A battery pack protection circuit

Abstract

The embodiment of the present application discloses a battery pack protection circuit. The battery pack protection circuit comprises a protection chip, a protection switch module, a plurality of string number selection modules and a plurality of battery strings, the battery strings are connected in a loop, the protection switch module and the string number selection modules are electrically connected to the battery, the string number selection modules and the protection switch module are electrically connected to the protection chip; wherein the number of the plurality of string number selection modules is greater than the number of the plurality of battery strings, at least one string of battery is connected with a string number selection module, the protection chip detects the parameters of the battery connected with the protection chip according to the on-off state of the plurality of string number selection modules, and controls the on-off of the protection switch module according to the parameters. The battery pack protection circuit provided by the embodiment of the present application can realize the protection of the battery with different string numbers, and improve the versatility of the battery pack protection circuit.

Description

Technical Field

[0001] This invention relates to battery technology, and more particularly to a battery pack protection circuit. Background Technology

[0002] Currently, system solutions for 3C audio products, small power tools, balance scooters, and small electric-assist scooters typically require battery packs with 2 to 5 or higher cell counts, such as lithium-ion battery packs. These battery packs need to have built-in protection circuitry to protect the batteries from external abnormalities such as overvoltage, overcurrent, undervoltage, overtemperature, and short circuits.

[0003] Currently, existing battery pack protection circuits typically protect a fixed number of batteries. The specific structure of the protection circuit needs to be determined based on the number of batteries, such as the number of battery strings. This makes protection schemes for multiple battery strings with different string numbers incompatible and results in poor versatility. Summary of the Invention

[0004] This invention provides a battery pack protection circuit to protect batteries with different numbers of cells in series, thereby improving the versatility of the battery pack protection circuit.

[0005] This invention provides a battery pack protection circuit, including: a protection chip, a protection switch module, multiple series number selection modules, and multiple battery strings connected end to end. The protection switch module and the series number selection module are both electrically connected to the battery, and the series number selection module and the protection switch module are both electrically connected to the protection chip.

[0006] The number of multiple string selection modules is greater than the number of multiple batteries. At least one string of batteries is connected to a string selection module at both ends. The protection chip detects the parameters of the batteries connected to the protection chip based on the on / off status of the multiple string selection modules, and controls the on / off state of the protection switch module according to the parameters.

[0007] Optionally, the multi-cell battery includes a first cell, a second cell, a third cell, a fourth cell, and a fifth cell connected in sequence, and the cell number selection module includes a first cell number selection module to a thirteenth cell number selection module.

[0008] The first battery string has two ends electrically connected to the fourth battery string selection module. The end connecting the first and second battery strings is electrically connected to the first voltage output pin of the protection chip via the fifth battery string selection module. The end connecting the second and third battery strings is electrically connected to the second voltage output pin of the protection chip via the eighth battery string selection module. The end connecting the fifth and fourth battery strings is electrically connected to the positive voltage output pin of the protection chip via the second battery string selection module. The two ends of the fifth battery string are electrically connected to the third battery string selection module. The end of the fifth battery string furthest from the fourth battery string is electrically connected to the positive voltage output pin via the first battery string selection module. The second battery string furthest from the first battery string... One end of the first battery string is electrically connected to the end of the second battery string away from the first battery string through the seventh battery string selection module. The first voltage output pin is electrically connected to the negative voltage output pin of the protection chip through the sixth battery string selection module. The second voltage output pin is electrically connected to the negative voltage output pin through the ninth battery string selection module. The first switching pin of the protection chip is electrically connected to the positive voltage output pin through the tenth battery string selection module. The first switching pin is electrically connected to the negative voltage output pin through the eleventh battery string selection module. The second switching pin of the protection chip is electrically connected to the positive voltage output pin through the twelfth battery string selection module. The second switching pin is electrically connected to the negative voltage output pin through the thirteenth battery string selection module.

[0009] The control terminal of the protection switch module is electrically connected to the control signal output pin of the protection chip. The first terminal of the protection switch module is electrically connected to the end of the first battery string that is furthest from the second battery string. The second terminal of the protection switch module serves as the negative output terminal of the battery pack protection circuit. The end of the fifth battery string that is furthest from the fourth battery string serves as the positive output terminal of the battery pack protection circuit.

