Battery and terminal device

Abstract

A battery and terminal device are disclosed. The battery includes a cell and a circuit board assembly. The cell includes a first tab, a second tab, a third tab, and a fourth tab arranged sequentially along a first direction. The first tab and the second tab have the same polarity, the third tab and the fourth tab have the same polarity, and the second tab has the opposite polarity to the third tab. The circuit board assembly includes a first circuit board, a first connector, a second connector, a third connector, a fourth connector, and a protection switch module. The first connector, the second connector, the third connector, and the fourth connector are arranged sequentially on the first circuit board along the first direction. The first circuit board integrates a first circuit and a second circuit. The first circuit includes a first branch connecting the first connector and the second connector in series, and the second circuit includes a third branch connecting the third connector and the fourth connector in series. The protection switch module is connected in series in either the first branch or the third branch. This battery is advantageous for improving energy density.

Description

Technical Field

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

[0002] Existing technology increases charging speed by increasing the number of tabs on the battery cell. However, increasing the number of tabs leads to excessive wiring on the protection board, requiring additional layers to thicken or widen the protection board, resulting in a loss of battery energy density. Utility Model Content

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

[0004] Embodiments of this application provide a battery, including a battery cell and a circuit board assembly. The battery cell includes a first tab, a second tab, a third tab, and a fourth tab arranged sequentially along a first direction, perpendicular to the thickness direction of the battery. The first tab and the second tab have the same polarity, the third tab and the fourth tab have the same polarity, and the second tab has the opposite polarity to the third tab. The circuit board assembly includes a first circuit board, a first connector, a second connector, a third connector, a fourth connector, and a protection switch module. The first connector, the second connector, the third connector, and the fourth connector are arranged sequentially on the first circuit board along the first direction. The first connector is connected to the first tab, the second connector is connected to the second tab, the third connector is connected to the third tab, and the fourth connector is connected to the fourth tab. The first circuit board integrates a first line and a second line. The first line includes a first branch connected in series with the first connector and the second connector. The second line includes a third branch connected in series with the third connector and the fourth connector. The protection switch module is connected in series with the first branch or the third branch to simplify the electrical connection lines of the first circuit board, disperse the current transmission path, and reduce impedance and temperature rise. This eliminates the need for additional layers to thicken or widen the first circuit board, which helps to reduce the space waste generated by the circuit board assembly on the cell side and improve the energy density of the battery.

[0005] In some embodiments of this application, the circuit board assembly includes a first connector and a second connector connected to a first circuit board. The first connector has two first connection terminals of the same polarity, and the second connector has two second connection terminals of the same polarity. A first line includes two second branches, and the two first connection terminals are connected in parallel to the first branches through the two second branches to shorten the length of the first line, thereby reducing impedance and temperature rise. A second line includes two fourth branches, and the two second connection terminals are connected in parallel to a third branch through the two fourth branches to shorten the length of the second line, thereby reducing impedance and temperature rise. The first and second connection terminals are configured to be connected to external circuitry, respectively.

[0006] In some embodiments of this application, the circuit board assembly includes a third connector connected to a first circuit board. The third connector has first and second connection terminals with opposite polarities. The first connection terminal is connected in series with a first branch to shorten the length of the first line, which helps to reduce impedance and temperature rise. The second connection terminal is connected in series with a third branch to shorten the length of the second line, which also helps to reduce impedance and temperature rise. The first and second connection terminals are configured to be connected to external circuitry, respectively.

[0007] Embodiments of this application provide a battery, including a battery cell and a circuit board assembly. The battery cell includes a first tab, a second tab, a third tab, and a fourth tab arranged sequentially along a first direction, perpendicular to the thickness direction of the battery. The polarity of the first tab is opposite to that of the second tab, the polarity of the third tab is opposite to that of the fourth tab, and the polarity of the second tab is the same as that of the third tab. The circuit board assembly includes a first circuit board, a first connector, a second connector, a third connector, a fourth connector, and a protection switch module. The first connector, the second connector, the third connector, and the fourth connector are arranged sequentially along the first direction on the first circuit board, and the protection switch module is located between the second connector and the third connector. The first connector is connected to the first tab, the second connector is connected to the second tab, the third connector is connected to the third tab, and the fourth connector is connected to the fourth tab. The first circuit board integrates a first line, a second line, a third line, and a fourth line. The first line connects to the first connector, the second line connects to the fourth connector, the third line connects to the second connector through a protection switch module, and the fourth line connects to the third connector through a protection switch module. This simplifies the electrical connection lines of the first circuit board, disperses the current transmission path, and reduces impedance and temperature rise. This eliminates the need for additional layers to thicken or widen the first circuit board, which helps reduce space waste on the cell side of the circuit board assembly and improves the energy density of the battery.

