WO2023151492A1

WO2023151492A1 - Battery

Info

Publication number: WO2023151492A1
Application number: PCT/CN2023/074072
Authority: WO
Inventors: 王燕青; 宗彦震; 罗自皓
Original assignee: 珠海冠宇电源有限公司
Priority date: 2022-02-10
Filing date: 2023-02-01
Publication date: 2023-08-17
Also published as: CN114361559A

Abstract

The present application provides a battery, comprising a battery cell and a housing. The housing is located on the periphery of the battery cell. Top sealing edges and side sealing edges are formed on the housing at the periphery of the battery cell. Each side sealing edge comprises a first main body part and a first extension part. The first main body parts are located on side end surfaces of the battery. The side end surfaces are the end surfaces of the battery in the width direction. The first main body parts are bent towards the side end surfaces. The first extension parts extend out of top end surfaces of the battery. The top end surfaces are the end surfaces of the battery in the height direction. At least part of the area of the first extension parts is bent towards the first main body parts, and is located on the side of the side sealing edges facing the side end surfaces. By means of the battery provided by the present invention, the capacitance of the battery cell can be improved, the endurance time of the electronic device is prolonged, and in addition, corrosion of the end parts of the side sealing edges can be prevented, so that the use safety of the battery can be improved.

Description

Battery

This application claims the priority of the Chinese patent application with the application number 202210126687.8 and the application name "battery" submitted to the China Patent Office on February 10, 2022, the entire contents of which are incorporated in this application by reference.

technical field

The present application relates to the technical field of electronic equipment, in particular to a battery.

Background technique

A battery is a device that can store electrical energy inside to power external devices (such as portable or mobile electronic devices such as mobile phones, tablets, laptops, personal digital assistants, etc.) when needed. At present, with the increasing size of mobile phone screens and the development of the fifth generation mobile communication technology (5th Generation Mobile Communication Technology, referred to as 5G), the power consumption of mobile phones is getting higher and higher.

Generally, a battery includes a battery cell and a casing located on the periphery of the battery cell. The battery cell is packaged through the casing, and the casing is made of aluminum-plastic film material to protect the battery.

However, in the related art, the casing of the battery, for example, at the top edge and/or the side edge, is prone to short circuit and corrosion with other metal components of the electronic device, resulting in low safety of the battery.

Contents of the invention

The present application provides a battery to solve the problem of low safety of the current battery, and can effectively improve the safety of the battery.

According to an aspect of an embodiment of the present application, a battery is provided, including: a battery cell and a casing,

The shell is located on the outer periphery of the cell, and the shell is formed with a top seal and a side seal on the edge of the cell;

Wherein, the side sealing edge includes a first main body part and a first extension part, the first main body part is located at the side end surface of the battery, the side end surface is the end surface of the battery along the width direction, and the first main body part is bent toward the side end surface; In the height direction of the battery, the first extension part protrudes from the top end surface of the battery, and the top end surface is the end surface of the battery along the height direction. At least a part of the first extension part is bent toward the first main body, and is located at the side of the side sealing edge facing the side end surface. side.

In an optional design, along the width direction of the battery core, the top sealing edge includes a second main body part and a second extension part, the second main body part is located on the top surface of the battery core, and at least part of the second main body part faces The top end surface is bent; the second extension part is connected with the first extension part.

In an optional design manner, the first extension part includes a first part and a second part, the second part is bent toward the first main body part, and the second part is located between the first part and the second extension part.

In an optional design manner, the second extension part includes a third part and a fourth part; the third part is located between the fourth part and the second main body part, and the fourth part is connected to the second part.

In an optional design, the third part is bent away from the top surface, and the fourth part is bent towards the top surface.

In an optional design manner, at least part of the second extension part is flat on the top end surface, and the second extension part is connected to the second part.

In an optional design, the angle between the second extension part and the second main body is 80-170 degrees.

In an optional design, the angle between the second main body and the second part is 90-170 degrees.

In an optional design, the angle between the second part and the second extension is 0-45 degrees.

In an optional design, the length of the second part is less than or equal to the length of the first part.

In an optional design, the length of the second part is 0.5-10.0mm; and/or,

The height of the first part along the length direction of the battery core is 0-10mm.

In an optional design manner, the length of the second part is greater than that of the first part, and the second part is located between the side sealing edge and the side end surface.

In an optional design, the battery further includes a protection plate and tabs, the protection plate is electrically connected to the battery cell through the tabs, and the protection plate is located on the side of the top sealing edge away from the top surface.

In an optional design manner, the first extension part includes a first part and a second part, and the second part is bent toward the first main body part;

The height of the first part extending beyond the outer surface of the top sealing edge is less than or equal to the thickness of the protective plate.

In an optional design, along the width direction of the battery, the protective plate is offset from the first extension Open settings.

In an optional design manner, the tab includes a first connection section and a second connection section, the second connection section is connected to the battery cell through the first connection section, and the second connection section is used to connect to the protective plate.

In an optional design mode, the projection of the tab on the plane of the top surface is located in the top surface; wherein, the cell body includes a first surface and a second surface opposite in the thickness direction, and the top sealing edge faces the first surface. surface bending;

The distance between the side of the first connection section close to the first surface and the first surface is greater than or equal to 0.2mm, or the distance between the side of the first connection section close to the second surface and the second surface is greater than or equal to 0.2mm mm.

In an optional design, the connection between the protective plate and the tab faces the battery core, or the connection between the protective plate and the tab faces away from the battery core.

In an optional design, a compressible medium is filled between the protective plate and the battery core, and the compressible medium is in contact with the top surface and the protective plate respectively.

In an optional design mode, the battery further includes an insulating layer;

A part of the insulating layer is attached to the outer surface of the protective plate, and the other part of the insulating layer is attached to the electric core.