[0010] Optionally, the protection switch module includes a first MOSFET and a second MOSFET. The gates of the first MOSFET and the second MOSFET are electrically connected to the two control signal output pins of the protection chip, respectively. The first terminal of the first MOSFET is electrically connected to the first terminal of the second MOSFET. The second terminal of the second MOSFET serves as the first terminal of the protection switch module, and the second terminal of the first MOSFET serves as the second terminal of the protection switch module.

[0011] Optionally, the first, fifth, eighth, tenth, and twelfth string selection modules are all turned on, and the first, second, third, fourth, and fifth string batteries are all connected to the circuit.

[0012] Optionally, the second, third, fifth, eighth, tenth, and thirteenth string selection modules are all turned on, and the first, second, third, and fourth string batteries are all connected to the circuit.

[0013] Optionally, the second, third, fourth, sixth, eighth, eleventh, and twelfth string selection modules are all turned on, and the second, third, and fourth string batteries are all connected to the circuit.

[0014] Optionally, the second, third, sixth, seventh, ninth, eleventh, and thirteenth string selection modules are all turned on, and the third and fourth string batteries are connected to the circuit.

[0015] Optionally, the number of strings selection module includes at least one of solder joints, nickel strip joints, electronic switches, mechanical switches, and control switches.

[0016] Optionally, a Zener diode is also included, which protects the positive and negative voltage output pins of the chip by electrically connecting them.

[0017] Optionally, it may also include multiple resistors and multiple capacitors, all of which are electrically connected to the protection chip.

[0018] The battery pack protection circuit provided in this embodiment of the invention includes: a protection chip, a protection switch module, multiple series number selection modules, and multiple battery strings. The multiple battery strings are connected end-to-end. Both the protection switch module and the series number selection module are electrically connected to the battery strings, and both the series number selection module and the protection switch module are electrically connected to the protection chip. The number of series number selection modules is greater than the number of battery strings. At least one battery string has a series number selection module connected to both ends. The protection chip detects the parameters of the battery connected to the protection chip based on the on / off states of the multiple series number selection modules, and controls the on / off state of the protection switch module according to the parameters. In this battery pack protection circuit, the on / off state of the series number selection modules can be changed or controlled, thereby changing the on / off state of the path containing the battery connected to the protection chip, to achieve protection for batteries with different series numbers, and improve the versatility of the battery pack protection circuit. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a battery pack protection circuit provided in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of a battery pack protection circuit for protecting five-cell batteries according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of a battery pack protection circuit for protecting four-cell batteries according to an embodiment of the present invention;

[0022] Figure 4This is a schematic diagram of a battery pack protection circuit for protecting three-cell batteries according to an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of a battery pack protection circuit for protecting two battery cells according to an embodiment of the present invention;

[0024] Figure 6 This is a structural block diagram of a battery pack protection circuit and its connection to a battery, provided in an embodiment of the present invention. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0026] Figure 1 This is a schematic diagram of a battery pack protection circuit provided in an embodiment of the present invention. The battery pack protection circuit includes: a protection chip 10, a protection switch module 20, multiple series number selection modules 30 and multiple series batteries 40. The multiple series batteries 40 are connected end to end. The protection switch module 20 and the series number selection module 30 are both electrically connected to the batteries 40. The series number selection module 30 and the protection switch module 20 are both electrically connected to the protection chip 10.

[0027] The number of multiple string selection modules 30 is greater than the number of multiple batteries 40. At least one string of batteries 40 is connected to both ends of a string selection module 30. The protection chip 10 detects the parameters of the batteries 40 connected to the protection chip 10 according to the on / off status of the multiple string selection modules 30, and controls the on / off state of the protection switch module 20 according to the parameters.