[0008] In some embodiments of this application, the circuit board assembly includes two fourth connectors connected to a first circuit board. Each fourth connector has a first connection terminal and a second connection terminal with opposite polarities. A first line and a third line are connected to one of the fourth connectors. The first line is connected in series with a first connector and a first connection terminal, and the third line is connected to a second connection terminal to shorten the length of the first line, thereby reducing impedance and temperature rise. A second line and a fourth line are connected to the other fourth connector. The second line is connected in series with a fourth connector and a first connection terminal, and the fourth line is connected to a second connection terminal to shorten the length of the second line, thereby reducing impedance and temperature rise. The first and second connection terminals are configured to connect to external circuitry, respectively.

[0009] In some embodiments of this application, the first circuit board includes a first sub-board and a second sub-board that are separately configured. The first sub-board has a first connector, a second connector, a fourth connector, and a protection switch module, and integrates a first circuit and a third circuit. The second sub-board has a third connector, a fourth connector, a fourth connector, and a protection switch module, and integrates a second circuit and a fourth circuit. The separate configuration of the first and second sub-boards can reduce temperature rise.

[0010] In some embodiments of this application, the battery cell includes a packaging bag, which includes a main body and an encapsulation portion. The main body includes a top wall, and the encapsulation portion includes a top seal connected to the top wall. A first tab, a second tab, a third tab, and a fourth tab extend from the top seal, and a circuit board assembly is disposed on the top wall. The battery includes an injection molded part connected to the top wall and encapsulating the top seal. A first circuit board includes a base and a bent portion. The base is located within the injection molded part, and the bent portion extends out of the injection molded part and bends towards the base on the side away from the top wall. The injection molded part can improve the structural stability of the battery head.

[0011] In some embodiments of this application, the injection molded part has a recess on the side away from the top wall, and at least part of the bent part is located in the recess. The bent part and the injection molded part share the space in the thickness direction of the injection molded part, so as to reduce the space waste generated by the bent part at the battery head and improve the energy density of the battery.

[0012] In some embodiments of this application, the battery includes a first protection device connected to a first circuit board. The first protection device includes a first PCB board, a first electronic component, and an injection-molded portion. The first PCB board is connected to the first circuit board, the injection-molded portion covers the side of the first PCB board away from the first circuit board, and the first electronic component is located within the injection-molded portion and electrically connected to the first PCB board. The first protection device can improve the structural strength of the first circuit board, thereby facilitating a reduction in the thickness of the first circuit board and consequently improving the energy density of the battery.

[0013] An embodiment of this application provides a terminal device, which includes a battery as described in the above embodiments.

[0014] Embodiments of this application provide a terminal device, which includes a motherboard, a second protection device, and a battery as described in the above embodiments. The battery is electrically connected to the motherboard, and the second protection device is electrically connected to both the battery and the motherboard. The second protection device can replace the first protection device, thereby reducing the space wastage caused by placing the protection device at the battery head and improving energy density.

[0015] In the aforementioned battery and terminal device, the different polarity arrangements of the first tab, second tab, third tab, and fourth tab can simplify the electrical connection lines of the first circuit board, disperse the current transmission path, and reduce impedance and temperature rise. This eliminates the need for additional layers to thicken or widen the first circuit board, which helps reduce space waste on the cell side of the circuit board assembly and improves the energy density of the battery. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the battery structure in one embodiment of this application.

[0017] Figure 2 This is a schematic diagram of the first structure of the first circuit board of the battery in one embodiment of this application.

[0018] Figure 3 yes Figure 1 An enlarged view of the first protection device.

[0019] Figure 4 This is a schematic diagram of the structure of the injection-molded battery in one embodiment of this application.

[0020] Figure 5 This is a schematic diagram of the second structure of the first circuit board of the battery in one embodiment of this application.

[0021] Figure 6 This is a schematic diagram of the third structure of the first circuit board of the battery in one embodiment of this application.

[0022] Figure 7 This is a fourth structural schematic diagram of the first circuit board of the battery in one embodiment of this application.

[0023] Figure 8 This is a fifth structural schematic diagram of the first circuit board of the battery in one embodiment of this application.

[0024] Figure 9 This is a sixth structural schematic diagram of the first circuit board of the battery in one embodiment of this application.

[0025] Figure 10 This is a schematic diagram of the terminal device in one embodiment of this application.

