Battery pack

Abstract

The utility model discloses a battery pack, which comprises a battery cell, a battery pack and a battery pack, the fusion circuit board comprises a fusion circuit board body, the fusion circuit board body comprises a first surface and a second surface which are deviated from each other, the first surface is provided with a conducting strip electrically connected with the tab, and the second surface is provided with an electronic component and an output end; and the fusion circuit board body is provided with an opening penetrating through the thickness of the fusion circuit board body to communicate the first surface with the second surface at a position corresponding to the conducting strip. According to the battery pack, the tab adapter plate and the protection plate in the prior art are fused into a whole to form an integrated assembly, namely a fused circuit board, so that one circuit board is saved, the overall structure of the battery pack is simplified, and the battery pack is convenient to assemble and maintain. The integrated fusion circuit board is small in overall size and compact in structure, the space utilization rate of the battery is high, and the energy density of the battery can be improved. According to the integrated fusion circuit board, current channels are reduced, heat dissipation is reduced, the stability of the battery is improved, and the overall performance of the battery pack is good.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more specifically, to a battery pack. Background Art

[0002] Battery packs are widely used in modern electronic devices.

[0003] In the related art, a battery pack generally includes battery cells, an ear connecting plate, and a protection board. The ears of the battery cells are connected to the protection board through the ear connecting plate. That is to say, the ear connecting plate and the protection board are independent split structural parts. When assembling the battery pack, the ears are connected to the ear connecting plate, and the ear connecting plate is connected to the protection board, which results in cumbersome assembly and inconvenient maintenance of the battery pack.

[0004] Therefore, how to provide a battery pack that is convenient for assembly and maintenance is an urgent problem to be solved by those skilled in the art at present. Summary of the Utility Model

[0005] In view of this, the purpose of the utility model is to provide a battery pack that is convenient for assembly and maintenance.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A battery pack, comprising:

[0008] Battery cells, including ears;

[0009] A fusion circuit board, including a fusion circuit board body. The fusion circuit board body includes a first surface and a second surface facing away from each other. The first surface is provided with conductive sheets electrically connected to the ears, and the second surface is provided with electronic components and output terminals;

[0010] At a position corresponding to the conductive sheet on the fusion circuit board body, an opening is provided that penetrates through its thickness to communicate the first surface and the second surface.

[0011] Optionally, the conductive sheets are respectively welded to the ears and the first surface, and the conductive sheets at least cover a part of the opening.

[0012] Optionally, the ear has a bent portion, and the bent portion is in close contact with the conductive sheet.

[0013] Optionally, the bent portion is formed by bending the ear at a position preset distance from its free end in a preset direction;

[0014] The number of the battery cells is at least two, and all the battery cells are stacked. The bent portions of the positive electrode tabs of any two adjacent battery cells are flush-docked or overlapped with the bent portions of the negative electrode tabs of the other battery cell, and the two flush-docked or overlapped bent portions are in contact with the same conductive sheet; the bent portions of the positive electrode tabs of one of the two outermost battery cells and the bent portions of the negative electrode tabs of the other battery cell are respectively in contact with two separate conductive sheets.

[0015] Optionally, both the positive electrode B+ and the negative electrode B- of the battery pack are provided on the second surface, and are both located on one side of the first center line in the length direction of the second surface, and the positive electrode B+ and the negative electrode B- are respectively located on both sides of the second center line in the width direction of the second surface.

[0016] Optionally, the output terminal is provided between the connection line of the positive electrode B+ and the negative electrode B- and the edge portion of the first side of the second surface, the output positive electrode of the output terminal is connected to the positive electrode B+, and the output negative electrode of the output terminal is connected to the negative electrode B-.

[0017] Optionally, the projections of the output terminal and the electronic component on the first surface do not overlap with the conductive sheet.

[0018] Optionally, the electronic component includes:

[0019] A first electronic component, which is provided on the fourth side of the first center line of the second surface, and the fourth side and the first side are on both sides of the first center line;

[0020] A second electronic component, the projection of which on the first surface is located between different conductive sheets;

[0021] A third electronic component, which is provided between the output terminal and the connection line of the positive electrode B+ and the negative electrode B-.

