Battery and electronic device

Abstract

The present disclosure provides a battery and an electronic device, and relates to the technical field of batteries. The battery comprises a protection circuit board, a connecting structure, and first and second battery cells arranged side by side. The protection circuit board is located on the same side of the first and second battery cells and parallel to the top surface of the first and second battery cells. The first battery cell comprises a first metal shell, a first positive electrode connecting part and a first negative electrode connecting part, and the first positive electrode connecting part is connected to the protection circuit board. The second battery cell comprises a second metal shell, a second positive electrode connecting part and a second negative electrode connecting part, and the second negative electrode connecting part is connected to the protection circuit board. The connecting structure is connected to the first negative electrode connecting part and the second positive electrode connecting part, respectively. In the present disclosure, when only one protection circuit board is provided, the protection circuit board will not be blocked by the top sealing bending part, so that the protection circuit board does not need to be arranged outside the top sealing bending part, thereby the space of the battery can be saved to improve the capacity of the battery.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular to a battery and an electronic device. Background Technology

[0002] In electronic devices, protection circuit boards are widely used to protect batteries.

[0003] In related technologies, pouch batteries are commonly used in electronic devices. In pouch batteries, the head of the cell has two top-sealed bends, which are located on both sides of the cell and protrude relative to the cell body.

[0004] When a pouch battery has two cells, if only one protection circuit board is installed, the protection circuit board needs to be placed outside the top seal bend due to the interference of the top seal bend, which will occupy more space. This will reduce the available space of the cells and make it impossible to obtain a larger battery capacity. Utility Model Content

[0005] This disclosure provides a battery and an electronic device that can solve the aforementioned technical problems existing in related technologies. The technical solution is as follows: In a first aspect, a battery is provided, the battery comprising a protection circuit board, a connection structure, and a first battery cell and a second battery cell arranged side by side; The protection circuit board is located on the same side of the first battery cell and the second battery cell, and is parallel to the top surface of the first battery cell and the second battery cell; The first battery cell includes a first metal casing, a first positive electrode connection portion and a first negative electrode connection portion, wherein the first positive electrode connection portion is connected to the protection circuit board; The second battery cell includes a second metal casing, a second positive electrode connection portion, and a second negative electrode connection portion, wherein the second negative electrode connection portion is connected to the protection circuit board; The connection structure is connected to the first negative electrode connection part and the second positive electrode connection part, respectively.

[0006] In some possible embodiments, the connection structure is a flexible circuit board.

[0007] In some possible embodiments, the battery includes a plurality of electronic components, at least one of the electronic components being located on the flexible circuit board; The electronic components include at least one of a control chip, a resistor, and a MOSFET.

[0008] In some possible embodiments, the surface where the first negative electrode connection is located is opposite to the surface where the second positive electrode connection is located.

[0009] In some possible embodiments, the orthographic projection of the first negative electrode connection portion onto a designated plane does not coincide with the orthographic projection of the second positive electrode connection portion onto the designated plane, wherein the designated plane is a plane perpendicular to the arrangement direction of the first and second battery cells.

[0010] In some possible embodiments, the first metal housing includes a first shell and a first cover plate connected together, the first cover plate forming a first flange edge with the outer periphery of the first shell, and the height of the first negative electrode connection relative to the first shell being less than or equal to the height of the first flange edge relative to the first shell; and / or, The second metal casing includes a second housing and a second cover plate connected together. The second cover plate and the outer periphery of the second housing form a second flange edge. The height of the second positive electrode connection relative to the second housing is less than or equal to the height of the second flange edge relative to the second housing.

[0011] In some possible embodiments, the first negative electrode connection is located on the surface of the first cell away from the protective circuit board; and / or, The second positive electrode connection is located on the surface of the second cell away from the protective circuit board.

[0012] In some possible embodiments, the first metal housing includes a first housing and a first cover plate connected together, the first cover plate forming a first flange edge with the outer periphery of the first housing, and the height of the first positive electrode connection relative to the first housing is less than or equal to the height of the first flange edge relative to the first housing; and / or, The second metal casing includes a second housing and a second cover plate connected together. The second cover plate and the outer periphery of the second housing form a second flange edge. The height of the second negative electrode connection relative to the second housing is less than or equal to the height of the second flange edge relative to the second housing.

[0013] In some possible embodiments, the first negative electrode connection is formed on the first metal casing; The second negative electrode connection portion is formed on the second metal casing.

[0014] In some possible embodiments, the first negative electrode connection portion is a first solder pad, and the first solder pad is connected to the first metal casing; and / or, The second negative electrode connection part is a second solder pad, and the second solder pad is connected to the second metal shell.

