Battery pack connection system, method, device and energy storage system

Abstract

The present application relates to a battery pack connection system, method, device, and energy storage system. The battery pack connection system includes: a host, a first switch unit, a battery pack, and a DC charging and discharging device, wherein the first switch unit is arranged between the host's identification line and the battery pack's identification line; the DC charging and discharging device includes: a second switch unit and a first isolation unit; the first end of the second switch unit is connected to the battery pack's identification line, and the second end of the second switch unit is connected to the first isolation unit; the first isolation unit is configured to output a first indication signal based on the switching state of the second switch unit; wherein the first indication signal is used to determine whether the host is connected to the battery pack and / or whether the battery pack is connected to the DC charging and discharging device. The present application can expand the use scenarios of the battery pack and enhance the user experience.

Description

Technical Field

[0001] The present application relates to the field of energy storage power supply technology, and in particular to a battery pack connection system, method, device and energy storage system. Background Art

[0002] The battery pack currently uses the positive identification line (REG+) and negative identification line (REG-) as well as the latch status to determine its connection status with the host. When REG+ and REG- are shorted and the latch is closed, the battery pack detects a high-level signal. After detecting a high-level signal, the battery pack confirms that it is connected to the host and can perform a pre-charge to allow the battery pack to power the host. After the pre-charge is successful and communication between the battery pack and the host is established, the battery pack closes the main metal-oxide-semiconductor field-effect transistor (MOS) to power the host through the power line.

[0003] In the existing technology, battery packs can only support users to charge and discharge with a single host. This results in some users who only purchase battery packs but not the matching host being unable to charge and discharge the battery pack, limiting the usage scenarios of the battery pack and user experience. Summary of the Invention

[0004] Based on this, it is necessary to provide a battery pack connection system, method, device and energy storage system that can increase the usage scenarios of battery packs and improve user experience in response to the above technical problems.

[0005] In a first aspect, the present application provides a battery pack connection system, comprising:

[0006] A host, a first switch unit, a battery pack, and a DC charging and discharging device, wherein the first switch unit is arranged between an identification line of the host and an identification line of the battery pack;

[0007] The DC charging and discharging device includes: a second switch unit and a first isolation unit; a first end of the second switch unit is connected to the identification line of the battery pack, and a second end of the second switch unit is connected to the first isolation unit; the first isolation unit is configured to output a first indication signal based on the switching state of the second switch unit;

[0008] The first indication signal is used to determine whether the host is connected to the battery pack, and / or whether the battery pack is connected to the DC charging and discharging device.

[0009] In a second aspect, the present application further provides a battery pack connection identification method, which is applied to the system as described in the first aspect, comprising:

[0010] obtaining a first indication signal output by the first isolation unit;

[0011] According to the first indication signal, it is determined that the host is connected to the battery pack, and / or that the battery pack is connected to the DC charging and discharging device.

[0012] In a third aspect, the present application also provides an energy storage system, including the system as described in the first aspect.

[0013] In a fourth aspect, the present application also provides a battery pack connection identification device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method described in the second aspect when executing the computer program.

[0014] In a fifth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in the second aspect.

[0015] In a sixth aspect, the present application further provides a computer program product, comprising a computer program, which, when executed by a processor, implements the steps of the method described in the second aspect.

[0016] The battery pack connection system includes: a host, a first switch unit, a battery pack, and a DC charging and discharging device. The first switch unit is arranged between the host's identification line and the battery pack's identification line. The DC charging and discharging device includes: a second switch unit and a first isolation unit. The first end of the second switch unit is connected to the battery pack's identification line, and the second end of the second switch unit is connected to the first isolation unit. The first isolation unit is used to output a first indication signal based on the switching state of the second switch unit. The first indication signal is used to determine whether the host is connected to the battery pack and / or whether the battery pack is connected to the DC charging and discharging device. This solution, by providing the first switch unit, the second switch unit, the related identification line, and the first isolation unit, enables the battery pack to clearly and effectively determine its connection with the host and the DC charging and discharging device. In this way, the battery pack can be stably connected to the host to power it to ensure the normal operation of the equipment, and can also be conveniently connected to the DC charging and discharging equipment for charging or external discharge operations, expanding the application of the battery pack in different functional requirements scenarios. For example, when working outdoors, you can connect the DC charging and discharging equipment to use the battery pack to power other electrical equipment, and when using conventional equipment, it can normally power the host, thereby increasing the overall use scenario range of the battery pack and improving the user experience.