[0022] Optionally, the number of the battery cells is at least two. A first buffer pad is provided between two battery cells with opposite deep-pit surfaces, and a second buffer pad is provided between two battery cells with opposite shallow-pit surfaces, and the thickness of the second buffer pad is greater than the thickness of the first buffer pad.

[0023] Optionally, the number of the battery cells is at least two. An adhesive layer is provided between two battery cells with opposite deep-pit surfaces, and a third buffer pad is provided between two battery cells with opposite shallow-pit surfaces.

[0024] Optionally, the number of the battery cells is at least two. An ear buffer pad is provided between the ears of two battery cells with opposite deep-pit surfaces, and the ear buffer pad is in contact with the first surface of the fusion circuit board.

[0025] The beneficial effects of the battery pack provided by the present utility model are as follows:

[0026] The tab of the battery cell is directly connected to the integrated circuit board through a conductive sheet. At the same time, the electronic components and output terminals provided on the second surface of the integrated circuit board are used to ensure connection with other battery components, ensuring the normal operation of the battery.

[0027] That is to say, this battery pack is equivalent to integrating the mutually independent tab adapter board and protection board in the prior art into one body to form an integrated component, namely the integrated circuit board. One side of the integrated circuit board is used to connect with the tab of the battery cell, and the other side is used to arrange electronic components and output terminals, thus saving a circuit board, reducing the number of components, reducing the fixation of a circuit board, and simplifying the overall structure of the battery pack. During assembly, the first surface of the integrated circuit board is oriented towards the tab, and the tab is connected corresponding to the conductive sheet, which can improve the convenience of battery pack assembly and maintenance, and improve the assembly efficiency. In addition, after saving a circuit board, the overall volume of the integrated integrated circuit board is relatively small, the structure is compact, and the space utilization rate of the battery is high, thus improving the battery energy density. Moreover, compared with the connection of the battery cell tab through the tab adapter board and the protection board, the integrated integrated circuit board reduces the current flow path, reduces heat dissipation, improves the battery stability, and makes the overall performance of the battery pack better. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0029] Figure 1 It is a schematic structural diagram of the battery pack provided by a specific embodiment of the present utility model;

[0030] Figure 2 For Figure 1 The partial enlarged view of A in

[0031] Figure 3 For Figure 1 The schematic diagram of the bending situation of the tabs of all battery cells of the battery pack shown;

[0032] Figure 4 For Figure 1 The schematic structural diagram of another perspective of the battery pack shown;

[0033] Figure 5 It is a schematic structural diagram of the integrated circuit board;

[0034] Figure 6 Schematic diagram of the first surface of the integrated circuit board;

[0035] Figure 7 Schematic diagram of the second surface of the integrated circuit board;

[0036] Figure 8 is Figure 1 Exploded view of the battery pack shown;

[0037] Figure 9 is Figure 8 Schematic diagram of the assembled structure.

[0038] Reference numerals:

[0039] 1 - battery cell; 11 - tab; 111 - bent portion; 2 - integrated circuit board; 21 - first surface; 211 - conductive sheet; 22 - second surface; 221 - electronic component; 2211 - first electronic component; 2212 - second electronic component; 2213 - third electronic component; 222 - output terminal; 223 - opening; 224 - positive electrode B+; 225 - negative electrode B-; 23 - first side; 24 - second side; 25 - third side; 26 - fourth side; 3 - adhesive layer; 4 - third buffer pad; 5 - tab buffer pad; 6 - fiber tape. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0041] The core of the present invention is to provide a battery pack, which is convenient for assembly and maintenance.

