Battery module, battery pack, and electronic device

Abstract

The application provides a battery module, comprising a battery cell assembly and a first circuit board. The battery cell assembly comprises a plurality of battery cells connected to the first circuit board. The plurality of battery cells comprises a first battery cell and a second battery cell, and the first battery cell is arranged obliquely relative to the second battery cell. The first circuit board is arranged between the first battery cell and the second battery cell, and the first circuit board is arranged obliquely relative to the first battery cell and obliquely relative to the second battery cell. The battery module fully utilizes the space inside the battery by arranging the first circuit board in the space between the first battery cell and the second battery cell, and effectively improves the energy density. The application also provides a battery pack and an electronic device comprising the battery module.

Description

Technical Field

[0001] This application relates to the field of batteries, and more particularly to a battery module and a battery pack and electronic device having the battery module. Background Technology

[0002] With the miniaturization of wearable electronic devices, the requirements for batteries in these devices are becoming increasingly stringent. Batteries are occupying less and less space within these devices, and the battery compartments are often irregularly shaped. Therefore, how to rationally utilize the internal space of the battery and improve its energy density has become a problem that needs to be solved. Summary of the Invention

[0003] In view of the above, this application provides a battery module and a battery having the battery module, wherein the first battery cell is inclined relative to the second battery cell, and a first circuit board is disposed between the first battery cell and the second battery cell. The first circuit board is inclined relative to the first battery cell and the first circuit board is inclined relative to the second battery cell. By disposing of the first circuit board in the space between the first battery cell and the second battery cell, the internal space of the battery is fully utilized, and the energy density is effectively improved.

[0004] Embodiments of this application provide a battery module, including a cell assembly and a first circuit board. The cell assembly includes a plurality of cells, each cell including a housing and an electrode assembly housed within the housing. The electrode assembly includes tabs, and the plurality of cells are connected to the first circuit board. The plurality of cells includes a first cell and a second cell, with the first cell disposed at an angle relative to the second cell. The first circuit board is disposed between the first cell and the second cell, and is also disposed at an angle relative to both the first and second cells.

[0005] In some embodiments, along the thickness direction of the battery cell, the housing includes a first main plane and a second main plane disposed opposite to each other. Along the length direction of the battery cell, one end of the housing is provided with a sealing edge, and the electrode extends from the sealing edge out of the housing. The first battery cell includes a first electrode, and the second battery cell includes a second electrode, which are disposed opposite to each other. The housing also includes a first surface connecting the sealing edge and the first main plane, and a second surface connecting the sealing edge and the second main plane. Along the thickness direction, the width of the first surface is greater than the width of the second surface. One end of the first circuit board is inclined near the first surface of the first battery cell, and the other end of the first circuit board is inclined near the first surface of the second battery cell.

[0006] In some embodiments, the first circuit board is disposed between the first tab and the second tab.

[0007] In some embodiments, the first tab includes a first welding portion, and the second tab includes a second welding portion. The battery module includes a first connecting piece and a second connecting piece. The first connecting piece includes a first fixing portion and a first connecting portion, the first fixing portion being welded to the first circuit board, the first connecting portion being welded to the first welding portion, and the first welding portion being disposed between the first fixing portion and the first connecting portion. The second connecting piece includes a second fixing portion and a second connecting portion, the second fixing portion being welded to the first circuit board, the second connecting portion being welded to the second welding portion, and the second welding portion being disposed between the second fixing portion and the second connecting portion.

[0008] In some embodiments, the first fixing portion and the first connecting portion clamp the first welding portion, one surface of the first welding portion is in contact with the first connecting portion, and the other surface of the first welding portion is in contact with the first fixing portion. The second fixing portion and the second connecting portion clamp the second welding portion, one surface of the second welding portion is in contact with the second connecting portion, and the other surface of the second welding portion is in contact with the second fixing portion.

[0009] In some embodiments, the first welding portion is disposed between the first surface of the first battery cell and the first circuit board, and the second welding portion is disposed between the second surface of the second battery cell and the first circuit board.