[0017] For example, for some portable power tools, when there is no mains power access at the construction site, the battery pack can be connected to the corresponding DC charging and discharging equipment through this connection system, and then the DC charging and discharging equipment can be connected to other tools that require electricity, such as lighting fixtures, so that the battery pack can serve as a temporary power source and realize more diverse functional application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of a battery pack connection system in one embodiment Figure 1 ;

[0020] Figure 2 A schematic diagram of a battery pack connection system in one embodiment Figure 2 ;

[0021] Figure 3 A schematic diagram of a battery pack connection system in one embodiment Figure 1 ;

[0022] Figure 4 A schematic diagram of a battery pack connection system in one embodiment Figure 2 ;

[0023] Figure 5 A schematic diagram of a battery pack connection system in one embodiment Figure 3 ;

[0024] Figure 6 A schematic diagram of a battery pack connection system in one embodiment Figure 3 ;

[0025] Figure 7 A schematic diagram of a battery pack connection system in one embodiment Figure 4 ;

[0026] Figure 8 A schematic diagram of a battery pack connection system in one embodiment Figure 4 ;

[0027] Figure 9 A schematic diagram of a battery pack connection system in one embodiment Figure 5 ;

[0028] Figure 10 A status diagram of a battery pack connection system Figure 6 ;

[0029] Figure 11 Schematic diagram of a flow chart of a battery pack connection method in one embodiment. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0031] As an energy storage device that provides power to devices, battery packs are widely used in modern electronic devices and power tools. They contain multiple battery cells, and a complex system design and management system ensures stable power output and safe use. The battery pack structure typically includes a casing, a cell group, a protection system, and interfaces for connecting to external devices. These interfaces include power cables for transmitting power and identification cables for communicating with external devices and identifying connection status. Among the many battery pack designs, the design of identification cables and connection devices is crucial to the realization of battery pack functions and the expansion of usage scenarios. They directly affect the interaction and adaptability between the battery pack and different devices.

[0032] The battery pack currently determines its connection status to the host computer through two identification lines: the positive identification line (REG+) and the negative identification line (REG-), as well as the status of the switches configured on these lines. When REG+ and REG- are short-circuited and the switches are closed, the battery pack detects a high-level signal. After detecting a high-level signal and confirming a connection to the host computer, the battery pack can perform a pre-charge to power the host computer. Once the pre-charge is successful and communication between the battery pack and the host computer is established, the battery pack closes its main metal-oxide semiconductor field-effect transistor (MOS) to power the host computer via the power line.

[0033] In the existing technology, battery packs can only support users to charge and discharge with a single host. This results in some users who only purchase battery packs but not the matching host being unable to charge and discharge the battery pack, limiting the usage scenarios of the battery pack and user experience.

[0034] In an embodiment of the present application, a battery pack connection system and a battery pack connection identification method are provided, which can increase the usage scenarios of the battery pack and enhance the user experience.

[0035] In an exemplary embodiment, Figure 1 As shown, a schematic diagram of a battery pack connection system is provided. Figure 1 , the system comprises:

[0036] The host 11 , the first switch unit 12 , the battery pack 13 and the DC charging and discharging device 14 , wherein the first switch unit 12 is arranged between the identification line of the host 10 and the identification line of the battery pack 13 .

[0037] The above-mentioned DC charging and discharging device 14 includes: a second switch unit 141 and a first isolation unit 142; the first end of the second switch unit 141 is connected to the identification line of the battery pack 13, and the second end of the second switch unit 141 is connected to the first isolation unit 142; the first isolation unit 142 is used to output a first indication signal based on the switching state of the second switch unit 141, and the first indication signal is used to determine whether the host 11 is connected to the battery pack 13, and / or whether the battery pack 13 is connected to the DC charging and discharging device 14.

[0038] The first switch unit 12 and the second switch unit 141 may both be snap-fit ​​devices. The first isolation unit 142 may be an optical coupler.

[0039] In the embodiment of the present application, the first indication signal includes: a first valid signal or a first invalid signal. The valid signal may be a high-level signal, and the invalid signal may be a low-level signal.

[0040] The above outputs the first valid signal, namely Figure 1 LOCK2 in is a high level signal, and the above output is the first invalid signal, that is, Figure 1 LOCK2 in is a low level signal.

[0041] It should be noted that Figure 1 This is just a simplified system diagram. Figure 1 The grounding condition is not shown in the figure, and the specific grounding condition can be set according to actual needs.

[0042] In the above system, by providing a first switch unit, a second switch unit, and related identification lines and a first isolation unit, the battery pack can clearly and effectively determine its connection with the host and the DC charging and discharging device. In this way, the battery pack can be stably connected to the host to power it to ensure the normal operation of the device, and can also be conveniently connected to the DC charging and discharging device for charging or external discharge operations, expanding the application of the battery pack in different functional demand scenarios. For example, when working outdoors, the battery pack can be connected to the DC charging and discharging device to power other electrical devices, while it can normally power the host when conventional equipment is in use, thereby increasing the overall use scenario range of the battery pack and improving the user experience.

