Battery and electric device

Abstract

The utility model provides a battery and a power utilization device, and relates to the technical field of batteries. The battery comprises a plurality of battery cells and a circuit board, the plurality of battery cells are arranged side by side in the width direction of the battery cells, and packaging pins protruding out of the heads of the battery cells are formed between every two adjacent battery cells; the circuit board is arranged at the head of the battery cell, the circuit board comprises at least two printed circuit boards and a flexible assembly connected between the two adjacent printed circuit boards, the flexible assembly comprises a plurality of flexible circuit boards stacked in sequence, and the thickness direction of the printed circuit boards is parallel to the length direction of the battery cell; in the thickness direction of the printed circuit board, at least part of the flexible assembly is higher than the printed circuit board, the flexible assembly and the head of the battery cell define the containing area, the packaging pin is located in the containing area, the structural strength is high, and then the stability of electric connection can be guaranteed.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery and an electrical device. Background Art

[0002] The current demand for battery capacity is increasing. The existing battery solutions require a large stacking space in the length direction. In order to reduce the length direction of the battery, the process of folding the top seal protection plate of the battery cell and placing it vertically with the battery cell and injection molding has gradually become the main solution for customers to increase battery capacity. However, in dual-cell projects, since the side seals of the battery cell cannot be bent, there are packaging feet in the middle of the battery. When installing the protection plate, the protection plate will interfere with the packaging feet and affect the overall length of the battery.

[0003] The existing protection board uses a single flexible circuit board to connect two printed circuit boards so that the flexible circuit board avoids the packaging pins. However, due to the low structural strength of the single flexible circuit board, the flexible circuit board itself is prone to deformation, which may reduce the electrical connection stability of the protection board. Utility Model Content

[0004] The purpose of the present application also includes providing a battery whose circuit board has a high structural strength, thereby ensuring the stability of the electrical connection.

[0005] The purpose of the present application also includes providing an electrical device whose circuit board has a high structural strength, thereby ensuring the stability of the electrical connection.

[0006] This application can be implemented as follows:

[0007] In a first aspect, the present application provides a battery, comprising a plurality of battery cells and a circuit board, wherein the plurality of battery cells are arranged side by side along the width direction of the battery cells, and packaging feet protruding from the heads of the battery cells are formed between two adjacent battery cells; the circuit board is arranged at the heads of the battery cells, the circuit board comprises at least two printed circuit boards and a flexible component connected between two adjacent printed circuit boards, the flexible component comprises a plurality of flexible circuit boards stacked in sequence, and the thickness direction of the printed circuit board is parallel to the length direction of the battery cells;

[0008] In the thickness direction of the printed circuit board, at least a portion of the flexible component is higher than the printed circuit board, the flexible component and the head of the battery cell enclose a receiving area, and the packaging pin is located in the receiving area.

[0009] Optionally, the flexible circuit boards each include a first connecting portion and two second connecting portions connected to both ends of the first connecting portion, the two second connecting portions are electrically connected to two adjacent printed circuit boards, respectively, and in the thickness direction of the printed circuit board, the first connecting portion is higher than the second connecting portion, the first connecting portion is higher than the packaging pin, and the first connecting portions in each of the flexible circuit boards are stacked in sequence.

[0010] Optionally, each of the flexible circuit boards includes two third connecting parts, wherein one of the third connecting parts is connected between the first connecting part and one of the second connecting parts, and the other of the third connecting parts is connected between the first connecting part and another of the second connecting parts.

[0011] Optionally, in the length direction of the printed circuit board, the length of the first connecting portion is smaller than the distance between two second connecting portions.

[0012] Optionally, the second connecting portion is connected to any one side of the printed circuit board in the thickness direction.

[0013] Optionally, components are arranged on the printed circuit board, and in the thickness direction of the printed circuit board, the first connecting portion of the lowest flexible circuit board is not higher than the components.