[0010] In some embodiments, the first circuit board includes a first side and a second side disposed opposite to each other, the first electrode tab is disposed on the first side, and the second electrode tab is disposed on the second side.

[0011] In some embodiments, the first circuit board and the sealing edge of the first battery cell form an acute angle, the acute angle being 30-60°.

[0012] In some embodiments, the battery module further includes a first insulating member and a second insulating member, wherein the first insulating member covers at least a portion of the sealing edge of the first battery cell, and the second insulating member covers at least a portion of the sealing edge of the second battery cell.

[0013] In some embodiments, the first insulating member has a first opening, and the first electrode extends from the first opening; the second insulating member has a second opening, and the second electrode extends from the second opening.

[0014] Embodiments of this application also provide a battery pack, including a housing and a battery module as described in any of the above claims, wherein the battery module is housed within the housing.

[0015] In some embodiments, the battery pack further includes a second circuit board, one end of which is connected to the first circuit board of the battery module, and the other end of which extends out of the housing.

[0016] In some embodiments, the housing includes an arc-shaped base plate, the inner sidewall of which is provided with a first groove and a second groove. The battery pack further includes a first separator and a second separator, the first separator being disposed between a first cell of the battery module and the first groove, and the second separator being disposed between a second cell of the battery module and the second groove.

[0017] In some embodiments, the first spacer covers the first groove, and the second spacer covers the second groove.

[0018] In some embodiments, the radius of the arc of the arc-shaped base plate is 85-110 mm.

[0019] In some embodiments, the housing further includes a side plate and an arc-shaped cover plate, the side plate being disposed around the arc-shaped base plate, the arc-shaped cover plate being fixedly connected to the side plate, and the arc radius of the arc-shaped cover plate being 80-100mm.

[0020] In some embodiments, the battery pack further includes a fixing member, which includes a first bracket, a second bracket, and a connecting portion. The first bracket and the second bracket are respectively disposed on opposite sides of the connecting portion. The first cell of the battery module is disposed on the first bracket, the second cell is disposed on the second bracket, and the first circuit board is disposed on the connecting portion.

[0021] In some embodiments, the housing contains resin for filling the gap between the housing and the cell assembly of the battery module.

[0022] In some embodiments, the housing is provided with an injection port, and the resin is filled into the housing by low-pressure injection molding.

[0023] Embodiments of this application also provide an electronic device, the electronic device including an electrical component and a battery pack as described in any of the above claims, the electrical component being electrically connected to the battery pack.

[0024] In some embodiments, the battery cell is a pouch cell, and the electrode tabs are made of conductive metals or alloys, such as copper, aluminum, nickel, nickel-plated copper, nickel-plated aluminum, etc.

[0025] Embodiments of this application also provide an electronic device, the electronic device including an electrical component and a battery pack as described in any of the above claims, the electrical component being electrically connected to the battery pack.

[0026] In the aforementioned battery module, the first battery cell is tilted relative to the second battery cell, and a first circuit board is disposed between the first and second battery cells. By placing the first circuit board in the space between the first and second battery cells, the internal space of the battery is fully utilized, effectively improving energy density. Furthermore, the battery cell is a pouch cell, and the tabs of a pouch cell are easily bent. The tabs can be bent according to the tilt angle of the cell and the circuit board, further improving space utilization. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of a battery pack in one embodiment.

[0028] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the battery pack.

[0029] Figure 3 for Figure 1 A side view of the battery cells in the battery pack shown.

[0030] Figure 4 for Figure 3 The diagram shows a cross-sectional view of the battery cell.

[0031] Figure 5 for Figure 2 The diagram shows the structure of the battery module in the battery pack.

[0032] Figure 6 for Figure 5 A magnified view of a portion of the battery module shown.

[0033] Figure 7 for Figure 5 The diagram shows a cross-sectional view of the battery module.

[0034] Figure 8 for Figure 7 A magnified view of a portion of the battery module shown.

[0035] Figure 9 for Figure 5 The diagram shows the structure of the first cell in the battery module.

[0036] Figure 10 for Figure 5 The diagram shows the structure of the second cell in the battery module.

[0037] Figure 11 for Figure 1 The battery pack shown is a side view.

