Secondary battery and electric equipment

Abstract

The utility model discloses a secondary battery and electric equipment, and belongs to the technical field of batteries, the secondary battery disclosed by the application comprises a protection plate and a plurality of single batteries, the plurality of single batteries are arranged along a first direction, each single battery comprises a first edge part, and the first edge part is arranged between two adjacent single batteries; the battery cover extends along the thickness direction of the battery; the protection plate comprises a first connecting piece and a plurality of plate bodies, the plurality of plate bodies are arranged along a first direction, each plate body is connected with one single battery, the first connecting piece is arranged between two adjacent plate bodies and is connected with two adjacent plate bodies, and the first connecting piece is arched along the thickness direction of the battery so as to bypass the first edge part; according to the battery, the first connecting piece arching in the thickness direction of the battery is arranged, the containing space is reserved for the first edge part through arching of the first connecting piece so as to bypass the first edge part, damage operation such as grooving or cutting does not need to be conducted on the first connecting piece, and the through-flow performance of the first connecting piece can be effectively guaranteed.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a secondary battery and an electrical device. Background Art

[0002] Currently, due to the manufacturing process of batteries, bulges will occur at the joints of two single batteries. For the protection board that spans two single batteries, grooves often need to be dug at the joints to provide accommodation space for the bulges, which inevitably affects the performance of the battery protection board. For example, the current-carrying performance decreases due to insufficient wiring space. Summary of the Utility Model

[0003] Purpose of the Utility Model: This application develops a secondary battery and an electrical device, aiming to solve the technical problem that the current-carrying performance decreases due to grooving of the battery protection board in the prior art.

[0004] Technical Solution: In a first aspect, an embodiment of this application provides a secondary battery having intersecting first and second directions. The secondary battery includes:

[0005] A plurality of single batteries arranged along the first direction, where the second direction is the thickness direction of the single battery. The single battery includes a connected body portion and a first edge portion. The first edge portion is located between the body portions of two adjacent single batteries and extends along the second direction.

[0006] A protection board, which includes:

[0007] A plurality of board bodies arranged along the first direction, and each board body is electrically connected to one single battery.

[0008] A first connecting member disposed between two adjacent board bodies and respectively connected to the two adjacent board bodies. The first connecting member arches along the second direction to bypass the first edge portion.

[0009] In some embodiments, the first connecting member includes a first flexible circuit board.

[0010] In some embodiments, the single battery further includes a second edge portion connected to the body portion. The second edge portion is located on one side of the body portion in a third direction and extends along the first direction. The second edge portion is connected to the protection board. The third direction, the second direction, and the first direction intersect.

[0011] In a plane perpendicular to the second direction, at least a part of the orthographic projection of the protection board and the second edge portion coincides.

[0012] In some embodiments, at least one of the plate bodies includes:

[0013] A second flexible circuit board, which is connected to the first flexible circuit board;

[0014] A reinforcement member, which is connected to the second flexible circuit board, and the reinforcement member and the second flexible circuit board are arranged along the second direction.

[0015] In some embodiments, at least one of the plate bodies includes a first printed circuit board.

[0016] In some embodiments, a second connecting member is further included, which is connected to the first printed circuit board. Along the third direction, at least a part of the second connecting member is arranged on a side of the first printed circuit board away from the single battery, and the third direction, the second direction and the first direction intersect.

[0017] In some embodiments, the second connecting member includes a third flexible circuit board.

[0018] In some embodiments, the plate body includes:

[0019] Electrical components;

[0020] A sealing layer, which covers the electrical components, and the sealing layer has a minimum thickness of a mm, satisfying: 0.08 ≤ a ≤ 0.12.

[0021] In some embodiments, at least one of the plate bodies includes a second printed circuit board, and the second printed circuit board and the first printed circuit board are arranged along the first direction and are connected by the first flexible circuit board.

[0022] In a second aspect, an embodiment of the present application further provides an electrical device, including the secondary battery according to any one of the first aspect.

