to a part of the current collector in the whole belonging to the second pole piece P2. On the basis of this example, optionally, the third tab 214 can be electrically connected to the current collector of the second pole piece P2 by welding, pressing, etc., or can be directly extended from the current collector of the second pole piece P2 form. There is no specific limitation here. Specifically, the third pole tab 214 may be electrically connected to a portion of the second pole piece P2 close to the fourth pole piece P4. In this way, the distance from the third tab 214 to each part on the fourth pole piece P4 can be shortened, so that the impedance can be reduced to a certain extent and the charging and discharging speed can be increased.

In still other embodiments, the third tab 214 is electrically connected to a part of the current collector belonging to the fourth pole piece P4 in the whole. On the basis of this embodiment, optionally, the third tab 214 can be electrically connected to the current collector of the fourth pole piece P4 by welding, pressing, etc., or can be directly connected by the current collector of the fourth pole piece P4 extended formation. There is no specific limitation here. Specifically, the third pole tab 214 may be electrically connected to a portion of the fourth pole piece P4 close to the second pole piece P2. In this way, the distance from the third tab 214 to each part on the second pole piece P2 can be shortened, so that the impedance can be reduced to a certain extent and the charging and discharging speed can be increased.

In still other embodiments, please refer to FIG. 27 and FIG. 28 , FIG. 27 is a schematic diagram of the connection structure of the first bare cell 212 a and the second bare cell 212 b provided by still other embodiments of the present application, and FIG. 28 is the connection structure shown in FIG. 27 . The schematic diagram of the cross-sectional structure of the structure at the e-e line. In this embodiment, the third tab 214 is located between the second pole piece P2 and the fourth pole tab P3, and the third tab 214 is electrically connected to a part of the current collector belonging to the second pole piece P2 in the whole, It is also electrically connected to the part of the current collector belonging to the fourth pole piece P4 in the whole. Optionally, the third tab 214 may be electrically connected to the part of the current collectors belonging to the second pole piece P2 and the part of the current collectors belonging to the fourth pole piece P4 in the whole by welding, pressing and other processes.

One ends of the first tab 213 a , the second tab 213 b and the third tab 214 protrude out of the housing 211 through the casing 211 .

In this way, the first tab 213a and the third tab 214 of the battery 20 form the first charge and discharge port B, and the second tab 213b and the third tab 214 of the battery 20 form the second charge and discharge port C. At least two charge-discharge links can be formed by the first charge-discharge port B and the second charge-discharge port C, thereby increasing the charge-discharge speed of the battery 20 . Meanwhile, since the first charge and discharge port B and the second charge and discharge port C share the third tab 214 , the number of tabs in the battery 20 can be reduced to ensure the volumetric energy density of the battery 20 . Therefore, to a certain extent, both the charging and discharging speed and the volume energy density of the battery 20 are taken into consideration. At the same time, since the number of tabs in the battery 20 is relatively small, under the premise of a certain size of the battery 20, a single tab (including the first tab 213a, the second tab 213b and the third tab 214) can be Widened in width to further improve charging capability and optimize heat dissipation.

It should be noted that, in the above embodiment, the number of the third tabs 214 may be one or more. 23-28 only show an example in which the number of the third tabs 214 is one. As the number of the third tabs 214 increases, the number of charge-discharge links formed by the battery 20 also increases, and the charge-discharge speed of the battery 20 also increases. However, as the number of the third tabs 214 increases, the volume occupied by the tabs in the battery 20 increases. On the premise that the volume of the battery 20 is constant, the volumetric energy density of the battery 20 decreases. Therefore, the number of the third tabs 214 can be designed according to the requirements of the charging and discharging speed and volumetric energy density in a specific scenario.

When the number of the third tabs 214 is plural, the plurality of third tabs 214 may all be disposed on the part of the current collectors belonging to the second pole piece P2 in the above-mentioned whole, or may be all disposed on the part of the above-mentioned whole that belong to the second pole piece P2 On the part of the current collector of the quadrupole piece P4, part of the third tab 214 may be arranged on the part of the current collector belonging to the second pole piece P2 in the above-mentioned whole, and the other part is arranged on the part of the above-mentioned whole that belongs to the fourth pole piece P4 on the collector.

For example, please refer to FIG. 29 . FIG. 29 is a schematic diagram of the connection structure of the first bare cell 212 a and the second bare cell 212 b according to further embodiments of the present application. In this embodiment, the number of the third tabs 214 is two, and the two third tabs 214 are both electrically connected to the part of the current collectors belonging to the second pole piece P2 in the whole. The two third tabs 214 and the first tabs 213a respectively form first charging and discharging ports B, thereby obtaining two first charging and discharging ports B. As shown in FIG. The two third tabs 214 and the second tabs 213b respectively form second charging and discharging ports C, thereby obtaining two second charging and discharging ports C. Thereby, four charge-discharge links can be formed, so that the charge-discharge speed of the battery 20 can be improved to a certain extent.

It should be noted that, the above-mentioned connection structure of the first bare cell 212a and the second bare cell 212b is performed only on the basis that the first bare cell 212a and the second bare cell 212b are wound bare cells instruction of. Of course, the first bare cell 212a and the second bare cell 212b may also be stacked bare cells. Based on this, the first bare cell 212a includes a plurality of second pole pieces P2, and the second bare cell 212b includes a plurality of fourth pole pieces P4. The current collector P21 of the second pole piece P2 in the first bare cell 212a and the current collector P41 of the fourth pole piece P4 in the second bare cell 212b are electrically connected as a whole, which means that at least one of the first bare cell 212a is electrically connected. The current collector P21 of one second pole piece P2 and the current collector P41 of at least one fourth pole piece P4 in the second bare cell 212b are electrically connected as a whole.

Specifically, the current collector P21 of at least one second pole piece P2 in the first bare cell 212a is electrically connected to the current collector P41 of at least one fourth pole piece P4 in the second bare cell 212b as a whole, including: a first A current collector P21 of a second pole piece P2 in the bare cell 212a is electrically connected to a current collector P41 of a fourth pole piece P4 in the second bare cell 212b as a whole; a second pole of the first bare cell 212a The current collector P21 of the sheet P2 is electrically connected to the current collector P41 of the plurality of fourth pole pieces P4 in the second bare cell 212b as a whole; the current collector P21 of the plurality of second pole pieces P2 in the first bare cell 212a is electrically connected to The current collector P41 of a fourth pole piece P4 in the second bare cell 212b is electrically connected as a whole; the current collectors P21 of the plurality of second pole pieces P2 in the first bare cell 212a and the second bare cell 212b are many The current collectors P41 of the fourth pole pieces P4 are respectively electrically connected to form a whole; four meanings.