[0038] Figure 12 for Figure 1 The diagram shows a partial structural diagram of the outer casing of the battery pack.

[0039] Figure 13 This is an exploded structural diagram of a battery pack in one embodiment.

[0040] Figure 14 This is a simplified structural diagram of an electronic device in one embodiment.

[0041] Explanation of key component symbols:

[0042] Battery Module 100

[0043] Battery Cell 10

[0044] Casing 101

[0045] First principal plane 1011

[0046] Second principal plane 1012

[0047] Edge sealing 1013

[0048] First surface 1014

[0049] Second surface 1015

[0050] Electrode assembly 102

[0051] JE103

[0052] First cell 11

[0053] First Pole Ear 113

[0054] First Welding Section 1131

[0055] Second cell 12

[0056] Second pole ear 123

[0057] Second welding section 1231

[0058] Isolator 14

[0059] First circuit board 20

[0060] First side view 21

[0061] Second side 22

[0062] First connecting piece 30

[0063] First fixing part 31

[0064] First connecting part 32

[0065] Second connecting piece 40

[0066] Second fixing part 41

[0067] Second connecting part 42

[0068] Insulating component 50

[0069] First insulating component 51

[0070] First opening 511

[0071] Second insulating component 52

[0072] Second opening 521

[0073] Second circuit board 60

[0074] Casing 70

[0075] Arc-shaped base plate 71

[0076] First groove 711

[0077] Second groove 712

[0078] Side panel 72

[0079] Injection Hole 721

[0080] Curved cover plate 73

[0081] First isolation component 81

[0082] Second isolation component 82

[0083] Fastener 90

[0084] First support 91

[0085] Second support 92

[0086] Connecting part 93

[0087] Through hole 931

[0088] Battery pack 200

[0089] Electronic Devices 300

[0090] Electrical component 301 Detailed implementation method:

[0091] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0092] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is said to be "set on" another component, it can be directly set on the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0093] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0094] This application provides a battery module, including a cell assembly and a first circuit board. The cell assembly includes multiple cells connected to the first circuit board. The multiple cells include a first cell and a second cell, with the first cell disposed at an angle relative to the second cell. The first circuit board is disposed between the first cell and the second cell, and is also disposed at an angle relative to both the first and second cells.

[0095] The aforementioned battery module utilizes the internal space of the battery by setting a first circuit board in the space between the first and second battery cells, thereby effectively improving energy density.

[0096] Some embodiments of this application are described in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0097] Please see Figure 1 and Figure 2 In one embodiment, the battery pack 200 includes a battery module 100 and a housing 70, wherein the battery module 100 is housed within the housing 70. The battery module 100 includes a cell assembly and a first circuit board 20. The cell assembly includes a plurality of cells 10, which are connected to the first circuit board 20.

[0098] Please continue reading. Figure 3 and Figure 4In embodiments of this application, the plurality of battery cells 10 are pouch cells, each battery cell 10 including a housing 101 and an electrode assembly 102 housed within the housing 101. The electrode assembly 102 includes tabs 103 extending out of the housing 101. Along the thickness direction of the battery cell 10, Figure 4 As indicated by the middle arrow A, the housing 101 includes a first main plane 1011 and a second main plane 1012 disposed opposite to each other. Along the length of the battery cell 10, Figure 4 In the direction indicated by the middle arrow B, one end of the housing 101 is further provided with a sealing edge 1013, and the tab 103 extends out of the housing 101 from the sealing edge 1013. The housing 101 also includes a first surface 1014 and a second surface 1015. The first surface 1014 connects the sealing edge 1013 and the first main plane 1011, and the second surface 1015 connects the sealing edge 1013 and the second main plane 1012. Along the thickness direction, the width of the first surface 1014 is greater than the width of the second surface 1015.