[0028] Specifically, the total number of serial number selection modules 30 is greater than the total number of serial connections of batteries 40. Batteries 40 can be connected to external circuits via protection switch module 20. Protection chip 10 can determine the continuity of the path containing batteries 40 connected to protection chip 10 based on the on / off state of serial number selection modules 30, and detect parameters of batteries 40 connected to protection chip 10, such as voltage, current, and temperature. If the specific values ​​of the detected parameters exceed a preset threshold corresponding to the number of batteries 40 connected to protection chip 10, then protection switch module 20 is controlled to disconnect, protecting batteries 40. The on / off state of serial number selection modules 30 can be changed or controlled, thereby changing the continuity of the path containing batteries 40 connected to protection chip 10 to achieve protection for batteries 40 with different serial numbers.

[0029] The battery pack protection circuit provided in this embodiment includes: a protection chip, a protection switch module, multiple series number selection modules, and multiple battery strings. The battery strings are connected end-to-end. Both the protection switch module and the series number selection module are electrically connected to the battery strings, and both are electrically connected to the protection chip. The number of series number selection modules is greater than the number of battery strings. At least one battery string has a series number selection module connected to both ends. The protection chip detects the parameters of the battery connected to it based on the on / off states of the multiple series number selection modules and controls the on / off state of the protection switch module according to these parameters. In this embodiment, the on / off state of the series number selection modules is changeable or controllable, thereby changing the on / off state of the path containing the battery connected to the protection chip to achieve protection for batteries with different series numbers.

[0030] refer to Figure 1Optionally, the multi-cell battery 40 includes a first cell BAT1, a second cell BAT2, a third cell BAT3, a fourth cell BAT4, and a fifth cell BAT5 connected in sequence. The cell number selection module 30 includes a first cell number selection module Trip1 to a thirteenth cell number selection module Trip13. The two ends of the first cell BAT1 are electrically connected to the fourth cell number selection module Trip4. One end of the first cell BAT1 connected to the second cell BAT2 is electrically connected to the first voltage output pin V1 of the protection chip 10 through the fifth cell number selection module Trip5. The second cell BAT2 is connected to the third cell BAT3. One end of the battery is electrically connected to the second voltage output pin V2 of the protection chip 10 via the eighth string selection module Trip8. The end connecting the fifth battery BAT5 and the fourth battery BAT4 is electrically connected to the positive voltage output pin VDD of the protection chip 10 via the second string selection module Trip2. Both ends of the fifth battery BAT5 are electrically connected to the third string selection module Trip3. The end of the fifth battery BAT5 furthest from the fourth battery BAT4 is electrically connected to the positive voltage output pin VDD via the first string selection module Trip1. The end of the second battery BAT2 furthest from the first battery BAT1 is connected to the end of the first battery BAT1 furthest from the first battery BAT1. One end of the second battery string BAT2 is electrically connected to the seventh string number selection module Trip7. The first voltage output pin and the negative voltage output pin VSS of the protection chip 10 are electrically connected to the sixth string number selection module Trip6. The second voltage output pin V2 and the negative voltage output pin VSS are electrically connected to the ninth string number selection module Trip9. The first switching pin SEL1 of the protection chip 10 is electrically connected to the positive voltage output pin VDD through the tenth string number selection module Trip10. The first switching pin SEL1 is also electrically connected to the negative voltage output pin VSS through the eleventh string number selection module Trip11. The second switching pin S... EL2 is electrically connected to the positive voltage output pin VDD through the twelfth string number selection module Trip12, and the second switching pin SEL2 is electrically connected to the negative voltage output pin VSS through the thirteenth string number selection module Trip13. The control terminal of the protection switch module 20 is electrically connected to the control signal output pin of the protection chip 10. The first terminal of the protection switch module 20 is electrically connected to the end of the first string battery BAT1 that is away from the second string battery BAT2. The second terminal of the protection switch module 20 serves as the negative output terminal P- of the battery pack protection circuit, and the end of the fifth string battery BAT5 that is away from the fourth string battery BAT4 serves as the positive output terminal P+ of the battery pack protection circuit.

