Battery temperature monitoring circuit, battery and energy storage device

Abstract

The utility model discloses a battery temperature monitoring circuit, a battery and an energy storage device, and relates to the technical field of battery monitoring, the battery temperature monitoring circuit comprises a plurality of thermistor branches connected in parallel, each thermistor branch comprises at least one thermistor (10), and the at least one thermistor (10) is used for monitoring the temperature of the battery. According to the battery temperature monitoring method and device, the technical problem that the monitoring accuracy is low when the battery temperature is monitored through a thermistor in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery monitoring, in particular to a battery temperature monitoring circuit, a battery and an energy storage device. BACKGROUND

[0002] In the related art, batteries are widely used in the field of electric vehicles. Therefore, when an electric vehicle is powered by a battery, the safety of the battery is particularly important. The temperature of the battery is an important basis for determining whether the battery can work normally. In the prior art, the temperature of a battery pack is usually measured by one or more temperature sensors, and each sensor needs its own sensing line.

[0003] However, in the actual measurement process, due to the large gap between multiple temperature sensors, the heat conduction between the batteries is relatively poor, so when the battery overheats, the temperature sensor will have the technical problems of long reaction time, uneven reaction time and sensitivity. In addition, when one of the multiple sensors is damaged, the temperature of the battery cannot be measured, which will affect the normal operation of the vehicle.

[0004] In view of the above technical problems, no effective solution has been proposed so far. CONTENT OF THE INVENTION

[0005] The main purpose of the present application is to provide a battery temperature monitoring circuit to solve the technical problem of low monitoring accuracy when monitoring the temperature of the battery by using a thermistor in the related art.

[0006] In order to achieve the above purpose, according to one aspect of the present application, a battery temperature monitoring circuit is provided, which comprises: a plurality of parallel thermistor branches, each thermistor branch comprising at least one thermistor (10), and the at least one thermistor (10) is used to monitor the temperature of the battery.

[0007] Further, the battery temperature monitoring circuit further comprises: a resistor (20), the input end of the battery temperature monitoring circuit is connected with the first end of the resistor (20), the second end of the resistor (20) is connected with the first output end of the power supply, and the output end of the battery temperature monitoring circuit is connected with the second output end of the power supply.

[0008] Further, the battery temperature monitoring circuit further comprises: the power supply is a voltage source (30).

[0009] Further, the battery temperature monitoring circuit further comprises: the at least one thermistor (10) is electrically isolated from the bus or the collection terminal, and the at least one thermistor (10) is thermally connected with the bus or the collection terminal.

[0010] Further, the battery temperature monitoring circuit further comprises: at least one thermistor (10) is pasted on the bus bar or the collection terminal, or, at least one thermistor (10) is welded on the bus bar or the collection terminal.

[0011] According to an aspect of the present application, a battery is provided, the battery comprising: the battery comprises the battery temperature monitoring circuit in any one of the above.

[0012] Further, the battery further comprises: the battery further comprises a plurality of battery cells (40), the plurality of battery cells (40) are connected in parallel, and at least one parallel branch of the battery is provided with at least one battery temperature monitoring circuit for temperature monitoring.

[0013] Further, the battery further comprises: the plurality of battery cells (40) are connected in parallel, and at least one parallel branch of the battery is provided with at least one thermistor (10) for temperature monitoring.

[0014] Further, the battery further comprises: the ratio of the number of at least one thermistor (10) to the number of the plurality of battery cells (40) ranges from 10 to 1 / 20.

[0015] Further, the battery further comprises: the ratio ranges from 10 to 1 / 8.

[0016] Further, the battery further comprises: at least one thermistor (10) is electrically isolated from the battery cell (40), and at least one thermistor (10) is thermally connected to the battery cell (40).

[0017] Further, the battery further comprises: at least one thermistor (10) is pasted on the battery cell (40).

[0018] Further, the battery further comprises: the plurality of battery cells (40) are connected in parallel first and then connected in series, wherein the number of series branches of the plurality of battery cells (40) ranges from 2 to 50, and the number of parallel branches of each series branch ranges from 1 to 12.