The battery provided according to the embodiment of the present application includes a cell and a casing, the casing is located on the periphery of the cell, and a top seal and a side seal are formed on the edge of the cell, wherein the side seal includes a first body part and a side seal. The first extension part, the first main body is located on the side end surface of the battery, and the first main body is bent toward the side end surface, so that the occupied space of the first main body can be reduced, thereby improving the energy density of the battery; in addition, along the According to the height direction of the battery, the first extension part protrudes from the top end surface of the battery. In the embodiment of the present application, at least part of the top sealing edge of the first extension part is bent toward the first main body part and the side of the battery cell. Folding, so that at least a partial area of the first extension part is located on the side of the side sealing edge facing the side end surface. In this way, after the first extension part is bent, the section of the aluminum-plastic film of the shell faces the direction of the electric core, which can prevent the section of the aluminum-plastic film shell from contacting or approaching other metals of the electronic device and cause a short circuit. The plastic film case should be subject to short-circuit corrosion, so that the safety of the battery can be improved.

In addition to the technical problems solved by the embodiments of the present application described above, the technical features that constitute the technical solutions, and the beneficial effects brought by the technical features of these technical solutions, other technical problems that the battery provided by the embodiments of the present application can solve , other technical features included in the technical proposal and this The beneficial effects brought by these technical features will be further described in detail in the specific implementation manner.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present application. Those skilled in the art can also obtain other drawings based on these drawings without any creative effort.

FIG. 1 is a schematic diagram of an exploded structure of an electronic device provided in an embodiment of the present application;

Fig. 2 is a schematic structural diagram of a battery provided in an embodiment of the present application;

Fig. 3 is a partial enlarged view of place A in Fig. 2;

Fig. 3a is a structural schematic diagram of another viewing angle of Fig. 3;

Fig. 4 is a partial schematic diagram of another structure of the battery provided by the embodiment of the present application;

Fig. 5a is a structural schematic diagram of the cooperation between the cell and the casing in the battery provided by the embodiment of the present application;

Fig. 5b is another structural schematic diagram of the cooperation between the cell and the casing in the battery provided by the embodiment of the present application;

Fig. 6 is a partially enlarged view at C in Fig. 5b;

Figure 7 is a partial enlarged view at D in Figure 5b;

Fig. 8 is another structural schematic diagram of the cooperation between the cell and the casing in the battery provided by the embodiment of the present application;

Fig. 9 is a partial enlarged view of E place in Fig. 8;

Figure 10 is a partial enlarged view at F in Figure 8;

Fig. 11 is a schematic structural diagram of the cooperation between the cell and the protection plate in the battery provided by the embodiment of the present application;

Fig. 12 is another structural schematic diagram of the cooperation between the cell and the protective plate in the battery provided by the embodiment of the present application;

Fig. 13 is another structural schematic diagram of the cooperation between the cell and the casing in the battery provided by the embodiment of the present application;

Fig. 14 is a schematic structural diagram of the connection between the protective plate and the tab in the battery provided by the embodiment of the present application;

Fig. 15 is another structural schematic diagram of the connection between the protective plate and the tab in the battery provided by the embodiment of the present application;

Fig. 16 is another structural schematic diagram of the connection between the protection plate and the tab in the battery provided by the embodiment of the present application;

Fig. 17 is another structural schematic diagram of the connection between the protection plate and the tab in the battery provided by the embodiment of the present application;

Fig. 18 is another schematic structural view of the battery provided by the embodiment of the present application.

Explanation of reference signs:

10 - electronic equipment;

100-display screen; 200-housing; 300-battery;

310-cell; 320-shell; 330-protection plate; 340-ear; 350-compressible medium; 360-insulation layer;

311-top end face; 312-side end face; 321-top edge sealing; 322-side edge sealing; 323-protruding part; 341-first connecting section; 342-second connecting section;

3211-second body part; 3212-second extension part; 3221-first body part; 3222-first extension part; 3222a-first part; 3222b-second part; 3212a-third part; 3212b-fourth part .

Detailed ways

In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in this application. Obviously, the described embodiments are part of the embodiments of this application , but not all examples. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

In the description of the present application, it should be understood that the orientation or positional relationship (if any) indicated by the terms "inner", "outer", "upper", "bottom", "front", "rear" etc. are Based on the orientation or positional relationship shown in Figure 1, it is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot understood as a limitation of the application.

FIG. 1 is a schematic diagram of an exploded structure of an electronic device provided by an embodiment of the present application.

Referring to FIG. 1 , an embodiment of the present application provides an electronic device 10 , wherein the electronic device 10 may be the aforementioned portable electronic device 10 such as a mobile phone, a tablet computer, a notebook computer or a personal digital assistant. For ease of understanding, in the embodiment of the present application, the electronic device 10 is a mobile phone as a specific Example to illustrate.

1, the electronic device 10 includes a display screen 100, a housing 200, and electronic components disposed in the housing 200, wherein the electronic components disposed in the housing 200 may specifically be, for example, a processor, a memory , cameras, microphones and speakers and other electronic components. It can be understood that other electronic components may also be provided in the electronic device 10, which will not be described one by one in this embodiment of the present application.

When these electronic components are working, for example, the display screen 100 displays video, images, or text information, or the processor processes and executes the received operation signal, or the speaker plays the audio signal, etc., all need to consume electrical energy. That is to say, the user needs to consume power when using the aforementioned portable electronic device 10 .

Referring to FIG. 1 , in order to meet the usage of the aforementioned portable electronic device 10 , the electronic device 10 usually further includes a battery 300 . Specifically, the battery 300 can be arranged inside the casing 200 of the electronic device 10 , and provide the electric energy required for the operation of each electronic component inside the electronic device 10 .

It can be understood that the battery 300 may be connected to the electronic device 10 in a detachable manner. The casing 200 is detachably connected, and the battery 300 can be installed to the electronic device 10 through the opened back cover.

Certainly, in some optional examples, in order to improve the portability of the electronic device 10 , the battery 300 may also be directly built into the casing 200 of the electronic device 10 . That is to say, when producing the electronic equipment 10, the battery 300 can be directly packaged inside the casing 200 of the electronic equipment 10, so that, on the one hand, the portability of the electronic equipment 10 can be improved, and on the other hand, the battery 300 can also be improved. The stability of the electrical connection of the electronic device 10 .