[0026] Explanation of main component symbols

[0027] Batteries 100A, 100B, 100C, 100D, 100E

[0028] Terminal device 200

[0029] Battery Cell 10

[0030] First Pole Ear 11

[0031] Second pole ear 12

[0032] Third pole ear 13

[0033] Fourth pole ear 14

[0034] Packaging bag 15

[0035] Main body 151

[0036] Top Wall 1511

[0037] Packaging section 152

[0038] Top sealing section 1521

[0039] Circuit board assembly 20

[0040] Line 1, 20A

[0041] First Branch Road 20A1

[0042] Second Branch Road 20A2

[0043] Line 20B

[0044] Third Branch Road 20B1

[0045] Fourth Branch Road 20B2

[0046] Line 3 20C

[0047] Line 4, 20D

[0048] First circuit board 21

[0049] Part 1, Chapter 211

[0050] Part 2, Chapter 212

[0051] Part 3, Chapter 213

[0052] Base 21A

[0053] Bending part 21B

[0054] First sub-bend 21B1

[0055] Second sub-bend 21B2

[0056] First daughterboard 21C

[0057] Second sub-board 21D

[0058] First connector 22

[0059] Second connector 23

[0060] Third connector 24

[0061] Fourth connector 25

[0062] Protection switch module 26

[0063] First connector 31

[0064] First connecting terminals 311, 331, 341

[0065] Second connector 32

[0066] Second connection terminals 321, 332, 342

[0067] Third connector 33

[0068] Fourth connector 34

[0069] Injection molded part 40

[0070] Recess 41

[0071] 42

[0072] First protection device 50

[0073] First PCB board 51

[0074] First electronic component 52

[0075] Injection Molding Department 53

[0076] First direction X

[0077] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0078] 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.

[0079] 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%.

[0080] 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.

[0081] 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 or coincidence of the projected portions of two components when viewed in a certain direction.

[0082] One embodiment of this application provides a battery, which includes a battery cell and a circuit board assembly. The battery cell includes a first tab, a second tab, a third tab, and a fourth tab arranged sequentially along a first direction, perpendicular to the thickness direction of the battery. The first tab and the second tab have the same polarity, the third tab and the fourth tab have the same polarity, and the second tab has the opposite polarity to the third tab. The circuit board assembly includes a first circuit board, a first connector, a second connector, a third connector, a fourth connector, and a protection switch module. The first connector, the second connector, the third connector, and the fourth connector are arranged sequentially on the first circuit board along the first direction. The first connector connects to the first tab, the second connector connects to the second tab, the third connector connects to the third tab, and the fourth connector connects to the fourth tab. The first circuit board integrates a first circuit and a second circuit. The first circuit includes a first branch connecting the first connector and the second connector in series, and the second circuit includes a third branch connecting the third connector and the fourth connector in series. The protection switch module is connected in series in the first branch or the third branch.

[0083] In the aforementioned battery, the first branch is connected in series with the first connector and the second connector, and the third branch is connected in series with the third connector and the fourth connector. The protection switch module is connected in series with the first branch or the third branch to simplify the electrical connection lines of the first circuit board, disperse the current transmission path, and reduce impedance and temperature rise. This eliminates the need for additional layering or widening of the first circuit board, which helps to reduce space waste on the cell side of the circuit board assembly and improve the energy density of the battery.

[0084] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0085] Example 1

[0086] Please refer to the following: Figure 1 and Figure 2 One embodiment of this application provides a battery 100A. Battery 100A can be used in secondary batteries, which are batteries that can be recharged after discharge to activate the active materials and continue to be used.

[0087] Battery 100A includes a cell 10 and a circuit board assembly 20. Cell 10 includes a first tab 11, a second tab 12, a third tab 13, and a fourth tab 14 arranged sequentially along a first direction X. The first direction X is perpendicular to the thickness direction of battery 100A and is also the width direction of battery 100A. The polarity of the first tab 11 is the same as that of the second tab 12, the polarity of the third tab 13 is the same as that of the fourth tab 14, and the polarity of the second tab 12 is opposite to that of the third tab 13. The first tab 11, second tab 12, third tab 13, and fourth tab 14 are used for electrical connection with the circuit board assembly 20 to form a complete current loop.

[0088] Optionally, the polarity of the first electrode 11 and the polarity of the second electrode 12 are both positive, and the polarity of the third electrode 13 and the fourth electrode 14 are both negative; or the polarity of the first electrode 11 and the polarity of the second electrode 12 are both negative, and the polarity of the third electrode 13 and the fourth electrode 14 are both positive.

[0089] The circuit board assembly 20 includes a first circuit board 21, a first connector 22, a second connector 23, a third connector 24, a fourth connector 25, and a protection switch module 26. The first connector 22, second connector 23, third connector 24, and fourth connector 25 are arranged sequentially along a first direction X on the first circuit board 21. The first connector 22 is connected to the first tab 11, the second connector 23 is connected to the second tab 12, the third connector 24 is connected to the third tab 13, and the fourth connector 25 is connected to the fourth tab 14.

