Battery and terminal device

Abstract

The invention discloses a battery and a terminal device. The battery comprises a battery cell, a circuit board assembly and an adapter tab, the battery cell comprises an electrode assembly and a packaging bag. The packaging bag comprises a main body part and a packaging part. The electrode assembly is arranged in the main body part. The main body part comprises a top wall and a bottom wall, and the top wall and the bottom wall are arranged in a spaced mode in the second direction when observed in the first direction. The top wall comprises a first body wall and a first concave wall, and the first concave wall sinks towards the bottom wall in the second direction relative to the first body wall. The packaging part comprises a top sealing part, the top sealing part comprises a first part and a second part, the first part is connected with the first body wall, the second part is connected with the first concave wall and the first part, and the second part and the first concave wall form a first containing space. The circuit board assembly comprises a substrate, the substrate comprises a bearing part, and the bearing part is located in the first containing space. One end of the switching tab is electrically connected with the electrode assembly, and the other end of the switching tab extends out of the second part and is electrically connected with the bearing part. The battery is favorable for improving 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] In the existing battery structure, the substrate and the electronic devices connected to the substrate are usually arranged on the top wall of the battery cell. The electronic devices occupy a large space, which is not conducive to improving 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 battery cell, a circuit board assembly and a transfer tab. The battery cell comprises an electrode assembly and a packaging bag. The packaging bag comprises a main body and a packaging part. The electrode assembly is arranged in the main body. The main body comprises a top wall and a bottom wall, and the top wall and the bottom wall are arranged spaced apart along a second direction when viewed along a first direction. The first direction is the thickness direction of the battery cell, and the first direction and the second direction are perpendicular to each other. The top wall comprises a first body wall and a first concave wall, and the first concave wall is concave toward the bottom wall along the second direction relative to the first body wall. The packaging part comprises a top sealing part, the top sealing part comprises a first part and a second part, the first part is connected to the first body wall, the second part is connected to the first concave wall and the first part, and the second part and the first concave wall form a first accommodation space. The circuit board assembly comprises a substrate, the substrate comprises a bearing part, and the bearing part is located in the first accommodation space. One end of the transfer tab is electrically connected to the electrode assembly, and the other end of the transfer tab extends from the second part and is electrically connected to the bearing part.

[0005] In the above-mentioned battery, the first concave wall is recessed toward the bottom wall along the second direction relative to the first main body wall, the second part and the first concave wall form a first accommodating space, and the bearing part is located in the first accommodating space to reduce the space occupied by the circuit board assembly at the head of the battery, which is beneficial to improving the energy density of the battery.

[0006] In some embodiments of the present application, the first portion is bent toward the first body wall to reduce the space occupied by the top seal portion at the head of the battery, which is beneficial to improving the energy density of the battery. The second portion extends along the second direction, and the second portion includes a first side edge away from the bottom wall along the second direction, and the adapter tab extends from the first side edge to facilitate electrical connection to the load-bearing portion. When viewed along the first direction, the height difference between the first side edge and the first portion on the second side is L1, 0mm≤L1≤0.5mm, so as to limit the space occupied by the first side edge and the first portion at the head of the battery, which is beneficial to improving the energy density of the battery. In addition, L1 can also be used as a reserved tolerance to facilitate battery production.

[0007] In some embodiments of the present application, a first notch is provided on the first side, and part of the adapter tab is located in the first notch to reduce the space occupied by the adapter tab at the head of the battery, which is beneficial to improving the energy density of the battery.

[0008] In some embodiments of the present application, the circuit board assembly includes a first protection device, which is disposed on the bearing portion and located in the first accommodation space. The first protection device is configured to form a protection circuit for protecting the battery cell. The bearing portion and the first protection device are located in the first accommodation space to reduce the space waste caused by arranging the protection device at the head of the battery and improve the energy density of the battery. In addition, the first protection device can support the bearing portion to improve the structural strength of the bearing portion, thereby improving the stability of the connection between the bearing portion and the adapter tab.

[0009] In some embodiments of the present application, the circuit board assembly includes a second protection device. The substrate includes a first extension portion, the first extension portion extends from the load-bearing portion along the second direction in a direction away from the bottom wall, and the second protection device is arranged on the first extension portion. When viewed along the first direction, the second protection device is separated from the battery cell. The second protection device is configured to form a protection circuit for protecting the battery cell. When the first extension portion is located in the mainboard compartment of the terminal device and is connected to the mainboard of the terminal device, the second protection device can utilize the space in the mainboard compartment of the terminal device to reduce the space occupied by the protection device at the head of the battery, which is beneficial to improving the energy density of the battery.

[0010] In some embodiments of the present application, the main body includes two first side walls and two second side walls arranged between the top wall and the bottom wall, the two first side walls are arranged at intervals along the third direction, and the two second side walls are arranged at intervals along the first direction. The first direction, the second direction and the third direction are perpendicular to each other. The top wall includes two first concave walls arranged along the third direction, and the top seal includes two second parts, each of which is connected to a first concave wall and the first part. The battery includes two adapter tabs, each of which extends from a second part. The substrate includes two bearing parts, each of which is located in a first accommodating space and connected to a adapter tab. The electrode assembly forms a complete current loop with the circuit board assembly through two adapter tabs with different polarities.

[0011] In some embodiments of the present application, the packaging portion includes a side sealing portion, which is connected to the first side wall. The top wall includes two first sinking walls, each of which is arranged between a first concave wall and a corresponding first side wall. Along the second direction, the distance between the first main body wall and the bottom wall is D1, and the distance between the first sinking wall and the bottom wall is D2, 1mm≤D1-D2≤3mm, so that the main body is located at the corners of the two ends of the top wall to form a space for accommodating the packaging portion, reducing the space occupied by the portion of the packaging portion located at the corner at the head of the battery, which is beneficial to improving the energy density of the battery. The top sealing portion includes a third portion, which extends along the second direction, and the third portion connects the first sinking wall, the second portion and the side sealing portion to improve the stability of the package.

[0012] In some embodiments of the present application, the substrate includes a connecting portion, which is located on a side of the first portion away from the first body wall along the second direction, and the bearing portion extends from the connecting portion along the second direction toward the first accommodating space. The two bearing portions are connected by the connecting portion to electrically connect two adapter ears with different polarities to form a complete current loop. The height difference between the side of the third portion away from the bottom wall and the connecting portion in the second direction is L2, 0mm≤L2≤0.5mm, so as to limit the space occupied by the third portion at the head of the battery, which is beneficial to improve the energy density of the battery. In addition, L2 can also be used as a reserved tolerance to facilitate the production of the battery.

[0013] In some embodiments of the present application, one of the second side walls includes a second body wall, a second sinking wall and a connecting wall. When viewed from the first direction, the connecting wall is spaced from the first body wall along the second direction. The second sinking wall is connected to the first body wall on one side in the second direction, the second sinking wall is connected to the connecting wall on the other side in the second direction, and the connecting wall is connected to the second body wall on the other side in the first direction. The second sinking wall and the connecting wall form a second accommodating space, and the second accommodating space is connected to the two first accommodating spaces along the third direction. The substrate includes a connecting portion and a first extending portion, the connecting portion connects two bearing portions, the bearing portion extends from the connecting portion toward the first accommodating space, and the first extending portion extends from the bearing portion along the second direction in a direction away from the bottom wall. At least part of the first extending portion is located in the second accommodating space, the first extending portion shares the space in the second direction with the second sinking wall, and the first extending portion shares the space in the first direction with the connecting wall, so as to reduce the space occupied by the circuit board assembly in the first direction and the second direction, thereby facilitating the improvement of the energy density of the battery.