[0014] The present application also provides another battery, comprising a plurality of battery cells and a circuit board, wherein the plurality of battery cells are arranged side by side along the width direction of the battery cells, and packaging pins protruding from the heads of the battery cells are formed between two adjacent battery cells; the circuit board is arranged at the heads of the battery cells, and the circuit board comprises at least two first printed circuit boards and a second printed circuit board connected between two adjacent first printed circuit boards, and the thickness direction of the first printed circuit board is parallel to the length direction of the battery cells;

[0015] The circuit board includes a fourth connecting portion. In the thickness direction of the first printed circuit board, the first printed circuit board, the fourth connecting portion and the second printed circuit board are stacked in sequence. The second printed circuit board is higher than the first printed circuit board. A receiving area is formed between the second printed circuit board and the head of the battery cell, and the packaging foot is located in the receiving area.

[0016] Optionally, the first printed circuit board is welded to the second printed circuit board via the fourth connecting portion.

[0017] In a second aspect, the present application also provides an electrical device, comprising the battery.

[0018] The beneficial effects of the battery and electrical device of the present application include, for example: in order to improve the structural strength of the circuit board, a first battery is designed, which includes multiple battery cells and a circuit board, the circuit board includes at least two printed circuit boards and a flexible component connected between two adjacent printed circuit boards, the flexible component includes multiple flexible circuit boards stacked in sequence, the flexible component and the head of the battery cell are surrounded to form a receiving area for accommodating the packaging pin, the receiving area can accommodate the packaging pin, and multiple flexible circuit boards are stacked in sequence, which enhances the structural strength of the circuit board, and the stacked flexible circuit boards are not easily deformed, thereby ensuring the stability of the electrical connection.

[0019] In addition, a second battery is designed, including multiple battery cells and circuit boards. The circuit boards include at least two first printed circuit boards and a second printed circuit board connected between two adjacent first printed circuit boards. The circuit boards also include a fourth connecting portion. The first printed circuit board, the fourth connecting portion and the second printed circuit board are stacked in sequence. A receiving area is formed between the second printed circuit board and the head of the battery cell. The receiving area can accommodate the packaging pins. Since the structural strength of the second printed circuit board is higher than that of the flexible circuit board, the second printed circuit board is not easily deformed, thereby ensuring the stability of the electrical connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of a circuit board in Embodiment 1 of the present application;

[0022] Figure 2 This is an exploded diagram of the battery in Example 1 of the present application;

[0023] Figure 3 This is a schematic diagram of the partial structure of the packaging bag in Example 1 of the present application;

[0024] Figure 4 A partial cross-sectional view of a battery in Example 1 of the present application;

[0025] Figure 5 This is a schematic diagram of the partial structure of the battery in Example 2 of the present application.

[0026] Icons: 100-circuit board; 110-printed circuit board; 111-components; 112-nickel sheet; 120-flexible circuit board; 121-first connection part; 122-second connection part; 123-third connection part; 130-output circuit board; 140-first printed circuit board; 150-second printed circuit board; 151-fourth connection part; 200-battery cell; 210-fixing sheet; 220-ear; 300-injection molding structure; 400-insulating tape; 500-packaging bag; 510-top sealing part; 511-top edge sealing; 520-side sealing part; 521-side edge sealing. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present application, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, it is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0032] It should be noted that, in the absence of conflict, the features in the embodiments of the present application may be combined with each other.

[0033] Embodiment 1

[0034] Please refer to Figure 1-Figure 4An embodiment of the present application provides a battery, comprising a circuit board 100 and a plurality of battery cells 200, wherein the plurality of battery cells 200 are arranged side by side along the width direction of the battery cells 200, and packaging feet protruding from the heads of the battery cells 200 are formed between two adjacent battery cells 200; the circuit board 100 is arranged at the heads of the battery cells 200, and the circuit board 100 comprises at least two printed circuit boards 110 and a flexible component connected between two adjacent printed circuit boards 110, wherein the flexible component comprises a plurality of flexible circuit boards 120 stacked in sequence, and the thickness direction of the printed circuit board 110 is parallel to the length direction of the battery cells 200; in the thickness direction of the printed circuit board 110, at least part of the flexible component is higher than the printed circuit board 110, and the flexible component and the heads of the battery cells 200 enclose a receiving area, and the packaging feet are located in the receiving area.

