Battery equalization protection circuit and battery management system

Abstract

The utility model discloses a battery equalization protection circuit and a battery management system, and belongs to the technical field of batteries. The equalization protection circuit comprises an acquisition unit, an equalization unit and a filtering unit, the acquisition unit is provided with a plurality of equalization ends, and any two adjacent equalization ends are used for being connected to the two ends of a corresponding equalization switch; the equalization unit comprises equalization modules in one-to-one correspondence with the equalization ends, and any two adjacent equalization ends are connected to the two ends of the corresponding battery through the corresponding equalization modules so as to form an equalization loop with the corresponding battery; the filtering unit comprises filtering modules in one-to-one correspondence with the balancing loops, each filtering module is provided with a first end and a second end, and the first end and the second end are connected with the two balancing ends in the corresponding balancing loop respectively. According to the invention, the filtering unit is connected to the equalization loop, so that the voltage between the two adjacent equalization ends of the acquisition unit is filtered and suppressed, and the impact damage of high voltage to the acquisition unit is avoided.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery equalization protection circuit and a battery management system. Background Technology

[0002] The data acquisition unit in the battery management system has functions such as collecting battery voltage and providing a battery equalization channel; however, during battery charging, if an insulation abnormality occurs between the charging device and the ground, high voltage may be directly input into the battery, which in turn affects the data acquisition unit connected to the battery and causes damage to the data acquisition unit. Utility Model Content

[0003] The purpose of this application is to provide a battery equalization protection circuit that solves the technical problem that, during battery charging, when an insulation abnormality occurs between the charging device and ground, high voltage can affect the acquisition unit connected to the battery, causing damage to the acquisition unit. Another purpose of this application is to provide a battery management system.

[0004] Technical solution: This application provides a battery equalization protection circuit, including:

[0005] The acquisition unit has multiple equalization terminals, and any two adjacent equalization terminals are used to connect to the two ends of the corresponding equalization switch.

[0006] The equalization unit includes equalization modules that correspond one-to-one with each equalization terminal. Any two adjacent equalization terminals are connected to the two ends of the corresponding battery through the corresponding equalization modules to form an equalization loop with the corresponding battery.

[0007] The filtering unit includes filtering modules that correspond one-to-one with each equalization circuit. Each filtering module has a first terminal and a second terminal, which are respectively connected to two equalization terminals in the corresponding equalization circuit.

[0008] In some embodiments, the filtering module includes a filtering device and a voltage regulator connected in parallel. One end of the filtering device is connected to a first terminal via one end of the voltage regulator, and the other end of the filtering device is connected to a second terminal via another end of the voltage regulator. In this embodiment, one end of the filtering device is connected to a corresponding equalization terminal via one end of the voltage regulator, and the other end of the filtering device is connected to a corresponding equalization terminal via another end of the voltage regulator.

[0009] In some embodiments, the equalization module includes at least one resistor connected in series, and in the case of multiple filtering modules, the two ends of each filtering device are connected to the corresponding resistor respectively.

[0010] In some embodiments, the battery equalization protection circuit further includes:

[0011] The first protection unit includes multiple first high-frequency suppression interference devices that correspond one-to-one with the equalization circuit. The first high-frequency suppression interference devices are connected between the positive terminal of the battery and the corresponding equalization module.

[0012] In some embodiments, the batteries in each equalization circuit are connected in series to form a battery pack. The battery pack has a third terminal, which is connected to the positive terminal of the first battery in the battery pack for inputting the charging voltage of the battery pack.

[0013] The acquisition unit also has a power supply terminal, which is used to input the power supply voltage to the acquisition unit;

[0014] The battery equalization protection circuit also includes: a second protection unit, one end of which is connected to the third terminal, and the other end of which is connected to the power supply terminal.

[0015] In some embodiments, the battery equalization protection circuit further includes:

[0016] The third protection unit is connected between the second protection unit and the power supply terminal.

