Battery pack heating film control monitoring circuit

Abstract

The utility model provides a battery pack heating film control monitoring circuit. The battery pack heating film control monitoring circuit comprises a push-pull sub-circuit, a relay and a Hall current sensor, the input end of the push-pull sub-circuit receives a heating film control signal, the other end is connected with one end of a relay coil corresponding to the relay, and the other end of the relay coil is connected with a first power supply end; one end of a relay switch corresponding to the relay is connected with a heating film power supply input end, and the other end is connected with a heating film circuit through a connecting terminal; one end of the Hall current sensor is connected with the heating film circuit through the connecting terminal so as to collect heating film current corresponding to the heating film circuit, and the other end of the Hall current sensor is connected to the microcontroller so as to output the heating film current to the microcontroller in a voltage mode. The push-pull driving circuit is introduced to enhance the control capability, the relay is combined to isolate output, and the Hall current sensor is utilized to realize lossless sampling, so that the safe operation capability and the system reliability of the battery pack in a low-temperature environment can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a battery pack heating film control and monitoring circuit. Background Technology

[0002] With the rapid development of new energy vehicles and energy storage systems, the performance degradation of lithium batteries in low-temperature environments has become increasingly prominent. Especially in cold regions, excessively low battery pack temperatures can significantly reduce discharge capacity and energy output efficiency, and may even trigger lithium dendrite growth, posing safety hazards. Therefore, more and more battery systems are incorporating heating devices such as heating films to preheat and maintain the temperature of the battery pack under low-temperature conditions, ensuring its normal operation.

[0003] Most existing battery pack heating systems use relays or MOS switches to control the on / off state of the heating film, along with temperature sensors to adjust the heating timing. However, these heating control circuits often lack real-time monitoring of the actual operating status of the heating circuit, making it impossible to accurately determine whether the heating film is working properly or whether there are abnormalities such as open circuits, short circuits, or overcurrents in the circuit. In addition, some control schemes use single-pole switches, which have limited driving capability and cannot effectively isolate interference signals, potentially leading to control failure or system malfunction. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery pack heating film control and monitoring circuit, which enhances the control capability by introducing a push-pull drive circuit, combines relay isolation output, and uses a Hall current sensor to achieve non-destructive sampling, thereby effectively improving the safe operation capability of the battery pack and the system reliability in low temperature environments.

[0005] In a first aspect, embodiments of this application provide a battery pack heating film control and monitoring circuit, including a push-pull circuit, a relay, and a Hall current sensor;

[0006] The input terminal of the push-pull circuit receives the heating film control signal, and the other end is connected to one end of the relay coil corresponding to the relay. The other end of the relay coil is connected to the first power supply terminal.

[0007] One end of the relay switch corresponding to the relay is connected to the power input terminal of the heating film, and the other end is connected to the heating film circuit through a connection terminal.

[0008] One end of the Hall current sensor is connected to the heating film circuit via the connection terminal to collect the heating film current corresponding to the heating film circuit, and the other end is connected to the microcontroller to output the heating film current to the microcontroller in the form of voltage.

[0009] In conjunction with the first aspect, the embodiments of this application provide a first possible implementation of the first aspect, wherein the push-pull circuit includes a first transistor and a second transistor;

[0010] The bases of both the first transistor and the second transistor are connected to the heating film control signal;

[0011] The collector of the first transistor is connected to the second power supply terminal, the emitter is connected to the emitter of the second transistor, and the collector of the second transistor is grounded.

[0012] The connection node between the emitters of the first transistor and the second transistor is connected to one end of the relay coil.

[0013] In conjunction with the first aspect, this application provides a second possible implementation of the first aspect, wherein the push-pull circuit further includes a first resistor and a second resistor;

[0014] One end of the first resistor is connected to the base of the first transistor;

[0015] The other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is connected to the heating film control signal.

[0016] In conjunction with the first aspect, this application provides a third possible implementation of the first aspect, wherein the push-pull circuit further includes a third resistor;

[0017] One end of the third resistor is connected to the base of the second transistor;

[0018] The other end of the third resistor is connected to the connection node between the first resistor and the second resistor.

[0019] In conjunction with the first aspect, this application provides a fourth possible implementation of the first aspect, wherein the first transistor is an NPN transistor;

[0020] The second transistor is a PNP type transistor.

[0021] In conjunction with the first aspect, this application provides a fifth possible implementation of the first aspect, which further includes a freewheeling diode for suppressing the instantaneous reverse voltage when the relay is disconnected;

[0022] The freewheeling diode is connected in parallel with the relay coil.

