Battery and terminal device

Abstract

The invention discloses a battery and a terminal device. The battery comprises a battery cell and a circuit board assembly. The battery cell comprises an electrode assembly, a packaging bag and two tabs. The packaging bag comprises a main body part and a packaging part, and the electrode assembly is arranged in the main body part. The main body part comprises a top wall, the packaging part comprises a top sealing part, and the top sealing part is connected with the top wall. The top sealing part comprises a bent part, and the bent part and the top wall are arranged in the second direction when observed in the first direction. And the tabs extend out from the bending parts. The thickness direction of the battery cell is the first direction. The circuit board assembly comprises a substrate and a first circuit board electrically connected with the substrate. Observed along the first direction, the substrate and the bending part are arranged along the second direction, and the two tabs are arranged along the third direction and are electrically connected with the substrate. The first circuit board comprises a first part and a first connector, the first part extends in the direction away from the top wall when observed in the first direction, the first connector is arranged on the first part, the substrate is overlapped with the two tabs when observed in the second direction, and the first part is not overlapped with the substrate. The battery can improve the energy density.

Description

Technical Field

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

[0002] The protection board assembly located at the head of the battery usually includes a substrate and a flexible circuit board connected to the substrate. In the existing protection board assembly, the flexible circuit board usually extends to the side of the substrate away from the battery cell, which causes the flexible circuit board to occupy a larger space at the head of the battery, thereby reducing the energy density of the battery. Summary of the invention

[0003] In view of the above situation, the present application provides a battery that is beneficial to improving energy density.

[0004] An embodiment of the present application provides a battery, the battery comprising a cell and a circuit board assembly. The cell comprises an electrode assembly, a packaging bag and two tabs. The packaging bag comprises a main body and a packaging part, and the electrode assembly is arranged in the main body. The main body comprises a top wall, and the packaging part comprises a top seal part, and the top seal part is connected to the top wall. The top seal part comprises a bending part, and the bending part and the top wall are arranged along the second direction when viewed in the first direction. The tab extends from the bending part. The thickness direction of the cell is the first direction. The circuit board assembly comprises a substrate and a first circuit board electrically connected to the substrate. When viewed in the first direction, the substrate and the bending part are arranged along the second direction, and the two tabs are arranged along the third direction and are electrically connected to the substrate. The first direction, the second direction and the third direction are perpendicular to each other. The first circuit board comprises a first part and a first connector, and when viewed in the first direction, the first part extends in a direction away from the top wall, and the first connector is arranged in the first part, and when viewed in the second direction, the substrate overlaps with the two tabs, and the first part does not overlap with the substrate.

[0005] In the above-mentioned battery, the first circuit board includes a first part and a first connector. When viewed along the first direction, the first part extends in a direction away from the top wall. When viewed along the second direction, the substrate overlaps with the two pole ears, and the first part does not overlap with the substrate, so as to reduce the space waste in the second direction caused by the overlap of the first part and the substrate, which is beneficial to improving the energy density of the battery.

[0006] In some embodiments of the present application, the first circuit board includes a second portion, the second portion is connected to the substrate and the first portion. The second portion and the bending portion are arranged along the second direction, and the first portion extends from the second portion in a direction away from the top wall. The second portion can provide a margin of movement for the first portion to facilitate the connection of the first connector with an external circuit.

[0007] In some embodiments of the present application, the circuit board assembly includes a first protection device, and the first protection device is configured to form a protection circuit for protecting the battery cell. The first protection device is connected to the first portion, and when viewed along the second direction, the first protection device does not overlap with the substrate, so as to reduce the space waste in the second direction caused by the overlap of the first protection device and the substrate, and when the first connector extends into the mainboard compartment of the terminal device and connects with the mainboard of the terminal device, the first protection device can utilize the space in the mainboard compartment of the terminal device, which is conducive to improving the energy density of the battery.

[0008] In some embodiments of the present application, the circuit board assembly includes a second protection device, which is configured to form a protection circuit for protecting the battery cell. The second protection device is connected to the second portion, and when viewed along the second direction, the second protection device does not overlap with the substrate to improve space utilization of the battery head.

[0009] In some embodiments of the present application, the circuit board assembly includes a second protection device, and the second protection device is configured to form a protection circuit for protecting the battery cell. The second protection device is connected to the second portion, and when viewed along the third direction, the second protection device overlaps with the substrate, so that the second protection device and the substrate share space in the second direction, which is beneficial to improving the energy density of the battery.

[0010] In some embodiments of the present application, the second portion includes a first section, a second section, and a third section. The first section is connected to the substrate, and the first section is arranged along the second direction with the bending portion. The third section is arranged along the second direction with the first section, and the third section is located on a side of the first section away from the bending portion along the second direction. The second section is connected between the first section and the third section and extends along the second direction, and the second section can provide a margin of movement between the first section and the third section. The first portion extends from the third section in a direction away from the top wall, so that the first connector provided on the first portion is connected to an external circuit.

[0011] In some embodiments of the present application, along the second direction, the second protection device is located between the first segment and the third segment.

[0012] In some embodiments of the present application, when viewed along the third direction, the second protection device overlaps with the substrate, so that the second protection device and the substrate share the space in the second direction, which is beneficial to improving the energy density of the battery.

[0013] In some embodiments of the present application, along the second direction, the second protection device is located between the first section and the bending portion.

[0014] In some embodiments of the present application, along the second direction, the second protection device is located on a surface of the third segment away from the first segment.

[0015] In some embodiments of the present application, when viewed along the first direction, the first section overlaps with the second protection device, so that the second protection device and the first section share the space in the second direction, which is beneficial to improving the energy density of the battery.

[0016] In some embodiments of the present application, the bending portion includes a first body portion and a first recessed portion, the first body portion and the substrate are arranged along the second direction, the tab extends from the first body portion and is connected to the substrate, and when viewed along the second direction, at least a portion of the second portion overlaps with the first recessed portion. When connected to an external circuit, at least a portion of the second portion can be embedded in the accommodation space formed by the first recessed portion, which, on the one hand, can facilitate the first connector to extend into the mainboard compartment of the terminal device and connect to the mainboard of the terminal device; on the other hand, it is beneficial to improve the energy density of the battery.

[0017] In some embodiments of the present application, the circuit board assembly includes a second protection device connected to the second portion, and at least a portion of the second portion and / or the second protection device is disposed in an accommodating space formed by the first recess.

[0018] In some embodiments of the present application, along the second direction, the distance between the first body portion and the top wall is D1, the distance between the first recessed portion and the top wall is D2, and 0mm<D1-D2≤0.3mm.

[0019] In some embodiments of the present application, when viewed along the third direction, the second portion overlaps with the first main body portion, and the second portion includes a fourth section, a fifth section, a sixth section, and a seventh section. The fourth section is connected between the substrate and the fifth section. The fifth section is arranged along the second direction with the first recess. When viewed along the first direction, the fourth section is tilted relative to the fifth section along the second direction, the seventh section is arranged along the second direction with the fifth section and is located on the side of the fifth section away from the first recess, the sixth section is connected between the fifth section and the seventh section and extends along the second direction, and the sixth section can provide a margin of movement between the fifth section and the seventh section. The first portion extends from the seventh section in a direction away from the top wall to facilitate the connection of the first connector provided on the first portion with the external circuit.

[0020] In some embodiments of the present application, the circuit board assembly includes a second protection device; along the second direction, the second protection device is located between the fifth segment and the seventh segment, and when viewed along the third direction, the second protection device overlaps with the tab. Along the third direction, the second protection device overlaps with the tab, so that the second protection device and the tab share the space in the second direction, which is beneficial to improving the energy density of the battery.

[0021] In some embodiments of the present application, along the second direction, the second protection device is located on the surface of the fifth section facing the first recess, and at least a portion of the second protection device is disposed in the accommodating space formed by the first recess, so that the second protection device and the bending portion share the space in the second direction, which is beneficial to improving the energy density of the battery.

[0022] In some embodiments of the present application, along the second direction, the second protection device is located on the surface of the seventh segment away from the fifth segment, and when viewed along the third direction, the second protection device overlaps with the substrate, so that the second protection device and the substrate share the space in the second direction, which is beneficial to improving the energy density of the battery.

[0023] In some embodiments of the present application, the fifth section abuts against the first recess to further improve the energy density of the battery.