[0099] Please see Figure 5 and Figure 6 In embodiments of this application, the plurality of battery cells 10 includes a first battery cell 11 and a second battery cell 12, with the first battery cell 11 being inclined relative to the second battery cell 12. The first battery cell 11 and the second battery cell 12 have substantially the same structure. In other embodiments, the plurality of battery cells 10 may also include a third battery cell, a fourth battery cell, etc., and this application is not limited thereto. The first circuit board 20 is disposed between the first battery cell 11 and the second battery cell 12. The first circuit board 20 is inclined relative to the first battery cell 11 and the second battery cell 12. The battery module 100 utilizes the space between the first battery cell 11 and the second battery cell 12 after the inclined arrangement to house the first circuit board 20, making full use of the internal space of the battery and effectively improving the energy density.

[0100] One end of the first circuit board 20 is inclined towards the first surface 1014 of the first battery cell 11, and the other end of the first circuit board 20 is inclined towards the first surface 1014 of the second battery cell 12. Since the width of the first surface 1014 is greater than the width of the second surface 1015, when both ends of the first circuit board 20 are inclined towards the first surface 1014, the larger width of the first surface 1014 can be better utilized to set the first circuit board 20. The first circuit board 20 and the sealing edge 1013 of the first battery cell 11 form an acute angle α. The range of the acute angle α can be adjusted according to the tilt angle of the battery cell 10 and the tilt angle of the first circuit board 20, with a preferred acute angle range of 30-60°.

[0101] The first surface 1014 of the first battery cell 11 is disposed opposite to the second surface 1015 of the second battery cell 12, and the second surface 1015 of the first battery cell 11 is disposed opposite to the first surface 1014 of the second battery cell 12.

[0102] Please continue reading. Figure 7 and Figure 8 The first battery cell 11 includes a first tab 113, and the second battery cell 12 includes a second tab 123. The first tab 113 and the second tab 123 are disposed opposite to each other. The first circuit board 20 is disposed between the first tab 113 and the second tab 123. The first tab 113 is inclined near the first surface 1014 of the first battery cell 11, and the second tab 123 is inclined near the second surface 1015 of the second battery cell 12. The first circuit board 20 includes a first side 21 and a second side 22 disposed opposite to each other. The first tab 113 is disposed on the first side 21, and the second tab 123 is disposed on the second side 22. The first tab 113 and the second tab 123 can be directly soldered to the first circuit board 20, for example, by SMT or DIP soldering, or connected to the first circuit board 20 by other connecting pieces. The first tab 113 and the second tab 123 are made of conductive metals or alloys, such as copper, aluminum, nickel, copper plated with nickel, aluminum plated with nickel, etc. The first tab 113 and the second tab 123 are easy to bend and can be bent at different angles according to the needs of the battery module 100, occupying less space.

[0103] Please continue reading. Figure 7 and Figure 8 In this embodiment, the battery module 100 further includes a first connecting piece 30 and a second connecting piece 40. The first connecting piece 30 is used to connect the first electrode 113 and the first circuit board 20, and the second connecting piece 40 is used to connect the second electrode 123 and the first circuit board 20. The first electrode 113 includes a first welding portion 1131, and the second electrode 123 includes a second welding portion 1231. The first connecting piece 30 includes a first fixing portion 31 and a first connecting portion 32. The first fixing portion 31 is welded to the first circuit board 20, and the first connecting portion 32 is welded to the first welding portion 1131. The first welding portion 1131 is disposed between the first fixing portion 31 and the first connecting portion 32. The second connecting piece 40 includes a second fixing portion 41 and a second connecting portion 42. The second fixing portion 41 is welded to the first circuit board 20, and the second connecting portion 42 is welded to the second welding portion 1231. The second welding portion 1231 is disposed between the second fixing portion 41 and the second connecting portion 42.

