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

Abstract

The invention relates to a battery pack connection system, method and device and an energy storage system, the battery pack connection system comprises a host, a first switch unit, a battery pack and a direct current charging and discharging device, and the first switch unit is arranged between an identification line of the host and an identification line of the battery pack; the direct current charging and discharging equipment comprises a second switch unit and a first isolation unit; a first end of the second switch unit is connected with an identification line of the battery pack, and a second end of the second switch unit is connected with the first isolation unit; the first isolation unit is used for outputting a first indication signal based on the on-off state of the second switch unit; wherein the first indication signal is used for determining whether the host is connected with the battery pack or not, and / or whether the battery pack is connected with the direct-current charging and discharging equipment or not. The application can increase the usage scenarios of the battery pack and improve 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 current battery pack determines the connection status with the host through the positive identification line (REG +) and the negative identification line (REG -) and the buckle status. When REG + and REG - are short-circuited and the buckle is closed, the battery pack detects a high-level signal. After the battery pack detects a high-level signal and confirms that the battery pack is connected to the host, it can be pre-charged first so that the battery pack can power the host. After the pre-charge is successful and the battery pack establishes communication with the host, the battery pack can close the main metal oxide semiconductor field effect transistor (Metal-Oxide-Semiconductor, MOS) to power the host through the power line.

[0003] In the prior art, battery packs can only support charging and discharging by users with a single host, which results in some users who only purchase the battery pack but not the matching host being unable to charge and discharge the battery pack, limiting the use 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 used to output a first indication signal based on the switch 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] Acquire 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, comprising the system as described in the first aspect.

[0013] In a fourth aspect, the present application further 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, and when the computer program is executed by a processor, the steps of the method described in the second aspect are implemented.

[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 above-mentioned 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 identification line of the host and the identification line of the battery pack; 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 identification line of the battery pack, 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 switch 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. This solution, by setting the first switch unit, the second switch unit, the related identification line and the first isolation unit, etc., enables the battery pack to clearly make an effective connection judgment 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 discharging operations, expanding the application of the battery pack in different functional requirements. 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 AC power access at the construction site, the battery pack can be connected to the corresponding DC charging and discharging equipment through the connection system, and then the DC charging and discharging equipment can be connected to lighting fixtures and other tools that require electricity, allowing the battery pack to act 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 the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. 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 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] Fig. 9 A schematic diagram of a battery pack connection system in one embodiment Figure 5 ;

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

[0029] Fig.11 A schematic diagram of a flow chart of a battery pack connection method in an embodiment. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] As an energy storage device that provides electrical energy to equipment, the battery pack is widely used in the field of modern electronic equipment and power tools. It contains multiple cells inside, and ensures stable output and safe use of electrical energy through complex system design and management system. The structure of a battery pack usually includes a shell, a cell group, a protection system, and an interface for connecting external devices. These interfaces include power lines for transmitting electrical energy, and identification lines for communicating with external devices and identifying connection status. Among the many battery pack designs, the design of identification lines and connection devices is crucial to the functional realization and expansion of usage scenarios of the battery pack. They directly affect the interaction and adaptability between the battery pack and different devices.

[0032] The current battery pack determines the connection status with the host through the two lead-out identification lines, the positive identification line (REG +) and the negative identification line (REG -), and the status of the switches set on the identification lines. When REG + and REG - are short-circuited and the switch is closed, the battery pack detects a high-level signal. After the battery pack detects a high-level signal and confirms that the battery pack is connected to the host, it can be pre-charged first so that the battery pack can power the host. After the pre-charge is successful and the battery pack establishes communication with the host, the battery pack can close the main metal oxide semiconductor field effect transistor (MOS) to power the host through the power line.

[0033] In the prior art, battery packs can only support charging and discharging by users with a single host, which results in some users who only purchase the battery pack but not the matching host being unable to charge and discharge the battery pack, limiting the use 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 improve 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] A host 11 , a first switch unit 12 , a battery pack 13 and a DC charging and discharging device 14 , wherein the first switch unit 12 is disposed between an identification line of the host 10 and an 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-fits. 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 setting the first switch unit, the second switch unit and the related identification line and the first isolation unit, the battery pack can clearly determine the effective 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, you can connect the DC charging and discharging device 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, which also improves the user experience.

[0043] In some embodiments, the above Figure 1In the system shown, the first isolation unit 142 is used to output a first valid signal when the second switch unit 141 is closed, and to 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 Above Figure 1 The first switch unit 12 in the embodiment may 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 in 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 optical coupler 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 The GND_COM in the figure represents a common ground terminal, and GND1 and GND2 both represent ground terminals. Figure 2 In the figure, +12V_COM represents a positive 12 volt DC power supply, and +3V3 represents 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 The 2nd pin of SW in the circuit) is connected to the cathode of the first optical coupler U2; the first optical coupler U2 is used for the emitter of the first optical coupler U2 to output the first valid signal 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 optical coupler 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). The first diode D1 and the second diode D2 can be used for signal isolation to 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 in FIG. 1 , 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 not connected to 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 not connected to the DC charging and discharging device 14.

