Heating circuit and battery

Abstract

The utility model discloses a heating circuit and a battery. The heating circuit comprises at least two switch modules and a heating module. The heating module and the at least two switch modules are connected in series between the first power supply end and the second power supply end, and the heating module is used for generating heat when the switch modules are conducted; wherein the types of the switching devices included in the at least two switching modules are different. According to the utility model, the condition that the heating circuit always works mistakenly is reduced, so that the power consumption of the heating circuit is reduced, the condition that the battery temperature is too high is reduced, the working reliability of the heating circuit is improved, and the charge-discharge performance of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a heating circuit and a battery. Background Art

[0002] At present, lithium battery PACK cannot be charged or discharged because the activity of the battery cells is poor under low temperature conditions. In order to make the battery work under low temperature conditions, it is usually necessary to install a heating circuit for the battery so that the battery can work normally under low ambient temperature conditions.

[0003] The existing heating circuit usually heats the battery through a heating resistor, but the existing heating resistor is prone to malfunctioning, resulting in excessively high battery temperature, affecting the battery's charge and discharge performance, and when the heating resistor malfunctions, the power consumption of the heating circuit is large. Utility Model Content

[0004] The utility model provides a heating circuit and a battery, which are beneficial to reducing the situation where the heating circuit always malfunctions, so as to reduce the power consumption of the heating circuit and reduce the situation where the battery temperature is too high, thereby improving the reliability of the heating circuit operation and improving the charging and discharging performance of the battery.

[0005] In a first aspect, the utility model provides a heating circuit, comprising: at least two switch modules and a heating module; the heating module and at least two switch modules are connected in series between a first power supply terminal and a second power supply terminal, and the heating module is used to generate heat when all the switch modules are turned on; wherein, the types of switch devices included in at least two switch modules are different.

[0006] Optionally, at least one switch module includes a relay, and at least one switch module includes a transistor; the relay includes a coil and a contact, the first end of the coil is connected to a first control signal, and the second end of the coil is grounded; the gate of the transistor is connected to a second control signal, and the transistor, the contact and the heating module are connected in series.

[0007] Optionally, the heating circuit further includes a control module, which is connected to the control end of each switch module respectively and is used to control the conduction state of the switch module.

[0008] Optionally, at least two switch modules include a first switch module and a second switch module; the heating module is connected in series between the first switch module and the second switch module; the heating circuit also includes a first resistor module and a second resistor module; the first resistor module is connected in parallel with the first switch module; the second resistor module is connected in parallel with the second switch module; the control module is also connected to the common end, the first power supply end and the second power supply end of the first switch module and the heating module, respectively, and the control module is used to output a first control signal to the first switch module to control the conduction state of the first switch module, and output a second control signal to the second switch module to control the conduction state of the second switch module; the control module is also used to determine whether the first switch module or the second switch module has a fault based on the voltage size of the common end, the voltage between the first power supply end and the second power supply end, and whether the first control signal and the second control signal are output.

[0009] Optionally, the first switch module includes a first switch device and a first drive circuit, and the second switch module includes a second switch device and a second drive circuit; the control electrode of the first switch device serves as the control end of the first switch module, and the control electrode of the second switch device serves as the control end of the second switch module; the first output end of the control module is connected to the control electrode of the first switch device through the first drive circuit, and the first drive circuit is used to amplify the first control signal of the first output end and output it to the control electrode of the first switch device; the second output end of the control module is connected to the control electrode of the second switch device through the second drive circuit, and the second drive circuit is used to amplify the second control signal of the second output end and output it to the control electrode of the second switch device; the control module is used to determine whether at least one of the first switch device, the first drive circuit, the second switch device and the second drive circuit is faulty according to the voltage of the common terminal, the voltage between the first power supply terminal and the second power supply terminal, and whether the first control signal and the second control signal are output.