[0023] Beneficial effects: Compared with the prior art, a secondary battery provided by an embodiment of the present application includes a protection board and a plurality of single cells. The plurality of single cells are arranged in a first direction. The single cell includes a first edge portion, and the first edge portion is disposed between two adjacent single cells and extends in a second direction, i.e., the battery thickness direction. The protection board includes a first connecting member and a plurality of board bodies. The plurality of board bodies are arranged in the first direction, and each board body is connected to a single cell. The first connecting member is disposed between two adjacent board bodies, and both ends of the first connecting member in the first direction are respectively connected to the two adjacent board bodies. The first connecting member arches in the second direction, i.e., arches in the battery thickness direction, so as to bypass the first edge portion. The present application provides a first connecting member that arches in the battery thickness direction. By the arching of the first connecting member, a receiving space is left for the first edge portion to bypass the first edge portion, and no destructive operations such as grooving or cutting are required for the first connecting member, which can effectively ensure the current-carrying performance of the first connecting member. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 Is a perspective view of the secondary battery provided by the embodiment of the present application;

[0026] Figure 2 Is an exploded view of the secondary battery provided by the embodiment of the present application;

[0027] Figure 3 Is a perspective view of the first connecting member, the second flexible circuit board and the reinforcing member in the secondary battery provided by the embodiment of the present application;

[0028] Figure 4 Is a perspective view of the board body and the second connecting member in the secondary battery provided by the embodiment of the present application;

[0029] Figure 5 Is a perspective view of the first connecting member and the second printed circuit board in the secondary battery provided by the embodiment of the present application;

[0030] Figure 6 Is a perspective view of two adjacent single cells in the secondary battery provided by the embodiment of the present application;

[0031] Figure 7 Is Figure 6 A partial enlarged view of part A in

[0032] Figure 8Schematic cross-sectional structure diagram of the protection board, electrical component and sealing layer provided by the embodiment of the present application;

[0033] Reference numerals: 10, single cell; 11, body part; 12, first edge part; 13, second edge part; 20, protection board; 22, first connecting piece; 221, first flexible circuit board; 23, board body; 231, second flexible circuit board; 232, reinforcement; 233, second printed circuit board; 24, first printed circuit board; 25, electrical component; 26, sealing layer; 30, second connecting piece; 301, third flexible circuit board; X, first direction; Y, second direction; Z, third direction. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0035] A secondary battery provided by an embodiment of the present application includes a protection board 20 and a plurality of single cells 10. The plurality of single cells 10 are arranged along the first direction X. The single cell 10 includes a first edge part 12, and the first edge part 12 is arranged between two adjacent single cells 10 and extends along the second direction Y, that is, the battery thickness direction; the protection board 20 includes a first connecting piece 22 and a plurality of board bodies 23. The plurality of board bodies 23 are arranged along the first direction X, and each board body 23 is connected to a single cell 10. The first connecting piece 22 is arranged between two adjacent board bodies 23, and both ends of the first connecting piece 22 along the first direction X are respectively connected to the adjacent two board bodies 23. The first connecting piece 22 arches along the second direction Y, that is, arches along the battery thickness direction, so as to bypass the first edge part 12; in the present application, the first connecting piece 22 that arches along the battery thickness direction is provided, and a accommodation space is left for the first edge part 12 through the arching of the first connecting piece 22 to bypass the first edge part 12, without performing destructive operations such as grooving or cutting on the first connecting piece 22, which can effectively ensure the current-carrying performance of the first connecting piece 22.

[0036] Please refer to Figures 1 to 8 , and next, the secondary battery provided by the embodiment of the present application will be introduced in detail.

[0037] In some embodiments, the first direction X, the second direction Y and the third direction Z that intersect are set in the secondary battery provided by the embodiment of the present application to describe the relative position relationship between the components of the secondary battery; specifically, the first direction X, the second direction Y and the third direction Z are orthogonally arranged.

[0038] In some embodiments, refer to Figure 1 , Figure 2 , Figure 6 and Figure 7 . The secondary battery provided by the embodiments of the present application includes a plurality of single cells 10. The width direction of the single cell 10 is the first direction X, and the thickness direction of the single cell 10 is the second direction Y. The plurality of single cells 10 can be arranged side by side along the first direction X, and the plurality of single cells 10 can also be arranged along the second direction Y. The plurality of single cells 10 can be connected in parallel or in series. Series connection increases the voltage while the current capacity remains unchanged, and parallel connection keeps the voltage unchanged but increases the current capacity. The appropriate connection method can be selected according to specific application requirements. The number of single cells 10 is not specifically required, and 2, 3 or other appropriate numbers can be selected according to specific application requirements. In the embodiments of the present application, taking the plurality of single cells 10 arranged side by side along the first direction X as an example, the secondary battery provided by the present application will be described.

[0039] In some embodiments, refer to Figure 7 . The single cell 10 includes a connected body portion 11 and a first edge portion 12. The first edge portion 12 is located between the body portions 11 of two adjacent single cells 10, and the second edge portion 13 extends along the second direction Y to form a convex structure.