[0090] Optionally, the first connector 22, the second connector 23, the third connector 24, and the fourth connector 25 are U-shaped nickel sheets, L-shaped nickel sheets, or nickel blocks.

[0091] The first tab 11, the second tab 12, the third tab 13 and the fourth tab 14 are connected to the corresponding first connector 22, the second connector 23, the third connector 24 and the fourth connector 25, which can disperse the current transmission path and improve the rate performance, thereby increasing the charging speed of the battery 100A.

[0092] The first circuit board 21 integrates a first circuit 20A and a second circuit 20B. The first circuit 20A includes a first branch 20A1 connected in series with the first connector 22 and the second connector 23. The second circuit 20B includes a third branch 20B1 connected in series with the third connector 24 and the fourth connector 25. A protection switch module 26 is connected in series with either the first branch 20A1 or the third branch 20B1. The protection switch module 26 is used to actively disconnect or restore the circuit, reducing the risk of damage to the battery 100A due to abnormal operating conditions (such as overcharging, over-discharging, overcurrent, short circuit, etc.).

[0093] In the aforementioned battery 100A, the first branch 20A1 is connected in series with the first connector 22 and the second connector 23, the third branch 20B1 is connected in series with the third connector 24 and the fourth connector 25, and the protection switch module 26 is connected in series with the first branch 20A1 or the third branch 20B1. This simplifies the electrical connection lines of the first circuit board 21, disperses the current transmission path, and reduces impedance and temperature rise. This eliminates the need for additional layering or widening of the first circuit board 21, which helps to reduce the space waste generated by the circuit board assembly 20 on the cell 10 side and improves the energy density of the battery 100A.

[0094] Please see Figure 2 In some embodiments, the circuit board assembly 20 includes a first connector 31 and a second connector 32 connected to the first circuit board 21. The first connector 31 has two first connection terminals 311 of the same polarity, and the second connector 32 has two second connection terminals 321 of the same polarity. The first connection terminals 311 and the second connection terminals 321 are configured to be connected to an external circuit, respectively. The external circuit may be, but is not limited to, a mainboard electrically connected to the battery 100A.

[0095] The first line 20A includes two second branches 20A2. Two first connection terminals 311 are connected in parallel to the first branch 20A1 through the two second branches 20A2, which shortens the length of the first line 20A and helps reduce impedance and temperature rise. The second line 20B includes two fourth branches 20B2. Two second connection terminals 321 are connected in parallel to the third branch 20B1 through the two fourth branches 20B2, which shortens the length of the second line 20B and helps reduce impedance and temperature rise.

[0096] In some embodiments, the first branch 20A1 or the third branch 20B1 of the series protection switch module 26 is a negative circuit to adapt to the reference ground of the battery management chip, without the need for additional isolation or level conversion circuits, so as to simplify the electrical connection lines and reduce production costs.

[0097] In some embodiments, the first circuit board 21 includes a first portion 211 and a second portion 212 and a third portion 213 connected to both ends of the first portion 211. The second portion 212 and the third portion 213 extend away from the battery cell 10 relative to the first portion 211. A first connector 22, a second connector 23, a third connector 24, a fourth connector 25, and a protection switch module 26 are disposed in the first portion 211. A first connector 31 is disposed in the second portion 212, and a second connector 23 is disposed in the third portion 213. The extension directions of the first branch 20A1 and the third branch 20B1 are parallel to the extension direction of the first portion 211, the extension direction of the second branch 20A2 is parallel to the extension direction of the second portion 212, and the extension direction of the fourth branch 20B2 is parallel to the extension direction of the third portion 213, so as to further shorten the length of the first line 20A and the second line 20B. It should be noted that the two ends of the first part 211 can be bent relative to the middle area, and the second part 212 and the third part 213 can also be bent relative to the first part 211.

[0098] Please see Figure 1 In some embodiments, the battery cell 10 includes a packaging bag 15, which includes a main body 151 and an encapsulation portion 152. The packaging bag 15 is made of an encapsulation film by perforation, folding, and heat sealing. The main body 151 is the portion of the encapsulation film with perforations, and the encapsulation portion 152 is the portion of the encapsulation film that overlaps and joins. The main body 151 includes a top wall 1511, and the encapsulation portion 152 includes a top sealing portion 1521 connected to the top wall 1511. A first tab 11, a second tab 12, a third tab 13, and a fourth tab 14 extend from the top sealing portion 1521. A circuit board assembly 20 is disposed on the top wall 1511.