[0010] Optionally, the heating circuit also includes a temperature detection module, which is connected to the control module. The control module is also used to output a first control signal and a second control signal at the same time when the temperature detection module detects that the ambient temperature is lower than a preset value and the first switch module and the second switch module are both normal, so that the first switch module and the second switch module are both turned on.

[0011] Optionally, the first resistor module includes a first end and a second end and at least one first resistor connected in series to the first end and the second end, and the second resistor module includes a third end and a fourth end and at least one second resistor connected in series to the third end and the fourth end.

[0012] Optionally, the resistance value of the heating module is smaller than the resistance value of the first resistance module and smaller than the resistance value of the second resistance module; the control module is also used to confirm whether the resistance value of the heating module is equal to the set value when the first switch module and the second switch module are both normal.

[0013] Optionally, the heating module includes a heating resistor, and the heating resistor and at least two switch modules are connected in series between the first power supply terminal and the second power supply terminal.

[0014] In a second aspect, the utility model provides a battery, comprising a heating circuit and a battery body provided in any embodiment of the utility model, wherein the heating circuit is used to heat the battery body.

[0015] The heating circuit provided by the embodiment of the utility model includes at least two switch modules and a heating module. By setting at least two switch modules in series with the heating module, it is possible to avoid the heating module from malfunctioning when a single switch module in series with the heating module is short-circuited. By setting the types of switch devices included in the at least two switch modules to be different, the probability of the two switch modules being short-circuited at the same time can be reduced, further reducing the situation where the heating circuit malfunctions all the time, thereby reducing the power consumption of the heating circuit, reducing the situation where the battery temperature is too high, improving the reliability of the heating circuit, and improving the charging and discharging performance of the battery.

[0016] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a structural schematic diagram of a heating circuit provided by an embodiment of the utility model;

[0019] Figure 2 It is a structural schematic diagram of another heating circuit provided by an embodiment of the utility model;

[0020] Figure 3 It is a structural schematic diagram of another heating circuit provided by an embodiment of the utility model;

[0021] Figure 4 It is a structural schematic diagram of another heating circuit provided by an embodiment of the utility model;

[0022] Figure 5 It is a structural schematic diagram of another heating circuit provided by an embodiment of the utility model;

[0023] Figure 6 It is a structural schematic diagram of another heating circuit provided by an embodiment of the utility model;

[0024] Figure 7 It is a structural schematic diagram of another heating circuit provided by an embodiment of the utility model;

[0025] Figure 8 It is a structural schematic diagram of another heating circuit provided by an embodiment of the utility model;

[0026] Fig. 9 It is a structural schematic diagram of a battery provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0029] Figure 1 Schematic diagram of a heating circuit provided by an embodiment of the utility model. Figure 1 As shown, the heating circuit includes: at least two switch modules and a heating module 30 .

[0030] The heating module 30 and at least two switch modules are connected in series between the first power supply terminal DC+ and the second power supply terminal DC-, and the heating module 30 is used to generate heat when the switch modules are all turned on; wherein, the types of switch devices included in at least two switch modules are different. Figure 1 The case where at least two switch modules include a first switch module 10 and a second switch module 20 is schematically shown.

[0031] Specifically, the heating circuit provided by the utility model can be used to heat various objects to be heated. For example, the object to be heated can be a battery, that is, the heating circuit can heat the battery. The specific type of the object to be heated is not particularly limited in this application.

[0032] The switch module includes a mechanical switch, a switch that realizes on-off control through an electrical signal, or a switch that realizes on-off control according to the characteristics of the component itself. The switch module can be a unidirectional switch, such as a unidirectional switch composed of a bidirectional switch and a diode in series, or a bidirectional switch, such as a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) or an Insulated Gate Bipolar Transistor (IGBT) with an anti-parallel freewheeling diode.

[0033] It is understandable that the specific type of the switch module can be selected and set according to the actual application scenario, etc., as long as the types of the switch devices included in at least two switch modules are different, the utility model is not limited here. The types of at least two switch modules are different. In an optional embodiment, at least two switch modules can be different types of switch devices, for example, relays and MOS tubes respectively; in another optional embodiment, different types of switch elements of the same type, for example, the switch devices included in the switch module are all MOS tubes, but the channel types are different. For example, one is an N-type semiconductor device and the other is a P-type semiconductor device.