It can be understood that the battery 300 is a battery that can store electrical energy inside. The battery 300 generally includes a battery cell 310 and a casing 320 located on the periphery of the battery cell 310. The battery cell 310 is packaged through the casing 320. The casing 320 is usually made of aluminum. The plastic film material protects the battery 300 .

However, the casing 320 of the battery 300 is prone to short-circuit and corrode with other metal components of the electronic equipment, such as at the top sealing edge 321 and/or the side sealing edge 322 , resulting in low safety of the battery 300 .

Figure 2 is a schematic structural view of the battery provided by the embodiment of the present application, Figure 3 is a partial enlarged view of A in Figure 2, Figure 3a is a schematic structural view of another perspective of Figure 3, and Figure 4 is a schematic view of the battery provided by the embodiment of the present application A partial schematic diagram of another structure of the battery.

Referring to FIGS. 2-4 , the embodiment of the present application provides a battery 300 , including: a battery cell 310 and a casing 320 .

The casing 320 is located on the outer periphery of the battery cell 310 , and the casing 320 is formed with a top sealing edge 321 and a side sealing edge 322 at the edge of the battery cell 310 .

Usually, the battery core 310 cannot be used directly, and the outer periphery of the battery core 310 is coated/wrapped with a casing 320 . In some specific examples, the housing 320 can be made of aluminum-plastic film material, wherein the aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance and electrolyte resistance stability, etc., and is often used as The casing 320 of the battery cell 310 . In addition, the aluminum layer of the aluminum-plastic film has good thermal conductivity, and can also dissipate heat for the battery cell 310 in time.

Generally, in order to package the electric core 310 well with the aluminum plastic film, the casing 320 is formed with a top sealing edge 321 and a side sealing edge 322 at the edge of the electric core 310 . Usually, both the top sealing edge 321 and the side sealing edge 322 will exceed the edge of the electric core 310. For example, referring to FIG. Edges on both sides of the core 310.

Referring to FIG. 3 and FIG. 4 , the side sealing edge 322 includes a first main body portion 3221 and a first extension portion 3222 , and the first main body portion 3221 is located on the side end surface 312 of the battery 300 .

Wherein, the side end surface 312 may be the end surface of the battery 300 along the width direction. For example, referring to FIG. 2 , the side end surface 312 may refer to the left and right end surfaces along the x direction in FIG. The first main body portion 3221 is bent toward the side end surface 312 .

Specifically, in the embodiment of the present application, the first main body part 3221 can be bent towards the direction of the battery cell 310, and the bending angle can be close to or approximately 90 degrees, so that the first main body part 3221 can be attached to the side end surface 312 superior. In this way, the space occupied by the side sealing edge 322 along the width direction of the battery 300 can be reduced, thereby improving the energy density of the battery 300 .

It should be noted that, along the height direction of the battery 300 , the first extension portion 3222 extends out of the top end surface 311 of the battery 300 .

Wherein, the height direction of the battery 300 may also be referred to as the length direction of the battery 300 in some examples, such as the direction shown by the y-axis in FIG. 2 . That is to say, in the embodiment of the present application, the length of the side sealing edge 322 along the height direction of the battery 300 is greater than the height of the battery 300 , so that the first extension 3222 exceeds the top surface 311 of the battery 300 .

Fig. 5a is a schematic structural diagram of the cooperation between the cell and the casing in the battery provided by the embodiment of the present application, and Fig. 5b is a schematic diagram of another structure of the cooperation between the cell and the casing in the battery provided by the embodiment of the present application. 6 is a partially enlarged view at C in FIG. 5b, and FIG. 7 is a partially enlarged view at D in FIG. 5b.

5a-7, when manufacturing the battery 300 provided by the embodiment of the present application, as shown in FIG. A top sealing edge 321 and a side sealing edge 322 are formed at the edge of the battery cell 310 , and both the top sealing edge 321 and the side sealing edge 322 exceed the edge of the battery cell 310 . For example, as shown in FIG. 5a, after the electric core 310 is packaged by the casing 320, the side sealing edge 322 exceeds the edge of the electric core 310 on both sides of the electric core 310 (for example, the left and right sides along the x direction in FIG. 5a ). , at the top of the cell 310 (for example, the side along the y direction in FIG. 5 a ), the top sealing edge 321 exceeds the edge of the cell 310 .

It can be understood that the top sealing edge 321 and the side sealing edge 322 both exceed the edge of the battery cell 310, and the top sealing edge 321 and the side sealing edge 322 will inevitably occupy a certain volume of the battery 300, resulting in the same volume of the battery 300, the battery cell 310 relatively reduced in size. In order to improve the capacitance of the battery cell 310, as shown in FIG. On the side end surface of the core 310.

It can be understood that after the aluminum-plastic film casing 320 is cut or trimmed, the cross-section of the aluminum-plastic film is exposed, that is, the aluminum layer in the aluminum-plastic film is exposed, and the exposed aluminum layer is easily separated from other parts of the electronic device. Metal contacts, resulting in a short circuit; or, when the exposed aluminum layer is close to other metals in the electronic device, tip discharge may occur, which may affect the safety of the electronic device.

For this reason, in the embodiment of the present application, as shown in FIG. 3 and FIG. 4 , at least a partial area of the first extension portion 3222 is bent toward the first main body portion 3221 and is located on the side of the side edge 322 toward the side end surface 312 .

That is to say, in the embodiment of the present application, at least a partial area of the first extension part 3222 is bent toward the direction of the battery cell 310, and in some examples, the bending direction of at least a partial area of the first extension part 3222 can also be It is understood as bending toward the inner side of the side sealing edge 322 . It should be noted that the inner side of the side sealing edge 322 refers to the side facing the side end surface 312 .

When the battery 300 provided in the embodiment of the present application is specifically manufactured, refer to Fig. 5b-Fig. Bend, for example, bend 180 degrees. Then, the side sealing edge 322 is bent towards the direction of the battery core 310 close to or approximately 90 degrees.