[0019] According to an aspect of the present application, an energy storage device is provided, the energy storage device comprising the battery described above.

[0020] In the above method, by connecting a plurality of parallel thermistor branches, and each parallel resistance branch comprises at least one thermistor, and connecting one resistance to the temperature monitoring circuit comprising the plurality of parallel thermistor branches, the technical effect of improving the accuracy of battery temperature monitoring can be achieved when one of the thermistors fails during the process of monitoring the battery temperature by the battery temperature monitoring circuit, without affecting the results of the entire temperature monitoring circuit.

[0021] Therefore, the scheme provided in the application achieves the purpose of monitoring the battery temperature by using multiple parallel thermistor branches, thereby achieving the technical effect of improving the accuracy of battery temperature measurement results, thereby solving the technical problem that in the prior art, the failure of one thermistor in the battery temperature monitoring circuit causes the battery temperature monitoring circuit to have inaccurate measurement results during the monitoring of the battery temperature. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and are used to interpret the illustrative embodiments of the present application and their descriptions, and do not constitute improper limitations to the present application. In the drawings:

[0023] Figure 1 is a schematic diagram of a battery temperature monitoring circuit provided according to an embodiment of the present application Figure 1 ;

[0024] Figure 2 is a schematic diagram of a battery temperature monitoring circuit provided according to an embodiment of the present application Figure 2 ;

[0025] Figure 3 is a schematic diagram of a battery temperature monitoring circuit provided according to an embodiment of the present application Figure 3 ;

[0026] Figure 4 is a schematic diagram of a battery provided according to an embodiment of the present application

[0027] Figure 5 is a schematic diagram of the response of different numbers of resistors in the battery temperature monitoring circuit according to an embodiment of the present application when having the same equivalent resistance value Figure 1 ;

[0028] Figure 6 is a schematic diagram of the response of different numbers of resistors in the battery temperature monitoring circuit according to an embodiment of the present application when having the same equivalent resistance value Figure 2 .

[0029] In the drawings, 10 is a thermistor, 20 is a resistor, 30 is a voltage source, and 40 is an electric core. DETAILED DESCRIPTION

[0030] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] In order to enable a person skilled in the art to better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative labor should fall within the scope of protection of the present application.

[0032] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the terms used in this way for the embodiments of the present application can be interchanged as appropriate. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, products or devices.

[0033] The utility model is explained below, Figure 1 It is the schematic diagram of battery temperature monitoring circuit provided by the embodiments of the present application, as Figure 1 The battery temperature monitoring circuit comprises: a plurality of parallel thermistor branches, each thermistor branch comprising at least one thermistor 10, and the at least one thermistor 10 being used to monitor the temperature of the battery.

[0034] In the embodiment, a plurality of thermistor branches are connected in parallel, wherein each thermistor branch comprises at least one thermistor 10, and the at least one thermistor 10 is used to monitor the temperature of the battery.

[0035] Compared with the method of using one NTC (negative temperature coefficient sensor) for each sensing line (sensing input end in BMS), the present application uses a group of parallel connected thermistor branches, wherein each thermistor branch comprises at least one thermistor 10. At the same time, the number of parallel branches is variable, and the number depends on the physical model of the battery. The number of signal outputs remains unchanged or can be reduced, and the output signal is an electrical signal from the temperature measurement unit. The above output signal value is determined by the battery temperature.

[0036] Optionally, the signal output end is connected with the signal detection element of the battery management unit. Since the battery temperature monitoring circuit is based on the principle of voltage divider, the output signal is voltage, and has a clear corresponding relationship with temperature. The voltage output can be read by various voltage signal detectors, and the temperature characteristics of the NTC element resistance are determined according to the production setting of the NTC.