[0034] The heating module 30 may include any module that achieves energy consumption by hindering the flow of current, such as a resistor.

[0035] In some embodiments, in order to ensure the service life of the battery, the battery can be heated at low temperature. When the heating condition is reached, the first switch module 10 and the second switch module 20 are controlled to be turned on, and the heating module 30 starts to work to heat the battery. When the heating stop condition is reached, the first switch module 10 and the second switch module 20 are controlled to be turned off, and the heating module 30 stops working. In the actual application of the battery, as the environment changes, the heating condition and the heating stop condition of the battery can be set according to the actual environmental conditions to ensure the charging and discharging performance of the battery.

[0036] When the types of devices included in the first switch module 10 and the second switch module 20 are the same, the first switch module 10 and the second switch module 20 may be devices from the same batch, and the probability of simultaneous failure becomes higher. For example, when the first switch module 10 and the second switch module 20 are short-circuited at the same time, the heating resistor is always malfunctioning, resulting in excessive temperature of the battery, affecting the charge and discharge performance of the battery, and when the heating resistor is always malfunctioning, the power consumption of the heating circuit is large. The utility model reduces the probability of the first switch module 10 and the second switch module 20 being short-circuited at the same time by setting the types of switch devices included in the first switch module 10 and the second switch module 20 to be different, which is beneficial to avoid the heating circuit from malfunctioning all the time, thereby reducing the power consumption of the heating circuit and improving the charge and discharge performance of the battery.

[0037] The heating circuit provided by the embodiment of the utility model includes at least two switch modules and a heating module. By setting at least two switch modules in series with the heating module, it is possible to avoid the heating module from malfunctioning when a single switch module in series with the heating module is short-circuited. By setting the types of switch devices included in the at least two switch modules to be different, the probability of the two switch modules being short-circuited at the same time can be reduced, further reducing the situation where the heating circuit malfunctions all the time, thereby reducing the power consumption of the heating circuit, reducing the situation where the battery temperature is too high, improving the reliability of the heating circuit, and improving the charging and discharging performance of the battery.

[0038] The switch module has multiple implementation modes, and the present invention does not limit the implementation mode of the switch module. As an optional implementation mode provided in this embodiment, Figure 2 Schematic diagram of another heating circuit provided by the embodiment of the utility model. Figure 2 As shown, at least one switch module includes a relay 101 , and at least one switch module includes a transistor T1 . Figure 2 The case where the first switch module 10 includes a relay 101 and the second switch module 20 includes a transistor T1 is schematically shown.

[0039] The relay 101 includes a coil KM1 and a contact K1, a first end of the coil KM1 is connected to a first control signal CTR1, and a second end of the coil KM1 is grounded; a gate of the transistor T1 is connected to a second control signal CTR2, and the transistor T1, the contact K1 and the heating module 30 are connected in series. This arrangement makes the circuit simple, occupies a small system area, and is easy to implement.

[0040] In this embodiment, the transistor T1 is an N-type MOS transistor for illustration. In addition, the transistor T1 may also be any other suitable switch, such as a P-type MOS transistor, an NPN-type triode, a PNP-type triode, an insulated gate bipolar transistor (IGBT) device, an integrated gate commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device or a junction field effect transistor (JFET) device, etc.

[0041] Figure 3 Schematic diagram of another heating circuit provided by the embodiment of the utility model. Figure 3 As shown, optionally, the heating circuit further includes a control module 40, which is respectively connected to the control end of each switch module and is used to control the conduction state of the switch module.