[0024] In some embodiments of the present application, the circuit board assembly includes a third circuit board. The third circuit board includes a third portion and a second connector disposed on the third portion. The second connector cooperates with the first connector to improve the current carrying capacity of the circuit board assembly. When viewed along the first direction, the third portion extends in a direction away from the top wall. When viewed along the second direction, the third portion does not overlap with the substrate, and the third portion and the first portion are disposed on both sides of the substrate along the third direction to reduce the space waste caused by the overlap of the third portion with the substrate in the second direction, which is beneficial to improving the energy density of the battery.

[0025] In some embodiments of the present application, the substrate includes two sub-substrates, and when viewed along the second direction, the two sub-substrates are spaced apart along the third direction, and the two sub-substrates overlap with a tab respectively. Along the third direction, the first portion is disposed between the two sub-substrates to reduce the space waste in the second direction caused by the overlap of the first portion with the substrate, which is beneficial to improving the energy density of the battery.

[0026] In some embodiments of the present application, the first circuit board includes a fourth portion, the fourth portion and the bending portion are arranged along the second direction, the fourth portion is connected between the two sub-substrates, and the first portion extends from the fourth portion in a direction away from the top wall. The fourth portion can provide a margin of movement for the first portion to facilitate the connection of the first connector with an external circuit.

[0027] In some embodiments of the present application, the first circuit board includes a fifth portion and a third connector. When viewed along the first direction, the fifth portion extends from the fourth portion in a direction away from the top wall. The fifth portion and the first portion are spaced apart along the third direction, and the third connector is disposed at the fifth portion. The third connector cooperates with the first connector to improve the current carrying capacity of the circuit board assembly.

[0028] In some embodiments of the present application, the circuit board assembly includes a fifth protection device, which is connected to the fourth portion. When viewed along the third direction, the fifth protection device overlaps with the sub-base, so that the fifth protection device and the base share space in the second direction, which is beneficial to improving the energy density of the battery.

[0029] In some embodiments of the present application, the fourth portion is recessed toward the bent portion to fully utilize the space between the two sub-substrates and further improve the energy density of the battery.

[0030] In some embodiments of the present application, the bending portion includes two second body portions and a second recessed portion, a sub-base plate is arranged opposite to a second body portion, a tab extends from a second body portion and is connected to a sub-base plate, and when viewed along the second direction, at least a portion of the fourth portion overlaps with the second recessed portion. When connected to an external circuit, at least a portion of the fourth portion can be embedded in the accommodation space formed by the second recessed portion, which, on the one hand, can facilitate the first connector and the third connector to extend into the mainboard compartment of the terminal device and connect to the mainboard of the terminal device; on the other hand, it is conducive to improving the energy density of the battery.

[0031] In some embodiments of the present application, at least a portion of the fourth portion is disposed in the accommodating space formed by the second recess.

[0032] In some embodiments of the present application, along the second direction, the distance between the second body portion and the top wall is D3, the distance between the second recessed portion and the top wall is D4, and 0mm<D3-D4≤0.3mm.

[0033] In some embodiments of the present application, when viewed along the third direction, the fourth portion overlaps with the second main body portion, and the fourth portion includes two eighth segments and a ninth segment connected between the two eighth segments. An eighth segment is connected to a sub-base at one end away from the ninth segment. When viewed along the first direction, the eighth segment is tilted relative to the ninth segment along the second direction, and the first portion extends from the ninth segment in a direction away from the top wall.

[0034] In some embodiments of the present application, the circuit board assembly includes a fifth protection device, which is connected to the ninth segment. The fifth protection device is located between two eighth segments. When viewed along the third direction, the fifth protection device overlaps with the pole ear so that the fifth protection device and the pole ear share the space in the second direction, which is beneficial to improving the energy density of the battery.

[0035] In some embodiments of the present application, the ninth section abuts against the second recess to further improve the energy density of the battery.

[0036] In some embodiments of the present application, the substrate includes a connecting plate, which connects two sub-substrates, the connecting plate is connected to the fourth part, and the connecting plate and the fourth part are arranged along the second direction, and the connecting plate and the first part are arranged along the first direction, so that the connecting plate and the first part share the space in the second direction, which is beneficial to improving the energy density of the battery.

[0037] In some embodiments of the present application, a first notch is provided on the edge of the fourth part along the first direction, the first notch has a first edge extending along the third direction, one end of the first part is located in the first notch and connected to the first edge, so that the first connector and the first protection device on the first part share the space in the first direction with the fourth part, which is beneficial to improving the energy density of the battery.

[0038] An embodiment of the present application further provides a terminal device, which includes any one of the batteries in the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the structure of a battery in one embodiment of the present application.

[0040] Figure 2 yes Figure 1 Schematic diagram of the back structure of the battery.

[0041] Figure 3 yes Figure 1 Partial cross-sectional view of the battery along section line AA.

[0042] Figure 4 It is a schematic diagram of the structure of a battery in another embodiment of the present application.

[0043] Figure 5 This is a schematic diagram of the first position of a second protection device of a battery in an embodiment of the present application.

[0044] Figure 6 This is a schematic diagram of the second position of the second protection device of the battery in one embodiment of the present application.

[0045] Figure 7 This is a schematic diagram of the third position of the second protection device of the battery in one embodiment of the present application.

[0046] Figure 8 It is a schematic diagram of the first structure of the second bent portion of the battery in one embodiment of the present application.

[0047] Fig. 9 It is a schematic diagram of the second structure of the second bend of the battery in one embodiment of the present application.

[0048] Fig.10 It is a third structural schematic diagram of the second bent portion of the battery in one embodiment of the present application.

[0049] Fig.11 This is a schematic diagram of the first position of the sixth protection device of the battery in one embodiment of the present application.

[0050] Fig.12 yes Fig.11 Schematic diagram of the back structure of the battery.

[0051] Fig.13 It is a schematic diagram of the second position structure of the sixth protection device of the battery in one embodiment of the present application.

[0052] Fig.14 It is a schematic diagram of the third position structure of the sixth protection device of the battery in one embodiment of the present application.

[0053] Fig.15 It is a first structural schematic diagram of a bent connecting portion of a battery in an embodiment of the present application.

[0054] Fig.16 yes Fig.15 Schematic diagram of the back structure of the battery.

[0055] Fig.17 It is a second structural schematic diagram of a bent connecting portion of a battery in an embodiment of the present application.

[0056] Fig.18 It is a third structural schematic diagram of a battery connecting portion being bent in one embodiment of the present application.

[0057] Fig.19 It is a schematic diagram of the first structure of the second part and the connecting part of the battery in one embodiment of the present application.

[0058] Fig. 20 1 is a second structural schematic diagram of the second part and the connecting part of the battery in one embodiment of the present application.

[0059] Fig.21 yes Fig. 20 Schematic diagram of the back structure of the battery.

[0060] Fig. 22 It is a schematic diagram of the structure of the first circuit board of a battery in one embodiment of the present application.

[0061] Fig.23 yes Fig. 22 Schematic diagram of the back structure of the battery.

[0062] Fig.24 It is a schematic structural diagram of a fifth protection device of a battery in an embodiment of the present application.

[0063] Fig.25 It is a schematic structural diagram of the fourth bend of the battery in one embodiment of the present application.

[0064] Fig.26 It is a schematic diagram of the structure of a connecting plate of a battery in one embodiment of the present application.

[0065] Fig. 27 It is a schematic diagram of the structure of a terminal device in another embodiment of the present application.

[0066] Main component symbols Battery 100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J, 100K Terminal device 200 Battery 10 Electrode assembly 11 Packaging bag 12 Main body 12A Top wall 121 First side wall 122 Packaging part 12B Top seal 125 Bending portion 125A First body part 1251 first recess 1252 Second body part 1253 Second recess 1254 Third recess 1255 Top seal extension 125B Side seal 126 Side seal extension 126A Lobe 127 Tab 13 Circuit board assembly 20 Substrate 21 Sub-base 21A The second circuit board 211 Reinforcement plate 212 Connector 213 First connecting section 213A Second connecting section 213B Connecting plate 214 First circuit board 22 Part 1221 First area 221A Second area 221B First connector 222 Part 223 Section 123A Section 223B Section 3 223C Section 4 223D Section 5, 223E Section 6, 223F Section 7 223G Part 4 224 First gap 224A First Edge 2241 Second gap 224B Second Edge 2242 Section 8, 224C Section 9, 224D Part 5 225 The third connector 226 The first protection device 23 The second protection device 24 The third circuit board 25 Part 3 251 Second connector 252 Connection part 253 First extension section 253A The second extension section 253B The third extension section 253C Fourth extension section 253D Fifth extension section 253E Sixth extension section 253F Seventh extension 253G The third protection device 26 Fourth protection device 27 Fifth protection device 28 Sixth protection device 29 Housing 91 Battery compartment 911 Mainboard compartment 912 Motherboard 92 First direction X The second direction Z The third direction Y The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0067] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0068] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centrally arranged element at the same time. When an element is considered to be "set" on another element, it may be directly set on the other element or there may be a centrally arranged element at the same time. It should be understood that, considering the factors of actual processing tolerance, in the technical solution of the present application, when two elements are set parallel / vertically and in the same direction, there may be a certain angle between the two elements, and the angle between the two elements is allowed to have a tolerance of 0-±10%.

