Control circuit board of energy storage equipment, energy storage equipment and energy storage system

Abstract

The invention provides a control circuit board of energy storage equipment, the energy storage equipment and an energy storage system. The control circuit board of the energy storage device comprises a circuit board body; the switch assembly is arranged on the circuit board body, is connected in series between the positive electrode of the battery pack and the positive electrode output end and is used for controlling charging and discharging of the battery pack; the analog front-end chip is arranged on the circuit board body, and the output end of the analog front-end chip is connected with the control end of the switch assembly; the temperature measuring assembly is arranged on the circuit board body and is used for measuring the temperature information of the switch assembly and the temperature information of the circuit board body; and the micro-control unit is arranged on the circuit board body, is connected with the analog front-end chip, and is used for carrying out fault diagnosis on the switch assembly according to the temperature information of the switch assembly and the temperature information of the circuit board body. In the process, a fault point in the switch assembly can be accurately positioned, and convenience is provided for later maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage devices, and in particular to a control circuit board of an energy storage device, an energy storage device and an energy storage system. Background Art

[0002] In related technologies, such as Figure 1 As shown, the energy storage device 200' includes a battery pack 202' and a control circuit board of the energy storage device, wherein the control circuit board of the energy storage device includes a circuit board body 102', a switch assembly 104', an analog front-end chip 106', a micro control unit 108', a fuse FUSE', a shunt SHUNT', a power supply module 110' and a pre-charging circuit 112'.

[0003] Among them, the switch component 104' includes four charging switch tubes and four discharging switch tubes. The four charging switch tubes are a first charging switch tube NMOS1', a second charging switch tube NMOS2', a third charging switch tube NMOS3', and a fourth charging switch tube NMOS4'; the four discharging switch tubes are a first discharging switch tube NMOS5', a second discharging switch tube NMOS6', a third discharging switch tube NMOS7', and a fourth discharging switch tube NMOS8'.

[0004] Specifically, after the first charging switch tube NMOS1', the second charging switch tube NMOS2', the third charging switch tube NMOS3', and the fourth charging switch tube NMOS4' are connected in parallel, they are connected in series with the parallel first discharge switch tube NMOS5', the second discharge switch tube NMOS6', the third discharge switch tube NMOS7', and the fourth discharge switch tube NMOS8', and are connected in series between the positive electrode of the battery pack 202' and the positive electrode output terminal Pack+. The analog front-end chip 106' synchronously drives the G poles of the first charging switch tube NMOS1', the second charging switch tube NMOS2', the third charging switch tube NMOS3', and the fourth charging switch tube NMOS4' through one CHG driving channel, thereby controlling the closing and opening of the D pole to the S pole of the first charging switch tube NMOS1', the second charging switch tube NMOS2', the third charging switch tube NMOS3', and the fourth charging switch tube NMOS4'. The analog front-end chip 106' synchronously drives the control electrode G of the first discharge switch tube NMOS5', the second discharge switch tube NMOS6', the third discharge switch tube NMOS7', and the fourth discharge switch tube NMOS8' through a DSG drive channel, thereby controlling the closing and opening of the D electrode to the S electrode of the first discharge switch tube NMOS5', the second discharge switch tube NMOS6', the third discharge switch tube NMOS7', and the fourth discharge switch tube NMOS8'. The analog front-end chip 106' collects the voltage across the shunt SHUNT' through two channels and then collects the main loop current. One end of the shunt SHUNT' is connected to the negative output terminal Pack-.

[0005] In the above technical solution, the detection of open circuit and short circuit can be realized according to the main circuit current of the four charging switch tubes and the four discharging switch tubes in different states, but the above detection method cannot accurately locate the fault point, which brings inconvenience to after-sales maintenance. Summary of the invention

[0006] The present invention aims to at least solve the technical problem that exists in the prior art or related technology that open circuit and short circuit detection can be achieved according to the main circuit current of four charging switch tubes and four discharging switch tubes in different states, but the above detection method cannot accurately locate the fault point, which brings inconvenience to after-sales maintenance.

[0007] To this end, a first aspect of the present invention is to provide a control circuit board for an energy storage device.

[0008] A second aspect of the present invention provides an energy storage device.

[0009] A third aspect of the present invention is to provide an energy storage system.

[0010] In view of this, according to a first aspect of the present invention, the present invention provides a control circuit board of an energy storage device, the energy storage device includes a battery pack, and the control circuit board of the energy storage device includes: a circuit board body; a switch assembly, arranged on the circuit board body, connected in series between the positive electrode and the positive output end of the battery pack, and used to control the charging and discharging of the battery pack; an analog front-end chip, arranged on the circuit board body, and the output end of the analog front-end chip is connected to the control end of the switch assembly; a temperature measuring assembly, arranged on the circuit board body, and used to measure the temperature information of the switch assembly and the temperature information of the circuit board body; a microcontroller unit, arranged on the circuit board body, connected to the analog front-end chip, and used to perform fault diagnosis on the switch assembly according to the temperature information of the switch assembly and the temperature information of the circuit board body.

[0011] In the technical solution of the present invention, a control circuit board of an energy storage device is proposed, and the control circuit board of the energy storage device includes a circuit board body, a switch assembly, an analog front-end chip, a temperature measurement assembly and a microcontroller unit. Among them, the temperature measurement assembly is arranged on the circuit board body, and is used to measure the temperature information of the switch assembly and the temperature information of the circuit board body. In this process, the state of the switch assembly is diagnosed by detecting the temperature information of the switch assembly and combining the temperature information of the switch assembly with the temperature information of the circuit board body. In this process, the fault point in the switch assembly can be accurately located, which provides convenience for later maintenance.

[0012] In addition, the control circuit board of the energy storage device proposed by the present invention also has the following additional technical features.

[0013] In some technical solutions, optionally, the switch component includes: M charging switch tubes, M is a positive integer greater than or equal to 2; N discharge switch tubes, N is a positive integer greater than or equal to 2, the N discharge switch tubes in parallel are connected in series with the M charging switch tubes in parallel, and are connected in series between the positive electrode and the positive output terminal of the battery pack; the temperature measurement component includes M first temperature sensors, N second temperature sensors and a third temperature sensor, the M first temperature sensors correspond one-to-one to the M charging switch tubes, the N second temperature sensors correspond one-to-one to the N discharge switch tubes, and the third temperature sensor is connected to the micro control unit; the micro control unit is specifically used to: during the charging and discharging process of the battery pack , control the operation of the temperature measuring component to obtain temperature information of the switch component and temperature information of the circuit board body, the temperature information of the switch component includes M first temperature values ​​output by M first temperature sensors and N second temperature values ​​output by N second temperature sensors, and the temperature information of the circuit board body includes a third temperature value output by a third temperature sensor; obtain a first temperature difference between the first target temperature value and the third temperature value, the first target temperature value is at least one temperature value among the M first temperature values ​​and the N second temperature values; when the first temperature difference is less than or equal to the first temperature threshold, determine that the charging switch tube and / or the discharging switch tube corresponding to the first target temperature value is open circuit.

[0014] In this technical solution, since the M first temperature sensors correspond one-to-one to the M charging switch tubes and the N second temperature sensors correspond one-to-one to the N discharging switch tubes, the first temperature sensor can be used to detect the operating temperature of the charging switch tube. Similarly, the second temperature sensor can be used to detect the operating temperature of the discharging switch tube.

[0015] Specifically, if the charging switch tube is short-circuited, no current will flow through the charging switch tube. When no current flows through the charging switch tube, the charging switch tube will not heat up under the action of the current. At this time, the first temperature value collected by the first temperature sensor will be the same or similar to the temperature of the circuit board body.

[0016] Similarly, if the discharge switch tube is short-circuited, no current will flow through the discharge switch tube. When no current flows through the discharge switch tube, the discharge switch tube will not heat up under the action of the current. At this time, the second temperature value collected by the second temperature sensor will be the same or similar to the temperature of the circuit board body.