[0043] In some embodiments, the above Figure 1In the system shown, the first isolation unit 142 is configured to output a first valid signal when the second switch unit 141 is closed, and output a first invalid signal when the second switch unit 141 is open.

[0044] For example, Figure 2 As shown, a schematic diagram of a battery pack connection system is provided. Figure 2 ,exist Figure 2 The above Figure 1 The first switch unit 12 in the embodiment can be specifically a buckle 1 (ie SW2). Figure 2 The DC charging and discharging device 14 is represented as DCHub. Figure 1 The second switch unit 141 in Figure 2 SW2 in the DC Hub, above Figure 1 The first isolation unit 142 is Figure 2 The first optocoupler U2 of the DC Hub.

[0045] like Figure 2 As shown in , the battery pack 13 may specifically include: a first diode D1, a third optocoupler U1, a first resistor R1 and a seventh resistor R7.

[0046] exist Figure 2 In the figure, SW1 and SW2 each include 4 pins, which are marked as 1, 2, 3 and 4 respectively in the figure. Figure 2 In the first optocoupler U2 and the third optocoupler U1, Cathode represents the cathode of the optocoupler, that is, pin 2; Anode represents the anode of the optocoupler, that is, pin 1; Collector represents the collector of the optocoupler, that is, pin 4; Emitter represents the emitter of the optocoupler, that is, pin 3. Figure 2 GND_COM in the figure indicates the common ground terminal, and GND1 and GND2 both indicate the ground terminals. Figure 2 In the figure, +12V_COM indicates a positive 12 volt DC power supply, and +3V3 indicates a positive 3.3 volt DC power supply.

[0047] like Figure 2 As shown, the first terminal of SW2 (i.e. Figure 2 The 4th pin of SW in the middle) is connected to the positive identification line (REG+) and the negative identification line (REG-) of the battery pack 13, and is connected to the ground terminal through the negative identification line. The second end of SW2 (i.e. Figure 2 Pin 2 of SW in the circuit) is connected to the cathode of the first optocoupler U2; the first optocoupler U2 is used to output the first valid signal at the emitter of the first optocoupler U2 when SW2 is closed, that is, Figure 2 LOCK2 shown in is a high level signal. When SW2 is disconnected, the emitter of the first optocoupler U2 outputs a first invalid signal, that is, Figure 2LOCK2 shown in FIG is a low level signal.

[0048] like Figure 2 As shown, the system also includes a first diode D1 and a second diode D2. The anode of the first diode D1 (i.e., pin 1 of D1) is connected to the cathode of the third optocoupler U1 (i.e., pin 2 of U1), and the cathode of the first diode D1 (i.e., pin 2 of D1) is connected to the positive identification line (REG+). The anode of the second diode D2 (i.e., pin 1 of D2) is connected to the cathode of the first optocoupler U2 (i.e., pin 2 of U2), and the cathode of the second diode D2 (i.e., pin 2 of D2) is connected to the second end of SW2 (i.e., pin 2 of SW2). These first and second diodes D1 and D2 can be used to isolate signals and prevent reverse current interference.

[0049] like Figure 2 As shown, the system further includes: a first resistor R1, a second resistor R2, a seventh resistor R7, and an eighth resistor R8. The resistors in the embodiment of the present application can play a role in current limiting.

[0050] above Figure 2 In the system shown, by controlling the states of SW1 and SW2, the outputs LOCK1 and LOCK2 can be controlled, and Figure 2 The connection status between the battery pack 13 and the host 11, and / or the connection status between the battery pack 13 and the DC charging and discharging device 14 can be represented by the switch status of SW1 and LOCK2.

[0051] Among them, when the switch state of SW1 is closed, the battery pack 13 is connected to the host 11, and when the switch state of SW1 is disconnected, the battery pack 13 is disconnected from the host 11; when the LOCK2 is a high-level signal, the battery pack 13 is connected to the DC charging and discharging device 14, and when the LOCK2 is a low-level signal, the battery pack 13 is disconnected from the DC charging and discharging device 14.

[0052] For example, the situations in different states of SW1 and SW2 are described below with reference to the accompanying drawings.

[0053] (1.1) SW1 is closed and SW2 is open.

[0054] For example, in Figure 2 On the basis of Figure 3 A status diagram of a battery pack connection system Figure 1 ,Should Figure 3The figure shows the state of the battery pack connected to the system when SW1 is closed and SW2 is open. Since SW2 is open, the blocked DC Hub circuit is disconnected from the battery pack 13, and the first optocoupler U2 is inoperative. At this time, LOCK2 is a low-level signal. Since SW1 is closed, the host 11 is connected to the battery pack 13, and the third optocoupler U1 in the battery pack 13 is operational. LOCK1 is a high-level signal. A control unit may be provided in the battery pack 13, and the control unit may be connected to the third optocoupler U1. After receiving the high-level signal, the control unit may confirm that the host 11 has been connected to the battery pack 13. At this time, the control unit controls the battery pack 13 to pre-charge the host 11. After the pre-charge is successful and communication is established between the battery pack 13 and the host 11, the control unit in the battery pack 13 may close the main MOS to enable the battery pack 13 to charge and discharge. For example, the battery pack 13 can supply power to the host 11 from the power line.