[0069] When a value is considered to be "equal" to another value, it means that the two are equal within the set deviation, and the set deviation range is within 10%. In other words, when at least one of the two values ​​fluctuates within the set deviation range, even if their values ​​are not equal, they are still judged to be roughly equal. When a value is considered to be in a "1:1" ratio with another value, it means that the two are equal within the set deviation, and the set deviation range is within 10%. In other words, when at least one of the two values ​​fluctuates within the set deviation range, even if their values ​​are not equal, they are still judged to be equal in ratio.

[0070] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items. The term "overlap" used herein refers to the overlap of the projections of two parts or the overlap of the projections of two parts.

[0071] One embodiment of the present application provides a battery, the battery comprising a cell and a circuit board assembly. The cell comprises an electrode assembly, a packaging bag and two tabs. The packaging bag comprises a main body and a packaging part, and the electrode assembly is arranged in the main body. The main body comprises a top wall, and the packaging part comprises a top seal part, and the top seal part is connected to the top wall. The top seal part comprises a bending part, and the bending part and the top wall are arranged along the second direction when viewed in the first direction. The tab extends from the bending part. The thickness direction of the cell is the first direction. The circuit board assembly comprises a substrate and a first circuit board electrically connected to the substrate. When viewed in the first direction, the substrate and the bending part are arranged along the second direction, and the two tabs are arranged along the third direction and are electrically connected to the substrate. The first direction, the second direction and the third direction are perpendicular to each other. The first circuit board comprises a first part and a first connector, and when viewed in the first direction, the first part extends in a direction away from the top wall, and the first connector is arranged in the first part, and when viewed in the second direction, the substrate overlaps with the two tabs, and the first part does not overlap with the substrate.

[0072] In the above-mentioned battery, the first circuit board includes a first part and a first connector. When viewed along the first direction, the first part extends in a direction away from the top wall. When viewed along the second direction, the substrate overlaps with the two pole ears, and the first part does not overlap with the substrate, so as to reduce the space waste in the second direction caused by the overlap of the first part and the substrate, which is beneficial to improving the energy density of the battery.

[0073] The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0074] Example 1 Please also read Figure 1 and Figure 2One embodiment of the present application provides a battery 100A. The battery 100A may be, but is not limited to, a secondary battery. A secondary battery refers to a battery that can be continuously used by activating active materials by charging after the battery is discharged.

[0075] The battery 100A includes a battery cell 10 and a circuit board assembly 20. The thickness direction of the battery cell 10 is a first direction X, the length direction of the battery cell 10 is a second direction Z, and the width direction of the battery cell 10 is a third direction Y. The first direction X, the second direction Z and the third direction Y are perpendicular to each other.

[0076] The battery cell 10 includes an electrode assembly 11, a packaging bag 12 and two tabs 13. The electrode assembly 11 is used to convert chemical energy into electrical energy. The packaging bag 12 is made of a packaging film by punching, folding and heat sealing. The packaging bag 12 includes a main body 12A and a packaging part 12B, wherein the main body 12A is a part where the punching is provided, and the packaging part 12B is a part where the packaging film overlaps and is joined.

[0077] The electrode assembly 11 is disposed in the main body 12A. The main body 12A includes a top wall 121, and the packaging part 12B includes a top seal 125, which is connected to the top wall 121. The top seal 125 includes a bending portion 125A, and when viewed along the first direction X, the bending portion 125A and the top wall 121 are arranged along the second direction Z. The top seal 125 is bent to reduce the space occupied by the top seal 125 in the second direction Z, which is conducive to improving the energy density of the battery 100A.

[0078] Two tabs 13 extend from the bent portion 125A, and the two tabs 13 have different polarities, so as to form a complete current loop with the circuit board assembly 20 .

[0079] The circuit board assembly 20 includes a substrate 21 and a first circuit board 22 electrically connected to the substrate 21. Viewed along the first direction X, the substrate 21 and the bending portion 125A are arranged along the second direction Z, and the two tabs 13 are arranged along the third direction Y and electrically connected to the substrate 21.

[0080] The first circuit board 22 includes a first portion 221 and a first connector 222. When viewed along the first direction X, the first portion 221 extends in a direction away from the top wall 121. The first connector 222 is disposed on the first portion 221 and is configured to be connected to an external circuit. The external circuit may be, but is not limited to, a mainboard of a terminal device powered by the battery 100A.

[0081] Observing along the second direction Z, the substrate 21 overlaps with the two tabs 13 , and the first portion 221 does not overlap with the substrate 21 , so as to reduce the space waste in the second direction Z caused by the overlap of the first portion 221 with the substrate 21 , which is beneficial to improving the energy density of the battery 100A.

[0082] In some embodiments, when viewed along the first direction X, the first portion 221 extends along the second direction Z in a direction away from the top wall 121 .

[0083] Please also read Figure 1 and Figure 2 In some embodiments, the main body 12A includes two first side walls 122 connected to both sides of the top wall 121 along the third direction Y, and the packaging portion 12B includes two side sealing portions 126, one side sealing portion 126 is connected to one first side wall 122. The side sealing portion 126 is bent toward the first side wall 122, and the side sealing portion 126 includes a side sealing extension portion 126A protruding from the top wall 121 along the second direction Z.

[0084] Along the third direction Y, the top seal portion 125 further includes two top seal extensions 125B, the two top seal extensions 125B are connected to the two ends of the bending portion 125A along the third direction Y, and the two top seal extensions 125B protrude from the bending portion 125A along the second direction Z. A side seal extension 126A is connected to a top seal extension 125B to form a convex corner portion 127. When viewed along the second direction Z, the circuit board assembly 20 is located between the two convex corner portions 127 in the third direction Y, so that the circuit board assembly 20 and the convex corner portion 127 share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100A.

[0085] In some embodiments, the first circuit board 22 is a flexible printed circuit (FPC), which is a printed circuit made of a flexible insulating substrate.

[0086] Please also read Figure 1 and Figure 2 In some embodiments, the first circuit board 22 includes a second portion 223, the second portion 223 is connected to the substrate 21 and the first portion 221, the second portion 223 and the bending portion 125A are arranged along the second direction Z, and the first portion 221 extends from the second portion 223 in a direction away from the top wall 121. The second portion 223 can provide a margin of movement for the first portion 221, so that the first connector 222 can be connected to an external circuit.

[0087] In some embodiments, the second portion 223 includes a first section 223A, a second section 223B, and a third section 223C. The first section 223A is connected to the substrate 21, the first section 223A and the bending portion 125A are arranged along the second direction Z, the third section 223C and the first section 223A are arranged along the second direction Z, and the third section 223C is located on the side of the first section 223A away from the bending portion 125A along the second direction Z. The second section 223B is connected between the first section 223A and the third section 223C and extends along the second direction Z, and the second section 223B can provide a margin of movement between the first section 223A and the third section 223C. The first portion 221 extends from the third section 223C in a direction away from the top wall 121, so that the first connector 222 provided on the first portion 221 can be connected to an external circuit.

[0088] In some embodiments, when viewed along the first direction X, the corner between the first segment 223A and the second segment 223B extends in an arc, and the corner between the second segment 223B and the third segment 223C extends in an arc, so as to reduce the risk of stress concentration at the corner of the second portion 223 .

[0089] Please also read Figure 1 and Figure 2 In some embodiments, the circuit board assembly 20 includes a first protection device 23, the first protection device 23 is connected to the first portion 221, and the first protection device 23 is configured to form a protection circuit for protecting the battery cell 10. When viewed along the second direction Z, the first protection device 23 does not overlap with the substrate 21, so as to reduce the space waste in the second direction Z caused by the overlap of the first protection device 23 and the substrate 21, and when the first connector 222 extends into the mainboard compartment of the terminal device and connects with the mainboard of the terminal device, the first protection device 23 can use the space in the mainboard compartment of the terminal device, which is beneficial to improve the energy density of the battery 100D.