[0042] Specifically, the at least two switch modules include a first switch module 10 and a second switch module 20. The control module 40 is connected to the control end of the first switch module 10 and the control end of the second switch module 20 respectively, and the control module 40 is used to output a first control signal CTR1 to the first switch module 10 to control the conduction state of the first switch module 10, and the control module 40 is also used to output a second control signal CTR2 to the second switch module 20 to control the conduction state of the second switch module 20.

[0043] The control module 40 can be implemented by using control devices such as a micro controller unit (MCU), a digital signal processor (DSP), and a field programmable gate array (FPGA).

[0044] Figure 4 It is a structural schematic diagram of another heating circuit provided by an embodiment of the utility model. Figure 5 This is a schematic diagram of the structure of another heating circuit provided by the embodiment of the utility model. Figure 4 and Figure 5 , at least two switch modules include a first switch module 10 and a second switch module 20 ; the heating module 30 is connected in series between the first switch module 10 and the second switch module 20 .

[0045] The heating circuit further includes a first resistance module 50 and a second resistance module 60. The first resistance module 50 is connected in parallel with the first switch module 10, and the second resistance module 60 is connected in parallel with the second switch module 20.

[0046] The control module 40 is also connected to the common terminal A1, the first power terminal DC+ and the second power terminal DC- of the first switch module 10 and the heating module 30 respectively. The control module 40 is used to output a first control signal CTR1 to the first switch module 10 to control the conduction state of the first switch module 10, and output a second control signal CTR2 to the second switch module 20 to control the conduction state of the second switch module 20.

[0047] The control module is also used to determine whether the first switch module 10 or the second switch module 20 has a fault according to the voltage of the common terminal A1, the voltage between the first power terminal DC+ and the second power terminal DC-, and whether the first control signal CTR1 and the second control signal CTR2 are output.

[0048] Specifically, the first resistor module 50 includes a first end and a second end and at least one first resistor R1 connected in series with the first end and the second end, and the second resistor module 60 includes a third end and a fourth end and at least one second resistor R2 connected in series with the third end and the fourth end.

[0049] In some embodiments, the heating module 30 includes a heating resistor Rh, and the heating resistor Rh and at least two switch modules are connected in series between the first power terminal DC+ and the second power terminal DC-.

[0050] The fault states of the first switch module 10 include open circuit and short circuit. When the control module 40 outputs only the first control signal CTR1, the first switch module 10 is closed and the second switch module 20 is open. At this time, if the control module 40 detects that the voltage Vheat of the common terminal A1 is Vdc, the control module 40 determines that the first switch module 10 is normal. At this time, if the control module 40 detects that the voltage Vheat of the common terminal A1 is (Vdc*(rheat+r2)) / (r1+rheat+r2), the control module 40 determines that the first switch module 10 is open circuit.

[0051] When the control module 40 does not output the first control signal CTR1 and the second control signal CTR2, the first switch module 10 is disconnected, and the second switch module 20 is disconnected. At this time, the control module 40 should detect that the voltage Vheat of the common terminal A1 is Vdc*(rheat+r2)) / (r1+rheat+r2), but if the control module 40 detects that the voltage Vheat of the common terminal A1 is Vdc, the control module 40 determines that the first switch module 10 is short-circuited.

[0052] The fault state of the second switch module 20 includes open circuit and short circuit. When the control module 40 outputs only the second control signal CTR2, the first switch module 10 is open and the second switch module 20 is closed. At this time, if the control module 40 detects that the voltage Vheat of the common terminal A1 is Vheat = (Vdc*(rheat)) / (r1+rheat), the control module 40 determines that the second switch module 20 is normal. At this time, if the control module 40 detects that the voltage Vheat of the common terminal A1 is Vheat = (Vdc*(rheat+r2)) / (r1+rheat+r2), the control module 40 determines that the second switch module 20 is open circuit.

[0053] When the control module 40 does not output the first control signal CTR1 and the second control signal CTR2, the first switch module 10 is disconnected, and the second switch module 20 is disconnected. At this time, the control module 40 should detect that the voltage Vheat of the common terminal A1 is Vdc*(rheat+r2) / (r1+rheat+r2), but if the control module 40 detects that the voltage Vheat of the common terminal A1 is Vdc*(rheat) / (r1+rheat), the control module 40 determines that the second switch module 20 is short-circuited.