[0014] In some embodiments of the present application, one of the second side walls includes a second body wall, a second sinking wall and a connecting wall. When viewed from the first direction, the connecting wall is spaced from the first body wall along the second direction. The second sinking wall is connected to the first body wall on one side in the second direction, the second sinking wall is connected to the connecting wall on one side in the first direction on the other side in the second direction, and the connecting wall is connected to the second body wall on the other side in the first direction. The second sinking wall and the connecting wall form a second accommodating space, and the second accommodating space is connected to the two first accommodating spaces along the third direction. The substrate includes a connecting portion and a first extending portion, the connecting portion connects two bearing portions, the bearing portion extends from the connecting portion toward the first accommodating space, and the first extending portion extends from the bearing portion along the second direction in a direction away from the bottom wall. At least part of the connecting portion is located in the second accommodating space, the connecting portion and the second sinking wall share the space in the second direction, and the connecting portion and the connecting wall share the space in the first direction, so as to reduce the space occupied by the circuit board assembly in the first direction and the second direction, which is conducive to improving the energy density of the battery.

[0015] In some embodiments of the present application, the electrode assembly includes an electrode body portion and an electrode thinning portion. Along the first direction, the thickness of the electrode body portion is T1, and the thickness of the electrode thinning portion is T2, 0.1mm≤T1-T2≤0.5mm. Along the first direction, the electrode body portion overlaps with the second body wall, and the electrode thinning portion overlaps with the second sinking wall, so as to improve the space utilization of the electrode assembly in the main body, which is beneficial to improving the capacity of the battery.

[0016] In some embodiments of the present application, the packaging portion includes a side sealing portion, and the side sealing portion is connected to the first side wall. The two first concave walls are connected to each other, and the two first accommodating spaces are interconnected, so as to shorten the length of the connecting portion in the third direction and reduce the production cost of the circuit board assembly. The first body wall includes two first sub-walls arranged on both sides of the two first concave walls along the third direction, the first part includes two first sub-parts, each first sub-part is connected to a first sub-wall, and the second part is connected to the two first sub-parts, so as to improve the packaging stability of the top sealing part.

[0017] In some embodiments of the present application, when viewed along the first direction, the first sub-portion and the side sealing portion are spaced apart to reduce space waste caused by forming an angled structure at the corner of the packaging portion of the main body, which is beneficial to improving the energy density of the battery.

[0018] In some embodiments of the present application, the top wall includes a first oblique wall, and the first oblique wall is arranged between the first sub-wall and the corresponding first side wall. When viewed along the first direction, the first oblique wall is inclined relative to the first sub-wall and the first side wall. The top sealing portion includes a fourth portion, and the fourth portion connects the first oblique wall, the first sub-portion and the side sealing portion to reduce the risk of stress concentration at the corner of the packaging portion, and is conducive to improving the packaging stability at the corner.

[0019] In some embodiments of the present application, the packaging portion includes a side sealing portion, which is connected to the first side wall. The two first concave walls are connected to each other, and the two first accommodating spaces are connected to each other, so as to shorten the length of the connecting portion in the third direction and reduce the production cost of the circuit board assembly. One of the first concave walls is connected to one of the first side walls, and the other first concave wall is connected to the first body wall.

[0020] In some embodiments of the present application, when observed along the first direction, the first portion is spaced apart from the first side wall away from the two first recessed walls to reduce space waste caused by forming an angle structure at the corner of the packaging portion of the main body, which is beneficial to improving the energy density of the battery.

[0021] In some embodiments of the present application, the top wall includes a first inclined wall, and the first inclined wall is arranged between the first body wall and the first side wall away from the two first concave walls. When viewed along the second direction, the first inclined wall is inclined relative to the first body wall and the first side wall. The top sealing portion includes a fourth portion, and the fourth portion connects the first inclined wall, the first portion and the side sealing portion to reduce the risk of stress concentration at the corner of the packaging portion, and is conducive to improving the packaging stability at the corner.

[0022] In some embodiments of the present application, the electrode assembly includes a pole piece group and an inner pole ear. A first concave surface is provided at a portion of the pole piece group adjacent to the first concave wall, the inner pole ear extends from the first concave surface, and the inner pole ear is connected to the transfer pole ear to form a joint. The joint is located between the first concave surface and the first concave wall, so that the joint and the pole piece group share the space in the second direction, which is beneficial to improve the energy density of the battery.

[0023] An embodiment of the present application further provides a terminal device, which includes any one of the batteries in the above embodiments.

[0024] The embodiment of the present application also provides a terminal device, the terminal device includes a mainboard, a third protection device and a battery, the battery is electrically connected to the mainboard, and the third protection device is arranged on the mainboard. The battery includes a battery cell, a circuit board assembly and a transfer pole ear. The battery cell includes an electrode assembly and a packaging bag. The packaging bag includes a main body and a packaging part. The electrode assembly is arranged in the main body. The main body includes a top wall and a bottom wall, and the top wall and the bottom wall are arranged spaced along the second direction when viewed along the first direction. The first direction is the thickness direction of the battery cell, and the first direction and the second direction are perpendicular to each other. The top wall includes a first body wall and a first concave wall, and the first concave wall is concave toward the bottom wall along the second direction relative to the first body wall. The packaging part includes a top sealing part, the top sealing part includes a first part and a second part, the first part is connected to the first body wall, the second part is connected to the first concave wall and the first part, and the second part and the first concave wall form a first accommodation space. The circuit board assembly includes a substrate, the substrate includes a bearing part, and the bearing part is located in the first accommodation space. One end of the transfer pole ear is electrically connected to the electrode assembly, and the other end of the transfer pole ear extends from the second part and is electrically connected to the bearing part. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the front structure of a battery in a first direction in an embodiment of the present application.

[0026] Figure 2 It is a schematic diagram of the back structure of a battery in a first direction in an embodiment of the present application.

[0027] Figure 3 yes Figure 1 Schematic diagram of the disassembled structure of the battery.

[0028] Figure 4 yes Figure 1 Partial cross-sectional view of the battery along section line AA.

[0029] Figure 5 yes Figure 1 Schematic diagram of the structure of the electrode assembly of the battery.

[0030] Figure 6 It is a schematic diagram of the structure of the second insulating member and the third insulating member of a battery in one embodiment of the present application.

[0031] Figure 7 It is a schematic diagram of the structure of a battery in another embodiment of the present application.

[0032] Figure 8 It is a schematic diagram of the structure of a battery in another embodiment of the present application.

[0033] Fig. 9 It is a schematic diagram of the structure of a battery in another embodiment of the present application.

[0034] Fig.10 It is a schematic diagram of the structure of a battery in another embodiment of the present application.

[0035] Fig.11 yes Fig.10 Schematic diagram of the structure of the electrode assembly of the battery.

[0036] Fig.12 It is a schematic diagram of the structure of a battery in another embodiment of the present application.

[0037] Fig.13 It is a schematic diagram of the structure of a battery in another embodiment of the present application.

[0038] Fig.14 yes Fig.13 Schematic diagram of the structure of the electrode assembly of the battery.

[0039] Fig.15 It is a schematic diagram of the structure of a battery in another embodiment of the present application.

[0040] Fig.16 yes Fig.15 Schematic diagram of the structure of the electrode assembly of the battery.

[0041] Fig.17 It is a schematic diagram of the structure of a terminal device in an embodiment of the present application.

[0042] Fig.18 It is a schematic diagram of the structure of a terminal device in another embodiment of the present application.

[0043] Fig.19 It is a schematic diagram of the structure of a terminal device in another embodiment of the present application.

[0044] Main component symbols Battery 100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J Terminal devices 200A, 200B, 200C Battery 1 Electrode assembly 10 Electrode body 10A Electrode thinning portion 10B Pole piece group 11 The first concave surface 111 First side 111A Second surface 111B Third side 111C Inner ear 12 Joint 121 Packaging bag 20 Main body 20A Top wall 21 first body wall 211 First sub-wall 211A First concave wall 212 First Wall 2121 Second Wall 2122 The Third Wall 2123 The first sinking wall 213 First inclined wall 214 Bottom wall 22 First side wall 23 Second side wall 24 Second body wall 241 Second sinking wall 242 Connecting wall 243 Packaging part 20B Top seal 25 Part 1251 First bending portion 2511 The second bending portion 2512 First subsection 251A Part 2252 First side 2521 Gap 2522 Part 3253 Part 4 254 Side seal 26 First accommodating space 20C The second accommodating space 20D Circuit board assembly 2 Substrate 30 Carrying part 31 Connecting part 32 The first extension portion 33 The first extension section 331 First sub-segment 331A Second subsection 331B Third subsection 331C The second extension section 332 First area 33A Second area 33B Connector 41 First connecting section 411 The second connecting section 412 Opening 413 The first protection device 42 Connector 43 The second protection device 44 First reinforcement plate 45 First insulating member 51 Second insulating member 52 The third insulating member 53 Adapter tab 3 First paragraph 301 Section 2 302 Section 303 Ear glue 304 Motherboard 60 The third protection device 70 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

[0045] 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.