For example, please refer to FIG. 30 , which is a schematic diagram of the connection structure of the first bare cell 212 a and the second bare cell 212 b according to further embodiments of the present application. In this embodiment, the first bare cell 212a and the second bare cell 212b are both stacked bare cells. The first bare cell 212a and the second bare cell 212b are stacked. The surface of the first bare cell 212a close to the second bare cell 212b is formed by the current collector of the second pole piece P2. The surface of the second bare cell 212b close to the first bare cell 212a is formed by the current collector of the fourth pole piece P4. The current collector of the second pole piece P2 of the first bare cell 212a is electrically connected to the current collector of the fourth pole piece P4 of the second bare cell 212b as a whole. Specifically, the current collector of the second pole piece P2 and the current collector of the fourth pole piece P4 can be electrically connected into a whole by means of contact and electrical conduction, welding, integral molding, and the like. On this basis, the third tab 214 is electrically connected to the whole. Specifically, the third tab 214 may be electrically connected to a part of the current collector belonging to the second pole piece P2 in the whole, or to a part of the current collector belonging to the fourth pole piece P4 in the whole, or It is located between the second pole piece P2 and the fourth pole piece P4, and is not only electrically connected to the part of the current collector that belongs to the second pole piece P2 in the above-mentioned whole, but also is electrically connected to the part of the current collector that belongs to the fourth pole piece P4 in the above-mentioned whole. part of the current collector.

In the above-mentioned embodiment, when the third tab 214 is electrically connected to a part of the current collector belonging to the second pole piece P2 or a part of the current collector belonging to the fourth pole piece P4 in the whole, specifically, the third pole The lugs 214 can be electrically connected to the partial current collectors belonging to the second pole piece P2 or to the partial current collectors belonging to the fourth pole piece P4 in the whole by welding, pressing, etc. Part of the current collector of P2 or part of the current collector belonging to the fourth pole piece P4 is directly formed by extension. FIG. 30 only shows an example in which the third tab 214 is directly extended from the part of the current collector belonging to the fourth pole piece P4 in the whole. In other examples, please refer to FIG. 31 , which is a schematic diagram of the connection structure of the first bare cell 212 a and the second bare cell 212 b according to further embodiments of the present application. Compared with the embodiment shown in FIG. 30 , the difference of this embodiment is that in this embodiment, the third tab 214 is located in the part of the current collector belonging to the second pole piece P2 and the part of the current collector belonging to the fourth pole piece P4 in the above-mentioned whole. between the partial collectors. And the third pole lug 214 is electrically connected to the partial current collectors belonging to the second pole piece P2 in the above-mentioned whole, and also to the partial current collectors belonging to the fourth pole piece P4 in the above-mentioned whole through welding, pressing, etc. superior.

For another example, please refer to FIG. 32 and FIG. 33 . FIG. 32 is a schematic diagram of the connection structure of the first bare cell 212 a and the second bare cell 212 b provided by further embodiments of the present application, and FIG. 33 is the connection structure shown in FIG. 32 . Schematic diagram of the structure when viewed from direction A. In this embodiment, the first bare cell 212a and the second bare cell 212b are both stacked bare cells. The first bare cell 212a and the second bare cell 212b are arranged side by side. The number of the second pole pieces P2 of the first bare cell 212a is equal to the number of the fourth pole pieces P4 of the second bare cell 212b, and the second pole pieces P2 of the first bare cell 212a and the second bare cell 212b The fourth pole pieces P4 are in one-to-one correspondence, and the current collector of each second pole piece P2 is electrically connected to the corresponding current collector of the fourth pole piece P4 as a whole. Specifically, the current collector of each second pole piece P2 and the corresponding current collector of the fourth pole piece P4 are electrically connected as a whole through direct contact, electrical conduction, welding, integral molding, and the like. In the embodiment shown in FIG. 32 , the current collector of each second pole piece P2 and the corresponding current collector of the fourth pole piece P4 are electrically connected as a whole by integral molding.

On this basis, please continue to refer to FIG. 33 , the third tab 214 includes a plurality of tab units 214a. The plurality of tab units 214a are respectively electrically connected to the above-mentioned plurality of wholes. Specifically, the plurality of tab units 214a may be respectively electrically connected to the parts of the above-mentioned plurality of wholes that belong to the first bare cell 212a, or may be electrically connected to the parts of the above-mentioned plurality of wholes that belong to the second bare cell 212b Part of the above-mentioned multiple wholes may be electrically connected to the part belonging to the first bare cell 212a, and the other part may be electrically connected to the part of the above-mentioned multiple wholes belonging to the second bare cell 212b, which is not specifically limited here. And the plurality of tab units 214a can be electrically connected to the plurality of wholes by welding, pressing, etc., or can be directly extended from the plurality of wholes, that is, the plurality of tab units 214a are respectively connected to the plurality of wholes. The whole is integrally formed. When the plurality of tab units 214a are directly extended from the plurality of whole bodies, the third tab 214 further includes a transfer conductor (not shown in the figure), and the plurality of tab units 214a are stacked and connected with the transfer conductor electrically connected together.

Embodiment 2

Please refer to FIGS. 34 and 35 . FIG. 34 is a schematic structural diagram of a battery 20 according to further embodiments of the present application, and FIG. 35 is an exploded view of the battery 20 shown in FIG. 34 . In this embodiment, the battery 20 includes a battery cell 21 and a protection plate 22. The cell 21 includes a casing 211, a first bare cell 212a and a second bare cell 212b.

The first bare cell 212a and the second bare cell 212b may be wound bare cells, or may be stacked bare cells. FIG. 35 only shows an example in which the first bare cell 212a and the second bare cell 212b are wound bare cells. In other embodiments, the first bare cell 212a and the second bare cell 212b are both stacked bare cells. In still other embodiments, one of the first bare cell 212a and the second bare cell 212b may be a wound bare cell, and the other is a stacked bare cell.

Please refer to FIG. 36 . FIG. 36 is a schematic view of the end surface structure of the first bare cell 212 a in the battery 20 shown in FIG. 35 . The first bare cell 212a includes a first pole piece P1, a second pole piece P2, and a diaphragm S for insulating and isolating the first pole piece P1 and the second pole piece P2. One of the first pole piece P1 and the second pole piece P2 is a positive pole piece and the other is a negative pole piece. On this basis, the first bare cell 212a further includes a first tab 213a. The first tab 213 a is electrically connected to the current collector of the first pole piece P1 , and is used to lead the electrode of the first pole piece P1 out of the casing 211 .

For the first bare cells 212a with different structural forms, the structures of the first tabs 213a are also different. Specifically, for the structure design of the first tab 213a under the first bare cell 212a with different structural forms in this embodiment, reference may be made to the structure design of the first tab 213a under the first bare cell 212a with different structural forms in Embodiment 1 The implementation of the structure is not repeated here.