[0023] In conjunction with the first aspect, this application provides a sixth possible implementation of the first aspect, wherein the push-pull circuit further includes a fourth resistor for ensuring that the second transistor is rapidly pulled low in a non-conducting state;

[0024] One end of the fourth resistor is connected to the collector of the second transistor;

[0025] The other end of the fourth resistor is grounded.

[0026] In conjunction with the first aspect, this application provides a seventh possible implementation of the first aspect, which further includes a fifth resistor;

[0027] One end of the fifth resistor is connected to the output terminal of the Hall current sensor;

[0028] The other end of the fifth resistor is connected to the microcontroller.

[0029] In conjunction with the first aspect, this application provides an eighth possible implementation of the first aspect, which further includes a capacitor;

[0030] One end of the capacitor is connected between the fifth resistor and the microcontroller;

[0031] The other end of the capacitor is grounded.

[0032] Secondly, embodiments of this application provide a battery pack, including a battery pack heating film control and monitoring circuit as described in any of the first aspects.

[0033] This application provides a battery pack heating film control and monitoring circuit, including a push-pull circuit, a relay, and a Hall current sensor. The input terminal of the push-pull circuit receives the heating film control signal, and the other terminal is connected to one end of the relay coil corresponding to the relay. The other end of the relay coil is connected to a first power supply terminal. One end of the relay switch corresponding to the relay is connected to the heating film power input terminal, and the other end is connected to the heating film circuit via a connection terminal. One end of the Hall current sensor is connected to the heating film circuit via the connection terminal to collect the heating film current corresponding to the heating film circuit, and the other end is connected to a microcontroller to output the heating film current to the microcontroller in voltage form. By introducing a push-pull drive circuit to enhance control capability, combining it with relay isolation output, and utilizing a Hall current sensor for non-destructive sampling, the safe operation capability and system reliability of the battery pack in low-temperature environments can be effectively improved. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1One of the structural schematic diagrams of a battery pack heating film control and monitoring circuit provided in this embodiment of the present invention;

[0036] Figure 2 A second schematic diagram of the structure of a battery pack heating film control and monitoring circuit provided for an embodiment of this utility model;

[0037] Figure 3 A third schematic diagram of the structure of a battery pack heating film control and monitoring circuit provided for an embodiment of this utility model;

[0038] Figure 4 The fourth schematic diagram of a battery pack heating film control and monitoring circuit provided for an embodiment of this utility model.

[0039] Icons: 11-Push-pull circuit; 12-Relay; 13-Hall current sensor; 111-First transistor; 112-Second transistor; 113-First resistor; 114-Second resistor; 115-Third resistor; 116-Fourth resistor; 14-Freewheeling diode; 15-Fifth resistor; 16-Capacitor. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0045] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0046] Most existing battery pack heating systems use relays or MOS switches to control the on / off state of the heating film, along with temperature sensors to adjust the heating timing. However, these heating control circuits often lack real-time monitoring of the actual operating status of the heating circuit, making it impossible to accurately determine whether the heating film is working properly or whether there are abnormalities such as open circuits, short circuits, or overcurrents in the circuit. Furthermore, some control schemes use single-pole switches, which have limited driving capability and cannot effectively isolate interference signals, potentially leading to control failure or system malfunction.

[0047] Please see Figure 1 , Figure 1 This is one of the structural schematic diagrams of a battery pack heating film control and monitoring circuit provided in this embodiment.

[0048] like Figure 1 As shown in the figure, the battery pack heating film control and monitoring circuit provided in this embodiment includes: a push-pull circuit 11, a relay 12, and a Hall current sensor 13.

[0049] Specifically, the input terminal of the push-pull circuit 11 receives the heating film control signal V1, and the other end is connected to one end of the relay coil corresponding to the relay 12. The other end of the relay coil is connected to the first power supply terminal VCC1. One end of the relay switch corresponding to the relay 12 is connected to the heating film power input terminal VIN, and the other end is connected to the heating film circuit through the connection terminal J1. One end of the Hall current sensor 13 is connected to the heating film circuit through the connection terminal J1 to collect the heating film current corresponding to the heating film circuit, and the other end is connected to the microcontroller to output the heating film current to the microcontroller in the form of voltage.

