Battery and terminal apparatus

Abstract

A battery and a terminal apparatus. The battery comprises a battery cell, a circuit board assembly, and adapter tabs. The battery cell comprises an electrode assembly and a packaging pouch, wherein the packaging pouch comprises a main body portion and a sealing portion, and the electrode assembly is disposed in the main body portion. The main body portion comprises a top wall and a bottom wall, and when viewed in a first direction, the top wall and the bottom wall are spaced apart from each other in a second direction. The top wall comprises a first body wall and a first recessed wall, and the first recessed wall is recessed towards the bottom wall in a second direction relative to the first body wall. The sealing portion comprises a top sealing portion, and the top sealing portion comprises a first portion and a second portion, wherein the first portion is connected to the first body wall, the second portion is connected to the first recessed wall and the first portion, and the second portion and the first recessed wall form a first accommodating space. The circuit board assembly comprises a substrate, the substrate comprises a bearing portion, and the bearing portion is located in the first accommodating space. One end of each adapter tab is electrically connected to the electrode assembly, and the other end of each adapter tab extends from the second portion and is electrically connected to the bearing portion. The battery is beneficial for improving the energy density.

Description

Battery and terminal device

[0001] This application claims priority to Chinese Patent Application No. 202510113626.1, filed on January 23, 2025, entitled "Battery and Terminal Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of energy storage technology, and in particular to a battery and terminal device. Background Technology

[0003] In existing battery structures, the substrate and electronic components connected to the substrate are typically located on the top wall of the cell. These electronic components occupy a significant amount of space, which is detrimental to improving the battery's energy density. Summary of the Invention

[0004] In view of the above, this application provides a battery that is beneficial to improving energy density.

[0005] This application provides a battery, which includes a battery cell, a circuit board assembly, and an adapter tab. The battery cell includes an electrode assembly and a packaging bag. The packaging bag includes a main body and a sealing portion. The electrode assembly is disposed within the main body. The main body includes a top wall and a bottom wall, which are spaced apart along a second direction when viewed in a first direction. The first direction is the thickness direction of the battery cell, and the first and second directions are perpendicular to each other. The top wall includes a first body wall and a first recessed wall, the first recessed wall being recessed relative to the first body wall towards the bottom wall along the second direction. The sealing portion includes a top sealing portion, which includes a first part and a second part. The first part is connected to the first body wall, and the second part is connected to the first recessed wall and the first part, and the second part and the first recessed wall form a first accommodating space. The circuit board assembly includes a substrate, the substrate including a carrier portion, the carrier portion being located in the first accommodating space. One end of the adapter tab is electrically connected to the electrode assembly, and the other end of the adapter tab extends from the second part and is electrically connected to the carrier portion.

[0006] In the aforementioned battery, the first concave wall is recessed towards the bottom wall in a second direction relative to the first body wall, and the second part and the first concave wall form a first accommodating space. The supporting 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.

[0007] In some embodiments of this application, the first part bends towards the first body wall to reduce the space occupied by the top seal at the head of the battery, which is beneficial to improving the energy density of the battery. The second part extends along a second direction and includes a first side away from the bottom wall along the second direction. The adapter tab extends from the first side to facilitate electrical connection to the carrier. Viewed along the first direction, the height difference between the first side and the first part in the second direction is L1, 0mm≤L1≤0.5mm, to limit the space occupied by the first side and the first part at the head of the battery, which is beneficial to improving the energy density of the battery. Furthermore, L1 can also serve as a tolerance to facilitate battery production.

[0008] In some embodiments of this application, a first notch is provided on the first side, and the portion of the adapter tab is located in the first notch, so as to reduce the space occupied by the adapter tab at the head of the battery and improve the energy density of the battery.

[0009] In some embodiments of this application, the circuit board assembly includes a first protective device disposed on a support portion and located within a first accommodating space. The first protective device is configured to form a protective circuit for the battery cell. The support portion and the first protective device are located within the first accommodating space to reduce space waste caused by placing the protective device at the head of the battery, thereby increasing the battery's energy density. Furthermore, the first protective device can support the support portion, improving its structural strength and thus enhancing the stability of the connection between the support portion and the adapter tab.

[0010] In some embodiments of this application, the circuit board assembly includes a second protective device. The substrate includes a first extension extending from the support portion in a second direction away from the bottom wall, and the second protective device is disposed on the first extension. Viewed along the first direction, the second protective device is separate from the battery cell. The second protective device is configured to form a protective circuit for the battery cell. When the first extension is located in the motherboard compartment of the terminal device and connected to the motherboard of the terminal device, the second protective device can utilize the space in the motherboard compartment of the terminal device to reduce the space occupied by the protective device at the head of the battery, which is beneficial to improving the energy density of the battery.

[0011] In some embodiments of this application, the main body includes two first sidewalls and two second sidewalls disposed between a top wall and a bottom wall. The two first sidewalls are spaced apart along a third direction, and the two second sidewalls are spaced apart along a first direction. The first direction, the second direction, and the third direction are perpendicular to each other. The top wall includes two first recessed walls arranged along a third direction, and the top sealing portion includes two second portions, each second portion connecting a first recessed wall and a first portion. The battery includes two adapter tabs, each adapter tab extending from a second portion. The substrate includes two support portions, each support portion located in a first accommodating space and connected to an adapter tab. The electrode assembly forms a complete current loop with the circuit board assembly through two adapter tabs of different polarities.

[0012] In some embodiments of this application, the encapsulation portion includes a side seal portion connected to a first sidewall. The top wall includes two first recessed walls, each first recessed wall being disposed between a first recessed wall and a corresponding first sidewall. Along the second direction, the distance between the first body wall and the bottom wall is D1, and the distance between the first recessed wall and the bottom wall is D2, where 1mm ≤ D1 - D2 ≤ 3mm, so that the corner positions of the main body portion located at both ends of the top wall form a space to accommodate the encapsulation portion, reducing the space occupied by the encapsulation portion at the corner positions in the head of the battery, which is beneficial to improving the energy density of the battery. The top seal portion includes a third portion extending along the second direction, and the third portion connecting the first recessed wall, the second portion, and the side seal portion to improve the stability of the encapsulation.

[0013] In some embodiments of this application, the substrate includes a connecting portion located along a second direction on the side of the first portion away from the first body wall. A supporting portion extends from the connecting portion along the second direction toward the first accommodating space. The connecting portion connects two supporting portions to electrically connect two adapter tabs of different polarities, forming 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, where 0mm ≤ L2 ≤ 0.5mm, to limit the space occupied by the third portion at the head of the battery, which is beneficial for improving the energy density of the battery. Furthermore, L2 can also serve as a tolerance allowance to facilitate battery production.

[0014] In some embodiments of this application, one of the second sidewalls includes a second body wall, a second recessed wall, and a connecting wall. Viewed along a first direction, the connecting wall and the first body wall are spaced apart along a second direction. The second recessed wall connects to the first body wall on one side in the second direction, and the second recessed wall connects to the connecting wall on one side in the first direction on the other side in the second direction. The connecting wall connects to the second body wall on the other side in the first direction. The second recessed wall and the connecting wall form a second accommodating space, which connects two first accommodating spaces along a third direction. The substrate includes a connecting portion and a first extension portion. The connecting portion connects two support portions, which extend from the connecting portion toward the first accommodating space. The first extension portion extends from the support portion in the second direction away from the bottom wall. At least a portion of the first extension portion is located in the second accommodating space. The first extension portion shares space in the second direction with the second recessed wall, and shares space in the first direction with the connecting wall, thereby reducing the space occupied by the circuit board assembly in both the first and second directions, which is beneficial for improving the energy density of the battery.