[0035] It should be noted that at least part of the flexible component is higher than the printed circuit board 110, which means that the position of part or all of the structure of the flexible component in the thickness direction is higher than the position of the printed circuit board 110. At this time, the flexible circuit board 120 can cross the packaging pins between two adjacent battery cells 200 through the increased height, thereby forming a avoidance with the packaging pins and electrically connecting the printed circuit board 110 between the two adjacent battery cells 200.

[0036] It should be noted that the battery includes a plurality of cells 200, each of which is packaged by a packaging bag 500, and a single packaging bag 500 includes at least a top sealing portion 510 and two side sealing portions 520. In one embodiment, the top sealing portion 510 is bent toward the head of the cell 200, so as to be parallel to and extend from the plane where the head of the cell 200 is located. At this time, the top sealing portion 510 is parallel to the printed circuit board 110, and the two ends of the top sealing portion 510 are connected to the side sealing portions 520. When the top sealing portion 510 is bent, it will form a packaging foot with the connected side sealing portions 520. In another embodiment, one end of the side sealing portion 520 extending toward the head of the cell 200 has a side sealing edge 521, and the top sealing portion 510 is not bent. At this time, the top sealing portion 510 is perpendicular to the plane where the head of the cell 200 is located, that is, the top sealing portion 510 is perpendicular to the printed circuit board 110. At this time, the side sealing edge 521 forms a packaging foot alone. The packaging pin is formed between two adjacent battery cells 200, and the circuit board 100 is placed horizontally on the head of the battery cell 200, and the circuit board 100 needs to avoid it, so there is a gap between at least two adjacent printed circuit boards 110, and the gap corresponds to the packaging pin, that is, the packaging pin is located in the gap, and the flexible component is also located in the gap, connecting the two adjacent printed circuit boards 110, and avoiding the packaging pin.

[0037] Each flexible circuit board 120 includes a first connection portion 121 and two second connection portions 122 connected to both ends of the first connection portion 121. The two second connection portions 122 are electrically connected to two adjacent printed circuit boards 110 respectively. In the thickness direction of the printed circuit board 110, the first connection portion 121 is higher than the second connection portion 122. The first connection portion 121 is higher than the packaging foot, that is, the first connection portion 121 crosses over the packaging foot, and the first connection portions 121 in each flexible circuit board 120 are stacked in sequence.

[0038] It should be noted that the length directions of all printed circuit boards 110 are consistent, and at least two adjacent printed circuit boards 110 are arranged at intervals, and all flexible circuit boards 120 are arranged between two printed circuit boards 110. The two second connecting parts 122 are connected to the two ends of the first connecting part 121 along the length direction of the printed circuit board 110. In the thickness direction of the printed circuit board 110, the first connecting part 121 is higher than the second connecting part 122, and the first connecting part 121 is higher than the packaging pin. A receiving area capable of receiving the packaging pin is formed between the first connecting part 121 and the head of the battery cell 200.

[0039] The first connecting portions 121 in each flexible circuit board 120 are stacked in sequence. On the one hand, the structural strength of the flexible circuit board 120 is strengthened, and the stacked flexible circuit boards 120 are not easily deformed, thereby ensuring the stability of the electrical connection. On the other hand, the first connecting portions 121 in each flexible circuit board 120 are stacked in sequence, so that the cross-sectional area of ​​the stacked flexible circuit boards 120 is increased, the flow capacity is improved, and the supporting strength of the flexible circuit boards 120 is guaranteed by stacking in sequence.

[0040] The second connection portion 122 is connected to any side of the printed circuit board 110 in the thickness direction. When the second connection portion 122 is connected to any side of the printed circuit board 110, the contact area between the second connection portion 122 and the printed circuit board 110 is larger, thereby ensuring the stability of the electrical connection.

[0041] Exemplarily, when the number of flexible circuit boards 120 is two, the two second connection portions 122 of one flexible circuit board 120 are respectively connected to the top surfaces of the two printed circuit boards 110, and the two second connection portions 122 of the other flexible circuit board 120 are respectively connected to the bottom surfaces of the two printed circuit boards 110, and the first connection portions 121 of the two flexible circuit boards 120 are overlapped together, which strengthens the structural strength while also improving the flow capacity.