[0050] Here, the input terminal of the push-pull circuit 11 receives the heating film control signal V1, which is used to control the opening or closing of the heating film. The output terminal of the push-pull circuit 11 is connected to one end of the relay coil corresponding to the relay 12, which is used to drive the relay coil to conduct. The other end of the relay coil is connected to the first power supply terminal VCC1 to provide the coil driving voltage. One end of the relay switch corresponding to the relay 12 is connected to the power input terminal VIN of the heating film, and the other end is connected to the heating film circuit through the connection terminal J1, so that VIN can supply power to the heating film when the relay is closed.

[0051] To enable real-time monitoring of the heating film's operating status, one end of the Hall current sensor 13 is connected in series with the heating film circuit via terminal J1 to collect current information from the circuit in real time. Its output is connected to a microcontroller (MCU) (not shown in the figure), and the collected heating film operating current is output as a voltage (Vout) to the MCU's ADC sampling interface. Based on this voltage signal, the MCU can determine the current operating status of the heating film, including whether it is powered on and whether the current is within the normal range, thereby enabling fault diagnosis and safety protection control of the heating film.

[0052] Optionally, the Hall current sensor 13 can be an Avago ACS712-5.

[0053] In practice, when the heating film needs to be turned on, the MCU signal controls the heating film control signal V1 to close the relay 12, so that the heating film power input terminal VIN signal and the heating film at the connection terminal J1 form a conduction mode, and the heating film turns on to heat. At this time, the magnitude of the current on the heating film can be determined by the Hall current sensor 13.

[0054] Here, when relay 12 is not turned on, the heating film is not turned on, and the Hall current sensor 13 has no output and no current. When relay 12 is turned on, the heating film turns on, the Hall current sensor 13 collects the current and outputs Vout to the MCU in the form of voltage.

[0055] For example, in an energy storage product, the heating film is heated using the battery pack voltage. For a 48V system, the VIN signal at the heating film power input terminal is 48V. Assuming the resistance of the heating film is 100Ω, the current Ip = 48V / 100Ω = 0.48A. Therefore, the output Vout of the Hall current sensor 13 = VDD / 2 + K*Ip, where K is the sensitivity coefficient of the Hall current sensor 13. Taking Avago ACS712-5 as an example, K = 0.185. Assuming the supply voltage of the Hall current sensor 13 is 5V, then Vout = 2.5888V. This value is sent to the ADC pin of the MCU and determined by the MCU's ADC.

[0056] Furthermore, since the resistance of the heating film is constant, the current collected by the Hall current sensor 13 is constant (Vout output is constant). When the current collection is abnormal, the data collected by the MCU from Vout deviates from the actual data, which can determine that the heating film is abnormal. At this time, the relay 12 will be disconnected and a heating film fault alarm will be reported.

[0057] Here, the most important aspect of the energy storage system is battery protection, and the heating film is installed close to the battery pack. The resistance and power of the heating film used are confirmed during the design of the energy storage product. Therefore, the value collected by the Hall current sensor 13 when the heating film is turned on is a confirmed value (considering actual deviations, the final value collected by the MCU will be within a small range, such as ±1%, which is considered reasonable in practice and theoretically, indicating that the heating film is in normal working condition).

[0058] Here, we assume that the theoretical voltage obtained by the Hall current sensor 13 under the set resistance and power of the heating film is denoted as Vnormal, and the actual voltage collected is denoted as V0. Then: when the heating film is not turned on, relay 12 is turned on, V0 = 0V, and the heating film is malfunctioning; when the heating film is normally turned on, relay 12 is turned on, and the voltage V0 collected by the MCU's ADC is much greater than Vnormal or much less than Vnormal, and the heating film is malfunctioning; when the heating film is not turned off, relay 12 is turned off, and the voltage V0 collected by the MCU's ADC is at a certain value (greater than 0V) or directly Vnormal, and the heating film is malfunctioning.

[0059] This application provides a battery pack heating film control and monitoring circuit, including a push-pull circuit, a relay, and a Hall current sensor. The input terminal of the push-pull circuit receives the heating film control signal, and the other terminal is connected to one end of the relay coil corresponding to the relay. The other end of the relay coil is connected to a first power supply terminal. One end of the relay switch corresponding to the relay is connected to the heating film power input terminal, and the other end is connected to the heating film circuit via a connection terminal. One end of the Hall current sensor is connected to the heating film circuit via the connection terminal to collect the heating film current corresponding to the heating film circuit, and the other end is connected to a microcontroller to output the heating film current to the microcontroller in voltage form. By introducing a push-pull drive circuit to enhance control capability, combining it with relay isolation output, and utilizing a Hall current sensor for non-destructive sampling, the safe operation capability and system reliability of the battery pack in low-temperature environments can be effectively improved.