[0017] In some embodiments, the second protection unit includes a diode, the third protection unit includes a second high-frequency interference suppressor, the positive terminal of the diode is connected to the third terminal, the negative terminal of the diode is connected to one end of the second high-frequency interference suppressor, and the other end of the second high-frequency interference suppressor is connected to the power supply terminal.

[0018] In some embodiments, the regulated voltage of the voltage regulator is less than the maximum operating voltage of the corresponding equalization switch.

[0019] In some embodiments, each equalization module includes the same number and value of resistors.

[0020] This application also provides a battery management system, including the battery equalization protection circuit in the above embodiments.

[0021] Beneficial Effects: This application provides a battery equalization protection circuit, including: a data acquisition unit, an equalization unit, and a filtering unit. The data acquisition unit has multiple equalization terminals, and any two adjacent equalization terminals are used to connect to the two ends of a corresponding equalization switch. The equalization unit includes equalization modules corresponding to each equalization terminal, and any two adjacent equalization terminals are respectively connected to the two ends of a corresponding battery through the corresponding equalization module to form an equalization loop with the corresponding battery. The filtering unit includes filtering modules corresponding to each equalization loop, and the filtering module has a first terminal and a second terminal, which are respectively connected to two equalization terminals in the corresponding equalization loop. This application uses the filtering unit connected to the equalization loop to filter and suppress the voltage between two adjacent equalization terminals of the data acquisition unit, avoiding damage to the data acquisition unit from high voltage surges.

[0022] This application provides a battery management system including the battery equalization protection circuit described in the above embodiments. Therefore, it can possess all the technical features and effects of the aforementioned battery equalization protection circuit, which will not be repeated here. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a structural block diagram of a battery equalization protection circuit according to an embodiment of this application;

[0025] Figure 2 This is a structural block diagram of a battery equalization protection circuit in an embodiment of this application;

[0026] Figure 3 This is another structural block diagram of the battery equalization protection circuit in the embodiments of this application;

[0027] Figure 4 This is another structural block diagram of the battery equalization protection circuit in the embodiments of this application;

[0028] Figure 5 This is another structural block diagram of the battery equalization protection circuit in the embodiments of this application;

[0029] Figure 6 This is a circuit diagram of a battery equalization protection circuit in an embodiment of this application;

[0030] Figure 7 This is a circuit structure diagram of a battery equalization protection circuit in an embodiment of this application that includes multiple filtering modules.

[0031] Explanation of reference numerals in the attached diagram: 10-Acquisition unit, 11-Equalization terminal, 12-Power supply terminal, 13-Equalization switch, 20-Equalization unit, 21-Equalization module, 30-Filtering unit, 31-Filtering module, 311-First terminal, 312-Second terminal, 313-Filtering device, 314-Voltage regulator, 40-First protection unit, 41-First high-frequency interference suppressor, 50-Second protection unit, 60-Third protection unit, 61-Second high-frequency interference suppressor, 70-Battery pack, 71-Third terminal, 72-Battery. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] In the description of this application, it should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the application. Terms such as "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0034] This application provides a battery balancing protection circuit and a battery management system, which are described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0035] As a preamble to the embodiments of this application, in new energy vehicles, when there is an insulation abnormality between the high-voltage line and ground, such as water ingress into the high-voltage connector or damage to the wiring harness insulation layer, when high-voltage electricity is input to the battery pack from the outside, such as when charging with a fast charging pile or a slow charging pile, high voltage will be applied to the positive and negative terminals of the battery. This high voltage will then be applied to the analog front-end chip (AFE chip) of the battery management system slave control board. In addition, oscilloscope testing shows that the single-cell equalization channel of the AFE chip will generate a reverse voltage interference fluctuation of approximately -22V, which far exceeds the chip's voltage withstand capability, causing chip damage. The acquisition unit in the battery management system is the AFE chip of the battery management system slave control board, which has the functions of acquiring battery voltage and providing a battery equalization channel.

[0036] In view of this, embodiments of this application provide a battery equalization protection circuit and a battery management system, which solves the technical problem that, during battery charging, when an insulation abnormality occurs between the charging device and ground, high voltage can affect the acquisition unit connected to the battery, causing damage to the acquisition unit. This application uses a filtering unit connected to the equalization circuit to filter and suppress the voltage between two adjacent equalization terminals of the acquisition unit, thus preventing high voltage from damaging the acquisition unit.