[0017] Based on this, after collecting the temperature information of the switching component, the temperature difference between each of the M first temperature values ​​and the N second temperature values ​​and the third temperature value is calculated to obtain the first temperature difference. If the first temperature difference is less than or equal to the first temperature threshold, it is determined that the charging switch tube and / or the discharging switch tube corresponding to the selected first target temperature value is open-circuited.

[0018] In this process, the broken charging switch tube and / or discharging switch tube can be accurately identified during the charging and discharging process of the battery pack, so that when the broken circuit is detected, the fault point can be accurately located and the fault point can be maintained in time.

[0019] In some technical schemes, optionally, the microcontroller unit is also used to: obtain the working current, the working current includes a first charging current value determined by the analog front-end chip when the battery pack is in a charging state, and a second charging current value determined by the analog front-end chip after the battery pack stops charging; control the operation of the temperature measuring component to obtain the temperature information of the switch component and the temperature information of the circuit board body, the temperature information of the switch component includes M fourth temperature values ​​output by M first temperature sensors, and the temperature information of the circuit board body includes a fifth temperature value output by the third temperature sensor; obtain a second temperature difference between the second target temperature value and the fifth temperature value, the second target temperature value is at least one temperature value among the M fourth temperature values; when the second charging current value is equal to the first charging current value and the second temperature difference is greater than the second temperature threshold, determine that the charging switch tube corresponding to the second target temperature value is short-circuited; wherein the second temperature threshold is greater than or equal to the first temperature threshold.

[0020] In this technical solution, when a short circuit occurs in the charging switch tube, the temperature of the charging switch tube will rise. At this time, the temperature value output by the first temperature sensor will be relatively high. Correspondingly, the temperature difference between the temperature value output by the first temperature sensor and the fifth temperature value output by the third temperature sensor will also be relatively large.

[0021] The current values ​​of the battery pack when it is in the charging state and after charging is stopped, that is, the first charging current value and the second charging current value, are obtained, and after the second charging current value is collected, the temperature measuring component is controlled to measure the temperature. If the second charging current value is equal to the first charging current value, it is considered that one or more of the current M charging switch tubes are short-circuited.

[0022] At this time, the temperature difference between at least one temperature value among the M fourth temperature values ​​and the fifth temperature value output by the third temperature sensor is calculated to obtain the second temperature difference, and the second temperature difference is compared with the second temperature threshold to find the fourth temperature value whose temperature difference is greater than the second temperature threshold. Since the fourth temperature value is collected by the first temperature sensor, after finding the fourth temperature value whose temperature difference is greater than the second temperature threshold, the charging switch tube with a short circuit can be found.

[0023] Obviously, in this process, the short-circuited charging switch tube can be accurately located, so that when a short circuit is detected, the fault point can be accurately located and the fault point can be maintained in time.

[0024] In some technical schemes, optionally, the microcontroller unit is also used to: obtain the working current, the working current includes a first discharge current value determined by the analog front-end chip when the battery pack is in a discharging state, and a second discharge current value determined by the analog front-end chip after the battery pack stops discharging; control the operation of the temperature measuring component to obtain the temperature information of the switch component and the temperature information of the circuit board body, the temperature information of the switch component includes N sixth temperature values ​​output by N second temperature sensors, and the temperature information of the circuit board body includes a seventh temperature value output by a third temperature sensor; obtain a third temperature difference between the third target temperature value and the seventh temperature value, at least one temperature value among the N sixth temperature values ​​of the third target temperature value; when the second discharge current value is equal to the first discharge current value and the third temperature difference is greater than the third temperature threshold, determine that the discharge switch tube corresponding to the third target temperature value is short-circuited; wherein the third temperature threshold is greater than or equal to the first temperature threshold.

[0025] In this technical solution, when a short circuit occurs in the discharge switch tube, the temperature of the discharge switch tube will rise. At this time, the temperature value output by the second temperature sensor will be relatively high. Correspondingly, the temperature difference between the temperature value output by the second temperature sensor and the seventh temperature value output by the third temperature sensor will also be relatively large.

[0026] The current values ​​of the battery pack when it is in the discharging state and after stopping discharging, that is, the first discharge current value and the second discharge current value, are obtained. After the second discharge current value is collected, the temperature measurement component is controlled to measure the temperature. If the second discharge current value is equal to the first discharge current value, it is considered that one or more of the current M discharge switch tubes are short-circuited.

[0027] At this time, the temperature difference between at least one temperature value among the N sixth temperature values ​​and the seventh temperature value output by the third temperature sensor is calculated to obtain the third temperature difference, and the third temperature difference is compared with the third temperature threshold to find the sixth temperature value whose temperature difference is greater than the third temperature threshold. Since the sixth temperature value is collected by the second temperature sensor, after finding the sixth temperature value whose temperature difference is greater than the third temperature threshold, the discharge switch tube with a short circuit can be found.

[0028] Obviously, in this process, the discharge switch tube with a short circuit can be accurately located, so that when a short circuit is detected, the fault point can be accurately located and the fault point can be maintained in time.

[0029] In some technical schemes, optionally, the control circuit board of the energy storage device also includes: a fuse, which is connected in series between the positive electrode of the battery pack and the switch assembly, the first end of the fuse is respectively connected to the positive electrode of the battery pack and the first voltage input end of the microcontroller unit, and the second end of the fuse is respectively connected to the switch assembly and the second voltage input end of the microcontroller unit; the microcontroller unit is also used to: during the charging and discharging process of the battery pack, obtain the first voltage value input to the first voltage input end and the second voltage value input to the second voltage input end; obtain the absolute difference between the first voltage value and the second voltage value; when the absolute difference is greater than the voltage threshold, determine that the fuse is open; when the absolute difference is less than or equal to the voltage threshold and the operating current is zero, determine that the switch assembly is open.

[0030] In this technical solution, in the case where a fuse is connected in series between the positive electrode of the battery pack and the switch assembly, if the fuse is short-circuited, the solution of using the temperature information of the switch assembly and the temperature information of the circuit board body to diagnose whether the switch assembly is short-circuited is inaccurate.

[0031] Based on this, in the technical solution of the present invention, the first end and the second end of the fuse are connected to the first voltage input end and the second voltage input end of the microcontroller unit respectively, so that the microcontroller unit has the ability to read the voltage at the first end and the second end of the fuse, so that when reading the voltage at the first end and the second end of the fuse, the absolute difference between the first voltage value input at the first voltage input end and the second voltage value input at the second voltage input end is calculated, and it is judged whether the fuse is open circuit based on the absolute difference.

[0032] Specifically, if the fuse is blown, the voltage difference between the first end and the second end of the fuse is relatively large. At this time, the absolute difference between the first voltage value input into the first voltage input terminal and the second voltage value input into the second voltage input terminal is relatively large. If the absolute difference is greater than the voltage threshold, it is determined that the fuse is blown. Conversely, if the absolute difference is less than or equal to the voltage threshold and the operating current is zero, it is determined that the switch component is blown.

[0033] During this process, it is possible to accurately detect whether there is a short circuit in the switch component, and also to detect the fault condition of the fuse short circuit, thereby accurately locating the fault point and reducing the cost of subsequent maintenance.

[0034] In some technical solutions, the voltage threshold can be determined according to actual usage requirements, and its specific value will not be repeated here.

[0035] In some technical schemes, optionally, the control circuit board of the energy storage device also includes: a shunt, located between the negative electrode of the battery pack and the negative electrode output terminal, the first end of the shunt is respectively connected to the negative electrode of the battery pack and the third voltage input terminal of the analog front-end chip, and the second end of the shunt is respectively connected to the negative electrode output terminal and the fourth voltage input terminal of the analog front-end chip; wherein the analog front-end chip determines the operating current according to the voltage input by the third voltage input terminal and the fourth voltage input terminal.

