Battery pack detection device and method, battery management system and awakening method thereof, battery pack and electric energy equipment

Abstract

The invention provides a battery pack detection device and method, a battery management system and an awakening method thereof, a battery pack and electric energy equipment, and the battery pack detection device can independently detect whether the battery pack breaks down or not, and can be applied to the condition that the battery management system is in a dormant state. The battery management system is timely and reversely awakened under the condition that the battery pack is detected to be abnormal, all-weather real-time detection and protection of the battery pack are realized, various fault detections can be integrated in one device, the structural complexity of the battery pack detection device is effectively reduced, and the detection efficiency is improved. Therefore, the limited space in the battery pack is prevented from being occupied, and the power consumption and the cost of the battery pack are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery pack detection device and method, a battery management system and its wake-up method, a battery pack and an electric energy device. BACKGROUND

[0002] With the continuous development of new energy technology, battery packs are widely used in various cars and various devices. Since the safety of the battery pack is an important factor affecting the promotion and use of new energy technology, the supplier needs to detect in real time whether the battery pack has a cell liquid leakage, thermal runaway and other faults during use. Once a fault occurs, the battery pack needs to be stopped and used, and the battery pack needs to be repaired and replaced in combination with the abnormality to prevent more serious safety problems caused by the fault of the battery pack.

[0003] In the prior art, in the detection device for detecting the fault of the battery pack, a plurality of different chips and sensors need to be arranged. Each chip detects and analyzes one kind of fault of the battery pack based on the signal of one kind of sensor, and sends indication information to the battery management system after determining that a fault occurs, so that the battery management system determines whether the battery pack has a fault according to the received indication information.

[0004] However, the number of chips arranged in the detection device in the prior art is large, and the corresponding circuit structure is complex, which leads to high structural complexity of the battery pack detection device, greatly occupies the internal space of the battery pack and increases the cost. SUMMARY

[0005] The present application provides a battery pack detection device, method, battery management system and its wake-up method, battery pack and electric energy device, which reduces the structural complexity of the battery pack detection device while meeting the requirement of detecting whether the battery pack has a fault.

[0006] The first aspect of the present application provides a battery pack detection device, comprising: a liquid leakage detection module, a thermal runaway detection module and a voltage output module, wherein the liquid leakage detection module and the thermal runaway detection module are connected to the voltage output module; the liquid leakage detection module is configured to detect the gas concentration inside the battery pack and output a voltage signal with a level value positively correlated with the concentration through the voltage output module, wherein the level value of the voltage signal is within a preset value range, and is used to indicate whether the battery pack has a liquid leakage fault; the thermal runaway detection module is configured to detect the gas pressure inside the battery pack and output a voltage signal with a preset level value through the voltage output module in the case that the battery pack has a thermal runaway fault, wherein the preset level value is outside the preset value range.

[0007] The second aspect of the present application provides a battery pack detection method for detecting whether the battery pack fails based on the battery pack detection device of the first aspect, the detection method comprising: acquiring a voltage signal output by the battery pack detection device; and determining whether the battery pack has a liquid leakage failure or a thermal runaway failure according to a level value of the voltage signal.

[0008] The third aspect of the present application provides a battery management system wake-up method for waking up the battery management system based on the battery pack detection device of the first aspect, the wake-up method comprising: acquiring a voltage signal output by the battery pack detection device; and waking up the battery management system according to a level value of the voltage signal.

[0009] The fourth aspect of the present application provides a battery management system, comprising: the detection device of the first aspect for outputting the voltage signal; a power supply chip for controlling the main control chip to be powered on by the wake-up method of the third aspect to wake up the battery management system; and a main control chip for determining whether the battery pack has a liquid leakage failure or a thermal runaway failure after being woken up by the detection method of the second aspect.

[0010] The fifth aspect of the present application provides a battery management system connected to the detection device of the first aspect and configured to be woken up by the wake-up method of the third aspect and to determine whether the battery pack has a liquid leakage failure or a thermal runaway failure after being woken up by the detection method of the second aspect.

[0011] The sixth aspect of the present application provides a battery pack comprising the battery management system of the fourth aspect or the fifth aspect.

[0012] The seventh aspect of the present application provides an electric energy device comprising the battery pack of the sixth aspect.

[0013] The battery pack detection device, method, battery management system and its wake-up method, battery pack, and electric energy device provided by the present application can independently detect whether the battery pack fails, can be applied to the case where the battery management system is in a dormant state, can timely reverse wake up the battery management system in the case where the battery pack has an abnormality, and can realize all-weather real-time detection and protection of the battery pack. Meanwhile, the battery pack detection device can realize detection of multiple failures, including liquid leakage failure and thermal runaway failure, by using one device, can effectively reduce the structural complexity of the battery pack detection device, thereby avoiding occupation of the limited space inside the battery pack, improving the energy density of the battery pack, reducing the power consumption and cost of the battery pack, greatly improving the performance-price ratio of the battery pack detection device, and being more conducive to application and promotion of the battery pack detection device. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor under the premise of the drawings.

[0015] Figure 1 It is a structural schematic diagram of a detection device for detecting a battery pack in the prior art.

[0016] Figure 2 It is a structural schematic diagram of an embodiment of the battery pack detection device provided by the present application.