[0090] In some embodiments, the size of the first protection device 23 is smaller than that of the first part 221 , the first part 221 includes a first area 221A and a second area 221B surrounding the first area 221A, and the first protection device 23 overlaps with the first area 221A to improve the stability of the connection between the first protection device 23 and the first part 221 .

[0091] In some embodiments, the first protective device 23 and the first connector 222 are respectively located on both sides of the first part 221 in the thickness direction. The first protective device 23 can support the first part 221 and reduce the risk of damage to the first part 221 due to force during the connection between the first connector 222 and the external circuit.

[0092] It can be understood that, in some embodiments, the first protection device 23 and the first connector 222 are located on the same surface of the first portion 221 , and the first connector 222 is located at an end of the first protection device 23 away from the top wall 121 .

[0093] In some embodiments, the configuration of the first protection device 23 needs to be selected according to the control logic design of the protection circuit. The first protection device 23 includes: a current sensing resistor, a resistor for detecting battery temperature, a transistor for controlling the disconnection of the battery charge / discharge circuit, a transient suppression diode for port surge protection, a protection chip for realizing battery overvoltage, undervoltage, overcurrent fault detection, an encryption chip, an ID resistor, and at least one of components integrating IC and MOS functions.

[0094] In some embodiments, the first protection device 23 is a SIP module formed by a SIP packaging process, wherein the SIP packaging process refers to a packaging method that integrates multiple functional chips (including processors, memories, etc.) into one package to achieve a basically complete function.

[0095] It can be understood that, in some embodiments, the first protection device 23 includes an electronic device and an injection molded body, the electronic device is directly welded to the first part 221, and the injection molded body is connected to the first part 221 and covers the electronic device to protect the electronic device.

[0096] Please also read Figure 1 and Figure 2 In some embodiments, the substrate 21 includes a second circuit board 211 and a reinforcing plate 212 connected to the second circuit board 211 , and the reinforcing plate 212 and the bending portion 125A are respectively located on two opposite sides of the second circuit board 211 .

[0097] In some embodiments, the second circuit board 211 is a flexible circuit board, and the second circuit board 211 and the first circuit board 22 are integrally configured to improve the structural stability of the circuit board assembly 20 .

[0098] It is understandable that, in some embodiments, the substrate 21 may be a printed circuit board (PCB) or a rigid-flex board.

[0099] Please also read Figure 1 and Figure 3 In some embodiments, the substrate 21 includes two connectors 213 , both of which are connected to one side of the second circuit board 211 facing the bending portion 125A, and one connector 213 is connected to one pole ear 13 to improve the stability of the connection between the pole ear 13 and the substrate 21 .

[0100] In some embodiments, the connector 213 is a "U"-shaped connector, and the connector 213 includes two first connector segments 213A spaced apart along the second direction Z and a second connector segment 213B connected to the two first connector segments 213A. One of the first connector segments 213A is connected to the second circuit board 211, and an opening is formed at one end of the two first connector segments 213A away from the second connector segment 213B. The tab 13 extends into the opening and is connected to the other first connector segment 213A, so as to improve the stability of the connection between the connector 213 and the tab 13.

[0101] It can be understood that, in some embodiments, the connecting member 213 is an “L”-shaped connecting piece, that is, the corresponding connecting piece can also achieve the above-mentioned electrical connection relationship by bending once.

[0102] It is understandable that, in some embodiments, the connecting member 213 is a flat nickel block.

[0103] See also Figure 4 In some embodiments, the third direction Y includes the third direction Y and a direction opposite to the third direction Y. The substrate 21 and the second portion 223 are arranged in a direction opposite to the third direction Y.

[0104] Example 2 See also Figure 5 One embodiment of the present application further provides a battery 100B. The difference between the battery 100B and the battery 100A is that the circuit board assembly 20 includes a second protection device 24.

[0105] The second protection device 24 is connected to the second portion 223 and is configured to form a protection circuit for protecting the battery cell 10. When viewed along the second direction Z, the second protection device 24 does not overlap with the substrate 21 to improve space utilization of the head of the battery 100B.

[0106] In some embodiments, the second protection device 24 is a SIP module.

[0107] It can be understood that in some embodiments, the second protection device 24 includes an electronic device and an injection molded body, the electronic device is directly welded to the second part 223, and the injection molded body covers the electronic device and the portion of the second part 223 where the electronic device is provided to protect the electronic device.

[0108] In some embodiments, a first protection device 23 and a second protection device 24 are defined respectively according to the size of the electronic device. An electronic device with a height greater than a preset threshold is provided in the first part 221 as the first protection device 23, and an electronic device with a height less than or equal to the preset threshold is provided in the second part 223 as the second protection device 24. For example, the preset threshold is measured in the following manner: measuring a first spacing value between the surface of the end of the substrate 21 close to the first part 221 away from the bending portion 125A and the bending portion 125A along the second direction Z, measuring a first thickness value of the first segment 223A, and measuring a second thickness value of the third segment 223C. The preset threshold is the first spacing value minus the difference between the first thickness value and the second thickness value in sequence, so as to reduce the space waste caused by the large space occupied by the electronic device in the second direction Z while meeting the protection circuit requirements, which is beneficial to improving the energy density of the battery 100B.

[0109] See also Figure 5 In some embodiments, along the second direction Z, the second protection device 24 is located between the first segment 223A and the third segment 223C, and the second protection device 24 is connected to the surface of the first segment 223A facing the third segment 223C or the surface of the third segment 223C facing the first segment 223A. When viewed along the third direction Y, the second protection device 24 overlaps with the substrate 21, so that the second protection device 24 and the substrate 21 share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100B.

[0110] See also Figure 6 In some embodiments, along the second direction Z, the second protection device 24 is located between the first segment 223A and the bending portion 125A, and the second protection device 24 is connected to the surface of the first segment 223A facing the bending portion 125A.

[0111] See also Figure 7 In some embodiments, the second protection device 24 is located on the surface of the third segment 223C away from the first segment 223A. When viewed along the first direction X, the first portion 221 overlaps with the second protection device 24, so that the second protection device 24 and the first portion 221 share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100B.

[0112] Except for the above differences, the parameters of the battery 100B and the battery 100A are substantially the same, and reference may be made to the description of the battery 100A above.

[0113] Example 3 See also Figure 8 One embodiment of the present application further provides a battery 100C. The difference between the battery 100C and the battery 100B lies in the different structure of the bent portion 125A.

[0114] The bending portion 125A includes a first body portion 1251 and a first recessed portion 1252. Along the second direction Z, the distance between the first body portion 1251 and the top wall 121 is greater than the distance between the first recessed portion 1252 and the top wall 121. The first recessed portion 1252 forms an accommodation space. The first body portion 1251 and the substrate 21 are arranged along the second direction Z, and the first recessed portion 1252 and the second portion 223 are arranged along the second direction Z. The tab 13 extends from the first body portion 1251 and is connected to a side of the substrate 21 facing the first body portion 1251.

[0115] In some embodiments, when viewed along the second direction Z, at least a portion of the second portion 223 overlaps with the first recess 1252. When connected to an external circuit, at least a portion of the second portion 223 can be embedded in the accommodation space formed by the first recess 1252. On the one hand, it is convenient for the first connector 222 to extend into the mainboard compartment of the terminal device and connect to the mainboard of the terminal device; on the other hand, it is beneficial to improve the energy density of the battery 100C.

[0116] In some embodiments, at least a portion of the second portion 223 is disposed in the accommodating space formed by the first recess 1252, and when observed along the third direction Y, at least a portion of the second portion 223 overlaps with the first main body portion 1251, so that the second portion 223 and the first main body portion 1251 share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100C.

[0117] In some embodiments, at least a portion of the second protection device 24 is disposed in the accommodating space formed by the first recess 1252, and when observed along the third direction Y, the second protection device 24 overlaps with the first main body portion 1251 and / or the pole tab 13, so that the second protection device 24 and the first main body portion 1251 and / or the pole tab 13 share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100C.

[0118] See also Figure 8 In some embodiments, along the second direction Z, the distance between the first main body portion 1251 and the top wall 121 is D1, the distance between the first recess 1252 and the top wall 121 is D2, 0mm<D1-D2≤0.3mm, so as to reduce the risk of excessive depression of the first recess 1252 and interference with the top wall 121.

[0119] Optionally, D1-D2 is one of 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm and any other value in the range of 0 mm<D1-D2≤0.3 mm.