[0036] In this technical solution, the shunt can be understood as a resistor with a relatively small resistance value. By connecting the first end of the shunt to the third voltage input terminal of the analog front-end chip and the second end of the shunt to the fourth voltage input terminal of the analog front-end chip, the analog front-end chip can detect the voltage difference between the first end and the second end of the shunt, and then combine the resistance value of the shunt to know the current value flowing through the shunt, and then obtain the working current.

[0037] In this process, the precise measurement of the working current can be achieved, thus ensuring the accurate identification of short circuits and short circuits.

[0038] In some technical schemes, optionally, the control circuit board of the energy storage device also includes: a logic selector, the logic selector has a first type of input terminal, a second type of input terminal and a signal output terminal, the first type of input terminal includes O ports, the O ports are respectively connected to M first temperature sensors and N second temperature sensors, the second type of input terminal is connected to the output terminal of the micro control unit, and the signal output terminal is connected to the first temperature input terminal of the micro control unit; wherein, the logic selector responds to the signal input from the second type of input terminal, and outputs the temperature value measured by at least one of the M first temperature sensors and the N second temperature sensors to the micro control unit through the signal output terminal.

[0039] In this technical solution, the logic selector can be understood as a data selector, in which the data selector selects a specified one from a group of input signals and sends it to the output end of the combinational logic circuit according to a given input address code. Sometimes it is also called a multiplexer or multiplexer.

[0040] In this technical solution, compared with directly connecting M first temperature sensors and N second temperature sensors to the micro control unit, the technical solution of the present invention connects M first temperature sensors and N second temperature sensors to the micro control unit through a logic selector, which can reduce the number of interfaces used by the micro control unit, thereby maximizing the use of the interface resources of the micro control unit.

[0041] In some technical solutions, optionally, the control circuit board of the energy storage device also includes: a power supply module, the input end of the power supply module is connected to the positive pole of the battery pack, and the output end of the power supply module is connected to the power supply end of the micro control unit for supplying power to the micro control unit.

[0042] In this technical solution, a power supply module is provided so as to supply power to the micro control unit. In this process, there is no need to additionally provide a power supply module for the micro control unit, thereby reducing the manufacturing cost of the control circuit board of the cooking device.

[0043] In some technical solutions, optionally, the control circuit board of the energy storage device also includes: a pre-charging circuit, the pre-charging circuit is connected in parallel with the discharge switch tube, and the pre-charging circuit is connected to the micro control unit.

[0044] In this technical solution, a pre-charging circuit is provided so that when the battery pack is charged, the pre-charging circuit is utilized to realize pre-charging. In this process, more protection can be provided for the battery pack, thereby improving the safety of the battery pack.

[0045] In some technical schemes, optionally, the pre-charging circuit includes: a pre-charging switch tube, a first end of the pre-charging switch tube is connected to the first end of the discharging switch tube, and a control end of the pre-charging switch tube is connected to a pre-charging control end of a microcontroller unit; a pre-charging resistor, a first end of the pre-charging resistor is connected to the second end of the pre-charging switch tube; a first diode, an anode of the first diode is connected to the second end of the pre-charging resistor, and a cathode of the first diode is connected to the second end of the discharging switch tube.

[0046] According to a second aspect of the present invention, the present invention provides an energy storage device, comprising: a battery pack; and a control circuit board of the energy storage device as described in any one of the first aspects.

[0047] According to a third aspect of the present invention, the present invention provides an energy storage system, comprising: the energy storage device as in the second aspect; and an energy storage converter, wherein the energy storage converter is connected to the energy storage device.

[0048] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0050] Figure 1 A schematic diagram of an energy storage device in the related art is shown;

[0051] Figure 2 One of the schematic diagrams of an energy storage device in an embodiment of the present invention is shown;

[0052] Figure 3 A schematic diagram showing a flow chart of a method for detecting a circuit breaker fault in an embodiment of the present invention is shown;

[0053] Figure 4 A second schematic diagram of an energy storage device according to an embodiment of the present invention is shown;

[0054] Figure 5 A schematic diagram showing a flow chart of a method for detecting a short circuit of a charging switch tube in an embodiment of the present invention is shown;

[0055] Figure 6 A third schematic diagram of an energy storage device according to an embodiment of the present invention is shown;

[0056] Figure 7 A schematic flow chart of a method for detecting a short circuit of a discharge switch tube in an embodiment of the present invention is shown;

[0057] Figure 8 A schematic flow chart of a method for detecting a circuit breaker fault in an embodiment of the present invention is shown.

[0058] in, Figure 1 The corresponding relationship between the reference numerals and the component names is as follows:

[0059] 200' energy storage device, 202' battery pack, 102' circuit board body, 104' switch assembly, 106' analog front-end chip, 108' micro control unit, FUSE' fuse, SHUNT' shunt, 110' power supply module, 112' pre-charging circuit, NMOS1' first charging switch tube, NMOS2' second charging switch tube, NMOS3' third charging switch tube, NMOS4' fourth charging switch tube, NMOS5' first discharge switch tube, NMOS6' second discharge switch tube, NMOS7' third discharge switch tube, NMOS8' fourth discharge switch tube, Pack+ positive output terminal, Pack- negative output terminal.

[0060] in, Figure 2 , Figure 4 and Figure 6 The corresponding relationship between the reference numerals and the component names is as follows:

[0061] 102 circuit board body, 104 switch component, 106 analog front-end chip, 108 temperature measurement component, 1082 first temperature sensor, 1084 second temperature sensor, 1086 third temperature sensor, 110 micro control unit, 200 energy storage device, 202 battery pack, Q1 charging switch tube, Q2 discharging switch tube, FUSE fuse, SHUNT shunt, 112 logic selector, 1122 first type input terminal, 1124 second type input terminal, 1126 signal output terminal, 114 power supply module, 116 pre-charging circuit, Q3 pre-charging switch tube, R pre-charging resistor, D first diode, Pack+ positive output terminal, Pack- negative output terminal, Vbat_AD first voltage input terminal, Vfuse_AD second voltage input terminal, PDSG pre-charging control terminal. DETAILED DESCRIPTION

[0062] In order to more clearly understand the above aspects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0063] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0064] In one embodiment of the present application, Figure 2 As shown, a control circuit board of an energy storage device is provided. The energy storage device 200 includes a battery pack 202. The control circuit board of the energy storage device includes: a circuit board body 102; a switch component 104, which is arranged on the circuit board body 102 and is connected in series between the positive electrode of the battery pack 202 and the positive electrode output terminal Pack+, and is used to control the charging and discharging of the battery pack 202; an analog front-end chip 106, which is arranged on the circuit board body 102, and the output end of the analog front-end chip 106 is connected to the control end of the switch component 104; a temperature measurement component 108, which is arranged on the circuit board body 102 and is used to measure the temperature information of the switch component 104 and the temperature information of the circuit board body 102; a micro control unit 110, which is arranged on the circuit board body 102 and is connected to the analog front-end chip 106, and is used to perform fault diagnosis on the switch component 104 according to the temperature information of the switch component 104 and the temperature information of the circuit board body 102.

[0065] In an embodiment of the present invention, a control circuit board of an energy storage device is proposed, and the control circuit board of the energy storage device includes a circuit board body 102, a switch component 104, an analog front-end chip 106, a temperature measuring component 108, and a microcontroller unit 110. The temperature measuring component 108 is provided on the circuit board body 102, and is used to measure the temperature information of the switch component 104 and the temperature information of the circuit board body 102. In this process, the state of the switch component 104 is diagnosed by detecting the temperature information of the switch component 104 and combining the temperature information of the switch component 104 with the temperature information of the circuit board body 102. In this process, the fault point in the switch component 104 can be accurately located, which provides convenience for later maintenance.