[0037] Please see Figure 1 , Figure 1 This is a structural block diagram of a battery equalization protection circuit according to an embodiment of this application. This application provides a battery equalization protection circuit, including: a data acquisition unit 10, which has multiple equalization terminals 11, with any two adjacent equalization terminals 11 connected to the two ends of a corresponding equalization switch 13; an equalization unit 20, which includes equalization modules 21 corresponding to each equalization terminal 11, with any two adjacent equalization terminals 11 connected to the two ends of a corresponding battery 72 through the corresponding equalization modules 21 to form an equalization loop with the corresponding battery 72; and a filtering unit 30, which includes filtering modules 31 corresponding to each equalization loop, with each filtering module 31 having a first end 311 and a second end 312, the first end 311 and the second end 312 respectively connected to two equalization terminals 11 in the corresponding equalization loop.

[0038] It should be noted that the acquisition unit 10 can provide a battery 72 equalization channel, etc.; the equalization switch 13 can be a field-effect transistor or other device that can be used as a switch to enable the battery 72 to perform the equalization process. When the acquisition unit 10 detects that there is a voltage difference between the voltages of the batteries 72 that meets the conditions for voltage equalization, it opens the corresponding equalization switch 13 to make the equalization circuit corresponding to that battery 72 conduct, thereby executing the equalization process; the equalization module 21 is used to consume a part of the electrical energy during the equalization process based on the conduction of the equalization circuit of the battery 72, converting the excess charge into heat energy, thereby achieving the equalization effect; the filtering module 31 is used to filter and suppress the voltage between two adjacent equalization terminals 11 of the acquisition unit 10, avoiding the impact damage of high voltage to the acquisition unit 10.

[0039] The filtering module 31 has a first terminal 311 and a second terminal 312, which are respectively connected to two equalization terminals 11 in the corresponding equalization loop. Specifically, the equalization module 21 is connected to the corresponding equalization terminal 11 via the first terminal 311, and / or the equalization module 21 is connected to the corresponding equalization terminal 11 via the second terminal 312. That is, in some embodiments, the equalization module 21 in the equalization unit 20 is connected to the corresponding equalization terminal 11 via the first terminal 311; in some embodiments, the equalization module 21 is connected to the corresponding equalization terminal 11 via the second terminal 312; and in some embodiments, the equalization module 21 is connected to the corresponding equalization terminal 11 via both the first terminal 311 and the second terminal 312. It should be noted that in this application, any two adjacent equalization terminals 11 are connected to the two ends of the corresponding battery 72 through corresponding equalization modules 21 to form an equalization circuit with the corresponding battery 72. Therefore, the equalization circuits corresponding to two adjacent batteries 72 share a common equalization terminal 11. This common equalization terminal 11 is simultaneously connected to the second end 312 of the filter module 31 in the equalization circuit corresponding to one of the two adjacent batteries 72 and the first end 311 of the filter module 31 in the equalization circuit corresponding to the other battery 72. For the equalization modules 21 on the common equalization terminal 11, they are connected to the corresponding equalization terminal 11 via the first end 311 and the second end 312. For the equalization modules 21 on non-shared equalization terminals 11, the equalization module 21 connected to the positive terminal of the battery 72 is connected to the corresponding equalization terminal 11 via the first end 311, and the equalization module 21 connected to the negative terminal of the battery 72 is connected to the corresponding equalization terminal 11 via the second end 312. For an example, please refer to [link to example]. Figure 6 As shown, the acquisition unit 10 includes equalization terminals 11 from CB1 to CBn+1, where n represents the total number of batteries. Thus, n batteries have n+1 equalization terminals 11. Field-effect transistors Q1 to Qn are equalization switches 13. Batteries B1 to Bn are connected in series to form a battery string. The equalization terminals 11 corresponding to battery B1 are CB1 and CB2, and the equalization terminals 11 corresponding to battery B2 are CB2 and CB3. The equalization terminal 11 shared by batteries B1 and B2 is CB2. The equalization module 21 on equalization terminal 11 is connected to equalization terminal CB2 via the first terminal 311 and the second terminal 312 of the filter module 31 corresponding to battery B2. The equalization module 21 on equalization terminal 11 is connected to equalization terminal CB1 via the first terminal 311 of the filter module 31 corresponding to battery B1. The equalization module 21 on equalization terminal 11 is connected to the corresponding equalization terminal CB3 via the second terminal 312 of the filter module 31 corresponding to battery B2.