[0015] In some embodiments of this application, one of the second sidewalls includes a second body wall, a second recessed wall, and a connecting wall. Viewed along a first direction, the connecting wall and the first body wall are spaced apart along a second direction. The second recessed wall connects to the first body wall on one side in the second direction, and the second recessed wall connects to the connecting wall on one side in the first direction on the other side in the second direction. The connecting wall connects to the second body wall on the other side in the first direction. The second recessed wall and the connecting wall form a second accommodating space, which connects two first accommodating spaces along a third direction. The substrate includes a connecting portion and a first extension portion. The connecting portion connects two support portions, which extend from the connecting portion toward the first accommodating space. The first extension portion extends from the support portion along the second direction away from the bottom wall. At least a portion of the connecting portion is located in the second accommodating space. The connecting portion shares space in the second direction with the second recessed wall, and the connecting portion shares space in the first direction with the connecting wall, thereby reducing the space occupied by the circuit board assembly in both the first and second directions, which is beneficial for improving the energy density of the battery.

[0016] In some embodiments of this application, the electrode assembly includes an electrode body portion and an electrode thinning portion. Along a first direction, the thickness of the electrode body portion is T1, and the thickness of the electrode thinning portion is T2, where 0.1 mm ≤ T1 - T2 ≤ 0.5 mm. Along the first direction, the electrode body portion overlaps with a second body wall, and the electrode thinning portion overlaps with a second recessed wall, thereby improving the space utilization rate of the electrode assembly within the body portion and facilitating an increase in battery capacity.

[0017] In some embodiments of this application, the encapsulation portion includes a side seal portion connected to a first sidewall. Two first recessed walls are interconnected, and two first accommodating spaces are interconnected, thereby shortening the length of the connection portion in the third direction and reducing the production cost of the circuit board assembly. The first body wall includes two first sub-walls disposed 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 connecting to a first sub-wall, and the second part connecting the two first sub-parts to improve the encapsulation stability of the top seal portion.

[0018] In some embodiments of this application, when viewed along the first direction, the first sub-part and the side sealing part are spaced apart to reduce the space waste caused by the corner structure formed at the corner of the main body part of the encapsulation part, which is conducive to improving the energy density of the battery.

[0019] In some embodiments of this application, the top wall includes a first inclined wall disposed between the first sub-wall and the corresponding first side wall. Viewed along a first direction, the first inclined wall is inclined relative to the first sub-wall and the first side wall. The top seal includes a fourth portion connecting the first inclined wall, the first sub-wall, and the side seal, thereby reducing the risk of stress concentration at the corner of the encapsulation portion of the main body and improving the encapsulation stability at the corner.

[0020] In some embodiments of this application, the encapsulation portion includes a side seal portion connected to a first sidewall. Two first recessed walls are interconnected, and two first accommodating spaces are interconnected, in order to shorten the length of the connection portion in the third direction and reduce the production cost of the circuit board assembly. One of the first recessed walls is connected to one of the first sidewalls, and the other first recessed wall is connected to the first body wall.

[0021] In some embodiments of this application, when viewed along a first direction, the first part is spaced apart from the first sidewalls that are away from the two first concave walls, so as to reduce the space waste caused by the corner structure formed at the corner of the main body part of the encapsulation part, which is conducive to improving the energy density of the battery.

[0022] In some embodiments of this application, the top wall includes a first inclined wall disposed between the first body wall and a first side wall away from the two first recessed walls. Viewed along a second direction, the first inclined wall is inclined relative to the first body wall and the first side wall. The top seal includes a fourth portion that connects the first inclined wall, the first portion, and the side seal, thereby reducing the risk of stress concentration at the corner of the encapsulation portion and improving the encapsulation stability at the corner.

[0023] In some embodiments of this application, the electrode assembly includes an electrode group and an inner tab. The portion of the electrode group adjacent to the first concave wall has a first concave surface. The inner tab extends from the first concave surface and connects to an adapter tab to form a joint. The joint is located between the first concave surface and the first concave wall, so that the joint and the electrode group share space in the second direction, which is beneficial for improving the energy density of the battery.

[0024] Embodiments of this application also provide a terminal device, which includes any of the batteries described in the above embodiments.

[0025] Embodiments of this application also provide a terminal device, which includes a motherboard, a third protection device, and a battery. The battery is electrically connected to the motherboard, and the third protection device is disposed on the motherboard. The battery includes a cell, a circuit board assembly, and an adapter tab. The cell includes an electrode assembly and a packaging bag. The packaging bag includes a main body and a sealing portion. The electrode assembly is disposed within the main body. The main body includes a top wall and a bottom wall, which are spaced apart along a second direction when viewed along a first direction. The first direction is the thickness direction of the cell, and the first and second directions are perpendicular to each other. The top wall includes a first body wall and a first concave wall, the first concave wall being recessed relative to the first body wall towards the bottom wall along the second direction. The sealing portion includes a top sealing portion, which includes a first part and a second part. The first part is connected to the first body wall, and 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. The circuit board assembly includes a substrate, the substrate including a support portion, the support portion being located in the first accommodating space. One end of the adapter tab is electrically connected to the electrode assembly, and the other end of the adapter tab extends from the second part and is electrically connected to the support portion. Attached Figure Description

[0026] Figure 1 is a schematic diagram of the front structure of the battery in a first direction in one embodiment of this application.

[0027] Figure 2 is a schematic diagram of the rear structure of the battery in a first direction in one embodiment of this application.

[0028] Figure 3 is a schematic diagram of the disassembled structure of the battery in Figure 1.

[0029] Figure 4 is a partial cross-sectional view of the battery in Figure 1 along section line AA.

[0030] Figure 5 is a schematic diagram of the electrode assembly of the battery in Figure 1.

[0031] Figure 6 is a schematic diagram of the structure of the second and third insulating components of the battery in one embodiment of this application.

[0032] Figure 7 is a schematic diagram of the battery structure in another embodiment of this application.

[0033] Figure 8 is a schematic diagram of the battery structure in another embodiment of this application.

[0034] Figure 9 is a schematic diagram of the battery structure in another embodiment of this application.

[0035] Figure 10 is a schematic diagram of the battery structure in another embodiment of this application.

[0036] Figure 11 is a schematic diagram of the electrode assembly of the battery in Figure 10.

[0037] Figure 12 is a schematic diagram of the battery structure in another embodiment of this application.

[0038] Figure 13 is a schematic diagram of the battery structure in another embodiment of this application.

[0039] Figure 14 is a schematic diagram of the electrode assembly of the battery in Figure 13.

[0040] Figure 15 is a schematic diagram of the battery structure in another embodiment of this application.

[0041] Figure 16 is a schematic diagram of the electrode assembly of the battery in Figure 15.

[0042] Figure 17 is a schematic diagram of the structure of a terminal device in one embodiment of this application.

[0043] Figure 18 is a schematic diagram of the structure of the terminal device in another embodiment of this application.

[0044] Figure 19 is a schematic diagram of the structure of the terminal device in another embodiment of this application.