[0037] It is worth mentioning that the resistance value of the NTC can be set to any value, but for the convenience of comparison, the equivalent resistance value of the parallel NTC group can be set to the same as the resistance value of a single NTC, for example, as shown in Figure 5 and Figure 6 a 10-kilohm thermistor compared with three 30-kilohm thermistors in parallel (equivalent resistance value of 10 kilohm) and six 60-kilohm thermistors in parallel (equivalent resistance value of 10 kilohm), as long as the equivalent resistance value and temperature characteristics of each group of NTCs are the same, there is no difference in response time of the three groups of thermistors when the heat is evenly distributed in the entire battery.

[0038] As shown in Figure 5 and Figure 6 , when the battery temperature rises, the change of the measured voltage (which can be converted into a temperature value in the control software (SW)) is measured. Figure 5 and Figure 6 indicate that the above voltage change curves are the same in the three cases (one 10-kilohm NTC, three 30-kilohm NTCs in parallel, and six 60-kilohm NTCs in parallel).

[0039] Specifically, the thermistor is a sensor resistor whose resistance value changes with temperature. Thermistors are divided into positive temperature coefficient thermistors and negative temperature coefficient thermistors. The resistance value of a positive temperature coefficient thermistor increases with temperature, while the resistance value of a negative temperature coefficient thermistor decreases with temperature. The types of thermistors include semiconductor thermistors, metal thermistors, and alloy thermistors. The thermistor 10 in this application is taken as an example of a negative temperature coefficient thermistor (NTC).

[0040] Optionally, the temperature sensing principle of NTC resistance is based on the characteristics of semiconductor materials. The conductivity of metal oxide material is positively correlated with temperature, that is, as the temperature rises, the conductivity will rise. The resistance value of NTC resistance is inversely proportional to the conductivity, so as the temperature rises, the resistance value of NTC resistance will decrease. When the NTC resistance is connected to the circuit, there will be a certain current passing through the NTC resistance in the circuit. According to Ohm's law, a certain voltage drop will be generated when the current passes through the resistance. When the temperature rises, the resistance value of the NTC resistance decreases, resulting in a decrease in the voltage drop of the current passing through the NTC resistance. By measuring the change of the voltage, the change of the battery temperature can be inferred. Therefore, the resistance value of the NTC resistance can be measured first, and then the temperature-resistance table or a specific temperature-resistance conversion algorithm can be used to further determine the numerical value of the battery temperature, so as to achieve the technical effect of monitoring the temperature of the battery by the NTC resistance.

[0041] Optionally, the NTC resistor can transmit a voltage signal to a temperature processor, and the temperature processor can receive and process the voltage signal to obtain the temperature value of the battery.

[0042] The scheme effectively realizes the technical effect that when one thermistor 10 fails, the result of the whole temperature monitoring circuit is not affected through the corresponding SW algorithm during the process of monitoring the battery temperature by the battery temperature monitoring circuit. Meanwhile, the SW algorithm can also detect the failure of one or more thermistors 10.

[0043] It is worth noting that in the prior art, one temperature sensor or multiple series-connected temperature sensors are generally used to monitor the battery temperature. For the first case, the reaction time of one temperature sensor is relatively long when monitoring the battery temperature, and if the temperature sensor is damaged, the battery temperature cannot be monitored any more, thereby causing the technical problem that the battery temperature cannot be monitored in real time and accurately. For the second case, since the resistance of the multiple series-connected temperature sensors is equal to the sum of the resistances of the temperature sensors, in the actual use process, if one or more temperature sensors are lower than the actual value due to working conditions or other reasons, the resistance value in the total circuit is less than the actual value, and the alarm cannot be effectively triggered. For example, there are four temperature sensors in the circuit, the alarm temperature is 100℃, and the corresponding resistance value is 100Ω. In the ideal case, the four temperature sensors simultaneously measure the temperature of 100℃, and the total circuit resistance value is 400Ω when the alarm is triggered. However, in the actual process, there may be 101Ω, 101Ω, 101Ω, and 96Ω. At this time, although three temperature sensors measure the temperature of 101℃, which is greater than 100℃, the system is in danger of over-temperature, but since the total resistance in the circuit is 399Ω, which is less than 400Ω, the circuit cannot effectively trigger the alarm.

