In-situ detection circuit of battery pack and energy storage power supply system

Abstract

The utility model relates to an in-situ detection circuit of a battery pack and an energy storage power supply system. The in-place detection circuit comprises a switch control unit, a first voltage stabilization filtering unit, a voltage division unit, a voltage acquisition unit and a control unit. One end of the voltage dividing unit is electrically connected with the interface end of the auxiliary package, the other end of the voltage dividing unit is electrically connected with the switch control unit and the voltage acquisition unit, the voltage acquisition unit is electrically connected with the switch control unit and the control unit, and the switch control unit is further electrically connected with the first voltage-stabilizing filtering unit which is further electrically connected with the control unit. The switch control unit is also electrically connected with a power supply; when the interface end of the auxiliary packet is connected with one end of the voltage dividing unit, the auxiliary packet and the in-place detection circuit form a detection loop, and the switch control unit is conducted, so that the control unit identifies the access of the auxiliary packet and judges the access number of the auxiliary packet according to the voltage acquired by the voltage acquisition unit. According to the invention, the auxiliary package insertion can be identified, the identification of the auxiliary package insertion number can be realized, and the safety and reliability of the system can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to an in-situ detection circuit of a battery pack and an energy storage power supply system. BACKGROUND

[0002] In an energy storage system, battery packs are usually divided into master packs and slave packs, which are often used in parallel. In actual applications, due to different energy storage requirements, battery packs with different capacities may be needed. However, the more battery packs are added, the more energy they can provide, so the number of battery packs needs to be limited. If the capacities of the battery packs are different, the number of corresponding battery packs also needs to be limited to avoid exceeding the maximum parallel connection number defined by the product and to ensure the safety of the energy storage system. However, although the prior art proposes to protect the battery, it still cannot identify the number of slave packs connected to the master pack to avoid exceeding the maximum parallel connection number defined by the product, which results in low safety of the energy storage system. CONTENT OF THE UTILITY MODEL

[0003] The present application provides an in-situ detection circuit of a battery pack and an energy storage power supply system, which can solve the technical problem of the prior art that the number of slave packs connected to the master pack cannot be identified to avoid exceeding the maximum parallel connection number defined by the product, which results in low safety of the energy storage system.

[0004] According to one aspect of an embodiment of the present application, the present application provides an in-situ detection circuit of a battery pack, which is applied to a master battery pack in an energy storage power supply system, the master battery pack is used to be electrically connected with a slave pack in the energy storage power supply system, and the in-situ detection circuit comprises a switch control unit, a first voltage stabilizing and filtering unit, a voltage dividing unit, a voltage collecting unit and a control unit. A first end of the voltage dividing unit is electrically connected with an interface end of the slave pack, a second end of the voltage dividing unit is respectively electrically connected with a first end of the switch control unit and a first end of the voltage collecting unit, the first end of the voltage collecting unit is electrically connected with a first end of the switch control unit, a second end of the voltage collecting unit is electrically connected with the control unit, a second end of the switch control unit is electrically connected with a first end of the first voltage stabilizing and filtering unit, a second end of the first voltage stabilizing and filtering unit is electrically connected with the control unit, and the second end of the switch control unit is also electrically connected with a power supply. When the interface end of the slave pack is connected to the first end of the voltage dividing unit, the slave pack and the in-situ detection circuit form a detection loop, so that the switch control unit is turned on, the control unit confirms the connection of the slave pack, and the number of connected slave packs is determined according to the voltage collected by the voltage collecting unit.

[0005] Optionally, a second voltage stabilizing and filtering unit is further included, a first end of the second voltage stabilizing and filtering unit is respectively electrically connected with the first end of the voltage dividing unit and the interface end of the slave pack, and a second end of the second voltage stabilizing and filtering unit is grounded.

[0006] Optionally, the third voltage stabilizing filter unit is further provided; the first end of the third voltage stabilizing filter unit is electrically connected to the first end of the control unit and the switch control unit respectively, and the second end of the third voltage stabilizing filter unit is grounded.

[0007] Optionally, the switch control unit comprises a triode, a first resistor, a second resistor, a third resistor and a first capacitor; the collector of the triode is electrically connected to one end of the third resistor, the emitter of the triode is electrically connected to the power supply, the base of the triode is electrically connected to one end of the second resistor; the first resistor is electrically connected between the base and the emitter of the triode, one end of the first capacitor is electrically connected to the power supply, the other end of the first capacitor is grounded, and the other end of the third resistor is electrically connected to the first end of the first voltage stabilizing filter unit.

[0008] Optionally, the first voltage stabilizing filter unit comprises a fourth resistor, a fifth resistor and a second capacitor; one end of the fourth resistor is electrically connected to the other end of the third resistor, the other end of the fourth resistor is electrically connected to the first end of the control unit; the fifth resistor and the second capacitor are connected in parallel, one end of the fifth resistor and the second capacitor is electrically connected between the third resistor and the fourth resistor, and the other end of the fifth resistor and the second capacitor is grounded.