[0099] In some embodiments, the top seal 1521 is bent toward the top wall 1511, and the circuit board assembly 20 is disposed on the side of the top seal 1521 away from the top wall 1511, so as to reduce the space waste generated by the circuit board assembly 20 at the head of the battery 100A and improve the energy density of the battery 100A.

[0100] Please see Figure 3 In some embodiments, the battery 100A includes an injection-molded part 40 connected to a top wall 1511 and enclosing a top seal 1521. The first circuit board 21 includes a base 21A and a bent portion 21B. The base 21A is located within the injection-molded part 40, and the bent portion 21B extends out of the injection-molded part 40 and is bent towards the base 21A away from the top wall 1511. The injection-molded part 40 can improve the structural stability of the battery 100A head.

[0101] Optionally, the injection molded part 40 is formed in a designated area by melting and solidifying the injection molding material using injection molding equipment.

[0102] In some embodiments, the injection molded part 40 has a recess 41 on the side away from the top wall 1511, and at least a portion of the bent part 21B is located in the recess 41. The bent part 21B and the injection molded part 40 share the space in the thickness direction of the injection molded part 40 to reduce the space waste generated by the bent part 21B at the head of the battery 100A and improve the energy density of the battery 100A.

[0103] In some embodiments, the injection molded part 40 has a clearance portion 42 on the side away from the top wall 1511. The clearance portion 42 is located on one side of the recess 41 along the first direction X, forming a sunken space. The bending portion 21B includes a first sub-bending portion 21B1 and a second sub-bending portion 21B2. The second sub-bending portion 21B2 is located on the side of the base 21A away from the top wall 1511, and the first sub-bending portion 21B1 is located between the base 21A and the second sub-bending portion 21B2. At least a portion of the first sub-bending portion 21B1 is located within the recess 41, and at least a portion of the second sub-bending portion 21B2 is located within the clearance portion 42, to further reduce the space waste generated by the bending portion 21B at the head of the battery 100A and improve the energy density of the battery 100A.

[0104] In some embodiments, the recessed depth of the clearance portion 42 is 0.1 mm to 1.5 mm along the arrangement direction of the injection molded part 40 and the cell 10, so as to improve the structural stability of the head of the battery 100 and facilitate the accommodation of the second sub-bend portion 21B2.

[0105] Optionally, the sinking depth of the clearance portion 42 is one of 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, or any other value within the range of 0.1mm to 1.5mm.

[0106] Please see Figure 4 In some embodiments, the battery 100A includes a first protection device 50 connected to a first circuit board 21, and the first protection device 50 is configured to form a protection circuit for protecting the battery cell 10.

[0107] In some embodiments, the first protection device 50 is a System in Package (SIP) module formed using a SIP packaging process. A SIP module integrates multiple functional devices (such as processors, memory, sensors, etc.) into a single package, achieving higher integration and smaller size by combining devices with different processes and functions. The first protection device 50 includes a first PCB board 51, a first electronic component 52, and an injection molding portion 53. The first PCB board 51 is connected to the first circuit board 21, and the injection molding portion 53 covers the side of the first PCB board 51 away from the first circuit board 21. The first electronic component 52 is located within the injection molding portion 53 and is electrically connected to the first PCB board 51. The first protection device 50 can improve the structural strength of the first circuit board 21, facilitating a reduction in the thickness of the first circuit board 21, thereby improving the energy density of the 100A battery.

[0108] Example 2

[0109] Please see Figure 5 An embodiment of this application also provides a battery 100B, which differs from battery 100A in the number and structure of connectors.

[0110] The circuit board assembly 20 includes a third connector 33 connected to the first circuit board 21. The third connector 33 has a first connection terminal 331 and a second connection terminal 332 with opposite polarities. The first connection terminal 331 and the second connection terminal 332 are configured to be connected to an external circuit, respectively. The external circuit may be, but is not limited to, a mainboard electrically connected to the battery 100B.

[0111] The first connection terminal 331 is connected in series with the first branch 20A1 to shorten the length of the first line 20A, which helps to reduce impedance and temperature rise. The second connection terminal 332 is connected in series with the third branch 20B1 to shorten the length of the second line 20B, which helps to reduce impedance and temperature rise.

[0112] In some embodiments, the first circuit board 21 includes a first portion 211 and a second portion 212 connected to one end of the first portion 211, the second portion 212 extending away from the battery cell 10 relative to the first portion 211. A first connector 22, a second connector 23, a third connector 24, a fourth connector 25, and a protection switch module 26 are disposed in the first portion 211, and a third connector 3331 is disposed in the second portion 212. The extension direction of the first branch 20A1 located in the first portion 211 is parallel to the extension direction of the first portion 211, and the extension direction of the first branch 20A1 located in the second portion 212 is parallel to the extension direction of the second portion 212, to further shorten the length of the first line 20A. The extension direction of the third branch 20B1 located in the first portion 211 is parallel to the extension direction of the first portion 211, and the extension direction of the third branch 20B1 located in the second portion 212 is parallel to the extension direction of the second portion 212, to further shorten the length of the second line 20B. It should be noted that the end of the first part 211 can be bent relative to the middle area, and the second part 212 can also be bent relative to the first part 211.