[0044] Optionally, the temperature monitoring circuit in the present application can continue to measure the battery temperature when the NTC sensor fails. In addition, the present application can also detect the number of damaged NTC sensors.

[0045] That is, the temperature measurement can still continue in the case of one or more damaged sensors, because the circuit of the sensing circuit is not damaged. The damage of the sensor will cause the shift of the detection signal level, but since the thermistors 10 in the circuit are connected in parallel and the broken NTC has very high impedance, the temperature dependence of other parts of the circuit remains unchanged.

[0046] It is worth noting that the high impedance of the NTC is related to very low temperatures (usually far below -40℃), so the software can detect it as a physical break, rather than a real situation. The only exception is that all temperature sensors are damaged, but the risk of all elements being damaged decreases as the number of elements increases.

[0047] In an alternative embodiment, as shown in Figure 2 the battery temperature monitoring circuit further comprises a resistor 20, the input end of the battery temperature monitoring circuit is connected with the first end of the resistor 20, the second end of the resistor 20 is connected with the first output end of the power supply, and the output end of the battery temperature monitoring circuit is connected with the second output end of the power supply.

[0048] Specifically, the battery temperature monitoring circuit further comprises a resistor 20, wherein the first end of the resistor 20 is connected with the input end of the battery temperature monitoring circuit, and the second end of the resistor 20 is connected with the first output end of the power supply. It is worth noting that the output end of the battery temperature monitoring circuit should be connected with the second output end of the power supply.

[0049] Specifically, the resistor 20 is connected in series with the NTC sensor circuit, and forms a voltage division with the NTC sensor circuit, that is, the voltage of the entire series circuit is the sum of the voltages of the resistor 20 and the NTC sensor parallel circuit. When the temperature of the battery changes, since the thermistor 10 is arranged on the battery, the resistance value of the thermistor 10 in the NTC sensor circuit changes with the change of the temperature of the battery, thereby changing the voltage division of the NTC sensor circuit. The above change can be used to determine the temperature variable by testing the voltage across the resistor 20 (because the resistance value of the resistor 20 is fixed), and then converting the temperature change into the voltage division variable measured across the resistor 20, so as to obtain the temperature variable of the battery.

[0050] In addition, if the NTC sensor fails, the application can not only detect the failure in time, but also continue to measure the battery temperature. At the same time, the application can also detect the number of damaged NTC sensors through a corresponding algorithm.

[0051] Optionally, the resistor 20 and the plurality of thermistors 10 form a voltage division circuit, wherein the resistor 20 can play a role in distributing voltage in the voltage division circuit to adjust the voltage distributed by the temperature monitoring circuit.

[0052] Optionally, the role of resistance voltage division in the circuit is to distribute voltage according to a certain proportion, and to divide the input voltage into different voltage values. It is a commonly used circuit technology, often used for voltage comparison, signal transmission, potential level adjustment or voltage reduction in circuits. By selecting the appropriate resistance ratio, the voltage can be divided into the appropriate ratio as needed to ensure that the device is working properly without being damaged. In addition, resistance voltage division can also be used for voltage comparison and voltage adjustment in circuits. By connecting resistors of different resistance values together, the voltage can be compared to different voltage ranges according to the voltage division principle. This is often used in analog circuits, sensor interfaces and circuit regulation. It should be noted that resistance voltage division will introduce power consumption and current loss. Since current passing through the resistor generates power consumption, the resistance value and power capacity of the resistor need to be selected reasonably in the design to ensure the stability and reliability of the circuit.

[0053] It should be noted that the resistance 20 only plays a role in voltage division in the circuit, so the position of the resistance 20 in the voltage division circuit does not need to be considered, i.e. the output end of the power supply can be connected to the first end of the resistance 20, and the second end of the resistance 20 is connected to the battery temperature monitoring circuit. Similarly, the output end of the power supply can also be connected to the input end of the battery temperature monitoring circuit, and the output end of the battery temperature monitoring circuit is connected to the first end of the resistance 20.