[0042] Please refer to Figure 1 、 Figure 2 and Figure 4 In an embodiment of the present invention, a battery pack is provided, including a battery cell 1 and an integrated circuit board 2. The battery cell 1 includes a tab 11, and the integrated circuit board 2 includes an integrated circuit board body. The integrated circuit board body includes a first surface 21 and a second surface 22. The first surface 21 and the second surface 22 are two opposite surfaces on the integrated circuit board body. The first surface 21 is provided with a conductive sheet 211 for electrically connecting with the tab 11, and the second surface 22 is provided with an electronic component 221 and an output terminal 222.

[0043] That is to say, for the battery pack provided in this embodiment, the tab 11 of the battery cell 1 is directly connected to the integrated circuit board 2 through the conductive sheet 211. At the same time, the electronic components 221 and the output terminal 222 provided on the second surface 22 of the integrated circuit board 2 are used to ensure connection with other battery components and guarantee the normal operation of the battery.

[0044] That is, this battery pack is equivalent to integrating the tab adapter board and the protection board, which are independent in the prior art, into one body to form an integrated component, that is, the integrated circuit board 2. One side of the integrated circuit board 2 is used to connect to the tab 11 of the battery cell 1, and the other side is used to arrange the electronic components 221 and the output terminal 222, thus saving a circuit board, reducing the number of components, and reducing the fixation of a circuit board, thereby simplifying the overall structure of the battery pack. During assembly, the first surface 21 of the integrated circuit board 2 is oriented towards the tab 11, and the tab 11 is connected to the conductive sheet 211 correspondingly, which can improve the convenience of battery pack assembly and maintenance and enhance the assembly efficiency. In addition, after saving a circuit board, the overall volume of the integrated integrated circuit board 2 is relatively small, the structure is compact, and the space utilization rate of the battery is high, thereby improving the battery energy density. Moreover, compared with the connection of the tab 11 of the battery cell 1 to the protection board through the tab adapter board, the integrated integrated circuit board 2 reduces the current flow path, reduces heat dissipation, and improves the battery stability, making the overall performance of the battery pack better.

[0045] It should be noted that the specific material of the conductive sheet 211 is not limited in this embodiment, as long as the conductive sheet 211 can achieve electrical connection with the tab 11. In some embodiments, the conductive sheet 211 is a nickel sheet.

[0046] Please refer to Figure 5 , in order to facilitate the connection between the tab 11 and the conductive sheet 211, in some embodiments, the integrated circuit board body is provided with an opening 223 that penetrates its thickness to communicate the first surface 21 and the second surface 22 at the position corresponding to the conductive sheet 211. It can be understood that the setting of the opening 223 makes the first surface 21 and the second surface 22 communicate with each other. In this way, when connecting the tab 11 and the conductive sheet 211, it is convenient to operate through the opening 223 to facilitate the connection between the tab 11 and the conductive sheet 211.

[0047] Further, in some embodiments, the conductive sheet 211 is respectively welded and connected to the tab 11 and the first surface 21, and the conductive sheet 211 at least covers a part of the opening 223. That is to say, in this embodiment, the opening 223 is used to allow the welding heat source to pass through, so as to weld and fix the tab 11 and the conductive sheet 211. That is to say, when fixing the tab 11 and the conductive sheet 211, the welding heat source is made to pass from the second surface 22 of the fusion circuit board 2 through the opening 223 to the conductive sheet 211 and the tab 11 located on the first surface 21, thereby welding the conductive sheet 211 and the tab 11 together. It should be noted that the welding heat source is not specifically limited in this embodiment. For example, the welding heat source can be a laser. That is, the laser is used to weld the conductive sheet 211 and the tab 11 together through the opening 223 to achieve laser welding. In addition, the specific size of the opening 223 is not limited in this embodiment, as long as it can allow enough welding heat source to pass through to achieve the welding of the tab 11 and the conductive sheet 211. In addition, it can be understood that the number of the openings 223 is the same as the number of the conductive sheets 211, and the positions of the openings 223 correspond to the positions of the conductive sheets 211. Further, in order to improve the reliability of the connection between the tab 11 and the conductive sheet 211, in some embodiments, the tab 11 has a bent portion 111, and the bent portion 111 is in close contact with the conductive sheet 211. That is to say, in this embodiment, the tab 11 is bent to form the bent portion 111, so that the bent portion 111 is in close contact with the conductive sheet 211, so as to increase the contact area between the tab 11 and the conductive sheet 211, make the tab 11 and the conductive sheet 211 be flatly connected, and thus improve the reliability of the connection between the tab 11 and the conductive sheet 211. It can be understood that the battery pack usually includes at least two battery cells 1, and different battery cells 1 are stacked. In some embodiments, the positive and negative tabs 11 of different battery cells 1 can be bent according to a preset connection scheme and then connected to the corresponding conductive sheets 211.

