A battery

Abstract

The application relates to the technical field of batteries, and discloses a battery which comprises a battery cell and a flexible circuit board. Specifically, the battery cell comprises an electrode assembly and a packaging piece, the electrode assembly is provided with a top sealing area at one end in a first direction, the electrode assembly is connected with a tab assembly, and at least part of the tab assembly is arranged in the top sealing area; the flexible circuit board is provided with an input part and an output part which are electrically connected, the input part is connected with the tab assembly, the input part is arranged in the top sealing area, and the output part can be arranged in a foldable mode and is wrapped with the packaging piece. The battery disclosed by the application can solve or improve the problem of low energy density of the battery.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically to a battery. Background Technology

[0002] With the rapid development of consumer electronics and electric vehicles, increasingly higher requirements are being placed on the energy density, safety, reliability, and manufacturing cost of lithium-ion batteries.

[0003] In the existing manufacturing technology of soft-pack batteries, the tabs (positive tab and negative tab) of the cell extend from the aluminum-plastic film encapsulation body of the cell body. They are then welded to the protection board (PCB) outside the cell through additional metal connecting pieces (such as nickel sheets), and then externally wrapped and fixed using insulating tape.

[0004] However, the external tabs and welding points occupy the head space of the cell, significantly increasing the overall size of the battery, especially the head thickness. This space reduces the space occupied by the active material in the cell, resulting in a large battery volume and low energy density. Summary of the Invention

[0005] This invention provides a battery to solve or improve the problems of large battery size and low energy density.

[0006] This invention provides a battery comprising: A battery cell includes an electrode assembly and a package, wherein a top sealing region is provided at one end of the electrode assembly along a first direction, and the electrode assembly is connected to a tab assembly, at least a portion of the tab assembly being disposed in the top sealing region; A flexible circuit board has an input section and an output section that are electrically connected. The input section is connected to the tab assembly and is disposed in the top sealing area. The output section is bendable and is wrapped with the package.

[0007] In this embodiment, the input section of the flexible circuit board is connected to the tab assembly. The electrode assembly transmits electrical energy to the output section through the tab assembly and the input section, and the output section outputs electrical energy. The input section is encapsulated in the top sealing area, eliminating the need for the tab assembly to be led out in the traditional battery structure and soldered to the external circuit board via a separate metal connector, thus compressing the size of the top sealing area. The output section is bendable, which reduces its size in the first direction. The space saved allows for a larger electrode assembly, enabling the electrode assembly to accommodate more active material, thereby significantly improving the energy density of the battery cell.

[0008] In one alternative embodiment, the output section is adapted to output electrical energy, and the output section is bendable toward the electrode assembly to reduce the space occupied by the output section in the first direction.

[0009] In one optional embodiment, the output section is provided with a positive contact and a negative contact, the flexible circuit board is provided with a positive trace and a negative trace, the tab assembly includes a positive tab and a negative tab, one end of the positive trace is connected to the positive tab and the other end is connected to the positive contact, one end of the negative trace is connected to the negative tab and the other end is connected to the negative contact.

[0010] In one optional embodiment, a first protection element and a second protection element are further included. Both the first protection element and the second protection element are disposed on the output section. The positive terminal line is connected to the positive terminal contact through the first protection element, and the negative terminal line is connected to the negative terminal contact through the second protection element.

[0011] In one optional embodiment, the positive electrode trace includes a first connecting segment and a second connecting segment. The first connecting segment is connected to the positive electrode contact and extends along a first direction. The second connecting segment is connected to the positive electrode tab and extends along a second direction. The first direction and the second direction are set at an angle that is neither 0 degrees nor 180 degrees.

[0012] In one optional embodiment, the negative electrode trace includes a third connecting segment and a fourth connecting segment. The third connecting segment is connected to the negative electrode contact and extends along the first direction. The fourth connecting segment is connected to the negative electrode tab and extends along the second direction. The first direction and the second direction are set at an angle that is neither 0° nor 180°.

[0013] In one alternative embodiment, the output portion is located between the positive electrode and the negative electrode along the second direction.

[0014] In one alternative embodiment, the spacing H between the first connecting segment and the third connecting segment is greater than 0.5 mm along the second direction.