According to the battery 300 provided in the embodiment of the present application, the battery 300 includes a cell 310 and an outer The shell 320, the shell 320 is located on the outer periphery of the battery cell 310, and a top seal 321 and a side seal 322 are formed at the edge of the battery 310, wherein the side seal 322 includes a first main body portion 3221 and a first extension portion 3222 , the first main body portion 3221 is located on the side end surface 312 of the battery 300, and the first main body portion 3221 is bent toward the side end surface 312, so that the occupied space of the first main body portion 3221 can be reduced, thereby improving the energy density of the battery 300; In addition, along the height direction of the battery 300, the first extension part 3222 protrudes from the top end surface 311 of the battery 300. In the embodiment of the present application, at least part of the top sealing edge 321 of the first extension part 3222 faces the first main body part. 3221 , and bent toward the side of the battery core 310 , so that at least a partial area of the first extension portion 3222 is located on the side of the side sealing edge 322 facing the side end surface 312 . In this way, after the first extension part 3222 is bent, the section of the aluminum-plastic film of the casing 320 faces the direction of the battery cell 310, which can prevent the section of the aluminum-plastic film casing 320 from contacting or approaching other metals of the electronic device to cause a short circuit. It can also avoid short-circuit corrosion of the aluminum-plastic film casing 320 , thereby improving the safety of the battery 300 .

Continuing to refer to FIG. 3 and FIG. 4 , in an optional design, along the width direction of the battery cell 310 , the top sealing edge 321 includes a second main body portion 3211 and a second extension portion 3212 , and the second main body portion 3211 Located on the top surface 311 of the cell 310 , and the second main body portion 3211 is bent toward the top surface 311 ; the second extension portion 3212 is connected to the first extension portion 3222 .

Specifically, the width direction of the battery cell 310 may refer to the direction shown by the x-axis in FIG. 3 or FIG. 4 . It can be understood that the two ends of the top sealing edge 321 are respectively connected with the side sealing edges 322, therefore, in the embodiment of the present application, the second extension part 3212 may be located at both ends of the second main body part 3211, that is to say, the second extension part 3212 Section 3212 has two.

Fig. 8 is another structural schematic diagram of the cooperation between the cell and the casing in the battery provided by the embodiment of the present application, Fig. 9 is a partial enlarged view of E in Fig. 8, and Fig. 10 is a partial enlarged view of F in Fig. 8 .

5a-10, the battery 300 of the embodiment of the present application can be bent at the corners of the top sealing edge 321 and the side sealing edge 322 during specific production, that is to say, the second extension Part 3212 and a part of the first extension part 3222 are bent, for example, bent 180 degrees (as shown in FIG. 6 ), and then the top sealing edge 321 is folded toward/facing the side of the battery core 310, for example, folded 90 degrees, so that The top sealing edge 321 is parallel to or approximately parallel to the top surface 311 of the electric core 310 (refer to FIG. 9 ), and then the side sealing edge 322 is bent toward the direction of the electric core 310 close to or approximately 90 degrees, so that the present application can be obtained The structure of the battery 300 of the embodiment (refer to FIG. 3 or FIG. 4).

By folding the top edge 321 toward/facing the side of the battery 310, for example, by 90 degrees, so that If the top sealing edge 321 is parallel to or approximately parallel to the top surface 311 of the electric core 310, the distance that the top sealing edge extends outward on the top surface 311 of the electric core 310 can be sufficiently reduced, that is to say, the top sealing edge can be reduced. The space occupied in the length direction of the battery cell 310 can increase the volume of the battery 300 , increase the size of the battery cell 310 , and increase the capacity of the battery cell 310 .

3 to 4, the first extension portion 3222 includes a first portion 3222a and a second portion 3222b, the second portion 3222b is bent toward the first main body portion 3221, that is to say, the second portion 3222b refers to the first A portion of the extension portion 3222 is bent toward the first main body portion 3221 or toward the top end surface 311 . Wherein, the second portion 3222b is located between the first portion 3222a and the second extension portion 3212 .

In this way, after the side sealing edge 322 and the top sealing edge 321 are folded, the first main body part 3221 and the second main body part 3211 are connected by the first part 3222a, the second part 3222b and the second extension part 3212; The side sealing edge 322 and the top sealing edge 321 are a complete whole without any section, which can reduce the occurrence of corrosion at the section and improve the use safety of the battery 300 .

Continuing to refer to FIG. 3 and FIG. 4 , the length of the second portion 3222b is less than or equal to the length of the first portion 3222a.

In the embodiment of the present application, the length of the second part 3222b is set to be less than or equal to the length of the first part 3222a, so that the second part 3222b will not exceed the top surface 311 of the battery cell 310, in other words, the second part 3222b will not Interference with the battery cell 310 occurs. In this way, the volume or size of the battery cell 310 will not be affected. The size of the battery cell 310 can be effectively increased, and the capacity of the battery cell 310 can be increased.

In some specific examples, the folded length of the second part 3222b is 0.5-10.0 mm; the length of the first part 3222a along the height direction of the battery cell 310 is 0-10 mm.

Specifically, after the two ends of the top sealing edge 321 are folded 180 degrees, the two ends of the top sealing edge 321 can be understood as forming a chamfered structure. Wherein, the length of the second part 3222b can be understood as the length of the chamfered structure in the edge direction of the side sealing edge 322, and in some specific examples, it can be 0.5mm, 2.5mm, 4.5mm and so on. Specifically, the length of the first part along the height direction of the battery cell 310 may be 1mm, 3mm, 5mm, 7mm or 10mm, etc. It should be noted that the aforementioned length of the second portion 3222b is only illustrated as some specific examples, and is not a limitation to the specific length of the second portion 3222b.

It should be noted here that the numerical values and numerical ranges involved in the embodiments of the present application are approximate values, and there may be a certain range of errors due to the influence of the manufacturing process, and those skilled in the art may consider these errors to be negligible.

It can be understood that, in some other possible examples, the length of the second portion 3222b is greater than the length of the first portion 3222a, and the second portion 3222b is located between the side sealing edge 322 and the side end surface 312 .