[0017] Figure 3 It is a circuit structural schematic diagram of an embodiment of the battery pack detection device provided by the present application.

[0018] Figure 4 It is a schematic diagram of the change of the resistance value of the semiconductor VOC resistance sensor provided by the present application.

[0019] Figure 5 It is a schematic diagram of an application structure of the battery pack detection device provided by the present application.

[0020] Figure 6 It is a schematic diagram of another application structure of the battery pack detection device provided by the present application.

[0021] Figure 7 It is a flow schematic diagram of an embodiment of the battery pack detection method provided by the present application.

[0022] Figure 8 It is a flow schematic diagram of another embodiment of the battery pack detection method provided by the present application.

[0023] Figure 9 It is a flow schematic diagram of an embodiment of the wake-up method of the battery management system provided by the present application.

[0024] Figure 10 It is a flow schematic diagram of another embodiment of the wake-up method of the battery management system provided by the present application.

[0025] Figure 11 It is a structural schematic diagram of an electronic device provided by the present application. DETAILED DESCRIPTION

[0026] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present application.

[0027] The terms "first", "second", "third", "fourth" and the like in the description and claims of the present application and the above drawings, if any, are used to distinguish similar objects, and are not necessarily used to describe a particular sequential or chronological order. It should be understood that the data thus used can be interchanged, where appropriate, so that the embodiments of the present application described herein can be carried out in other than the order shown or described herein. Furthermore, the terms "comprise" and "have", and any variations thereof, are intended to cover non-exclusive inclusion, for example, processes, methods, systems, products, or devices that comprise a list of steps or units are not necessarily limited to those clearly listed, but can include other steps or units not clearly listed or inherent to such processes, methods, products, or devices.

[0028] Figure 1 A structural schematic diagram of a detection device for detecting a battery pack in the prior art is shown in Figure 1 The detection device 10 can be arranged inside the battery pack 11 and in communication connection with a battery management system (BMS) 12.

[0029] When the battery management system 12 is in a normal working state, the battery management system 12 can be used to sample the voltage, temperature and insulation of the battery pack 11, etc., so as to determine whether the battery pack 11 has a fault based on the sampling results, and after the fault occurs, timely monitor, handle the fault, and perform protection of the battery pack 11, etc.

[0030] When the battery management system 12 is in a sleep state, the detection device 10 can be used to monitor the battery pack 11 instead of the battery management system 12. When the detection device 10 detects that the battery pack 11 has a fault, the detection device 10 timely wakes up the battery management system 12, so that the battery management system 12 monitors, handles the fault, and performs protection of the battery pack 11, etc.

[0031] More specifically, in Figure 1The detection device 10 shown includes a sensor 101, a multi-stage circuit 102, and a main chip 103. The sensor 101 is configured to detect information such as air pressure and temperature in the battery pack 10, and send the information to the main chip 103 through the multi-stage circuit 102. The main chip 103 is configured to comprehensively determine whether a fault occurs according to a strategy logic of the fault. The main chip 103 communicates with the battery management system 102 through a communication bus or the like. In a case where it is determined that a fault occurs, the main chip 103 is configured to send a detection signal to the battery management system 102.

[0032] For example, in an embodiment, the sensor 101 can be a VOC sensor or the like configured to detect a gas concentration, and is configured to detect whether a liquid leakage fault occurs in the battery pack 11. The liquid leakage fault is caused by liquid leakage of the battery pack 11 due to external force impact, cell swelling and deformation, abuse, poor welding and packaging, internal short circuit, and the like. Specifically, the sensor 101 is configured to detect a gas concentration. The main chip 103 is configured to comprehensively determine whether a liquid leakage fault occurs according to a strategy logic of the fault. In a case where it is determined that a liquid leakage fault occurs, the main chip 103 is configured to send a detection signal to the battery management system 12, so that the battery management system 12 switches to a working state according to the received detection signal, and determines that the battery pack 11 has a liquid leakage abnormality.

[0033] For another example, in another embodiment, the sensor 101 can be an air pressure sensor or the like, and is configured to detect whether a thermal runaway fault occurs in the battery pack 11. The thermal runaway fault is caused by over-temperature, over-charging, internal short circuit, and the like. Specifically, the sensor 101 is configured to detect a temperature. The main chip 103 is configured to comprehensively determine whether a thermal runaway fault occurs according to a strategy logic of the fault. In a case where it is determined that a thermal runaway fault occurs, the main chip 103 is configured to send a detection signal to the battery management system 12, so that the battery management system 12 switches to a working state according to the received detection signal, and determines that the battery pack 11 has a thermal runaway fault.

[0034] As can be seen, in the above embodiments, in order to determine different faults occurring in the battery pack 11, a corresponding detection device 10 needs to be set for each fault, for example, one detection device 10 is set for detecting a liquid leakage abnormality, and another detection device 10 is set for detecting a thermal runaway fault. Since each detection device 10 can only be used to detect one fault, the sensor 101, the main chip 103, and the corresponding multi-stage circuit 102 also need to be set in each detection device 10.

[0035] Therefore, when the battery pack 11 needs to be detected more failures, it is necessary to set more types and more quantities of detection devices 10, and the detection devices 10 and the main chip 103, the multi-stage circuit 102 and the like arranged therein will greatly occupy the limited space inside the battery pack 11, reduce the overall volume energy density of the battery pack 11, and increase the power consumption and cost of the battery pack 11.