[0104] To facilitate the manufacturing of the battery module 100, before connecting the battery cell 10 to the first circuit board 20, the first connecting piece 30 and the second connecting piece 40 are L-shaped structures. The first fixing part 31 and the first connecting part 32 are arranged approximately perpendicularly, and the second fixing part 41 and the second connecting part 42 are also arranged approximately perpendicularly. The first welding part 1131 and the second welding part 1231 are welded to the first connecting part 32 and the second connecting part 42, respectively. The first fixing part 31 and the second fixing part 41 are welded to the first circuit board 20, and the first battery cell 11 and the second battery cell 12 are perpendicular to the first circuit board 20. Subsequently, the first electrode tab 113 and the second electrode tab 123 are bent so that the first welding part 1131 is sandwiched between the first fixing part 31 and the first connecting part 32, and the second welding part 1231 is sandwiched between the second fixing part 41 and the second connecting part 42. At the same time, the second battery cell 12 is tilted relative to the first battery cell 11, and the first circuit board 20 is tilted relative to the first battery cell 11 and the second battery cell 12. By setting the first connecting piece 30 and the second connecting piece 40, the space of the first circuit board 20 can be better utilized. For example, the first fixing part 31 and the second fixing part 41 can be soldered to different positions on the circuit board according to the design of the first circuit board 20. In addition, it is also beneficial to control the bending angle. For example, the first fixing part 31 and the first connecting part 32 can be bent to form different included angles according to the requirements.

[0105] In this embodiment, the first fixing part 31 and the first connecting part 32 clamp the first welding part 1131. One surface of the first welding part 1131 is in contact with the first connecting part 32, and the opposite surface of the first welding part 1131 is in contact with the first fixing part 31. The second fixing part 41 and the second connecting part 42 clamp the second welding part 1231. One surface of the second welding part 1231 is in contact with the second connecting part 42, and the opposite surface of the second welding part 1231 is in contact with the second fixing part 41. Through contact clamping, the first connecting piece 30 and the first welding part 1131 can be fixed more stably, preventing the first connecting piece 30 and the first welding part 1131 from separating in the event of a drop or other circumstances. In other examples, the opposite surface of the first welding part 1131 can also be fixedly connected to the first fixing part 31 in other ways, such as by adhesive.

[0106] Please see Figure 4 , Figure 9 and Figure 10The battery module 100 further includes an insulating member 50, which covers at least a portion of the sealing edge 1013 of the battery cell 10. The insulating member 50 includes a first insulating member 51 and a second insulating member 52. The first insulating member 51 covers at least a portion of the sealing edge 1013 of the first battery cell 11, and the second insulating member 52 covers at least a portion of the sealing edge 1013 of the second battery cell 12. The first insulating member 51 has a first opening 511, through which the first tab 113 extends. The second insulating member 52 has a second opening 521, through which the second tab 123 extends. The insulating member 50 serves two purposes: firstly, it supports the sealing edge 1013 to prevent deformation; secondly, it isolates the tab 103, reducing the occurrence of short circuits.

[0107] Please refer to it again. Figure 1 and Figure 2 The battery pack 200 further includes a second circuit board 60, one end of which is connected to the first circuit board 20, and the other end of which extends out of the outer casing 70. In embodiments of this application, the second circuit board 60 is a flexible circuit board. Along the length of the cell assembly, the second circuit board 60 extends from one side of the outer casing 70.

[0108] The battery pack 200 further includes a separator 14, which is disposed on the first main plane 1011 and the second main plane 1012 of the battery cell 10 along the thickness direction. The separator 14 includes, but is not limited to, materials such as foam, for absorbing the expansion volume of the battery cell 10.

[0109] The outer casing includes an arc-shaped base plate 71, side plates 72 surrounding the arc-shaped base plate 71, and an arc-shaped cover plate 73. The side plates 72 and the arc-shaped base plate 71 are integrally formed. The side edge of the arc-shaped cover plate 73 is fixedly connected to the side plate 72, and the fixing method includes, but is not limited to, snap-fitting, riveting, welding, and bonding. To reduce damage to the outer casing 70, the second circuit board 60 extends from between the arc-shaped cover plate 73 and the side plate 72. (See also...) Figure 11 The arc radius R1 of the arc-shaped base plate 71 is 85-110mm, and the arc radius R2 of the arc-shaped cover plate 73 is 80-100mm. In this embodiment, the arc-shaped base plate 71 is a one-piece molded plastic part, and the arc-shaped cover plate 73 is a steel sheet. The steel sheet improves the battery pack 200's resistance to impacts from the outside. Simultaneously, the steel sheet's integral design avoids harm to the user during battery failure. In one embodiment, the battery pack 200 is suitable for headphones, where the arc-shaped cover plate 73 is close to the user's head. The steel sheet has better strength than the plastic part, so when the battery fails, the arc-shaped base plate 71 will be damaged first, thus protecting the head.