[0040] In some embodiments, refer to Figures 1 to 5 . The protection board 20 includes a first connecting member 22 and a plurality of board bodies 23. The plurality of board bodies 23 are arranged along the first direction X, and each board body 23 is electrically connected to a single cell 10; the first connecting member 22 is disposed between two adjacent board bodies 23 and is respectively connected to the two adjacent board bodies 23; the first connecting member 22 arches along the second direction Y to bypass the first edge portion 12. Specifically, when two single cells 10 are provided, the protection board 20 includes two board bodies 23, and each board body 23 is respectively electrically connected to a single cell 10; when three single cells 10 are provided, the protection board 20 includes three board bodies 23. Along the first direction X, the three board bodies 23 are arranged, and first connecting members 22 are provided at both ends of the board body 23 in the middle, and the two first connecting members 22 are respectively connected to the two board bodies 23 at both ends.

[0041] In some embodiments, refer to Figure 1 , Figure 2 , Figure 3 and Figure 5, the first connecting member 22 includes a first flexible circuit board 221. The first flexible circuit board 221 is made of a flexible substrate such as polyimide (PI) or polyester (PET), so it can be bent and folded to adapt to the design requirements of complex shapes and limited spaces. Compared with a rigid printed circuit board (PCB), the first flexible circuit board 221 can make better use of space. When facing the protrusion of the first edge portion 12, the present application provides the first flexible circuit board 221 arched along the second direction Y to leave a receiving space for the first edge portion 12. Crossing the first edge portion 12, there is no need to perform groove cutting like a printed circuit board. Using the first flexible circuit board 221 can effectively protect the current-carrying performance of the circuit.

[0042] In some embodiments, please refer to Figure 7 , in the secondary battery of the embodiment of the present application, the single battery 10 further includes a second edge portion 13 connected to the body portion 11. The second edge portion 13 is located on one side of the body portion 11 in the third direction Z and extends along the first direction X. The second edge portion 13 is connected to the protection plate 20 so that the body portion 11 is connected to the protection plate 20 through the second edge portion 13; the third direction Z is the length direction of the single battery 10. For ease of understanding, the body portion 11 and the second edge portion 13 are arranged along the third direction Z.

[0043] In some embodiments, please refer to Figure 1 and Figure 2 , in a plane perpendicular to the second direction Y, at least a part of the orthographic projection of the protection plate 20 and the second edge portion 13 coincides. It can be understood that since the first connecting member 22 in the present application arches along the second direction Y to cross the first edge portion 12, in the third direction Z, without considering the obstruction of the first edge portion 12, the protection plate 20 and the single battery 10 can be directly arranged side by side, so that the length of the single battery 10 can be increased along the third direction Z under the same volume of the secondary battery, so as to obtain a single battery 10 with a larger volume and improve the capacity of the single battery 10 and the secondary battery.

[0044] In some embodiments, please refer to Figures 1 to 4 , at least one plate body 23 includes a second flexible circuit board 231 and a reinforcement member 232. The second flexible circuit board 231 is connected to the first flexible circuit board 221. Specifically, the second flexible circuit board 231 and the first flexible circuit board 221 can be set as an integrated flexible circuit board. The second flexible circuit board 231 and the first flexible circuit board 221 are two parts of the overall flexible circuit board. The integrated design can reduce the failure rate and ensure its current-carrying performance.

[0045] In some embodiments, please refer to Figures 1 to 4, since the flexible circuit board is made of a flexible substrate such as polyimide (PI) or polyester (PET), it can be bent and folded, and its texture is relatively soft. Therefore, in this application, a reinforcing member 232 is provided to fix the flexible circuit board, so that the flexible circuit board is flat and stable. Specifically, the reinforcing member 232, the second flexible circuit board 231, and the second edge portion 13 are arranged along the second direction Y. In a plane perpendicular to the second direction Y, at least a part of the orthographic projection of the reinforcing member 232 and the second flexible circuit board 231 coincides, so as to press and fix the second flexible circuit board 231 by the cooperation of the reinforcing member 232 and the second edge portion 13; the reinforcing member 232 and the second flexible circuit board 231 can be connected by an adhesive method; wherein, the reinforcing member 232 is a plate-like member, and laying the plate-like member on the surface of the second flexible circuit board 231 can ensure the flatness of the second flexible circuit board 231. Specifically, the reinforcing member 232 can be selected as a plate member made of a hard material such as a steel sheet.