[0036] At the same time, the detection device 10 in the above embodiment can only analyze one kind of failure of the battery pack 11 alone, and the battery management system 12 can only determine whether the battery pack 11 has occurred the failure according to the received detection signal. The method of determining whether the battery pack 11 has occurred the failure has a low degree of intelligence, which is not conducive to the promotion and application of the detection device.

[0037] Therefore, the present application provides a battery pack detection device and a corresponding detection method, which can detect multiple failures of the battery pack 11 while reducing the types and quantities of the detection devices and the main chip 103 and the multi-stage circuit 102 arranged therein for detecting the failures of the battery pack 11. The technical solutions of the present application will be described in detail in the embodiments below. The embodiments below can be combined with each other, and the same or similar concepts or processes may not be described in some embodiments.

[0038] Figure 2 The structural schematic diagram of an embodiment of the battery pack detection device provided by the present application is shown in FIG. 1. Figure 2 As shown in FIG. 1, the battery pack detection device 20 includes a liquid leakage detection module 201, a thermal runaway detection module 202, and a voltage output module 203. The liquid leakage detection module 201 is connected to the voltage output module 203, and the thermal runaway detection module 202 is connected to the voltage output module 203. The liquid leakage detection module 201 and the thermal runaway detection module 202 can be used to output voltage signals through the voltage output module 203, respectively.

[0039] The liquid leakage detection module 201 is used to detect the gas concentration inside the battery pack 11 and output a voltage signal through the voltage output module 203. The level value of the voltage signal output by the liquid leakage detection module 201 through the voltage output module 203 is positively correlated with the gas concentration inside the battery pack 11, and the level value of the voltage signal is within a preset range. At this time, the voltage signal output by the liquid leakage detection module 201 through the voltage output module 203 is used to indicate whether the battery pack 11 has a liquid leakage failure.

[0040] The thermal runaway detection module 202 is configured to detect the air pressure inside the battery pack 11, and output a voltage signal through the voltage output module 203 in the case that the battery pack 11 has a thermal runaway fault. The voltage signal output by the liquid leakage detection module 201 through the voltage output module 203 is a preset level value, and the preset level value is outside the preset range. At this time, the voltage signal output by the thermal runaway detection module 202 through the voltage output module 203 is used to indicate that the battery pack 11 has a thermal runaway fault.

[0041] In an embodiment, the battery management system 12 can be configured to receive the voltage signal output by the battery pack detection device 20, and perform processes such as waking up based on the voltage signal and determining the fault of the battery pack 11. Details are described in subsequent embodiments of the present application.

[0042] As can be seen, the battery pack detection device 20 provided by the embodiments of the present application can independently detect whether the battery pack 11 has a fault. The battery pack detection device 20 can be applied to the case that the battery management system 12 is in a sleep state, and can replace the battery management system 12 to perform detection. In addition, the battery pack detection device 20 can timely wake up the battery management system 12 in the case that the battery pack 11 has an abnormality, and realizes all-weather real-time detection and protection of the battery pack 11. At the same time, the battery pack detection device 20 provided by the embodiments of the present application realizes detection of multiple faults, including liquid leakage faults and thermal runaway faults, through the same device. The multiple fault detection is integrated in one device, which can avoid Figure 1 the case that one detection device 10 is provided for each fault in the prior art, effectively reduces the structural complexity of the battery pack detection device 20, thereby avoiding occupation of the limited space inside the battery pack 11, improving the energy density of the battery pack 11, and reducing the power consumption and cost of the battery pack 11. The cost performance of the battery pack detection device 20 is greatly improved, and the application and promotion of the battery pack detection device 20 are more beneficial.

[0043] In a specific implementation manner, the liquid leakage detection module 201 and the thermal runaway detection module 202 of the battery pack detection device 20 provided by the present application specifically output the voltage signal through voltage division with the voltage output module 203. The implementation manner and the circuit structure are relatively simple and effective, which can improve the accuracy and real-time performance of detection on the basis of reducing detection cost.

[0044] For example, Figure 3 The circuit structure schematic diagram of an embodiment of the battery pack detection device provided by the present application is shown in FIG. 1. Figure 3 The specific circuit implementation manner of the battery pack detection device provided by the present application is shown in FIG. 2. Figure 2 The specific circuit implementation manner of the battery pack detection device provided by the present application is shown in FIG. 2. Figure 3As shown, the liquid leakage detection module 201 and the thermal runaway detection module 202 are both connected to a voltage source, and both the liquid leakage detection module 201 and the thermal runaway detection module 202 are grounded via a low-voltage ground of the voltage output module 203 .

[0045] When the voltage output module is in the first state, the voltage source provides a supply voltage to the leakage detection module 201 , and the leakage detection module 201 outputs a voltage signal U based on the voltage division of the supply voltage between the voltage output module 203 and the voltage source.

[0046] When the voltage output module is in the second state, the voltage source provides a supply voltage to the thermal runaway detection module 202 , and the thermal runaway detection module 202 outputs a voltage signal U based on the voltage division of the supply voltage between the voltage output module 203 .

[0047] In one embodiment, the thermal runaway detection module is further configured to control the voltage output module 203 to switch from the first state to the second state upon detecting a thermal runaway fault in the battery pack 11. It is understood that if the thermal runaway detection module does not detect a thermal runaway fault in the battery pack 11, the voltage output module 203 is in the first state.