Please refer to FIG. 37 . FIG. 37 is a schematic diagram of the end surface structure of the second bare cell 212 b in the battery 20 shown in FIG. 35 . The second bare cell 212b includes a third pole piece P3, a fourth pole piece P4, and a separator S for insulating and isolating the third pole piece P3 and the fourth pole piece P4. One of the third pole piece P3 and the fourth pole piece P4 is a positive pole piece and the other is a negative pole piece. On this basis, the second bare cell 212b further includes a second tab 213b. The second tab 213 b is electrically connected to the current collector of the third pole piece P3 , and is used to lead the electrode of the third pole piece P3 out of the casing 211 .

For the second bare cells 212b with different structural forms, the structures of the second tabs 213b are also different. Specifically, for the structure design of the second tab 213b under the second bare cell 212b with different structural forms in this embodiment, reference may also be made to the first tab 213a under the first bare cell 212a with different structural forms in the first embodiment The implementation of the structure will not be repeated here.

On this basis, please refer back to FIG. 35 , the battery 20 further includes a third tab 214 . The third tab 214 is disposed between the current collector of the second pole piece P2 in the first bare cell 212a and the current collector of the fourth pole piece P4 in the second bare cell 212b. The third tab 214 is electrically connected to the current collector of the second pole piece P2, and the third tab 214 is also electrically connected to the current collector of the fourth pole piece P4. That is, the current collector of the second pole piece P2 in the first bare cell 212a is electrically connected to the current collector of the fourth pole piece P4 in the second bare cell 212b via the third tab 214 . Therefore, the third pole tab 214 can also lead out the electrodes of the second pole piece P2 and the fourth pole piece P4 at the same time.

Specifically, please refer to FIG. 38 , which is a schematic diagram of the connection structure of the third tab 214 in FIG. 35 , the first bare cell 212 a shown in FIG. 36 , and the second bare cell 212 b shown in FIG. 37 . In this embodiment, the surface of the first bare cell 212a close to the second bare cell 212b is formed by the current collector of the second pole piece P2. The surface of the second bare cell 212b close to the first bare cell 212a is formed by the current collector of the fourth pole piece P4. The third tab 214 is disposed between the first bare cell 212a and the second bare cell 212b, and the third tab 214 is electrically connected to the first bare cell 212a through contact, welding, pressing, etc. On the current collector of the diode piece P2, the third tab 214 is also electrically connected to the current collector of the fourth pole piece P4 of the second bare cell 212b by means of contact, welding, pressing, or the like.

The connection structure shown in FIG. 38 is similar to the connection structure shown in FIG. 27, except that in the connection structure shown in FIG. 38, the current collector of the second pole piece P2 in the first bare cell 212a only passes through the third pole The ears 214 are electrically connected to the current collector of the fourth pole piece P4 in the second bare cell 212b; and in the connection structure shown in FIG. In addition to the electrical conduction between the tab 214 and the current collector of the fourth pole piece P4 in the second bare cell 212b, it is also directly connected to the current collector of the fourth pole piece P4 in the second bare cell 212b through direct contact, welding, and integral molding. electrical conduction in the same way.

It should be noted that, in the above embodiment, the number of the third tabs 214 may be one or more. FIGS. 35 and 38 only give an example in which the number of the third tabs 214 is one. As the number of the third tabs 214 increases, the number of charge-discharge links formed by the battery 20 also increases, and the charge-discharge speed of the battery 20 also increases. However, as the number of the third tabs 214 increases, the volume occupied by the tabs in the battery 20 increases. On the premise that the volume of the battery 20 is constant, the volumetric energy density of the battery 20 decreases. Therefore, the number of the third tabs 214 can be designed according to the requirements of the charging and discharging speed and volumetric energy density in a specific scenario.

For example, please refer to FIG. 39 , which is a schematic structural diagram of the first bare cell 212 a , the second bare cell 212 b , and the third tab 214 according to further embodiments of the present application. In this embodiment, the number of the third tabs 214 is two, the two third tabs 214 are both disposed between the first bare cell 212a and the second bare cell 212b, and the two third tabs 214 are both electrically connected to the current collector of the second pole piece P2 of the first bare cell 212a, and the two third tabs 214 are also electrically connected to the current collector of the fourth pole piece P4 of the second bare cell 212b superior. The two third tabs 214 and the first tabs 213a respectively form first charging and discharging ports B, thereby obtaining two first charging and discharging ports B. As shown in FIG. The two third tabs 214 and the second tabs 213b respectively form second charging and discharging ports C, thereby obtaining two second charging and discharging ports C. Thereby, four charge-discharge links can be formed, so that the charge-discharge speed of the battery 20 can be improved to a certain extent.

It should be noted that, the above-mentioned connection structure of the first bare cell 212a and the second bare cell 212b is performed only on the basis that the first bare cell 212a and the second bare cell 212b are wound bare cells instruction of. Of course, the first bare cell 212a and the second bare cell 212b may also be stacked bare cells.

For example, please refer to FIG. 40, which is a schematic structural diagram of the first bare cell 212a, the second bare cell 212b, and the third tab 214 according to further embodiments of the present application. In this embodiment, the first bare cell 212a and the second bare cell 212b are both stacked bare cells. The first bare cell 212a and the second bare cell 212b are stacked. The surface of the first bare cell 212a close to the second bare cell 212b is formed by the current collector of the second pole piece P2. The surface of the second bare cell 212b close to the first bare cell 212a is formed by the current collector of the fourth pole piece P4. The third tab 214 is disposed between the first bare cell 212a and the second bare cell 212b, and the third tab 214 is electrically connected to the first bare cell 212a through contact, welding, pressing, etc. On the current collector of the diode piece P2, the third tab 214 is also electrically connected to the current collector of the fourth pole piece P4 of the second bare cell 212b by means of contact, welding, pressing, or the like.

The connection structure shown in FIG. 40 is similar to the connection structure shown in FIG. 31 , except that in the connection structure shown in FIG. 40 , the current collector of the second pole piece P2 of the first bare cell 212 a only passes through the third The tab 214 is electrically connected to the current collector of the fourth pole piece P4 of the second bare cell 212b; and in the connection structure shown in FIG. 31 , the current collector of the second pole piece P2 of the first bare cell 212a is in addition to Through the third tab 214 and the current collector of the fourth pole piece P4 of the second bare cell 212b, in addition to being electrically connected to the current collector of the fourth pole piece P4 of the second bare cell 212b, it is also electrically connected to the first electrode of the second bare cell 212b by means of contact, welding or integral molding. The current collector of the quadrupole sheet P4 is electrically conducted.