[0055] (1.2) SW1 is disconnected, SW2 is disconnected.

[0056] For example, in Figure 2 On the basis of Figure 4 A status diagram of a battery pack connection system Figure 2 ,Should Figure 4 The figure shows the state of the battery pack 13 connected to the system when SW1 and SW2 are disconnected. Since SW1 and SW2 are disconnected, the blocked part of the circuit is not connected to the battery pack. At this time, the third optocoupler U1 is grounded through the DC Hub, so the third optocoupler U1 is working, LOCK1 is a high-level signal, and the battery pack 13 automatically performs pre-charge output. However, SW2 on the DC Hub side is disconnected, the first optocoupler U2 is not working and cannot be turned on, LOCK 2 is a low-level signal, the rear DC Hub cannot be started, and cannot communicate with the battery pack 13. Therefore, the battery pack 13 will not close the MOS, and therefore will not be charged or discharged through the power line. At this time, neither the host 11 nor the DC Hub is powered.

[0057] (1.3) SW1 is open and SW2 is closed.

[0058] For example, in Figure 2 On the basis of Figure 5 A status diagram of a battery pack connection system Figure 3 , Figure 5 The figure shows the status of the battery pack connected to the system when SW1 is open and SW2 is closed. Figure 5 , SW1 is disconnected, Figure 5The obscured portion of the host 11 circuit is not connected to the battery pack 13. The third optocoupler U1 is grounded through the DC Hub, so it operates and LOCK1 is a high-level signal. The battery pack 13 is connected to the DC Hub via a cable and is directly grounded through the DC Hub, automatically pre-charging the output. Because SW2 is closed, the first optocoupler U2 operates, LOCK 2 is a high-level signal, and the DC Hub starts up after power is applied. The battery pack 13 successfully communicates with the DC Hub, closing the main MOS and being controlled by the DC Hub for charging and discharging.

[0059] (1.4) SW1 is closed, SW2 is closed.

[0060] For example, by closing SW1 and SW2 simultaneously, the third optocoupler U1 in the battery pack 13 and the first optocoupler U2 in the DC Hub are both active, and both LOCK 1 and LOCK 2 are high-level signals. The battery pack 13 confirms that both the DC Hub and the host 11 are connected, and pre-charging of the DC Hub and host 11 can now begin. The battery pack 13's normal output provides power to the host 11, and the DC Hub is powered on. Once pre-charging is successful and communication is established between the host 11, the battery pack 13, and the DC Hub, the host 11 can identify the connection status through broadcast communication, and the host 11 will coordinate the charging and discharging of the entire system.

[0061] In the above-mentioned situation where SW1 and SW2 are closed at the same time, the three devices, host 11, battery pack 13 and DC Hub, are all in the battery pack connection system, and are connected and communicated normally. Among them, the host 11 is the master device, and the battery pack 13 and DC Hub are slave devices. The battery pack 13 and DC Hub can be charged and discharged according to the instructions of the host 11.

[0062] During the communication process between the host 12 and the DC Hub, the host 12 needs to broadcast a message to the DC Hub first. The DC Hub responds after receiving the broadcast message. After the host 12 confirms that both the DC Hub and the battery pack 13 exist in the system, the host 12 coordinates the charging and discharging of the battery pack 13 and the DC Hub.

[0063] It should be noted that the above-mentioned LOCK 1 can be an indication signal for the pre-charging action. For example, when the above-mentioned LOCK1 is a high-level signal, the battery pack performs the pre-charging action at this time; when the above-mentioned LOCK 1 is a low-level signal, the battery pack does not perform the pre-charging action at this time. Thereafter, attention is paid to whether the host is connected to the battery pack, and / or whether the battery pack is connected to the DC Hub. If the host is connected to the battery pack, or the DC Hub is connected to the battery pack, then the pre-charging action has a direct object of action. At this time, the host or DC Hub can be powered on smoothly and communicate with the battery pack, thereby ensuring the normal operation and coordinated work of the entire system.

[0064] The battery pack connection system shown in Figure 2 achieves effective control of the connection status between the battery pack 13 and the host 11 and the DC charging and discharging device (DC Hub) through a specific circuit design (including SW1, SW2, optocouplers, diodes and other components). Specifically, by controlling the switch state of SW1 and the LOCK2 signal, different states have different effects, expanding the use scenarios of the battery pack.