[0048] like Figure 3 The voltage output module 203 shown includes a switch unit K, a first voltage divider unit R1, and a voltage stabilizing unit C. The control terminal c of the switch unit K is connected to the liquid leakage detection module 201, the second terminal b of the switch unit K is connected to the first terminal of the first voltage divider unit R1 and the first terminal of the voltage stabilizing unit C, and the second terminal of the first voltage divider unit R1 and the second terminal of the voltage stabilizing unit C are connected to a low-voltage ground and thus grounded. The first terminal of the first voltage divider unit R1 can be used to output a voltage signal U.

[0049] In one embodiment, the switch unit includes a Metal Oxide Semiconductor Field Effect Transistor (MOS) switch. Figure 3 In the example shown, the switch unit is specifically an NMOS switch.

[0050] In one embodiment, the first voltage divider unit R1 may specifically include one or more resistors. The voltage stabilizing unit C may be a capacitor, configured to filter the voltage across the first voltage divider unit R1 to prevent voltage fluctuations caused by glitches in the voltage signal U output by the voltage output module 203, thereby preventing subsequent erroneous processing of the voltage signal U.

[0051] like Figure 3The shown liquid leakage detection module 201 includes: a semiconductor type volatile organic compound (VOC) resistance sensor and a second voltage dividing unit R2, the first end of the semiconductor type VOC resistance sensor is connected to a voltage source, the second end of the semiconductor type VOC resistance sensor is connected to the first end of the second voltage dividing unit R2, and the second end of the second voltage dividing unit R2 is connected to the first end a of the switch unit K. The second voltage dividing unit R2 can specifically include one or more resistors.

[0052] In an embodiment, the semiconductor type VOC resistance sensor is arranged inside the battery pack 11, which can be used to detect the gas concentration inside the battery pack, and the resistance value of the semiconductor type VOC resistance sensor changes with the gas concentration.

[0053] For example, Figure 4 The change diagram of the resistance value of the semiconductor type VOC resistance sensor provided in the present application is as shown in Figure 4 As can be seen, the resistance value of the semiconductor type VOC resistance sensor is negatively related to the gas concentration, and the higher the gas concentration inside the battery pack 11, the smaller the resistance value.

[0054] In combination with the voltage dividing between the semiconductor type VOC resistance sensor, the second voltage dividing unit R2 and the first voltage dividing unit R1 to the power supply voltage provided by the voltage source, the higher the gas concentration inside the battery pack 11, the smaller the resistance value of the semiconductor type VOC resistance sensor, and the larger the level value of the voltage signal U output by the first end of the first voltage dividing unit R1 in the voltage output module 203; the lower the gas concentration inside the battery pack 11, the larger the resistance value of the semiconductor type VOC resistance sensor, and the smaller the level value of the voltage signal U output by the first end of the first voltage dividing unit R1 in the voltage output module 203, therefore, the level value of the voltage signal U can be used to indicate the gas concentration inside the battery pack 11, and based on the voltage dividing of the semiconductor type VOC resistance sensor, the second voltage dividing unit R2 and the first voltage dividing unit R1, at this time the level value of the voltage signal U changes within a preset range.

[0055] As Figure 3 The shown thermal runaway detection module 202 includes: an air pressure switch and a third voltage dividing unit R3, wherein the first end of the third voltage dividing unit R3 is connected to a voltage source, the second end of the third voltage dividing unit R3 is connected to the first end of the air pressure switch and the control end c of the switch unit K, and the second end of the air pressure switch is connected to the second end b of the switch unit K in the voltage output module 203, the first end of the first voltage dividing unit R1 and the first end of the voltage stabilizing unit C. The third voltage dividing unit R3 can specifically include one or more resistors.

[0056] In one embodiment, the air pressure switch is disposed inside the battery pack 11 and can be used to detect the temperature inside the battery pack 11. The initial state of the air pressure switch is off, providing a low level to the control terminal c of the switch unit K to control the conduction of the first terminal a and the second terminal b of the switch unit K. When the air pressure switch detects that the temperature inside the battery pack 11 is greater than the thermal runaway threshold, in the case of a thermal runaway failure of the battery pack 11 at this time, the air pressure switch switches from the off state to the on state, providing a high level to the control terminal c of the switch unit K to control the disconnection of the first terminal a and the second terminal b of the switch unit K. At this time, based on the voltage division of the third voltage division unit R3 and the first voltage division unit R1, the voltage signal U with a preset level value output from the first terminal of the first voltage division unit R1 in the voltage output module 203, and the preset level value is specifically the voltage division value of the supply voltage between the third voltage division unit R3 and the first voltage division unit R1.

[0057] In order to enable the level value of the output voltage signal U to correspond to different faults, the resistance values of the first voltage division unit R1, the second voltage division unit R2, and the third voltage division unit R3 can also be selected accordingly. For example, denote the level value of the voltage signal U output by the battery pack detection device 20 as V1, denote the wake-up level threshold value of the battery management system 12 as V2, and denote the resistance value of the semiconductor type VOC resistance sensor as R'. Then the selection rules for the first voltage division unit R1, the second voltage division unit R2, and the third voltage division unit R3 at least include:

[0058] 1. V1 = 12*R1 / (R1 + R2 + R') < V2, that is, in the case of no leakage fault and thermal runaway fault, the level value V1 of the voltage signal U output by the voltage division on both sides of the first voltage division unit R1 is less than the wake-up level value V2 of the battery management system 12.