Embodiment 3

Please refer to FIGS. 41 and 42 . FIG. 41 is a schematic structural diagram of a battery 20 according to further embodiments of the present application, and FIG. 42 is an exploded view of the battery 20 shown in FIG. 41 . In this embodiment, the battery 20 includes a battery cell 21 and a protection plate 22 . The cell 21 includes a casing 211, a first bare cell 212a and a second bare cell 212b.

The first bare cell 212a and the second bare cell 212b may be wound bare cells, or may be stacked bare cells. FIG. 42 only shows an example in which the first bare cell 212a and the second bare cell 212b are stacked bare cells. In other embodiments, the first bare cell 212a and the second bare cell 212b are both wound bare cells. In still other embodiments, one of the first bare cell 212a and the second bare cell 212b may be a wound bare cell, and the other is a stacked bare cell.

Please refer to FIGS. 43 and 44 , FIG. 43 is a schematic diagram of the connection structure of the first bare cell 212 a and the second bare cell 212 b in the battery 20 shown in FIG. 42 , and FIG. 44 is a cross-section of the structure shown in FIG. 43 at the line f-f Schematic. The first bare cell 212a includes a first pole piece P1, a second pole piece P2, and a diaphragm S for insulating and isolating the first pole piece P1 and the second pole piece P2. One of the first pole piece P1 and the second pole piece P2 is a positive pole piece and the other is a negative pole piece. On this basis, the first bare cell 212a further includes a first tab 213a. The first tab 213 a is electrically connected to the current collector of the first pole piece P1 , and is used to lead the electrode of the first pole piece P1 out of the casing 211 .

The first tab 213a may be independent of the current collector of the first pole piece P1, and be electrically connected to the current collector by welding, pressing, or the like. The first tab 213a may further include a tab unit 213a1 formed by directly extending the current collector of the first pole piece P1. When the first tab 213a includes a tab unit 213a1 formed by directly extending the current collector of the first pole piece P1, the first tab 213a further includes a transfer conductor, and the transfer conductor is electrically connected to the tab unit 213a1, In order to improve the structural strength of the lead-out portion of the first tab 213a, so as to facilitate electrical connection with the protection board.

Please refer to FIG. 45. FIG. 45 is a schematic cross-sectional structure diagram of the structure shown in FIG. 43 at the line g-g. The second bare cell 212b includes a third pole piece P3, a fourth pole piece P4, and a separator S for insulating and isolating the third pole piece P3 and the fourth pole piece P4. One of the third pole piece P3 and the fourth pole piece P4 is a positive pole piece and the other is a negative pole piece. On this basis, the second bare cell 212b further includes a second tab 213b. The second tab 213 b is electrically connected to the current collector of the third pole piece P3 , and is used to lead the electrode of the third pole piece P3 out of the casing 211 .

The second tab 213b may be independent of the current collector of the third pole piece P3, and be electrically connected to the current collector by welding, pressing or the like. The second tab 213b may further include a tab unit 213b1 formed by the direct extension of the current collector of the third pole piece P3. When the second tab 213b includes a tab unit 213b1 formed by directly extending the current collector of the third pole piece P3, the second tab 213b further includes a transfer conductor, and the transfer conductor is electrically connected to the tab unit 213b1, In order to improve the structural strength of the lead-out portion of the second tab 213b, so as to facilitate electrical connection with the protection board.

On this basis, please refer to Fig. 43 and Fig. 46a, Fig. 46a is a schematic cross-sectional structure diagram of the structure shown in Fig. 43 at the line h-h. The battery 20 also includes a third tab 214 . The third tab 214 includes a plurality of tab units 214a and a transition conductor 214b. The plurality of tab units 214a are respectively formed by directly extending the current collectors P21 of the second pole piece P2 and the current collectors P41 of the fourth pole piece P4. The transfer conductor 214b and the plurality of tab units 214a are electrically connected together by welding, pressing or the like. In some embodiments, a plurality of tab units 214a may be stacked to facilitate electrical connection with the transition conductors 214b.

On this basis, optionally, the transition conductor 214b may also extend between the first bare cell 212a and the second bare cell 212b. Please refer to FIG. 46b. FIG. 46b is a schematic diagram of another cross-sectional structure of the structure shown in FIG. 43 at the line h-h. It is assumed that the portion of the transition conductor 214b extending between the first bare cell 212a and the second bare cell 212b is the first portion. The surface of the first bare cell 212a close to the second bare cell 212b is formed by the current collector P21 of the second pole piece P2, and the surface of the second bare cell 212b close to the first bare cell 212a is formed by the fourth pole piece P4 The current collector P41 is formed. The first part is electrically connected to the current collector P21 of the second pole piece P2, and the first part is electrically connected to the current collector P41 of the fourth pole piece P4. In this way, the contact area between the transition conductor 214b and the first bare cell 212a and between the transition conductor 214b and the second bare cell 212b is larger, which can reduce impedance and increase charging and discharging speed.

One end of the first tab 213 a , the second tab 213 b and the transition conductor 214 b protrudes out of the housing 211 through the housing 211 .

In this way, the first tab 213a and the third tab 214 of the battery 20 form the first charge and discharge port B, and the second tab 213b and the third tab 214 of the battery 20 form the second charge and discharge port C. At least two charge-discharge links can be formed by the first charge-discharge port B and the second charge-discharge port C, thereby increasing the charge-discharge speed of the battery 20 . At the same time, since the tab unit 214a formed by the extension of the current collector P21 of the second pole piece P2 and the tab unit 214a formed by the extension of the current collector P41 of the fourth pole piece P4 share the transfer conductor 214b, it is possible to reduce the number of inner poles of the battery 20. The occupied volume of the ear to ensure the volumetric energy density of the battery 20 . Therefore, to a certain extent, both the charge-discharge speed and the volumetric energy density of the battery are taken into account. At the same time, since the number of tabs in the battery is small, under the premise of a certain size of the battery, the width of a single tab (including the first tab 213a, the second tab 213b and the third tab 214) can be increased by wide to further improve charging capacity and optimize heat dissipation.

Compared with the wound bare cell, the laminated bare cell is not limited by the internal structure, and the arrangement position of the tab can be set flexibly. FIG. 43 only shows an example in which the first tab 213a, the second tab 213b and the third tab 214 are disposed on the same side of the composite cell composed of the first bare cell 212a and the second bare cell 212b.

In some other examples, please refer to FIG. 47 , which is a schematic diagram of the connection structure of the first bare cell 212 a and the second bare cell 212 b in the battery 20 according to further embodiments of the present application. In this embodiment, the first tab 213a and the second tab 213b are arranged on one side of the composite cell composed of the first bare cell 212a and the second bare cell 212b, and the third tab 214 is arranged on the composite cell. on the side of the cell adjacent to the side.