[0048] It should be noted that the above embodiments do not limit the specific number and distribution of the conductive sheets 211. The number of the conductive sheets 211 can be determined according to the specific distribution of the bent portions 111 of the tabs 11 of all the battery cells 1. Similarly, the distribution of the conductive sheets 211 corresponds to the distribution of the tabs 11. As Figure 6 shown, a distribution of the conductive sheets 211 is disclosed.

[0049] Please refer to Figure 3, in some embodiments, the bent portion 111 is formed by bending the tab 11 at a position preset distance from its free end in a preset direction; the number of the battery cells 1 is at least two, and all the battery cells 1 are stacked. The bent portion 111 of the positive tab of one of any two adjacent battery cells 1 is flush-docked or overlapped with the bent portion 111 of the negative tab of the other battery cell 1, and the two flush-docked or overlapped bent portions 111 are in contact with the same conductive sheet 211; the bent portion 111 of the positive tab of one of the outermost two battery cells 1 and the bent portion 111 of the negative tab of the other battery cell 1 are respectively in contact with two separate conductive sheets 211.

[0050] That is to say, in this embodiment, any two adjacent battery cells 1 are connected in series by connecting the positive tab of one battery cell 1 and the negative tab of the other battery cell 1 to the same conductive sheet 211 respectively. In this way, all the stacked battery cells 1 are connected in series. Finally, the positive tab of one of the outermost two battery cells 1 is separately connected to a conductive sheet 211, and the negative tab of the other battery cell 1 is separately connected to a conductive sheet 211.

[0051] It can be understood that the positive tab of one of the outermost two battery cells 1 and the negative tab of the other battery cell 1 are respectively connected to the positive electrode B+224 and the negative electrode B-225 of the battery pack. The positive electrode B+224 of the battery pack refers to the electrode with the highest potential after all the battery cells 1 are connected in series, and the negative electrode B-225 of the battery pack refers to the electrode with the lowest potential after all the battery cells 1 are connected in series.

[0052] In addition, please refer to Figure 7 , in some embodiments, both the positive electrode B+224 and the negative electrode B-225 of the battery pack are arranged on the second surface 22 and are both located on the first side 23 of the first center line in the length direction of the second surface 22, and the positive electrode B+224 and the negative electrode B-225 are respectively located on both sides of the second center line in the width direction of the second surface 22. For the convenience of understanding, both sides of the second center line in the width direction of the second surface 22 are respectively called the second side 24 and the third side 25. It can be understood that the positive electrode B+224 and the negative electrode B-225 of the battery pack are located on the opposite sides of the corresponding tab 11 and are led out from the welding position area of the corresponding tab 11, so as to facilitate the connection between the battery cell 1 and other battery components. Both the positive electrode B+224 and the negative electrode B-225 are located on the first side 23 of the first center line in the length direction of the second surface 22, and the positive electrode B+224 and the negative electrode B-225 are arranged vertically and are respectively located on the second side 24 and the third side 25 of the second center line in the width direction of the second surface 22. In this way, it is convenient to ensure the orderliness of the connection between the positive electrode B+224 and the negative electrode B-225 of the battery pack.