[0031] Specifically, such as Figure 1As shown, taking a five-cell battery as an example, the first cell BAT1 to the fifth cell BAT5 are all electrically connected to the protection chip 10 through the cell number selection module 30. The protection chip 10 determines the continuity of the path containing the battery 40 connected to it based on the on / off states of the first cell number selection module Trip1 to the thirteenth cell number selection module Trip13. It also detects the parameters of the battery 40 connected to the protection chip 10 and outputs the detected parameters of the battery 40, such as those from the first cell BAT1 to the fifth cell BAT5, through the positive output terminal P+ and the negative output terminal P- of the battery pack protection circuit. Based on the magnitude of these parameters, the protection switch module 20 is controlled to open or close, thereby protecting the battery 40 with different cell numbers.

[0032] It should be noted that, Figure 1 The five battery strings shown are for illustrative purposes only. The specific number of multiple battery strings (40) can be set according to actual protection needs and is not limited here.

[0033] Continue to refer to Figure 1 Optionally, the protection switch module 20 includes a first MOSFET Q1 and a second MOSFET Q2. The gates of the first MOSFET Q1 and the second MOSFET Q2 are electrically connected to the two control signal output pins CO and DO of the protection chip 10, respectively. The first terminal of the first MOSFET Q1 is electrically connected to the first terminal of the second MOSFET Q2. The second terminal of the second MOSFET Q2 serves as the first terminal of the protection switch module 20, and the second terminal of the first MOSFET Q1 serves as the second terminal of the protection switch module 20.

[0034] Specifically, the protection chip 10 can output a control signal through the control signal output pin, and control the on / off state of the corresponding MOSFET through the control signal. For example, if the voltage detected by the protection chip 10 exceeds the preset voltage threshold corresponding to the number of batteries 40 connected to the circuit at this time, the battery 40 may fail. At this time, the protection chip 10 can control at least one MOSFET in the protection switch module 20 to turn off, thereby disconnecting the battery 40 from the external circuit, protecting the battery 40 and preventing damage to the battery 40.

[0035] Optionally, the first string selection module Trip1, the fifth string selection module Trip5, the eighth string selection module Trip8, the tenth string selection module Trip10, and the twelfth string selection module Trip12 are all turned on, and the first string battery BAT1, the second string battery BAT2, the third string battery BAT3, the fourth string battery BAT4, and the fifth string battery BAT5 are all connected to the circuit.

[0036] For example, Figure 2 This is a schematic diagram of a battery pack protection circuit for protecting five cells in a series, provided in an embodiment of the present invention. (Reference) Figure 2When the first string selection module Trip1, the fifth string selection module Trip5, the eighth string selection module Trip8, the tenth string selection module Trip10, and the twelfth string selection module Trip12 are turned on, and the other string selection modules are turned off, the connection between the first string battery BAT1 to the fifth string battery BAT5 and the protection chip 10 is turned on. At this time, the protection chip 10 can control and protect the five strings of batteries.

[0037] Optionally, the second string selection module Trip2, the third string selection module Trip3, the fifth string selection module Trip5, the eighth string selection module Trip8, the tenth string selection module Trip10, and the thirteenth string selection module Trip13 are all turned on, and the first string battery BAT1, the second string battery BAT2, the third string battery BAT3, and the fourth string battery BAT4 are all connected to the circuit.

[0038] For example, Figure 3 This is a schematic diagram of a battery pack protection circuit for protecting four series batteries, provided in an embodiment of the present invention. (Reference) Figure 3 When the second string selection module Trip2, the third string selection module Trip3, the fifth string selection module Trip5, the eighth string selection module Trip8, the tenth string selection module Trip10, and the thirteenth string selection module Trip13 are turned on, and the other string selection modules are turned off, the connection between the first string battery BAT1 to the fourth string battery BAT4 and the protection chip 10 is turned on, and the connection between the fifth string battery BAT5 and the protection chip 10 is turned off. At this time, the protection chip 10 can control and protect the four strings of batteries.

[0039] Optionally, the second string selection module Trip2, the third string selection module Trip3, the fourth string selection module Trip4, the sixth string selection module Trip6, the eighth string selection module Trip8, the eleventh string selection module Trip11, and the twelfth string selection module Trip12 are all turned on, and the second string battery BAT2, the third string battery BAT3, and the fourth string battery BAT4 are all connected to the circuit.