In other other embodiments, please refer to FIG. 48 , FIG. 48 is a schematic diagram of the connection structure of the first bare cell 212 a and the second bare cell 212 b in the battery 20 according to further embodiments of the present application. In this embodiment, the first tab 213a and the second tab 213b are arranged on one side of the composite cell composed of the first bare cell 212a and the second bare cell 212b, and the third tab 214 is arranged on the composite cell. On the side of the cell opposite to the side.

It should be noted that, in the above embodiment, the number of the third tabs 214 may be one or more. 43-48 only show an example in which the number of the third tabs 214 is one. When the number of the third tabs 214 is multiple, the number of charge-discharge links formed by the battery 20 is greater, and the charge-discharge speed of the battery 20 is further increased. However, as the number of the third tabs 214 increases, the volume occupied by the tabs in the battery 20 increases. On the premise that the volume of the battery 20 is constant, the volumetric energy density of the battery 20 decreases. Therefore, the number of the third tabs 214 can be designed according to the requirements of the charging and discharging speed and volumetric energy density in a specific scenario. When the number of the third tabs 214 is multiple, the plurality of third tabs 214 may be arranged on the same side, adjacent two sides, opposite sides of the composite bare cell, or on three or four sides around it. This is not specifically limited.

It should be noted that, the above-mentioned connection structure of the first bare cell 212a and the second bare cell 212b is performed only on the basis that the first bare cell 212a and the second bare cell 212b are stacked bare cells. instruction of. Of course, the first bare cell 212a and the second bare cell 212b may also be wound bare cells.

For example, please refer to FIG. 49, which is a schematic structural diagram of the first bare cell 212a, the second bare cell 212b, and the third tab 214 according to further embodiments of the present application. In this embodiment, the first bare cell 212a and the second bare cell 212b are both wound bare cells. The first bare cell 212a and the second bare cell 212b are stacked. The number of the tab units 214a of the third tab 214 is two, and the two tab units 214a are respectively formed by directly extending the current collector P21 of the second pole piece P2 and the current collector P41 of the fourth pole piece P4. The transfer conductor 214b and the two tab units 214a are electrically connected together by welding, pressing or the like. In some embodiments, the two tab units 214a may be stacked to facilitate electrical connection with the transition conductors 214b.

The differences between the battery 20 according to the first embodiment, the battery 20 according to the second embodiment, and the battery 20 according to the third embodiment have been described above. The common features of the three embodiments are described below with reference to the three embodiments.

Specifically, in the first embodiment, the second embodiment and the third embodiment, when the first bare cell 212a and the second bare cell 212b are both wound bare cells, please refer back to FIG. 23 and FIG. 25 26 , 27 , 29 and 38 , the first bare cell 212a is a first wound bare cell. The winding center of the first wound bare cell is the first winding center. The end of the first pole piece P1 located at the first winding center exceeds the end of the second pole piece P2 located at the first winding center. That is to say, it is assumed that the end of the first pole piece P1 located at the first winding center is the first end of the first pole piece P1, and the end of the second pole piece P2 located at the first winding center is the second pole piece The first end of P2, the orthographic projection of the first end of the first pole piece P1 on the first end of the second pole piece P2 is located outside the edge of the second pole piece P2. The first tab 213a is electrically connected to the current collector at the first end of the first pole piece P1. In this way, in the first wound-type bare cell, opposite sides of the first tab 213a are surrounded by the first pole piece P1 , and there is no need to use tab glue for insulation and isolation treatment, which can further improve the battery 20's durability. Volumetric energy density.

Similarly, please continue to refer to FIG. 23 , FIG. 25 , FIG. 26 , FIG. 27 , FIG. 29 and FIG. 38 , the second bare cell 212b is a second wound bare cell. The winding center of the second wound bare cell is the second winding center. The end of the third pole piece P3 located at the second winding center exceeds the end of the fourth pole piece P4 located at the second winding center. That is to say, it is assumed that the end of the third pole piece P3 at the second winding center is the first end of the third pole piece P3, and the end of the fourth pole piece P4 at the second winding center is the fourth pole piece The first end of P4, the orthographic projection of the first end of the third pole piece P3 on the first end of the fourth pole piece P4 is located outside the edge of the fourth pole piece P4. The second tab 213b is electrically connected to the current collector at the first end of the third pole piece P3. In this way, in the second wound-type bare cell, opposite sides of the second tab 213b are surrounded by the third pole piece P3, and no need to use tab glue for insulation and isolation treatment, which can further improve the battery 20's durability. Volumetric energy density.

In the above-mentioned first, second and third embodiments, one of the first pole piece P1 and the second pole piece P2 is a positive pole piece and the other is a negative pole piece, the third pole piece P3 and the fourth pole piece One of the sheets P4 is a positive pole piece and the other is a negative pole piece. Specifically, in the first embodiment, the second embodiment and the third embodiment, the polarity combinations of the first pole piece P1, the second pole piece P2, the third pole piece P3 and the fourth pole piece P4 may include the following example 1 to example Fourth, the first bare cell 212a and the second bare cell 212b are connected in parallel or in series to form a composite bare cell.

Example 1: The first pole piece P1 is a positive pole piece, the second pole piece P2 is a negative pole piece, the third pole piece P3 is a positive pole piece, and the fourth pole piece P4 is a negative pole piece. On this basis, since the first tab 213a is electrically connected to the current collector of the first pole piece P1, the second tab 213b is electrically connected to the current collector of the third pole piece P3, and the third tab 214 is used to lead out The electrodes of the second pole piece P2 and the fourth pole piece P4. Therefore, the first tab 213a and the second tab 213b are positive tabs, and the third tab 214 is a negative tab. The first bare cell 212a and the second bare cell 212b are connected in parallel to form a composite bare cell. The first charging and discharging port B and the second charging and discharging port C are arranged in parallel.

Example 2: The first pole piece P1 is a negative pole piece, the second pole piece P2 is a positive pole piece, the third pole piece P3 is a negative pole piece, and the fourth pole piece P4 is a positive pole piece. On this basis, since the first tab 213a is electrically connected to the current collector of the first pole piece P1, the second tab 213b is electrically connected to the current collector of the third pole piece P3, and the third tab 214 is used to lead out The electrodes of the second pole piece P2 and the fourth pole piece P4. Therefore, the first tab 213a and the second tab 213b are negative tabs, and the third tab 214 is a positive tab. The first bare cell 212a and the second bare cell 212b are connected in parallel to form a composite bare cell. The first charging and discharging port B and the second charging and discharging port C are arranged in parallel.