[0015] In a second aspect, an electronic device is provided, the electronic device comprising a battery provided in the first aspect and its possible implementations.

[0016] The beneficial effects of the technical solution provided in this disclosure include at least the following: Both the first and second cells have metal casings. Compared to pouch batteries, metal-cased batteries do not have a top-sealed bend. When only one protection circuit board is installed, the protection circuit board will not be blocked by the top-sealed bend, thus eliminating the need to place the protection circuit board outside the top-sealed bend, thereby saving battery space and increasing battery capacity.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a battery provided in an embodiment of this disclosure; Figure 2 This is a schematic diagram of another battery structure provided in an embodiment of this disclosure; Figure 3 This is a schematic diagram of the structure of another battery provided in this disclosure embodiment; Figure 4 This is a schematic diagram of the structure of another battery provided in an embodiment of this disclosure; Figure 5 This is a side view of a battery provided in an embodiment of this disclosure; Figure 6 This is a schematic diagram of the metal casing of a battery cell provided in an embodiment of this disclosure; Figure 7 This is a schematic diagram of the structure of a battery in related technologies; Figure 8 This is a schematic diagram of the structure of a dual-cell battery in related technologies.

[0020] Figure label: 1. Protective circuit board; 11. PCB board; 12. Flexible circuit board; 13. Electrical components; 14. Injection molding material layer; 15. Nickel sheet; 16. Connector; 2. First battery cell; 20. First metal casing; 201. First housing; 202. First cover plate; 203. First flange edge; 21. First positive electrode connection part; 22. First negative electrode connection part; 3. Second battery cell; 30. Second metal casing; 301. Second housing; 302. Second cover plate; 303. Second flange edge; 31. Second positive electrode connection part; 32. Second negative electrode connection part; 4. Connection structure; 5. Electronic components. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other. This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] In electronic devices, protection circuit boards are widely used to protect batteries.

[0024] In related technologies, pouch batteries are commonly used in electronic devices. For example... Figure 7 As shown, in a pouch cell, two top-sealing bends are formed at the top of the cell. The two top-sealing bends are located on both sides of the cell and protrude relative to the cell body.

[0025] like Figure 7 As shown, when a pouch battery has one cell, the protection circuit board can be placed between the two top seal bends to reduce the installation space required for the protection circuit board; however, as Figure 8 As shown, when a pouch battery has two cells, if only one protection circuit board is installed, the protection circuit board needs to be placed outside the top seal bend because of the obstruction of the top seal bend on the side where the two cells are close to each other. This will result in a serious waste of battery space.

[0026] To address the aforementioned technical problems, this disclosure provides a battery. For example... Figure 1 As shown, the battery includes a protection circuit board 1, a connection structure 4, and a first battery cell 2 and a second battery cell 3 arranged side by side. The protection circuit board 1 is located on the same side as the first battery cell 2 and the second battery cell 3. The first battery cell 2 includes a first metal casing 20, a first positive electrode connection portion 21, and a first negative electrode connection portion 22, with the first positive electrode connection portion 21 connected to the protection circuit board 1. The second battery cell 3 includes a second metal casing 30, a second positive electrode connection portion 31, and a second negative electrode connection portion 32, with the second negative electrode connection portion 32 connected to the protection circuit board 1. The connection structure 4 is connected to both the first negative electrode connection portion 22 and the second positive electrode connection portion 31.

[0027] The battery provided in this embodiment has a metal casing for both the first cell 2 and the second cell 3. Compared to a pouch battery, the metal casing battery does not have a top sealing bend. When only one protection circuit board 1 is provided, the protection circuit board 1 will not be blocked by the top sealing bend, so it is not necessary to place the protection circuit board 1 outside the top sealing bend, thereby saving battery space and increasing battery capacity.

[0028] Furthermore, the first negative electrode connection 22 is connected to the second positive electrode connection 31, and the protection circuit board 1 is only connected to the first positive electrode connection 21 and the second negative electrode connection 32 through the connection structure 4. Compared with the scheme in which the first positive electrode connection 21, the first negative electrode connection 22, the second positive electrode connection 31 and the second negative electrode connection 32 are respectively connected to the protection circuit board 1, the internal wiring of the protection circuit board 1 can be simplified, thereby reducing the size (thickness) of the protection circuit board 1. In this way, the size of the first cell 2 and the second cell 3 can be increased without changing the overall size of the battery, so as to increase the battery capacity.