[0120] It should be noted that D1 is measured in the following manner: 3 measuring points are selected on the surface of the first body portion 1251 facing the top wall 121, the spacing value between each measuring point and the top wall 121 along the second direction Z is measured, and the average value of the 3 spacing values ​​is calculated, and the average value is D1. D2 is measured in the following manner: 3 measuring points are selected on the surface of the first recess 1252 close to the top wall 121, the spacing value between each measuring point and the top wall 121 along the second direction Z is measured, and the average value of the 3 spacing values ​​is calculated, and the average value is D2.

[0121] See also Figure 8 In some embodiments, the second portion 223 includes a fourth segment 223D, a fifth segment 223E, a sixth segment 223F, and a seventh segment 223G. The fourth segment 223D is connected between the substrate 21 and the fifth segment 223E. The fifth segment 223E and the first recess 1252 are arranged along the second direction Z. When viewed along the first direction X, the fourth segment 223D is tilted relative to the fifth segment 223E along the second direction Z so that the second portion 223 can extend into the accommodation space formed by the first recess 1252. The seventh segment 223G is arranged along the second direction Z with the fifth segment 223E and is located on the side of the fifth segment 223E away from the first recess 1252. The sixth segment 223F is connected between the fifth segment 223E and the seventh segment 223G and extends along the second direction Z. The sixth segment 223F can provide a margin of movement between the fifth segment 223E and the seventh segment 223G. The first portion 221 extends from the seventh section 223G in a direction away from the top wall 121 , so that the first connector 222 disposed on the first portion 221 can be connected to an external circuit.

[0122] Furthermore, the fifth section 223E abuts against the first recess 1252 to further improve the energy density of the battery 100C.

[0123] In some embodiments, along the second direction Z, the second protection device 24 is located between the fifth segment 223E and the seventh segment 223G, and the second protection device 24 is connected to the surface of the fifth segment 223E facing the seventh segment 223G or the surface of the seventh segment 223G facing the fifth segment 223E. When viewed along the third direction Y, the second protection device 24 overlaps with the tab 13, so that the second protection device 24 and the tab 13 share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100C.

[0124] See also Fig. 9 In some embodiments, along the second direction Z, the second protection device 24 is located on the surface of the fifth segment 223E facing the first recess 1252, and at least a portion of the second protection device 24 is disposed in the accommodating space formed by the first recess 1252, so that the second protection device 24 and the bending portion 125A share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100C.

[0125] See also Fig.10 In some embodiments, the second protection device 24 is located on the surface of the seventh segment 223G away from the fifth segment 223E. When viewed along the third direction Y, the second protection device 24 overlaps with the substrate 21, so that the second protection device 24 and the substrate 21 share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100C. When viewed along the first direction X, the first portion 221 overlaps with the second protection device 24, so that the second protection device 24 and the first portion 221 share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100C.

[0126] Except for the above differences, the parameters of the battery 100C and the battery 100B are substantially the same, and reference may be made to the description of the battery 100B.

[0127] Example 4 Please also read Fig.11 and Fig.12 One embodiment of the present application further provides a battery 100D. The difference between the battery 100D and the battery 100B is that the circuit board assembly 20 includes a third circuit board 25.

[0128] The third circuit board 25 includes a third portion 251 and a second connector 252. When viewed along the first direction X, the third portion 251 extends in a direction away from the top wall 121. The second connector 252 is disposed on the third portion 251 and is configured to be connected to an external circuit. The second connector 252 cooperates with the first connector 222 to improve the current carrying capacity of the circuit board assembly 20.

[0129] When observed along the second direction Z, the third portion 251 does not overlap with the substrate 21. The third portion 251 and the first portion 221 are arranged on both sides of the substrate 21 along the third direction Y to reduce the space waste in the second direction Z caused by the overlap of the third portion 251 with the substrate 21, which is beneficial to improving the energy density of the battery 100D.

[0130] Please also read Fig.11 and Fig.12 In some embodiments, the third circuit board 25 includes a connecting portion 253, the connecting portion 253 is connected to the substrate 21, the connecting portion 253 and the bending portion 125A are arranged along the second direction Z, and the third portion 251 extends from the connecting portion 253 in a direction away from the top wall 121. The connecting portion 253 can provide a margin of movement for the third portion 251, so that the second connector 252 can be connected to an external circuit.

[0131] In some embodiments, the connecting portion 253 includes a first extension section 253A, a second extension section 253B, and a third extension section 253C. The first extension section 253A is connected to the substrate 21, the first extension section 253A and the bending portion 125A are arranged along the second direction Z, the third extension section 253C and the first extension section 253A are arranged along the second direction Z, and the third extension section 253C is located on the side of the first extension section 253A away from the bending portion 125A. The second extension section 253B is connected between the first extension section 253A and the third extension section 253C and extends along the second direction Z, and the second extension section 253B can provide a margin of movement between the first extension section 253A and the third extension section 253C. The third portion 251 extends from the third extension section 253C in a direction away from the top wall 121, so that the second connector 252 provided on the third portion 251 can be connected to an external circuit.

[0132] In some embodiments, the third circuit board 25 is a flexible circuit board, and the third circuit board 25 , the second circuit board 211 and the first circuit board 22 are integrally arranged to improve the structural stability of the circuit board assembly 20 .

[0133] Please also read Fig.11 and Fig.12 In some embodiments, the circuit board assembly 20 includes a third protection device 26, which is connected to the third portion 251 and is configured to form a protection circuit for protecting the battery cell 10. When viewed along the second direction Z, the third protection device 26 does not overlap with the substrate 21, so as to reduce the space waste in the second direction Z caused by the overlap between the third protection device 26 and the substrate 21, which is beneficial to improve the energy density of the battery 100D.

[0134] In some embodiments, the third protection device 26 is a SIP module.

[0135] It can be understood that in some embodiments, the third protection device 26 includes an electronic device and an injection molded body, the electronic device is directly welded to the third part 251, and the injection molded body covers the electronic device and the portion of the third part 251 where the electronic device is provided to protect the electronic device.

[0136] Please also read Fig.11 and Fig.12 In some embodiments, the circuit board assembly 20 includes a sixth protection device 29, which is connected to the connecting portion 253. When observed along the second direction Z, the sixth protection device 29 does not overlap with the substrate 21, and the sixth protection device 29 is configured to form a protection circuit for protecting the battery cell 10.

[0137] In some embodiments, the sixth protection device 29 is a SIP module.

[0138] It can be understood that in some embodiments, the sixth protection device 29 includes an electronic device and an injection molded body, the electronic device is directly welded to the connecting portion 253, and the injection molded body covers the electronic device and the portion of the connecting portion 253 where the electronic device is provided to protect the electronic device.

[0139] See also Fig.11 In some embodiments, along the second direction Z, the sixth protection device 29 is located between the first extension segment 253A and the third extension segment 253C, and the sixth protection device 29 is connected to the surface of the first extension segment 253A facing the second extension segment 253B or the surface of the second extension segment 253B facing the first extension segment 253A. And when viewed along the third direction Y, the sixth protection device 29 overlaps with the substrate 21, so that the sixth protection device 29 and the substrate 21 share the space in the second direction Z, which is beneficial to improve the energy density of the battery 100D.

[0140] See also Fig.13 In some embodiments, along the second direction Z, the sixth protection device 29 is located between the first extension segment 253A and the bending portion 125A, and the sixth protection device 29 is connected to the surface of the first extension segment 253A facing the bending portion 125A.

[0141] See also Fig.14 In some embodiments, the sixth protection device 29 is located on the surface of the third extension section 253C away from the first extension section 253A. When viewed along the third direction Y, the sixth protection device 29 overlaps with the substrate 21, so that the sixth protection device 29 and the substrate 21 share the space in the second direction Z, which is beneficial to improve the energy density of the battery 100D. When viewed along the first direction X, the third portion 251 overlaps with the sixth protection device 29, so that the sixth protection device 29 and the first extension section 253A share the space in the second direction Z, which is beneficial to improve the energy density of the battery 100D.

[0142] Except for the above differences, the parameters of the battery 100D and the battery 100B are substantially the same, and reference may be made to the description of the battery 100B.

[0143] Example 5 Please also read Fig.15 and Fig.16 One embodiment of the present application further provides a battery 100E. The difference between the battery 100E and the battery 100C is that the circuit board assembly 20 includes a third circuit board 25.

[0144] The third circuit board 25 includes a third portion 251 and a second connector 252. When viewed along the first direction X, the third portion 251 extends in a direction away from the top wall 121. The second connector 252 is disposed on the third portion 251 and is configured to be connected to an external circuit. The second connector 252 cooperates with the first connector 222 to improve the current carrying capacity of the circuit board assembly 20.