[0009] Optionally, the second voltage stabilizing filter unit comprises a third capacitor, one end of the third capacitor is electrically connected to the first end of the voltage dividing unit and the interface end of the secondary package, and the other end of the third capacitor is grounded.

[0010] Optionally, the third voltage stabilizing filter unit comprises a sixth resistor and a fourth capacitor; one end of the sixth resistor is electrically connected to the second end of the control unit, the other end of the sixth resistor is electrically connected between the second resistor and the voltage dividing unit; one end of the fourth capacitor is electrically connected between the second end of the control unit and the sixth resistor, and the other end of the fourth capacitor is grounded.

[0011] Optionally, the voltage dividing unit comprises a diode, the negative electrode of the diode is the first end of the voltage dividing unit, the first end of the voltage dividing unit is electrically connected to the interface end of the secondary package, the positive electrode of the diode is the second end of the voltage dividing unit, and the second end of the voltage dividing unit is electrically connected to the voltage collecting unit.

[0012] Optionally, a grounding unit is further provided; one end of the grounding unit is electrically connected to the other interface end of the secondary package, and the second end of the grounding unit is grounded; when one interface end of the secondary package is electrically connected to the first end of the voltage dividing unit, and the other interface end of the secondary package is electrically connected to the first end of the grounding unit, the secondary package and the in-place detection circuit form a detection loop.

[0013] According to another aspect of the embodiments of the present application, the present application provides a storage power supply system, which comprises a main battery pack and a sub-pack, the in-situ detection circuit is included in the main battery pack; the in-situ detection resistor is included in the sub-pack, one end of the in-situ detection resistor is electrically connected with the first end of the voltage dividing unit in the main battery pack, when the ground unit is included in the main battery pack, the second end of the in-situ detection resistor is electrically connected with the first end of the ground unit, when the ground unit is not included in the battery pack, the other end of the in-situ detection resistor is grounded.

[0014] Compared with the related art, the above technical solution provided by the embodiments of the present application has the following advantages:

[0015] The present application provides an in-situ detection circuit of a battery pack, which is applied to a main battery pack in a storage power supply system, the main battery pack is used to be electrically connected with a sub-pack in the storage power supply system, the in-situ detection circuit comprises a switch control unit, a first voltage stabilizing filter unit, a voltage dividing unit, a voltage sampling unit and a control unit, when the interface end of the sub-pack is connected to the first end of the voltage dividing unit, the sub-pack and the in-situ detection circuit form a detection loop, the voltage generated in the circuit is input to the switch control unit to make the switch control unit conductive, and then the control unit receives the input of the voltage to confirm the connection of the sub-pack; in addition, the voltage in the circuit will change to different degrees based on the number of connected sub-packs, after the switch control unit is conductive, the control unit can identify the number of sub-packs connected to the main battery pack according to the voltage sampled by the voltage sampling unit and the voltage drop generated by the switch control unit and the voltage dividing unit. In this way, based on the in-situ detection circuit, not only the recognition of the sub-pack inserted into the main battery pack can be realized, but also the recognition of the number of sub-packs inserted into the main battery pack can be realized, which is beneficial to control the connected sub-packs by the control unit when the number of connected sub-packs exceeds the limited number, preventing the problem that the sub-packs cannot be recognized due to the continuous wake-up of the sub-packs by the main battery pack caused by the connection of the excessive number of sub-packs, and improving the safety and reliability of the storage system. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the accompanying drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0018] Figure 1A module schematic diagram of an in-place detection circuit of a battery pack according to an embodiment of the present application is provided.

[0019] Figure 2 A circuit diagram of another optional in-place detection circuit of a battery pack according to an embodiment of the present application is provided.

[0020] Figure 3 An optional energy storage power supply system schematic diagram according to an embodiment of the present application is provided.

[0021] Legend: 1, main battery pack, 11, switch control unit, 12, first voltage stabilizing and filtering unit, 13, voltage dividing unit, 14, voltage acquisition unit, 15, control unit, 16, second voltage stabilizing and filtering unit, 17, third voltage stabilizing and filtering unit, 18, grounding unit, 2, auxiliary pack. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0023] In the prior art, the number of auxiliary packs connected to the main pack cannot be identified to avoid exceeding the maximum number of parallel connection defined by the product, and the safety of the energy storage system is low.

[0024] To solve the aforementioned problems, according to an aspect of an embodiment of the present application, an in-place detection circuit of a battery pack is provided. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0025] In combination with Figure 1 as shown, Figure 1 The in-place detection circuit of the battery pack according to the embodiment of the present application is applied to the main battery pack 1 in the energy storage power supply system, and the main battery pack 1 is used to be electrically connected with the auxiliary pack in the energy storage power supply system. The in-place detection circuit includes a switch control unit 11, a first voltage stabilizing and filtering unit 12, a voltage dividing unit 13, a voltage acquisition unit 14 and a control unit 15.