[0066] In some embodiments, optionally, the micro control unit 110 communicates with the analog front-end chip via two lines, SDA and SCL, where SDA is a data line of the I2C bus and SCL is a control line of the I2C bus.

[0067] In some embodiments, optionally, the switch component 104 includes: M charging switch tubes Q1, M is a positive integer greater than or equal to 2; N discharging switch tubes Q2, N is a positive integer greater than or equal to 2, the N discharging switch tubes Q2 connected in parallel are connected in series with the M charging switch tubes Q1 connected in parallel, and are connected in series between the positive electrode of the battery pack 202 and the positive electrode output terminal Pack+; the temperature measurement component 108 includes M first temperature sensors 1082, N second temperature sensors 1084 and a third temperature sensor 1086, the M first temperature sensors 1082 correspond to the M charging switch tubes Q1 one by one, the N second temperature sensors 1084 correspond to the N discharging switch tubes Q2 one by one, and the third temperature sensor 1086 is connected to the micro control unit 110; the micro control unit 110 is specifically used for: During the charging and discharging process of the battery pack 202, the temperature measuring component 108 is controlled to operate to obtain temperature information of the switch component 104 and the temperature information of the circuit board body 102, the temperature information of the switch component 104 includes M first temperature values ​​output by M first temperature sensors 1082 and N second temperature values ​​output by N second temperature sensors 1084, and the temperature information of the circuit board body 102 includes a third temperature value output by the third temperature sensor 1086; a first temperature difference between the first target temperature value and the third temperature value is obtained, the first target temperature value is at least one temperature value among the M first temperature values ​​and the N second temperature values; when the first temperature difference is less than or equal to the first temperature threshold, it is determined that the charging switch tube Q1 and / or the discharging switch tube Q2 corresponding to the first target temperature value is open circuited.

[0068] In this embodiment, since the M first temperature sensors 1082 correspond one-to-one to the M charging switch tubes Q1, and the N second temperature sensors 1084 correspond one-to-one to the N discharging switch tubes Q2, the first temperature sensor 1082 can be used to detect the operating temperature of the charging switch tube Q1, and similarly, the second temperature sensor 1084 can be used to detect the operating temperature of the discharging switch tube Q2.

[0069] Specifically, if the charging switch tube Q1 is short-circuited, no current will flow through the charging switch tube Q1. When no current flows through the charging switch tube Q1, the charging switch tube Q1 will not heat up under the action of the current. At this time, the first temperature value collected by the first temperature sensor 1082 will be the same or similar to the temperature of the circuit board body 102.

[0070] Similarly, if the discharge switch tube Q2 is short-circuited, no current will flow through the discharge switch tube Q2. When no current flows through the discharge switch tube Q2, the discharge switch tube Q2 will not heat up under the action of the current. At this time, the second temperature value collected by the second temperature sensor 1084 will be the same or similar to the temperature of the circuit board body 102.

[0071] Based on this, after collecting the temperature information of the switch component 104, the temperature difference between each of the M first temperature values ​​and the N second temperature values ​​and the third temperature value is calculated to obtain the first temperature difference. If the first temperature difference is less than or equal to the first temperature threshold, it is determined that the charging switch tube Q1 and / or the discharging switch tube Q2 corresponding to the selected first target temperature value is open circuit.

[0072] In this process, the disconnected charging switch tube Q1 and / or discharging switch tube Q2 can be accurately identified during the charging and discharging process of the battery pack 202, so that when the disconnection is detected, the fault point can be accurately located and maintained in time.

[0073] In some embodiments, optionally, the control circuit board of the energy storage device is arranged in a battery management system (BMS), and the charging switch tube Q1 and the discharging switch tube Q2 are NMOS. Then, when the values ​​of M and N are 4, the M charging switch tubes Q1 are represented by NMOS1, NMOS2, NMOS3 and NMOS4 respectively, and the N discharging switch tubes Q2 are represented by NMOS5, NMOS6, NMOS7 and NMOS8. At the same time, the M first temperature sensors 1082 are represented by NTC1, NTC2, NTC3 and NTC4, the N second temperature sensors 1084 are represented by NTC5, NTC6, NTC7 and NTC8, and the third temperature sensor 1086 is represented by NTC9. Then, when the first temperature threshold value is 3°C, as Figure 3 As shown, the detection method of the circuit breaker fault includes:

[0074] Step 302: The BMS system self-checks and is powered on and running normally.

[0075] Step 304 , the BMS controls the DSG and CHG channels of the analog front-end chip to be set to high level and output normally.

[0076] Step 306: The low-voltage battery power main positive circuit is powered on normally.

[0077] Step 308: The energy storage converter is configured to charge or discharge the battery, and synchronously communicates and transmits relevant charging and discharging information to the BMS system.

[0078] In step 310, the BMS detects whether the charging and discharging is stable and normal through the main negative circuit.

[0079] Step 312, the BMS system detects that the main power circuit on the battery side continuously stores the charging or discharging process for 10 minutes (continuous and stable charging and discharging), and starts to collect the temperature value information of NTC1, 2...9 respectively.

[0080] Step 314, the temperatures collected by NTC1, 2...8 are compared with the temperature collected by NCT9.

[0081] Step 316, NTCn (n=1, 2...8).

[0082] Step 318, NTCn-NTC9≤3°C, if the judgment result is yes, execute step 320, if the judgment result is no, execute step 322.

[0083] Step 320, NMOSn is disconnected.

[0084] Wherein, n is a positive integer from 1 to 9.

[0085] Step 322: NMOSn is normal.

[0086] Specifically, after the BMS system is powered on and self-tested successfully and the power main circuit is powered on successfully, the CHG and DSG channels of the analog front-end chip 106 are kept in a high-level output state, and the energy storage converter side controls the battery side to start charging or discharging operations, and transmits the power main circuit charging or discharging information to the BMS through communication. The BMS detects that the actual charging and discharging current is normal through the current acquisition module. The BMS system detects that the power main circuit on the battery side continuously saves the charging or discharging process for 10 minutes (continuous and stable charging and discharging), and starts to collect the temperature value information of NTC1, 2...9 respectively. The collected temperature values ​​of NTC1, 2...8 are compared with the temperature of NCT9 respectively. If the difference is ≤3°C, the corresponding power NMOS circuit breaker fault is identified.

[0087] For example, Figure 4As shown, the BMS system is powered on and self-tested successfully, the power main circuit is powered on successfully, the total voltage of BAT+ is 50V, and the CHG and DSG channels of the analog front-end chip 106 are both kept at a high level of 60V. The energy storage converter side controls the battery side to start discharging the rated current of 40A, and transmits the power main circuit discharge current information of 40A to the BMS through communication. The BMS detects the actual discharge current as 40A normally through the current acquisition module. The BMS system detects that the power main circuit on the battery side continues to discharge for 10 minutes (continuous and stable discharge), and starts to collect the temperature value information of NTC1, 2...9 respectively. The temperature of NTC1 is 27.4℃, the temperature of NTC2 is 35.4℃, the temperature of NTC3 is 35.7℃, the temperature of NTC4 is 34.2℃, the temperature of NTC5 is 26.2℃, the temperature of NTC6 is 26.4℃, the temperature of NTC7 is 26.8℃, and the temperature of NTC8 is 45.4℃, NTC9 temperature is 26℃, NTC1, 2...8 collected temperature values ​​are compared with NCT9 temperature respectively, NTC1-NTC9=1.4℃ difference ≤3℃, NTC5-NTC9=0.2℃ difference ≤3℃, NTC6-NTC9=0.4℃ difference ≤3℃, NTC7-NTC9=0.8℃ difference ≤3℃, then the corresponding charging power NMOS1 and discharging power NMOS5, 6, 7 open circuit faults are identified.