[0045] Key Component Symbols: Battery 100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J; Terminal Device 200A, 200B, 200C; Cell 1; Electrode Assembly 10; Electrode Body 10A; Electrode Thinning Section 10B; Electrode Group 11; First Concave Surface 111; First Surface 111A; Second Surface 111B; Third Surface 111C; Inner Tab 12; Connecting Part 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; Third Wall 2123; First Sunken Wall 213; First Inclined Wall 214; Bottom Wall 22; First Side Wall 23; Second Side Wall 24; Second Body Wall 241; Second Sunken Wall 242; Connecting Wall 243; Encapsulation Part 20B Top sealing part 25 First part 251 First bending part 2511 Second bending part 2512 First sub-part 251A Second part 252 First side 2521 Notch 2522 Third part 253 Fourth part 254 Side sealing part 26 First accommodating space 20C Second accommodating space 20D Circuit board assembly 2 Substrate 30 Support part 31 Connecting part 32 First extension part 33 First extension section 331 First sub-section 331A Second sub-section 331B Third sub-section 331C Second extension section 332 First area 33A Second area 33B Connector 41 First connecting section 411 Second connecting section 412 Opening 413 First protective device 42 Connector 43 Second protective device 44 First reinforcing plate 45 First insulating part 51 Second insulating part 52 Third insulating part 53 Adapter tab 3 First section 301 Second section 302 Third section 303 Tab adhesive 304 Main board 60 Third protective device 70 First direction X Second direction Z, Third direction Y

[0046] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0048] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be components positioned in between. When a component is considered to be "set" on another component, it can be directly set on the other component or there may be components positioned in between. It should be understood that, considering the factors of actual machining tolerances, in the technical solution of this application, when two components are set parallel / perpendicularly, they are set in the same direction, and there may be a certain angle between the two components. The angle between the two components is allowed to have a tolerance of 0-±10%.

[0049] When one value is considered "equal" to another, it means that they are equal within a set deviation range, which is within 10%. In other words, if at least one of the two values ​​fluctuates within the set deviation range, they are considered approximately equal even if their values ​​are not equal. Similarly, when one value is considered to have a "1:1" ratio with another, it means that they are equal within a set deviation range, which is within 10%. Again, if at least one of the two values ​​fluctuates within the set deviation range, they are considered equal in ratio even if their values ​​are not equal.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. The term "overlap" as used herein refers to the overlapping of the projected portions of two components or the coincidence of the projected portions of two components.

[0051] One embodiment of this application provides a battery, which includes a battery cell, a circuit board assembly, and an adapter tab. The battery cell includes an electrode assembly and a packaging bag. The packaging bag includes a main body and a sealing portion. The electrode assembly is disposed within the main body. The main body includes a top wall and a bottom wall, which are spaced apart along a second direction when viewed in a first direction. The first direction is the thickness direction of the battery cell, and the first and second directions are perpendicular to each other. The top wall includes a first body wall and a first recessed wall, the first recessed wall being recessed relative to the first body wall towards the bottom wall along the second direction. The sealing portion includes a top seal portion, which includes a first part and a second part. The first part is connected to the first body wall, and the second part is connected to the first recessed wall and the first part, and the second part and the first recessed wall form a first accommodating space. The circuit board assembly includes a substrate, the substrate including a carrier portion, the carrier portion being located in the first accommodating space. One end of the adapter tab is electrically connected to the electrode assembly, and the other end of the adapter tab extends from the second part and is electrically connected to the carrier portion.

[0052] In the aforementioned battery, the first concave wall is recessed towards the bottom wall in a second direction relative to the first body wall, and the second part and the first concave wall form a first accommodating space. The supporting 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.

[0053] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0054] Example 1

[0055] Please refer to Figures 1 to 4 together. One embodiment of this application provides a battery 100A, which includes a cell 1, a circuit board assembly 2, and an adapter tab 3. The battery 100A may be, but is not limited to, a rechargeable battery, which is a battery that can be used again after being discharged by recharging to activate the active materials.

[0056] 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 an encapsulating 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.

[0057] The packaging bag 20 includes a main body 20A and a sealing part 20B. The main body 20A is a portion with perforations, and the sealing part 20B is a portion where the sealing films overlap and are joined. The electrode assembly 10 is disposed within the main body 20A.

[0058] Please refer to Figures 1 and 2 together. The 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 recessed relative to the first body wall 211 toward the bottom wall 22 along the second direction Z.

[0059] The encapsulation portion 20B includes a top seal portion 25, which is used to improve the encapsulation stability of the top wall 21. The top seal portion 25 includes a first portion 251 and a second portion 252. The first portion 251 is connected to the first body wall 211, and the second portion 221B is connected to the first recessed wall 212 and the first portion 251. The second portion 252 and the first recessed wall 212 form a first accommodating space 20C.

[0060] Please refer to Figures 1 and 3 together. The circuit board assembly 2 includes a substrate 30, and the substrate 30 includes a support portion 31, which is located in the first accommodating space 20C. One end of the adapter tab 3 is electrically connected to the electrode assembly 10, and the other end of the adapter tab 3 extends from the second part 252 and is electrically connected to the support portion 31.

[0061] In the aforementioned battery 100A, the first concave wall 212 is recessed relative to the first body wall 211 along the second direction Z toward the bottom wall 22. The second part 252 and the first concave wall 212 form a first accommodating space 20C. The supporting part 31 is located in the first accommodating space 20C, so as 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.

[0062] It should be noted that the head of battery 100A refers to the position of the first body wall 211 away from the bottom wall 22.

[0063] Please refer to Figures 1, 2, and 3 together. In some embodiments, the main body 20A includes two first sidewalls 23 and two second sidewalls 24 disposed between the top wall 21 and the bottom wall 22. The two first sidewalls 23 are spaced apart along a third direction Y, and the two second sidewalls 24 are spaced apart along a first direction X. The top wall 21 includes two first recessed walls 212 arranged along a third direction Y, and the two first recessed walls 212 are located at both ends of the first body wall 211 along the third direction Y. The top sealing portion 25 includes two second portions 252, each second portion 252 connecting a first recessed wall 212 and a first portion 251. The two second portions 252 and the two first recessed walls 212 form two first accommodating spaces 20C. The battery 100A includes two adapter tabs 3 with different polarities, and each adapter tab 3 extends from a second portion 252. The substrate 30 includes two carrier portions 31, each carrier portion 31 being located in a first accommodating space 20C and connected to an adapter tab 3. The electrode assembly 10 forms a complete current loop with the circuit board assembly 2 through the two adapter tabs 3 of different polarities.

[0064] Referring to Figures 1 and 3, in some embodiments, the first recessed 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 a 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 near the bottom wall 22, and the third wall 2123 extends along a third direction Y. 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.

[0065] In some embodiments, along the third direction Y, the first concave wall 212 and the corresponding first side wall 23 are spaced apart, that is, the second wall 2122 and the corresponding first side wall 23 are spaced apart, so that the adapter 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 that the packaging stability at the corners will be reduced due to the adapter tab 3 being close to the corners.

[0066] Please refer to Figures 1 and 3 together. In some embodiments, the first part 251 is bent toward the first body wall 211 to reduce the space occupied by the top seal 25 at the head of the battery 100A, which is beneficial to improving the energy density of the battery 100A. The second part 252 extends along the second direction Z and includes a first side 2521 away from the bottom wall 22 along the second direction Z. The adapter tab 3 extends from the first side 2521 to facilitate electrical connection to the carrier part 31.