[0015] In one optional embodiment, the flexible circuit board is provided with a positive electrode pad, the positive electrode pad is connected to the second connecting segment, and the positive electrode pad is fixed to the positive electrode tab by laser welding.

[0016] In one optional embodiment, the flexible circuit board is provided with a negative electrode pad, the negative electrode pad is connected to the fourth connecting segment, and the negative electrode pad and the negative electrode tab are fixed by laser welding. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a battery according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a battery structure with the battery casing removed according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a battery structure with the battery casing and cell removed according to an embodiment of the present invention; Figure 4 This is a side view of a battery according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a flexible circuit board in a battery after bending, according to an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures: 1. Battery cell; 101. Top sealing area; 102. Tab assembly; 1021. Positive tab; 1022. Negative tab; 103. Electrode assembly; 1031. Positive electrode sheet; 1032. Negative electrode sheet; 2. Output terminal; 3. Flexible circuit board; 301. Input section; 302. Output section; 303. Positive electrode trace; 3031. First connecting section; 3032. Second connecting section; 304. Negative electrode trace; 3041. Third connecting section; 3042. Fourth connecting section; 305. Positive electrode pad; 306. Negative electrode pad; 4. Package; 5. First protection element; 6. Second protection element; 7. Battery casing; Z, First direction; X, Second direction; Y, Third direction. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] With the rapid development of consumer electronics and electric vehicles, increasingly higher requirements are being placed on the energy density, safety, reliability, and manufacturing cost of lithium-ion batteries.

[0022] In the existing manufacturing technology of soft-pack batteries, the tabs (positive tab and negative tab) of the cell extend from the aluminum-plastic film encapsulation body of the cell body. They are then welded to the protection board (PCB) outside the cell through additional metal connecting pieces (such as nickel sheets), and then externally wrapped and fixed using insulating tape.

[0023] However, the external tabs and solder joints occupy the head space of the cell, significantly increasing the overall size of the battery, especially the head thickness. This reduced space leads to a decrease in the space occupied by the active material within the cell, resulting in a large battery size and low energy density. Therefore, this application provides a battery to solve or improve the problems of large battery size and low energy density.

[0024] The following is combined Figures 1 to 5 The following describes embodiments of the present invention.

[0025] According to an embodiment of the present invention, a battery is provided, such as Figure 1 and Figure 3 As shown, the device includes a battery cell 1 and a flexible circuit board 3. Specifically, the battery cell 1 includes an electrode assembly 103 and a package 4. One end of the electrode assembly 103 along the first direction Z is provided with a top sealing region 101. The electrode assembly 103 is connected to a tab assembly 102, and at least a portion of the tab assembly 102 is disposed in the top sealing region 101. The flexible circuit board 3 has an input section 301 and an output section 302 that are electrically connected. The input section 301 is connected to the tab assembly 102 and is disposed in the top sealing region 101. The output section 302 is bendable and is wrapped with the package 4.

[0026] In this implementation, such as Figure 1 and Figure 3 As shown, the input section 301 of the flexible circuit board 3 is connected to the tab assembly 102. The electrode assembly 103 transmits electrical energy to the output section 302 through the tab assembly 102 and the input section 301, and the output section 302 outputs electrical energy. The input section 301 is encapsulated in the top sealing area 101, eliminating the need for the tab assembly 102 to be led out in the traditional battery structure and soldered to the external circuit board via an independent metal connecting piece, thus compressing the size of the top sealing area 101. The output section 302 is bendable, which can reduce the size of the output section 302 in the first direction Z. The space saved can be increased to enlarge the size of the electrode assembly 103, allowing the electrode assembly 103 to accommodate more active materials, thereby significantly improving the energy density of the cell 1.

[0027] Specifically, such as Figure 1 As shown, the battery cell 1 includes a positive electrode 1031 and a negative electrode 1032, and is disposed inside the battery casing 7. The battery casing 7 has an opening, which corresponds to the top sealing area 101.

[0028] In one embodiment, such as Figure 4 and Figure 5 As shown, the output section 302 is adapted to output electrical energy, and the output section 302 can be bent toward the electrode assembly 103 to reduce the space occupied by the output section 302 in the first direction Z.