[0110] Please see Figure 2 and Figure 12 The inner sidewall of the arc-shaped base plate 71 is provided with a first groove 711 and a second groove 712, which are used to provide expansion space for the first battery cell 11 and the second battery cell 12, respectively. The battery pack 200 also includes a first separator 81 and a second separator 82. The first separator 81 is disposed between the first battery cell 11 and the first groove 711, and the second separator 82 is disposed between the second battery cell 12 and the second groove 712. The first separator 81 covers the first groove 711, and the second separator 82 covers the second groove 712. The first separator 81 and the second separator 82 are used to support the first battery cell 11 and the second battery cell 12.

[0111] Please see Figure 13 In another embodiment, the structure of the battery pack 200 is largely the same as that of the aforementioned embodiment, except that the battery pack 200 further includes a fixing member 90 for fixing the cell assembly, the fixing member 90 being housed in the space between the outer casing 70 and the cell assembly. The fixing member 90 includes a first bracket 91, a second bracket 92, and a connecting portion 93, the first bracket 91 and the second bracket 92 being respectively disposed on opposite sides of the connecting portion 93. The first bracket 91 is inclined relative to the connecting portion 93, and the second bracket 92 is also inclined relative to the connecting portion 93. The first cell 11 is disposed on the first bracket 91, and the second cell 12 is disposed on the second bracket 92. The first circuit board 20 is inclinedly disposed on the connecting portion 93. In other embodiments, the fixing member 90 is resin used to fill the gap between the housing 70 and the battery cell assembly. The resin fills the gap between the housing 70 and the battery cell assembly to fix the battery cell assembly. The resin can be plastic. The side plate 72 of the housing 70 is provided with an injection hole 721. The resin is filled into the housing 70 through the injection hole 721 by low-pressure injection molding. The resin can flow from the through hole 931 into the space between the first battery cell 11, the second battery cell 12, and the first circuit board 20, ensuring that the gap between the three can be filled. The resin-filled battery pack 200 has a waterproof effect. In addition, the resin can also provide a certain degree of protection for the battery cell 10, preventing the battery cell 10 from being damaged in the event of a drop. In other embodiments, the resin is potting compound, which is filled into the housing 70 through the injection hole 721. In other embodiments, the fixing member 90 may also include a fixing bracket and resin at the same time to achieve better fixation.

[0112] Please see Figure 14 The embodiments of this application also provide an electronic device 300, which includes an electrical component 301 and a battery pack 200 as described in any of the above embodiments or combinations thereof, wherein the electrical component 301 is electrically connected to the battery pack 200.

[0113] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A battery module, comprising: A battery cell assembly includes a plurality of battery cells; each of the battery cells includes a housing and an electrode assembly housed within the housing, the electrode assembly including tabs; and A first circuit board, wherein the plurality of battery cells are connected to the first circuit board; The feature is that the plurality of battery cells include a first battery cell and a second battery cell, the first battery cell being inclined relative to the second battery cell; the first battery cell includes a first electrode tab, the second battery cell includes a second electrode tab, and the first electrode tab and the second electrode tab are arranged opposite to each other; The first circuit board is disposed between the first battery cell and the second battery cell, and the first circuit board is disposed between the first electrode and the second electrode; the first circuit board is inclined relative to the first battery cell, and the first circuit board is inclined relative to the second battery cell.

2. The battery module as described in claim 1, characterized in that, Along the thickness direction of the battery cell, the housing includes a first main plane and a second main plane disposed opposite to each other. Along the length direction of the battery cell, one end of the housing is provided with a sealing edge, and the electrode extends out of the housing from the sealing edge. The housing further includes a first surface connecting the sealing edge and the first main plane, and a second surface connecting the sealing edge and the second main plane, wherein the width of the first surface is greater than the width of the second surface along the thickness direction; One end of the first circuit board is inclined near the first surface of the first battery cell, and the other end of the first circuit board is inclined near the first surface of the second battery cell.