[0046] In some embodiments, please refer to Figures 1 to 4 , at least one plate body 23 includes a first printed circuit board 24. The first printed circuit board 24 and the single cell 10 are arranged along the third direction Z. The first printed circuit board 24 is connected to the second edge portion 13, and in a plane perpendicular to the second direction Y, at least a part of the orthographic projection of the first printed circuit board 24 and the second edge portion 13 coincides, so that in the case of the same volume of the secondary battery, the length of the single cell 10 can be increased along the third direction Z to obtain a single cell 10 with a larger volume, and the capacity of the single cell 10 and the secondary battery can be improved. The first printed circuit board 24 is connected to the first flexible circuit board 221. Specifically, the connection between the first printed circuit board 24 and the first flexible circuit board 221 is realized by welding.

[0047] In some embodiments, please refer to Figures 1 to 4 , the secondary battery provided by the embodiment of this application further includes a second connecting member 30, and the second connecting member 30 is used to realize the snap connection between the secondary battery and the host. Specifically, the second connecting member 30 is connected to the first printed circuit board 24. Along the third direction Z, at least a part of the second connecting member 30 is arranged on the side of the first printed circuit board 24 away from the single cell 10. Further, the second connecting member 30 can be arranged in the middle of the first printed circuit board 24, or can be arranged at both ends of the first printed circuit board 24 along the first direction X to meet the connection requirements of different design working conditions.

[0048] In some embodiments, the second connector 30 includes a third printed circuit board, which is usually made of glass fiber-reinforced epoxy resin, has high mechanical strength and stability, and can maintain shape stability under large loads. At the same time, due to the relatively simple and mature manufacturing process of printed circuit boards, their manufacturing costs are low. And the electrical performance of printed circuit boards is usually stable and reliable, especially widely used in high-frequency and high-speed circuits. Therefore, considering the above factors comprehensively, when facing high working conditions, the need to reduce costs or in high-frequency and high-voltage circuits, the second connector 30 including the third printed circuit board can be selected.

[0049] In some embodiments, referring to Figure 4 , the second connector 30 includes a third flexible circuit board 301, which is made of a flexible substrate such as polyimide (PI) or polyester (PET), so it can be bent and folded to meet the design requirements of complex shapes and limited spaces. At the same time, the flexible circuit board can make better use of space compared to the printed circuit board, especially when the circuit board needs to be installed on a curved surface or in an irregular space, its flexibility is particularly prominent. And the flexible material makes it lighter and thinner than a rigid printed circuit board of the same size. Therefore, for the design of mobile devices and portable devices, the second connector 30 including the third flexible circuit board 301 can be used, such as 3C devices like mobile phones, computers, tablets, etc.

[0050] In some embodiments, referring to Figure 8 , the plate body 23 in the secondary battery provided in the embodiments of the present application further includes an electrical component 25 and a sealing layer 26, and the sealing layer 26 covers the electrical component 25 to provide dust and dirt protection, moisture and water protection, insulation protection, chemical protection, and temperature tolerance protection, etc. for the electrical component. Specifically, the material of the sealing layer 26 can be a three-proof paint, and the sealing layer 26 has a minimum thickness of a mm, satisfying: 0.08 ≤ a ≤ 0.12. It can be understood that currently mass production technologies all use UV (Ultraviolet) glue. To meet the sealing effect, the thickness of the UV glue must reach at least 0.35 mm, but this will cause height restrictions in the area within the top seal of the single cell 10, so that the thinnest MOS (Metal-Oxide-Semiconductor) devices can only be placed in the top seal area, and the higher ICs (Integrated Circuits) are placed outside the top seal area, forcing the protection board 20 to become wider. However, when using the sealing layer 26 made of the three-proof paint material structure in the present application to cover the electrical component, the thickness reaching the value of a can meet the design requirements and can effectively avoid the above defects and reduce the width of the protection board 20.

[0051] In some embodiments, a can be selected from any value of 0.08, 0.085, 0.09, 0.095, 0.1, 0.105, 0.11, 0.115, 0.12 or a value between any two of them.

[0052] In some embodiments, please refer to Figure 5 , at least one plate body 23 includes a second printed circuit board 233. The second printed circuit board 233 and the first printed circuit board 24 are arranged along the first direction X and are connected by a first flexible circuit board 221, realizing the design that two adjacent plate bodies 23 are both printed circuit boards. Specifically, the connection between the second printed circuit board 233 and the first flexible circuit board 221 is realized by welding.