[0029] In this embodiment, such as Figure 5 As shown, the output part 302 is bent and closely attached to the battery cell 1, which can change the output part 302 of the flexible circuit board 3 from extending along the first direction Z to being attached to one end of the battery cell 1, saving the space occupied by the battery cell 1 in the first direction Z. The space saved can increase the volume occupied by the active material in the battery cell 1, thereby increasing the energy density of the battery cell 1.

[0030] In one embodiment, such as Figure 2 and Figure 3 As shown, the output section 302 is provided with a positive contact and a negative contact, the flexible circuit board 3 is provided with a positive trace 303 and a negative trace 304, and the tab assembly 102 includes a positive tab 1021 and a negative tab 1022. One end of the positive trace 303 is connected to the positive tab 1021 and the other end is connected to the positive contact. One end of the negative trace 304 is connected to the negative tab 1022 and the other end is connected to the negative contact.

[0031] In this embodiment, such as Figure 2 and Figure 3 As shown, the flexible circuit board 3 has a positive electrode trace 303 and a negative electrode trace 304, which shortens the positive electrode tab 1021 and the negative electrode tab 1022, reduces the space occupied by the positive electrode tab 1021 and the negative electrode tab 1022 in the top sealing area 101, and reduces the size of the battery cell 1 along the first direction Z. This design integrates the dispersed external wires in the traditional battery cell 1 into the internal lamination structure of the flexible circuit board 3, making the electrical connection lines more organized and eliminating the risk of wear or short circuit caused by external wiring harnesses.

[0032] Specifically, the positive and negative contacts are used for electrical connection with electronic devices.

[0033] In one embodiment, such as Figure 2 and Figure 3 As shown, it also includes a first protection element 5 and a second protection element 6. Both the first protection element 5 and the second protection element 6 are disposed on the output section 302. The positive terminal line 303 is connected to the positive terminal contact through the first protection element 5, and the negative terminal line 304 is connected to the negative terminal contact through the second protection element 6.

[0034] In this embodiment, the battery structure is further simplified. While ensuring the safe operation of the battery, the complexity of the top sealing area 101 is continuously reduced and the space is minimized, which is beneficial to increasing the volume of the battery cell 1.

[0035] Specifically, both the first protection element 5 and the second protection element 6 include protective devices such as fuses, thermistors, and transistor switches.

[0036] In one embodiment, such as Figure 2 and Figure 3 As shown, the positive electrode trace 303 includes a first connecting segment 3031 and a second connecting segment 3032. The first connecting segment 3031 is connected to the positive electrode contact and extends along the first direction Z. The second connecting segment 3032 is connected to the positive electrode tab 1021 and extends along the second direction X. The first direction Z and the second direction X are set at an angle that is neither 0 degrees nor 180 degrees.

[0037] In this embodiment, such as Figure 2 and Figure 3 As shown, the first connecting segment 3031 and the second connecting segment 3032 are angled, which is equivalent to changing the bending angle of the positive electrode tab 1021. Compared with directly changing the bending angle of the positive electrode tab 1021, setting the angle of the first connecting segment 3031 and the second connecting segment 3032 on the flexible circuit board 3 is simpler. Furthermore, the angle between the first connecting segment 3031 and the second connecting segment 3032 can be adjusted between 0 degrees and 180 degrees, making it easy to adapt to batteries of different sizes. Specifically, the angle between the first connecting segment 3031 and the second connecting segment 3032 is 90 degrees.

[0038] In one embodiment, such as Figure 2 and Figure 3 As shown, the negative electrode trace 304 includes a third connecting segment 3041 and a fourth connecting segment 3042. The third connecting segment 3041 is connected to the negative electrode contact and extends along the first direction Z. The fourth connecting segment 3042 is connected to the negative electrode tab 1022 and extends along the second direction X. The first direction Z and the second direction X are set at an angle that is neither 0° nor 180°.