[0054] In an alternative embodiment, as shown in Figure 3 the battery temperature monitoring circuit further comprises a power supply, which is a voltage source 30.

[0055] Optionally, the types of power supplies can be divided into current sources and voltage sources. In general, the type of power supply or polarization is not specifically limited in this application. To achieve the function of the power supply in this application, the above-mentioned power supply can be a voltage source or a current source.

[0056] Specifically, the power supply, i.e. the power supply that can provide voltage, is the most common type of power supply in life, dry batteries, lead-acid batteries, lithium batteries are this type of power supply. It is worth noting that the power supply is not allowed to be short-circuited, otherwise it will cause excessive current, heat and burn the power supply or circuit. However, in test and measurement applications, an ideal voltage source is generally used. If the internal resistance of the voltage source is equal to zero, it is called an ideal voltage source. The output terminal voltage value of the ideal voltage source is equal to the electromotive force of the power supply, and is independent of the output current.

[0057] Specifically, since a rated voltage value needs to be provided across the temperature monitoring circuit in this application, the power supply used in this application is a voltage source to ensure stable voltage output.

[0058] In an alternative embodiment, at least one thermistor 10 is electrically isolated from the bus or collection terminal or cell 40, and at least one thermistor 10 is thermally connected to the bus or collection terminal or cell 40.

[0059] Specifically, the thermistor 10 is electrically isolated from the busbar or the collection terminal, thereby preventing electrical short circuit between the low-voltage direct-current sensing circuit and the high-voltage direct-current power supply circuit, while still allowing transmission of signals and power.

[0060] Meanwhile, the thermistor 10 is connected to the busbar or the collection terminal or the battery cell 40 in a thermal connection manner.

[0061] Optionally, the electrical isolation is to separate the low-voltage detection circuit from the high-voltage power supply circuit in terms of power, that is, to separate the power supply branch circuit from the entire power system, so as to form an electrically isolated and independent ungrounded safety system, thereby preventing the danger of electrical short circuit and avoiding abnormal current flow and temperature rise caused thereby, so as to cause problems such as abnormal discharge of the battery, thermal event or thermal runaway of the battery. The main function of the electrical isolation is to reduce the interference between two different circuits. For example, when the entire control system is powered by one power supply, if a device or circuit at a certain position fails, for example, a short circuit fault, in the moment of short circuit, a large current may break through multiple devices, thereby causing the entire system to completely malfunction.

[0062] In an optional embodiment, the at least one thermistor 10 is adhered to the busbar or the collection terminal or the battery cell 40, or the at least one thermistor 10 is welded to the busbar or the collection terminal or the battery cell 40.

[0063] Optionally, the at least one thermistor 10 is fixed on the busbar, the collection terminal or the battery.

[0064] Specifically, the thermistor 10 can be configured to be adhered to the busbar or the collection terminal or the battery cell 40, or can be configured to be welded to the busbar or the collection terminal or the battery cell 40, thereby ensuring that the thermistor 10 can form a battery temperature monitoring circuit to monitor the temperature of the battery. Meanwhile, multiple thermistors 10 can be used to cover a wide area to control the temperature.

[0065] Optionally, the number of components on the circuit board varies according to the complexity of the circuit and the application scenario, and generally, a simple circuit can have only a few components, while a complex circuit can have hundreds of components. The components on the fixed circuit board can be fixed by using multiple methods, of which the most commonly used methods are welding technology and glue adhering technology or through screw connection.

[0066] It is worth noting that in the present application, the thermistor 10 can be fixed on the busbar or the collection terminal by using any one of the above two methods, which is not limited here.

[0067] In an optional embodiment, the present application further provides a battery, such as Figure 4As shown, the battery further comprises a plurality of battery cells 40 connected in parallel, and at least one battery temperature monitoring circuit is arranged on at least one parallel branch of the battery for temperature monitoring.