[0040] Through the above technical solution, this application connects the filter unit 30 to the equalization circuit, thereby filtering and suppressing the voltage between two adjacent equalization terminals 11 of the acquisition unit 10, preventing high voltage from damaging the acquisition unit 10, and thus protecting the normal operation of the acquisition unit 10. In addition, the positive electrode equalization module 21 of the battery 72 is connected to the corresponding equalization terminal 11 after passing through the first terminal 311 of the filter unit 30. By dividing the voltage through the equalization module 21, the voltage can be reduced, minimizing damage to subsequent circuit components from high voltage, and improving the reliability and stability of the entire circuit.

[0041] Please see Figure 2 , Figure 2 This is a structural block diagram of a battery equalization protection circuit in an embodiment of this application. In some embodiments, the filtering module 31 includes a filtering component 313 and a voltage regulator 314 connected in parallel. One end of the filtering component 313 is connected to a first terminal 311 via a first terminal 314, and the other end of the filtering component 313 is connected to a second terminal 312 via a second terminal 314. One end of the filtering component 313 is connected to a corresponding equalization terminal 11 via a first terminal 314, and the other end of the filtering component 313 is connected to a corresponding equalization terminal 11 via a second terminal 314.

[0042] In some embodiments, the filter device 313 can be a capacitor, and the voltage regulator device 314 can be one of a TVS diode, a Zener diode, etc.; for an example, please refer to [link to example]. Figure 6 As shown, the filter device 313 can be a capacitor C1, and the voltage regulator device 314 can be a Zener diode D1. One end of the capacitor C1 is connected to the cathode of the Zener diode D1 at the first terminal 311, and the other end of the capacitor C1 is connected to the anode of the Zener diode D1 at the second terminal 312. It should be noted that this is an exemplary embodiment. Figure 6 In the middle section, capacitors C1 to C6 are all filter devices 313, and Zener diodes D1 to D6 are all voltage regulator devices 314. In addition, the number of filter devices 313 and voltage regulator devices 314 in this solution may be more or less than the number shown in the attached figure, depending on the actual situation.

[0043] It should be noted that the filter device 313 is used for transient interference filtering, and the voltage regulator device 314 is used to provide a stable voltage output in the circuit. Thus, when the input voltage in the equalization circuit exceeds the voltage of the Zener diode, the Zener diode conducts, thereby limiting the voltage at the equalization terminal 11 and protecting the equalization switch 13 from damage by high voltage. Furthermore, in some embodiments, the regulated voltage of the voltage regulator device 314 is less than the maximum operating voltage of the corresponding equalization switch 13. In some embodiments, the equalization switch 13 uses a field-effect transistor, and the regulated voltage of the Zener diode is less than the maximum operating voltage of the field-effect transistor, thereby achieving overvoltage protection for the equalization switch 13. In addition, the capacitor connected in parallel with the Zener diode suppresses and filters short-term impacts. These capacitors can absorb and smooth short-term impacts, protecting the components in the circuit from the impact. Thus, the filter module 31 achieves transient interference filtering and voltage regulation through the filter device 313 and the voltage regulator device 314 to protect the equalization switch 13 for normal operation, improve the stability and reliability of the circuit, and reduce the risk of damage to the equalization switch 13.