[0067] In some embodiments, the first part 251 includes a first bending part 2511 and a second bending part 2512. The first bending part 2511 is connected to the first body wall 211 and is disposed opposite to the first body wall 211 along the second direction Z. The second bending part 2512 is connected to the portion of the first side 2521 near the first body wall 211. Along the second direction Z, the projection of the second bending part 2512 overlaps with the projection of the third wall 2123 to improve the packaging stability between the first part 251 and the second part 252.

[0068] Please refer to Figures 1 and 3 together. Observing along the first direction X, the height difference between the first side 2521 and the first part 251 in the second direction Z is L1, where 0mm ≤ L1 ≤ 0.5mm. This limits the space occupied by the first side 2521 and the first part 251 at the head of the battery 100A, which is beneficial to improving the energy density of the battery 100A. Furthermore, L1 can also serve as a tolerance to facilitate the production of the battery 100A.

[0069] It should be noted that L1 is measured in the following way: the edge of the first bending part 2511 away from the first body wall 211 is used as the reference line, the distance between the first side 2521 and the reference line is measured three times, and the average of the three distance values ​​is calculated. The average value is L1.

[0070] Optionally, along the second direction Z, the first side 2521 is closer to the bottom wall 22 than the first part 251, meaning the first side 2521 is lower than the first part 251; or the first side 2521 is flush with the first part 251; or the first part 251 is closer to the bottom wall 22 than the first side 2521, meaning the first side 2521 is higher than the first part 251. This application uses the example of the first side 2521 being flush with the first part 251 for illustration.

[0071] Optionally, L1 can be any value within the range of 0mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, and any other value within the range of 0mm≤L1≤0.5mm.

[0072] Please refer to Figures 1 and 3 together. 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.

[0073] In some embodiments, the portion of the adapter tab 3 extending out of the first side 2521 includes a first segment 301, a second segment 302, and a third segment 303. The first segment 301 extends out of the first side 2521 along the second direction Z. The second segment 302 is bent and connected to the first segment 301 and extends towards the support portion 31 along the first direction X. The third segment 303 is bent and connected to the second segment 302 and extends towards the first concave wall 212 along the second direction Z.

[0074] In some embodiments, the battery cell 1 includes tab adhesive 304, a portion of which is located within the second part 252 and wraps around the surface of the adapter tab 3 located within the second part 252, and a portion of which is located outside the second part 252 and wraps around at least a portion of the surface of the first segment 301. The tab adhesive 40 located in the first segment 301 is disposed in the first notch 2522 to reduce the space occupied by the tab adhesive 40 at the head of the battery 100A, which is beneficial to improving the energy density of the battery 100A.

[0075] Please refer to Figures 1, 2, and 3 together. In some embodiments, the encapsulation portion 20B includes a side seal portion 26, which is connected to and bent toward the first sidewall 23. Along the second direction Z, one end of the side seal portion 26 protrudes out of the side seal portion 26 and is connected to the top seal portion 25 to improve encapsulation stability.

[0076] The top wall 21 includes two first recessed walls 213, each of which is disposed between a first recessed wall 212 and a corresponding first side wall 23, i.e., each first recessed wall 213 is disposed between a second wall 2122 and a corresponding first side wall 23. Along the second direction Z, the distance between the first body wall 211 and the bottom wall 22 is D1, and the distance between the first recessed wall 213 and the bottom wall 22 is D2, where D1 > D2. This allows the main body 20A to form a space to accommodate the encapsulation part 20B at the corners at both ends of the top wall 21, reducing the space occupied by the encapsulation part 20B at the corners in the head of the battery 100A, which is beneficial to improving the energy density of the battery 100A.

[0077] In some embodiments, the top seal 25 includes a third portion 253 extending along a second direction Z. The third portion 253 connects the first recessed wall 213, the second portion 252, and the side seal 26 to improve the stability of the package. The corner portion of the package 20B refers to the portion where the third portion 253 and the side seal 26 are connected to the third portion 253.

[0078] In some embodiments, 1mm ≤ D1-D2 ≤ 3mm. When D1-D2 is too small (e.g., less than 1mm), assuming the third part 253 has sufficient packaging width to ensure packaging stability, the third part 253 may exceed the first part 251 in the third direction Z, which is detrimental to improving the energy density of the battery 100A. When D1-D2 is too large (e.g., greater than 3mm), it will result in excessive occupation of the space of the electrode assembly 10 at the corner, leading to 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.

[0079] Optionally, D1-D2 can be any one of the following values: 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, or any other value within the range of 1mm≤D1-D2≤3mm.

[0080] In some embodiments, along the third direction Y, the projection of the first recessed wall 213 is located between the projection of the first main body wall 211 and the projection of the third wall 2123 of the corresponding first concave wall 212, so that the support portion 31 is located in the first accommodating space 20C.

[0081] Please refer to Figures 1 and 3 together. In some embodiments, the substrate 30 includes a connecting portion 32 located along the second direction Z on the side of the first portion 251 away from the first body wall 211. The connecting portion 32 connects two support portions 31, which extend from the connecting portion 32 along the second direction Z toward the first accommodating space 20C. The two support portions 31 are connected by the connecting portion 32 to electrically connect two adapter tabs of different polarities, forming a complete current loop.

[0082] In some embodiments, the height difference between the side of the third part 253 away from the bottom wall 22 and the connecting part 32 in the second direction Z is L2, where 0mm≤L2≤0.5mm, to limit the space occupied by the third part 253 at the head of the battery 100A, which is beneficial to improving the energy density of the battery 100A. Furthermore, L2 can also serve as a reserved tolerance to facilitate the production of the battery 100A.

[0083] It should be noted that L2 is measured in the following way: taking the edge of the connecting part 32 away from the first body wall 211 as the reference line, the distance between the side of the third part 253 away from the bottom wall 22 and the reference line is measured. The measurement is performed three times, and the average value of the three distance values ​​is calculated. The average value is L2.

[0084] Optionally, along the second direction Z, the side of the third part 253 away from the bottom wall 22 is closer to the bottom wall 22 than the connecting part 32, that is, the side of the third part 253 away from the bottom wall 22 is lower than the connecting part 32; or the side of the third part 253 away from the bottom wall 22 is flush with the connecting part 32; or the side of the connecting part 32 away from the bottom wall 22 is closer to the bottom wall 22 than the side of the third part 253, that is, the side of the connecting part 32 is higher than the side of the third part 253. This application uses the example of the side of the third part 253 away from the bottom wall 22 being lower than the connecting part 32 for explanation.

[0085] Optionally, L2 can be any value within the range of 0mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, and any other value within the range of 0mm≤L2≤0.5mm.

[0086] Please refer to Figures 1 and 3 together. In some embodiments, the battery 100A includes a first insulating member 51 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, as well as to improve the stability of the circuit board assembly 2 at the head of the battery 100A.

[0087] Please refer to Figures 1, 2, and 4 together. In some embodiments, the circuit board assembly 2 includes a connector 41 connected to the side of the support portion 31 facing the second portion 252. The connector 41 is connected to the adapter tab 3, which helps to improve the stability of the connection between the adapter tab 3 and the support portion 31. Furthermore, the support portion 31 and the connector 41 are located in the first accommodating space 20C to reduce the space waste caused by placing the connector 32 in the first body wall 211 and improve the energy density of the battery 100A.

[0088] In some embodiments, the connector 41 is a U-shaped connector piece, and the connector 41 includes two first connecting segments 411 spaced apart along a 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 support portion 31, and the ends of the two first connecting segments 411 away from the second connecting segment 412 form an opening 413. The adapter tab 3 extends into the opening 413 and is connected to the other first connecting segment 411 to improve the stability of the connection between the connector 41 and the adapter tab 3.