[0059] 2. V1 = 12*R1 / (R1 + R2 + F1*R') < V2, that is, in the case of a slight leakage fault, the level value V1 of the voltage signal U output by the voltage division on both sides of the first voltage division unit R1 is still less than the wake-up level value V2 of the battery management system 12, where F1 is the reduction coefficient of the semiconductor type VOC resistance sensor, and the value range is 0 - 1.

[0060] 3. V1 = 12*R1 / (R1 + R2 + F2*R') > V2, that is, in the case of a serious leakage fault, the level value V1 of the voltage signal U output by the voltage division on both sides of the first voltage division unit R1 is greater than the wake-up level value V2 of the battery management system 12, where F2 is the reduction coefficient of the semiconductor type VOC resistance sensor, and the value range is 0 - 1, and F2 > F1.

[0061] 4. V1 = 12 * R1 / (R1 + R3) > V2. That is, in the case of a thermal runaway fault, the level value V1 of the voltage signal U output by the voltage division on both sides of the first voltage division unit R1 is greater than the wake-up level value V2 of the battery management system 12.

[0062] 5. R3 < R2. Here, to distinguish from the preset voltage division where the level value of the voltage signal U output by the liquid leakage detection module 201 is located, the preset level value of the voltage signal U output by the thermal runaway detection module 202 can be set outside the preset range. For example, in one embodiment, the resistance value of the third voltage division unit R3 is less than the resistance value of the second voltage division unit R2. At this time, the preset level value is greater than the maximum level value in the preset range.

[0063] It can be seen that, as Figure 3 shown in the battery pack detection device 20, without setting a chip, voltage signals are output through voltage division to indicate the liquid leakage fault and thermal runaway fault that occur, making the battery pack detection device 20 provided in this embodiment have the characteristics of simple structure, strong reliability, high cost performance, and low power consumption.

[0064] Figure 5 FIG. is a schematic diagram of an application structure of the battery pack detection device provided by the present application. As Figure 5 shown, the battery pack detection device 20 can be a device set independently of the battery management system 12. This setting method can be called "independent type". Among them, both the battery pack detection device 20 and the battery management system 12 are connected to a voltage source, and the voltage source can supply power to the battery pack detection device 20 and the battery management system 12 simultaneously. In one embodiment, the voltage source can be a 12V constant power supply. Also, both the battery pack detection device 20 and the battery management system 12 are connected to a low-voltage ground. The interface for the battery pack detection device 20 to output the voltage signal U is respectively connected to the wake-up interface and the voltage sampling interface of the battery management system 12. In one embodiment, the battery pack detection device 20 and the battery management system 12 are connected by a hard wire.

[0065] Figure 6 FIG. is a schematic diagram of another application structure of the battery pack detection device provided by the present application. As Figure 6The battery pack detection device 20 shown can be set in the battery management system 12, specifically, it can be mounted on the hardware circuit of the battery management system 12. This configuration can be called "onboard". The battery pack detection device 20 and the power chip are both connected to a voltage source. The voltage source can simultaneously supply power to the battery pack detection device 20 and to the main control chip through the power chip. The main control chip and the battery pack detection device 20 are both connected to the reference ground. In addition, the interface for the battery pack detection device 20 to output the voltage signal U is connected to the power chip and the main control chip respectively. In one embodiment, the battery pack detection device 20 is connected to the power chip and the main control chip respectively via hard wires.

[0066] The present application also provides a battery pack, including Figure 5 The battery pack detection device shown, or including Figure 6 The present application also provides an electric energy device, comprising the above-mentioned battery pack, wherein the electric energy device can be specifically an electric vehicle.

[0067] Furthermore, based on the battery pack detection device 20 provided in the aforementioned embodiment of the present application, the present application also provides a battery pack detection method, which can detect the battery pack 11 based on the battery pack detection device 20 to detect whether the battery pack 11 has a fault.

[0068] Figure 7 This is a flow chart of an embodiment of the battery pack detection method provided by this application, as shown in FIG. Figure 7 The battery pack detection method shown can be applied to Figure 5 In the scenario shown, and specifically executed by the battery management system 12, or as Figure 7 The battery pack detection method shown can be applied to Figure 6 In the described scenario, it is specifically executed by the main control chip in the battery management system 12.

[0069] Specifically, if Figure 7 The battery pack detection method shown includes:

[0070] S101 : Acquire a voltage signal output by the battery pack detection device 20 .

[0071] S102: Determine whether the battery pack has a fault based on the level value of the voltage signal obtained in S101, specifically determining whether the battery pack 11 has a leakage fault or a thermal runaway fault.

[0072] In one embodiment, in the above S102 , it can be determined whether the battery pack 11 has a fault based on the comparison results of the level value of the voltage signal with the first preset value, the second preset value, and the third preset value.

[0073] For example, Figure 8A flowchart of another embodiment of the battery pack detection method provided in the present application is shown, which shows the fault detection strategy in S102:

[0074] When the level value of the voltage signal U output by the battery pack detection device 20 is less than or equal to the first preset value, it is determined that the battery pack 11 does not have a liquid leakage fault and a thermal runaway fault.