[0040] For example, Figure 4 This is a schematic diagram of a battery pack protection circuit for protecting three-cell batteries according to an embodiment of the present invention. (Reference) Figure 4When the second string selection module Trip2, the third string selection module Trip3, the fourth string selection module Trip4, the sixth string selection module Trip6, the eighth string selection module Trip8, the eleventh string selection module Trip11, and the twelfth string selection module Trip12 are turned on, and the other string selection modules are turned off, the circuits connecting the second string battery BAT2, the third string battery BAT3, and the fourth string battery BAT4 to the protection chip 10 are all turned on, while the circuits connecting the first string battery BAT1 and the fifth string battery BAT5 to the protection chip 10 are turned off. At this time, the protection chip 10 can control and protect three strings of batteries. In addition, cascading multiple protection chips can protect more strings of batteries.

[0041] Optionally, the second string selection module Trip2, the third string selection module Trip3, the sixth string selection module Trip6, the seventh string selection module Trip7, the ninth string selection module Trip9, the eleventh string selection module Trip11, and the thirteenth string selection module Trip13 are all turned on, and the third string battery BAT3 and the fourth string battery BAT4 are connected to the circuit.

[0042] For example, Figure 5 This is a schematic diagram of a battery pack protection circuit for protecting two battery cells according to an embodiment of the present invention. (Reference) Figure 5 When the second string selection module Trip2, the third string selection module Trip3, the sixth string selection module Trip6, the seventh string selection module Trip7, the ninth string selection module Trip9, the eleventh string selection module Trip11, and the thirteenth string selection module Trip13 are turned on, and the other string selection modules are turned off, the circuits connecting the third string battery BAT3 and the fourth string battery BAT4 to the protection chip 10 are both turned on, and the circuits connecting the first string battery BAT1, the second string battery BAT2, and the fifth string battery BAT5 to the protection chip 10 are turned off. At this time, the protection chip 10 can control and protect the two strings of batteries.

[0043] Optionally, the battery string selection module 30 includes at least one of solder joints, nickel plate solder joints, electronic switches, mechanical switches, and control switches. The control switch can be a MOSFET. The protection chip 10 and the battery 40 can be connected via solder joints and / or nickel plate solder joints, or via a switch. When the protection chip 10 and the battery 40 are connected via the control switch, the on / off state of the control switch can be controlled by an external controller to adjust the number of battery strings connected to the circuit, thereby protecting batteries with different string numbers.

[0044] refer to Figure 5Optionally, the battery pack protection circuit also includes a Zener diode Z. The positive voltage output pin VDD and the negative voltage output pin VSS of the protection chip 10 are electrically connected through the Zener diode Z. This configuration can regulate the voltage between the positive voltage output pin VDD and the negative voltage output pin VSS of the protection chip 10, preventing the voltage from being too high or too low.

[0045] Optionally, the battery pack protection circuit also includes multiple resistors and multiple capacitors, all of which are electrically connected to the protection chip 10. Specifically, as shown... Figure 5 As shown, the protection chip 10 is connected to multiple capacitors and multiple resistors. The capacitors can be charged and discharged, and the resistors can divide the voltage in the circuit to prevent the voltage from being too high.

[0046] Figure 6 This is a structural block diagram of a battery pack protection circuit and its connection to a battery, provided in an embodiment of the present invention. (Refer to...) Figure 6 The battery pack protection board, or protection chip, can be connected to multiple battery cells, such as BAT1-BATN. The cell connection can be made using connectors / ribbon cables / FPCs / wires / soldering, laser / energy storage spot welding, etc.

[0047] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A battery pack protection circuit, characterized in that, include: The system includes a protection chip, a protection switch module, multiple series number selection modules, and multiple battery cells connected end-to-end. The protection switch module and the series number selection module are both electrically connected to the battery cells, and the series number selection module and the protection switch module are both electrically connected to the protection chip. The number of the plurality of string selection modules is greater than the number of the plurality of batteries. At least one string of batteries is connected to the string selection module at both ends. The protection chip detects the parameters of the battery connected to the protection chip according to the on / off state of the plurality of string selection modules, and controls the on / off state of the protection switch module according to the parameters. The multi-cell battery array includes a first cell, a second cell, a third cell, a fourth cell, and a fifth cell, which are connected in sequence. The cell number selection module includes a first cell number selection module to a thirteenth cell number selection module. One end of the first cell and the second cell are connected to the first voltage output pin of the protection chip through the fifth cell number selection module. One end of the second cell and the third cell are connected to the second voltage output pin of the protection chip through the eighth cell number selection module. The end of the fifth cell away from the fourth cell is connected to the positive voltage output pin of the protection chip through the first cell number selection module.