[0046] 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%.

[0047] 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.

[0048] 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.

[0049] One embodiment of the present application provides a battery, the battery comprising a battery cell, a circuit board assembly and a transfer tab. The battery cell comprises an electrode assembly and a packaging bag. The packaging bag comprises a main body and a packaging part. The electrode assembly is arranged in the main body. The main body comprises a top wall and a bottom wall, and the top wall and the bottom wall are arranged spaced apart along a second direction when viewed along a first direction. The first direction is the thickness direction of the battery cell, and the first direction and the second direction are perpendicular to each other. The top wall comprises a first body wall and a first concave wall, and the first concave wall is concave toward the bottom wall along the second direction relative to the first body wall. The packaging part comprises a top sealing part, the top sealing part comprises a first part and a second part, the first part is connected to the first body wall, the second part is connected to the first concave wall and the first part, and the second part and the first concave wall form a first accommodation space. The circuit board assembly comprises a substrate, the substrate comprises a bearing part, and the bearing part is located in the first accommodation space. One end of the transfer tab is electrically connected to the electrode assembly, and the other end of the transfer tab extends from the second part and is electrically connected to the bearing part.

[0050] In the above-mentioned battery, the first concave wall is recessed toward the bottom wall along the second direction relative to the first main body wall, the second part and the first concave wall form a first accommodating space, and the bearing part is located in the first accommodating space to reduce the space occupied by the circuit board assembly at the head of the battery, which is beneficial to improving the energy density of the battery.

[0051] The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0052] Example 1 Please also read Figures 1 to 4 One embodiment of the present application provides a battery 100A, the battery 100A comprising a battery cell 1, a circuit board assembly 2 and a transfer tab 3. The battery 100A may be, but is not limited to, a secondary battery, which refers to a battery that can be used continuously by activating active materials by charging after the battery is discharged.

[0053] The battery cell 1 includes an electrode assembly 10 and a packaging bag 20. The electrode assembly 10 is used to convert chemical energy into electrical energy. The packaging bag 20 is made of a packaging film by punching, folding and heat sealing. The thickness direction of the battery cell 1 is a first direction X, the length direction of the battery cell 1 is a second direction Z, and the width direction of the battery cell 1 is a third direction Y. The first direction X, the second direction Z and the third direction Y are perpendicular to each other.

[0054] The packaging bag 20 includes a main body 20A and a sealing part 20B. The main body 20A is a part where the holes are formed, and the sealing part 20B is a part where the sealing films are overlapped and joined. The electrode assembly 10 is disposed in the main body 20A.

[0055] Please also read Figure 1 and Figure 2The main body 20A includes a top wall 21 and a bottom wall 22. When viewed along the first direction X, the top wall 21 and the bottom wall 22 are spaced apart along the second direction Z. The top wall 21 includes a first body wall 211 and a first concave wall 212. The first concave wall 212 is concave relative to the first body wall 211 along the second direction Z toward the bottom wall 22.

[0056] The packaging part 20B includes a top sealing part 25, which is used to improve the packaging stability of the top wall 21. The top sealing part 25 includes a first part 251 and a second part 252, the first part 251 is connected to the first body wall 211, the second part 221B is connected to the first concave wall 212 and the first part 251, and the second part 252 and the first concave wall 212 form a first accommodating space 20C.

[0057] Please also read Figure 1 and Figure 3 The circuit board assembly 2 includes a substrate 30, which includes a bearing portion 31, and the bearing portion 31 is located in the first accommodation space 20C. One end of the transfer tab 3 is electrically connected to the electrode assembly 10, and the other end of the transfer tab 3 extends from the second portion 252 and is electrically connected to the bearing portion 31.

[0058] In the above-mentioned battery 100A, the first recessed wall 212 is recessed relative to the first main body wall 211 along the second direction Z toward the bottom wall 22, the second portion 252 and the first recessed wall 212 form a first accommodating space 20C, and the supporting portion 31 is located in the first accommodating space 20C to reduce the space occupied by the circuit board assembly 2 at the head of the battery 100A, which is beneficial to improving the energy density of the battery 100A.

[0059] It should be noted that the head of the battery 100A refers to a position on one side of the first body wall 211 away from the bottom wall 22 .

[0060] Please also read Figure 1 , Figure 2 and Figure 3In some embodiments, the main body 20A includes two first side walls 23 and two second side walls 24 disposed between the top wall 21 and the bottom wall 22, the two first side walls 23 are spaced apart along the third direction Y, and the two second side walls 24 are spaced apart along the first direction X. The top wall 21 includes two first concave walls 212 arranged along the third direction Y, and the two first concave walls 212 are located at both ends of the first body wall 211 along the third direction Y. The top seal portion 25 includes two second portions 252, each of which connects a first concave wall 212 and a first portion 251. The two second portions 252 and the two first concave walls 212 form two first accommodating spaces 20C. The battery 100A includes two adapter tabs 3, the two adapter tabs 3 have different polarities, and each adapter tab 3 extends from a second portion 252. The substrate 30 includes two bearing portions 31, each of which is located in a first accommodating space 20C and connected to a adapter tab 3. The electrode assembly 10 forms a complete current loop with the circuit board assembly 2 through two switching tabs 3 with different polarities.

[0061] Please also read Figure 1 and Figure 3 In some embodiments, the first concave wall 212 includes a first wall 2121, a second wall 2122, and a third wall 2123. The first wall 2121 is connected to one end of the first body wall 211 along the third direction Y and extends toward the bottom wall 22, one end of the third wall 2123 is connected to the end of the first wall 2121 close to the bottom wall 22, and the third wall 2123 extends along the third direction Y, and one end of the second wall 2122 is connected to the end of the third wall 2123 away from the first wall 2121 and extends in a direction away from the bottom wall 22. Along the second direction Z, the third wall 2123 is closer to the bottom wall 22 than the first body wall 211.

[0062] In some embodiments, along the third direction Y, the first recessed wall 212 is spaced apart from the corresponding first side wall 23, that is, the second wall 2122 is spaced apart from the corresponding first side wall 23, so that the transfer tab 3 and the main body 20A are spaced apart at the corners at both ends of the top wall 21, thereby reducing the risk of reducing the packaging stability at the corners due to the transfer tab 3 being close to the corners.

[0063] Please also read Figure 1 and Figure 3 In some embodiments, the first portion 251 is bent toward the first body wall 211 to reduce the space occupied by the top seal portion 25 at the head of the battery 100A, which is beneficial to improve the energy density of the battery 100A. The second portion 252 extends along the second direction Z, and the second portion 252 includes a first side edge 2521 away from the bottom wall 22 along the second direction Z. The adapter tab 3 extends from the first side edge 2521 to facilitate electrical connection to the carrier portion 31.

[0064] In some embodiments, the first portion 251 includes a first bending portion 2511 and a second bending portion 2512, the first bending portion 2511 is connected to the first main body wall 211, the first bending portion 2511 and the first main body wall 211 are arranged opposite to each other along the second direction Z, the second bending portion 2512 is connected to the first side edge 2521 close to the first main body wall 211, and along the second direction Z, the projection of the second bending portion 2512 overlaps with the projection of the third wall 2123 to improve the packaging stability between the first portion 251 and the second portion 252.

[0065] Please also read Figure 1 and Figure 3 , viewed along the first direction X, the height difference between the first side 2521 and the first portion 251 in the second direction Z is L1, 0mm≤L1≤0.5mm, so as to limit the space occupied by the first side 2521 and the first portion 251 at the head of the battery 100A, which is beneficial to improve the energy density of the battery 100A. In addition, L1 can also be used as a reserved tolerance to facilitate the production of the battery 100A.