[0029] In this circuit, one surface of the protection circuit board 1 perpendicular to the thickness direction is connected to the first positive electrode connection part 21 and the second negative electrode connection part 32. That is, the protection circuit board 1 is placed horizontally, which can prevent the protection circuit board 1 from occupying too much battery space at the head of the cell.

[0030] Combination Figure 1 , Figure 5 As shown, the protective circuit board 1 includes a PCB board 11, a flexible circuit connection board 12, electrical components 13, an injection molding material layer 14, nickel sheets 15, and connectors 16. The flexible circuit connection board 12 and the electrical components 13 are located on opposite sides of the PCB board 11. Two nickel sheets 15 are disposed on the surface of the flexible circuit connection board 12 near the first battery cell 2 and the second battery cell 3. These two nickel sheets 15 are soldered and fixed to the first positive electrode connection portion 21 and the second negative electrode connection portion 32, respectively, to connect the protective circuit board 1 to the two battery cells. Connectors 16 are disposed at both ends of the flexible circuit connection board 12 to connect the protective circuit board 1 to other circuits of the electronic device. The side of the PCB board 11 away from the first battery cell 2 and the second battery cell 3 is also filled with an injection molding material layer 14 to protect the electrical components 13.

[0031] like Figure 5As shown, the first metal casing 20 of the first battery cell 2 includes a first housing 201 and a first cover plate 202 connected together. The first housing 201 has a receiving groove for containing materials such as electrolyte and electrodes. The first cover plate 202 is placed over the opening of the receiving groove to close it. During the assembly of the first battery cell 2, in order to ensure that the first cover plate 202 can close the receiving groove, the size of the first cover plate 202 is slightly larger than the opening size of the receiving groove. Thus, after the first cover plate 202 is connected to the first housing 201, the first cover plate 202 and the outer periphery of the first housing 201 form a first flange edge 203. Similarly, the second metal casing 30 includes a second housing 301 and a second cover plate 302 connected together. After the second cover plate 302 is connected to the second housing 301, the second cover plate 302 and the outer periphery of the second housing 301 form a second flange edge 303.

[0032] Optionally, the metal casing is a steel casing, meaning the battery is a steel-cased battery.

[0033] like Figures 1 to 3 As shown in any of the accompanying drawings, in some embodiments, the connection structure 4 is a flexible circuit board.

[0034] Among them, the flexible circuit board has a small size. By using the flexible circuit board, the connection between the first negative electrode connection part 22 and the second positive electrode connection part 31 can be realized in a relatively limited space. This avoids the connection structure between the first negative electrode connection part 22 and the second positive electrode connection part 31 occupying a large space, so as to ensure that the battery cell has a large size.

[0035] Of course, the connection structure 4 can also be a wire or other conductive structure, and this disclosure does not limit this.

[0036] like Figure 2 or Figure 3 As shown, in some embodiments, the battery includes multiple electronic components 5, at least one of which is located on a flexible circuit board (connection structure 4). The electronic component 5 includes at least one of a control chip, a resistor, and a MOSFET.

[0037] Thus, by placing some electronic components 5 on the connection structure 4, the number of electronic devices on the protection circuit board 1 can be reduced, thereby reducing the overall size (thickness) of the protection circuit board 1 and saving battery space to increase battery capacity. Furthermore, the connection structure 4 can also be used to house some heat-generating devices, reducing the number of heat-generating devices on the protection circuit board 1 and dispersing the battery's heat source, thus reducing heat generation at the battery head. In addition, through proper arrangement, the charging and discharging current paths of the first cell 2 and the second cell 3 can be optimized, improving the charging speed.

[0038] Optionally, electronic component 5 includes at least one of a control chip, a resistor, and a switching transistor.

[0039] In the case of a protection circuit with multiple protection levels, one of the protection levels can be placed on the connection structure 4.

[0040] like Figure 2 or Figure 3 As shown, in some embodiments, the surface where the first negative electrode connection portion 22 is located is opposite to the surface where the second positive electrode connection portion 31 is located.

[0041] Among them, such as Figure 6 As shown, the first flange edge 203 occupies some space, often resulting in wasted battery space. Similarly, the second flange edge 303 also occupies some space, often resulting in wasted battery space.

[0042] In this embodiment, the surface where the first negative electrode connection 22 is located is opposite to the surface where the second positive electrode connection 31 is located, thereby making reasonable use of the battery space occupied by the first flange edge 203 and the second flange edge 303. This reduces the additional battery space occupied by the first negative electrode connection 22, the second positive electrode connection 31 and the connection structure 4, and can even prevent the first negative electrode connection 22, the second positive electrode connection 31 and the connection structure 4 from occupying additional battery space, thereby improving the battery space utilization rate and increasing the size of the battery cell.