[0065] exist Figure 1 On the basis of Figure 6 A schematic diagram of a battery pack connection system is also provided. Figure 3 , Figure 6 In the embodiment, the DC charging and discharging device 14 (ie, DC Hub) further includes: a second isolation unit 143 , a first voltage regulator tube DZ1 , and a second voltage regulator tube DZ2 .

[0066] The first end of the second switch unit 141 is connected to the positive identification line (REG+) of the battery pack 13, and the second end of the second switch unit 141 is connected to the anode of the first voltage-stabilizing tube DZ1 and the cathode of the second voltage-stabilizing tube DZ2; the cathode of the first voltage-stabilizing tube DZ1 is connected to the first isolation unit 142; the anode of the second voltage-stabilizing tube DZ2 is connected to the second isolation unit 143, and the second isolation unit 143 is connected to the negative identification line (REG-) of the battery pack and is connected to the ground terminal through the negative identification line.

[0067] The second isolation unit 143 is configured to output a third indication signal based on the switching states of the first switching unit and the second switching unit;

[0068] The first indication signal and the third indication signal are used to determine whether the host 11 is connected to the battery pack 13 and / or whether the battery pack 13 is connected to the DC charging and discharging device 14 .

[0069] The battery pack 13 is configured to output a second indication signal based on the switching states of the first switch unit 12 and the second switch unit 141 .

[0070] The first indication signal includes: a first valid signal or a first invalid signal; the second indication signal includes: a second valid signal or a second invalid signal; the third indication signal includes: a third valid signal and a third invalid signal.

[0071] The above-mentioned second indication signal may be an indication signal for a pre-charging action. Exemplarily, when the above-mentioned second indication signal is a second valid signal, the battery pack will perform a pre-charging action at this time; when the above-mentioned second indication signal is a second invalid signal, the battery pack will not perform a pre-charging action at this time. Thereafter, based on the first indication signal and the third indication signal, it can be determined whether the host is connected to the battery pack, and / or whether the battery pack is connected to the DC Hub. If the host is connected to the battery pack, or the DC Hub is connected to the battery pack, then the pre-charging action has a direct object of action. At this time, the host or DCHub can be powered on smoothly and communicate with the battery pack, thereby ensuring the normal operation and coordinated work of the entire system.

[0072] Figure 6 When the first switch unit 12 is closed and the second switch unit 141 is open, the battery pack 13 outputs the second valid signal, the first isolation unit 142 outputs the first invalid signal, and the second isolation unit 143 outputs a third invalid signal;

[0073] When the first switch unit 12 is disconnected and the second switch unit 141 is closed, the battery pack 13 outputs the second valid signal; the first isolation unit 142 outputs the first invalid signal, and the second isolation unit 143 outputs a third valid signal;

[0074] When the first switch unit 12 is closed and the second switch unit 141 is closed, the battery pack 13 outputs the second valid signal; the first isolation unit 142 outputs the first valid signal, and the second isolation unit 143 outputs a third invalid signal.

[0075] exist Figure 2 and the above Figure 6 On the basis of Figure 7 As shown, a schematic diagram of a battery pack connection system is provided. Figure 4 .exist Figure 7 middle Figure 6 The second isolation unit 143 in the Figure 7 The second optocoupler U3 in;

[0076] The cathode of the first voltage-stabilizing tube DZ1 is connected to the cathode of the first optical coupler U2;

[0077] The anode of the second voltage regulator tube DZ2 is connected to the anode of the second optocoupler U3 , and the cathode of the second optocoupler U3 is connected to the negative identification line (REG-) of the battery pack 13 , and can be connected to the ground terminal (GND_COM) through the negative identification line.

[0078] in, Figure 7 Battery pack 13 is no longer directly grounded through the DC hub, preventing the issue of automatic pre-charging upon connection. The DC hub can directly confirm the presence of host 11 in the entire system through the LOCK2 signal. If host 11 is present, the DC hub automatically relinquishes its "master" role and becomes a "slave," allowing host 11 to coordinate battery pack output, avoiding control conflicts and improving communication efficiency.

[0079] like Figure 7 As shown, the system further includes: a first resistor R1, a second resistor R2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a twelfth resistor R12, and a fourth resistor R4. The resistors in the embodiment of the present application can play a role in current limiting.

[0080] (2.1) SW1 is closed and SW2 is open.

[0081] exist Figure 7 On the basis of Figure 8 A status diagram of a battery pack connection system Figure 4 .like Figure 8 As shown, the battery pack 13 is connected to the host 11 through a cable. When SW1 is closed, the third optocoupler U1 in the battery pack 13 works, LOCK1 is a high-level signal, and the battery pack 13 confirms that the host 11 is connected for pre-charging. After the battery pack 13 is pre-charged successfully and establishes communication with the host 11, the main MOS can be closed and power can be supplied to the host 11 from the power line. Since SW2 is disconnected, Figure 8 The partially obscured circuitry of the DC charging and discharging device 14 (i.e., the DC Hub) is disconnected from the battery pack 13. The first and second optocouplers U2 and U3 are both inoperative, and LOCK2 and LOCK3 are low-level signals. This situation is similar to the situation (1.1) above.