[0066] It should be noted that L1 is measured in the following manner: taking the edge of the first bending portion 2511 away from the first main body wall 211 as the reference line, measuring the spacing value between the first side edge 2521 and the reference line, the measurement is performed three times, and the average value of the three spacing values ​​is calculated, and the average value is L1.

[0067] Optionally, along the second direction Z, the first side 2521 is closer to the bottom wall 22 than the first portion 251, that is, the first side 2521 is lower than the first portion 251; or the first side 2521 is flush with the first portion 251; or the first portion 251 is closer to the bottom wall 22 than the first side 2521, that is, the first side 2521 is higher than the first portion 251. This application is described by taking the example that the first side 2521 is flush with the first portion 251.

[0068] Optionally, L1 is one of 0 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm and any other value in the range of 0 mm ≤ L1 ≤ 0.5 mm.

[0069] Please also read Figure 1 and Figure 3 In some embodiments, the first side 2521 is provided with a first notch 2522, and part of the adapter tab 3 is located in the notch 2522 to reduce the space occupied by the adapter tab 3 at the head of the battery 100A, which is beneficial to improving the energy density of the battery 100A.

[0070] In some embodiments, the portion of the adapter tab 3 extending from the first side 2521 includes a first section 301, a second section 302 and a third section 303, the first section 301 extending from the first side 2521 along the second direction Z, the second section 302 is bent and connected to the first section 301 and extends along the first direction X toward the bearing portion 31, and the third section 303 is bent and connected to the second section 302 and extends along the second direction Z toward the first recessed wall 212.

[0071] In some embodiments, the battery cell 1 includes a tab glue 304, a portion of which is located inside the second portion 252 and wraps the surface of the adapter tab 3 located inside the second portion 252, and a portion of which is located outside the second portion 252 and wraps at least a portion of the surface of the first section 301. The tab glue 40 located in the first section 301 is disposed in the first notch 2522 to reduce the space occupied by the tab glue 40 at the head of the battery 100A, which is beneficial to improving the energy density of the battery 100A.

[0072] Please also read Figure 1 , Figure 2 and Figure 3 In some embodiments, the packaging portion 20B includes a side sealing portion 26, which is connected to the first side wall 23 and bent toward the first side wall 23. Along the second direction Z, one end of the side sealing portion 26 protrudes out of the side sealing portion 26 and is connected to the top sealing portion 25 to improve packaging stability.

[0073] The top wall 21 includes two first sinking walls 213, each of which is disposed between a first concave wall 212 and a corresponding first side wall 23, that is, each of which is disposed between a second wall 2122 and a corresponding first side wall 23. Along the second direction Z, the distance between the first main body wall 211 and the bottom wall 22 is D1, and the distance between the first sinking wall 213 and the bottom wall 22 is D2, where D1>D2, so that the main body 20A is located at the corners at both ends of the top wall 21 to form a space for accommodating the packaging part 20B, reducing the space occupied by the packaging part 20B located at the corners at the head of the battery 100A, which is beneficial to improving the energy density of the battery 100A.

[0074] In some embodiments, the top sealing portion 25 includes a third portion 253, the third portion 253 extends along the second direction Z, and the third portion 253 connects the first sinking wall 213, the second portion 252 and the side sealing portion 26 to improve the stability of the package. The portion of the packaging portion 20B located at the corner refers to the third portion 253 and the portion where the side sealing portion 26 is connected to the third portion 253.

[0075] In some embodiments, 1mm≤D1-D2≤3mm. When D1-D2 is too small (e.g., less than 1mm), the third portion 253 may easily exceed the first portion 251 in the third direction Z, provided that the third portion 253 has a sufficient packaging width to ensure packaging stability, which is not conducive to improving the energy density of the battery 100A. When D1-D2 is too large (e.g., greater than 3mm), it may cause excessive occupation of the space of the electrode assembly 10 at the corner, resulting in a decrease in the energy density of the battery 100A. By limiting 1mm≤D1-D2≤3mm, it is beneficial to improve the energy density of the battery 100A.

[0076] Optionally, D1-D2 is 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm and any other value in the range of 1mm≤D1-D2≤3mm.

[0077] In some embodiments, along the third direction Y, the projection of the first sinking wall 213 is located between the projection of the first main wall 211 and the projection of the third wall 2123 of the corresponding first concave wall 212 , so that the carrying portion 31 is located in the first accommodating space 20C.

[0078] Please also read Figure 1 and Figure 3 In some embodiments, the substrate 30 includes a connecting portion 32, the connecting portion 32 is located on a side of the first portion 251 away from the first body wall 211 along the second direction Z, the connecting portion 32 connects two bearing portions 31, and the bearing portion 31 extends from the connecting portion 32 toward the first accommodating space 20C along the second direction Z. The two bearing portions 31 are connected by the connecting portion 32 to electrically connect two transfer tabs with different polarities, forming a complete current loop.

[0079] In some embodiments, the height difference between the side of the third portion 253 away from the bottom wall 22 and the connecting portion 32 in the second direction Z is L2, 0mm≤L2≤0.5mm, so as to limit the space occupied by the third portion 253 at the head of the battery 100A, which is beneficial to improve the energy density of the battery 100A. In addition, L2 can also be used as a reserved tolerance to facilitate the production of the battery 100A.

[0080] It should be noted that L2 is measured in the following manner: taking the edge of the connecting portion 32 away from the first main body wall 211 as the reference line, measuring the distance between the side of the third portion 253 away from the bottom wall 22 and the reference line, the measurement is performed three times, and the average value of the three distance values ​​is calculated, and the average value is L2.

[0081] Optionally, along the second direction Z, the side of the third portion 253 away from the bottom wall 22 is closer to the bottom wall 22 than the connecting portion 32, that is, the side of the third portion 253 away from the bottom wall 22 is lower than the connecting portion 32; or the side of the third portion 253 away from the bottom wall 22 is flush with the connecting portion 32; or the side of the connecting portion 32 away from the bottom wall 22 is closer to the bottom wall 22 than the side of the third portion 253, that is, the connecting portion 32 is higher than the side of the third portion 253 than the connecting portion 32. This application is described by taking the example that the side of the third portion 253 away from the bottom wall 22 is lower than the connecting portion 32.

[0082] Optionally, L2 is one of 0 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm and any other value in the range of 0 mm ≤ L2 ≤ 0.5 mm.

[0083] Please also read Figure 1 and Figure 3 In some embodiments, the battery 100A includes a first insulating member 51, and along the second direction Z, the first insulating member 51 is bonded between the connecting portion 32 and the first portion 251 to improve the insulation stability of the circuit board assembly 2 and the packaging bag 20, and to improve the stability of the circuit board assembly 2 at the head of the battery 100A.

[0084] Please also read Figure 1 , Figure 2 and Figure 4 In some embodiments, the circuit board assembly 2 includes a connector 41, which is connected to the side of the bearing portion 31 facing the second portion 252, and the connector 41 is connected to the adapter tab 3, which is conducive to improving the stability of the connection between the adapter tab 3 and the bearing portion 31. In addition, the bearing portion 31 and the connector 41 are located in the first accommodating space 20C to reduce the space waste caused by setting the connector 32 on the first body wall 211, thereby improving the energy density of the battery 100A.

[0085] In some embodiments, the connecting member 41 is a "U"-shaped connecting piece, and the connecting member 41 includes two first connecting segments 411 spaced apart along the first direction X, and a second connecting segment 412 connected to the two first connecting segments 411. One of the first connecting segments 411 is connected to the bearing portion 31, and an opening 413 is formed at one end of the two first connecting segments 411 away from the second connecting segment 412. The adapter tab 3 extends into the opening 413 and is connected to the other first connecting segment 411, so as to improve the stability of the connection between the connecting member 41 and the adapter tab 3.

[0086] It can be understood that, in some embodiments, the connecting member 41 is an “L”-shaped connecting piece, that is, the corresponding connecting piece can also achieve the above-mentioned electrical connection relationship by bending once.

[0087] It can be understood that, in some embodiments, the connecting member 41 is a flat nickel block.