[0075] When the level value of the voltage signal U output by the battery pack detection device 20 is greater than the first preset value and less than or equal to the second preset value, it is determined that the battery pack 11 has a slight liquid leakage fault.

[0076] When the level value of the voltage signal U output by the battery pack detection device 20 is greater than the second preset value and less than or equal to the third preset value, it is determined that the battery pack 11 has a serious liquid leakage fault.

[0077] When the level value of the voltage signal U output by the battery pack detection device 20 is greater than the third preset value, it is determined that the battery pack 11 has a thermal runaway fault.

[0078] As can be seen from the above, based on the voltage signal U output by the battery pack detection device provided in the present application, the battery management system 12 or the master control chip can determine whether the battery pack 11 has a fault based on the level value of the voltage signal U, and determine whether the fault is a liquid leakage fault or a thermal runaway fault. The judgment logic is simpler and more effective, and has strong effectiveness and accuracy.

[0079] Further, based on the battery pack detection device 20 provided in the foregoing embodiments of the present application, the present application further provides a battery management system wake-up method, which can wake up the battery management system based on the battery pack detection device 20.

[0080] Figure 9 A flowchart of an embodiment of the battery management system wake-up method provided in the present application is shown, as shown in Figure 9 The battery pack detection method can be applied to the scenario shown in Figure 5 and is specifically executed by the battery management system 12, or the battery pack detection method shown in Figure 9 The battery pack detection method can be applied to the scenario shown in Figure 6 and is specifically executed by the power supply chip in the battery management system 12.

[0081] Specifically, the battery pack detection method shown in Figure 9 includes:

[0082] S201: Obtain the voltage signal output by the battery pack detection device 20.

[0083] S202: wake up the battery management system 12 according to the level value of the voltage signal obtained in S101.

[0084] In an embodiment, after the battery management system 12 or the master control chip is woken up, the method shown in FIG. 2 can be used to determine the fault existing in the battery pack 11, and handle the fault and / or provide protection for the battery pack 11 according to the fault existing in the battery pack 11. Figure 7

[0085] In an embodiment, the determination of whether to wake up the battery management system 12 in S202 can be based on the comparison result of the level value of the voltage signal and the first preset value, the second preset value and the third preset value.

[0086] For example, Figure 10 The flowchart of another embodiment of the wake-up method of the battery management system provided in the present application is shown in FIG. 2, which shows the wake-up strategy in S202.

[0087] When the level value of the voltage signal U output by the battery pack detection device 20 is less than or equal to the first preset value, and when the level value of the voltage signal U output by the battery pack detection device 20 is greater than the first preset value and less than or equal to the second preset value, it is determined that the battery management system 12 is not woken up.

[0088] When the level value of the voltage signal U output by the battery pack detection device 20 is greater than the second preset value and less than or equal to the third preset value, and when the level value of the voltage signal U output by the battery pack detection device 20 is greater than the third preset value, it is determined that the battery management system 12 is woken up. For example, the power supply chip powers on the master control chip, and the master control chip is started after being powered on, and is switched from the sleep state to the working state, thereby realizing the wake-up of the master control chip in the battery management system 12.

[0089] As can be seen from the above, based on the voltage signal U output by the battery pack detection device provided in the present application, the battery management system 12 or the power supply chip can wake up the battery management system 12 based on the level value of the voltage signal U, and the judgment logic is simpler and more effective, and has strong effectiveness and accuracy.

[0090] ​In the foregoing embodiments of the present application, the battery pack detection method and the wake-up method of the battery management system provided by the embodiments of the present application are introduced. In order to implement the functions in the methods provided by the embodiments of the present application, the battery management system, the master control chip and the power supply chip as the execution subject can be implemented by a hardware structure and / or a software module, for example, the foregoing functions are implemented in the form of a hardware structure, a software module or a hardware structure plus a software module. Whether a certain function in the foregoing functions is implemented in the form of a hardware structure, a software module or a hardware structure plus a software module depends on the specific application of the technical solution and the design constraint conditions.

[0091] It should be understood that the division of each module of the foregoing apparatus is only a logical function division, and all or part of the modules can be integrated into one physical entity or physically separated when actually implemented. The modules can all be implemented in the form of software invoked by a processing element; all be implemented in the form of hardware; or part of the modules are implemented in the form of software invoked by a processing element and part of the modules are implemented in the form of hardware. For example, the processing module can be a separately established processing element or can be integrated in a chip of the foregoing apparatus, and in addition, the processing module can be in the form of program code stored in a memory of the foregoing apparatus and invoked and executed by a processing element of the foregoing apparatus to implement the functions of the foregoing determination module. The implementation of other modules is similar. In addition, all or part of the modules can be integrated together or independently implemented. The processing element described herein can be an integrated circuit having a signal processing capability. In the implementation process, each step of the foregoing method or the foregoing modules can be completed by an integrated logic circuit of hardware in the processing element or an instruction in the form of software.