[0082] (2.2) SW1 is open and SW2 is closed.

[0083] exist Figure 7 On the basis of Figure 9 A status diagram of a battery pack connection system Figure 5The battery pack 13 is connected to the host 11 and the DC Hub via a cable, SW1 is disconnected, and SW2 is closed. At this time, since SW1 is disconnected and closed, the battery pack 13 does not supply power to the host. Figure 9 The blocked portion of the host 11 cannot establish communication with the battery pack 13. In the DC Hub, at this time, since the first voltage regulator DZ1 is connected to the output of the first diode D1 in the battery pack 13, the reverse breakdown condition cannot be met. Therefore, the first voltage regulator DZ1 is cut off and the second voltage regulator DZ2 reversely breaks down, corresponding to Figure 9 The blocked first optocoupler U2 does not work, while the third optocoupler U1 and the second optocoupler U3 work. At this time, LOCK1 is a high-level signal, LOCK2 is a low-level signal, and LOCK3 is a high-level signal. The DC Hub can judge that the battery pack 13 and the host 11 in the system are not connected through the low-level signal of LOCK2. The DC Hub plays the role of "master device" and controls the charging and discharging of the battery pack 13.

[0084] (2.3) SW1 is closed, SW2 is closed.

[0085] exist Figure 7 On the basis of Figure 10 A status diagram of a battery pack connection system Figure 6 When SW1 and SW2 are closed at the same time, the third optocoupler U1 in the battery pack 13 works and LOCK1 is a high-level signal. However, because the 2nd pin of the second voltage regulator DZ2 is short-circuited with GND_COM, the first voltage regulator DZ1 breaks down in reverse and the second voltage regulator DZ2 is cut off, making the DC Hub Figure 10 The blocked second optocoupler U3 does not work, the first optocoupler U2 works, LOCK2 is a high-level signal, and LOCK3 is a low-level signal. When the battery pack 13 confirms that LOCK1 is a high-level signal, it performs pre-charging, and the normal output powers the host 11, and the DC Hub is also powered on and started. The pre-charging is successful and the host 11, battery pack 13, and DC Hub establish communication, and the host 11 powers the DC Hub and starts. At the same time, the DCHub can determine that the battery pack 1 and the host 11 in the system are connected by the high-level signal of LOCK2. At this time, it can report a signal to the host 11 and cooperate with the host 11 for charging and discharging.

[0086] In the embodiments of this application, by adding components such as a second isolation unit 143, a first voltage regulator diode DZ1, and a second voltage regulator diode DZ2 to the DC charging and discharging device 14 (DCHub) in the system shown in Figures 6 and 7, these new components, working in conjunction with existing components (such as the first switch unit 12, the second switch unit 141, and the first isolation unit 142), change the connection status determination and control logic when the battery pack 13 is connected to the DC Hub. This improves the overall issues of pre-charging, power-up, handshake communication, and charging and discharging operations caused by handshake failures or connection state changes, enhances system stability and reliability, and expands the effective application of battery packs in a variety of complex scenarios.

[0087] The present disclosure also provides a battery pack connection identification method, which can be applied to any of the battery pack connection identification systems shown in the above embodiments. The method can be performed by a battery pack connection identification device, which can be at least one of the following:

[0088] 1. The battery management system (BMS) is a key component within the battery pack. It is primarily responsible for monitoring and managing various battery pack statuses, including battery voltage, current, temperature, and other parameters. During the battery pack connection identification process, the BMS can serve as a connection identification device. For example, in the systems shown in Figures 6 and 7, the built-in circuitry and sensors can detect the second indication signal output by the battery pack and the first and third indication signals output by the isolation unit.

[0089] 2. Smart chargers. Some chargers with intelligent features can act as battery pack connection identification devices. When a battery pack is connected to a smart charger (acting as a DC charging and discharging device), the smart charger can detect the connection status. Internal detection circuitry can detect relevant indication signals to determine whether the battery pack is properly connected. If the connection is correct, the smart charger can adjust charging parameters such as charging current and voltage based on the battery pack type and status. Furthermore, the smart charger can communicate with the battery pack's internal BMS or host computer to effectively control the entire charging process.

[0090] 3. The host device's power management module. In a host device (such as a power tool or electronic device), the power management module also serves as a battery pack connection identification device. When the battery pack is connected to the host, the power management module detects the connection signal. It determines whether the battery pack has been successfully connected by receiving indication signals from the battery pack and the isolation unit. If the connection is successful, the power management module controls communication between the host and the battery pack, coordinating the battery pack's power supply to the host to ensure normal operation. During operation, the power management module monitors the battery pack's connection status in real time to address any potential connection anomalies.