[0053] Furthermore, please continue to refer to Figure 7, in some embodiments, the output terminal 222 is disposed between the connection line of the positive electrode B+224 and the negative electrode B-225 and the edge portion of the first side 23 of the second surface 22. The positive electrode of the output terminal of the output terminal 222 is connected to the positive electrode B+224, and the negative electrode of the output terminal of the output terminal 222 is connected to the negative electrode B-225. This can shorten the total positive and negative current flow paths of the fusion circuit board 2, which is beneficial to reducing the current flow path to a lower level, reducing the heat generated by large currents, and enhancing the safety of the fusion circuit board 2.

[0054] Furthermore, in order to simplify the welding operation of the tab 11, in some embodiments, the distance between the output terminal 222 and the edge portion of the first side 23 of the second surface 22 of the fusion circuit board 2 is ≤6 mm. That is, the output terminal 222 is arranged as close as possible to the edge of the first side 23 to save the layout space of the fusion circuit board 2, increase the welding area of the tab 11, and facilitate the internal wiring design of the fusion circuit board 2.

[0055] In addition, in some embodiments, the projections of the output terminal 222 and the electronic component 221 on the first surface 21 do not overlap with the conductive sheet 211. That is to say, the output terminal 222 and the electronic component 221 are not located at the position of the opening 223 to ensure the safety of the fusion circuit board 2.

[0056] Furthermore, in some embodiments, the distance between the projection of the electronic component 221 on the first surface 21 and the conductive sheet 211 is ≥2 mm. That is to say, a certain distance is maintained between the electronic component 221 and the position of the opening 223 to improve the safety of the fusion circuit board 2.

[0057] In addition, it can be understood that the opening 223 for connecting the tab 11 opened at the position of the second surface 22 of the fusion circuit board 2 corresponding to the conductive sheet 211 can reduce the influence of the temperature of the electronic component 221 during operation on each other and improve the stability of the battery pack.

[0058] In addition, the above embodiments do not limit the specific quantity and distribution of the electronic components 221, as long as the required electronic components 221 can be arranged on the second surface 22 of the fusion circuit board 2.

[0059] Please continue to refer to Figure 7, in some embodiments, the electronic component 221 includes a first electronic component 2211, a second electronic component 2212, and a third electronic component 2213. The first electronic component 2211 is disposed on the fourth side 26 of the first center line of the second surface 22 of the integrated circuit board 2, and the fourth side 26 and the first side 23 are on both sides of the first center line; the projection of the second electronic component 2212 within the first surface 21 is located between different conductive sheets 211; the third electronic component 2213 is disposed between the output terminal 222 and the connection line of the positive electrode B+224 and the negative electrode B-225. That is to say, in this embodiment, the electronic component 221 is divided into three parts, namely the first electronic component 2211, the second electronic component 2212, and the third electronic component 2213. In terms of the projection within the first surface 21, one part of the electronic component 221 (such as the second electronic component 2212) is located between the conductive sheets 211, another part of the electronic component 221 (such as the third electronic component 2213) is located on the first side 23 of the first center line of the second surface 22 of the integrated circuit board 2, and the third part of the electronic component 221 (such as the first electronic component 2211) is located on the fourth side 26 of the first center line of the second surface 22 of the integrated circuit board 2. In this way, it is beneficial to make the distribution of the electronic component 221 on the second surface 22 of the integrated circuit board 2 more uniform, avoid the concentration of the electronic component 221 in a certain area range of the second surface 22 of the integrated circuit board 2, and thus is beneficial to heat dissipation and the like. It should be noted that the first electronic component 2211, the second electronic component 2212, and the third electronic component 2213 may respectively have multiple quantities and corresponding distributions and the like.