[0088] In some embodiments, optionally, the microcontroller unit 110 is further used to: obtain a working current, the working current including a first charging current value determined by the analog front-end chip 106 when the battery pack 202 is in a charging state, and a second charging current value determined by the analog front-end chip 106 after the battery pack 202 stops charging; control the temperature measurement component 108 to operate to obtain temperature information of the switch component 104 and temperature information of the circuit board body 102, the temperature information of the switch component 104 including M fourth temperature values ​​output by M first temperature sensors 1082, and the temperature information of the circuit board body 102 including a fifth temperature value output by the third temperature sensor 1086; obtain a second temperature difference between the second target temperature value and the fifth temperature value, the second target temperature value being at least one temperature value among the M fourth temperature values; determine that the charging switch tube Q1 corresponding to the second target temperature value is short-circuited when the second charging current value is equal to the first charging current value and the second temperature difference is greater than the second temperature threshold; wherein the second temperature threshold is greater than or equal to the first temperature threshold.

[0089] In this embodiment, when the charging switch tube Q1 is short-circuited, the temperature of the charging switch tube Q1 will increase. At this time, the temperature value output by the first temperature sensor 1082 will be relatively high. Correspondingly, the temperature difference between the temperature value output by the first temperature sensor 1082 and the fifth temperature value output by the third temperature sensor 1086 is also relatively large.

[0090] The current values ​​of the battery pack 202 when it is in the charging state and after charging is stopped, that is, the first charging current value and the second charging current value, are obtained. After the second charging current value is acquired, the temperature measuring component 108 is controlled to measure the temperature. If the second charging current value is equal to the first charging current value, it is considered that one or more of the current M charging switch tubes Q1 are short-circuited.

[0091] At this time, the temperature difference between at least one temperature value among the M fourth temperature values ​​and the fifth temperature value output by the third temperature sensor 1086 is calculated to obtain the second temperature difference, and the second temperature difference is compared with the second temperature threshold to find the fourth temperature value whose temperature difference is greater than the second temperature threshold. Since the fourth temperature value is collected by the first temperature sensor 1082, after finding the fourth temperature value whose temperature difference is greater than the second temperature threshold, the short-circuited charging switch tube Q1 can be found.

[0092] Obviously, in this process, the short-circuited charging switch tube Q1 can be accurately located, so that when a short circuit is detected, the fault point can be accurately located and the fault point can be maintained in time.

[0093] In some embodiments, optionally, Figure 5 As shown, the charging switch tube Q1 and the discharging switch tube Q2 are NMOS, then when the values ​​of M and N are 4, the M charging switch tubes Q1 are represented by NMOS1, NMOS2, NMOS3 and NMOS4 respectively, and the N discharging switch tubes Q2 are represented by NMOS5, NMOS6, NMOS7 and NMOS8. At the same time, the M first temperature sensors 1082 are represented by NTC1, NTC2, NTC3 and NTC4, the N second temperature sensors 1084 are represented by NTC5, NTC6, NTC7 and NTC8, and the third temperature sensor 1086 is represented by NTC9. Then, the detection method of the short circuit of the charging switch tube includes:

[0094] Step 502: The BMS system self-checks and is powered on and running normally.

[0095] Step 504 , the BMS controls the DSG and CHG channels of the analog front-end chip to be set to high level and output normally.

[0096] Step 506: The low-voltage battery power main positive circuit is powered on normally.

[0097] Step 508: the energy storage converter is configured to charge the battery at a set current value + X (A), and synchronously communicates and transmits relevant charging information to the BMS system.

[0098] Where +X is the set charging current.

[0099] Step 510, the BMS system controls the CHG and DSG channels of the analog front-end chip from high level to low level according to its own software logic strategy, and performs the action of cutting off the charging and discharging NMOS of the power main loop.

[0100] Step 512, the analog front-end chip of the BMS collects the real-time power main negative loop current which is still +X (A).

[0101] In step 514, the BMS system identifies that one or more (≤4) charging power NMOSs are short-circuited.

[0102] Step 516: The BMS system collects temperature information of NTC1 / 2 / 3 / 4 and NTC9 in real time.

[0103] Step 518, the collected temperatures of NTC1, 2, 3, 4 are compared with the temperature of NCT9 respectively.

[0104] Step 520, NTCn (n=1, 2...4).

[0105] Step 522, NTCn-NTC9≤3°C, if the judgment result is yes, execute step 524, if the judgment result is no, execute step 526.

[0106] Step 524: the charging power NMOSn is normal.

[0107] The charging power NMOSn is also the nth charging switch tube Q1.

[0108] Step 526: the charging power NMOSn is short-circuited.

[0109] Specifically, the BMS system self-checks and powers on normally, the BMS controls the DSG and CHG channels of the analog front-end chip 106 to set the high level output normally, and the low-voltage battery power main positive circuit is powered on normally. The PCS system saves the set current value +X (A) on the battery side to maintain the normal charging mode state. The BMS system controls the CHG and DSG channels of the analog front-end chip 106 from the high level to the low level state according to its own software logic strategy to cut off the action of charging / discharging NMOS in the power main circuit. At the same time, the analog front-end chip 106 collects the power main negative circuit current in real time. If the collected current is still X (A) at this time, it is identified that one or more (≤4) of the charging power NMOS are short-circuited. The BMS system collects the temperature value information of NTC1 / 2 / 3 / 4 and NTC9 in real time. The collected temperatures of NTC1, 2, 3, 4 are compared with the temperature of NCT9 respectively. If the difference does not meet ≤3℃, the corresponding charging power NMOS short-circuit fault is identified.

[0110] In some embodiments, optionally, the microcontroller unit 110 is also used to: obtain a working current, the working current includes a first discharge current value determined by the analog front-end chip 106 when the battery pack 202 is in a discharging state, and a second discharge current value determined by the analog front-end chip 106 after the battery pack 202 stops discharging; control the temperature measuring component 108 to operate to obtain temperature information of the switch component 104 and temperature information of the circuit board body 102, the temperature information of the switch component 104 includes N sixth temperature values ​​output by N second temperature sensors 1084, and the temperature information of the circuit board body 102 includes a seventh temperature value output by the third temperature sensor 1086; obtain a third temperature difference between the third target temperature value and the seventh temperature value, at least one temperature value among the N sixth temperature values ​​of the third target temperature value; when the second discharge current value is equal to the first discharge current value and the third temperature difference is greater than the third temperature threshold, determine that the discharge switch tube Q2 corresponding to the third target temperature value is short-circuited; wherein the third temperature threshold is greater than or equal to the first temperature threshold.

[0111] In this embodiment, when the discharge switch tube Q2 is short-circuited, the temperature of the discharge switch tube Q2 will increase. At this time, the temperature value output by the second temperature sensor 1084 will be relatively high. Correspondingly, the temperature difference between the temperature value output by the second temperature sensor 1084 and the seventh temperature value output by the third temperature sensor 1086 is also relatively large.

[0112] The current values ​​of the battery pack 202 when it is in the discharging state and after stopping discharging, that is, the first discharge current value and the second discharge current value, are obtained. After the second discharge current value is acquired, the temperature measuring component 108 is controlled to measure the temperature. If the second discharge current value is equal to the first discharge current value, it is considered that one or more of the current M discharge switch tubes Q2 are short-circuited.

[0113] At this time, the temperature difference between at least one temperature value among the N sixth temperature values ​​and the seventh temperature value output by the third temperature sensor 1086 is calculated to obtain the third temperature difference, and the third temperature difference is compared with the third temperature threshold to find the sixth temperature value whose temperature difference is greater than the third temperature threshold. Since the sixth temperature value is collected by the second temperature sensor 1084, after finding the sixth temperature value whose temperature difference is greater than the third temperature threshold, the short-circuited discharge switch tube Q2 can be found.