That is to say, when bending the second part 3222b, there is no need to impose strict requirements on the length of the second part 3222b, which can conveniently reduce the production difficulty of the battery 300 and improve the production efficiency of the battery 300 .

Referring to Fig. 3 and Fig. 3a, in an optional example of the embodiment of the present application, when the top sealing edge 321 is specifically arranged, the part of the second extension part 3212 close to the second main body part 3211 can be turned away from the top surface 311, the second extension part 3212 is bent toward the top end surface 311 near the first extension part 3222, so that when the second main body part 3211 is bent parallel to or approximately parallel to the top end surface 311, the second extension part 3212 can The transition to the connection with the first extension part 3222 is more smooth, so as to prevent the second extension part 3212 from being damaged due to excessive bending.

For example, referring to Fig. 3 and Fig. 3a, the second extension part 3212 includes a third part 3212a and a fourth part 3212b, one end of the third part 3212a is connected with the second main body part 3211, and the other end of the third part 3212a is connected with the second part 3212a. The four parts 3212b are connected, that is, the third part 3212a is located between the second main part 3211 and the fourth part 3212b.

Wherein, the fourth portion 3212b is connected to the first extension portion 3222 , wherein the third portion 3212a is bent away from the top surface 311 , and the fourth portion 3212b is bent toward the top surface 311 . Referring to Fig. 3a, for example, the fourth part 3212b may include two parts, wherein one part (shown with reference to m in Fig. 3a) is set opposite to the second part 3222b, and the other part (refer to n in Fig. 3a shown) is connected to the side of the second portion 3222b facing away from the end face.

Referring to FIG. 3 a , the second extension portion 3212 is specifically connected to the second portion 3222 b of the first extension portion 3222 .

Referring to FIG. 4 , in another optional example of the embodiment of the present application, the second extension 3212 of the top edge 321 can be flattened on the top surface 311 , and the second extension 3212 and the first extension The second part 3222b of 3222 is connected.

Referring to FIG. 3 and FIG. 4 , the angle α between the second extension portion 3212 and the second main body portion 3211 is 80-170 degrees. It can be understood that the angle α between the second extension part 3212 and the second main part 3211 refers to the plane where the part of the second extension part 3212 close to and connected to the second main part 3211 is located and the second main part 3211. The angle between the planes of .

For example, referring to FIG. 3 , in the example corresponding to FIG. 3 , the first surface of the third part 3212a The included angle α between the plane where the second surface of the second body part 3211 is located (refer to a in FIG. 3 ) and the plane where the second surface of the second body part 3211 is located (refer to c in FIG. 3 ) is 80-170 degrees.

It should be noted that the first surface a of the third part 3212a refers to the side surface of the third part 3212a facing away from the top end surface 311, and the second surface c of the second main body part 3211 refers to the side surface of the second main body part 3211 facing away from the top end. One side surface of the surface 311.

In this way, the second extension part 3212 can be prevented from interfering with the battery cell 310 after being folded, that is, the size of the battery cell 310 can be increased as much as possible, and the capacitance of the battery cell 310 can be increased, thereby increasing the battery life of the electronic device 10 . In some specific examples, the included angle α may be 80 degrees, 120 degrees, 150 degrees or 170 degrees, etc., which may be adjusted according to actual needs.

Referring to FIG. 3 , in an optional design, the angle β between the second main body portion 3211 and the second portion 3222b is 90-170 degrees. It can be understood that the angle β between the second body part 3211 and the second part 3222b refers to the angle between the plane where the second body part 3211 is located and the plane where the second part 3222b is located.

For example, the plane where the side of the second body part 3211 facing away from the top surface 311 (that is, the second surface of the second body part 3211) is located (refer to c in FIG. The angle β between the planes where the sides are located (refer to d shown in FIG. 3 ) is 90-170 degrees.

Exemplarily, the included angle β between the second main body portion 3211 and the second portion 3222b may be a suitable angle value such as 90 degrees, 100 degrees, 135 degrees or 170 degrees, and may be specifically adjusted as required.

It can be understood that when the second part 3222b is parallel to (for example attached to) the first part 3222a, the angle β between the second part 3222b and the second main body part 3211 may be (or approximately) 90 degrees, when There is a certain included angle between the second part 3222b and the first part 3222a. For example, when there is a certain gap between the second part 3222b and the first part 3222a, the included angle β between the second part 3222b and the second main body part 3211 is greater than 90 degrees, and as the angle between the second portion 3222b and the first portion 3222a increases, the angle β between the second portion 3222b and the second main body portion 3211 becomes larger.

That is to say, after the second main body part 3211 is folded onto the top end surface 311 and the first main body part 3221 is folded onto the side end surface 312, the second part 3222b can be in close contact with the first part 3222a, or there can be a certain clip. The corner, that is, the second part 3222b may have a certain gap with the first part 3222a, so that the transition between the second main body part 3211 and the second part 3222b is more convenient, and the folding of the second part 3222b is facilitated.

Usually the shell 320 formed by the aluminum-plastic film or the top sealing edge 321 and the side sealing edge 322 all have a certain thickness of. In order to ensure that the top sealing edge 321 and the side sealing edge 322 of the cell 310 in the battery 300 provided in the embodiment of the present application can be folded smoothly. In some optional examples, the included angle between the second portion 3222b and the second extension portion 3212 may be set to 0-45 degrees. In this way, the transition at the knuckle between the top sealing edge 321 and the side sealing edge 322 can be facilitated, and the folding of multiple top sealing edges 321 and side sealing edges 322 can be facilitated.

Referring to Fig. 3a, in the embodiment of the present application, the angle γ between the second portion 3222b and the second extension portion 3212 is 0-45 degrees. It can be understood that the included angle γ between the second part 3222b and the second extension part 3212 refers to at least part of the surface of the plane where the second part 3222b is located and the second extension part 3212 that is close to and connected to the second part 3222b The angle between the planes.

For example, as shown in Figure 3a, the angle γ between the plane where the second part 3222b is located (shown with reference to d in Figure 3a) and the plane where a part n of the fourth part 3212b is located (shown with reference to e in Figure 3a) is 0-45 degrees. It can be understood that a part n of the fourth part 3212b is close to the second part 3222b and connected with the second part 3222b.