[0060] In addition, in some embodiments, the number of the battery cells 1 is at least two. A first buffer pad is provided between two battery cells 1 with opposite deep pit surfaces, and a second buffer pad is provided between two battery cells 1 with opposite shallow pit surfaces. The thickness of the second buffer pad is greater than that of the first buffer pad. It can be understood that more than two battery cells 1 in the battery pack are stacked and fixed, and finally, the stacked battery cell group 1 is enclosed and fixed by a connecting member on the outside of the stacked battery cell group 1. For example, by pasting a fiber tape 6 on the outside of the stacked battery cell group 1, circumferential limiting of the stacked battery cell group 1 is performed. Since the thickness of the battery cells 1 in the battery pack will increase after a certain number of charge and discharge cycles, and the buffer pads (such as the first buffer pad and the second buffer pad) have compressibility, therefore, setting buffer pads between the battery cells 1 can absorb the expansion between the battery cells 1. In this way, the connecting member (such as the fiber tape 6) on the outside of the stacked battery cell group 1, such as Figure 8When the battery cells 1 are fixed as shown, the outward expansion tendency of the battery cells 1 can be restricted, allowing the battery cells 1 to expand inwardly against the buffer pads, preventing the battery cells 1 from expanding into the external space and affecting the battery pack housing, thereby maintaining a stable size of the battery pack, improving the stability of the battery pack, and optimizing the utilization rate of the battery space. In this embodiment, buffer pads are provided between two battery cells 1 facing each other on the deep pit surface and between two battery cells 1 facing each other on the shallow pit surface, and the effect of absorbing the expansion of the battery cells 1 is better; in addition, the thickness of the second buffer pad is greater than the thickness of the first buffer pad, which is beneficial to maintaining the consistency of the distance between the tabs 11.

[0061] Please refer to Figure 8 , in some other embodiments, the number of battery cells 1 is at least two, an adhesive layer 3 is provided between two battery cells 1 facing each other on the deep pit surface, and a third buffer pad 4 is provided between two battery cells 1 facing each other on the shallow pit surface. That is to say, in this embodiment, no buffer pad is provided between two battery cells 1 facing each other on the deep pit surface, and a buffer pad, that is, the third buffer pad 4, is provided between two battery cells 1 facing each other on the shallow pit surface, so as to make full use of the third buffer pad 4 to absorb the outward expansion tendency of two battery cells 1 facing each other on the shallow pit surface.

[0062] In addition, please refer to Figure 9 , in some embodiments, the number of battery cells 1 is at least two, a tab buffer pad 5 is provided between the tabs 11 of two battery cells 1 facing each other on the deep pit surface, and the tab buffer pad 5 is in contact with the first surface 21 of the integrated circuit board 2. When the integrated circuit board 2 is subjected to an external impact, the tab buffer pad 5 can absorb the external impact acting on the integrated circuit board 2 because it has the functions of absorbing impact and absorbing vibration, preventing the external impact from pulling the tabs 11, and thus reducing the influence of the external impact on the battery cells 1.

[0063] It should be noted that the specific materials of the first buffer pad, the second buffer pad, the third buffer pad 4, and the tab buffer pad 5 in this embodiment are not limited, as long as they are compressible and can absorb expansion deformation or absorb impact vibration. In some embodiments, the first buffer pad, the second buffer pad, the third buffer pad 4, and the tab buffer pad 5 are respectively made of foam.

[0064] Next, taking the Figure 8 and Figure 9 shown battery pack as an example, the assembly process of the battery pack will be introduced.

[0065] Two adjacent battery cells 1 facing each other on the deep pit surface are pasted together through the adhesive layer 3, and two adjacent battery cells 1 facing each other on the shallow pit surface are pasted together through the third buffer pad 4, and all the battery cells 1 are stacked and fixed;

[0066] A fiber tape 6 is pasted on the outside of the stacked battery cells 1 group;

[0067] Place the integrated circuit board 2 above the tab 11 of the battery cell 1 group through a fixture, bend the positive tab 11 and the negative tab 11 of the battery cell 1 group in sequence below the first surface 21 of the integrated circuit board 2, so that the bent positive tab 11 and negative tab 11 are respectively in flat contact with the corresponding conductive sheet 211. Then, perform laser welding on the tab 11 and the conductive sheet 211 through the opening 223 of the integrated circuit board 2 to integrally connect the tab 11 and the conductive sheet 211 together;

[0068] Finally, insert the tab buffer pad 5 between the tabs 11 of the two battery cells 1 opposite to the integrated circuit board 2 and the deep pit surface, so as to realize the assembly of the battery pack.