[0088] Please also read Figure 1 , Figure 3 and Figure 4 In some embodiments, the circuit board assembly 2 includes a first protection device 42, the first protection device 42 is connected to the bearing portion 31, and the first protection device 40 is configured to form a protection circuit for protecting the battery cell 1. The protection circuit may provide, but is not limited to, protection functions such as overcharge, over-discharge, overcurrent, short circuit and anti-counterfeiting to the battery cell 1. The bearing portion 31 and the first protection device 42 are located in the first accommodating space 20C to reduce the space waste caused by setting the protection device at the head of the battery 100A and improve the energy density of the battery 100A. In addition, the first protection device 42 can support the bearing portion 31 to improve the structural strength of the bearing portion 31, thereby improving the stability of the connection between the bearing portion 31 and the connector 41 and the stability of the connection between the bearing portion 31 and the adapter tab 3.

[0089] In some embodiments, the configuration of the first protection device 42 needs to be selected according to the control logic design of the protection circuit. The first protection device 42 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.

[0090] In some embodiments, the first protection device 42 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.

[0091] It can be understood that, in some embodiments, the first protection device 42 includes an electronic device and an injection molded body, the electronic device is directly welded to the bearing portion 31, and the injection molded body covers the electronic device and the bearing portion 31 to protect the electronic device.

[0092] Please also read Figure 1 and Figure 3 In some embodiments, the substrate 30 includes a first extension portion 33, which extends from the load-bearing portion 31 along the second direction Z toward a direction away from the bottom wall 22, so that the circuit board assembly 2 is electrically connected to the external circuit outside the top sealing portion 25 through the first extension portion 33. The external circuit can be but is not limited to a mainboard of a terminal device powered by a battery 100A.

[0093] In some embodiments, the first extension portion 33 includes a first extension section 331 and a second extension section 332. The first extension section 331 is connected to the bearing portion 31, and along the first direction X, the projection of the first extension section 331 overlaps with the projection of the bearing portion 31, and the second extension section 332 is connected to the first extension section 331 and extends in a direction away from the top seal portion 221, and the second extension section 332 is provided with a connector 43 electrically connected to an external circuit.

[0094] Optionally, when viewed along the first direction X, the second extension section 332 extends along the second direction Z.

[0095] Please also read Figure 1 and Figure 3 In some embodiments, the first extension segment 331 includes a first sub-segment 331A and a second sub-segment 331B connected to the first sub-segment 331A, the first sub-segment 331A is connected to the bearing portion 31, and the second sub-segment 331B is connected to the second extension segment 332. Along the first direction X, the first sub-segment 331A overlaps with the second portion 252, and the second sub-segment 331B overlaps with the second side wall 24, so as to extend the first extension segment 331 so that the first extension segment 331 can provide a margin of movement for the second extension segment 332, thereby improving the reliability of the electrical connection between the connector 43 and the external circuit.

[0096] In some embodiments, when viewed along the first direction X, the first extension section 331 does not exceed the connecting portion 32 in the second direction Z, so as to reduce the space occupied by the circuit board assembly 2 in the second direction Z, which is beneficial to improving the energy density of the battery 100A.

[0097] In some embodiments, the first sub-segment 331A is bent at one end away from the second sub-segment 331B and connected to the side of the supporting portion 31 away from the first wall 2121, so that a space for accommodating the first protection device 42 is formed between the first sub-segment 331A and the supporting portion 31. Along the first direction X, the first protection device 42 is located between the first sub-segment 331A and the supporting portion 31, thereby reducing the risk of interference between the first sub-segment 331A and the first protection device 42.

[0098] In some embodiments, the substrate 30 is a flexible printed circuit (FPC), which is a printed circuit made of a flexible insulating substrate.

[0099] In some embodiments, the carrying portion 31 , the connecting portion 32 and the first extending portion 33 are integrally provided to improve the structural stability of the substrate 30 .

[0100] See also Figure 5 It should be noted that Figure 5The top seal 221 and the side seal 222 are in an unfolded state. In some embodiments, the electrode assembly 10 includes a pole piece group 11 and an inner pole ear 12. The pole piece group 11 includes a positive pole piece, a separator and a negative pole piece arranged in sequence. Optionally, the positive pole piece, the separator and the negative pole piece are a laminated structure. A first concave surface 111 is provided at a portion of the pole piece group 11 adjacent to the first concave wall 212, and the inner pole ear 12 extends from the first concave surface 111. The inner pole ear 12 is connected to the transfer pole ear 3 and forms a joint 121 so that the transfer pole ear 3 is electrically connected to the electrode assembly 10. The joint 121 is located between the first concave surface 111 and the first concave wall 212, so that the joint 121 and the pole piece group 11 share the space in the second direction Z, which is beneficial to improve the energy density of the battery 100A.

[0101] In some embodiments, the first concave wall 212, the first concave surface 111 and the second side wall 24 are enclosed together to form a space for accommodating the joint 121. Along the first direction X, the portion where the second side wall 24 overlaps with the joint 121 and the inner pole ear 12 is a suspended side wall, and the portion where the second side wall 24 overlaps with the pole piece group 11 is a body side wall. Since the suspended side wall corresponds to the space for accommodating the joint 121 and is hollow inside, the suspended side wall may present an irregular concave and convex surface due to a collision, and the body side wall overlaps with the pole piece group 11, so the body side wall is generally in a regular plane shape. In some embodiments, the suspended side wall may also be in a regular plane shape like the body side wall.

[0102] Optionally, the joint portion 121 is a weld mark formed by welding the inner electrode tab 12 and the transition electrode tab 3 .

[0103] Please continue reading Figure 5 In some embodiments, the first concave surface 111 includes a first surface 111A, a second surface 111B, and a third surface 111C. The first surface 111A and the first wall 2121 are arranged along the third direction Y, the second surface 111B and the second wall 2122 are arranged along the third direction Y, and the third surface 111C and the third wall 2123 are arranged along the second direction Z. The inner tab 12 extends from one of the first surface 111A, the second surface 111B, and the third surface 111C. A space for accommodating the coupling portion 121 is formed between the third surface 111C and the third wall 2123.

[0104] In some embodiments, when viewed along the third direction Y, the coupling portion 121 is obliquely disposed between the third surface 111C and the third wall 2123 to reduce stress on the coupling portion 121 due to excessive bending.

[0105] In some embodiments, when viewed along the first direction X, a portion of the first surface 111A close to the third surface 111C protrudes toward the joint portion 121 to increase the capacity of the electrode assembly 11 .

[0106] Please also read Figure 1 and Figure 6 In some embodiments, the battery 100A further includes a second insulating member 52, which is bonded to both sides of the top seal portion 25 in the thickness direction and to the exposed metal section, as well as to both sides of the portion where the side seal portion 26 is connected to the top seal portion 25 in the thickness direction and to the exposed metal section, so as to improve the insulation stability of the circuit board assembly 2 and the packaging bag 20.

[0107] In some embodiments, the battery 100A also includes a third insulating member 53, which is bonded to the surface of the connecting portion 32 facing away from the top sealing portion 25. The third insulating member 53 is also bonded to the two second side walls 24 and covers the first recessed wall 212 in the first direction X to improve the insulation stability of the circuit board assembly 2 and the packaging bag 20.

[0108] In some embodiments, when viewed along the first direction X, a gap is provided at the portion where the third insulating member 53 covers the first recessed wall 212 , and the first extension portion 33 extends from the gap to facilitate electrical connection between the first extension portion 33 and an external circuit outside the top sealing portion 25 .

[0109] Example 2 See also Figure 7 One embodiment of the present application further provides a battery 100B. The difference between the battery 100B and the battery 100A lies in the different structure of the first extension portion 33 .

[0110] The first extension portion 33 includes a first extension section 331 and a second extension section 332. The first extension section 331 is connected to the load-bearing portion 31, and the second extension section 332 is connected to the first extension section 331 and extends in a direction away from the top seal portion 221. The second extension section 332 is provided with a connector 43 electrically connected to an external circuit. Along the first direction X, the first extension portion 33 overlaps with the second portion 252. When viewed along the first direction X, the first extension portion 33 is separated from the second side wall 24 to reduce the risk of interference between the first extension portion 33 and the second side wall 24.