[0113] 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.

[0114] Example 3

[0115] Please see Figure 6 An embodiment of this application also provides a battery 100C, which differs from battery 100A in the arrangement of its tabs.

[0116] The battery cell 10 includes a first tab 11, a second tab 12, a third tab 13, and a fourth tab 14 arranged sequentially along a first direction X. The polarity of the first tab 11 is opposite to that of the second tab 12, the polarity of the third tab 13 is opposite to that of the fourth tab 14, and the polarity of the second tab 12 is the same as that of the third tab 13. The first tab 11, the second tab 12, the third tab 13, and the fourth tab 14 are used for electrical connection with the circuit board assembly 20 to form a complete current loop.

[0117] Optionally, the polarity of the first electrode 11 and the fourth electrode 14 are positive, and the polarity of the second electrode 12 and the third electrode 13 are negative; or the polarity of the first electrode 11 and the fourth electrode 14 are negative, and the polarity of the second electrode 12 and the third electrode 13 are positive.

[0118] First connector 22, second connector 23, third connector 24, and fourth connector 25 are arranged sequentially along the first direction X on the first circuit board 21. First connector 22 is connected to first tab 11, second connector 23 is connected to second tab 12, third connector 24 is connected to third tab 13, and fourth connector 25 is connected to fourth tab 14.

[0119] The first circuit board 21 integrates a first line 20A, a second line 20B, a third line 20C, and a fourth line 20D. The first line 20A connects to the first connector 22, the second line 20B connects to the fourth connector 25, the third line 20C connects to the second connector 23 via a protection switch module 26, and the fourth line 20D connects to the third connector 24 via the protection switch module 26. This simplifies the electrical connection lines of the first circuit board 21, disperses the current transmission path, and reduces impedance and temperature rise. This eliminates the need for additional layers to thicken or widen the first circuit board 21, reducing space waste on the side of the circuit board assembly 20 near the cell 10 and improving the energy density of the battery 100C.

[0120] In some embodiments, the number of protection switch modules 26 is one and it is disposed between the second connector 23 and the third connector 24 along the first direction X to facilitate the installation of the components.

[0121] In some embodiments, the circuit board assembly 20 includes two fourth connectors 34 connected to the first circuit board 21. Each fourth connector 34 has a first connection terminal 341 and a second connection terminal 342 with opposite polarities. The first connection terminal 341 and the second connection terminal 342 are configured to be connected to an external circuit, respectively. The external circuit may be, but is not limited to, a motherboard electrically connected to the battery 100C.

[0122] The first line 20A and the third line 20C are connected to one of the fourth connectors 34. The first line 20A is connected in series with the first connector 22 and the first connector terminal 341. The third line 20C is connected to the second connector terminal 342 in order to shorten the length of the first line 20A, which helps to reduce impedance and temperature rise.

[0123] The second line 20B and the fourth line 20D are connected to another fourth connector 34. The second line 20B is connected in series with the fourth connector 25 and the first connector terminal 341. The fourth line 20D is connected to the second connector terminal 342, so as to shorten the length of the second line 20B, which helps to reduce impedance and temperature rise.

[0124] In some embodiments, the third line 20C and the fourth line 20D are negative circuits to adapt to the reference ground of the battery management chip, eliminating the need for additional isolation or level conversion circuits, thereby simplifying electrical connection lines and reducing production costs.

[0125] 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.

[0126] Example 4

[0127] Please see Figure 7 An embodiment of this application also provides a battery 100D, which differs from battery 100C in that the structure of the circuit board is different.

[0128] The first circuit board 21 includes a first sub-board 21C and a second sub-board 21D, which are separately configured. The first sub-board 21C includes a first connector 22, a second connector 23, a fourth connector 34, and a protection switch module 26. The first sub-board 21C integrates a first circuit 20A and a third circuit 20C. The second sub-board 21D includes a third connector 24, a fourth connector 25, a fourth connector 34, and a protection switch module 26. The second sub-board 21D integrates a second circuit 20B and a fourth circuit 20D. The separate configuration of the first sub-board 21C and the second sub-board 21D helps reduce temperature rise.