[0042] It is understandable that the number of the flexible circuit boards 120 may be more than three, as long as the first connection parts 121 in each flexible circuit board 120 are stacked in sequence.

[0043] In this embodiment, each flexible circuit board 120 includes two third connection parts 123, one of the third connection parts 123 is connected between the first connection part 121 and one of the second connection parts 122, and the other third connection part 123 is connected between the first connection part 121 and the other second connection part 122.

[0044] It should be pointed out that the first connection part 121 and the second connection part 122 are parallel, and the two third connection parts 123 are symmetrically arranged on both sides of the first connection part 121 along the length direction of the printed circuit board 110. The third connection part 123 is inclined relative to the first connection part 121, one end of the third connection part 123 is connected to the first connection part 121, and the other end of the third connection part 123 is connected to the second connection part 122. A receiving area capable of accommodating the packaging pin is formed between the first connection part 121, the two third connection parts 123, and the head of the battery cell 200.

[0045] In the length direction of the printed circuit board 110 , the length of the first connection portion 121 is smaller than the distance between the two second connection portions 122 .

[0046] One end of the third connection part 123 away from the first connection part 121 extends toward the outside of the first connection part 121, and the third connection part 123 is inclined relative to the first connection part 121, so that the avoidance area formed between the first connection part 121 and the two third connection parts 123 is larger, thereby better avoiding interference with the packaging foot in the middle of the battery.

[0047] In this embodiment, components 111 are arranged on the printed circuit board 110, and in the thickness direction of the printed circuit board 110, the first connection portion 121 of the bottom flexible circuit board 120 is not higher than the component 111. The first connection portion 121 of the bottom flexible circuit board 120 may be higher or lower than the component 111 according to actual needs, which is not limited in this application.

[0048] It should be noted that a plurality of components 111 are arranged on the printed circuit board 110. In the thickness direction of the printed circuit board 110, the height of the first connecting portion 121 of the lowest flexible circuit board 120 is less than or equal to the height of the highest component 111 among the plurality of components 111, which can make the overall thickness of the circuit board 100 lower to a certain extent. When the circuit board 100 is arranged in a battery, the space occupancy rate of the circuit board 100 inside the battery is lower.

[0049] In addition, the circuit board 100 further includes an output circuit board 130 , which is connected to one of the printed circuit boards 110 and is used for connecting to an external electrical device.

[0050] In this embodiment, the battery further includes an injection-molded structure 300 , and the injection-molded structure 300 simultaneously covers the printed circuit board 110 , the flexible circuit board 120 , and the components 111 .

[0051] The injection molded structural member 300 can be made of injection molding rubber. The injection molded structural member 300 simultaneously covers the printed circuit board 110, the flexible circuit board 120 and the components 111. On the one hand, it can enhance the structural strength of the circuit board 100 and prevent the circuit board 100 from rebounding and deforming. On the other hand, it can also protect the printed circuit board 110, the flexible circuit board 120 and the components 111 on the circuit board 100, thereby effectively preventing the battery from falling and failing.

[0052] In addition, the printed circuit board 110 is connected to a nickel sheet 112 on the surface facing the battery cell 200, and the tab 220 of the battery cell 200 extends along the top seal 510 and passes through the top seal edge 511 to be electrically connected to the nickel sheet 112. The outside of the battery cell 200, the top of the battery cell 200, and the outside of the injection molded structural member 300 are all covered with insulating tape 400, and the insulating tape 400 on the top of the battery cell 200 is bonded to the nickel sheet 112 by double-sided tape. A fixed sheet 210 made of PET material is also provided between the two battery cells 200, and the fixed sheet 210 connects the two battery cells 200 at the same time.

[0053] This embodiment also provides an electric device, including the above-mentioned battery. For example, the electric device can be a vehicle, a ship, a spacecraft, etc. The vehicle can be a fuel vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The embodiment of this application does not impose any special restrictions on the above-mentioned electric device.