[0026] The first end of the voltage dividing unit 13 is electrically connected to the interface end of the sub-pack, the second end of the voltage dividing unit 13 is electrically connected to the first end of the voltage collecting unit 14 and the switch control unit 11 respectively, the first end of the voltage collecting unit 14 is electrically connected to the first end of the switch control unit 11, the second end of the voltage collecting unit 14 is electrically connected to the control unit 15, the second end of the switch control unit 11 is electrically connected to the first end of the first voltage stabilizing and filtering unit 12, the second end of the first voltage stabilizing and filtering unit 12 is electrically connected to the control unit 15, and the second end of the switch control unit 11 is also electrically connected to the power supply;

[0027] When the interface end of the sub-pack is connected to the first end of the voltage dividing unit 13, the sub-pack and the in-situ detection circuit form a detection loop, so that the switch control unit 11 is turned on, the control unit 15 confirms the connection of the sub-pack, and the number of connected sub-packs is determined according to the voltage collected by the voltage collecting unit 14.

[0028] The in-situ detection circuit of the battery pack provided by the embodiment can be applied to the main battery pack 1 in the energy storage power supply system, and the main battery pack 1 is used to be electrically connected with the sub-packs in the energy storage power supply system. The above-mentioned energy storage power supply system can be used in various devices, including but not limited to automobiles, electrical equipment, household electronic equipment, etc. When there are multiple sub-packs 2 connected to the main battery pack 1, the sub-packs 2 will be connected in parallel. The connection of the sub-packs 2 to the main battery pack 1 will cause the voltage in the in-situ detection circuit of the main battery pack 1 to change, and the number of connected sub-packs 2 will also cause the voltage in the circuit to change.

[0029] When the interface end of the sub-pack is connected to the first end of the voltage dividing unit 13, the sub-pack and the in-situ detection circuit form a detection loop, so that the switch control unit 11 is turned on, the control unit 15 confirms the connection of the sub-pack, and the number of connected sub-packs is determined according to the voltage collected by the voltage collecting unit 14.

[0030] The first voltage stabilizing and filtering unit 12 is used to stabilize and filter the voltage received by the control unit 15, so that the voltage is stably output, and the control unit 15 can more accurately identify the connection of the sub-pack. The voltage dividing unit 13 is used to divide the voltage in the circuit, and specifically, the voltage dividing unit 13 can be a resistor or other components with voltage dividing function. The voltage collecting unit 14 is connected to the control unit 15 and the switch control unit 11, and is used to collect the voltage in the circuit after the switch control unit 11 is turned on and input the voltage into the control unit 15 to identify the number of connected sub-packs. The control unit 15 is used to control the whole circuit as an MCU, and can also exchange information with the outside, including sending power data to the upper level, receiving instructions, etc. In this embodiment, the control unit 15 is used to identify the connection of the sub-pack, and determine the number of connected sub-packs according to the voltage collected by the voltage collecting unit 14.

[0031] Specifically, when the interface end of the sub-pack is connected to the first end of the voltage dividing unit 13, the sub-pack and the in-situ detection circuit form a detection loop, and the voltage generated in the circuit is input to the switch control unit 11 to make the switch control unit 11 meet the opening condition and thus be turned on. After being turned on, the voltage flows through the first voltage stabilizing and filtering unit 12 to be stabilized and filtered, and then is output to the control unit 15. If the control unit 15 receives the voltage input, it is confirmed that the sub-pack is connected.

[0032] Specifically, the skilled in the art can set a grounding end on the sub-pack or other technical means to make the sub-pack and the in-situ detection circuit form a detection loop, which is not limited herein.

[0033] Further, the voltage in the circuit will change to different degrees based on the number of sub-packs connected. After the detection loop is formed, the switch control unit 11 is turned on and a voltage drop is generated, the voltage dividing unit 13 divides the voltage, and the voltage sampling unit 14 samples the voltage and inputs it to the control unit 15. The control unit 15 can determine the number of sub-packs connected to the main battery pack 1 according to the voltage sampled by the voltage sampling unit, the voltage drop generated by the switch control unit 11, and the voltage drop generated by the voltage dividing unit 13.