[0111] In some embodiments, one end of the first extension section 331 is bent and connected to a side of the supporting portion 31 away from the first wall 2121, so that a space for accommodating the first protection device 42 is formed between the first extension section 331 and the supporting portion 31. Along the first direction X, the first protection device 42 is located between the first extension section 331 and the supporting portion 31, thereby reducing the risk of interference between the first extension section 331 and the first protection device 42.

[0112] In some embodiments, both of the two bearing portions 31 are provided with a first extending portion 33 to improve the current flow performance of the circuit board assembly 2 .

[0113] 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.

[0114] Example 3 See also Figure 8 One embodiment of the present application further provides a battery 100C. The battery 100C is different from the battery 100A in that the structure of the first extension portion 33 is different.

[0115] The first extension portion 33 extends from the bearing portion 31 along the third direction Y in a direction away from the first side wall 23 so that the circuit board assembly 2 is electrically connected to an external circuit outside the first side wall 23 through the first extension portion 33. The external circuit can be but is not limited to a mainboard of a terminal device powered by a battery 100C.

[0116] In some embodiments, the first extension portion 33 includes a first extension section 331 and a second extension section 332. The first extension section 331 is connected to the carrier portion 31, and the second extension section 332 is connected to the first extension section 331 and extends in a direction away from the first side wall 23. The second extension section 332 is provided with a connector 43 electrically connected to an external circuit.

[0117] Optionally, when viewed along the first direction X, the second extension section 332 extends along the third direction Y. In some embodiments, the first extension section 331 includes a first subsection 331A, a second subsection 331B, and a third subsection 331C. The first subsection 331A is connected to the bearing portion 31, and the first subsection 331A and the second wall 2122 are arranged along the third direction Y. The second subsection 331B is connected to the first subsection 331A, and the second subsection 331B and the second side wall 24 are arranged along the first direction X. The third subsection 331C is connected to the second subsection 331B, and the third subsection 331C and the first side wall 23 are arranged along the third direction Y. The second extension section 332 is connected to the third subsection 331C.

[0118] Except for the above differences, the parameters of the battery 100C and the battery 100A are substantially the same, and reference may be made to the description of the above battery 100A.

[0119] Example 4 See also Fig. 9 One embodiment of the present application further provides a battery 100D. The difference between the battery 100D and the battery 100A is that the first extension portion 33 is provided with an electronic device.

[0120] The circuit board assembly 2 includes a second protection device 44. The substrate 30 includes a first extension portion 33, and the first extension portion 33 extends from the bearing portion 31 along the second direction Z in a direction away from the bottom wall 22, so that the circuit board assembly 2 is electrically connected to the external circuit outside the top seal portion 25 through the first extension portion 33. The external circuit can be, but is not limited to, a mainboard of a terminal device that uses a battery 100D to power it. The second protection device 44 is provided on the first extension portion 33, and when viewed along the first direction X, the second protection device 44 is separated from the battery cell 1, and the second protection device 44 is configured to form a protection circuit for protecting the battery cell 1. When the first extension portion 33 is located in the mainboard compartment of the terminal device and connected to the mainboard of the terminal device, the second protection device 44 can utilize the space in the mainboard compartment of the terminal device to reduce the space occupied by the protection device at the head of the battery 100D, which is conducive to improving the energy density of the battery 100D.

[0121] In some embodiments, the second protection device 44 is a SIP module. The first extension portion 33 protrudes out of the top seal portion 25 and is provided with a first area 33A and a second area 33B. The first area 33A is arranged in a similar manner to the second protection device 44, and the second protection device 44 is arranged in the first area 33A. The second area 33B is located on the side of the first area 33A away from the battery cell 1, and the second area 33B is provided with a connector 43 electrically connected to an external circuit.

[0122] It can be understood that in some embodiments, the second protection device 44 includes an electronic device and an injection molded body, the electronic device is directly welded to the first extension portion 33, and the injection molded body covers the electronic device and the portion of the first extension portion 33 where the electronic device is provided to protect the electronic device.

[0123] In some embodiments, the first protection device 42 and the second protection device 44 are defined according to the size of the electronic device, the carrying portion 31 is provided with the first protection device 42 , and the first extending portion 33 is provided with the second protection device 44 .

[0124] In some embodiments, the distance between the surface of the supporting portion 31 away from the second portion 252 and the corresponding second side wall 24 in the first direction X is used as a preset threshold, and the electronic device with a height greater than the preset threshold is provided on the first extension portion 33 as the second protection device 44, and the electronic device with a height less than or equal to the preset threshold is provided on the supporting portion 31 as the first protection device 42, so as to meet the protection circuit requirements while reducing the space waste caused by the electronic device protruding out of the first accommodating space 20C in the first direction X, which is beneficial to reducing the thickness of the battery 100D and improving the energy density of the battery 100D.

[0125] Please continue reading Fig. 9 In some embodiments, the bearing portion 31 is not provided with the first protection device 42 , and the first extending portion 33 is provided with the second protection device 44 .

[0126] In some embodiments, the circuit board assembly 2 further includes a first reinforcing plate 45, which is disposed on both sides of the bearing portion 31 opposite to the connecting member 41 along the first direction X. The first reinforcing plate 45 is used to improve the structural strength of the bearing portion 31, thereby improving the stability of the connection between the bearing portion 31 and the connecting member 41.

[0127] Except for the above differences, the parameters of the battery 100D are substantially the same as those of the battery 100A, and reference may be made to the description of the battery 100A.

[0128] Example 5 See also Fig.10 One embodiment of the present application further provides a battery 100E. The battery 100E is different from the battery 100A in that the structure of one of the second side walls 24 is different.

[0129] One of the second side walls 24 includes a second body wall 241, a second sinking wall 242 and a connecting wall 243. Observed along the first direction X, the connecting wall 243 is spaced apart from the first body wall 211 along the second direction Z. The second sinking wall 242 is connected to the first body wall 211 on one side of the second direction Z, the second sinking wall 242 is connected to the connecting wall 243 on one side of the first direction X on the other side of the second direction Z, the connecting wall 243 is connected to the second body wall 241 on the other side of the first direction X, and the second sinking wall 242 and the connecting wall 243 form a second accommodating space 20D. The second accommodating space 20D is connected to the two first accommodating spaces 20C along the third direction Y.

[0130] In some embodiments, the connection portion 32 is located along the second direction Z on a side of the first portion 251 away from the first body wall 211 .

[0131] In some embodiments, at least a portion of the first extension portion 33 is located in the second accommodating space 20D, the first extension portion 33 and the second sinking wall 242 share the space in the second direction Z, and the first extension portion 33 and the connecting wall 243 share the space in the first direction X, so as to reduce the space occupied by the circuit board assembly 2 in the first direction X and the second direction Z, which is beneficial to improve the energy density of the battery 100E.

[0132] In some embodiments, the first extension portion 33 includes a first extension section 331 and a second extension section 332. The first extension section 331 is connected to the bearing portion 31, and the first extension section 331 extends from the first accommodating space 20C into the second accommodating space 20D. The second extension section 332 is connected to the first extension section 331 and extends in a direction away from the top sealing portion 221. The second extension section 332 is provided with a connector 43 electrically connected to an external circuit.

[0133] In some embodiments, the first extension section 331 includes a first sub-section 331A and a second sub-section 331B connected to the first sub-section 331A, the first sub-section 331A is connected to the bearing portion 31, and the second sub-section 331B is connected to the second extension section 332. Along the first direction X, the first sub-section 331A overlaps with the second portion 252, and the second sub-section 331B overlaps with the second sinking wall 242, so as to extend the first extension section 331 so that the first extension section 331 can provide a movable margin for the second extension section 332, thereby improving the reliability of the electrical connection between the connector 43 and the external circuit.