[0054] Embodiment 2

[0055] Please refer to Figure 5 This embodiment also provides a battery and an electrical device, which are different from the first embodiment in that:

[0056] The circuit board 100 includes at least two first printed circuit boards 140 and a second printed circuit board 150 connected between two adjacent first printed circuit boards 140, and the thickness direction of the first printed circuit board 140 is parallel to the length direction of the battery cell 200; the circuit board 100 includes a fourth connecting portion 151, and in the thickness direction of the first printed circuit board 140, the first printed circuit board 140, the fourth connecting portion 151 and the second printed circuit board 150 are stacked in sequence, the second printed circuit board 150 is higher than the first printed circuit board 140, and a receiving area is formed between the second printed circuit board 150 and the head of the battery cell 200, and the packaging foot is located in the receiving area.

[0057] In the length direction of the second printed circuit board 150 , fourth connection portions 151 are disposed near both ends of the second printed circuit board 150 , and the two fourth connection portions 151 are electrically connected to two adjacent first printed circuit boards 140 , respectively.

[0058] It should be noted that the first printed circuit board 140 and the second printed circuit board 150 are parallel, the length directions of the first printed circuit board 140 and the second printed circuit board 150 are consistent, the fourth connection portion 151 is arranged on the board surface of the second printed circuit board 150 facing the first printed circuit board 140, and the two fourth connection portions 151 are respectively close to the two ends of the length direction of the second printed circuit board 150. At this time, the second printed circuit board 150 is stacked above the fourth connection portion 151, so that it can be ensured that the height of the second printed circuit board 150 is higher than that of the first printed circuit board 140 in the thickness direction, and the second printed circuit board 150 can cross over the packaging pin to form a avoidance.

[0059] Fourth connecting portions 151 are provided near both ends of the second printed circuit board 150. When the two fourth connecting portions 151 are electrically connected to two adjacent first printed circuit boards 140 respectively, the second printed circuit board 150 is higher than the first printed circuit board 140. A receiving area capable of receiving the package pins is formed between the heads of the battery cells 200 of the second printed circuit board 150, thereby reducing the height of the first printed circuit board 140 and making the overall thickness of the circuit board 100 relatively small. In addition, since the structural strength of the second printed circuit board 150 is higher than that of the flexible circuit board 120, the second printed circuit board 150 is not easily deformed, thereby ensuring the stability of the electrical connection.

[0060] In this embodiment, the first printed circuit board 140 is welded to the second printed circuit board 150 via the fourth connecting portion 151 .

[0061] The fourth connection portion 151 is formed between the first PCB 140 and the second PCB 150 by stacking solder joints, so that the second PCB 150 is higher than the first PCB 140 and the second PCB 150 straddles the package pins and is not likely to interfere with the package pins.

[0062] In this embodiment, the injection molded structural member 300 simultaneously covers the first printed circuit board 140, the second printed circuit board 150 and the components 111. On the one hand, it can enhance the structural strength of the circuit board 100 and prevent the circuit board 100 from rebounding and deforming. On the other hand, it can also protect the first printed circuit board 140, the second printed circuit board 150 and the components 111 on the circuit board 100, thereby effectively preventing the battery from falling and failing.

[0063] The beneficial effects of the battery and the electrical device provided by the embodiments of the present application include at least: by forming a receiving area capable of receiving the package pins between the first connecting portion 121, the two third connecting portions 123 and the head of the battery cell 200, or by forming a receiving area capable of receiving the package pins between the second printed circuit board 150 and the head of the battery cell 200, the overall thickness of the circuit board 100 is relatively small, and the space occupied by the circuit board 100 in its own thickness direction is reduced by about 1.2 mm, thereby reserving a design space for increasing the capacity of the battery cell 200; the first connecting portions 121 in each flexible circuit board 120 are stacked in sequence, thereby enhancing the structural strength of the flexible circuit board 120. The stacked flexible circuit board 120 is not easily deformed, thereby ensuring the stability of the electrical connection and improving the flow capacity, or the second printed circuit board 150 has a higher structural strength than the flexible circuit board 120, so that the second printed circuit board 150 is not easily deformed, thereby ensuring the stability of the electrical connection; the injection molding structure 300 simultaneously covers the printed circuit board 110, the flexible circuit board 120 and the components 111, or simultaneously covers the first printed circuit board 140, the second printed circuit board 150 and the components 111, while strengthening the structural strength of the circuit board 100, it can also protect the electrical structure on the circuit board 100.