[0043] exist Figure 2 In the battery shown, the first negative electrode connection 22 is opposite to the second positive electrode connection 31.

[0044] and Figure 2 The battery shown is different in that... Figure 3 In the battery shown, the orthographic projection of the first negative electrode connection 22 onto a designated plane does not coincide with the orthographic projection of the second positive electrode connection 31 onto a designated plane. The designated plane is a plane perpendicular to the arrangement direction of the first cell 2 and the second cell 3.

[0045] Thus, the first negative electrode connection 22 and the second positive electrode connection 31 are staggered, thereby increasing the length and thickness of the connection structure 4. That is, the size of the connection structure 4 can be increased without taking up extra space in the battery. This allows for the placement of more electronic components 5 on the connection structure 4, further reducing the number of electronic components 5 in the protection circuit board 1. Consequently, the size of the protection circuit board 1 can be further reduced, and the size of the first cell 2 and the second cell 3 can be increased while keeping the overall size of the battery unchanged, thereby further improving the battery capacity.

[0046] like Figures 1 to 3As shown in any of the accompanying drawings, in some embodiments, the height of the first negative electrode connection 22 relative to the first housing 201 is less than or equal to the height of the first flange edge 203 relative to the first housing 201, and the height of the second positive electrode connection 31 relative to the second housing 301 is less than or equal to the height of the second flange edge 303 relative to the second housing 301.

[0047] In this way, the first negative electrode connection 22 and the second positive electrode connection 31 can have a smaller height, thereby increasing the thickness of the connection structure 4 to improve the structural strength of the connection structure 4. Alternatively, more electronic components 5 can be provided on the connection structure 4, thereby reducing the number of electronic components 5 in the protection circuit board 1 and thus reducing the size of the protection circuit board 1. This allows for increasing the size of the first cell 2 and the second cell 3 while keeping the overall size of the battery unchanged, thereby further increasing the battery capacity.

[0048] Optionally, since the first metal casing 20 can serve as the negative electrode of the first battery cell 2, the minimum height of the first negative electrode connection portion 22 relative to the first casing 201 can be zero.

[0049] like Figure 4 As shown, in some embodiments, the first negative electrode connection portion 22 is located on the surface of the first cell 2 away from the protection circuit board 1, and the second positive electrode connection portion 31 is located on the surface of the second cell 3 away from the protection circuit board 1.

[0050] In this way, the first negative electrode connection part 22 can be prevented from occupying the space at the head of the first cell 2 and the second positive electrode connection part 31 can be prevented from occupying the space at the head of the second cell 3, so as to avoid the connection structure 4 from obstructing the connection of the protection circuit board 1. Furthermore, by reasonably setting the size of the first negative electrode connection part 22 and the second positive electrode connection part 31, the space occupied by the first flange edge 203 and the second flange edge 303 can be utilized, thereby enabling the installation of the first negative electrode connection part 22 and the second positive electrode connection part 31 without occupying additional battery space.

[0051] like Figures 1 to 3 As shown in any of the accompanying drawings, in some embodiments, the height of the first positive electrode connection 21 relative to the first housing 201 is less than or equal to the height of the first flange edge 203 relative to the first housing 201, and the height of the second negative electrode connection 32 relative to the second housing 301 is less than or equal to the height of the second flange edge 303 relative to the second housing 301.

[0052] In this way, the height of the first positive electrode connection 21 and the second negative electrode connection 32 can be reduced, and the distance from the protection circuit board 1 to the first housing 201 and the second housing 301 can be reduced. While keeping the overall size of the battery unchanged, the space required to install the protection circuit board 1 can be reduced, thereby increasing the size of the first housing 201 and the second housing 301, and thus increasing the capacity of the first cell 2 and the second cell 3, thereby increasing the battery capacity.

[0053] Optionally, since the second metal casing 30 can serve as the negative electrode of the second battery cell 3, the minimum height of the second negative electrode connection portion 32 relative to the second casing 301 can be zero.

[0054] In some embodiments, a first negative electrode connection portion 22 is formed on a first metal casing 20, and a second negative electrode connection portion 32 is formed on a second metal casing 30.

[0055] In this way, the first metal casing 20 can be used as the negative electrode connection part of the first cell 2 and the second metal casing 30 can be used as the negative electrode connection part of the second cell 3, thereby reducing the number of components in the battery and thus reducing the component cost of the battery.