[0034] In the embodiment of the utility model, when the interface end of the sub-pack is connected to the first end of the voltage dividing unit 13, the sub-pack and the in-situ detection circuit form a detection loop, and the voltage generated in the circuit is input to the switch control unit 11 to make the switch control unit 11 turned on, and then the control unit 15 receives the voltage input to confirm that the sub-pack is connected. In addition, the voltage in the circuit will change to different degrees based on the number of sub-packs connected. After the switch control unit 11 is turned on, the control unit 15 can identify the number of sub-packs connected to the main battery pack 1 according to the voltage sampled by the voltage sampling unit 14 and the voltage drops generated by the switch control unit 11 and the voltage dividing unit 13. In this way, based on the in-situ detection circuit, not only the recognition of the sub-pack insertion into the main battery pack 1 can be realized, but also the recognition of the number of sub-packs inserted into the main battery pack 1 can be realized, which is beneficial to controlling the connected sub-packs through the control unit 15 when the number of sub-packs connected exceeds the limited number, preventing the problem that the sub-packs cannot be recognized due to the excessive number of sub-packs connected and thus the sub-packs are continuously awakened by the main battery pack 1, and improving the safety and reliability of the energy storage system.

[0035] In some optional embodiments, in combination with Figure 2 As shown, the switch control unit 11 includes a triode, a first resistor, a second resistor, a third resistor, and a first capacitor.

[0036] The collector of the triode is electrically connected to one end of the third resistor, the emitter of the triode is electrically connected to a power supply, and the base of the triode is electrically connected to one end of the second resistor.

[0037] The first resistor is electrically connected between the base and the emitter of the triode, one end of the first capacitor is electrically connected to a power supply, the other end of the first capacitor is grounded, and the other end of the third resistor is electrically connected to the first end of the first voltage stabilizing and filtering unit 12.

[0038] In combination Figure 1 As shown in the figure, the triode Q1 functions as a switch. After the sub-pack 2 is connected to the main battery pack 1, a detection loop is formed between the sub-pack and the in-place detection circuit, and a voltage is generated in the circuit. The triode Q1 is turned on, and after being turned on, the voltage flows to the control unit 15, so that the control unit 15 recognizes that the sub-pack is connected. After being turned on, the triode Q1 will generate a 0.7V voltage drop on the loop. The triode Q1 can be a PNP triode, or the triode Q1 can be replaced by other components with switching characteristics, including field effect transistors (MOS tubes), relays, optocouplers, and the like.

[0039] In some examples, when the triode Q1 is a PNP triode, the emitter (E) of the PNP triode Q1 is provided with 3.3V_VDD by the power supply; the collector (C) is electrically connected to the first voltage stabilizing and filtering unit 12 after being current-limited by the third resistor R3, and is electrically connected to the first interface PL_Int of the control unit 15 through the first voltage stabilizing and filtering unit 12; and the base (B) is electrically connected to the second end of the voltage dividing unit 13 and the first end of the voltage collecting unit 14 after being connected in series with the second resistor R2.

[0040] Further, the first capacitor C1 connected between the emitter of the triode Q1 and the power supply can perform voltage stabilizing and filtering on the connected power supply. The first resistor R1 electrically connected between the base and the emitter of the triode Q1 can ensure that the VDD provided by the power supply can flow to the emitter, and can ensure that the triode Q1 is turned on after the sub-pack 2 is connected to the main battery pack 1. When the triode Q1 is turned on in the amplification state, the base current needs to be controlled within an appropriate range to prevent the triode Q1 from being excessively amplified or entering the saturation region, or even being damaged due to excessive current. Therefore, by connecting the second resistor R2 in series, the size of the base current can be effectively controlled, thereby protecting the triode Q1 and ensuring stable operation of the triode Q1.

[0041] Further, if the sub-pack 2 is connected to the main pack 1, the sub-pack 2 and the in-place detection circuit form a detection loop, the CE (collector-emitter) of the transistor Q1 meets the opening condition, the CE is turned on, and the first interface PL Int of the control unit 15 is pulled high. Therefore, whether the sub-pack 2 is connected can be identified based on whether the first interface PL Int is pulled high. Specifically, when there is no sub-pack 2 connected, the switch control unit 11 remains in the off state, and the first interface PL Int of the MCU is in a low state, indicating that there is no sub-pack 2 connected to the main pack 1. When there is a sub-pack 2 connected, the switch control unit 11 remains in the on state, and the first interface PL Int of the MCU is in a high state, indicating that there is a sub-pack 2 connected to the main pack 1.

[0042] In the embodiment, the transistor Q1 can control the circuit to be turned on, so that the voltage generated in the circuit when the sub-pack 2 is connected can flow to the first interface of the control unit 15, thereby enabling the control unit 15 to identify whether the sub-pack 2 is connected. The first resistor R1 connected between the base and the emitter of the transistor Q1 can ensure that the transistor Q1 is turned on, and the second resistor R2 can protect the transistor Q1 and ensure its stable operation. The third resistor can be connected for current limiting, and the first capacitor C1 can be connected for voltage stabilizing and filtering of the power supply.

[0043] In some optional embodiments, in combination with Figure 2 As shown, the first voltage stabilizing and filtering unit 12 includes a fourth resistor, a fifth resistor, and a second capacitor;

[0044] One end of the fourth resistor is electrically connected to the other end of the third resistor, and the other end of the fourth resistor is electrically connected to the first end of the control unit 15.