[0091] For example, Figure 11 FIG. 1 is a flow chart of a method for identifying a battery pack connection, which may include but is not limited to:

[0092] 1101. Obtain a first indication signal output by a first isolation unit.

[0093] 1102. Determine, based on the first indication signal, whether the host is connected to the battery pack and / or whether the battery pack is connected to a DC charging and discharging device.

[0094] The first indication signal includes: a first valid signal or a first invalid signal.

[0095] In some embodiments, for the above Figure 1 or Figure 2 In the system shown, the above 1102 may include: determining whether the battery pack is connected to the DC charging and discharging device according to the first indication signal; and determining whether the host is connected to the battery pack according to the switching state of the first switching unit.

[0096] When the first indication signal is a first valid signal, the battery pack is determined to be connected to the DC charging and discharging device; when the first indication signal is a first invalid signal, the battery pack is determined to be disconnected from the DC charging and discharging device. When the first switch unit is closed, the host is determined to be connected to the battery pack; when the first switch unit is open, the host is determined to be disconnected from the battery pack.

[0097] The above-mentioned battery pack connection identification method can simply and effectively determine the connection status between the host and the battery pack, and between the battery pack and the DC charging and discharging device by obtaining the switching status of the first switching unit and the first indication signal output by the first isolation unit. Various connection scenarios can be accurately judged. This identification method reduces the complexity of signal acquisition, reduces the processing burden of the system, and makes the judgment of the battery pack connection status fast and accurate. In practical applications, it can quickly provide a reliable basis for subsequent pre-charging, power supply or charging and discharging operations, improve the timeliness and stability of the interaction between the battery pack and the host, and the DC charging and discharging device, ensure that the battery pack can function normally under different connection requirements, effectively improve the convenience and reliability of users using the battery pack, and is also conducive to the stable operation and long-term maintenance of the equipment.

[0098] In some embodiments, for example Figure 6 and Figure 7 In the system shown, the above 1102 may include but is not limited to: obtaining a third indication signal output by the second isolation unit, and determining whether the host is connected to the battery pack and / or whether the battery pack is connected to the DC charging and discharging device based on the first indication signal and the third indication signal.

[0099] The third indication signal includes: a third valid signal and a third invalid signal.

[0100] The above-mentioned determination of whether the host is connected to the battery pack and / or whether the battery pack is connected to the DC charging and discharging device based on the first indication signal and the third indication signal may include but is not limited to any of the following situations:

[0101] Case A: According to the first invalid signal and the third invalid signal, it is determined that the host is connected to the battery pack, and the battery pack is not connected to the DC charging and discharging device.

[0102] Case B: According to the first invalid signal and the third valid signal, it is determined that the host is not connected to the battery pack, and the battery pack is connected to the DC charging and discharging device.

[0103] Case C: According to the first valid signal and the third invalid signal, it is determined that the host is connected to the battery pack, and the battery pack is connected to the DC charging and discharging device.

[0104] The above-mentioned battery pack connection identification method obtains the first indication signal and the third indication signal to determine the connection status. This multi-signal comprehensive judgment method greatly enhances the accuracy and comprehensiveness of connection identification. Through the various situations corresponding to different combinations of the first valid signal and the third invalid signal, the status relationship between the host and the battery pack, and the battery pack and the DC charging and discharging equipment in various complex connection situations can be accurately judged. This not only improves the robustness of the battery pack connection system and ensures the stable operation of the equipment under different working conditions, but also better coordinates the role allocation and functional collaboration between the battery pack and the DC charging and discharging equipment in a complex network environment with multiple devices connected, avoids the occurrence of control conflicts, and improves the communication efficiency and resource utilization of the entire system, thereby expanding the applicability and reliability of the battery pack in more diverse and complex usage scenarios, providing users with a better user experience and a more efficient energy management solution.

[0105] In some embodiments, the above method further includes: obtaining a second indication signal output by the battery pack, and the above second indication signal may be an indication signal for a pre-charging action. Exemplarily, when the above second indication signal is a second valid signal, the battery pack will perform a pre-charging action; when the above second indication signal is a second invalid signal, the battery pack will not perform a pre-charging action. Thereafter, based on the first indication signal and the third indication signal, it can be determined whether the host is connected to the battery pack, and / or whether the battery pack is connected to the DC Hub. If the host is connected to the battery pack, or the DCHub is connected to the battery pack, then the pre-charging action has a direct object of action. At this time, the host or DC Hub can be powered on smoothly and communicate with the battery pack, thereby ensuring the normal operation and coordinated work of the entire system.

[0106] The present application also provides an energy storage system, including the battery pack connection identification system as described in the above embodiments.