Example 3: The first pole piece P1 is a positive pole piece, the second pole piece P2 is a negative pole piece, the third pole piece P3 is a negative pole piece, and the fourth pole piece P4 is a positive pole piece. On this basis, since the first tab 213a is electrically connected to the current collector of the first pole piece P1, the second tab 213b is electrically connected to the current collector of the third pole piece P3, and the third tab 214 is used to lead out The electrodes of the second pole piece P2 and the fourth pole piece P4. Therefore, the first tab 213a is the positive tab, the second tab 213b is the negative tab, and the third tab 214 is the negative tab of the first bare cell 212a and the positive tab of the second bare cell 212b . The first bare cell 212a and the second bare cell 212b are connected in series to form a composite bare cell. The first charging and discharging port B and the second charging and discharging port C are arranged in series.

Example 4: The first pole piece P1 is a negative pole piece, the second pole piece P2 is a positive pole piece, the third pole piece P3 is a positive pole piece, and the fourth pole piece P4 is a negative pole piece. On this basis, since the first tab 213a is electrically connected to the current collector of the first pole piece P1, the second tab 213b is electrically connected to the current collector of the third pole piece P3, and the third tab 214 is used to lead out The electrodes of the second pole piece P2 and the fourth pole piece P4. Therefore, the first tab 213a is the negative tab, the second tab 213b is the positive tab, and the third tab 214 is the positive tab of the first bare cell 212a and the negative tab of the second bare cell 212b . The first bare cell 212a and the second bare cell 212b are connected in series to form a composite bare cell. The first charging and discharging port B and the second charging and discharging port C are arranged in series.

Referring back to FIG. 9 and FIG. 35 in conjunction with any one of the above examples 1 to 4, the protection board 22 has a first charge and discharge circuit and a second charge and discharge circuit. The first charging and discharging circuit and the second charging and discharging circuit are integrated on the protection plate 22, which is not shown in the figure. The first charging and discharging circuit is electrically connected to the first bare cell 212a through the first charging and discharging port B. As shown in FIG. On this basis, the protection board 22 also has a third charging and discharging port D. The third charging and discharging port D is located on the first charging and discharging circuit. The protection board 22 is used for being electrically connected with the power management module, the charging management module and the charger by means of the third charging and discharging port D, so as to form a charging and discharging link. Similarly, the second charging and discharging circuit is electrically connected to the second bare cell 212b through the second charging and discharging port C. On this basis, the protection board 22 also has a fourth charging and discharging port E, and the fourth charging and discharging port E is located on the second charging and discharging circuit. The protection board 22 is used for being electrically connected with the power management module, the charging management module and the charger by means of the fourth charging and discharging port E, so as to form another charging and discharging link.

In this way, the formation of at least two charge-discharge links can improve the charge-discharge speed of the battery 20, and at the same time, by means of the at least two charge-discharge links, the first bare cell 212a and the second bare cell 212b can be respectively charged and discharged. One of the battery cells performs charge and discharge management and detection of parameters such as capacity, cycle times, and health status, and can also perform charge and discharge management, capacity, cycle times, and health status for both the first bare cell 212a and the second bare cell 212b at the same time. detection of other parameters. To maximize the utilization of battery performance and state of health, it is also possible to charge one bare cell and discharge another bare cell at the same time.

It should be noted that the above embodiments only give an example in which the battery 20 includes the first bare cell 212a and the second bare cell 212b. In some other examples, on the basis of the first embodiment, the second embodiment or the third embodiment, the battery 20 may further include a third bare cell, a fourth bare cell, a fifth bare cell, and the like. The third bare cell, the fourth bare cell and the fifth bare cell may pass through a current collector of a pole piece and a current collector of the second pole piece in the first bare cell or the fourth bare cell in the second bare cell The collectors of the pole pieces are electrically connected to form a whole, and the electrodes of the whole are led out by means of the existing third tabs. In some other embodiments, the current collector of one pole piece of the third bare cell, the fourth bare cell and the fifth bare cell and the current collector of the second pole piece of the first bare cell may also be used. An extra tab is arranged between the electrodes, and the electrodes of the one type of pole piece and the second pole piece are simultaneously drawn out with the help of the extra tab, and one of the third bare cell, the fourth bare cell and the fifth bare cell can also be used. An extra tab is arranged between the current collector of the pole piece and the current collector of the fourth pole piece of the second bare cell, and the electrodes of the one type of pole piece and the fourth pole piece are simultaneously drawn out by means of the extra tab.

For example, please refer to FIG. 50 , which is a schematic structural diagram of a composite bare cell provided by further embodiments of the present application. In this embodiment, the battery 20 includes a third bare cell 212c in addition to the first bare cell 212a and the second bare cell 212b. The third bare cell 212c is disposed in the casing of the battery (not shown in the figure). Please refer to FIG. 51 . FIG. 51 is a schematic diagram of the end surface structure of the composite bare cell shown in FIG. 41 . In this embodiment, the third bare cell 212c includes a fifth pole piece P5, a sixth pole piece P6 and a fourth pole tab 213c. One of the fifth pole piece P5 and the sixth pole piece P6 is a positive pole piece and the other is a negative pole piece. The fourth tab 213c is electrically connected to the current collector of the fifth pole piece P5. One end of the fourth tab 213c protrudes out of the casing through the casing of the battery. The current collector of the sixth pole piece P6 is electrically connected to the current collector of the second pole piece P2 as a whole. Specifically, the current collector of the sixth pole piece P6 and the current collector of the second pole piece P2 may be electrically connected to form a whole through contact, electrical conduction, welding, and integral molding, which is not specifically limited herein. FIG. 51 only shows an example in which the current collector of the sixth pole piece P6 and the current collector of the second pole piece P2 are electrically connected as a whole through contact and electrical conduction.

In this way, in addition to the electrodes of the second pole piece P2 and the fourth pole piece P4, the third pole tab 214 can also lead out the electrodes of the sixth pole piece P6, which can further optimize the charging and discharging speed while taking into account the volume Energy Density. Moreover, in addition to being electrically connected to the part of the current collectors belonging to the second pole piece P2 and/or to the part of the current collectors belonging to the fourth pole piece P4 in the whole, the third tabs 214 can also be electrically connected to the whole On the part of the current collector belonging to the sixth pole piece P6, or between the current collector of the sixth pole piece P6 and the current collector of the second pole piece P2, and both electrically connected to the current collector of the sixth pole piece P6 , and is electrically connected to the current collector of the second pole piece P2.

For another example, please refer to FIG. 52 , which is a schematic diagram of an end surface structure of a composite bare cell provided by some embodiments of the present application. In this embodiment, the current collector of the sixth pole piece P6 and the current collector of the fourth pole piece P4 are electrically connected as a whole. In this way, the third pole tab 214 can also lead out the electrodes of the second pole piece P2, the fourth pole piece P4 and the sixth pole piece P6 at the same time, which can further optimize the charging and discharging speed while taking into account the volume energy density.