[0114] Obviously, in this process, the short-circuited discharge switch tube Q2 can be accurately located, so that when a short circuit is detected, the fault point can be accurately located and the fault point can be maintained in time.

[0115] In some embodiments, optionally, Figure 7As shown, the charging switch tube Q1 and the discharging switch tube Q2 are NMOS, then when the values ​​of M and N are 4, the M charging switch tubes Q1 are represented by NMOS1, NMOS2, NMOS3 and NMOS4 respectively, and the N discharging switch tubes Q2 are represented by NMOS5, NMOS6, NMOS7 and NMOS8. At the same time, the M first temperature sensors 1082 are represented by NTC1, NTC2, NTC3 and NTC4, the N second temperature sensors 1084 are represented by NTC5, NTC6, NTC7 and NTC8, and the third temperature sensor 1086 is represented by NTC9. Then, the detection method of the short circuit of the discharging switch tube includes:

[0116] Step 702: The BMS system self-checks and is powered on and running normally.

[0117] Step 704 , the BMS controls the DSG and CHG channels of the analog front-end chip to be set to high level and output normally.

[0118] Step 706, the low-voltage battery power main positive circuit is powered on normally.

[0119] Step 708: the energy storage converter is configured to discharge the battery at a set current value -X (A), and transmits the relevant discharge information to the BMS system through synchronous communication.

[0120] Where -X is the set discharge current.

[0121] Step 710, the BMS system controls the CHG and DSG channels of the analog front-end chip from high level to low level according to its own software logic strategy, and performs the action of cutting off the charging and discharging NMOS of the power main loop.

[0122] Step 712, the analog front-end chip of the BMS collects the real-time power main negative loop current which is still -X (A).

[0123] In step 714, the BMS system identifies that one or more discharge power NMOSs are short-circuited.

[0124] Step 716: The BMS system collects temperature information of NTC5 / 6 / 7 / 8 and NTC9 in real time.

[0125] Step 718, the collected temperatures of NTC5, 6, 7, 8 are compared with the temperature of NCT9 respectively.

[0126] Step 720, NTCn (n=5, 6, 7, 8).

[0127] Step 722, NTCn-NTC9≤3°C, if the judgment result is yes, execute step 724, if the judgment result is no, execute step 726.

[0128] Step 724: the discharge power NMOSn is normal.

[0129] The discharge power NMOSn is also the nth discharge switch tube Q2.

[0130] Step 726, the discharge power NMOSn is short-circuited.

[0131] Specifically, the BMS system self-checks and powers on normally, the BMS controls the DSG and CHG channels of the analog front-end chip 106 to set the high level output normally, and the low-voltage battery power main positive circuit is powered on normally. The PCS system saves the set current value -X (A) on the battery side to maintain the normal discharge mode state. The BMS system controls the CHG and DSG channels of the analog front-end chip 106 from high level to low level according to its own software logic strategy, and cuts off the charging / discharging NMOS of the power main circuit. At the same time, the analog front-end chip 106 collects the power main negative circuit current in real time. If the collected current is still -X (A) at this time, the BMS system identifies that one or more discharge power NMOS are short-circuited. The BMS system collects the temperature value information of NTC5 / 6 / 7 / 8 and NTC9 in real time. The collected temperatures of NTC5, 6, 7, and 8 are compared with the temperature of NCT9 respectively. If the difference does not meet ≤3°C, the corresponding discharge power NMOS is judged to be short-circuited.

[0132] For example, Figure 6 As shown, the BMS system self-checks and powers on normally, the DSG and CHG channels of the BMS control analog front-end chip 106 are set to high level 60V output normally, and the low-voltage battery power main positive circuit is powered on normally BAT+=50V. The PCS system side saves the set current value -40 (A) on the battery side to maintain the normal discharge mode state. The BMS system controls the CHG and DSG channels of the analog front-end chip 106 from high level (60V) to low level (50V) according to its own software logic strategy, and cuts off the charging / discharging NMOS of the power main circuit. At the same time, the power main negative circuit current is collected in real time through the analog front-end chip 106. If the collected current is still -40 (A) at this time, the BMS system identifies that one or more discharge power NMOS are short-circuited. The BMS system collects the temperature information of NTC5 / 6 / 7 / 8 and NTC9 in real time. The temperature of NTC5 is 32.2℃, the temperature of NTC6 is 31.4℃, the temperature of NTC7 is 32.4℃, the temperature of NTC8 is 27.2℃, and the temperature of NTC9 is 26℃. The temperature values ​​collected by NTC5, 6, 7, and 8 are compared with the temperature of NTC9 respectively. The difference between NTC5-NTC9=6.2℃ is greater than 3℃, the difference between NTC6-NTC9=5.4℃ is greater than 3℃, the difference between NTC7-NTC9=6.4℃ is greater than 3℃, and the difference between NTC8-NTC9=1.2℃ is less than 3℃. Then the corresponding discharge power NMOS5, 6, and 7 short circuit faults are identified.

[0133] In some embodiments, optionally, the control circuit board of the energy storage device also includes: a fuse FUSE, which is connected in series between the positive electrode of the battery pack 202 and the switch component 104, the first end of the fuse FUSE is respectively connected to the positive electrode of the battery pack 202 and the first voltage input terminal Vbat_AD of the microcontroller unit 110, and the second end of the fuse FUSE is respectively connected to the switch component 104 and the second voltage input terminal Vfuse_AD of the microcontroller unit 110; the microcontroller unit 110 is also used for: obtaining the first voltage value of the first voltage input terminal Vbat_AD and the second voltage value of the second voltage input terminal Vfuse_AD during the charging and discharging process of the battery pack 202; obtaining the absolute difference between the first voltage value and the second voltage value; determining that the fuse FUSE is open when the absolute difference is greater than the voltage threshold; determining that the switch component 104 is open when the absolute difference is less than or equal to the voltage threshold and the operating current is zero.

[0134] In this embodiment, in the case where a fuse FUSE is connected in series between the positive electrode of the battery pack 202 and the switch assembly 104, if the fuse FUSE is open-circuited, the scheme of using the temperature information of the switch assembly 104 and the temperature information of the circuit board body 102 to diagnose whether the switch assembly 104 is open-circuited is inaccurate.

[0135] Based on this, in an embodiment of the present invention, the first end and the second end of the fuse FUSE are respectively connected to the first voltage input terminal Vbat_AD and the second voltage input terminal Vfuse_AD of the microcontroller unit 110, so that the microcontroller unit 110 has the ability to read the voltage at the first end and the second end of the fuse FUSE, so as to calculate the absolute difference between the first voltage value inputted at the first voltage input terminal Vbat_AD and the second voltage value inputted at the second voltage input terminal Vfuse_AD when reading the voltage at the first end and the second end of the fuse FUSE, and judge whether the fuse FUSE is open circuit based on the absolute difference.

[0136] Specifically, if the fuse FUSE is open, the voltage difference between the first end and the second end of the fuse FUSE is relatively large. At this time, the absolute difference between the first voltage value inputted by the first voltage input terminal Vbat_AD and the second voltage value inputted by the second voltage input terminal is relatively large. If the absolute difference is greater than the voltage threshold, it is determined that the fuse FUSE is open. Otherwise, if the absolute difference is less than or equal to the voltage threshold and the operating current is zero, it is determined that the switch component 104 is open.

[0137] In this process, it is possible to accurately detect whether the switch assembly 104 is open-circuited, and also detect the fault condition of the fuse FUSE being open-circuited, thereby accurately locating the fault point, thereby reducing the cost of subsequent maintenance.

[0138] In some embodiments, the voltage threshold can be set according to actual usage requirements, and its specific value will not be repeated here.

[0139] In some embodiments, optionally, Figure 8 As shown, the detection method of the circuit breaker fault includes:

[0140] Step 802: BMS power-on self-test is successful.