[0060] Please see Figure 2 , Figure 2 This is the second schematic diagram of a battery pack heating film control and monitoring circuit provided in this embodiment.

[0061] like Figure 2 As shown, another battery pack heating film control and monitoring circuit provided in this embodiment includes: a push-pull circuit 11, a relay 12, and a Hall current sensor 13. The push-pull circuit includes a first transistor 111 and a second transistor 112, and also includes a first resistor 113, a second resistor 114, a third resistor 115, and a fourth resistor 116.

[0062] Specifically, the bases of both the first transistor 111 and the second transistor 112 are connected to the heating film control signal V1; the collector of the first transistor 111 is connected to the second power supply terminal VCC2, and its emitter is connected to the emitter of the second transistor 112, while the collector of the second transistor 112 is grounded; the connection node between the emitters of the first transistor 111 and the second transistor 112 is connected to one end of the relay coil. One end of the first resistor 113 is connected to the base of the first transistor 111; the other end of the first resistor 113 is connected to one end of the second resistor 114, and the other end of the second resistor 114 is connected to the heating film control signal V1. One end of the third resistor 115 is connected to the base of the second transistor 112; the other end of the third resistor 115 is connected to the connection node between the first resistor 113 and the second resistor 114. One end of the fourth resistor 116 is connected to the collector of the second transistor 112; the other end of the fourth resistor 116 is grounded.

[0063] Here, the bases of both the first transistor 111 and the second transistor 112 are connected to the heating film control signal V1 to receive external control commands; the first transistor 111 is an NPN transistor, its collector is connected to the second power supply terminal VCC2, and its emitter is connected to the emitter of the second transistor 112; the second transistor 112 is a PNP transistor, and its collector is grounded.

[0064] The common connection node between the emitters of the first transistor 111 and the second transistor 112 serves as the output terminal of the push-pull circuit 11, and is connected to one end of the relay coil of the relay 12 to drive the relay to conduct. The other end of the relay coil is connected to the first power supply terminal VCC1.

[0065] In practical implementation, a bias resistor network is set up to ensure the stable operation of the push-pull circuit. The first resistor 113 is connected at one end to the base of the first transistor 111 and at the other end to one end of the second resistor 114. The other end of the second resistor 114 is connected to the heating film control signal V1 to control the base voltage through voltage division. The third resistor 115 is used to adjust the base potential of the second transistor 112; one end is connected to the base of the second transistor 112, and the other end is connected to the connection node between the first resistor 113 and the second resistor 114. The fourth resistor 116 is connected at one end to the collector of the second transistor 112 and at the other end to ground, ensuring that the second transistor 112 is quickly pulled low in the non-conducting state, improving circuit stability and preventing parasitic oscillations.

[0066] Thus, the push-pull structure described above has bidirectional driving capability. Under the action of the control signal V1, it can reliably pull up or pull down the potential of the common emitter node, thereby ensuring the reliable operation of the relay 12 and adapting to different power supply configurations.

[0067] For further details, please refer to Figure 3 , Figure 3 This is the third schematic diagram of a battery pack heating film control and monitoring circuit provided for an embodiment of this utility model.

[0068] like Figure 3 As shown, another battery pack heating film control and monitoring circuit provided in this embodiment includes: a push-pull circuit 11, a relay 12, and a Hall current sensor 13. The push-pull circuit includes a first transistor 111 and a second transistor 112, a first resistor 113, a second resistor 114, a third resistor 115, and a fourth resistor 116. It also includes a freewheeling diode 14 for suppressing the instantaneous reverse voltage when the relay 12 is disconnected.

[0069] Specifically, the freewheeling diode 14 is connected in parallel with the relay coil corresponding to the relay 12.

[0070] For further details, please refer to Figure 4, Figure 4 The fourth schematic diagram of a battery pack heating film control and monitoring circuit provided for an embodiment of this utility model.

[0071] like Figure 4 As shown, another battery pack heating film control and monitoring circuit provided in this embodiment includes: a push-pull circuit 11, a relay 12, and a Hall current sensor 13. The push-pull circuit includes a first transistor 111 and a second transistor 112, a first resistor 113, a second resistor 114, a third resistor 115, and a fourth resistor 116. It also includes a freewheeling diode 14, a fifth resistor 15, and a capacitor 16 for suppressing the instantaneous reverse voltage when the relay 12 is disconnected.