[0045] The fifth resistor and the second capacitor are connected in parallel, and one end of the fifth resistor and one end of the second capacitor are electrically connected between the third resistor and the fourth resistor, and the other end of the fifth resistor and the other end of the second capacitor are grounded.

[0046] Specifically, the fourth resistor R4 is connected in series between the first interface PL Int and the collector of the transistor Q1, which can prevent the current from being too large, thereby protecting the I / O port of the MCU from the impact of large current and avoiding direct damage to the MCU due to the high potential of the collector of the transistor Q1. In addition, the fourth resistor R4 connected in the circuit can also function as filtering and stabilizing the signal, which can smooth out some high-frequency noise and interference signals, making the sub-pack in-place signal received by the MCU more stable and reliable. The fifth resistor R5 and the second capacitor C2 connected in parallel can form an RL filter circuit to achieve voltage stabilizing and filtering, thereby ensuring the stability of the circuit voltage.

[0047] In the embodiment, the first voltage stabilizing and filtering unit 12 is formed based on the fourth resistor R4, the fifth resistor R5 and the second capacitor C2, which can stabilize and filter the voltage on the branch where the first interface PL Int is located, protect the I / O port of the MCU from the impact of large current, avoid direct damage to the MCU due to the high potential of the collector of the transistor Q1, and smooth out high-frequency noise and interference signals, so that the voltage of the first interface PL Int is more stable and reliable.

[0048] In some optional embodiments, in combination with Figure 2 As shown, the voltage dividing unit includes a diode, the negative electrode of the diode is the first end of the voltage dividing unit 13, the first end of the voltage dividing unit 13 is electrically connected to the interface end of the sub-pack, the positive electrode of the diode is the second end of the voltage dividing unit 13, and the second end of the voltage dividing unit 13 is electrically connected to the voltage collecting unit 14.

[0049] The voltage dividing unit can be a diode, or an electronic component or combination capable of realizing the voltage dividing function of the circuit. In the embodiment, the diode D1 can include a Zener diode, a Schottky diode, a voltage stabilizing diode, a silicon diode, a germanium diode, etc., which can be used for one-way conduction of the circuit to prevent reverse current from causing interference or damage to the circuit. In addition, after the sub-pack 2 is connected to the main battery pack 1, a voltage is generated in the in-place detection circuit, and a 0.3V voltage drop is generated on the diode D1, which performs voltage dividing. The generated voltage drop can be used to adjust the voltage level in the circuit.

[0050] Further, based on the 0.7V voltage drop generated by the transistor Q1 in the loop and the 0.3V voltage drop generated by the diode D1 caused by the connection of the sub-pack 2 to the main battery pack 1, the voltage U sampled by the voltage collecting unit 14 is the voltage drop to ground after the sub-pack 2 is connected to the main battery pack 1 plus the 0.3V voltage drop of the diode D1, which is specifically shown in the following formula (1):

[0051]

[0052] Wherein, U is the voltage collected by the voltage collecting unit 14, VDD is the 3.3V provided by the power supply, and n is the number of sub-packs connected.

[0053] According to the voltage VDD provided by the power supply, the voltage U sampled by the voltage collecting unit 14 and the voltage drops generated by the transistor Q1 and the diode D1, the number n of sub-packs 2 connected can be calculated according to the above formula (1). In some examples, the signal collecting unit receives a voltage of 1.45V, and it is calculated that one sub-pack 2 is connected, i.e. the in-place detection resistor R7 is connected to the main battery pack 1; when the signal collecting unit receives a voltage of 1.07V, it is calculated that two sub-packs 2 are connected, i.e. the in-place detection resistors R7 and R8 are connected to the main battery pack 1 in parallel.

[0054] In some examples, when the access number of the sub-pack 2 exceeds the preset sub-pack access number threshold, the detection value of the second interface PL_ADC of the control unit 15 will abnormally change, for example, a voltage mutation occurs. In this case, the main battery pack 1 will send a preset signal to the control unit 15 to inform the control unit 15 that the sub-pack 2 is abnormally accessed, and then the control unit 15 controls the sub-pack 2 to power off, avoiding the problem of exceeding the product definition parallel number, preventing the problem of excessive number of sub-packs 2 accessing causing the sub-pack 2 to be unable to be recognized and thus continuously being awakened by the main battery pack 1, and the problem of the sub-pack 2 being consumed, thereby improving the safety and reliability of the energy storage system.

[0055] In some optional embodiments, in combination with Figure 1 As shown in the figure, the in-place detection circuit further includes a second voltage stabilizing and filtering unit 16.

[0056] The first end of the second voltage stabilizing and filtering unit 16 is electrically connected to the first end of the voltage dividing unit 13 and the interface end of the sub-pack 2, respectively, and the second end of the second voltage stabilizing and filtering unit 16 is grounded.