[0141] Step 804: The main power circuit on the battery side is powered on successfully.

[0142] Step 806: CHG and DSG channels of the analog front-end chip maintain a high level output state.

[0143] Step 808: The energy storage converter side controls the battery side to start charging or discharging operations, and transmits the power main loop charging or discharging information to the BMS through communication.

[0144] Step 810, the BMS detects the actual charge and discharge current through the current acquisition module, and the micro control unit synchronously acquires the voltage values ​​Vbat_AD and Vfuse_AD at both ends of the power FUSE.

[0145] Step 812, |Vbat_AD-Vfuse_AD|≤2V. If the judgment result is yes, execute step 814; if the judgment result is no, execute step 816.

[0146] Step 814: The BMS system collects the power main loop current as 0A.

[0147] Step 816, determine whether the fuse is open.

[0148] Step 818, determine whether there are multiple (4) open circuit faults in the charge and discharge power NMOS.

[0149] The charging and discharging power NMOS is also the charging switch tube Q1 or the discharging switch tube Q2 in the present application.

[0150] Specifically, after the BMS system is powered on and self-tested successfully, and the power main circuit is powered on successfully, the CHG and DSG channels of the analog front-end chip 106 are kept in a high-level output state, and the PCS side controls the battery side to start charging or discharging operations, and transmits the power main circuit charging or discharging information to the BMS through communication. The BMS detects the actual charging and discharging current through the current acquisition module, and the MCU synchronously collects the voltage values ​​Vbat_AD and Vfuse_AD at both ends of the power FUSE. If |Vbat_AD-Vfuse_AD|≤2V is satisfied and the BMS system collects the power main circuit current of 0A, it is determined that there are multiple (4) open circuit faults in the charging and discharging power NMOS.

[0151] In this embodiment, when one or more (<4) of the charging power NMOS1 / 2 / 3 / 4 are short-circuited or one or more (<4) of the discharging NMOS5 / 6 / 7 / 8 are short-circuited, the charging power NMOS or discharging power NMOS with short-circuit fault can be immediately identified and located, which greatly improves the reliability and safety of the low-voltage energy storage battery system. The voltage across the fuse FUSE of the power main circuit is collected, but if the fuse FUSE is blown, it will not be misjudged as a short-circuit of the main circuit power NMOS.

[0152] In some embodiments, optionally, the control circuit board of the energy storage device also includes: a shunt SHUNT, located between the negative electrode of the battery pack 202 and the negative electrode output terminal Pack-, the first end of the shunt SHUNT is respectively connected to the negative electrode of the battery pack 202 and the third voltage input terminal SHUNT_P of the analog front-end chip 106, and the second end of the shunt SHUNT is respectively connected to the negative electrode output terminal Pack- and the fourth voltage input terminal SHUNT_N of the analog front-end chip 106; wherein the analog front-end chip 106 determines the operating current according to the voltage input by the third voltage input terminal SHUNT_P and the fourth voltage input terminal SHUNT_N.

[0153] In this embodiment, the shunt SHUNT can be understood as a resistor with a relatively small resistance value. By connecting the first end of the shunt SHUNT to the third voltage input terminal of the analog front-end chip 106 and the second end of the shunt SHUNT to the fourth voltage input terminal of the analog front-end chip 106, the analog front-end chip 106 can detect the voltage difference between the first end and the second end of the shunt SHUNT, and then combine the resistance value of the shunt SHUNT to know the current value flowing through the shunt SHUNT, and then obtain the working current.

[0154] In this process, the precise measurement of the working current can be achieved, thus ensuring the accurate identification of short circuits and short circuits.

[0155] In some embodiments, optionally, the control circuit board of the energy storage device also includes: a logic selector 112, the logic selector 112 has a first type input terminal 1122, a second type input terminal 1124 and a signal output terminal 1126, the first type input terminal 1122 includes O ports, the O ports are respectively connected to M first temperature sensors 1082 and N second temperature sensors 1084, the second type input terminal 1124 is connected to the output terminal of the micro control unit 110, and the signal output terminal 1126 is connected to the first temperature input terminal of the micro control unit 110; wherein, the logic selector 112 responds to the signal input from the second type input terminal 1124, and outputs the temperature value measured by at least one of the M first temperature sensors 1082 and the N second temperature sensors 1084 to the micro control unit 110 through the signal output terminal 1126.

[0156] In this embodiment, the logic selector 112 can be understood as a data selector, wherein the data selector selects a specified one from a group of input signals according to a given input address code and sends it to the combinational logic circuit of the output terminal. It is sometimes also called a multiplexer or a multiplexer.

[0157] In this embodiment, compared with directly connecting M first temperature sensors 1082 and N second temperature sensors 1084 to the microcontroller unit 110, the embodiment of the present invention connects M first temperature sensors 1082 and N second temperature sensors 1084 to the microcontroller unit 110 through a logic selector 112, which can reduce the number of interfaces used by the microcontroller unit 110, thereby maximizing the use of the interface resources of the microcontroller unit 110.

[0158] In some embodiments, optionally, the first type of input terminal 1122 includes IN1, IN2, IN3, IN4, IN5, IN6, IN7, IN8, the second type of input terminal 1124 includes three CTRL1 interfaces, and the signal output terminal 1126 is an OUT interface. At this time, the first temperature input terminal is ADC_NTC, and the output terminal connected to the second type of input terminal 1124 in the micro control unit 110 includes GPIO1, GPIO2 and GPIO3.

[0159] In some embodiments, optionally, the control circuit board of the energy storage device also includes: a power supply module 114, the input end of the power supply module 114 is connected to the positive pole of the battery pack 202, and the output end of the power supply module 114 is connected to the power supply end of the micro control unit 110, for supplying power to the micro control unit 110.

[0160] In this embodiment, a power supply module 114 is provided to supply power to the micro control unit 110. In this process, there is no need to additionally provide a power supply module 114 for the micro control unit 110, thereby reducing the manufacturing cost of the control circuit board of the cooking device.

[0161] In some embodiments, optionally, the power supply module 114 includes a direct current transformer module DC / DC, a power supply direct current transformer module POWER DC / DC and an output voltage module VREF_3V.

[0162] In some embodiments, optionally, the control circuit board of the energy storage device further includes: a pre-charging circuit 116 , the pre-charging circuit 116 is connected in parallel with the discharge switch tube Q2 , and the pre-charging circuit 116 is connected to the micro control unit 110 .

[0163] In this embodiment, a pre-charging circuit 116 is provided so that when the battery pack 202 is charged, the pre-charging circuit 116 is utilized to implement pre-charging. In this process, more protection can be provided for the battery pack 202, thereby improving the safety of the battery pack 202.

[0164] In some embodiments, optionally, the pre-charging circuit 116 includes: a pre-charging switch tube Q3, a first end of the pre-charging switch tube Q3 is connected to the first end of the discharge switch tube Q2, and a control end of the pre-charging switch tube Q3 is connected to a pre-charging control end PDSG of the microcontroller unit 110; a pre-charging resistor R, a first end of the pre-charging resistor R is connected to the second end of the pre-charging switch tube Q3; a first diode D, an anode of the first diode D is connected to the second end of the pre-charging resistor R, and a cathode of the first diode D is connected to the second end of the discharge switch tube Q2.

[0165] In some embodiments, the present invention provides an energy storage device 200, comprising: a battery pack 202; and a control circuit board of the energy storage device as described in any one of the first aspects.

[0166] In some embodiments, the present invention provides an energy storage system, including: the energy storage device 200 as described above; and an energy storage converter, wherein the energy storage converter is connected to the energy storage device 200 .