[0092] For example, the foregoing modules can be one or more integrated circuits configured to implement the foregoing method, for example, one or more application specific integrated circuits (ASICs), or one or more digital signal processors (DSPs), or one or more field programmable gate arrays (FPGAs), etc. For another example, when a certain module is implemented in the form of program code invoked by a processing element, the processing element can be a general-purpose processor such as a central processing unit (CPU) or other processor that can invoke program code. For another example, the modules can be integrated together to implement in the form of a system on a chip (SOC). In the foregoing embodiments, all or part of the foregoing embodiments can be implemented by software, hardware, firmware or any combination thereof.

[0093] For example, Figure 11 A structural schematic diagram of an electronic device provided in the present application is shown in FIG. 1. As shown in FIG. 1, the device can be used to execute the battery pack detection method provided in any embodiment of the present application. Alternatively, the device shown in FIG. 2 can be used to execute the wakeup method of the battery management system provided in any embodiment of the present application. Figure 11 A structural schematic diagram of an electronic device provided in the present application is shown in FIG. 1. As shown in FIG. 1, the device can be used to execute the battery pack detection method provided in any embodiment of the present application. Alternatively, the device shown in FIG. 2 can be used to execute the wakeup method of the battery management system provided in any embodiment of the present application. Figure 11 A structural schematic diagram of an electronic device provided in the present application is shown in FIG. 1. As shown in FIG. 1, the device can be used to execute the battery pack detection method provided in any embodiment of the present application. Alternatively, the device shown in FIG. 2 can be used to execute the wakeup method of the battery management system provided in any embodiment of the present application.

[0094] In an embodiment, the electronic device 1000 shown in FIG. 1 includes one or more processors 1001 and a memory 1002. The memory 1002 is configured to store computer-executable instructions, and the processor 1001 can execute the computer-executable instructions stored in the memory 1002. When the computer-executable instructions are executed by the processor 1001, the processor 1001 implements the battery pack detection method or the wakeup method of the battery management system as described in any of the preceding embodiments of the present application. Figure 11 In an embodiment, the electronic device 1000 shown in FIG. 1 further includes a communication interface 1003, wherein the processor 1001 can communicate with other devices through the communication interface 1003, for example, the processor 1001 acquires a voltage signal through the communication interface 1003, etc.

[0095] Figure 11 In the above-mentioned embodiments, it should be understood that the processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), etc. The general-purpose processor can be a microprocessor or any conventional processor, etc. The steps of the method disclosed in combination with the present application can be directly embodied as execution completed by a hardware processor, or executed by a combination of hardware and software modules in the processor.

[0096] The memory can include a random access memory (RAM), and can also include a non-volatile memory (NVM), such as at least one disk memory.

[0097] The memory can include a random access memory (RAM), and can also include a non-volatile memory (NVM), such as at least one disk memory.

[0098] ​The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the bus in the drawings of the present application does not limit to only one bus or one type of bus.

[0099] The embodiment of the present application further provides a chip for executing instructions, which is used for executing the battery pack detection method or the wake-up method of the battery management system according to any one of the foregoing embodiments of the present application.

[0100] The embodiment of the present application further provides a computer program product, comprising a computer program, which is executed to implement the battery pack detection method or the wake-up method of the battery management system according to any one of the foregoing embodiments of the present application.

[0101] The present application further provides a computer readable storage medium, which stores computer executable instructions, and the computer executable instructions are executed to implement the battery pack detection method or the wake-up method of the battery management system according to any one of the foregoing embodiments of the present application.

[0102] The readable storage medium described above can be implemented by any type of volatile or nonvolatile storage devices or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general or special purpose computer.

[0103] An exemplary readable storage medium is coupled to the processor, so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be an integral part of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium can also exist as discrete components in the device.

[0104] The division of units is only a logical functional division, and actual implementation can have another division manner, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0105] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or they can be distributed on multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0106] In addition, the functional units in each embodiment of the application can be integrated into a processing unit, or each unit can be physically present alone, or two or more units can be integrated into one unit.

[0107] Those skilled in the art can understand that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware. The foregoing program can be stored in a computer readable storage medium. The program executes the steps including the above-mentioned method embodiments when executed; and the foregoing storage medium includes ROM, RAM, magnetic disc or optical disc and various storage medium that can store program codes.

[0108] Finally, it should be noted that those skilled in the art, after considering the specification and practicing the disclosed application, will easily think of other embodiments of the application. The application is intended to cover any variations, uses or adaptations of the application that follow the general principles of the application and include known or customary technical means in the art that are not disclosed in the application, and is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the application is only limited by the appended claims.

Claims

1. A battery pack detection apparatus characterized by comprising: The device comprises a liquid leakage detection module, a thermal runaway detection module, and a voltage output module, wherein the liquid leakage detection module and the thermal runaway detection module are connected to the voltage output module. The liquid leakage detection module is configured to detect the gas concentration inside the battery pack and output a voltage signal with a level value positively correlated to the concentration via the voltage output module, wherein the level value of the voltage signal is within a preset value range and is used to indicate whether the battery pack has a liquid leakage fault. The thermal runaway detection module is configured to detect the air pressure inside the battery pack and output a voltage signal with a preset level value via the voltage output module when the battery pack has a thermal runaway fault, wherein the preset level value is outside the preset value range.