[0057] In this embodiment, the second voltage stabilizing and filtering unit 16 is electrically connected to the first end of the voltage dividing unit 13 and the interface end of the sub-pack 2, when one or more sub-packs 2 access the main battery pack 1, the voltage in the detection circuit will change rapidly, therefore, the second voltage stabilizing and filtering unit 16 can be used to realize voltage stabilizing and filtering, smooth out high-frequency noise and interference signals, and improve the anti-interference ability of the circuit.

[0058] In some optional embodiments, in combination with Figure 2 As shown in the figure, the second voltage stabilizing and filtering unit 16 includes a third capacitor, one end of the third capacitor is electrically connected to the first end of the voltage dividing unit 13 and the interface end of the sub-pack, and the other end of the third capacitor is grounded.

[0059] Specifically, the second voltage stabilizing and filtering unit 16 can include only a capacitor, or can include a capacitor and a resistor, or can be other electronic components. In this embodiment, the second voltage stabilizing and filtering unit 16 includes a third capacitor C3, when one or more sub-packs 2 access the main battery pack 1, the voltage in the circuit will change rapidly, one end of the third capacitor C3 is electrically connected to the negative electrode of the diode D1 and the interface end of the sub-pack 2, and the other end is grounded, and the third capacitor C3 can be used to realize voltage stabilizing and filtering, smooth out high-frequency noise and interference signals, and improve the anti-interference ability of the circuit.

[0060] In some optional embodiments, in combination with Figure 1 As shown in the figure, the in-place detection circuit further includes a third voltage stabilizing and filtering unit 17.

[0061] The first end of the third voltage stabilizing and filtering unit 17 is electrically connected to the control unit 15 and the first end of the switch control unit 11, respectively, and the second end of the third voltage stabilizing and filtering unit 17 is grounded.

[0062] In the embodiment, one end of the third voltage stabilizing and filtering unit 17 is electrically connected to the first end of the control unit 15 and the switch control unit 11 respectively, and the other end is grounded. When the voltage collecting unit 14 collects the voltage, the collected voltage can be stabilized and filtered, so that the sampled voltage is more stable and reliable, thereby inputting the stable voltage to the control unit 15, which is convenient for the control unit 15 to more accurately identify the access number of the secondary pack 2. In particular, when the access number of the secondary pack 2 exceeds the preset secondary pack access number threshold, the secondary pack 2 is powered off in time through the control unit 15, avoiding the problem of using more parallel machines than the product definition, preventing the problem of the secondary pack being unable to identify due to the access of the excessive number of secondary packs 2, so that the secondary pack is continuously awakened by the main battery pack 1, and the problem of the secondary pack being consumed, thereby improving the safety and reliability of the energy storage system.

[0063] In some optional embodiments, in combination with Figure 2 As shown, the third voltage stabilizing and filtering unit 17 includes a sixth resistor and a fourth capacitor;

[0064] One end of the sixth resistor is electrically connected to the second end of the control unit 15, and the other end of the sixth resistor is electrically connected between the second resistor and the voltage dividing unit 13;

[0065] One end of the fourth capacitor is electrically connected between the second end of the control unit 15 and the sixth resistor, and the other end of the fourth capacitor is grounded.

[0066] Specifically, one end of the sixth resistor R6 is electrically connected to the second interface PL_ADC of the control unit 15, the other end is electrically connected between the second resistor R2 and the anode of the diode D1 in the switch control unit 11, and one end of the fourth capacitor C4 is electrically connected between the second end of the control unit 15 and the sixth resistor R6, and the other end is grounded, which can form an RC filtering unit, improve the stability of the voltage sampled by the voltage collecting unit 14, ensure that the voltage received by the second interface PL_ADC is more stable and accurate, and thereby facilitate the control unit 15 to more accurately determine the number of currently accessed secondary packs.

[0067] In some optional embodiments, in combination with Figure 2 As shown, the in-place detection circuit further includes a grounding unit 18;

[0068] One end of the grounding unit 18 is electrically connected to the other interface end of the secondary pack, and the second end of the grounding unit 18 is grounded. When the one interface end of the secondary pack is electrically connected to the first end of the voltage dividing unit 13, and the other interface end of the secondary pack is electrically connected to the first end of the grounding unit 18, the secondary pack and the in-place detection circuit form a detection loop.

[0069] In the embodiment, by electrically connecting one end of the grounding unit 18 to the other interface end of the sub-pack, the second end of the grounding unit 18 is grounded, so that when the one interface end of the sub-pack is electrically connected to the negative electrode of the diode D1 and the other interface end of the sub-pack is electrically connected to the first end of the grounding unit 18, the sub-pack and the in-place detection circuit form a detection loop, and based on the formed complete detection loop, it is ensured that the current can flow in the closed path, thereby realizing the functions of the in-place detection circuit, including the conduction of the triode Q1, the voltage sampling of the voltage sampling unit 14, the sub-pack access identification of the control unit 15, and the sub-pack access quantity identification.