[0072] Specifically, one end of the fifth resistor 15 is connected to the output terminal of the Hall current sensor 13; the other end of the fifth resistor 15 is connected to the microcontroller MCU (not shown in the figure). One end of the capacitor 16 is connected between the fifth resistor 15 and the microcontroller; the other end of the capacitor 16 is grounded.

[0073] As one possible implementation, this application embodiment also provides a battery pack, which includes multiple battery cells connected in series and then in parallel, a heating film tightly covering the outside of the battery pack, and other components such as... Figures 1-4 The battery pack heating film control and monitoring circuit shown in any of the diagrams.

[0074] This application provides a battery pack heating film control and monitoring circuit, including a push-pull circuit, a relay, and a Hall current sensor. The input terminal of the push-pull circuit receives the heating film control signal, and the other terminal is connected to one end of the relay coil corresponding to the relay. The other end of the relay coil is connected to a first power supply terminal. One end of the relay switch corresponding to the relay is connected to the heating film power input terminal, and the other end is connected to the heating film circuit via a connection terminal. One end of the Hall current sensor is connected to the heating film circuit via the connection terminal to collect the heating film current corresponding to the heating film circuit, and the other end is connected to a microcontroller to output the heating film current to the microcontroller in voltage form. By introducing a push-pull drive circuit to enhance control capability, combining it with relay isolation output, and utilizing a Hall current sensor for non-destructive sampling, the safe operation capability and system reliability of the battery pack in low-temperature environments can be effectively improved.

[0075] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack heating film control and monitoring circuit, characterized in that, This includes push-pull circuits, relays, and Hall effect current sensors; The input terminal of the push-pull circuit receives the heating film control signal, and the other end is connected to one end of the relay coil corresponding to the relay. The other end of the relay coil is connected to the first power supply terminal. One end of the relay switch corresponding to the relay is connected to the power input terminal of the heating film, and the other end is connected to the heating film circuit through a connection terminal. One end of the Hall current sensor is connected to the heating film circuit via the connection terminal to collect the heating film current corresponding to the heating film circuit, and the other end is connected to the microcontroller to output the heating film current to the microcontroller in the form of voltage.

2. The battery pack heating film control and monitoring circuit according to claim 1, characterized in that, The push-pull circuit includes a first transistor and a second transistor; The bases of both the first transistor and the second transistor are connected to the heating film control signal; The collector of the first transistor is connected to the second power supply terminal, the emitter is connected to the emitter of the second transistor, and the collector of the second transistor is grounded. The connection node between the emitters of the first transistor and the second transistor is connected to one end of the relay coil.

3. The battery pack heating film control and monitoring circuit according to claim 2, characterized in that, The push-pull circuit also includes a first resistor and a second resistor; One end of the first resistor is connected to the base of the first transistor; The other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is connected to the heating film control signal.

4. The battery pack heating film control and monitoring circuit according to claim 3, characterized in that, The push-pull circuit also includes a third resistor; One end of the third resistor is connected to the base of the second transistor; The other end of the third resistor is connected to the connection node between the first resistor and the second resistor.

5. The battery pack heating film control and monitoring circuit according to claim 2, characterized in that: The first transistor is an NPN transistor; The second transistor is a PNP type transistor.

6. The battery pack heating film control and monitoring circuit according to claim 1, characterized in that, It also includes a freewheeling diode for suppressing the instantaneous reverse voltage when the relay is disconnected; The freewheeling diode is connected in parallel with the relay coil.

7. The battery pack heating film control and monitoring circuit according to claim 2, characterized in that, The push-pull circuit also includes a fourth resistor to ensure that the second transistor is quickly pulled low in the non-conducting state; One end of the fourth resistor is connected to the collector of the second transistor; The other end of the fourth resistor is grounded.

8. The battery pack heating film control and monitoring circuit according to claim 1, characterized in that, It also includes a fifth resistor; One end of the fifth resistor is connected to the output terminal of the Hall current sensor; The other end of the fifth resistor is connected to the microcontroller.

9. The battery pack heating film control and monitoring circuit according to claim 8, characterized in that, It also includes capacitors; One end of the capacitor is connected between the fifth resistor and the microcontroller; The other end of the capacitor is grounded.

10. A battery pack, characterized in that, Includes the battery pack heating film control and monitoring circuit as described in any one of claims 1-9.

Images