[0053] It can be understood that the secondary battery provided by the embodiments of the present application includes a protection board 20 and a plurality of single cells 10. The plurality of single cells 10 are arranged along the first direction X. The single cell 10 includes a first edge portion 12, and the first edge portion 12 is arranged between two adjacent single cells 10 and extends along the second direction Y, that is, the battery thickness direction; the protection board 20 includes a first connecting member 22 and a plurality of plate bodies 23. The plurality of plate bodies 23 are arranged along the first direction X, and each plate body 23 is connected to a single cell 10. The first connecting member 22 is arranged between two adjacent plate bodies 23, and both ends of the first connecting member 22 along the first direction X are respectively connected to the adjacent two plate bodies 23. The first connecting member 22 arches along the second direction Y, that is, arches along the battery thickness direction, so as to bypass the first edge portion 12; in the present application, the first connecting member 22 that arches along the battery thickness direction is provided. By the arching of the first connecting member 22, a accommodating space is left for the first edge portion 12 to bypass the first edge portion 12, and there is no need to perform destructive operations such as grooving or cutting on the first connecting member 22, which can effectively ensure the current-carrying performance of the first connecting member 22.

[0054] Correspondingly, an embodiment of the present application further provides an electrical device, including the secondary battery provided by the embodiment of the present application.

[0055] In some embodiments, the electrical device may include, but is not limited to, 3C devices such as computers, mobile phones, and tablets.

[0056] The above has introduced in detail a secondary battery and an electrical device provided by the embodiments of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A secondary battery, characterized in that: Having a first direction (X) and a second direction (Y) intersecting each other, the secondary battery comprises: A plurality of single cells (10), wherein the plurality of single cells (10) are arranged along the first direction (X), the second direction (Y) being the thickness direction of the single cells (10), the single cells (10) comprising a main body portion (11) and a first edge portion (12) connected to each other, the first edge portion (12) being located between the main bodies (11) of two adjacent single cells (10), and the first edge portion (12) extending along the second direction (Y); A protective plate (20), the protective plate (20) comprising: A plurality of plates (23), wherein the plurality of plates (23) are arranged along the first direction (X), and each of the plates (23) is electrically connected to one of the single cells (10); A first connecting member (22), the first connecting member (22) is arranged between two adjacent plate bodies (23) and is respectively connected to the two adjacent plate bodies (23); the first connecting member (22) is arched along the second direction (Y) to bypass the first edge portion (12).

2. The secondary battery according to claim 1, characterized in that: The first connecting member (22) comprises a first flexible circuit board (221).

3. The secondary battery according to claim 1, characterized in that: The single battery (10) further comprises a second edge portion (13) connected to the main body portion (11), the second edge portion (13) being located on one side of the main body portion (11) in a third direction (Z) and extending along the first direction (X), the second edge portion (13) being connected to the protective plate (20); the third direction (Z), the second direction (Y) and the first direction (X) intersect; On a plane perpendicular to the second direction (Y), the protective plate (20) and the orthographic projection of the second edge portion (13) at least partially overlap.

4. The secondary battery according to claim 2, characterized in that: At least one of the plates (23) comprises: A second flexible circuit board (231), wherein the second flexible circuit board (231) is connected to the first flexible circuit board (221); A reinforcing member (232), wherein the reinforcing member (232) is connected to the second flexible circuit board (231), and the reinforcing member (232) and the second flexible circuit board (231) are arranged along the second direction (Y).

5. The secondary battery according to claim 2, characterized in that: At least one of the board bodies (23) comprises a first printed circuit board (24).

6. The secondary battery according to claim 5, characterized in that: The invention also comprises a second connecting member (30), wherein the second connecting member (30) is connected to the first printed circuit board (24), and along a third direction (Z), the second connecting member (30) is at least partially arranged on a side of the first printed circuit board (24) away from the single battery (10), and the third direction (Z), the second direction (Y) and the first direction (X) intersect.

7. The secondary battery according to claim 6, characterized in that: The second connecting member (30) comprises a third flexible circuit board (301).

8. The secondary battery according to claim 1, characterized in that: The plate body (23) comprises: Electrical components (25); A sealing layer (26), the sealing layer (26) covers the electrical component (25), the sealing layer (26) has a minimum thickness amm, and satisfies: 0.08≤a≤0.

12.

9. The secondary battery according to claim 5, characterized in that: At least one of the board bodies (23) comprises a second printed circuit board (233), wherein the second printed circuit board (233) and the first printed circuit board (24) are arranged along the first direction (X) and are connected via the first flexible circuit board (221).

10. An electrical device, characterized in that: The invention comprises the secondary battery according to any one of claims 1 to 9.

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