3. The battery module as described in claim 1, characterized in that, The first electrode tab includes a first welding portion, and the second electrode tab includes a second welding portion; The battery module includes: The first connecting piece includes a first fixing part and a first connecting part. The first fixing part is soldered to the first circuit board, and the first connecting part is soldered to the first soldering part. The first soldering part is disposed between the first fixing part and the first connecting part. The second connecting piece includes a second fixing part and a second connecting part. The second fixing part is soldered to the first circuit board, and the second connecting part is soldered to the second welding part. The second welding part is disposed between the second fixing part and the second connecting part.

4. The battery module as described in claim 3, characterized in that, The first fixing part and the first connecting part clamp the first welding part, one surface of the first welding part is in contact with the first connecting part, and the other surface of the first welding part is in contact with the first fixing part. The second fixing part and the second connecting part clamp the second welding part, one surface of the second welding part is in contact with the second connecting part, and the other surface of the second welding part is in contact with the second fixing part.

5. The battery module as described in claim 3, characterized in that, The first welding part is disposed between the first surface of the first battery cell and the first circuit board, and the second welding part is disposed between the second surface of the second battery cell and the first circuit board.

6. The battery module as described in claim 3, characterized in that, The first circuit board includes a first side and a second side disposed opposite to each other, the first electrode tab is disposed on the first side, and the second electrode tab is disposed on the second side.

7. The battery module as described in claim 2, characterized in that, The first circuit board and the sealing edge of the first battery cell form an acute angle, the acute angle being 30-60°.

8. The battery module as described in claim 2, characterized in that, The battery module further includes a first insulating component and a second insulating component, wherein the first insulating component covers at least a portion of the sealing edge of the first battery cell, and the second insulating component covers at least a portion of the sealing edge of the second battery cell.

9. The battery module as described in claim 8, characterized in that, The first insulating member has a first opening, and the first electrode extends out from the first opening; the second insulating member has a second opening, and the second electrode extends out from the second opening.

10. A battery pack, characterized in that, It includes a housing and a battery module as described in any one of claims 1-9, wherein the battery module is housed in the housing.

11. The battery pack as claimed in claim 10, characterized in that, The battery pack also includes a second circuit board, one end of which is connected to the first circuit board of the battery module, and the other end of which extends out of the housing.

12. The battery pack as claimed in claim 11, characterized in that, The outer casing includes an arc-shaped base plate, and the inner sidewall of the arc-shaped base plate is provided with a first groove and a second groove. The battery pack also includes a first separator and a second separator. The first separator is disposed between the first cell of the battery module and the first groove, and the second separator is disposed between the second cell of the battery module and the second groove.

13. The battery pack as claimed in claim 12, characterized in that, The first spacer covers the first groove, and the second spacer covers the second groove.

14. The battery pack as claimed in claim 12, characterized in that, The radius of the arc of the arc-shaped base plate is 85-110mm.

15. The battery pack as claimed in claim 12, characterized in that, The outer casing also includes a side plate and an arc-shaped cover plate. The side plate is arranged around the arc-shaped base plate, and the arc-shaped cover plate is fixedly connected to the side plate. The arc radius of the arc-shaped cover plate is 80-100mm.

16. The battery pack as claimed in claim 10, characterized in that, The battery pack also includes a fixing component, which includes a first bracket, a second bracket, and a connecting portion. The first bracket and the second bracket are respectively disposed on opposite sides of the connecting portion. The first battery cell of the battery module is disposed on the first bracket, the second battery cell is disposed on the second bracket, and the first circuit board is disposed on the connecting portion.

17. The battery pack as claimed in claim 10, characterized in that, The housing contains resin to fill the gap between the housing and the battery cell assembly of the battery module.

18. The battery pack as claimed in claim 17, characterized in that, The housing is provided with an injection hole, and the resin is filled into the housing by low-pressure injection molding.

19. An electronic device, characterized in that, The electronic device includes an electrical component and a battery pack as described in any one of claims 10-18, wherein the electrical component is electrically connected to the battery pack.

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