[0044] Please see Figure 3 , Figure 3 This is another structural block diagram of the battery equalization protection circuit in this application embodiment. In some embodiments, the battery equalization protection circuit further includes: a first protection unit 40, the first protection unit 40 including a plurality of first high-frequency suppression interference devices 41 corresponding one-to-one with the equalization circuit, the first high-frequency suppression interference devices 41 being connected between the positive terminal of the battery 72 and the corresponding equalization module 21.

[0045] It should be noted that the first high-frequency noise suppressor 41 is used for high-frequency noise suppression and filtering in the circuit. The first high-frequency noise suppressor 41 can be a ferrite bead. A ferrite bead can suppress and filter high-frequency noise in the circuit. It can provide high impedance to absorb and attenuate high-frequency noise, thereby reducing the impact of noise on the circuit. For an example, please refer to [link to example]. Figure 6 As shown, Figure 6 The medium magnetic beads F1 to F6 are all first high-frequency suppression interference devices 41. The number of first high-frequency suppression interference devices 41 in this scheme can be more or less than that shown in the attached figure, depending on the actual situation.

[0046] Please see Figure 4 , Figure 4This is another structural block diagram of the battery equalization protection circuit in the embodiments of this application. In some embodiments, the batteries 72 in each equalization circuit are connected in series to form a battery pack 70. The battery pack 70 has a third terminal 71, which is connected to the positive terminal of the first battery 72 in the battery pack 70 and is used to input the charging voltage of the battery pack 70. The acquisition unit 10 also has a power supply terminal 12, which is used to input the power supply voltage of the acquisition unit 10. The battery equalization protection circuit further includes a second protection unit 50, one end of which is connected to the third terminal 71, and the other end of which is connected to the power supply terminal 12.

[0047] In some embodiments, the second protection unit 50 includes a diode. It should be noted that the acquisition unit 10 can only operate normally after its power supply terminal 12 receives the power supply voltage. In some embodiments, the equalization channel corresponding to a single battery 72 of the acquisition unit 10 generates a reverse voltage interference fluctuation of approximately -22V, far exceeding the chip's withstand voltage capability, which can easily lead to chip damage. Therefore, through the second protection unit 50, when a negative voltage is input to the equalization channel, the diode conducts forward, making the negative voltage at each equalization terminal 11 the same as the voltage drop when the diode conducts forward. Generally, the voltage drop when the diode conducts forward is less than 0.7V, ensuring that the equalization switch 13 operates within a safe operating voltage range to prevent device damage. This avoids damage to the chip from reverse voltage interference fluctuations, thus effectively protecting the chip from high reverse voltage interference and ensuring its normal operation and reliability. For an example, please refer to [link to example]. Figure 6 , Figure 6 Diode D7 is the second protection unit 50.

[0048] Please see Figure 5 , Figure 5 This is another structural block diagram of the battery equalization protection circuit in the embodiments of this application. In some embodiments, the battery equalization protection circuit further includes a third protection unit 60, which is connected between the second protection unit 50 and the power supply terminal 12.

[0049] In some embodiments, the third protection unit 60 includes a second high-frequency interference suppressor 61, the positive terminal of a diode is connected to the third terminal 71, the negative terminal of the diode is connected to one end of the second high-frequency interference suppressor 61, and the other end of the second high-frequency interference suppressor 61 is connected to the power supply terminal 12.

[0050] It should be noted that the second high-frequency noise suppressor 61 is used for high-frequency noise suppression and filtering in the circuit. The second high-frequency noise suppressor 61 can be a ferrite bead. After the second protection unit 50 avoids damage to the chip by reverse voltage interference fluctuations, the second high-frequency noise suppressor 61 suppresses and filters high-frequency noise in the circuit.

[0051] Please see Figure 6and Figure 7 As shown, Figure 6 This is a circuit diagram of a battery equalization protection circuit in an embodiment of this application. Figure 7 This is a circuit structure diagram of a battery equalization protection circuit in an embodiment of this application that includes multiple filter modules 31. In some embodiments, the equalization module 21 includes at least one resistor connected in series, and when there are multiple filter modules 31, the two ends of each filter module 313 are respectively connected to the corresponding resistor.