[0054] Among them, Vheat represents the voltage of the common terminal A1 of the first switch module 10 and the heating module 30, Vdc represents the voltage between the first power supply terminal DC+ and the second power supply terminal DC-, rheat represents the resistance value of the heating module 30, r1 represents the resistance value of the first resistance module 50, and r2 represents the resistance value of the second resistance module 60.

[0055] Optionally, based on the above embodiment, continue to refer to Figure 4 , the resistance value of the heating module 30 is smaller than the resistance value of the first resistance module 50 , and smaller than the resistance value of the second resistance module 60 .

[0056] The control module 40 is also used to confirm whether the resistance value of the heating module 30 is equal to a set value when the first switch module 10 and the second switch module 20 are both normal.

[0057] Specifically, when the control module 40 does not output the first control signal CTR1 and the second control signal CTR2, that is, when the first switch module 10 and the second switch module 20 are disconnected:

[0058]

[0059] When r1 is greater than rheat, and r2 is greater than rheat, that is, when r1+r2 is greater than rheat, the power consumption of the heating circuit is very small. Therefore, by setting the resistance value of the heating module 30 to be smaller than the resistance value of the first resistance module 50 and smaller than the resistance value of the second resistance module 60, the power consumption of the heating circuit when not working can be reduced. Wherein, P represents the power of the heating circuit, and Vdc represents the voltage between the first power supply terminal DC+ and the second power supply terminal DC-.

[0060] When both the first switch module 10 and the second switch module 20 can work normally, the control module 40 can control the first switch module 10 and the second switch module 20 to be disconnected, that is, the first control signal CTR1 and the second control signal CTR2 are not outputted, and the control module 40 detects the voltage Vheat of the common terminal A1 at this time. Since the resistance value r1 of the first resistor module 50, the resistance value r2 of the second resistor module 60, the voltage Vdc between the first power supply terminal DC+ and the second power supply terminal DC-, and the voltage Vheat of the common terminal A1 are all known quantities, the resistance value rheat of the heating module 30 can be determined according to the calculation formula Vheat=(Vdc*(rheat+r2)) / (r1+rheat+r2). When the control module 40 determines that the resistance value rheat of the heating module 30 is equal to the set value, it is determined that the entire heating circuit is normal. At this time, the control module 40 can simultaneously output the first control signal CTR1 and the second control signal CTR2 to control the first switch module 10 and the second switch module 20 to be closed, thereby turning on the heating module 30 to heat the object to be heated.

[0061] Figure 6 is a schematic diagram of another heating circuit provided by an embodiment of the utility model. Optionally, based on the above embodiment, as Figure 6 As shown, the first switch module 10 includes a first switch device 110 and a first drive circuit 70, and the second switch module 20 includes a second switch device 210 and a second drive circuit 80; the control electrode of the first switch device 110 serves as the control end of the first switch module 10, and the control electrode of the second switch device 210 serves as the control end of the second switch module 20.

[0062] The first output end of the control module 40 is connected to the control end of the first switch module 10 through the first drive circuit 70, and the first drive circuit 70 is used to amplify the first control signal CTR1 of the first output end and output it to the control electrode of the first switch device 110; the second output end of the control module 40 is connected to the control end of the second switch device 210 through the second drive circuit 80, and the second drive circuit 80 is used to amplify the second control signal CTR2 of the second output end and output it to the control electrode of the second switch device 210.

[0063] The control module 40 is used to determine whether there is a fault in the first switching device 110 and the first drive circuit 70, the second switching device 210 and the second drive circuit 80 according to the voltage size of the common terminal A1, the voltage between the first power terminal DC+ and the second power terminal DC-, and whether the first control signal CTR1 and the second control signal CTR2 are output.