[0145] When observed along the second direction Z, the third part 251 does not overlap with the substrate 21. The third part 251 and the first part 221 are arranged on both sides of the substrate 21 along the third direction Y to reduce the space waste in the second direction Z caused by the overlap of the third part 251 with the substrate 21, which is beneficial to improving the energy density of the battery 100E.

[0146] Please also read Fig.15 and Fig.16 In some embodiments, the third circuit board 25 includes a connecting portion 253, the connecting portion 253 is connected to the substrate 21, the connecting portion 253 and the bending portion 125A are arranged along the second direction Z, and the third portion 251 extends from the connecting portion 253 in a direction away from the top wall 121. The connecting portion 253 can provide a margin of movement for the third portion 251, so that the second connector 252 can be connected to an external circuit.

[0147] The bending portion 125A includes a third recess 1255. Along the second direction Z, the distance between the first body portion 1251 and the top wall 121 is greater than the distance between the third recess 1255 and the top wall 121. The third recess 1255 forms an accommodation space. The third recess 1255 and the first recess 1252 are disposed on both sides of the first body portion 1251 along the third direction Y.

[0148] In some embodiments, when viewed along the second direction Z, at least a portion of the connection portion 253 overlaps with the third recess 1255. When connected to an external circuit, at least a portion of the connection portion 253 can be embedded in the accommodation space formed by the third recess 1255. On the one hand, it is convenient for the second connector 252 to extend into the mainboard compartment of the terminal device and connect to the mainboard of the terminal device; on the other hand, it is beneficial to improve the energy density of the battery 100E.

[0149] In some embodiments, at least a portion of the connecting portion 253 is disposed in the accommodating space formed by the third recess 1255, and when observed along the third direction Y, at least a portion of the connecting portion 253 overlaps with the first main body portion 1251, so that the connecting portion 253 and the bending portion 125A share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100E.

[0150] In some embodiments, the connecting portion 253 includes a fourth extension segment 253D, a fifth extension segment 253E, a sixth extension segment 253F, and a seventh extension segment 253G. The fourth extension segment 253D is connected between the substrate 21 and the fifth extension segment 253E. The fifth extension segment 253E and the third recess 1255 are arranged along the second direction Z. When viewed along the first direction X, the fourth extension segment 253D is tilted relative to the fifth extension segment 253E along the second direction Z, so that the connecting portion 253 can extend into the accommodation space formed by the third recess 1255. The seventh extension segment 253G and the fifth extension segment 253E are arranged along the second direction Z and are located on the side of the fifth extension segment 253E away from the third recess 1255. The sixth extension segment 253F is connected between the fifth extension segment 253E and the seventh extension segment 253G and extends along the second direction Z. The sixth extension segment 253F can provide a movable margin between the fifth extension segment 253E and the seventh extension segment 253G. The third portion 251 extends from the seventh extension segment 253G in a direction away from the top wall 121 , so that the first connector 222 disposed on the third portion 251 can be connected to an external circuit.

[0151] Furthermore, the fifth extension section 253E abuts against the third recess 1255 to further improve the energy density of the battery 100E.

[0152] Please also read Fig.15 and Fig.16 In some embodiments, the circuit board assembly 20 includes a third protection device 26, which is connected to the third portion 251 and is configured to form a protection circuit for protecting the battery cell 10. When viewed along the second direction Z, the third protection device 26 does not overlap with the substrate 21, so as to reduce the space waste in the second direction Z caused by the overlap between the third protection device 26 and the substrate 21, which is beneficial to improve the energy density of the battery 100E.

[0153] In some embodiments, the third protection device 26 is a SIP module.

[0154] It can be understood that in some embodiments, the third protection device 26 includes an electronic device and an injection molded body, the electronic device is directly welded to the third part 251, and the injection molded body covers the electronic device and the portion of the third part 251 where the electronic device is provided to protect the electronic device.

[0155] Please also read Fig.15 and Fig.16 In some embodiments, the circuit board assembly 20 includes a sixth protection device 29, which is connected to the connecting portion 253. When observed along the second direction Z, the sixth protection device 29 does not overlap with the substrate 21, and the sixth protection device 29 is configured to form a protection circuit for protecting the battery cell 10.

[0156] In some embodiments, at least a portion of the sixth protection device 29 is disposed in the accommodating space formed by the third recess 1255, and when observed along the third direction Y, the sixth protection device 29 overlaps with the first main body portion 1251 and / or the pole tab 13, so that the sixth protection device 29 and the first main body portion 1251 and / or the pole tab 13 share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100E.

[0157] In some embodiments, the sixth protection device 29 is a SIP module.

[0158] It can be understood that in some embodiments, the sixth protection device 29 includes an electronic device and an injection molded body, the electronic device is directly welded to the connecting portion 253, and the injection molded body covers the electronic device and the portion of the connecting portion 253 where the electronic device is provided to protect the electronic device.

[0159] See also Fig.15 In some embodiments, along the second direction Z, the sixth protection device 29 is located between the fifth extension segment 253E and the seventh extension segment 253G, and the sixth protection device 29 is connected to the surface of the fifth extension segment 253E facing the seventh extension segment 253G or the surface of the seventh extension segment 253G facing the fifth extension segment 253E. And when viewed along the third direction Y, the sixth protection device 29 overlaps with the tab 13, so that the sixth protection device 29 and the tab 13 share the space in the second direction Z, which is beneficial to improve the energy density of the battery 100E.

[0160] See also Fig.17 In some embodiments, along the second direction Z, the sixth protection device 29 is located on the surface of the fifth extension segment 253E facing the third recess 1255, and at least a portion of the sixth protection device 29 is disposed in the accommodating space formed by the third recess 1255, so that the sixth protection device 29 and the bending portion 125A share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100E.

[0161] See also Fig.18 In some embodiments, the sixth protection device 29 is located on the surface of the seventh extension segment 253G away from the fifth extension segment 253E. When viewed along the third direction Y, the sixth protection device 29 overlaps with the substrate 21, so that the sixth protection device 29 and the substrate 21 share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100C. When viewed along the first direction X, the third portion 251 overlaps with the sixth protection device 29, so that the sixth protection device 29 and the third portion 251 share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100E.

[0162] Except for the above differences, the parameters of the battery 100E and the battery 100C are substantially the same, and reference may be made to the description of the battery 100C above.

[0163] Example 6 See also Fig.19 One embodiment of the present application further provides a battery 100F. The difference between the battery 100F and the battery 100D is that the circuit board assembly 20 does not include the second protection device 24 and the sixth protection device 29.

[0164] Except for the above differences, the parameters of the battery 100F and the battery 100D are substantially the same, and reference may be made to the description of the battery 100D above.

[0165] Example 7 Please also read Fig. 20 and Fig.21 One embodiment of the present application further provides a battery 100G. The difference between the battery 100G and the battery 100F lies in the difference in the structures of the second portion 223 and the connecting portion 253.

[0166] The second portion 223 is an unbent sheet-like structure. The second portion 223 is connected to the substrate 21, and the second portion 223 and the bent portion 125A are arranged along the second direction Z. The first portion 221 extends from one edge of the second portion 223 in the first direction X in a direction away from the top wall 121, and the first portion 221 and the second portion 223 form an "L"-shaped structure. The second portion 223 can provide a margin of movement for the first portion 221, so that the first connector 222 can be connected to an external circuit.

[0167] Except for the above differences, the parameters of battery 100G and battery 100F are substantially the same, and reference may be made to the description of battery 100F above.

[0168] Example 8 Please also read Fig. 22 and Fig.23 One embodiment of the present application further provides a battery 100H. The battery 100H is different from the battery 100A in that the position of the first circuit board 22 relative to the base plate 21 is different.

[0169] The substrate 21 includes two sub-substrates 21A. When viewed along the second direction Z, the two sub-substrates 21A are spaced apart along the third direction Y, and the two sub-substrates 21A overlap with one pole lug 13 respectively. Along the third direction Y, the first portion 221 is disposed between the two sub-substrates 21A to reduce the space waste in the second direction Z caused by the overlap of the first portion 221 and the substrate 21, which is beneficial to improving the energy density of the battery 100H.

[0170] In some embodiments, the substrate 21 includes two connectors 213 , one side of a connector 213 is connected to one side of a sub-substrate 21A facing the top wall 121 , and the other side is connected to a tab 13 , so as to improve the stability of the connection between the tab 13 and the substrate 21 .