[0052] It should be noted that the resistor plays a role in energy dissipation in the battery 72 balancing circuit. When there is a voltage difference between the batteries 72, the resistor will consume the excess electrical energy of the corresponding battery 72 and convert it into heat energy. This can prevent the voltage difference between the batteries 72 from increasing further and maintain the stability of the battery 72 series. In addition, in this application, the balancing module 21 includes at least one resistor in series. The purpose of using multiple resistors is to increase the balancing effect and improve the stability of the system. Furthermore, in order to reduce the size of the filter module 31 and improve the reliability and stability of the system, there can be multiple filter modules 31. The two ends of each filter element 313 are connected to the corresponding resistor, so that the resistor and the filter element 313 form an RC filter for filtering transient interference. For an example, please refer to [link to example]. Figure 7 As shown, capacitor C21 and Zener diode D9 constitute filter module 31, and capacitor C1 and Zener diode D1 also constitute filter module 31. Both filter modules 31 are within the same equalization circuit. Furthermore, the two ends of capacitor C21 are connected to resistors R2 and R5 respectively, and the two ends of capacitor C1 are connected to resistors R3 and R6 respectively. It should also be noted that there can be only one filter module 31, such as... Figure 6 As shown, Figure 6 In the middle section, capacitors C1 to C6 are all filter devices 313, and Zener diodes D1 to D6 are all voltage regulator devices 314. In addition, the number of filter devices 313 and voltage regulator devices 314 in this solution may be more or less than the number shown in the attached figure, depending on the actual situation.

[0053] Furthermore, in some embodiments, each equalization module 21 includes the same number and value of resistors.

[0054] It should be noted that, in order to ensure the balancing effect of the batteries 72, the number of batteries 72 connected to the balancing resistors at the positive and negative terminals of the batteries 72 and the resistance value of the resistors should be the same. That is, the two balancing modules 21 corresponding to the positive and negative terminals of the batteries 72 should be symmetrical. In addition, the resistors included in the balancing module 21 in this application are both balancing resistors and overvoltage and negative voltage current limiting resistors, and the equal resistance values ​​in the packages can balance heat.

[0055] Furthermore, it should be noted that the acquisition unit 10 also has the function of acquiring the voltage of battery 72. Please refer to [link / reference]. Figure 6 As shown, ports CT1 to CTn in the acquisition unit 10 are all acquisition ports used to acquire the voltage of the corresponding battery 72. Based on the acquired battery 72 voltage, the opening and closing of each equalization switch 13 is controlled to achieve the equalization process of the battery 72. In this application, each acquisition port corresponds one-to-one with a battery 72, and each acquisition port is connected to the positive terminal of the corresponding battery 72. Furthermore, to protect each acquisition port, a filtering circuit is provided between each acquisition port and the positive terminal of the corresponding battery 72. In this application, each acquisition port adopts a dual RC filter structure. Using two RC filter structures consecutively can provide a deeper filtering effect. The first RC filter structure can filter out some high-frequency noise and interference, while the second RC filter structure can further filter out the remaining high-frequency components. This achieves a stronger high-frequency filtering effect and improves the overall circuit's ability to suppress high-frequency noise. In addition, using two RC filter structures consecutively can expand the frequency range of the filter. The first RC filter structure can filter out higher-frequency signals, while the second RC filter structure can filter out lower-frequency signals. By combining the outputs of the two filter structures, filtering of a wider frequency range can be achieved, adapting to the processing needs of different frequency signals. For example, please refer to Figure 6 As shown, capacitor C9 and resistor R2 form the first RC filter structure, capacitor C10 and resistor R27 form the second RC filter structure, and so on. Capacitors C9 to C20 and resistors R26 to R38 are all filter structures of acquisition unit 10. The number of filter structures in acquisition unit 10 in this scheme can be more or less than the number shown in the attached figure, depending on the actual situation. In addition, between the power supply terminal 12 and the third protection unit 60, there is also a π filter structure composed of capacitor C7, capacitor C8, and resistor R25, which is grounded through Zener diode D8 to provide overvoltage protection. By adjusting the values ​​of capacitors and resistors, signals of different frequency ranges can be filtered and processed to protect power supply terminal 12. In addition, the third terminal 71 of battery pack 70 can also be connected to the negative terminal of the last battery in other battery packs 70. Multiple battery packs 70 are connected in series to form a battery pack. Each battery pack 70 corresponds to an acquisition unit 10 and has a corresponding battery equalization protection circuit. Multiple acquisition units 70 provide battery voltage acquisition, battery equalization channels, etc. to their corresponding battery packs 70.