[0064] Specifically, the first switch device 110 and the second switch device 210 have multiple implementations, and the present invention does not limit the implementation of the first switch device 110 and the second switch device 210. As an optional implementation provided in this embodiment, Figure 7 Schematic diagram of another heating circuit provided by the embodiment of the utility model. Figure 7 As shown, the first switching device 110 includes a relay 101, and the second switching device 210 includes a transistor T1.

[0065] The relay 101 includes a coil KM1 and a contact K1. The first end of the coil KM1 serves as a control electrode of the first switch device 110 and is connected to a first control signal CTR1. The second end of the coil KM1 is grounded.

[0066] The gate of transistor T1 is used as the control electrode of the second switch device 210 and receives the second control signal CTR2. Transistor T1, contact K1 and heating module 30 are connected in series. This arrangement makes the circuit simple, occupies a small system area and is easy to implement.

[0067] The first drive circuit 70 and the second drive circuit 80 may be various modules with a signal amplification function. The structures of the first drive circuit 70 and the second drive circuit 80 may be the same or different. Exemplarily, the first drive circuit 70 and the second drive circuit 80 may both include a switch tube.

[0068] Combination Figure 6 and Figure 7 , the fault state of the first switch device 110 includes open circuit and short circuit. When the control module 40 only outputs the first control signal CTR1, the first switch device 110 is closed and the second switch device 210 is disconnected, that is, the contact K1 of the relay 101 is closed and the transistor T1 is disconnected. At this time, if the control module 40 detects that the voltage Vheat of the common terminal A1 is Vdc, the control module 40 determines that the first switch device 110 and the first drive circuit 70 are normal. At this time, if the control module 40 detects that the voltage Vheat of the common terminal A1 is (Vdc*(rheat+r2)) / (r1+rheat+r2), the control module 40 determines that the first switch device 110 is open circuit. The open circuit of the first switch device 110 may be caused by the open circuit of the first switch device 110 itself, or by a fault of the first drive circuit 70.

[0069] When the control module 40 does not output the first control signal CTR1 and the second control signal CTR2, the first switch device 110 is disconnected, the second switch device 210 is disconnected, that is, the contact K1 of the relay 101 is disconnected, and the transistor T1 is disconnected. At this time, the control module 40 should detect that the voltage Vheat of the common terminal A1 is Vdc*(rheat+r2)) / (r1+rheat+r2), but if the control module 40 detects that the voltage Vheat of the common terminal A1 is Vdc, the control module 40 determines that the first switch device 110 is short-circuited. The short circuit of the first switch device 110 may be caused by the short circuit of the first switch device 110 itself, or by a fault of the first drive circuit 70.

[0070] The fault state of the second switch device 210 includes open circuit and short circuit. When the control module 40 outputs only the second control signal CTR2, the first switch device 110 is disconnected and the second switch device 210 is closed, that is, the contact K1 of the relay 101 is disconnected and the transistor T1 is closed. At this time, if the control module 40 detects that the voltage Vheat of the common terminal A1 is Vheat = (Vdc*(rheat)) / (r1+rheat), the control module 40 determines that the second switch device 210 and the second drive circuit 80 are normal. At this time, if the control module 40 detects that the voltage Vheat of the common terminal A1 is Vheat = (Vdc*(rheat+r2)) / (r1+rheat+r2), the control module 40 determines that the second switch device 210 is open circuit. The open circuit of the second switch device 210 may be caused by the open circuit of the second switch device 210 itself, or by the failure of the second drive circuit 80.

[0071] When the control module 40 does not output the first control signal CTR1 and the second control signal CTR2, the first switch device 110 is disconnected, and the second switch device 210 is disconnected, that is, the contact K1 of the relay 101 is disconnected, and the transistor T1 is disconnected. At this time, the control module 40 should detect that the voltage Vheat of the common terminal A1 is Vdc*(rheat+r2)) / (r1+rheat+r2). However, if the control module 40 detects that the voltage Vheat of the common terminal A1 is Vdc*(rheat)) / (r1+rheat), the control module 40 determines that the second switch device 210 is short-circuited. The short circuit of the second switch device 210 may be caused by the short circuit of the second switch device 210 itself, or by a fault in the second drive circuit 80.