[0107] The present application also provides a battery pack connection identification device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, it implements the steps of the battery pack connection identification method shown in the above embodiment.

[0108] The present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the battery pack connection identification method shown in the above embodiment are implemented.

[0109] The present application also provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of the battery pack connection identification method shown in the above embodiment.

[0110] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0111] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the above-mentioned embodiments. In particular, any reference to memory, database, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), data processing logic devices based on quantum computing, and the like.

[0112] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0113] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A battery pack connection system, characterized in that: The system includes: a host, a first switch unit, a battery pack, and a DC charging and discharging device, wherein the first switch unit is arranged between an identification line of the host and an identification line of the battery pack; The DC charging and discharging device includes: a second switch unit and a first isolation unit; a first end of the second switch unit is connected to the identification line of the battery pack, and a second end of the second switch unit is connected to the first isolation unit; the first isolation unit is configured to output a first indication signal based on the switching state of the second switch unit; The first indication signal and the third indication signal are used to determine whether the host is connected to the battery pack, and / or whether the battery pack is connected to the DC charging and discharging device, and the battery pack is used to output the second indication signal based on the switching status of the first switch unit and the second switch unit; the DC charging and discharging device also includes: a second isolation unit, a first Zener diode and a second Zener diode; the first end of the second switch unit is connected to the positive identification line of the battery pack, and the second end of the second switch unit is connected to the anode of the first Zener diode and the cathode of the second Zener diode; the cathode of the first Zener diode is connected to the first isolation unit; the anode of the second Zener diode is connected to the second isolation unit, and the output end of the second isolation unit is connected to the negative identification line of the battery pack, and is connected to the ground end through the negative identification line; the second isolation unit is used to output the third indication signal based on the switching status of the first switch unit and the second switch unit.

2. The system according to claim 1, wherein: The first indication signal and the third indication signal are used to determine whether the host is connected to the battery pack and / or whether the battery pack is connected to the DC charging and discharging device, the first indication signal including: a first valid signal or a first invalid signal; the third indication signal including: a third valid signal and a third invalid signal; Wherein, when the first switch unit is closed and the second switch unit is open, the first isolation unit outputs the first invalid signal, and the second isolation unit outputs a third invalid signal; When the first switch unit is disconnected and the second switch unit is closed, the first isolation unit outputs the first invalid signal, and the second isolation unit outputs a third valid signal; When the first switch unit is closed and the second switch unit is closed, the first isolation unit outputs the first valid signal, and the second isolation unit outputs the third invalid signal.

3. The system according to claim 2, characterized in that The second isolation unit includes a second optical coupler; The cathode of the first voltage-stabilizing tube is connected to the cathode of the first optocoupler; The anode of the second voltage regulator tube is connected to the anode of the second optocoupler, the cathode of the second optocoupler is connected to the negative identification line of the battery pack, and is connected to the ground terminal through the negative identification line.

4. A battery pack connection identification method, characterized in that: The system as claimed in claim 1, comprising: obtaining a first indication signal output by the first isolation unit; According to the first indication signal and the third indication signal, determine whether the host is connected to the battery pack, and / or whether the battery pack is connected to the DC charging and discharging device, the battery pack is used to output a second indication signal based on the switching status of the first switch unit and the second switch unit, and the DC charging and discharging device also includes: a second isolation unit, a first Zener diode and a second Zener diode; the first end of the second switch unit is connected to the positive identification line of the battery pack, and the second end of the second switch unit is connected to the anode of the first Zener diode and the cathode of the second Zener diode; the cathode of the first Zener diode is connected to the first isolation unit; the anode of the second Zener diode is connected to the second isolation unit, and the output end of the second isolation unit is connected to the negative identification line of the battery pack, and is connected to the ground end through the negative identification line; the second isolation unit is used to output the third indication signal based on the switching status of the first switch unit and the second switch unit.

5. The method according to claim 4, characterized in that The first indication signal includes: a first valid signal or a first invalid signal; the third indication signal includes: a third valid signal and a third invalid signal; The determining, based on the first indication signal and the third indication signal, whether the host is connected to the battery pack and / or whether the battery pack is connected to the DC charging and discharging device includes: determining, according to the first invalid signal and the third invalid signal, that the host is connected to the battery pack, and that the battery pack is not connected to the DC charging and discharging device; or, determining, according to the first invalid signal and the third valid signal, that the host is not connected to the battery pack, and that the battery pack is connected to the DC charging and discharging device; or, According to the first valid signal and the third invalid signal, it is determined that the host is connected to the battery pack, and the battery pack is connected to the DC charging and discharging device.

6. An energy storage system, characterized in that: The invention comprises a battery pack connection system according to any one of claims 1 to 3.

7. A battery pack connection identification device, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the method according to claim 4 or claim 5 are implemented.

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