[0167] The term "first" or "second" in the specification and claims of the present application may include one or more of the features explicitly or implicitly. In the textual description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0168] In the text description of the present invention, it is understood that, except for explicit provisions and limitations, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be fixed connection, detachable connection, or integral connection; it can be mechanical structure connection or electrical connection; it can be direct connection between the two, or indirect connection between the two through an intermediate medium, or it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0169] In the claims, specification and drawings of the present invention, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the claims, specification and drawings of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0170] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control circuit board for an energy storage device, characterized in that: The energy storage device includes a battery pack, and the control circuit board of the energy storage device includes: Circuit board body; A switch assembly, provided on the circuit board body, connected in series between the positive electrode and the positive electrode output terminal of the battery pack, and used for controlling the charging and discharging of the battery pack; An analog front-end chip is disposed on the circuit board body, and an output end of the analog front-end chip is connected to a control end of the switch component; A temperature measuring component, provided on the circuit board body, for measuring the temperature information of the switch component and the temperature information of the circuit board body; A microcontrol unit is disposed on the circuit board body and connected to the analog front-end chip, and is used for performing fault diagnosis on the switch component according to temperature information of the switch component and temperature information of the circuit board body.

2. The control circuit board of the energy storage device according to claim 1, characterized in that: The switch assembly comprises: M charging switch tubes, where M is a positive integer greater than or equal to 2; N discharge switch tubes, N is a positive integer greater than or equal to 2, the N discharge switch tubes connected in parallel and the M charge switch tubes connected in parallel are connected in series between the positive electrode of the battery pack and the positive electrode output terminal; The temperature measurement component includes M first temperature sensors, N second temperature sensors and a third temperature sensor, the M first temperature sensors correspond one-to-one to the M charging switch tubes, the N second temperature sensors correspond one-to-one to the N discharging switch tubes, and the third temperature sensor is connected to the micro control unit; The micro control unit is specifically used for: During the charging and discharging process of the battery pack, the temperature measuring component is controlled to operate so as to obtain temperature information of the switch component and temperature information of the circuit board body, wherein the temperature information of the switch component includes M first temperature values ​​output by M first temperature sensors and N second temperature values ​​output by N second temperature sensors, and the temperature information of the circuit board body includes a third temperature value output by the third temperature sensor; Acquire a first temperature difference between a first target temperature value and the third temperature value, wherein the first target temperature value is at least one temperature value among the M first temperature values ​​and the N second temperature values; When the first temperature difference is less than or equal to a first temperature threshold, it is determined that the charging switch tube and / or the discharging switch tube corresponding to the first target temperature value is open circuited.

3. The control circuit board of the energy storage device according to claim 2, characterized in that: The micro control unit is also used for: Acquire a working current, wherein the working current includes a first charging current value determined by the analog front-end chip when the battery pack is in a charging state, and a second charging current value determined by the analog front-end chip after the battery pack stops charging; Controlling the temperature measuring component to operate so as to obtain temperature information of the switch component and temperature information of the circuit board body, wherein the temperature information of the switch component includes M fourth temperature values ​​output by the M first temperature sensors, and the temperature information of the circuit board body includes a fifth temperature value output by the third temperature sensor; Acquire a second temperature difference between a second target temperature value and the fifth temperature value, wherein the second target temperature value is at least one temperature value among the M fourth temperature values; When the second charging current value is equal to the first charging current value and the second temperature difference value is greater than a second temperature threshold, determining that the charging switch tube corresponding to the second target temperature value is short-circuited; The second temperature threshold is greater than or equal to the first temperature threshold.

4. The control circuit board of the energy storage device according to claim 2, characterized in that: The micro control unit is also used for: Acquire a working current, wherein the working current includes a first discharge current value determined by the analog front-end chip when the battery pack is in a discharge state, and a second discharge current value determined by the analog front-end chip after the battery pack stops discharging; Controlling the temperature measuring component to operate so as to obtain temperature information of the switch component and temperature information of the circuit board body, wherein the temperature information of the switch component includes N sixth temperature values ​​output by N second temperature sensors, and the temperature information of the circuit board body includes the seventh temperature value output by the third temperature sensor; Acquire a third temperature difference between a third target temperature value and the seventh temperature value, wherein the third target temperature value is at least one temperature value among the N sixth temperature values; When the second discharge current value is equal to the first discharge current value and the third temperature difference value is greater than a third temperature threshold, determining that the discharge switch tube corresponding to the third target temperature value is short-circuited; Wherein, the third temperature threshold is greater than or equal to the first temperature threshold.

5. The control circuit board of the energy storage device according to claim 2, characterized in that: The control circuit board of the energy storage device also includes: A fuse is connected in series between the positive electrode of the battery pack and the switch assembly, wherein the first end of the fuse is connected to the positive electrode of the battery pack and the first voltage input end of the micro control unit respectively, and the second end of the fuse is connected to the switch assembly and the second voltage input end of the micro control unit respectively; The micro control unit is also used for: During the charging and discharging process of the battery pack, obtaining a first voltage value inputted by the first voltage input terminal and a second voltage value inputted by the second voltage input terminal; Obtaining an absolute difference between the first voltage value and the second voltage value; When the absolute difference is greater than a voltage threshold, determining that the fuse is open; When the absolute difference is less than or equal to the voltage threshold and the operating current is zero, it is determined that the switch component is open-circuited.

6. The control circuit board of the energy storage device according to any one of claims 3 to 5, characterized in that: The control circuit board of the energy storage device also includes: A shunt is located between the negative electrode of the battery pack and the negative electrode output terminal, wherein a first end of the shunt is respectively connected to the negative electrode of the battery pack and the third voltage input terminal of the analog front-end chip, and a second end of the shunt is respectively connected to the negative electrode output terminal and the fourth voltage input terminal of the analog front-end chip; Wherein, the analog front-end chip determines the operating current according to the voltages input by the third voltage input terminal and the fourth voltage input terminal.

7. The control circuit board of the energy storage device according to any one of claims 2 to 4, characterized in that: The control circuit board of the energy storage device also includes: A logic selector, wherein the logic selector has a first type input terminal, a second type input terminal and a signal output terminal, the first type input terminal includes O ports, the O ports are respectively connected to the M first temperature sensors and the N second temperature sensors, the second type input terminal is connected to the output terminal of the micro control unit, and the signal output terminal is connected to the first temperature input terminal of the micro control unit; The logic selector responds to the signal input from the second type input terminal and outputs the temperature value measured by at least one of the M first temperature sensors and the N second temperature sensors to the micro control unit through the signal output terminal.

8. The control circuit board of the energy storage device according to any one of claims 1 to 4, characterized in that: The control circuit board of the energy storage device also includes: A power supply module, wherein the input end of the power supply module is connected to the positive electrode of the battery pack, and the output end of the power supply module is connected to the power supply end of the micro control unit, for supplying power to the micro control unit.

9. The control circuit board of the energy storage device according to any one of claims 2 to 4, characterized in that: The control circuit board of the energy storage device also includes: A pre-charging circuit, wherein the pre-charging circuit is connected in parallel with the discharge switch tube, and the pre-charging circuit is connected to the micro control unit.

10. The control circuit board of the energy storage device according to claim 9, characterized in that: The pre-charge circuit comprises: A pre-charging switch tube, wherein a first end of the pre-charging switch tube is connected to a first end of the discharging switch tube, and a control end of the pre-charging switch tube is connected to a pre-charging control end of the micro control unit; A pre-charging resistor, a first end of which is connected to a second end of the pre-charging switch tube; A first diode, wherein an anode of the first diode is connected to the second end of the pre-charging resistor, and a cathode of the first diode is connected to the second end of the discharge switch tube.

11. An energy storage device, characterized in that: include: Battery pack; A control circuit board for an energy storage device as claimed in any one of claims 1 to 10.

12. An energy storage system, characterized in that: include: The energy storage device according to claim 11; An energy storage converter is connected to the energy storage device.

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