[0070] It should be noted that the types and sizes of the components in the above circuit are not uniquely limited in the embodiment and can be selected according to actual needs.

[0071] In combination with Figure 3 It is shown that according to another aspect of the embodiment of the present application, an embodiment of an energy storage power supply system is also provided. Figure 3 An optional structure schematic diagram of an energy storage power supply system provided by the embodiment of the present application. The energy storage power supply system comprises:

[0072] The main battery pack 1 and the sub-pack 2, the main battery pack 1 comprises the in-place detection circuit in any of the above embodiments;

[0073] The sub-pack 2 comprises an in-place detection resistor, one end of the in-place detection resistor is electrically connected to the first end of the voltage dividing unit 13 in the main battery pack 1, when the main battery pack 1 comprises the grounding unit 18, the second end of the in-place detection resistor is electrically connected to the first end of the grounding unit 18, and when the battery pack does not comprise the grounding unit 18, the other end of the in-place detection resistor is grounded.

[0074] In the embodiment, in the energy storage power supply system, the battery pack is usually divided into a main battery pack and a slave pack, and the two are usually used in parallel. The above in-place detection can refer to detecting whether the sub-pack connected in parallel is in place. By parallel in-place detection, the number of sub-packs connected is judged, and abnormal conditions in the battery pack can be found and handled in time, thereby ensuring the overall performance and safety of the battery pack.

[0075] Specifically, when the sub-pack 2 is connected to the main battery pack 1, the first end of the voltage dividing unit 13 in the main battery pack 1 is electrically connected to the in-place detection resistor in the connected sub-pack 2, when the main battery pack 1 comprises the grounding unit 18, the second end of the in-place detection resistor is electrically connected to the first end of the grounding unit 18, and when the battery pack does not comprise the grounding unit 18, the other end of the in-place detection resistor is grounded, so that after the sub-pack is connected to the main battery pack 1, a complete detection loop is formed.

[0076] The main battery pack 1 can be a main control battery pack, which is a battery control core of the system and can supply power to the system. In addition, the main battery pack 1 can coordinate the work of multiple secondary battery packs 2 according to the power supply demand. In this embodiment, two secondary battery packs are connected as an example. The main battery pack 1 can include a main pack parallel port and an in-place detection ground (or a grounding unit 18). The main pack parallel port is used to electrically connect the in-place detection 1 of the two secondary battery packs, and the in-place detection ground is used to electrically connect the in-place detection 2 of the two secondary battery packs, so as to form a complete control loop among the control unit 15, the main battery pack 1, and the secondary battery pack 2.

[0077] The secondary battery pack 2 can be a power-on pack, which, under the coordination of the main battery pack 1, can provide energy to the system together. When the power supply demand increases, the system energy can be increased by increasing the access of the secondary battery pack 2. When the power supply demand decreases, the system energy can be reduced by reducing the access of the secondary battery pack 2, thereby reducing the power supply loss. Each secondary battery pack 2 can have different capacity batteries, for example, a 5.1KΩ in-place detection resistor. Each secondary battery pack 2 can include an in-place detection resistor, such as Figure 1 the in-place detection resistors R7 and R8 in FIG. 6, and Figure 2 the in-place detection resistor 1 and the in-place detection resistor 2 in FIG. 7.

[0078] In some examples, when multiple in-place detection resistors are connected, the in-place detection resistors are connected in parallel. The voltage acquisition unit 14 in the main battery pack 1 can identify the number of secondary battery packs 2 connected in parallel through the voltage on the acquisition port. In addition, the parallel connection of the secondary battery packs 2 can make each battery in the secondary battery pack 2 provide current to the load. Even if a secondary battery pack 2 fails or its performance decreases, the other secondary battery packs 2 can still work to ensure the normal operation of the entire battery pack, improve the reliability and safety of the system, and reduce the risk of failure of the entire system due to the failure of a single battery pack.

[0079] In this embodiment, the energy storage power supply system includes the in-place detection circuit of the battery pack provided in the above embodiments, and thus the above embodiments and the corresponding technical effects can be achieved, which will not be described here.

[0080] It should be noted that, in the present document, relational terms such as first and second, and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process or method that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process or method. Items under "including" or "having" are not meant to be open-ended including any and all subsequent similar terms or items.

[0081] It should be understood that the same or similar reference signs in the drawings of the embodiments represent the same or similar parts; in the description of the present application, if the orientation or position relationship indicated by the terms "upper", "lower", "left", "right" and the like is based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the position relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present application, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. The components in the circuit in the embodiments can be electrically connected.