[0129] In some embodiments, the polarity of the first tab 11 and the fourth tab 14 are positive, and the polarity of the second tab 12 and the third tab 13 are negative. The third line 20C and the fourth line 20D are negative circuits to adapt to the reference ground of the battery management chip, eliminating the need for additional isolation or level conversion circuits, thereby simplifying electrical connection lines and reducing production costs.

[0130] Please see Figure 8 In some embodiments, the polarity of the first tab 11 and the fourth tab 14 are negative, and the polarity of the second tab 12 and the third tab 13 are positive. The first line 20A and the second line 20B are negative circuits. The protection switch module 26 is disposed on the first line 20A and the second line 20B to adapt to the reference ground of the battery management chip, eliminating the need for additional isolation or level conversion circuits, thereby simplifying the electrical connection lines and reducing production costs.

[0131] Apart from the differences mentioned above, the parameters of battery 100D and battery 100C are roughly the same. Please refer to the description of battery 100C above.

[0132] Example 5

[0133] Please see Figure 9 An embodiment of this application also provides a battery 100E, which differs from battery 100D in the arrangement of its tabs.

[0134] The polarity of the first electrode 11 is opposite to that of the second electrode 12, the polarity of the third electrode 13 is opposite to that of the fourth electrode 14, and the polarity of the second electrode 12 is opposite to that of the third electrode 13.

[0135] The first sub-board 21C includes a first connector 22, a second connector 23, a fourth connector 34, and a protection switch module 26. The first sub-board 21C integrates a first line 20A and a third line 20C. The first line 20A and the third line 20C are connected to the corresponding fourth connector 34. The first line 20A is connected in series with the first connector 22 and the first connection terminal 341, and the third line 20C is connected to the second connection terminal 342.

[0136] The second sub-board 21D is provided with a third connector 24, a fourth connector 25, a fourth connector 34, and a protection switch module 26. The second sub-board 21D integrates a second line 20B and a fourth line 20D. The second line 20B and the fourth line 20D are connected to the corresponding fourth connector 34. The second line 20B is connected in series with the fourth connector 25 and the second connection terminal 342, and the fourth line 20D is connected to the first connection terminal 341.

[0137] In some embodiments, the polarity of the first tab 11 and the third tab 13 are negative, and the polarity of the second tab 12 and the fourth tab 14 are positive. The first line 20A and the fourth line 20D are negative circuits. The protection switch module 26 is disposed on the first line 20A and the fourth line 20D to adapt to the reference ground of the battery management chip, eliminating the need for additional isolation or level conversion circuits, thereby simplifying the electrical connection lines and reducing production costs.

[0138] Apart from the differences mentioned above, the parameters of battery 100E and battery 100D are roughly the same, and can be found in the description of battery 100C above.

[0139] Example 6

[0140] Please see Figure 10 An embodiment of this application also provides a terminal device 200, including the battery (100A, 100B, 100C, 100D, 100E) in any of the above embodiments.

[0141] 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.

[0142] In some embodiments, the terminal device 200 includes a motherboard (not shown) and a second protection device (not shown). Batteries (100A, 100B, 100C, 100D, 100E) are electrically connected to the motherboard, and the second protection device is electrically connected to both the batteries (100A, 100B, 100C, 100D, 100E) and the motherboard. The second protection device is located on the motherboard and is configured to form a protection circuit for the battery cell 10. The second protection device can replace the first protection device 50 to reduce the space wastage caused by placing the protection device at the head of the batteries (100A, 100B, 100C, 100D, 100E), which is beneficial to improving the energy density of (100A, 100B, 100C, 100D, 100E).

[0143] In summary, the different polarity arrangements of the first tab 11, second tab 12, third tab 13, and fourth tab 14 in the batteries (100A, 100B, 100C, 100D, 100E) and terminal device 200 can simplify the electrical connection lines of the first circuit board 21, disperse the current transmission path, and reduce impedance and temperature rise. This eliminates the need for additional layering or widening of the first circuit board 21, which helps reduce the space wastage of the circuit board assembly 20 on the cell 10 side and improves the energy density of the batteries (100A, 100B, 100C, 100D, 100E).

[0144] 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, comprising a cell, the cell including a first tab, a second tab, a third tab, and a fourth tab arranged sequentially along a first direction, the first direction being perpendicular to the thickness direction of the battery, characterized in that, The first electrode has the same polarity as the second electrode, the third electrode has the same polarity as the fourth electrode, the second electrode has the opposite polarity to the third electrode, and the battery includes a circuit board assembly, which includes a first circuit board, a first connector, a second connector, a third connector, a fourth connector, and a protection switch module. The first connector, the second connector, the third connector, and the fourth connector are arranged sequentially on the first circuit board along the first direction. The first connector is connected to the first electrode tab, the second connector is connected to the second electrode tab, the third connector is connected to the third electrode tab, and the fourth connector is connected to the fourth electrode tab. The first circuit board integrates a first line and a second line. The first line includes a first branch connected in series with the first connector and the second connector. The second line includes a third branch connected in series with the third connector and the fourth connector. The protection switch module is connected in series with the first branch or the third branch.