2. The device of claim 1, wherein the liquid leakage detection module and the thermal runaway detection module are connected to a voltage source, and the liquid leakage detection module and the thermal runaway detection module are grounded via the voltage output module, and the voltage source provides a supply voltage to the liquid leakage detection module and the thermal runaway detection module; when the voltage output module is in a first state, the liquid leakage detection module outputs the voltage signal based on voltage division of the supply voltage between the liquid leakage detection module and the voltage output module; when the voltage output module is in a second state, the thermal runaway detection module outputs the voltage signal based on voltage division of the supply voltage between the thermal runaway detection module and the voltage output module.

3. The device of claim 2, wherein the thermal runaway detection module is further configured to control the voltage output module to switch from the first state to the second state when the battery pack has a thermal runaway fault. The voltage output module comprises a switch unit, a first voltage division unit, and a voltage stabilizing unit. The first end of the switch unit is connected to the liquid leakage detection module, the control end of the switch unit is connected to the thermal runaway detection module, the second end of the switch unit is connected to the first end of the first voltage division unit and the first end of the voltage stabilizing unit, and the second end of the first voltage division unit and the second end of the voltage stabilizing unit are grounded. The liquid leakage detection module comprises a semiconductor VOC resistance sensor and a second voltage division unit.

4. The device according to any of claims 1-3, characterized in that The semiconductor VOC resistance sensor is arranged inside the battery pack and has a resistance value negatively correlated to the gas concentration, the first end of the semiconductor VOC resistance sensor is connected to the voltage source, and the second end of the semiconductor VOC resistance sensor is connected to the first end of the switch unit via the second voltage division unit. The thermal runaway detection module comprises an air pressure switch and a third voltage division unit. The air pressure switch is arranged inside the battery pack and is in a closed state when a thermal runaway fault occurs and in an open state when no thermal runaway fault occurs, the first end of the third voltage division unit is connected to the voltage source, the second end of the third voltage division unit is connected to the first end of the air pressure switch and the control end of the switch unit, respectively, and the second end of the air pressure switch is connected to the voltage output module.

5. The apparatus of claim 4, wherein, ​ ​ ​ 6. The apparatus of claim 5, wherein, ​ ​ ​ 7. The apparatus of claim 6, wherein, a resistance value of the third voltage dividing unit is less than a resistance value of the second voltage dividing unit.

8. The apparatus of any one of claims 4-7, wherein, the switch unit comprises a MOS switch. 9.A battery pack detection method, characterized by, A detection method for detecting whether a battery pack is faulty based on the battery pack detection apparatus of any one of claims 1-8, the detection method comprising: obtaining a voltage signal output by the battery pack detection apparatus; determining, according to a level value of the voltage signal, whether the battery pack is faulty in terms of liquid leakage or thermal runaway.

10. The method of claim 9, wherein, The determining, according to the level value of the voltage signal, whether the battery pack is faulty in terms of liquid leakage or thermal runaway, comprises: in a case where the level value of the voltage signal is less than or equal to a first preset value, determining that the battery pack is not faulty in terms of liquid leakage or thermal runaway; in a case where the level value of the voltage signal is greater than the first preset value and less than or equal to a second preset value, determining that the battery pack is slightly faulty in terms of liquid leakage; in a case where the level value of the voltage signal is greater than the second preset value and less than or equal to a third preset value, determining that the battery pack is seriously faulty in terms of liquid leakage; in a case where the level value of the voltage signal is greater than the third preset value, determining that the battery pack is faulty in terms of thermal runaway, wherein the preset level value is greater than the third preset value.

11. A method of waking up a battery management system, the method comprising: A wake-up method for waking up a battery management system based on the battery pack detection apparatus of any one of claims 1-8, the wake-up method comprising: obtaining a voltage signal output by the battery pack detection apparatus; waking up the battery management system according to a level value of the voltage signal.

12. The method of claim 11, wherein, The waking up the battery management system according to the level value of the voltage signal, comprises: in a case where the level value of the voltage signal is greater than a second preset value and less than or equal to a third preset value, and in a case where the level value of the voltage signal is greater than the third preset value, waking up the battery management system, wherein the preset level value is greater than the third preset value.

13. A battery management system, characterized by, comprises: the detection apparatus of any one of claims 1-8, configured to output the voltage signal; a power supply chip, configured to control power-on of the master control chip by the wake-up method of any one of claims 11-12, so as to wake up the battery management system; a master control chip, configured to, after being woken up, determine whether the battery pack is faulty in terms of liquid leakage or thermal runaway by the detection method of any one of claims 9-10.

14. The battery management system of claim 13, wherein, the detection apparatus is connected to the power supply chip and the master control chip by a hard wire.

15. The battery management system of claim 13 or 14, wherein, the master control chip is further configured to handle the fault and / or provide protection for the battery pack according to the fault of the battery pack.

16. A battery management system, characterized by, connecting the detection apparatus of any one of claims 1-8 is configured to: waking up by the waking up method as claimed in any one of claims 11-12, and, after being woken up, determining whether the battery pack has a liquid leakage fault or a thermal runaway fault by the detecting method as claimed in any one of claims 9-10. 17.The battery management system of claim 16, wherein, the detecting device is connected to the battery management system by a hardwire.

18. The battery management system of claim 16 or 17, wherein, is further configured to: handle the fault and / or provide protection for the battery pack according to the fault occurred by the battery pack.

19. A battery pack, characterized by comprises the battery management system as claimed in any one of claims 13-18.

20. An electrical energy device, characterized by comprises the battery pack as claimed in claim 19.

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