[0072] Among them, Vheat represents the voltage of the common terminal A1 of the first switch module 10 and the heating module 30, Vdc represents the voltage between the first power supply terminal DC+ and the second power supply terminal DC-, rheat represents the resistance value of the heating module 30, r1 represents the resistance value of the first resistance module 50, and r2 represents the resistance value of the second resistance module 60.

[0073] Figure 8 is a schematic diagram of another heating circuit provided by an embodiment of the utility model. Figure 8 As shown, the heating circuit also includes a temperature detection module 90, which is connected to the control module 40. The control module 40 is also used to output the first control signal CTR1 and the second control signal CTR2 at the same time when the temperature detection module 90 detects that the ambient temperature is lower than a preset value and the first switch module 10 and the second switch module 20 are both normal, so that the first switch module 10 and the second switch module 20 are both turned on.

[0074] Specifically, the temperature detection module 90 is used to detect the ambient temperature of the object to be heated in real time, and convert the ambient temperature signal into an electrical signal and transmit it to the control module 40. In an optional embodiment, the temperature detection module 80 includes a temperature sensor and an analog-to-digital converter, wherein the temperature sensor is used to detect the ambient temperature of the object to be heated and output an analog electrical signal; the analog-to-digital converter is used to convert the analog electrical signal into a binary digital temperature signal (i.e., an electrical signal) and output it to the control module 40.

[0075] In this embodiment, the preset value can be a value less than zero, that is, when the control module 40 detects that the ambient temperature is less than zero degrees Celsius, and the first switch module 10 and the second switch module 20 are both normal, the control module 40 will simultaneously output the first control signal CTR2 and the second control signal CTR2 to control the first switch module 10 and the second switch module 20 to be turned on at the same time to heat the object to be heated.

[0076] Exemplarily, the first switch module 10 includes a first switch device 110 and a first drive circuit 70, and the second switch module 20 includes a second switch device 210 and a second drive module 80. The first switch device 110 includes a relay 101, and the second switch device 210 includes a transistor T1. When the relay 101, the transistor T1, the first drive circuit 70 and the second drive circuit 80 can all work normally, the control module 40 can control the relay 101 and the transistor T1 to be disconnected, that is, the first control signal CTR1 and the second control signal CTR2 are not output, and the control module 40 detects the voltage Vheat of the common terminal A1. Since the resistance value r1 of the first resistor module 50, the resistance value r2 of the second resistor module 60, the voltage Vdc between the first power supply terminal DC+ and the second power supply terminal DC-, and the voltage Vhe at the common terminal A1 are all known quantities, the resistance value rheat of the heating resistor Rh can be determined according to the calculation formula Vheat=(Vdc*(rheat+r2)) / (r1+rheat+r2). When the control module 40 determines that the resistance value rheat of the heating resistor Rh is equal to the set value, it is determined that the entire heating circuit is normal. At this time, the control module 40 can simultaneously output the first control signal CTR1 and the second control signal CTR2 to control the relay 101 and the transistor T1 to close, thereby turning on the heating resistor Rh to heat the object to be heated.

[0077] Based on the same utility model concept, the utility model also provides a battery, Fig. 9 This is a schematic diagram of the structure of a battery provided by the utility model. Fig. 9 As shown, the battery includes a heating circuit 1 and a battery body 2 provided in any of the above embodiments. The heating circuit 1 is used to heat the battery body 2, and the similarities are not repeated here.

[0078] For example, continue to refer to Fig. 9 The heating circuit 1 includes: a first switch module 10, a second switch module 20, a heating module 30, a control module 40, a first resistor module 50 and a second resistor module 60. The control module 40 is used to output a first control signal and a second control signal at the same time when the ambient temperature is lower than a preset value, the battery body 2 needs to be charged and discharged, and the first switch module 10 and the second switch module 20 are both normal, so that the first switch module 10 and the second switch module 20 are both turned on, thereby turning on the heating module 30 to heat the battery body 2.