Exemplarily, the included angle γ between the second part 3222b and the second extension part 3212 (for example, the fourth part 3212b) can be a suitable angle value such as 0 degrees, 20 degrees, 30 degrees or 45 degrees, which can be determined according to actual conditions. Adjustments are required.

It can be understood that when the second extension part 3212 is attached to the second part 3222b, the angle between the second extension part 3212 and the second part 3222b is 0 degrees, that is, the e-plane in the second extension part 3212 and the The d-plane of the second part 3222b is in contact with each other, so the angle between the e-plane in the second extension part 3212 and the d-plane of the second part 3222b is 0 degree. For example, as shown in FIG. 3a, when the two parts m and n of the fourth part 3212b are bent to stick to the surface of the second part 3222b, it can be understood as the gap between the second extension part 3212 and the second part 3222b. The included angle is 0 degrees.

Referring to FIG. 4 , the side surface of the second extension part 3212 facing the side sealing edge 322 is bent to attach to the second part 3222b, and the angle between the second extension part 3212 and the second part 3222b is 0. Spend.

For another example, as shown in FIG. 3a, the angle γ between the plane e where a part of the fourth part 3212b (shown by n in FIG. 3a) and the plane d where the second part 3222b is located is greater than 0 degrees, approximately 45 degrees, it can be understood that the angle between the second extension part 3212 and the second part 3222b is greater than 0 degrees.

By setting the angle γ between the second part 3222b and the second extension part 3212 to be 0-45 degrees, it can be ensured that the bent corners of the top sealing edge 321 and the side sealing edge 322 will not occupy the width direction of the battery 300. More space, thereby reducing the width of the battery 300, can increase the width of the battery cell 310 during installation, so that the capacity of the battery cell 310 can be improved.

It should be noted that, in order to avoid recovery or warping of the top sealing edge 321 after bending, an adhesive layer can be provided between the top sealing edge 321 and the top surface 311 of the battery cell 310, and the top sealing edge 321 can be sealed by the adhesive layer. to fix.

Wherein, the adhesive layer may be formed on the top surface 311 of the battery cell 310 by dispensing glue, or formed on the surface facing/towards the side of the battery cell 310 after the top sealing edge 321 is folded by dispensing.

It should be noted that the adhesive layer can also be formed on the battery cell 310 by sticking an insulating tape on the surface facing the battery cell 310 after the top end surface 311 or the top sealing edge 321 of the battery cell 310 is folded. .

Fig. 11 is a schematic diagram of the structure of the cell and the protective plate in the battery provided by the embodiment of the present application, and Fig. 12 is a schematic diagram of another structure of the cell and the protective plate in the battery provided by the embodiment of the present application.

11 and 12, generally, the battery 300 also includes a protective plate 330 and a tab 340, the protective plate 330 is electrically connected to the battery cell 310 through the tab 340, and the protective plate is located on a side of the top sealing edge 321 away from the top surface 311. side.

Wherein, the protective plate 330 may be provided with a plurality of electronic components, wherein the protective plate 330 is electrically connected to the tab 340 of the battery cell 310, and in addition, the protective plate 330 is used to communicate with external devices (such as Electric electronic equipment 10 or charging equipment, etc.) are electrically connected. The main function of the protection board 330 is to prevent the battery 300 from overcharging during the charging process of the battery 300. When the external charging device continues to charge the battery 300 and the inside of the battery 300 reaches a saturated state, the internal circuit of the lithium protection board 330 will be automatically cut off, thereby Can avoid overcharging.

Of course, the protection board 330 also has other functions, such as protecting the battery 300 from over-discharging. When the battery 300 is over-discharging, the discharge circuit on the protection board 330 will be automatically cut off, which can ensure that the battery 300 will not be fully discharged. Of course, it can also ensure The internal current of the battery 300 is stable to avoid overheating of the lithium battery 300 during discharge.

In addition, in some examples, the protective plate 330 can also isolate a plurality of lithium batteries 300 to avoid the occurrence of a short circuit.

It can be understood that the protective plate 330 also has some other functions, and the function of the aforementioned protective plate 330 is only It is illustrated as some examples, and the function of the protection plate 330 in the embodiment of the present application is not limited.

Wherein, one end of the tab 340 is connected to the battery core 310 , and the other end of the tab 340 is connected to the nickel sheet on the protective plate 330 . Specifically, the tab 340 and the nickel sheet on the protective plate 330 may be connected by spot welding or soldering.

It can be understood that an insulating protective layer may be provided at the welding place between the tab 340 and the protective plate 330 to insulate the welding place, so as to avoid a short circuit.

Wherein, as shown in FIG. 12 , the surface of the protective plate 330 is opposite to the top surface 311 may mean that the surface of the protective plate 330 is parallel or approximately parallel to the top surface 311 .

It can be understood that the surface of the protection board 330 is usually provided with a plurality of electronic components, that is to say, the plurality of electronic components usually protrude from the surface of the protection board 330 . In the embodiment of the present application, both ends of the protection board 330 can be connected with the protrusions 323 in the foregoing embodiments, and multiple electronic components on the protection board 330 can be located between the two protrusions 323. In addition, the plurality of electronic components The elements may be arranged toward/facing the direction of the battery cell 310 .

In this way, the electronic components protruding from the surface of the protective plate 330 can be accommodated or hidden between the two first extensions 3222, and the space occupied by the electronic components can be reduced. In some cases, the size or volume of the battery cell 310 can be effectively increased, and the capacitance of the battery cell 310 can be increased; that is, the battery life of the electronic device 10 can be improved.

In an optional example, the height of the first portion 3222a protruding from the outer surface of the top sealing edge 321 is less than or equal to the thickness of the protective plate 330 .

That is to say, in the embodiment of the present application, after the second part 3222b is folded, the first part 3222a will not exceed the surface of the protective plate 330 facing away from the top sealing edge 321 . In this way, the thickness of the protective plate 330 can be used to isolate/separate the end of the first portion 3222a from the metal in the battery 300 , thereby avoiding short circuits and improving the safety of the battery 300 .