[0134] Please also read Fig.10 and Fig.11 In some embodiments, the electrode assembly 10 includes an electrode body portion 10A and an electrode thinning portion 10B. Along the first direction X, the thickness of the electrode body portion 10A is T1, and the thickness of the electrode thinning portion 10B is T2, 0.1mm≤T1-T2≤0.5mm. Along the first direction X, the electrode body portion 10A overlaps with the second body wall 241, and the electrode thinning portion 10B overlaps with the second sinking wall 242, so as to improve the space utilization of the electrode assembly 10 in the main body portion 20A, which is beneficial to improving the capacity of the battery 100E.

[0135] Optionally, T1-T2 is one of 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm and any other value in the range of 0.1 mm≤L2≤0.5 mm.

[0136] In some embodiments, the electrode assembly 10 is a laminated structure, and the number of electrode layers in the electrode body portion 10A is greater than the number of electrode layers in the electrode thinning portion 10B.

[0137] Except for the above differences, the parameters of the battery 100E and the battery 100A are substantially the same, and reference may be made to the description of the above battery 100A.

[0138] Example 6 See also Fig.12 One embodiment of the present application further provides a battery 100F. The difference between the battery 100F and the battery 100E is that the position of the connecting portion 32 is different.

[0139] At least a portion of the connecting portion 32 is disposed in the second accommodating space 20D, the connecting portion 32 and the second sinking wall 242 share the space in the second direction Z, and the connecting portion 32 and the connecting wall 243 share the space in the first direction X, so as to reduce the space occupied by the circuit board assembly 2 in the first direction X and the second direction Z, which is beneficial to improve the energy density of the battery 100F.

[0140] In some embodiments, a thickness direction of the connection portion 32 is parallel to the first direction X, and along the first direction X, the connection portion 32 overlaps with the second sinking wall 242 .

[0141] In some embodiments, the battery 100F includes a first insulating member 51, and along the second direction Z, the first insulating member 51 is bonded between the connecting portion 32 and the second sinking wall 242 to improve the insulation stability of the circuit board assembly 2 and the packaging bag 20, and to improve the stability of the circuit board assembly 2 at the head of the battery 100F.

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

[0143] Example 7 See also Fig.13 One embodiment of the present application further provides a battery 100G. The battery 100G is different from the battery 100A in that the position of the first concave wall 212 is different.

[0144] The two first concave walls 212 are connected to each other, and the two first accommodating spaces 20C are connected to each other, so as to shorten the length of the connecting portion 32 in the third direction Y and reduce the production cost of the circuit board assembly 2. The first body wall 211 includes two first sub-walls 211A arranged on both sides of the two first concave walls 212 along the third direction Y, and the first portion 251 includes two first sub-portions 251A, each of which is connected to a first sub-wall 211A. The second portion 252 connects the two first sub-portions 251A to improve the packaging stability of the top seal portion 25.

[0145] In some embodiments, the connection portion 32 is disposed in the two first accommodating spaces 20C and connected between the two bearing portions 31, and each bearing portion 31 is provided with a first protective device 42. The connection portion 32 and the two first concave walls 212 share the space in the first direction X and the second direction Z, so as to reduce the space occupied by the circuit board assembly 2 in the first direction X and the second direction Z, which is beneficial to improve the energy density of the battery 100G.

[0146] In some embodiments, when viewed along the first direction X, the first sub-portion 251A is spaced apart from the side sealing portion 26 to reduce space waste caused by forming an angled structure at the corner of the packaging portion 20B located at the main body portion 20A, which is beneficial to improving the energy density of the battery 100G.

[0147] In some embodiments, the top wall 21 includes a first oblique wall 214, which is disposed between the first sub-wall 211A and the corresponding first side wall 23, and when viewed along the first direction X, the first oblique wall 214 is inclined relative to the first sub-wall 211A and the first side wall 23. The top sealing portion 25 includes a fourth portion 254, which connects the first oblique wall 214, the first sub-portion 251A and the side sealing portion 26, so as to reduce the risk of stress concentration at the corner of the packaging portion 20B located at the main body portion 20A, and is conducive to improving the packaging stability at the corner.

[0148] See also Fig.14 It should be noted that Fig.14 The top seal portion 221 and the side seal portion 222 are in an unfolded state. In some embodiments, the electrode assembly 10 includes a pole piece group 11 and an inner pole ear 12. The pole piece group 11 includes a positive pole piece, a separator and a negative pole piece arranged in sequence. A first concave surface 111 is provided at a portion of the pole piece group 11 adjacent to the two first concave walls 212, and the inner pole ear 12 extends from the first concave surface 111. The inner pole ear 12 is connected to the transition pole ear 3 and forms a joint 121 so that the transition pole ear 3 is electrically connected to the electrode assembly 10. The joint 121 is located between the first concave surface 111 and the two first concave walls 212, so that the joint 121 and the pole piece group 11 share the space in the second direction Z, which is beneficial to improve the energy density of the battery 100A.

[0149] Except for the above differences, the parameters of battery 100G and battery 100A are substantially the same, and reference may be made to the description of battery 100A above.

[0150] Example 8 See also Fig.15 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 concave wall 212 is different.

[0151] The two first concave walls 212 are connected to each other, and the two first accommodating spaces 20C are connected to each other, so as to shorten the length of the connecting portion 32 in the third direction Y and reduce the production cost of the circuit board assembly 2. One of the first concave walls 212 is connected to one of the first side walls 23, and the other first concave wall 212 is connected to the first body wall 211.

[0152] In some embodiments, when viewed along the first direction X, the first portion 251 is spaced apart from the first side wall 23 away from the two first recessed walls 212 to reduce space waste caused by forming an angled structure at the corner of the packaging portion 20B located at the main body portion 20A, thereby facilitating improving the energy density of the battery 100H.

[0153] In some embodiments, the top wall 21 includes a first oblique wall 214, which is disposed between the first body wall 211 and the first side wall 23 away from the two first concave walls 212, and the first oblique wall 214 is inclined relative to the first body wall 211 and the first side wall 23 when viewed along the first direction X. The top sealing portion 25 includes a fourth portion 254, which connects the first oblique wall 214, the first portion 251 and the side sealing portion 26, so as to reduce the risk of stress concentration at the corner of the packaging portion 20B located at the main body portion 20A, and is conducive to improving the packaging stability at the corner.

[0154] See also Fig.16 It should be noted that Fig.16 The top seal portion 221 and the side seal portion 222 are in an unfolded state. In some embodiments, the electrode assembly 10 includes a pole piece group 11 and an inner pole ear 12. The pole piece group 11 includes a positive pole piece, a separator and a negative pole piece arranged in sequence. A first concave surface 111 is provided at the corner adjacent to the pole piece group 11 and the two first concave walls 212, and the inner pole ear 12 extends from the first concave surface 111. The inner pole ear 12 is connected to the transition pole ear 3 and forms a joint 121 so that the transition pole ear 3 is electrically connected to the electrode assembly 10. The joint 121 is located between the first concave surface 111 and the two first concave walls 212, so that the joint 121 and the pole piece group 11 share the space in the second direction Z, which is beneficial to improve the energy density of the battery 100A.

[0155] 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 above.

[0156] Example 10 See also Fig.17 An embodiment of the present application further provides a terminal device 200A, comprising the battery (100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H) in any of the above embodiments.

[0157] 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.

[0158] In summary, in the above-mentioned batteries (100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H) and the terminal device 200A, the first recessed wall 212 is recessed relative to the first main body wall 211 along the second direction Z toward the bottom wall 212, the second portion 252 and the first recessed wall 212 form a first accommodating space 20C, and the bearing portion 31 is located in the first accommodating space 20C to reduce the space occupied by the circuit board assembly 2 at the head of the battery 100A, which is beneficial to improving the energy density of the battery (100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H).

[0159] Embodiment 11 See also Fig.18 An embodiment of the present application further provides a terminal device 200B, the terminal device 200B includes a mainboard 60, a third protection device 70 and a battery 100I.

[0160] The difference between the battery 100I and the battery 100A is that the first protection device 42 is not provided on the bearing portion 31. The battery 100I is electrically connected to the main board 60, and the third protection device 70 is provided on the main board 60. The third protection device 70 is configured to form a protection circuit for protecting the battery cell 1. The third protection device 70 can utilize the space in the main board compartment of the terminal device 200B to reduce the space occupied by the protection device at the head of the battery 100I, which is conducive to improving the energy density of the battery 100I.