[0039] In this embodiment, such as Figure 2 and Figure 3 As shown, the third connecting segment 3041 and the fourth connecting segment 3042 are angled, which is equivalent to changing the bending angle of the negative electrode tab 1022. Compared with directly changing the bending angle of the negative electrode tab 1022, setting the angle of the third connecting segment 3041 and the fourth connecting segment 3042 on the flexible circuit board 3 is simpler. Furthermore, the angle between the third connecting segment 3041 and the fourth connecting segment 3042 can be adjusted between 0 degrees and 180 degrees, making it easy to adapt to batteries of different sizes. Specifically, the angle between the third connecting segment 3041 and the fourth connecting segment 3042 is 90 degrees.

[0040] In some embodiments, the output section 302 is provided with an output terminal 2, which includes a positive contact and a negative contact, and the positive contact and the negative contact are adapted to connect to electrical equipment.

[0041] In one embodiment, such as Figure 2 and Figure 3 As shown, the positive electrode trace 303 includes a first connecting segment 3031 and a second connecting segment 3032. The first connecting segment 3031 is connected to the positive electrode contact and extends along the first direction Z. The second connecting segment 3032 is connected to the positive electrode tab 1021 and extends along the second direction X. The negative electrode trace 304 includes a third connecting segment 3041 and a fourth connecting segment 3042. The third connecting segment 3041 is connected to the negative electrode contact and extends along the first direction Z. The fourth connecting segment 3042 is connected to the negative electrode tab 1022 and extends along the second direction X. The first direction Z and the second direction X are set at an angle that is neither 0° nor 180°.

[0042] In this embodiment, such as Figure 2 and Figure 3 As shown, the second connecting segment 3032 and the fourth connecting segment 3042 extend along the second direction X and are close to each other. The second connecting segment 3032 can be connected to the positive electrode 1021, shortening the length of the positive electrode 1021 extending along the second direction X and reducing costs. The fourth connecting segment 3042 can be connected to the negative electrode 1022, shortening the length of the negative electrode 1022 extending along the second direction X and reducing costs. The second connecting segment 3032 and the fourth connecting segment 3042 solve the problem of misalignment when the positive electrode 1021 and the negative electrode 1022 extend in the second direction X. The second connecting segment 3032 and the fourth connecting segment 3042 provide a flexible and efficient wiring solution. The first connecting segment 3031 and the third connecting segment 3041 extend along the first direction Z, and their extension directions are consistent, ensuring the stability of the connection with the output terminals 2 (positive and negative contacts). The first connecting segment 3031 and the second connecting segment 3032 are arranged at an angle, which facilitates adaptation to different sizes of battery cells 1. The angle between the first direction Z and the second direction X is 90 degrees.

[0043] In one embodiment, such as Figure 2 and Figure 3 As shown, along the second direction X, the output section 302 is located between the positive electrode 1021 and the negative electrode 1022.

[0044] In this embodiment, such as Figure 2 and Figure 3As shown, the output section 302 is located centrally between the positive tab 1021 and the negative tab 1022 in the second direction X. This symmetrical layout makes the path length and impedance of the current from the positive tab 1021 and the negative tab 1022 to the positive and negative contacts of the output terminal 2 more balanced. Simultaneously, after the flexible circuit board 3 is bent, the "gap" area between the positive tab 1021 and the negative tab 1022 can be effectively filled and utilized, resulting in a compact structure and higher space utilization of the entire top sealing area 101.

[0045] In one embodiment, such as Figure 2 As shown, along the second direction X, the distance H between the first connecting segment 3031 and the third connecting segment 3041 is greater than 0.5 mm.

[0046] In this embodiment, such as Figure 2 As shown, the minimum safe distance H between the first connecting segment 3031 and the third connecting segment 3041 is greater than 0.5mm. In high-density integrated designs, this effectively prevents the risk of inter-electrode short circuits caused by manufacturing tolerances, material moisture absorption, or contamination. While pursuing miniaturization and high energy density, it ensures the basic safety and reliability of the product.

[0047] In one embodiment, such as Figure 2 and Figure 3 As shown, a positive electrode pad 305 is provided on the flexible circuit board 3. The positive electrode pad 305 is connected to the second connecting section 3032. The positive electrode pad 305 and the positive electrode tab 1021 are fixed by laser welding.

[0048] In one embodiment, such as Figure 2 and Figure 3 As shown, the flexible circuit board 3 is provided with a negative electrode pad 306, which is connected to the fourth connecting section 3042. The negative electrode pad 306 and the negative electrode tab 1022 are fixed by laser welding.