In some optional design manners, along the width direction of the battery 300 , the protective plate 330 and the first extension portion 3222 are arranged side by side. That is to say, in the embodiment of the present application, the protective plate 330 is located between the two first extensions 3222, so that the protective plate 330 will not be supported by the first extensions 3222, that is, the protective plate 330 can be reduced along the length of the battery. The space occupied by the height direction of the battery 300 can effectively increase the energy density of the battery 300 .

Fig. 13 is another structural schematic diagram of the cooperation between the cell and the casing in the battery provided by the embodiment of the present application.

Referring to FIG. 13 , in the embodiment of the present application, a compressible medium 350 is filled between the protection plate 330 and the battery core 310 , and the compressible medium 350 is in contact with the top surface 311 and the protection plate 330 respectively.

Specifically, the compressible medium 350 can be compressible foam glue, such as single-sided compressible foam glue or double-sided compressible foam glue, etc. The compressible medium 350 is filled between the protective plate 330 and the battery core 310, and can The compression medium 350 can play the role of insulation and limit fixation. For example, after the protective plate 330 is pressed onto the compressible medium 350 , the compressible medium 350 can support the nickel sheet on the protective plate 330 , making the connection between the protective plate 330 and the tab 340 more stable and reliable. In addition, filling the compressible medium 350 between the protective plate 330 and the battery core 310 can also play a role of cushioning and shock absorption for the electronic components on the protective plate 330 , and can effectively protect the electronic components on the protective plate 330 from being damaged.

It can be understood that, in a specific setting, the compressible medium 350 may be filled between the protection plate 330 and the top edge seal 321 .

Wherein, when specifically setting the compressible medium 350, the compressible medium 350 may be attached to the surface of the top sealing edge 321 after the top sealing edge 321 is folded, and after the protective plate 330 is connected with the tab 340, through The tab 340 is folded so that the protective plate 330 is pressed/bonded to the compressible medium 350 , so as to realize the connection and fixation of the protective plate 330 .

Of course, in some possible examples, it is also possible to connect the protective plate 330 with the tab 340 first, and then attach the compressible medium 350 on the surface of the protective plate 330 or the surface of the top sealing edge 321, and fold it in the above-mentioned manner The tab 340 realizes the connection and fixation of the protective plate 330 .

Figure 14 is a schematic structural view of the connection between the protective plate and the tab in the battery provided by the embodiment of the present application, and Figure 15 is another schematic structural view of the connection between the protective plate and the tab in the battery provided by the embodiment of the present application. 16 is another structural schematic diagram of the connection between the protective plate and the tab in the battery provided by the embodiment of the present application, and FIG. 17 is another structural schematic diagram of the connection between the protective plate and the tab 340 in the battery provided by the embodiment of the present application.

As described in detail in the foregoing embodiments, in the embodiment of the present application, the protective plate 330 is electrically connected to the battery cell 310 through the tab 340 . In order to reduce the space occupied by the protective plate 330 along the length direction of the electric core 310, the plate surface of the protective plate 330 is set to be parallel to or approximate to the end surface of the electric core 310 (such as the top end surface 311 described in the foregoing embodiments). parallel. In this way, the tab 340 needs to be bent. 14-17, in an optional example of the present application, the tab 340 includes a first connection section 341 and a second connection section 342, and the second connection section 342 is connected to the battery cell through the first connection section 341. 310 connection, The second connecting section 342 is used for connecting with the protective plate 330 .

Specifically, in the embodiment of the present application, the positive and negative tabs 340 may be bent after the first sub-edge is folded or the second sub-edge is folded, for example, the positive and negative tabs 340 are bent Make the protruding direction of the positive and negative tabs 340 consistent with the length direction of the battery cell 310, and then trim the length of the positive and negative tabs 340 to ensure that the tabs 340 of appropriate length are connected to the nickel sheet on the protective plate 330 . After the nickel sheets of the protective plate 330 are connected, the protective plate 330 is folded to be parallel or approximately parallel to the top surface 311 of the battery cell 310 , thereby forming the first connecting section 341 and the second connecting section 342 . Specifically, the second connection section 342 is a part connected with the nickel sheet on the battery 300 board shield.

Wherein, referring to FIG. 14 and FIG. 15 , after the protective plate 330 is installed on the end surface of the electric core 310, the connection between the tab 340 and the protective plate 330 can face/face one side of the electric core 310; The specific length of 340 can be folded in two ways according to Fig. 14 and Fig. 15 respectively. For example, the tab 340 is folded once in FIG. 14 , or the tab 340 is folded twice in FIG. 15 .

In other examples, as shown in FIG. 16 and FIG. 17 , after the protective plate 330 is installed on the end surface of the battery cell 310 , the connection between the tab 340 and the protective plate 330 may face/away from one side of the battery core 310 . side; according to the specific length of the tab 340, it can be folded in two ways according to Fig. 16 and Fig. 17 respectively. For example, the tab 340 is folded once in FIG. 16 , or the tab 340 is folded twice in FIG. 17 .

It should be noted that when the tab 340 is folded, the bending point of the tab 340 shrinks inwards on the surface of the cell 310 , that is to say, the projection of the tab 340 on the plane where the top surface 311 is located is located on the top surface 311 Inside. Specifically, referring to FIG. 14 , the thickness direction of the battery 300 may refer to the z direction in FIG. 14 . In this way, the bent portion of the tab 340 will not protrude from the battery cell 310 , which can avoid damage to the tab 340 caused by the battery 300 during transportation. For example, the first connection section 341 of the tab 340 is located inside the surface of the battery 300 .

It should be noted that the surface of the battery cell 310 refers to any one of the two opposing surfaces of the battery cell 310 along the thickness direction. Referring to FIG. 14 , for the convenience of description, the battery cell 310 may include a first surface f and a second surface g opposite to each other along the thickness direction (refer to the z direction in FIG. 14 ), and the top sealing edge 321 faces the first surface f. bent. Wherein, the tab 340 is located on one side of the top surface 311 between the first surface f and the second surface g.