[0089] It is understood that in some embodiments, the connector 41 is an "L"-shaped connector, meaning that the above-mentioned electrical connection can also be achieved by bending the corresponding connector once.

[0090] It is understood that in some embodiments, the connector 41 is a flat nickel block.

[0091] Please refer to Figures 1, 3, and 4 together. In some embodiments, the circuit board assembly 2 includes a first protection device 42 connected to the carrier portion 31. The first protection device 42 is configured to form a protection circuit for protecting the battery cell 1. The protection circuit may provide, but is not limited to, overcharge, over-discharge, overcurrent, short circuit, and anti-counterfeiting protection functions for the battery cell 1. The carrier portion 31 and the first protection device 42 are located in the first accommodating space 20C to reduce space waste caused by placing the protection device at the head of the battery 100A and improve the energy density of the battery 100A. Furthermore, the first protection device 42 can support the carrier portion 31 to improve the structural strength of the carrier portion 31, thereby improving the stability of the connection between the carrier portion 31 and the connector 41, as well as the stability of the connection between the carrier portion 31 and the adapter tab 3.

[0092] 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 at least one of the following: a current sensing resistor, a resistor for detecting battery temperature, a transistor for controlling the disconnection of the battery charging / discharging circuit, a transient suppression diode for port surge protection, a protection chip for detecting battery overvoltage, undervoltage, and overcurrent faults, an encryption chip, an ID resistor, and components integrating IC and MOS functions.

[0093] In some embodiments, the first protection device 42 is a SIP module formed by SIP packaging technology, wherein SIP packaging technology refers to a packaging method that integrates multiple functional chips (including processors, memory, etc.) into one package to achieve a basically complete function.

[0094] It is understood that in some embodiments, the first protective device 42 includes an electronic component and an injection-molded body, the electronic component being directly welded to the carrier portion 31, and the injection-molded body covering the electronic component and the carrier portion 31 to protect the electronic component.

[0095] Please refer to Figures 1 and 3 together. In some embodiments, the substrate 30 includes a first extension 33 that extends from the support portion 31 in a second direction Z toward a direction away from the bottom wall 22, so that the circuit board assembly 2 can be electrically connected to an external circuit outside the top cover portion 25 through the first extension 33. The external circuit may be, but is not limited to, the motherboard of a terminal device powered by a battery 100A.

[0096] In some embodiments, the first extension 33 includes a first extension segment 331 and a second extension segment 332. The first extension segment 331 is connected to the support portion 31 and extends along a first direction X. The projection of the first extension segment 331 overlaps with the projection of the support portion 31. The second extension segment 332 is connected to the first extension segment 331 and extends in a direction away from the top seal portion 221. The second extension segment 332 is provided with a connector 43 for electrical connection with an external circuit.

[0097] Optionally, when viewed along the first direction X, the second extension segment 332 extends along the second direction Z.

[0098] Referring to Figures 1 and 3, in some embodiments, the first extension 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 support portion 31, and the second sub-segment 331B is connected to the second extension 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 sidewall 24, so as to extend the first extension 331 so that the first extension 331 can provide a margin of movement for the second extension 332, thereby improving the reliability of the electrical connection between the connector 43 and the external circuit.

[0099] In some embodiments, when viewed along the first direction X, the first extension 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.

[0100] In some embodiments, the end of the first segment 331A away from the second segment 331B is bent and connected to the side of the support portion 31 away from the first wall 2121, so that a space for accommodating the first protective device 42 is formed between the first segment 331A and the support portion 31. Along the first direction X, the first protective device 42 is located between the first segment 331A and the support portion 31, reducing the risk of interference between the first segment 331A and the first protective device 42.

[0101] In some embodiments, the substrate 30 is a flexible printed circuit (FPC), which is a printed circuit made of a flexible insulating substrate.

[0102] In some embodiments, the support portion 31, the connecting portion 32, and the first extension portion 33 are integrally disposed to improve the structural stability of the substrate 30.

[0103] Please refer to Figure 5. It should be noted that the top seal 221 and side seal 222 in Figure 5 are in an folded state. In some embodiments, the electrode assembly 10 includes an electrode group 11 and an inner tab 12. The electrode group 11 includes a positive electrode, a separator, and a negative electrode arranged sequentially. Optionally, the positive electrode, separator, and negative electrode are stacked. The portion of the electrode group 11 adjacent to the first concave wall 212 has a first concave surface 111, and the inner tab 12 extends from the first concave surface 111. The inner tab 12 connects to the adapter tab 3 and forms a connecting portion 121, so that the adapter tab 3 is electrically connected to the electrode assembly 10. The connecting portion 121 is located between the first concave surface 111 and the first concave wall 212, so that the connecting portion 121 and the electrode group 11 share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100A.

[0104] In some embodiments, the first concave wall 212, the first concave surface 111, and the second sidewall 24 together enclose a space for accommodating the connecting portion 121. Along the first direction X, the portion of the second sidewall 24 that overlaps with the connecting portion 121 and the inner electrode tab 12 is a suspended sidewall, and the portion of the second sidewall 24 that overlaps with the electrode assembly 11 is a main body sidewall. Since the suspended sidewall corresponds to the space accommodating the connecting portion 121 and is hollow inside, it may exhibit irregular concave-convex surfaces due to collisions. The main body sidewall overlaps with the electrode assembly 11, so it is generally planar. In some embodiments, the suspended sidewall may also be planar like the main body sidewall.

[0105] Optionally, the joint 121 is a weld mark formed by welding the inner electrode 12 and the adapter electrode 3.

[0106] Referring to 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 a third direction Y, the second surface 111B and the second wall 2122 are arranged along a third direction Y, and the third surface 111C is arranged along a second direction Z and the third wall 2123. The inner electrode tab 12 extends from one of the three surfaces: the first surface 111A, the second surface 111B, and the third surface 111C. A space for accommodating the joint 121 is formed between the third surface 111C and the third wall 2123.

[0107] In some embodiments, when viewed along the third direction Y, the joint 121 is inclined between the third surface 111C and the third wall 2123 to reduce the stress on the joint 121 due to excessive bending.

[0108] In some embodiments, when viewed along the first direction X, a portion of the first surface 111A near the third surface 111C protrudes toward the junction 121 to increase the capacity of the electrode assembly 11.

[0109] Please refer to Figures 1 and 6 together. In some embodiments, the battery 100A also includes a second insulating member 52, which is bonded to both sides of the top seal 25 in its thickness direction and the cross-section of its exposed metal, as well as to both sides of the side seal 26 where it connects to the top seal 25 in its thickness direction and the cross-section of its exposed metal, in order to improve the insulation stability of the circuit board assembly 2 and the packaging bag 20.

[0110] In some embodiments, the battery 100A further includes a third insulating member 53, which is bonded to the surface of the connecting portion 32 away from the top sealing portion 25. The third insulating member 53 is also bonded to the two second sidewalls 24 and covers the first recessed wall 212 in the first direction X, so as to improve the insulation stability of the circuit board assembly 2 and the packaging bag 20.

[0111] In some embodiments, when viewed along the first direction X, the portion of the third insulating member 53 covering the first recess 212 has a gap, and the first extension 33 extends out from the gap to facilitate electrical connection between the first extension 33 and the external circuit outside the top seal 25.