[0082] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described or recorded in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0083] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. An in-situ detection circuit for a battery pack, the in-situ detection circuit comprising: The application is applied to a main battery pack in an energy storage power supply system, the main battery pack is used for electrical connection with a sub-pack in the energy storage power supply system, and the in-situ detection circuit comprises a switch control unit, a first voltage stabilizing and filtering unit, a voltage dividing unit, a voltage collecting unit and a control unit. The first end of the voltage dividing unit is electrically connected to the interface end of the sub-pack, the second end of the voltage dividing unit is electrically connected to the first end of the switch control unit and the first end of the voltage collecting unit, the first end of the voltage collecting unit is electrically connected to the first end of the switch control unit, the second end of the voltage collecting unit is electrically connected to the control unit, the second end of the switch control unit is electrically connected to the first end of the first voltage stabilizing and filtering unit, the second end of the first voltage stabilizing and filtering unit is electrically connected to the control unit, and the second end of the switch control unit is also electrically connected to a power supply. When the interface end of the sub-pack is connected to the first end of the voltage dividing unit, the sub-pack and the in-situ detection circuit form a detection loop, so that the switch control unit is turned on, the control unit confirms that the sub-pack is connected, and the number of the connected sub-packs is determined according to the voltage collected by the voltage collecting unit.

2. The in-situ detection circuit of claim 1, wherein, The in-situ detection circuit further comprises a second voltage stabilizing and filtering unit. The first end of the second voltage stabilizing and filtering unit is electrically connected to the first end of the voltage dividing unit and the interface end of the sub-pack, and the second end of the second voltage stabilizing and filtering unit is grounded.

3. The in-situ detection circuit of claim 1, wherein, The in-situ detection circuit further comprises a third voltage stabilizing and filtering unit. The first end of the third voltage stabilizing and filtering unit is electrically connected to the control unit and the first end of the switch control unit, and the second end of the third voltage stabilizing and filtering unit is grounded.

4. The in-situ detection circuit of claim 3, wherein, The switch control unit comprises a triode, a first resistor, a second resistor, a third resistor and a first capacitor. The collector of the triode is electrically connected to one end of the third resistor, the emitter of the triode is electrically connected to the power supply, and the base of the triode is electrically connected to one end of the second resistor. The first resistor is electrically connected between the base and the emitter of the triode, one end of the first capacitor is electrically connected to the power supply, the other end of the first capacitor is grounded, and the other end of the third resistor is electrically connected to the first end of the first voltage stabilizing and filtering unit.

5. The in-situ detection circuit of claim 4, wherein, The first voltage stabilizing and filtering unit comprises a fourth resistor, a fifth resistor and a second capacitor. One end of the fourth resistor is electrically connected to the other end of the third resistor, and the other end of the fourth resistor is electrically connected to the first end of the control unit. The fifth resistor and the second capacitor are connected in parallel, one end of the fifth resistor and the second capacitor is electrically connected between the third resistor and the fourth resistor, and the other end of the fifth resistor and the second capacitor is grounded.

6. The in-situ detection circuit of claim 2, wherein, The second voltage stabilizing and filtering unit comprises a third capacitor, one end of the third capacitor is electrically connected to the first end of the voltage dividing unit and the interface end of the sub-pack, and the other end of the third capacitor is grounded.

7. The in-situ detection circuit of claim 4, wherein, The third voltage stabilizing and filtering unit comprises a sixth resistor and a fourth capacitor. One end of the sixth resistor is electrically connected to the second end of the control unit, and the other end of the sixth resistor is electrically connected between the second resistor and the voltage dividing unit. One end of the fourth capacitor is electrically connected between the second end of the control unit and the sixth resistor, and the other end of the fourth capacitor is grounded.

8. The in-situ detection circuit of claim 1, wherein, The voltage dividing unit comprises a diode, a negative electrode of the diode serving as a first end of the voltage dividing unit, the first end of the voltage dividing unit being electrically connected to an interface end of the sub battery pack, and a positive electrode of the diode serving as a second end of the voltage dividing unit, the second end of the voltage dividing unit being electrically connected to the voltage collecting unit.

9. The in-situ detection circuit of claim 1, wherein, The ground unit is further included; One end of the ground unit is electrically connected to another interface end of the sub battery pack, and the second end of the ground unit is grounded, when one interface end of the sub battery pack is electrically connected to the first end of the voltage dividing unit and the other interface end of the sub battery pack is electrically connected to the first end of the ground unit, the sub battery pack and the in-place detection circuit form a detection loop.

10. An energy storage power system, characterized by, The energy storage power supply system comprises a main battery pack and a sub battery pack, and the main battery pack comprises the in-place detection circuit according to any one of claims 1 to 9; The sub battery pack comprises an in-place detection resistor, one end of the in-place detection resistor being electrically connected to the first end of the voltage dividing unit in the main battery pack, when the main battery pack comprises the ground unit, the second end of the in-place detection resistor being electrically connected to the first end of the ground unit, and when the battery pack does not comprise the ground unit, the other end of the in-place detection resistor is grounded.

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