[0171] In some embodiments, the first circuit board 22 includes a fourth portion 224, the fourth portion 224 and the bending portion 125A are arranged along the second direction Z, the fourth portion 224 is connected between the two sub-substrates 21A, and the first portion 221 extends from the fourth portion 224 in a direction away from the top wall 121. The fourth portion 224 can provide a margin for the first portion 221 to facilitate the connection of the first connector 222 with an external circuit.

[0172] In some embodiments, a first notch 224A is provided at an edge of the fourth portion 224 along the first direction X, and the first notch 224A has a first edge 2241 extending along the third direction Y. One end of the first portion 221 is located in the first notch 224A and connected to the first edge 2241, so that the first connector 222 and the first protection device 23 on the first portion 221 share the space in the first direction X with the fourth portion 224, which is beneficial to improving the energy density of the battery 100H.

[0173] Please also read Fig. 22 and Fig.23 In some embodiments, the first circuit board 22 includes a fifth portion 225 and a third connector 226. When viewed along the first direction X, the fifth portion 225 extends from the fourth portion 224 in a direction away from the top wall 121, and the fifth portion 225 and the first portion 221 are spaced apart along the third direction Y. The third connector 226 is disposed on the fifth portion 225 and is configured to be connected to an external circuit. The third connector 226 cooperates with the first connector 222 to improve the current carrying capacity of the circuit board assembly 20.

[0174] In some embodiments, the circuit board assembly 20 includes a fourth protection device 27, the fourth protection device 27 is connected to the fifth portion 225, and the fourth protection device 27 is configured to form a protection circuit for protecting the battery cell 10. When viewed along the second direction Z, the fourth protection device 27 does not overlap with the substrate 21, so as to reduce the space waste in the second direction Z caused by the overlap of the fourth protection device 27 with the substrate 21, which is beneficial to improve the energy density of the battery 100H.

[0175] It can be understood that the structure of the fourth protection device 27 is substantially the same as that of the first protection device 23 , and reference may be made to the description of the first protection device 23 .

[0176] In some embodiments, the fourth portion 224 is provided with a second notch 224B at an edge along the first direction X, and the second notch 224B has a second edge 2242 extending along the third direction Y. One end of the fifth portion 225 is located in the second notch 224B and connected to the second edge 2242, so that the third connector 226 and the fourth protection device 27 on the fifth portion 225 share the space in the first direction X with the fourth portion 224, which is beneficial to improving the energy density of the battery 100H.

[0177] Except for the above differences, the parameters of the battery 100H and the battery 100A are substantially the same, and reference may be made to the description of the battery 100A.

[0178] Example 9 See also Fig.24 One embodiment of the present application further provides a battery 100I. The difference between the battery 100I and the battery 100H is that the circuit board assembly 20 includes a fifth protection device 28.

[0179] The fifth protection device 28 is connected to the fourth portion 224, and is configured to form a protection circuit for protecting the battery cell 10. When viewed along the third direction Y, the fifth protection device 28 overlaps with the sub-substrate 21A, so that the fifth protection device 28 and the substrate 21 share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100I.

[0180] In some embodiments, the fifth protection device 28 is a SIP module.

[0181] It can be understood that in some embodiments, the fifth protection device 28 includes an electronic device and an injection molded body, the electronic device is directly welded to the fourth part 224, and the injection molded body covers the electronic device and the portion of the fourth part 224 where the electronic device is provided to protect the electronic device.

[0182] Except for the above differences, the parameters of the battery 100I and the battery 100H are substantially the same, and reference may be made to the description of the battery 100I above.

[0183] Example 10 See also Fig.25 One embodiment of the present application further provides a battery 100J. The difference between the battery 100J and the battery 100I lies in the different structure of the fourth portion 224.

[0184] The fourth portion 224 is recessed toward the bent portion 125A to fully utilize the space between the two sub-substrates 21A and further improve the energy density of the battery.

[0185] The bending portion 125A includes two second body portions 1253 and a second recess 1254. Along the second direction Z, the distance between the second body portion 1253 and the top wall 121 is greater than the distance between the second recess 1254 and the top wall 121. The second recess 1254 forms an accommodation space. Along the second direction Z, a sub-base 21A is disposed opposite to a second body portion 1253. A tab 13 extends from a second body portion 1253 and is connected to a side of a sub-base 21A close to the second body portion 1253.

[0186] In some embodiments, when viewed along the second direction Z, at least a portion of the fourth portion 224 overlaps the second recess 1254. When connected to an external circuit, at least a portion of the fourth portion 224 can be embedded in the accommodation space formed by the second recess 1254. On the one hand, it is convenient for the first connector 222 and the third connector 226 to extend into the mainboard compartment of the terminal device and connect to the mainboard of the terminal device; on the other hand, it is beneficial to improve the energy density of the battery 100J.

[0187] In some embodiments, at least a portion of the fourth portion 224 is disposed in the accommodating space formed by the second recess 1254, and when observed along the third direction Y, at least a portion of the fourth portion 224 overlaps with the second main body portion 1253, so that the fourth portion 224 and the second main body portion 1253 share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100J.

[0188] In some embodiments, the distance between the second body portion 1253 and the top wall 121 is D3, the distance between the second recess 1254 and the top wall 121 is D4, and 0mm<D3-D4≤0.3mm, so as to reduce the risk of the second recess 1254 being excessively recessed and interfering with the top wall 121.

[0189] Optionally, D3-D4 is one of 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm and any other value in the range of 0 mm<D3-D4≤0.3 mm.

[0190] It should be noted that D3 is measured in the following manner: 3 measuring points are selected on the surface of each second body portion 1253 facing the top wall 121, and the spacing value between each measuring point and the top wall 121 along the second direction Z is measured, and the average value of the 6 spacing values ​​is calculated, and the average value is D3. D4 is measured in the following manner: 3 measuring points are selected on the surface of the second recess 1254 close to the top wall 121, and the spacing value between each measuring point and the top wall 121 along the second direction Z is measured, and the average value of the 3 spacing values ​​is calculated, and the average value is D4.

[0191] See also Fig.25 In some embodiments, the fourth portion 224 includes two eighth segments 224C and a ninth segment 224D connected between the two eighth segments 224C. One end of an eighth segment 224C away from the ninth segment 224D is connected to a sub-base 21A. When viewed along the first direction X, the eighth segment 224C is tilted relative to the ninth segment 224D along the second direction Z so that the ninth segment 224D can extend into the accommodation space formed by the second recess 1254. The first portion 221 extends from the ninth segment 224D in a direction away from the top wall 121 so that the first connector 222 provided on the first portion 221 can be connected to an external circuit.

[0192] Furthermore, the ninth segment 224D abuts against the second recess 1254 to further improve the energy density of the battery 100J.

[0193] The fifth protection device 28 is connected to the ninth segment 224D. Along the third direction Y, the fifth protection device 28 is located between the two eighth segments 224C. When observed along the third direction Y, the fifth protection device 28 overlaps with the pole tab 13, so that the fifth protection device 28 and the pole tab 13 share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100J.

[0194] Except for the above differences, the parameters of the battery 100J and the battery 100I are substantially the same, and reference may be made to the description of the above battery 100I.

[0195] Embodiment 11 See also Fig.26 One embodiment of the present application further provides a battery 100K. The difference between the battery 100K and the battery 100H is that the substrate 21 includes a connecting plate 214 .

[0196] The connecting plate 214 connects the two sub-base plates 21A, and the connecting plate 214 is connected to the fourth portion 224, and the connecting plate 214 and the fourth portion 224 are arranged along the second direction Z to improve the structural stability of the circuit board assembly 20. The connecting plate 214 and the first portion 221 are arranged along the first direction X so that the connecting plate 214 and the first portion 221 share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100K.

[0197] Example 12 See also Fig. 27 One embodiment of the present application further provides a terminal device 200, comprising the battery (100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J, 100K) in any of the above embodiments.

[0198] Optionally, the terminal device 200 can be a mobile phone, a tablet computer, a laptop computer, a smart wearable product (e.g., a smart watch, a smart bracelet), a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, or other device with a rechargeable battery.

[0199] In some embodiments, the terminal device 200 includes a housing 91 and a mainboard 92, the housing 91 is provided with a battery compartment 911 and a mainboard compartment 912, the battery cell 10 is arranged in the battery compartment 911, and the mainboard 92 is arranged in the mainboard compartment 912. The first portion 221 extends into the mainboard compartment 912, the first connector 222 extends into the mainboard compartment 912 and is connected to the mainboard 92, and the first protection device 23 is located in the mainboard compartment 912.