[0112] Example 2

[0113] Referring to Figure 7, one embodiment of this application also provides a battery 100B. The difference between battery 100B and battery 100A lies in the structure of the first extension 33.

[0114] The first extension 33 includes a first extension segment 331 and a second extension segment 332. The first extension segment 331 connects to the support portion 31, and the second extension segment 332 connects to the first extension segment 331 and extends in a direction away from the top seal portion 221. The second extension segment 332 is provided with a connector 43 for electrical connection to an external circuit. Along the first direction X, the first extension 33 overlaps with the second portion 252. When viewed along the first direction X, the first extension 33 is separated from the second sidewall 24 to reduce the risk of interference between the first extension 33 and the second sidewall 24.

[0115] In some embodiments, one end of the first extension 331 is bent and connected to the side of the support portion 31 away from the first wall 2121, so that a space for accommodating the first protective device 42 is formed between the first extension 331 and the support portion 31. Along the first direction X, the first protective device 42 is located between the first extension 331 and the support portion 31, reducing the risk of interference between the first extension 331 and the first protective device 42.

[0116] In some embodiments, both support portions 31 are provided with a first extension portion 33 to improve the overcurrent performance of the circuit board assembly 2.

[0117] Apart from the differences mentioned above, the parameters of battery 100B and battery 100A are roughly the same. Please refer to the description of battery 100A above.

[0118] Example 3

[0119] Referring to Figure 8, an embodiment of this application also provides a battery 100C. The difference between battery 100C and battery 100A lies in the structure of the first extension 33.

[0120] The first extension 33 extends from the support portion 31 in a direction away from the first sidewall 23 along the third direction Y, so that the circuit board assembly 2 can be electrically connected to an external circuit outside the first sidewall 23 through the first extension 33. The external circuit may be, but is not limited to, the motherboard of a terminal device powered by a battery 100C.

[0121] In some embodiments, the first extension 33 includes a first extension segment 331 and a second extension segment 332. The first extension segment 331 is connected to the support portion 31, and the second extension segment 332 is connected to the first extension segment 331 and extends in a direction away from the first sidewall 23. The second extension segment 332 is provided with a connector 43 for electrical connection with an external circuit.

[0122] Optionally, when viewed along the first direction X, the second extension segment 332 extends along the third direction Y.

[0123] In some embodiments, the first extension 331 includes a first sub-segment 331A, a second sub-segment 331B, and a third sub-segment 331C. The first sub-segment 331A is connected to the support portion 31 and is aligned with the second wall 2122 along a third direction Y. The second sub-segment 331B is connected to the first sub-segment 331A and is aligned with the second sidewall 24 along a first direction X. The third sub-segment 331C is connected to the second sub-segment 331B and is aligned with the first sidewall 23 along a third direction Y. The second extension 332 is connected to the third sub-segment 331C.

[0124] Apart from the differences mentioned above, the parameters of battery 100C and battery 100A are roughly the same. Please refer to the description of battery 100A above.

[0125] Example 4

[0126] Referring to Figure 9, an embodiment of this application also provides a battery 100D. The difference between battery 100D and battery 100A is that the first extension 33 is provided with electronic components.

[0127] The circuit board assembly 2 includes a second protection device 44. The substrate 30 includes a first extension 33, which extends from the support portion 31 in a second direction Z toward a direction away from the bottom wall 22, so that the circuit board assembly 2 can be electrically connected to an external circuit outside the top seal portion 25 via the first extension 33. This external circuit can be, but is not limited to, the motherboard of the terminal device powered by the battery 100D. The second protection device 44 is disposed on the first extension 33. Viewed along the first direction X, the second protection device 44 is separate from the battery cell 1 and is configured to form a protection circuit for protecting the battery cell 1. When the first extension 33 is located in the motherboard compartment of the terminal device and connected to the motherboard of the terminal device, the second protection device 44 can utilize the space in the motherboard compartment of the terminal device to reduce the space occupied by the protection device at the head of the battery 100D, which is beneficial for improving the energy density of the battery 100D.

[0128] In some embodiments, the second protection device 44 is a SIP module. A first region 33A and a second region 33B are provided at the portion of the first extension 33 protruding from the top seal 25. The first region 33A is contoured to the second protection device 44, and the second protection device 44 is located in the first region 33A. The second region 33B is located on the side of the first region 33A away from the battery cell 1, and the second region 33B is provided with a connector 43 for electrical connection to an external circuit.

[0129] It is understood that in some embodiments, the second protective device 44 includes an electronic device and an injection-molded body, the electronic device being directly welded to the first extension 33, and the injection-molded body covering the electronic device and the portion of the first extension 33 where the electronic device is located, in order to protect the electronic device.

[0130] In some embodiments, a first protective device 42 and a second protective device 44 are defined according to the size of the electronic device, the support portion 31 is provided with the first protective device 42, and the first extension portion 33 is provided with the second protective device 44.

[0131] In some embodiments, the distance between the surface of the support portion 31 away from the second portion 252 and the corresponding second sidewall 24 in the first direction X is used as a preset threshold. Electronic devices with a height greater than the preset threshold are provided as second protection devices 44 in the first extension portion 33, and electronic devices with a height less than or equal to the preset threshold are provided as first protection devices 42 in the support portion 31. This reduces the space waste caused by electronic devices protruding from the first accommodating space 20C in the first direction X while meeting the protection circuit requirements. This is beneficial for reducing the thickness of the battery 100D and increasing the energy density of the battery 100D.

[0132] Please continue to refer to Figure 9. In some embodiments, the support portion 31 is not provided with the first protective device 42, and the first extension portion 33 is provided with the second protective device 44.

[0133] In some embodiments, the circuit board assembly 2 further includes a first reinforcing plate 45, which is disposed opposite to the connector 41 on both sides of the support portion 31 along a first direction X. The first reinforcing plate 45 is used to improve the structural strength of the support portion 31, thereby improving the stability of the connection between the support portion 31 and the connector 41.

[0134] Apart from the differences mentioned above, the parameters of battery 100D and battery 100A are roughly the same. Please refer to the description of battery 100A above.

[0135] Example 5

[0136] Referring to Figure 10, an embodiment of this application also provides a battery 100E. The difference between battery 100E and battery 100A lies in the structure of one of the second sidewalls 24.

[0137] One of the second sidewalls 24 includes a second main body wall 241, a second recessed wall 242, and a connecting wall 243. Viewed along the first direction X, the connecting wall 243 is spaced apart from the first main body wall 211 along the second direction Z. The second recessed wall 242 connects to the first main body wall 211 on one side of the second direction Z, and connects 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 connects to the second main body wall 241 on the other side of the first direction X. The second recessed wall 242 and the connecting wall 243 form a second accommodating space 20D. The second accommodating space 20D connects to two first accommodating spaces 20C along the third direction Y.

[0138] In some embodiments, the connecting portion 32 is located along the second direction Z on the side of the first portion 251 away from the first body wall 211.

[0139] In some embodiments, at least a portion of the first extension 33 is located in the second accommodating space 20D. The first extension 33 shares the space in the second direction Z with the second recessed wall 242, and the first extension 33 shares the space in the first direction X with the connecting wall 243, so as to reduce the space occupied by the circuit board assembly 2 in the first direction X and the second direction Z, thereby improving the energy density of the battery 100E.

[0140] In some embodiments, the first extension 33 includes a first extension segment 331 and a second extension segment 332. The first extension segment 331 is connected to the support portion 31 and extends from the first accommodating space 20C into the second accommodating space 20D. The second extension segment 332 is connected to the first extension segment 331 and extends in a direction away from the top seal portion 221. The second extension segment 332 is provided with a connector 43 for electrical connection with an external circuit.