[0056] In some embodiments, the battery equalization protection circuit provided in this application can be applied to, but is not limited to, new energy vehicles, and can also be applied to various products that require the use of rechargeable batteries to improve the safety, lifespan and performance of the products.

[0057] Accordingly, this application also provides a battery management system, including the battery equalization protection circuit described in the above embodiments. Therefore, it can possess all the technical features and effects of the aforementioned battery equalization protection circuit, and will not be repeated here.

[0058] The above provides a detailed description of a battery equalization protection circuit and battery management system provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery equalization protection circuit, characterized in that, include: The acquisition unit has multiple equalization terminals, and any two adjacent equalization terminals are used to connect to the two ends of a corresponding equalization switch. The equalization unit includes equalization modules that correspond one-to-one with each of the equalization terminals. Any two adjacent equalization terminals are connected to the two ends of the corresponding battery through the corresponding equalization modules to form an equalization loop with the corresponding battery. The filtering unit includes filtering modules that correspond one-to-one with each of the equalization loops. Each filtering module has a first terminal and a second terminal, which are respectively connected to two equalization terminals in the corresponding equalization loop.

2. The battery equalization protection circuit according to claim 1, characterized in that, The filtering module includes a filtering device and a voltage regulator connected in parallel. One end of the filtering device is connected to one end of the voltage regulator and is connected to the first terminal. The other end of the filtering device is connected to the other end of the voltage regulator and is connected to the second terminal. One end of the filtering device is connected to the corresponding equalization terminal via one end of the voltage regulator and the other end of the filtering device is connected to the corresponding equalization terminal via the other end of the voltage regulator.

3. The battery equalization protection circuit according to claim 2, characterized in that, The equalization module includes at least one resistor connected in series. When there are multiple filtering modules, the two ends of each filtering module are connected to the corresponding resistor.

4. The battery equalization protection circuit according to claim 1, characterized in that, Also includes: The first protection unit includes a plurality of first high-frequency suppression interference devices corresponding one-to-one with the equalization circuit. The first high-frequency suppression interference devices are connected between the positive terminal of the battery and the corresponding equalization module.

5. The battery equalization protection circuit according to claim 1, characterized in that, The batteries in each equalization circuit are connected in series to form a battery pack. The battery pack has a third terminal, which is connected to the positive terminal of the first battery in the battery pack for inputting the charging voltage of the battery pack. The acquisition unit also has a power supply terminal, which is used to input the power supply voltage of the acquisition unit; The battery equalization protection circuit further includes a second protection unit, one end of which is connected to the third terminal, and the other end of which is connected to the power supply terminal.

6. The battery equalization protection circuit according to claim 5, characterized in that, Also includes: The third protection unit is connected between the second protection unit and the power supply terminal.

7. The battery equalization protection circuit according to claim 6, characterized in that, The second protection unit includes a diode, and the third protection unit includes a second high-frequency interference suppressor. The positive terminal of the diode is connected to the third terminal, the negative terminal of the diode is connected to one end of the second high-frequency interference suppressor, and the other end of the second high-frequency interference suppressor is connected to the power supply terminal.

8. The battery equalization protection circuit according to claim 3, characterized in that, The voltage regulation voltage of the voltage regulator is less than the maximum operating voltage of the corresponding equalization switch.

9. The battery equalization protection circuit according to claim 3, characterized in that, Each of the equalization modules includes the same number and value of resistors.

10. A battery management system, characterized in that, Includes the battery equalization protection circuit as described in any one of claims 1 to 9.

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