[0049] In this embodiment, the positive electrode tab 1021 and the negative electrode tab 1022 are connected to the corresponding positive electrode pad 305 and negative electrode pad 306 via laser welding. Laser welding technology features high energy density, fast welding speed, small heat-affected zone, large weld depth-to-width ratio, and no need for solder. Compared with traditional tin soldering, it can form solder joints with higher strength, lower resistance, and smaller volume, making it suitable for achieving highly reliable and low-loss connections in the space-constrained top sealing area 101. It also avoids the potential corrosion risk caused by flux residue, improving long-term connection stability.

[0050] In one embodiment, a seal is also included, which is wrapped around the output portion 302 and disposed between the output portion 302 and the encapsulation member 4.

[0051] In this embodiment, the seal is wrapped around the output part 302 and is placed between the output part 302 and the encapsulation part 4. The seal has an insulating function and can block the penetration of media such as moisture and electrolyte vapor, thereby greatly improving the sealing protection level of the output part 302, which is crucial for extending the cycle life of the battery cell 1 and ensuring safe use.

[0052] Specifically, the seal can be a conventional insulating sealing film.

[0053] The following two examples illustrate... Figures 1 to 5 A comprehensive explanation of all the above-mentioned plans is provided.

[0054] Example 1 This embodiment provides a battery, including a cell 1, with a top sealing region 101 at one end along a first direction Z. Within the top sealing region 101, a positive electrode tab 1021 and a negative electrode tab 1022 are provided, extending from inside the cell 1.

[0055] The flexible circuit board 3 has an input section 301 and a bendable output section 302. The input section 301 of the flexible circuit board 3 is located in the top sealing area 101, and the input section 301 is provided with a positive pad 305 and a negative pad 306. Using laser welding technology, the positive tab 1021 is welded to the positive pad 305, and the negative tab 1022 is welded to the negative pad 306. The flexible circuit board 3 has a positive trace 303 and a negative trace 304 internally, which are led out from the positive pad 305 and the negative pad 306 respectively and extend to the output section 302.

[0056] The output section 302 has an output terminal 2 at its end for connecting to external electrical equipment. The output terminal 2 has a positive contact and a negative contact, which are connected to the ends of the positive trace 303 and the negative trace 304 inside the flexible circuit board 3, respectively. A first protective element 5 (such as a surface mount fuse) is soldered in series on the positive trace 303, and a second protective element 6 (such as a thermistor) is soldered in series on the negative trace 304 to achieve overcurrent and temperature protection functions.

[0057] Then, the entire top sealing area 101 is encapsulated using a packaging component 4 (e.g., an aluminum-plastic film) to securely encapsulate and protect the positive tab 1021, negative tab 1022, input section 301, and part of the output section 302. To further improve sealing reliability, an insulating sealing film can be applied to the output section 302 before applying the packaging component 4.

[0058] During or after packaging, the output part 302 can be bent along the third direction Y (thickness direction of cell 1) to fit against the side of cell 1, thereby reducing the height of the protrusion of the head of cell 1 along the first direction Z, increasing the size of cell 1, and thus increasing the energy density of cell 1.

[0059] Example 2 Based on Example 1, the wiring layout of the flexible circuit board 3 was refined to achieve optimal electrical safety and space utilization in a complex space.

[0060] The positive electrode trace 303 on the flexible circuit board 3 specifically includes a first connecting segment 3031 and a second connecting segment 3032 at an angle of approximately 90 degrees. The first connecting segment 3031 is connected to the positive electrode contact of the output terminal 2, and its extension direction is parallel to the first direction Z. The second connecting segment 3032 is connected to the positive electrode pad 305, and its extension direction is parallel to the second direction X.

[0061] Similarly, the negative electrode trace 304 includes a third connecting segment 3041 and a fourth connecting segment 3042 at an angle of approximately 90 degrees. The third connecting segment 3041 is connected to the negative electrode contact of the output terminal 2, and its extension direction is parallel to the first direction Z. The fourth connecting segment 3042 is connected to the negative electrode pad 306, and its extension direction is parallel to the second direction X.