[0141] In some embodiments, the first extension 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 support portion 31, and the second sub-segment 331B is connected to the second extension 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 recessed wall 242, so as to extend the first extension 331 so that the first extension 331 can provide a margin of movement for the second extension 332, thereby improving the reliability of the electrical connection between the connector 43 and the external circuit.

[0142] Please refer to Figures 10 and 11 together. 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, where 0.1 mm ≤ T1 - T2 ≤ 0.5 mm. 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 recessed wall 242, thereby improving the space utilization rate of the electrode assembly 10 within the main body portion 20A and facilitating an increase in the capacity of the battery 100E.

[0143] Optionally, T1-T2 can be any value within the range of 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, and any other value within the range of 0.1mm≤L2≤0.5mm.

[0144] In some embodiments, the electrode assembly 10 has a stacked 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.

[0145] Apart from the differences mentioned above, the parameters of battery 100E and battery 100A are roughly the same. Please refer to the description of battery 100A above.

[0146] Example 6

[0147] Referring to Figure 12, one embodiment of this application also provides a battery 100F. The difference between battery 100F and battery 100E lies in the position of the connection portion 32.

[0148] At least a portion of the connecting part 32 is disposed in the second accommodating space 20D. The connecting part 32 shares the space in the second direction Z with the second recessed wall 242, and the connecting part 32 shares the space in the first direction X with the connecting wall 243, so as to reduce the space occupied by the circuit board assembly 2 in the first direction X and the second direction Z, thereby improving the energy density of the battery 100F.

[0149] In some embodiments, the thickness direction of the connecting portion 32 is parallel to the first direction X, and the connecting portion 32 overlaps with the second recessed wall 242 along the first direction X.

[0150] In some embodiments, the battery 100F includes a first insulating member 51 along the second direction Z. The first insulating member 51 is bonded between the connecting portion 32 and the second recessed wall 242 to improve the insulation stability of the circuit board assembly 2 and the packaging bag 20, as well as to improve the stability of the circuit board assembly 2 at the head of the battery 100F.

[0151] Apart from the differences mentioned above, the parameters of battery 100F and battery 100E are roughly the same. Please refer to the description of battery 100E above.

[0152] Example 7

[0153] Referring to Figure 13, one embodiment of this application also provides a battery 100G. The difference between battery 100G and battery 100A lies in the position of the first concave wall 212.

[0154] The two first recessed walls 212 are interconnected, and the two first accommodating spaces 20C are interconnected, so as to shorten the length of the connecting part 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 disposed on both sides of the two first recessed walls 212 along the third direction Y. The first part 251 includes two first sub-parts 251A, and each first sub-part 251A is connected to a first sub-wall 211A. The second part 252 connects the two first sub-parts 251A to improve the packaging stability of the top seal 25.

[0155] In some embodiments, the connecting portion 32 is disposed in two first accommodating spaces 20C and connected between two support portions 31, each support portion 31 being provided with a first protective device 42. The connecting portion 32 shares the space in the first direction X and the second direction Z with the two first recessed walls 212, thereby reducing the space occupied by the circuit board assembly 2 in the first direction X and the second direction Z, which is beneficial to improving the energy density of the battery 100G.

[0156] In some embodiments, when viewed along the first direction X, the first sub-part 251A and the side sealing part 26 are spaced apart to reduce the space waste caused by the corner structure formed at the corner of the encapsulation part 20B located in the main body part 20A, thereby improving the energy density of the battery 100G.

[0157] In some embodiments, the top wall 21 includes a first inclined wall 214 disposed between the first sub-wall 211A and the corresponding first side wall 23. Viewed along the first direction X, the first inclined 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 inclined wall 214, the first sub-portion 251A, and the side sealing portion 26 to reduce the risk of stress concentration at the corner of the encapsulation portion 20B located in the main body portion 20A, and to improve the encapsulation stability at the corner.

[0158] Please refer to Figure 14. It should be noted that the top seal 221 and side seal 222 in Figure 14 are in an folded state. In some embodiments, the electrode assembly 10 includes an electrode group 11 and an inner tab 12. The electrode group 11 includes a positive electrode, a separator, and a negative electrode arranged sequentially. A first concave surface 111 is provided at the portion of the electrode group 11 adjacent to the two first concave walls 212, and the inner tab 12 extends from the first concave surface 111. The inner tab 12 connects to the adapter tab 3 and forms a connecting portion 121, so that the adapter tab 3 is electrically connected to the electrode assembly 10. The connecting portion 121 is located between the first concave surface 111 and the two first concave walls 212, so that the connecting portion 121 and the electrode group 11 share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100A.

[0159] Apart from the differences mentioned above, the parameters of battery 100G and battery 100A are roughly the same. Please refer to the description of battery 100A above.

[0160] Example 8

[0161] Referring to Figure 15, one embodiment of this application also provides a battery 100H. The difference between battery 100H and battery 100A lies in the position of the first concave wall 212.

[0162] The two first recessed walls 212 are interconnected, and the two first accommodating spaces 20C are interconnected, so as to shorten the length of the connecting part 32 in the third direction Y and reduce the production cost of the circuit board assembly 2. One of the first recessed walls 212 is connected to one of the first side walls 23, and the other first recessed wall 212 is connected to the first body wall 211.

[0163] In some embodiments, when viewed along the first direction X, the first portion 251 is spaced apart from the first sidewall 23 away from the two first recessed walls 212, so as to reduce the space waste caused by the corner structure formed at the corner of the package portion 20B located in the main body portion 20A, thereby improving the energy density of the battery 100H.

[0164] In some embodiments, the top wall 21 includes a first inclined wall 214 disposed between the first body wall 211 and a first side wall 23 away from the two first recessed walls 212. Viewed along the first direction X, the first inclined wall 214 is inclined relative to the first body wall 211 and the first side wall 23. The top sealing portion 25 includes a fourth portion 254, which connects the first inclined wall 214, the first portion 251, and the side sealing portion 26 to reduce the risk of stress concentration at the corner of the encapsulation portion 20B located in the main body portion 20A and to improve the encapsulation stability at the corner.

[0165] Please refer to Figure 16. It should be noted that the top seal 221 and side seal 222 in Figure 16 are in an folded state. In some embodiments, the electrode assembly 10 includes an electrode group 11 and an inner tab 12. The electrode group 11 includes a positive electrode, a separator, and a negative electrode arranged sequentially. A first concave surface 111 is provided at the corner adjacent to the two first concave walls 212 of the electrode group 11, and the inner tab 12 extends from the first concave surface 111. The inner tab 12 is connected to the adapter tab 3 and forms a connecting portion 121, so that the adapter tab 3 is electrically connected to the electrode assembly 10. The connecting portion 121 is located between the first concave surface 111 and the two first concave walls 212, so that the connecting portion 121 and the electrode group 11 share the space in the second direction Z, which is beneficial to improving the energy density of the battery 100A.

[0166] Apart from the differences mentioned above, the parameters of battery 100H and battery 100A are roughly the same. Please refer to the description of battery 100A above.

[0167] Example 9

[0168] Please refer to Figure 17. An embodiment of this application also provides a terminal device 200A, including the battery (100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H) in any of the above embodiments.