[0161] In some embodiments, one end of the first extension portion 33 away from the bottom wall 22 is electrically connected to the main board 60 .

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

[0163] Example 12 See also Fig.19 An embodiment of the present application further provides a terminal device 200C, which includes a mainboard 60, a third protection device 70 and a battery 100J.

[0164] The difference between the battery 100J and the battery 100G is that the first protection device 42 is not provided on the bearing portion 31. The battery 100J is electrically connected to the mainboard 60, and the third protection device 70 is provided on the mainboard 60. The third protection device 70 is configured to form a protection circuit for protecting the battery cell 1. The third protection device 70 can utilize the space in the mainboard compartment of the terminal device 200C to reduce the space occupied by the protection device at the head of the battery 100J, which is conducive to improving the energy density of the battery 100J.

[0165] In some embodiments, one end of the first extension portion 33 away from the bottom wall 22 is electrically connected to the main board 60 .

[0166] Except for the above differences, the parameters of battery 100J and battery 100G are substantially the same, and reference may be made to the description of battery 100G above.

[0167] 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: Electrode assembly; A packaging bag, the packaging bag comprising a main body and a packaging part, the electrode assembly is arranged in the main body, the main body comprising a top wall and a bottom wall, the top wall and the bottom wall are arranged spaced apart along a second direction when viewed along a first direction, the first direction is a thickness direction of the battery cell, the first direction and the second direction are perpendicular to each other, the top wall comprises a first body wall and a first concave wall, the first concave wall is concave toward the bottom wall along the second direction relative to the first body wall, the packaging part comprises a top sealing part, the top sealing part comprises a first part and a second part, the first part is connected to the first body wall, the second part is connected to the first concave wall and the first part, and the second part and the first concave wall form a first accommodating space; A circuit board assembly, the circuit board assembly comprising a substrate, the substrate comprising a bearing portion, and the bearing portion is located in the first accommodating space; A transfer tab, one end of which is electrically connected to the electrode assembly, and the other end of which extends from the second portion and is electrically connected to the bearing portion.

2. The battery according to claim 1, characterized in that The first portion is bent toward the first main body wall, the second portion extends along the second direction, the second portion includes a first side edge away from the bottom wall along the second direction, the adapter tab extends from the first side edge, and when viewed along the first direction, a height difference between the first side edge and the first portion on the second side is L1, 0mm≤L1≤0.5mm.

3. The battery according to claim 2, characterized in that The first side is provided with a first notch, and a portion of the transfer tab is located in the first notch.

4. The battery according to claim 1, characterized in that The circuit board assembly includes a first protection device, which is disposed on the carrying portion and located in the first accommodating space.

5. The battery according to claim 1, characterized in that The circuit board assembly includes a second protection device, the substrate includes a first extension portion, the first extension portion extends from the bearing portion along the second direction toward a direction away from the bottom wall, the second protection device is arranged on the first extension portion, and when observed along the first direction, the second protection device is separated from the battery cell.

6. The battery according to claim 1, characterized in that The main body comprises two first side walls and two second side walls arranged between the top wall and the bottom wall, the two first side walls are arranged at intervals along the third direction, the two second side walls are arranged at intervals along the first direction, and the first direction, the second direction and the third direction are perpendicular to each other; The top wall includes two first concave walls arranged along the third direction, the top sealing portion includes two second portions, each of the second portions connects one of the first concave walls and the first portion, and the battery includes two adapter tabs, each of the adapter tabs extends from one of the second portions; The substrate includes two carrying parts, each of which is located in one of the first accommodating spaces and connected to one of the transfer tabs.

7. The battery according to claim 6, characterized in that The packaging portion includes a side sealing portion, and the side sealing portion is connected to the first side wall; The top wall includes two first sinking walls, each of which is disposed between one of the first concave walls and a corresponding first side wall, and along the second direction, a distance between the first body wall and the bottom wall is D1, a distance between the first sinking wall and the bottom wall is D2, and 1 mm ≤ D1-D2 ≤ 3 mm; The top sealing portion includes a third portion, the third portion extends along the second direction, and the third portion connects the first sinking wall, the second portion, and the side sealing portion.

8. The battery according to claim 7, characterized in that The base plate includes a connecting portion, the connecting portion is located along the second direction on a side of the first portion away from the first body wall, and the carrying portion extends from the connecting portion along the second direction toward the first accommodating space; A height difference between the side of the third portion away from the bottom wall and the connecting portion in the second direction is L2, 0mm≤L2≤0.5mm.

9. The battery according to claim 7, characterized in that One of the second side walls includes a second main body wall, a second sunken wall and a connecting wall. When viewed along the first direction, the connecting wall is spaced apart from the first main body wall along the second direction. The second sunken wall is connected to the first main body wall on one side in the second direction, the second sunken wall is connected to the connecting wall on one side in the first direction on the other side in the second direction, and the connecting wall is connected to the second main body wall on the other side in the first direction. The second sunken wall and the connecting wall form a second accommodating space, and the second accommodating space is connected to the two first accommodating spaces along the third direction. The base plate comprises a connecting portion and a first extending portion, the connecting portion connects the two bearing portions, the bearing portion extends from the connecting portion toward the first accommodating space, and the first extending portion extends from the bearing portion along the second direction toward a direction away from the bottom wall; At least a portion of the connecting portion and / or the first extending portion is located in the second accommodating space.

10. The battery according to claim 9, characterized in that The electrode assembly comprises an electrode body portion and an electrode thinning portion, along the first direction, the thickness of the electrode body portion is T1, the thickness of the electrode thinning portion is T2, 0.1 mm ≤ T1-T2 ≤ 0.5 mm; Along the first direction, the electrode body portion overlaps with the second body wall, and the electrode thinning portion overlaps with the second sinking wall.

11. The battery according to claim 6, characterized in that The packaging portion includes a side sealing portion, and the side sealing portion is connected to the first side wall; The two first recessed walls are connected to each other, the two first accommodating spaces are connected to each other, the first main body wall includes two first sub-walls arranged on both sides of the two first recessed walls along the third direction, the first part includes two first sub-parts, each first sub-part is connected to one first sub-wall, and the second part connects the two first sub-parts.

12. The battery according to claim 11, characterized in that When viewed along the first direction, the first sub-portion is spaced apart from the side sealing portion.

13. The battery according to claim 12, characterized in that The top wall includes a first inclined wall, the first inclined wall is arranged between the first sub-wall and the corresponding first side wall, and when viewed along the first direction, the first inclined wall is inclined relative to the first sub-wall and the first side wall; The top sealing portion includes a fourth portion, and the fourth portion connects the first inclined wall, the first sub-portion and the side sealing portion.

14. The battery according to claim 6, characterized in that The packaging portion includes a side sealing portion, and the side sealing portion is connected to the first side wall; The two first concave walls are connected to each other, the two first accommodating spaces are connected to each other, one of the first concave walls is connected to one of the first side walls, and the other of the first concave walls is connected to the first body wall.

15. The battery according to claim 14, characterized in that When viewed along the first direction, the first portion is spaced apart from the first side wall away from the two first concave walls.

16. The battery according to claim 15, characterized in that The top wall includes a first inclined wall, the first inclined wall is arranged between the first body wall and the first side wall away from the two first concave walls, and when viewed along the second direction, the first inclined wall is inclined relative to the first body wall and the first side wall; The top sealing portion includes a fourth portion connecting the first inclined wall, the first portion and the side sealing portion.

17. The battery according to claim 1, characterized in that The electrode assembly includes a pole piece group and an inner pole ear. A first concave surface is provided at a portion of the pole piece group adjacent to the first concave wall. The inner pole ear extends from the first concave surface. The inner pole ear is connected to the transfer pole ear to form a joint portion, and the joint portion is located between the first concave surface and the first concave wall.

18. A terminal device, characterized in that: Comprising a battery as claimed in any one of claims 1 to 17.

19. A terminal device, characterized in that: It comprises a main board, a third protection device and the battery as claimed in claim 1, wherein the battery is electrically connected to the main board, and the third protection device is arranged on the main board.

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