[0056] Optionally, the first positive electrode connection portion 21 is partially embedded in the first metal shell 20, and an insulating material is filled between the first positive electrode connection portion 21 and the first metal shell 20; the second positive electrode connection portion 31 is partially embedded in the second metal shell 30, and an insulating material is filled between the second positive electrode connection portion 31 and the second metal shell 30.

[0057] Since the first metal casing 20 can serve as the negative electrode of the first battery cell 2, filling the space between the first positive electrode connection 21 and the first metal casing 20 with insulating material can prevent a short circuit between them, thereby improving the stability of the first battery cell 2 during use. Similarly, filling the space between the second positive electrode connection 31 and the second metal casing 30 with insulating material can prevent a short circuit between them, thereby improving the stability of the second battery cell 3 during use.

[0058] In some embodiments, the first negative electrode connection portion 22 is a first solder pad, which is connected to the first metal casing 20; the second negative electrode connection portion 32 is a second solder pad, which is connected to the second metal casing 30.

[0059] In this design, the first solder pad serves as the first negative electrode connection part 22, which can be positioned relative to the second positive electrode connection part 31, thus facilitating their connection. Similarly, the second solder pad serves as the second negative electrode connection part 32, which can be used to position the second cell 3 relative to the protection circuit board 1, thereby facilitating their connection. This technique significantly improves the ease of battery assembly.

[0060] Based on the same concept, this disclosure also provides an electronic device, which includes the battery mentioned above.

[0061] Alternatively, the electronic device may be, for example, but not limited to, a mobile phone or a tablet.

[0062] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0063] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A battery, characterized in that, The battery includes a protection circuit board, a connection structure, and a first battery cell and a second battery cell arranged side by side. The protection circuit board is located on the same side of the first battery cell and the second battery cell, and is parallel to the top surface of the first battery cell and the second battery cell; The first battery cell includes a first metal casing, a first positive electrode connection portion and a first negative electrode connection portion, wherein the first positive electrode connection portion is connected to the protection circuit board; The second battery cell includes a second metal casing, a second positive electrode connection portion, and a second negative electrode connection portion, wherein the second negative electrode connection portion is connected to the protection circuit board; The connection structure is connected to the first negative electrode connection part and the second positive electrode connection part, respectively.

2. The battery according to claim 1, characterized in that, The connection structure is a flexible circuit board.

3. The battery according to claim 2, characterized in that, The battery includes multiple electronic components, at least one of which is located on the flexible circuit board; The electronic components include at least one of a control chip, a resistor, and a MOSFET.

4. The battery according to claim 2, characterized in that, The surface where the first negative electrode connection is located is opposite to the surface where the second positive electrode connection is located.

5. The battery according to claim 4, characterized in that, The orthographic projection of the first negative electrode connection portion onto a designated plane does not coincide with the orthographic projection of the second positive electrode connection portion onto the designated plane, wherein the designated plane is a plane perpendicular to the arrangement direction of the first and second battery cells.

6. The battery according to claim 2, characterized in that, The first metal casing includes a first housing and a first cover plate connected together. The first cover plate and the outer periphery of the first housing form a first flange edge. The height of the first negative electrode connection portion relative to the first housing is less than or equal to the height of the first flange edge relative to the first housing; and / or, The second metal casing includes a second housing and a second cover plate connected together. The second cover plate and the outer periphery of the second housing form a second flange edge. The height of the second positive electrode connection relative to the second housing is less than or equal to the height of the second flange edge relative to the second housing.

7. The battery according to claim 1, characterized in that, The first negative terminal connection is located on the surface of the first battery cell away from the protective circuit board; and / or, The second positive electrode connection is located on the surface of the second cell away from the protective circuit board.

8. The battery according to claim 1, characterized in that, The first metal casing includes a first housing and a first cover plate connected together. The first cover plate and the outer periphery of the first housing form a first flange edge. The height of the first positive electrode connection relative to the first housing is less than or equal to the height of the first flange edge relative to the first housing; and / or, The second metal casing includes a second housing and a second cover plate connected together. The second cover plate and the outer periphery of the second housing form a second flange edge. The height of the second negative electrode connection relative to the second housing is less than or equal to the height of the second flange edge relative to the second housing.

9. The battery according to any one of claims 1-8, characterized in that, The first negative electrode connection portion is formed on the first metal casing; The second negative electrode connection portion is formed on the second metal casing.

10. The battery according to any one of claims 1-8, characterized in that, The first negative electrode connection portion is a first solder pad, and the first solder pad is connected to the first metal casing; and / or, The second negative electrode connection part is a second solder pad, and the second solder pad is connected to the second metal shell.

11. An electronic device, characterized in that, The electronic device includes the battery according to any one of claims 1-10.

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