In some specific examples, the distance between the first connecting section 341 and the surface of the battery is greater than or equal to 0.2 mm. For example, the distance between the side of the first connecting section 341 close to the first surface f and the first surface f (shown with reference to d1 in FIG. 14 ) is greater than or equal to 0.2mm, for example, d1 can be 0.2mm, 0.3mm or Appropriate values such as 0.4mm can be adjusted according to the actual situation.

Alternatively, the distance between the side of the first connecting segment 341 close to the second surface g and the second surface g (refer to d2 in FIG. 14 ) is greater than or equal to 0.2mm, for example, d2 can be 0.2mm, 0.3mm or 0.4mm and other appropriate values, which can be adjusted according to the actual situation.

In this way, sufficient safety space can be provided for the tab 340 , and the tab 340 can be effectively protected from being damaged.

Referring to FIG. 18 , in other optional examples of the present application, an insulating layer 360 is attached to the side of the protective plate 330 facing away from the battery core 310 , at least part of the insulating layer 360 covers the protective plate 330 , and the insulating layer The other part of 360 is connected with the battery core 310 to fix the protective plate 330 .

Specifically, in the embodiment of the present application, the insulating layer 360 can be an insulating tape, that is, after the protective plate 330 and the battery cell 310 are installed together, the insulating layer 330 can be reused on the surface of the protective plate 330 facing away from the battery core 310. Adhesive tape for protection. In some possible examples, the insulating layer 360 may also be a polyimide film (Polyimide Film, PI for short) or a polyester film (PET).

In the description of this application, it should be understood that the terms "centre", "length", "width", "thickness", "top", "bottom", "upper", "lower", " "Left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", etc. indicate the orientation or positional relationship based on the drawings The orientation or positional relationship shown is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the referred position or element must have a specific orientation, a specific configuration and operation, so it cannot be understood as a limitation to the application. limit.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In this application, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation" and so on should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or Become one; may be connected mechanically or electrically or may communicate with each other; may be direct Connected, can also be indirectly connected through an intermediary, can make the internal communication of two elements or the interaction relationship between two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

In this application, unless otherwise expressly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present application. scope.

Claims

A battery, characterized in that it includes: a battery cell and a casing,

The outer shell is located on the outer periphery of the electric core, and the outer shell is formed with a top sealing edge and a side sealing edge at the edge of the electric core;

Wherein, the side sealing edge includes a first main body part and a first extension part, the first main body part is located on the side end surface of the battery, the side end surface is the end surface of the battery along the width direction, and the first The main body is bent toward the side end surface; along the height direction of the battery, the first extension part extends out of the top end surface of the battery, the top end surface is the end surface of the battery along the height direction, and the first extension part At least a partial area of an extension part is bent toward the first main body part, and is located on a side of the side sealing edge facing the side end surface.
The battery according to claim 1, characterized in that, along the width direction of the battery cell, the top sealing edge includes a second main body part and a second extension part, and the second main body part is located on the side of the battery cell The top end surface, and the second main body is bent toward the top end surface; the second extension part is connected to the first extension part.
The battery according to claim 2, wherein the first extension portion includes a first portion and a second portion, the second portion is bent toward the first main body portion, and the second portion is located on the between the first portion and the second extension.
The battery according to claim 3, wherein the second extension portion includes a third portion and a fourth portion; the third portion is located between the fourth portion and the second main body, the The fourth part is connected to the second part.
The battery according to claim 4, wherein the third portion is bent away from the top end surface, and the fourth portion is bent toward the top end surface.
The battery according to claim 3, wherein at least part of the second extension part is flat on the top surface, and the second extension part is connected to the second part.
The battery according to claim 3, wherein the angle between the second extension part and the second main body is 80-170 degrees.
The battery according to claim 3, wherein the angle between the second main body and the second part is 90-170 degrees.
The battery according to claim 3, wherein the angle between the second portion and the second extension is 0-45 degrees.
The battery according to any one of claims 3-9, wherein the length of the second portion is less than or equal to the length of the first portion.
The battery according to any one of claims 3-9, wherein the length of the second part is 0.5-10.0 mm, and/or,

The height of the first part along the height direction of the cell is 0-10mm.
The battery according to any one of claims 3-9, wherein the length of the second part is greater than the length of the first part, and the second part is located at the side sealing edge and the side end surface between.
The battery according to any one of claims 1-9, wherein the battery further comprises a protective plate and a tab, the protective plate is electrically connected to the battery cell through the tab, and the protective plate It is located on the side of the top sealing edge away from the top surface.
The battery according to claim 13, wherein the first extension portion comprises a first portion and a second portion, the second portion being bent toward the first body portion;

The height of the first portion extending beyond the outer surface of the top sealing edge is less than or equal to the thickness of the protective plate.
The battery according to claim 14, characterized in that, along the width direction of the battery, the protective plate and the first extension part are arranged in a staggered manner.
The battery according to claim 13, wherein the tab comprises a first connection section and a second connection section, the second connection section is connected to the battery cell through the first connection section, the The second connecting section is used for connecting with the protection board.
The battery according to claim 16, wherein the projection of the tab on the plane where the top surface is located is located in the top surface; wherein the battery cell includes a first surface and a second surface opposite to each other in the thickness direction. surface, the top sealing edge is bent towards the first surface;

The distance between the side of the first connecting section close to the first surface and the first surface is greater than or equal to 0.2 mm, or, the side of the first connecting section close to the second surface and the second surface The distance between them is greater than or equal to 0.2mm.
The battery according to claim 13, characterized in that, the connection between the protection plate and the tab faces the battery cell, or the connection between the protection plate and the tab faces away from the battery. core.
The battery according to claim 13, wherein the protective plate and the battery cell A compressible medium is filled therebetween, and the compressible medium is in contact with the first main body part and the protective plate respectively.
The battery according to claim 13, wherein the battery further comprises an insulating layer;

A part of the insulating layer is attached to the outer surface of the protective plate, and another part of the insulating layer is attached to the electric core.