For another example, please refer to FIG. 53 . FIG. 53 is a schematic diagram of an end surface structure of a composite bare cell provided by further embodiments of the present application. In this embodiment, the battery further includes a fifth tab 216 . The fifth tab 216 is disposed between the current collector of the second pole piece P2 and the current collector of the sixth pole piece P6, and the fifth tab 216 is electrically connected to the current collector of the second pole piece P2, while the fifth pole The ear 216 is also electrically connected to the current collector of the sixth pole piece P6. One end of the fifth tab 216 protrudes out of the casing through the casing of the battery (not shown in the figure). In this way, while further optimizing the charging and discharging speed of the battery, the volumetric energy density can be taken into account to a certain extent.

For another example, please refer to FIG. 54. FIG. 54 is a schematic diagram of an end surface structure of a composite bare cell provided by some embodiments of the present application. In this embodiment, the battery further includes a fifth tab 216 . The fifth tab 216 is disposed between the current collector of the fourth pole piece P4 and the current collector of the sixth pole piece P6, and the fifth tab 216 is electrically connected to the current collector of the fourth pole piece P4, while the fifth pole The ear 216 is also electrically connected to the current collector of the sixth pole piece P6. One end of the fifth tab 216 protrudes out of the casing through the casing of the battery (not shown in the figure).

It should be noted that, on the basis of the above-mentioned third embodiment, the third tab 214 includes a plurality of tab units 214a and transition conductors 214b. The plurality of tab units 214a are respectively formed by directly extending the current collectors P21 of the second pole piece P2 and the current collectors P41 of the fourth pole piece P4. Based on this, the third tab further includes a tab portion. The structure of the tab portion is similar to that of the tab unit 214a. The tab portion is directly extended from the current collector of the sixth pole piece P6, and the transfer conductor 214b is electrically connected to the tab portion in addition to being electrically connected to the tab unit 214a. In this way, one electrode of the three bare cells is simultaneously drawn out through the transfer conductor, which can further optimize the charging and discharging speed of the battery, and at the same time, the volume energy density can be taken into account to a certain extent.

Based on the descriptions of the above embodiments, the following takes the battery 20 shown in FIG. 35 as an example to introduce the manufacturing method of the battery 20 . Specifically, the processing method of the battery 20 includes the following steps S100-S400.

S100: Fabricate the first bare cell 212a and the second bare cell 212b. The first bare cell 212a and the second bare cell 212b are both wound bare cells.

Please refer to FIG. 55 . FIG. 55 is a schematic structural diagram of the composition of the first bare cell 212 a in the method for processing the battery 20 provided by some embodiments of the present application. In this embodiment, the first bare cell 212a includes the second pole piece P2, the diaphragm S, the first pole piece P1 and the diaphragm S. The second pole piece P2, the diaphragm S, the first pole piece P1, and the diaphragm S are stacked in sequence, and the first rolling device 01 in the processing system shown in FIG. 56 is used to form a first diaphragm structure, and then further use The first winding needle 02 in the first winding station in the processing system shown in FIG. 56 rotates with one end of the first membrane structure clamped, so as to be wound to form the processing method shown in (a) in the flow chart of FIG. 58 . The first bare cell 212a.

Please refer to FIG. 57 . FIG. 57 is a schematic diagram of the composition and structure of the second bare cell 212 b in the manufacturing method of the battery 20 provided by some embodiments of the present application. In this embodiment, the second bare cell 212a includes a fourth pole piece P4, a diaphragm S, a third pole piece P3 and a diaphragm S. The fourth pole piece P4, the diaphragm S, the third pole piece P3, and the diaphragm S are stacked in sequence, and the second rolling device 03 in the processing system shown in FIG. 56 is used to form a second diaphragm structure. The second winding needle 04 in the second winding station in the processing system shown in 56 rotates with one end of the second membrane structure clamped, so as to wind up to form the second winding needle 04 shown in (a) in the flow chart of the processing method shown in FIG. 58 . Two bare cells 212b.

The first bare cell 212a and the second bare cell 212b can be wound simultaneously by using the first winding needle 01 of the first winding station and the second winding needle 02 of the second winding station, respectively. The production efficiency of the first bare cell 212a and the second bare cell 212b can be improved.

S200: Disposing the third tab 214 between the first bare cell 212a and the second bare cell 212b, and the relative positional relationship among the first bare cell 212a, the second bare cell 212b and the third tab 214 Referring to (b) in FIG. 58, the third tab 214 is welded to the current collector of the second pole piece P2 in the first bare cell 212a, and the third tab is welded to the second bare cell at the same time On the current collector of the fourth pole piece P4 in 212b, a series or parallel composite bare cell is obtained, and the composite bare cell is shown in (c) in FIG. 58 . Specifically, the welding operation can be implemented on the welding station 05 in the processing system shown in FIG. 56 , and the welding station can be located between the first winding station and the second winding station.

S300 : Please refer to (d) in FIG. 58 , encapsulate the above-mentioned bare composite battery cell with the case 211 , and inject electrolyte into the case 211 to obtain the cell 21 shown in (e) in FIG. 58 . Wherein, the casing 211 may be a packaging film or a steel shell. In some embodiments, the packaging film is an aluminum plastic film.

S400 : Connect the protective plate to the battery cell 21 , that is, obtain a finished battery containing at least two series or parallel or combined series and parallel winding cores inside.

In the description of this specification, the particular features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions in the embodiments of the present application.

Claims

A battery, characterized in that, comprising:

case;

A first bare cell, the first bare cell is disposed in the housing, the first bare cell includes a first pole piece, a second pole piece and a first tab, the first pole piece and One of the second pole pieces is a positive pole piece and the other is a negative pole piece, and the first tab is electrically connected to the current collector of the first pole piece;

A second bare cell, the second bare cell is disposed in the housing, the second bare cell includes a third pole piece, a fourth pole piece and a second pole lug, the third pole piece and One of the fourth pole pieces is a positive pole piece and the other is a negative pole piece, and the second tab is electrically connected to the current collector of the third pole piece;