[0169] Optionally, the terminal device 200 may be a device with a rechargeable battery, such as a mobile phone, tablet computer, laptop computer, smart wearable product (e.g., smartwatch, smart bracelet), virtual reality (VR) terminal device, augmented reality (AR) terminal device, etc.

[0170] In summary, in the aforementioned batteries (100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H) and terminal device 200A, the first concave wall 212 is recessed relative to the first body wall 211 along the second direction Z toward the bottom wall 212. The second part 252 and the first concave wall 212 form a first accommodating space 20C. The supporting part 31 is located in the first accommodating space 20C, thereby reducing 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 batteries (100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H).

[0171] Example 10

[0172] Please refer to Figure 18. An embodiment of this application also provides a terminal device 200B, which includes a motherboard 60, a third protection device 70, and a battery 100I.

[0173] The difference between battery 100I and battery 100A is that the carrier 31 does not have a first protection device 42. Battery 100I is electrically connected to the main board 60, and a third protection device 70 is located 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 battery 100I, which is beneficial to improving the energy density of battery 100I.

[0174] In some embodiments, the end of the first extension 33 away from the bottom wall 22 is electrically connected to the motherboard 60.

[0175] Apart from the differences mentioned above, the parameters of battery 100I and battery 100A are roughly the same. Please refer to the description of battery 100A above.

[0176] Example 11

[0177] Please refer to Figure 19. An embodiment of this application also provides a terminal device 200C, which includes a motherboard 60, a third protection device 70, and a battery 100J.

[0178] The difference between battery 100J and battery 100G is that the carrier 31 does not have a first protection device 42. Battery 100J is electrically connected to the main board 60, and a third protection device 70 is located 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 200C to reduce the space occupied by the protection device at the head of battery 100J, which is beneficial to improving the energy density of battery 100J.

[0179] In some embodiments, the end of the first extension 33 away from the bottom wall 22 is electrically connected to the motherboard 60.

[0180] Apart from the differences mentioned above, the parameters of battery 100J and battery 100G are roughly the same. Please refer to the description of battery 100G above.

[0181] In addition, those skilled in the art may make other changes within the spirit of this application. Of course, all such changes made in accordance with the spirit of this application should be included within the scope disclosed in this application.

Claims

1. A battery, characterized in that, The battery includes: The battery cell includes: Electrode assembly; The packaging bag includes a main body and a packaging part. The electrode assembly is disposed in the main body. The main body includes a top wall and a bottom wall. When viewed along a first direction, the top wall and the bottom wall are spaced apart along a second direction. The first direction is the thickness direction of the battery cell. 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. The first concave wall is recessed relative to the first body wall and toward the bottom wall along the second direction. 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, and the second part is connected to the first concave wall and the first part. The second part and the first concave wall form a first accommodating space. A circuit board assembly, the circuit board assembly including a substrate, the substrate including a carrier portion, the carrier portion being located in the first accommodating space; An adapter tab is provided, one end of which is electrically connected to the electrode assembly, and the other end of which extends from the second part and is electrically connected to the carrier part.

2. The battery as described in claim 1, characterized in that, The first part bends toward the first body wall, the second part extends along the second direction, the second part includes a first side away from the bottom wall along the second direction, the adapter tab extends from the first side, and when viewed along the first direction, the height difference between the first side and the first part in the second direction is L1, 0mm≤L1≤0.5mm.

3. The battery as described in claim 2, characterized in that, The first side has a first notch, and the portion of the adapter tab is located in the first notch.

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

5. The battery as described in claim 1, characterized in that, The circuit board assembly includes a second protection device. The substrate includes a first extension that extends from the support portion in a direction away from the bottom wall along the second direction. The second protection device is disposed on the first extension. When viewed along the first direction, the second protection device is separate from the battery cell.

6. The battery as claimed in claim 1, characterized in that, The main body includes two first sidewalls and two second sidewalls disposed between the top wall and the bottom wall. The two first sidewalls are spaced apart along a third direction, and the two second sidewalls are spaced apart along a 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, the top seal includes two second parts, each second part connecting a first concave wall and a first part, and the battery includes two adapter tabs, each adapter tab extending from a second part; The substrate includes two carrier portions, each of which is located in a first accommodating space and connected to an adapter tab.

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

8. The battery as claimed in claim 7, characterized in that, The substrate includes a connecting portion located along the second direction on the side of the first portion away from the first body wall, and the supporting portion extends from the connecting portion along the second direction toward the first accommodating space; The height difference between the side of the third part away from the bottom wall and the connecting part in the second direction is L2, where 0mm≤L2≤0.5mm.

9. The battery as described in claim 7, characterized in that, One of the second sidewalls includes a second main body wall, a second recessed wall, and a connecting wall. Viewed along the first direction, the connecting wall and the first main body wall are spaced apart along the second direction. The second recessed wall is connected to the first main body wall on one side in the second direction, and the second recessed wall is connected to the connecting wall on one side in the first direction on the other side in the second direction. The connecting wall is connected to the second main body wall on the other side in the first direction. The second recessed wall and the connecting wall form a second accommodating space, and the second accommodating space connects two first accommodating spaces along the third direction. The substrate includes a connecting portion and a first extension portion. The connecting portion connects two of the support portions. The support portions extend from the connecting portion toward the first accommodating space. The first extension portion extends from the support portions along the second direction toward a direction away from the bottom wall. At least a portion of the connecting portion and / or the first extension portion is located in the second accommodating space.

10. The battery as claimed in claim 9, characterized in that, The electrode assembly includes an electrode body and an electrode thinning portion. Along the first direction, the thickness of the electrode body is T1, and the thickness of the electrode thinning portion is T2, where 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.

11. The battery as claimed in claim 6, characterized in that, The encapsulation portion includes a side sealing portion, which is connected to the first sidewall; The two first concave walls are connected to each other, the two first accommodating spaces are interconnected, the first body wall includes two first sub-walls disposed 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 one first sub-wall, and the second part is connected to the two first sub-parts.

12. The battery as claimed in claim 11, characterized in that, Viewed along the first direction, the first sub-part and the side sealing part are spaced apart.

13. The battery as claimed in claim 12, characterized in that, The top wall includes a first inclined wall, which is disposed between the first sub-wall and the corresponding first side wall. 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, which connects the first inclined wall, the first sub-portion, and the side sealing portion.

14. The battery as claimed in claim 6, characterized in that, The encapsulation portion includes a side sealing portion, which is connected to the first sidewall; The two first concave walls are connected to each other, the two first accommodating spaces are interconnected, 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.

15. The battery as claimed in claim 14, characterized in that, Viewed along the first direction, the first part is spaced apart from the first sidewalls that are away from the two first concave walls.

16. The battery as claimed in claim 15, characterized in that, The top wall includes a first inclined wall, which is disposed between the first main 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 main body wall and the first side wall. The top sealing portion includes a fourth portion, which connects the first inclined wall, the first portion, and the side sealing portion.

17. The battery as claimed in claim 1, characterized in that, The electrode assembly includes an electrode group and an inner electrode tab. The electrode group has a first concave surface at the part adjacent to the first concave wall. The inner electrode tab extends from the first concave surface and is connected to the adapter tab to form a joint. The joint is located between the first concave surface and the first concave wall.

18. A terminal device, characterized in that, Includes the battery as described in any one of claims 1 to 17.

19. A terminal device, characterized in that, It includes a motherboard, a third protection device, and a battery as described in claim 1, wherein the battery is electrically connected to the motherboard, and the third protection device is disposed on the motherboard.

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