[0064] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A battery, characterized in that: The invention comprises a circuit board (100) and a plurality of battery cells (200), wherein the plurality of battery cells (200) are arranged side by side along the width direction of the battery cells (200), and packaging feet protruding from the heads of the battery cells (200) are formed between two adjacent battery cells (200); the circuit board (100) is arranged at the heads of the battery cells (200), the circuit board (100) comprises at least two printed circuit boards (110) and a flexible component connected between two adjacent printed circuit boards (110), the flexible component comprises a plurality of flexible circuit boards (120) stacked in sequence, and the thickness direction of the printed circuit board (110) is parallel to the length direction of the battery cells (200); In the thickness direction of the printed circuit board (110), at least part of the flexible component is higher than the printed circuit board (110), the flexible component and the head of the battery cell (200) are enclosed to form a receiving area, and the packaging pin is located in the receiving area.

2. The battery according to claim 1, characterized in that The flexible circuit boards (120) each comprise a first connection portion (121) and two second connection portions (122) connected to both ends of the first connection portion (121); the two second connection portions (122) are electrically connected to two adjacent printed circuit boards (110) respectively; in the thickness direction of the printed circuit board (110), the first connection portion (121) is higher than the second connection portion (122); the first connection portion (121) is higher than the packaging foot; and the first connection portions (121) in each of the flexible circuit boards (120) are stacked in sequence.

3. The battery according to claim 2, characterized in that Each of the flexible circuit boards (120) comprises two third connecting parts (123), wherein one of the third connecting parts (123) is connected between the first connecting part (121) and one of the second connecting parts (122), and the other of the third connecting parts (123) is connected between the first connecting part (121) and the other of the second connecting parts (122).

4. The battery according to claim 2, characterized in that In the length direction of the printed circuit board (110), the length of the first connecting portion (121) is smaller than the distance between the two second connecting portions (122).

5. The battery according to claim 2, characterized in that The second connecting portion (122) is connected to any one side of the printed circuit board (110) in the thickness direction.

6. The battery according to any one of claims 2 to 5, characterized in that: The printed circuit board (110) is provided with a component (111), and in the thickness direction of the printed circuit board (110), the first connection portion (121) of the lowest flexible circuit board (120) is not higher than the component (111).

7. The battery according to claim 1, characterized in that The battery further comprises an injection-molded structural component (300), wherein the injection-molded structural component (300) covers the circuit board (100).

8. A battery, characterized in that: The invention comprises a plurality of battery cells (200) and a circuit board (100), wherein the plurality of battery cells (200) are arranged side by side along the width direction of the battery cells (200), and packaging feet protruding from the heads of the battery cells (200) are formed between two adjacent battery cells (200); the circuit board (100) is arranged at the heads of the battery cells (200), and the circuit board (100) comprises at least two first printed circuit boards (140) and a second printed circuit board (150) connected between two adjacent first printed circuit boards (140), and the thickness direction of the first printed circuit board (140) is parallel to the length direction of the battery cells (200); The circuit board (100) comprises a fourth connecting portion (151); in the thickness direction of the first printed circuit board (140), the first printed circuit board (140), the fourth connecting portion (151) and the second printed circuit board (150) are stacked in sequence; the second printed circuit board (150) is higher than the first printed circuit board (140); a receiving area is formed between the second printed circuit board (150) and the head of the battery cell (200); and the packaging foot is located in the receiving area.

9. The battery according to claim 8, characterized in that The first printed circuit board (140) is welded to the second printed circuit board (150) via the fourth connecting portion (151).

10. An electrical device, characterized in that: A battery comprising any one of claims 1 to 9.

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