[0200] In some embodiments, the third portion 251 extends into the mainboard compartment 912 , the second connector 252 extends into the mainboard compartment 912 to connect with the mainboard 92 , and the third protection device 26 is located in the mainboard compartment 912 .

[0201] In summary, in the above-mentioned batteries (100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J, 100K) and the terminal device 200, the first circuit board 22 includes a first part 221 and a first connector 222. When observed along the first direction X, the first part 221 extends in a direction away from the top wall 121. When observed along the second direction Z, the substrate 21 overlaps with the two pole ears 13, and the first part 221 does not overlap with the substrate 21, so as to reduce the space waste in the second direction Z caused by the overlap of the first part 221 with the substrate 21, which is beneficial to improve the energy density of the batteries (100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J, 100K).

[0202] In addition, those skilled in the art may also make other changes within the spirit of the present application. Of course, these changes made according to the spirit of the present application should be included in the scope disclosed in the present application.

Claims

1. A battery, characterized in that: The battery comprises: A battery cell, the battery cell comprising an electrode assembly, a packaging bag and two tabs, the packaging bag comprising a main body and a packaging part, the electrode assembly is arranged in the main body, the main body comprises a top wall, the packaging part comprises a top sealing part, the top sealing part is connected to the top wall, the top sealing part comprises a bending part, when viewed along a first direction, the bending part and the top wall are arranged along a second direction, the tabs extend from the bending part, and the thickness direction of the battery cell is the first direction; A circuit board assembly, the circuit board assembly comprising a substrate and a first circuit board electrically connected to the substrate; when viewed along the first direction, the substrate and the bending portion are arranged along the second direction; the two pole ears are arranged along a third direction and are electrically connected to the substrate; the first direction, the second direction and the third direction are perpendicular to each other; the first circuit board comprises a first portion and a first connector; when viewed along the first direction, the first portion extends in a direction away from the top wall; the first connector is disposed on the first portion; when viewed along the second direction, the substrate overlaps with the two pole ears, and the first portion does not overlap with the substrate.

2. The battery according to claim 1, characterized in that The first circuit board includes a second portion, the second portion is connected to the substrate and the first portion, the second portion and the bending portion are arranged along the second direction, and the first portion extends from the second portion in a direction away from the top wall.

3. The battery according to claim 2, characterized in that The battery satisfies at least one of the following conditions: (1) The circuit board assembly includes a first protection device, the first protection device is connected to the first portion, and when viewed along the second direction, the first protection device does not overlap with the substrate; (2) The circuit board assembly includes a second protection device, the second protection device is connected to the second portion; when viewed along the second direction, the second protection device does not overlap with the substrate; And / or when viewed along the third direction, the second protection device overlaps with the substrate.

4. The battery according to claim 3, characterized in that The second portion includes a first section, a second section and a third section, the first section is connected to the substrate, the first section and the bending portion are arranged along the second direction, the third section and the first section are arranged along the second direction, and the third section is located at a side of the first section away from the bending portion along the second direction, the second section is connected between the first section and the third section and extends along the second direction, and the first portion extends from the third section along a direction away from the top wall; Along the second direction, the second protection device is located between the first segment and the third segment; or the second protection device is located between the first segment and the bending portion; or the second protection device is located on a surface of the third segment away from the first segment.

5. The battery according to claim 2, characterized in that The bending portion includes a first main body portion and a first recessed portion. The first main body portion and the substrate are arranged along the second direction. The tab extends from the first main body portion and is connected to the substrate. When viewed along the second direction, at least part of the second portion overlaps with the first recessed portion.

6. The battery according to claim 5, characterized in that The battery satisfies at least one of the following conditions: (1) The circuit board assembly includes a second protection device, the second protection device is connected to the second portion, and at least a portion of the second portion and / or the second protection device is disposed in an accommodation space formed by the first recess; (2) Along the second direction, the distance between the first body portion and the top wall is D1, the distance between the first recessed portion and the top wall is D2, and 0 mm < D1 - D2 ≤ 0.3 mm; (3) When viewed along the third direction, the second portion overlaps with the first main body portion, the second portion includes a fourth section, a fifth section, a sixth section and a seventh section, the fourth section is connected between the substrate and the fifth section, the fifth section and the first recess are arranged along the second direction, and when viewed along the first direction, the fourth section is inclined relative to the fifth section along the second direction, the seventh section and the fifth section are arranged along the second direction and are located on a side of the fifth section away from the first recess, the sixth section is connected between the fifth section and the seventh section and extends along the second direction, and the first portion extends from the seventh section in a direction away from the top wall.

7. The battery according to claim 6, characterized in that The battery satisfies at least one of the following conditions: (1) The circuit board assembly includes a second protection device; along the second direction, the second protection device is located between the fifth section and the seventh section, and when viewed along the third direction, the second protection device overlaps with the tab; or the second protection device is located on the surface of the fifth section facing the first recess, and at least a portion of the second protection device is disposed in the accommodation space formed by the first recess; or the second protection device is located on a surface of the seventh segment away from the fifth segment, and when viewed along the third direction, the second protection device overlaps with the substrate; (2) The fifth section abuts against the first recessed portion.

8. The battery according to claim 1, characterized in that The circuit board assembly includes a third circuit board, and the third circuit board includes a third part and a second connector arranged on the third part. When viewed along the first direction, the third part extends in a direction away from the top wall. When viewed along the second direction, the third part does not overlap with the substrate. The third part and the first part are arranged on both sides of the substrate along the third direction.

9. The battery according to claim 1, characterized in that The substrate includes two sub-substrates; viewed along the second direction, the two sub-substrates are spaced apart along the third direction, and the two sub-substrates overlap with one pole ear respectively; along the third direction, the first portion is disposed between the two sub-substrates.

10. The battery according to claim 9, characterized in that The first circuit board includes a fourth portion, the fourth portion and the bending portion are arranged along the second direction, the fourth portion is connected between the two sub-base boards, and the first portion extends from the fourth portion in a direction away from the top wall.

11. The battery according to claim 10, characterized in that The battery satisfies at least one of the following conditions: (1) The first circuit board includes a fifth portion and a third connector. When viewed along the first direction, the fifth portion extends from the fourth portion in a direction away from the top wall. The fifth portion is spaced apart from the first portion along the third direction. The third connector is disposed on the fifth portion. (2) the circuit board assembly includes a fifth protection device, the fifth protection device is connected to the fourth portion, and when viewed along the third direction, the fifth protection device overlaps with the sub-base plate; (3) the fourth portion is recessed toward the bending portion; (4) The bending portion includes two second main body portions and one second recessed portion, one sub-base plate is arranged opposite to one second main body portion, one pole ear extends from one second main body portion and is connected to one sub-base plate, and when viewed along the second direction, at least part of the fourth portion overlaps with the second recessed portion.

12. The battery according to claim 11, characterized in that The battery satisfies at least one of the following conditions: (1) At least a portion of the fourth portion is disposed in the accommodation space formed by the second recess; (2) Along the second direction, the distance between the second body portion and the top wall is D3, the distance between the second recessed portion and the top wall is D4, 0 mm < D3 - D4 ≤ 0.3 mm; (3) When viewed along the third direction, the fourth portion overlaps with the second main body portion, the fourth portion includes two eighth segments and a ninth segment connected between the two eighth segments, one end of the eighth segment away from the ninth segment is connected to one of the sub-substrates, and when viewed along the first direction, the eighth segment is inclined relative to the ninth segment along the second direction, and the first portion extends from the ninth segment in a direction away from the top wall.

13. The battery according to claim 12, characterized in that The battery satisfies at least one of the following conditions: (1) The circuit board assembly includes a fifth protection device, the fifth protection device is connected to the ninth segment, the fifth protection device is located between two eighth segments, and when viewed along the third direction, the fifth protection device overlaps with the tab; (2) The ninth section abuts against the second recessed portion.

14. The battery according to any one of claims 10 to 13, characterized in that The battery satisfies at least one of the following conditions: (1) The substrate includes a connecting plate, the connecting plate connects the two sub-substrates, the connecting plate is connected to the fourth portion, and the connecting plate and the fourth portion are arranged along the second direction, and the connecting plate and the first portion are arranged along the first direction; (2) A first notch is provided on an edge of the fourth portion along the first direction, the first notch has a first edge extending along the third direction, and one end of the first portion is located in the first notch and connected to the first edge.

15. A terminal device, characterized in that: The terminal device comprises the battery according to any one of claims 1 to 14.

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