2. The battery pack protection circuit according to claim 1, characterized in that, The first battery string has two ends electrically connected to the fourth battery string selection module. The fifth battery string has one end connected to the fourth battery string and is electrically connected to the positive voltage output pin of the protection chip via the second battery string selection module. The fifth battery string has two ends electrically connected to the third battery string selection module. The second battery string has one end away from the first battery string and the first battery string has one end away from the second battery string via the seventh battery string selection module. The first voltage output pin and the negative voltage output pin of the protection chip are electrically connected via the sixth battery string selection module. The second voltage output pin and the negative voltage output pin are electrically connected via the ninth battery string selection module. The first switching pin of the protection chip is electrically connected to the positive voltage output pin via the tenth battery string selection module. The first switching pin is electrically connected to the negative voltage output pin via the eleventh battery string selection module. The second switching pin of the protection chip is electrically connected to the positive voltage output pin via the twelfth battery string selection module. The second switching pin is electrically connected to the negative voltage output pin via the thirteenth battery string selection module. The control terminal of the protection switch module is electrically connected to the control signal output pin of the protection chip. The first terminal of the protection switch module is electrically connected to the end of the first battery string away from the second battery string. The second terminal of the protection switch module serves as the negative output terminal of the battery pack protection circuit. The end of the fifth battery string away from the fourth battery string serves as the positive output terminal of the battery pack protection circuit.

3. The battery pack protection circuit according to claim 2, characterized in that, The protection switch module includes a first MOSFET and a second MOSFET. The gates of the first MOSFET and the second MOSFET are electrically connected to two control signal output pins of the protection chip, respectively. The first terminal of the first MOSFET is electrically connected to the first terminal of the second MOSFET. The second terminal of the second MOSFET serves as the first terminal of the protection switch module, and the second terminal of the first MOSFET serves as the second terminal of the protection switch module.

4. The battery pack protection circuit according to claim 2, characterized in that, The first string selection module, the fifth string selection module, the eighth string selection module, the tenth string selection module, and the twelfth string selection module are all turned on, and the first string of batteries, the second string of batteries, the third string of batteries, the fourth string of batteries, and the fifth string of batteries are all connected to the circuit.

5. The battery pack protection circuit according to claim 2, characterized in that, The second string selection module, the third string selection module, the fifth string selection module, the eighth string selection module, the tenth string selection module, and the thirteenth string selection module are all turned on, and the first string of batteries, the second string of batteries, the third string of batteries, and the fourth string of batteries are all connected to the circuit.

6. The battery pack protection circuit according to claim 2, characterized in that, The second string selection module, the third string selection module, the fourth string selection module, the sixth string selection module, the eighth string selection module, the eleventh string selection module, and the twelfth string selection module are all turned on, and the second string of batteries, the third string of batteries, and the fourth string of batteries are all connected to the circuit.

7. The battery pack protection circuit according to claim 2, characterized in that, The second string selection module, the third string selection module, the sixth string selection module, the seventh string selection module, the ninth string selection module, the eleventh string selection module, and the thirteenth string selection module are all turned on, and the third string of batteries and the fourth string of batteries are connected to the circuit.

8. The battery pack protection circuit according to claim 1, characterized in that, The serial number selection module includes at least one of solder joints, nickel strip joints, electronic switches, mechanical switches, and control switches.

9. The battery pack protection circuit according to claim 1, characterized in that, It also includes a Zener diode, through which the positive voltage output pin and the negative voltage output pin of the protection chip are electrically connected.

10. The battery pack protection circuit according to claim 1, characterized in that, It also includes multiple resistors and multiple capacitors, all of which are electrically connected to the protection chip.

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