[0062] The positive electrode tab 1021 and the negative electrode tab 1022 are not aligned in the second direction X, but are spaced apart. The output section 302 and the output terminal 2 are located exactly between the positive electrode tab 1021 and the negative electrode tab 1022 in the second direction X. Correspondingly, the positive electrode pad 305 and the negative electrode pad 306 are also staggered in the second direction X.

[0063] This layout allows the positive and negative tabs 1021 and 1022, along with their connecting lines, to be staggered in three-dimensional space rather than stacked when the output section 302 is bent, maximizing the use of the limited planar area. To ensure safety, the minimum distance between the first connecting section 3031 and the third connecting section 3041 is H, which is greater than 0.5 mm, to provide a reliable electrical insulation gap.

[0064] The wiring layout scheme in this embodiment solves the electrical isolation problem caused by three-dimensional spatial compression through ingenious two-dimensional planar wiring.

[0065] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended application.

Claims

1. A battery, characterized in that, include: The battery cell (1) includes an electrode assembly (103) and a package (4). The electrode assembly (103) has a top sealing region (101) at one end along a first direction (Z). The electrode assembly (103) is connected to a tab assembly (102), and at least a portion of the tab assembly (102) is disposed in the top sealing region (101). The flexible circuit board (3) has an input section (301) and an output section (302) that are electrically connected. The input section (301) is connected to the tab assembly (102). The input section (301) is disposed in the top sealing area (101). The output section (302) is bendable and is wrapped with the package (4).

2. The battery according to claim 1, characterized in that, The output section (302) is adapted to output electrical energy, and the output section (302) can be bent toward the electrode assembly (103) to reduce the space occupied by the output section (302) in the first direction (Z).

3. The battery according to claim 1, characterized in that, The output section (302) is provided with a positive contact and a negative contact. The flexible circuit board (3) is provided with a positive trace (303) and a negative trace (304). The tab assembly (102) includes a positive tab (1021) and a negative tab (1022). One end of the positive trace (303) is connected to the positive tab (1021) and the other end is connected to the positive contact. One end of the negative trace (304) is connected to the negative tab (1022) and the other end is connected to the negative contact.

4. The battery according to claim 3, characterized in that, It also includes a first protection element (5) and a second protection element (6), both of which are disposed on the output section (302). The positive electrode line (303) is connected to the positive electrode contact through the first protection element (5), and the negative electrode line (304) is connected to the negative electrode contact through the second protection element (6).

5. The battery according to claim 3, characterized in that, The positive electrode trace (303) includes a first connecting segment (3031) and a second connecting segment (3032). The first connecting segment (3031) is connected to the positive electrode contact and extends along the first direction (Z). The second connecting segment (3032) is connected to the positive electrode tab (1021) and extends along the second direction (X). The first direction (Z) and the second direction (X) are set at an angle that is neither 0° nor 180°.

6. The battery according to claim 5, characterized in that, The negative electrode trace (304) includes a third connecting segment (3041) and a fourth connecting segment (3042). The third connecting segment (3041) is connected to the negative electrode contact and extends along the first direction (Z). The fourth connecting segment (3042) is connected to the negative electrode tab (1022) and extends along the second direction (X). The first direction (Z) and the second direction (X) are set at an angle that is neither 0 degrees nor 180 degrees.

7. The battery according to claim 6, characterized in that, Along the second direction (X), the output section (302) is located between the positive electrode (1021) and the negative electrode (1022).

8. The battery according to claim 6, characterized in that, Along the second direction (X), the distance H between the first connecting segment (3031) and the third connecting segment (3041) is greater than 0.5 mm.

9. The battery according to claim 6, characterized in that, The flexible circuit board (3) is provided with a positive electrode pad (305), the positive electrode pad (305) is connected to the second connecting section (3032), and the positive electrode pad (305) is fixed to the positive electrode tab (1021) by laser welding.

10. The battery according to claim 6, characterized in that, The flexible circuit board (3) is provided with a negative electrode pad (306), the negative electrode pad (306) is connected to the fourth connecting segment (3042), and the negative electrode pad (306) and the negative electrode tab (1022) are fixed by laser welding.

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