2. The battery as described in claim 1, characterized in that, The circuit board assembly includes a first connector and a second connector connected to the first circuit board. The first connector has two first connection terminals with the same polarity, and the second connector has two second connection terminals with the same polarity. The first line includes two second branches, and the two first connection terminals are connected in parallel to the first branch through the two second branches. The second line includes two fourth branches, and the two second connection terminals are connected in parallel to the third branch through the two fourth branches. The first connection terminals and the second connection terminals are configured to be connected to external circuits respectively.

3. The battery as described in claim 1, characterized in that, The circuit board assembly includes a third connector connected to the first circuit board. The third connector has a first connection terminal and a second connection terminal with opposite polarities. The first connection terminal is connected in series with the first branch, and the second connection terminal is connected in series with the third branch. The first connection terminal and the second connection terminal are configured to be connected to an external circuit, respectively.

4. A battery, comprising a cell, the cell including a first tab, a second tab, a third tab, and a fourth tab arranged sequentially along a first direction, the first direction being perpendicular to the thickness direction of the battery, characterized in that, The polarity of the first electrode tab is opposite to that of the second electrode tab, the polarity of the third electrode tab is opposite to that of the fourth electrode tab, the polarity of the second electrode tab is the same as that of the third electrode tab, and the battery includes a circuit board assembly, which includes a first circuit board, a first connector, a second connector, a third connector, a fourth connector, and a protection switch module. The first connector, the second connector, the third connector, and the fourth connector are arranged sequentially on the first circuit board along the first direction. The protection switch module is located between the second connector and the third connector. The first connector is connected to the first tab, the second connector is connected to the second tab, the third connector is connected to the third tab, and the fourth connector is connected to the fourth tab. The first circuit board integrates a first line, a second line, a third line, and a fourth line. The first line is connected to the first connector, the second line is connected to the fourth connector, the third line is connected to the second connector through a protection switch module, and the fourth line is connected to the third connector through a protection switch module.

5. The battery as described in claim 4, characterized in that, The circuit board assembly includes two fourth connectors connected to the first circuit board. Each fourth connector has a first connection terminal and a second connection terminal with opposite polarities. A first line and a third line are connected to one of the fourth connectors. The first line is connected in series with the first connector and the first connection terminal. The third line is connected to the second connection terminal. The second line and the fourth line are connected to the other fourth connector. The second line is connected in series with the fourth connector and the first connection terminal. The fourth line is connected to the second connection terminal. The first connection terminal and the second connection terminal are configured to be connected to external circuits, respectively.

6. The battery as described in claim 5, characterized in that, The first circuit board includes a first sub-board and a second sub-board that are separately disposed; The first sub-board is provided with the first connector, the second connector, a fourth connector, and a protection switch module. The first sub-board integrates the first circuit and the third circuit. The second sub-board is provided with the third connector, the fourth connector, a fourth connector, and a protection switch module. The second sub-board integrates the second circuit and the fourth circuit.

7. The battery according to any one of claims 1 to 6, characterized in that, The battery cell includes a packaging bag, the packaging bag includes a main body and a packaging part, the main body includes a top wall, the packaging part includes a top sealing part connected to the top wall, the first electrode, the second electrode, the third electrode and the fourth electrode extend from the top sealing part, and the circuit board assembly is disposed on the top wall; The battery includes an injection molded part connected to the top wall and enclosing the top seal. The first circuit board includes a base and a bent portion. The base is located inside the injection molded part, and the bent portion extends out of the injection molded part and bends toward the base on the side away from the top wall.

8. The battery as claimed in claim 7, characterized in that, The injection molded part has a recess on the side away from the top wall, and at least a portion of the bent portion is located within the recess.

9. The battery according to any one of claims 1 to 6, characterized in that, The battery includes a first protection device connected to the first circuit board. The first protection device includes a first PCB board, a first electronic component, and an injection molding part. The first PCB board is connected to the first circuit board, and the injection molding part covers the side of the first PCB board away from the first circuit board. The first electronic component is located in the injection molding part and is electrically connected to the first PCB board.

10. A terminal device, characterized in that, The terminal device includes a battery as described in any one of claims 1 to 9.

11. A terminal device, characterized in that, The terminal device includes a motherboard, a second protection device, and a battery as described in any one of claims 1 to 8, wherein the battery is electrically connected to the motherboard, and the second protection device is electrically connected to both the battery and the motherboard.

Images