The third pole tab, the third pole tab leads out the electrodes of the second pole piece and the fourth pole piece at the same time, and the first pole tab, the second pole tab and the third pole tab One end of the shell protrudes out of the shell through the shell.
The battery according to claim 1, wherein the current collector of the second pole piece and the current collector of the fourth pole piece are electrically connected to form a whole, and the third tab is electrically connected to the whole superior.
The battery according to claim 2, characterized in that the current collector of the second pole piece and the current collector of the fourth pole piece are electrically connected to form the whole by contacting electrical conduction, direct welding or integral molding. .
The battery according to claim 2 or 3, wherein the third tab is electrically connected to a part of the current collector belonging to the second pole piece in the whole.
The battery according to claim 2 or 3, wherein the third tab is electrically connected to a part of the current collector belonging to the fourth pole piece in the whole.
The battery according to claim 2 or 3, wherein the third tab is located between the current collector of the second pole piece and the current collector of the fourth pole piece, and the third tab is located between the current collector of the second pole piece and the current collector of the fourth pole piece The third tab is also electrically connected to the part of the current collectors belonging to the fourth pole piece in the whole body.
The battery according to claim 1, wherein the third tab is disposed between the current collector of the second pole piece and the current collector of the fourth pole piece, and the third tab is electrically connected to the current collector of the second pole piece, and the third tab is also electrically connected to the current collector of the fourth pole piece.
The battery according to claim 1, wherein the third tab comprises a plurality of tab units and transfer conductors, and the plurality of tab units are respectively composed of the current collector and all of the second pole piece. The current collector of the fourth pole piece is directly extended and formed, and the transfer conductor is electrically connected to the plurality of tab units.
The battery according to any one of claims 1-8, wherein the first pole piece and the third pole piece are both positive pole pieces, the first pole tab and the second pole tab Both are positive tabs;

The second pole piece and the fourth pole piece are both negative pole pieces, and the third pole tab is a negative pole tab.
The battery according to any one of claims 1-8, wherein the first pole piece and the first pole piece of the second bare cell are both negative pole pieces, and the first tab and the first pole piece are both negative pole pieces. The second pole tabs are all negative pole tabs;

The second pole piece of the first bare cell and the second pole piece of the second bare cell are positive pole pieces, and the third tabs are positive pole tabs.
The battery according to any one of claims 1-8, wherein the first pole piece is a positive pole piece, the first pole tab is a positive pole tab, and the second pole piece is a negative pole piece The third pole piece is a negative pole piece, the second pole lug is a negative pole piece, and the fourth pole piece is a positive pole piece; the third pole piece is the negative pole of the first bare cell The tab is the positive tab of the second bare cell;

Alternatively, the first pole piece is a negative pole piece, the first pole piece is a negative pole piece, the second pole piece is a positive pole piece; the third pole piece is a positive pole piece, and the second pole piece is a positive pole piece, and the second pole piece is a positive pole piece. The tabs are positive tabs, the fourth tabs are negative tabs, and the third tabs are positive tabs of the first bare cell and negative tabs of the second bare cell.
The battery according to any one of claims 1-11, wherein the first bare cell and the second bare cell are wound bare cells or stacked bare cells.
The battery according to any one of claims 1-11, wherein the first bare cell is a first wound bare cell, and the winding center of the first wound bare cell is The first winding center, the end of the first pole piece located at the first winding center exceeds the end of the second pole piece located at the first winding center, and the first pole tab is electrically connected to the current collector at one end of the first pole piece located at the first winding center.
The battery according to any one of claims 1-11, wherein the second bare cell is a second wound bare cell, and the winding center of the second wound bare cell is The second winding center, the end of the third pole piece located at the second winding center exceeds the end of the fourth pole piece located at the second winding center, and the second pole tab is electrically connected to the current collector at one end of the third pole piece located at the center of the second winding.
The battery according to any one of claims 1-14, wherein the first tab and the third tab form a first charge and discharge port, and the second tab and the third tab form a first charge-discharge port. The ear forms a second charging and discharging port;

The battery further includes a protection plate, the protection plate has a first charge and discharge circuit, a second charge and discharge circuit, a third charge and discharge port and a fourth charge and discharge port;

The first charge and discharge circuit is electrically connected to the first bare cell by means of the first charge and discharge port, the third charge and discharge port is located on the first charge and discharge circuit, and the protection plate is used for The third charging and discharging port is electrically connected with the power management module, the charging management module and the charger to form a charging and discharging link;

The second charging and discharging circuit is electrically connected to the second bare cell by means of the second charging and discharging port, the fourth charging and discharging port is located on the second charging and discharging circuit, and the protection plate is used for charging and discharging by means of the second charging and discharging port. The fourth charging and discharging port is electrically connected with the power management module, the charging management module and the charger to form another charging and discharging link.
The battery according to any one of claims 1-15, further comprising:

A third bare cell, the third bare cell is disposed in the housing, the third bare cell includes a fifth pole piece, a sixth pole piece and a fourth pole lug, the fifth pole piece and One of the sixth pole pieces is a positive pole piece and the other is a negative pole piece, and the fourth tab is electrically connected to the current collector of the fifth pole piece;

The collector of the sixth pole piece is electrically connected to the collector of the second pole piece as a whole, or the collector of the sixth pole piece is electrically connected to the collector of the fourth pole piece as a whole , and one end of the fourth tab protrudes out of the casing through the casing.
The battery according to any one of claims 1-15, further comprising:

A third bare cell, the third bare cell is disposed in the housing, the third bare cell includes a fifth pole piece, a sixth pole piece and a fourth pole lug, the fifth pole piece and One of the sixth pole pieces is a positive pole piece and the other is a negative pole piece, and the fourth tab is electrically connected to the current collector of the fifth pole piece;

a fifth tab, the fifth tab is disposed between the current collector of the second pole piece and the current collector of the sixth pole piece, and the fifth tab is electrically connected to the second pole piece on the current collector, and the fifth tab is also electrically connected to the current collector of the sixth pole piece; or, the fifth tab is arranged on the current collector of the fourth pole piece and the first Between the current collectors of the six pole pieces, the fifth pole tab is electrically connected to the current collector of the fourth pole piece, and the fifth pole tab is also electrically connected to the current collector of the sixth pole piece ; One end of the fourth pole lug and the fifth pole lug protrudes out of the casing through the casing.
The battery of claim 8, further comprising:

A third bare cell, the third bare cell is disposed in the housing, the third bare cell includes a fifth pole piece, a sixth pole piece and a fourth pole lug, the fifth pole piece and One of the sixth pole pieces is a positive pole piece and the other is a negative pole piece, and the fourth tab is electrically connected to the current collector of the fifth pole piece;

The third tab further includes a tab part, the tab part is formed by the direct extension of the current collector of the sixth pole piece, and the transfer conductor is also electrically connected to the tab part.
An electronic device, comprising:

a casing, a battery compartment is arranged in the casing;

a power management module and a charging management module, the power management module and the charging management module are arranged in the casing;

The battery according to any one of claims 1-18, wherein the battery is installed in the battery compartment, the battery is electrically connected to the power management module, and the battery is also electrically connected to the charging management module.