[0079] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A heating circuit, characterized in that: include: At least two switch modules and a heating module; The heating module and at least two of the switch modules are connected in series between the first power supply terminal and the second power supply terminal, and the heating module is used to generate heat when the switch modules are all turned on; Wherein, at least two of the switch modules include switch devices of different types.

2. The heating circuit according to claim 1, characterized in that: At least one of the switch modules comprises a relay, and at least one of the switch modules comprises a transistor; The relay comprises a coil and a contact, a first end of the coil is connected to a first control signal, and a second end of the coil is grounded; The gate of the transistor is connected to a second control signal, and the transistor, the contact and the heating module are connected in series.

3. The heating circuit according to claim 1, characterized in that: It also includes a control module, which is connected to the control end of each switch module respectively and is used to control the conduction state of the switch module.

4. The heating circuit according to claim 3, characterized in that: At least two of the switch modules include a first switch module and a second switch module; the heating module is connected in series between the first switch module and the second switch module; The heating circuit also includes a first resistance module and a second resistance module; The first resistance module is connected in parallel with the first switch module; The second resistance module is connected in parallel with the second switch module; The control module is also connected to the first switch module and the common end of the heating module, the first power supply end and the second power supply end respectively, and the control module is used to output a first control signal to the first switch module to control the conduction state of the first switch module, and output a second control signal to the second switch module to control the conduction state of the second switch module; The control module is also used to determine whether the first switch module or the second switch module has a fault according to the voltage of the common terminal, the voltage between the first power terminal and the second power terminal, and whether the first control signal and the second control signal are output.

5. The heating circuit according to claim 4, characterized in that: The first switch module includes a first switch device and a first drive circuit, and the second switch module includes a second switch device and a second drive circuit; the control electrode of the first switch device serves as the control end of the first switch module, and the control electrode of the second switch device serves as the control end of the second switch module; The first output terminal of the control module is connected to the control electrode of the first switch device through the first drive circuit, and the first drive circuit is used to amplify the first control signal of the first output terminal and output it to the control electrode of the first switch device; The second output end of the control module is connected to the control electrode of the second switch device through the second drive circuit, and the second drive circuit is used to amplify the second control signal of the second output end and output it to the control electrode of the second switch device; The control module is used to determine whether there is a fault in at least one of the first switching device, the first drive circuit, the second switching device and the second drive circuit based on the voltage size of the common terminal, the voltage between the first power supply terminal and the second power supply terminal, and whether the first control signal and the second control signal are output.

6. The heating circuit according to claim 4, characterized in that: It also includes a temperature detection module, which is connected to the control module. The control module is also used to output the first control signal and the second control signal at the same time when the temperature detection module detects that the ambient temperature is lower than a preset value and the first switch module and the second switch module are both normal, so that the first switch module and the second switch module are both turned on.

7. The heating circuit according to claim 4, characterized in that: The first resistor module includes a first end and a second end and at least one first resistor connected in series between the first end and the second end. The second resistor module includes a third end and a fourth end and at least one second resistor connected in series between the third end and the fourth end.

8. The heating circuit according to claim 4, characterized in that: The resistance value of the heating module is smaller than the resistance value of the first resistance module, and smaller than the resistance value of the second resistance module; The control module is further used to confirm whether the resistance value of the heating module is equal to a set value when the first switch module and the second switch module are both normal.

9. The heating circuit according to claim 1, characterized in that: The heating module comprises a heating resistor, and the heating resistor and at least two switch modules are connected in series between a first power supply terminal and a second power supply terminal.

10. A battery, characterized in that: It comprises the heating circuit according to any one of claims 1 to 9 and a battery body, wherein the heating circuit is used to heat the battery body.

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