[0069] It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0070] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0071] The battery pack provided by the present invention has been introduced in detail above. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: include: A battery cell (1), comprising a tab (11); A fused circuit board (2) comprising a fused circuit board body, the fused circuit board body comprising a first surface (21) and a second surface (22) which are separated from each other, the first surface (21) being provided with a conductive sheet (211) electrically connected to the tab (11), and the second surface (22) being provided with electronic components (221) and an output terminal (222); The fused circuit board body is provided with an opening (223) at a position corresponding to the conductive sheet (211) that penetrates through the thickness thereof to connect the first surface (21) and the second surface (22).

2. The battery pack according to claim 1, characterized in that: The conductive sheet (211) is respectively connected to the pole tab (11) and the first surface (21) by welding, and the conductive sheet (211) at least covers a portion of the opening (223).

3. The battery pack according to claim 1, characterized in that: The pole ear (11) has a bent portion (111), and the bent portion (111) is in close contact with the conductive sheet (211).

4. The battery pack according to claim 3, characterized in that: The bent portion (111) is formed by bending the pole ear (11) at a preset distance from its free end toward a preset direction; The number of the battery cells (1) is at least two, and all the battery cells (1) are stacked and arranged; the bent portion (111) of the positive pole lug of one of any two adjacent battery cells (1) is flush with or overlapped with the bent portion (111) of the negative pole lug of the other, and the two flush with or overlapped bent portions (111) are in close contact with the same conductive sheet (211); the bent portion (111) of the positive pole lug of one of the two outermost battery cells (1) and the bent portion (111) of the negative pole lug of the other are in close contact with one conductive sheet (211) respectively.

5. The battery pack according to any one of claims 1 to 4, characterized in that: The positive electrode B+ (224) and the negative electrode B- (225) of the battery pack are both arranged on the second surface (22), and are both located on the first side (23) of the first center line in the length direction of the second surface (22), and the positive electrode B+ (224) and the negative electrode B- (225) are respectively located on both sides of the second center line in the width direction of the second surface (22).

6. The battery pack according to claim 5, characterized in that: The output end (222) is arranged between the line connecting the positive electrode B+ (224) and the negative electrode B- (225) and the edge of the first side (23) of the second surface (22), and the output positive electrode of the output end (222) is connected to the positive electrode B+ (224), and the output negative electrode of the output end (222) is connected to the negative electrode B- (225).

7. The battery pack according to any one of claims 1 to 4, characterized in that: Projections of the output end (222) and the electronic component (221) within the first surface (21) do not overlap with the conductive sheet (211).

8. The battery pack according to claim 6, characterized in that: The electronic component (221) comprises: a first electronic component (2211) disposed on a fourth side (26) of the first center line of the second surface (22), the fourth side (26) and the first side (23) being two sides of the first center line; a second electronic component (2212), whose projection on the first surface (21) is located between different conductive sheets (211); The third electronic component (2213) is arranged between the output end (222) and the connection line between the positive electrode B+ (224) and the negative electrode B- (225).

9. The battery pack according to any one of claims 1 to 4, characterized in that: The number of the battery cells (1) is at least two, a first buffer pad is provided between two battery cells (1) with deep pit surfaces facing each other, and a second buffer pad is provided between two battery cells (1) with shallow pit surfaces facing each other, and the thickness of the second buffer pad is greater than the thickness of the first buffer pad.

10. The battery pack according to any one of claims 1 to 4, characterized in that: The number of the battery cells (1) is at least two, an adhesive layer (3) is provided between two battery cells (1) with deep pit surfaces facing each other, and a third buffer pad (4) is provided between two battery cells (1) with shallow pit surfaces facing each other.

11. The battery pack according to any one of claims 1 to 4, characterized in that: The number of the battery cells (1) is at least two, a tab buffer pad (5) is provided between the tabs (11) of the two battery cells (1) with opposite deep pit surfaces, and the tab buffer pad (5) is in contact with the first surface (21) of the fusion circuit board (2).

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