[0068] Specifically, the battery temperature monitoring circuit provided by the present application is used for monitoring the temperature of a battery, wherein the battery comprises a plurality of battery cells 40 connected in parallel, and at least one temperature monitoring circuit mentioned above is arranged on at least one parallel branch of the battery.

[0069] As shown, Figure 4 At least one thermistor 10 is arranged at points T1, T2, T3, etc. to monitor the temperature of the battery. It should be noted that at least one thermistor 10 is not necessarily arranged at each point, and similarly, multiple thermistors 10 can be arranged at one point. The number and arrangement points of the thermistors 10 can be determined according to the actual working conditions and are not limited here.

[0070] In an alternative embodiment, the plurality of battery cells 40 are connected in parallel, and at least one thermistor 10 is arranged on at least one parallel branch of the battery for temperature monitoring.

[0071] In this embodiment, the plurality of battery cells 40 are connected in parallel to form a plurality of parallel branches, and at least one thermistor 10 is arranged on the parallel branch of the battery to monitor the temperature of the battery.

[0072] In an alternative embodiment, the ratio of the number of at least one thermistor 10 to the number of the plurality of battery cells 40 ranges from 10 to 1 / 20.

[0073] In this embodiment, the number of thermistors 10 is proportional to the number of battery cells 40, ranging from 10 NTC sensors corresponding to each battery cell 40 to 1 NTC sensor corresponding to every 20 battery cells 40.

[0074] Optionally, when the number of NTCs in the same battery pack is increased by 3 times, the detection time of the thermal event will be shortened by 10 times. For example, for a battery pack with 16 NTC sensors, when the number of NTCs is increased to more than 48 sensors, the detection time of the thermal event will be shortened by 10 times.

[0075] In an alternative embodiment, the ratio of the number of at least one thermistor 10 to the number of the plurality of battery cells 40 ranges from 10 to 1 / 8.

[0076] Optionally, the number of NTC temperature sensors is proportional to the number of battery cells 40, and one battery cell 40 can correspond to 10 to 1 / 8 NTC temperature sensors.

[0077] In an alternative embodiment, the at least one thermistor 10 is electrically isolated from the battery cell 40 and the at least one thermistor 10 is thermally connected to the battery cell 40.

[0078] In this embodiment, the thermistor 10 is electrically isolated from the battery cell 40, thereby preventing an electrical short between the low-voltage DC sensing circuit (thermistor 10) and the high-voltage DC power circuit (battery cell 40) while still allowing the transmission of signals and power.

[0079] At the same time, the connection between the thermistor 10 and the battery cell 40 is a thermal connection, which has a lower requirement for temperature control, thereby making it easier to connect the thermistor 10 to the battery cell 40.

[0080] In an alternative embodiment, the at least one thermistor 10 is adhered to the battery cell 40.

[0081] In this embodiment, the thermistor 10 is connected to the battery cell 40 by adhesion.

[0082] It is worth noting that the thermistor 10 can be connected to the busbar or the collection terminal by either adhesion or welding, but the thermistor 10 can only be adhered to the battery cell 40. Since the thermistor 10 needs to monitor the temperature of the battery cell 40, adhesion makes it easier to disassemble and install the thermistor 10. In addition, a high temperature is required during welding, which can easily damage the battery cell 40, so it is not recommended to use welding to connect the thermistor 10 and the battery cell 40.

[0083] In an alternative embodiment, the plurality of battery cells 40 are first connected in parallel and then connected in series, wherein the number of series branches of the plurality of battery cells 40 ranges from 2 to 50, and the number of parallel branches in each series branch ranges from 1 to 12.

[0084] In this embodiment, the plurality of battery cells 40 can be connected in parallel first and then connected in series, the number of series branches of the plurality of battery cells 40 can be 2-50, and the number of parallel battery cells 40 in each series branch of the battery cell 40 can be 1-12.

[0085] Optionally, in an ideal case, the number of series branches of the plurality of battery cells 40 can be 2 to ∞, and optionally, in actual working conditions, the number of series branches of the plurality of battery cells 40 is generally 2 to 50.

[0086] Optionally, the number of parallel battery cells 40 in each series branch of the battery cell 40 can be 1-12, and optionally, in actual working conditions, the number of parallel battery cells 40 in each series branch of the battery cell 40 is generally 1 to 4.

[0087] In an alternative embodiment, the application further provides an energy storage device.

[0088] In the embodiments provided herein, it should be understood that the disclosed technology can be implemented in other manners. In the embodiments described above, the unit division is only illustrative and each unit can include a plurality of sub-units or a plurality of units can be combined to form a sub-unit, or some features can be omitted or not implemented. In other words, the internal structure of each unit is not limited to the structure described above, and the division of the units is only a logical function division and can not be a mechanical or physical division. In addition, a plurality of units or a plurality of components can be combined or integrated to form a single unit, or some features can be omitted or not implemented. In other words, the division of the units is only a logical function division and can not be a mechanical or physical division.

[0089] The units shown as separate units can or can not be physically separate, and the units shown as units can or can not be physical units. They can be located in one place or distributed on multiple units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiments.

[0090] In any embodiment of the present application, each functional unit can be integrated into a processing unit, each unit can exist physically alone, or two or more units can be integrated into one unit. The integrated unit can be implemented in the form of a hardware functional unit or in the form of a software functional unit.

[0091] All functions of the present application must be connected with representative software, which is not part of the present application. The form and level of detection are defined according to design requirements. Data can be stored in the case of using appropriate storage technology.

[0092] The above description is only an optional implementation of the present application, and it should be pointed out that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should be considered as falling within the scope of protection of the present application.

Claims

1. A battery temperature monitoring circuit, characterized in that, include: Multiple parallel thermistor branches, each thermistor branch including at least one thermistor (10), the at least one thermistor (10) being used to monitor the temperature of the battery; The at least one thermistor (10) is electrically isolated from the bus or the acquisition terminal, and the at least one thermistor (10) is thermally connected to the bus or the acquisition terminal.

2. The battery temperature monitoring circuit according to claim 1, characterized in that, The battery temperature monitoring circuit also includes: The input terminal of the battery temperature monitoring circuit is connected to the first terminal of the resistor (20), the second terminal of the resistor (20) is connected to the first output terminal of the power supply, and the output terminal of the battery temperature monitoring circuit is connected to the second output terminal of the power supply.

3. The battery temperature monitoring circuit according to claim 2, characterized in that, The power source is a voltage source (30).

4. The battery temperature monitoring circuit according to claim 1, characterized in that, The at least one thermistor (10) is attached to the bus or the acquisition terminal, or the at least one thermistor (10) is soldered to the bus or the acquisition terminal.

5. A battery, characterized in that, include: At least one battery temperature monitoring circuit according to any one of claims 1 to 4.

6. The battery according to claim 5, characterized in that, The battery also includes a plurality of cells (40) connected in parallel, and at least one battery temperature monitoring circuit for temperature monitoring is provided on at least one parallel branch of the battery.

7. The battery according to claim 6, characterized in that, The plurality of cells (40) are connected in parallel, and at least one thermistor (10) for temperature monitoring is provided on at least one parallel branch of the battery.

8. The battery according to claim 6, characterized in that, The ratio of the number of the at least one thermistor (10) to the number of the plurality of cells (40) ranges from 10 to 1 / 20.

9. The battery according to claim 8, characterized in that, The ratio ranges from 10 to 1 / 8.

10. The battery according to claim 6, characterized in that, The at least one thermistor (10) is electrically isolated from the battery cell (40), and the at least one thermistor (10) is thermally connected to the battery cell (40).

11. The battery according to claim 10, characterized in that, The at least one thermistor (10) is attached to the battery cell (40).

12. The battery according to claim 6, characterized in that, The plurality of battery cells (40) are first connected in parallel and then in series, wherein the number of series branches of the plurality of battery cells (40) ranges from 2 to 50, and the number of parallel branches of each series branch ranges from 1 to 12.

13. An energy storage device, characterized in that, Includes the battery according to claim 5.

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