[0052] Exemplarily, 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 connection system when SW1 is closed and SW2 is disconnected. Since SW2 is disconnected, the blocked DC Hub circuit is not connected to the battery pack 13, and the first optocoupler U2 is not working. 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 working. LOCK1 is a high-level signal. A control unit can be provided in the battery pack 13, and the control unit can be connected to the third optocoupler U1. After the control unit receives the high-level signal, it can be confirmed that the host 11 has been connected to the battery pack 13. At this time, the battery pack 13 is controlled to perform pre-charging on the host 11. After the pre-charging is successful and the battery pack 13 establishes communication with the host 11, the control unit in the battery pack 13 can 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 is disconnected and SW2 is disconnected. Since SW1 is disconnected and SW2 is also 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 works, LOCK1 is a high-level signal, and the battery pack 13 automatically performs pre-charge output, while SW2 on the DC Hub side is disconnected, the first optocoupler U2 does not work 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, so 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 connection system when SW1 is open and SW2 is closed. Figure 5 , SW1 is disconnected, Figure 5The circuit of the host 11 part that is blocked is not connected to the battery pack 13. The third optocoupler U1 is grounded through the DC Hub, so the third optocoupler U1 works and LOCK1 is a high-level signal. The battery pack 13 is connected to the DC Hub through a cable and is directly grounded through the DC Hub side to automatically pre-charge the output. Since SW2 is closed, the first optocoupler U2 works, LOCK 2 is a high-level signal, and the DC Hub starts after power-on. The battery pack 13 and the DC Hub communicate successfully, and the battery pack 13 closes the main MOS and is charged and discharged by the DC Hub.

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

[0060] Exemplarily, SW1 and SW2 are closed at the same time, the third optocoupler U1 in the battery pack 13 works, the first optocoupler U2 in the DC Hub also works, LOCK 1 and LOCK 2 are both high-level signals, and the battery pack 13 confirms that the DC Hub and the host 11 are both connected. At this time, the DC Hub and the host 11 can be pre-charged. The battery pack 13 outputs normally to power the host 11, and the DC Hub is also powered on. After the pre-charge is successful and the host 11, the battery pack 13, and the DC Hub establish communication, the host 11 can identify the connection status through broadcast communication, and the host 11 coordinates 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] When the host 12 is communicating with the DC Hub, the host 12 needs to broadcast a message to the DC Hub first. The DC Hub replies after receiving the broadcast message. After the host 12 confirms that the DC Hub and the battery pack 13 exist in the system at the same time, the charging and discharging of the battery pack 13 and the DC Hub are uniformly coordinated.

[0063] It should be noted that the above-mentioned LOCK 1 can be an indication signal for the pre-charging action. Exemplarily, 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 will 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 action object. 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 FIG2 realizes 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, optocoupler, diode and other components). Specifically, by controlling the switch status of SW1 and the LOCK2 signal, different states have different effects, which expands 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 regulator tube DZ1 and the cathode of the second voltage regulator tube DZ2; the cathode of the first voltage regulator tube DZ1 is connected to the first isolation unit 142; the anode of the second voltage regulator 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 used to output a third indication signal based on the switch states of the first switch unit and the second switch 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 used 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 of the pre-charging action. Exemplarily, when the above-mentioned second indication signal is a second valid signal, the battery pack will perform the pre-charging action at this time; when the above-mentioned second indication signal is a second invalid signal, the battery pack will not perform the pre-charging action at this time. Thereafter, whether the host is connected to the battery pack, and / or whether the battery pack is connected to the DC Hub can be determined based on the first indication signal and the third indication signal. 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 can be Figure 7 The second optocoupler U3 in;

[0076] The cathode of the first voltage regulator 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 The battery pack 13 in the system is no longer directly grounded through the DC hub, which avoids the problem of automatic pre-charging of the battery pack after the battery pack 13 is connected to the DC Hub. The DC Hub can directly confirm the existence of the host 11 in the entire system through the LOCK2 signal. If the host 11 exists, the DC Hub automatically gives up the role of "master device" and acts as a "slave device" with the host 11 uniformly allocating the 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 optical coupler 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 the host 11 can be powered from the power line. Since SW2 is disconnected, Figure 8 The blocked DC charging and discharging device 14 (ie, DC Hub) is not connected to the battery pack 13, the first optical coupler U2 and the second optical coupler U3 are not working, 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 Fig. 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. Fig. 9 The blocked part 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, so the first voltage regulator DZ1 is cut off and the second voltage regulator DZ2 reversely breaks down, corresponding to Fig. 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 LOCK2 being a low-level signal, and the DC Hub plays the role of "master device" to control 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 Fig.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; and because the 2nd pin of the second voltage regulator DZ2 is short-circuited with GND_COM, the first voltage regulator DZ1 reversely breaks down, and the second voltage regulator DZ2 is cut off, making Fig.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 pre-charges, and the normal output powers the host 11, and the DC Hub is also powered on and started. The pre-charge 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, DCHub can determine that the battery pack 1 in the system is connected to the host 11 through LOCK2 being a high-level signal. At this time, it can report a signal to the host 11 to cooperate with the host 11 for charging and discharging.

[0086] In the embodiment of the present application, in the system shown in FIG6 and FIG7, the second isolation unit 143, the first voltage regulator DZ1 and the second voltage regulator DZ2 and other components are added to the DC charging and discharging device 14 (DCHub). When the battery pack 13 is connected to the DC Hub, the judgment and control logic of the connection state are changed through the cooperation of these newly added components and the original components (such as the first switch unit 12, the second switch unit 141, the first isolation unit 142, etc.). Thereby, the problem of being unable to pre-charge, power on, handshake communication and charge and discharge operations due to handshake failure or connection state switching is improved as a whole, the stability and reliability of the system are improved, and the effective application of battery packs in various complex scenarios is expanded.

[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. Battery Management System (BMS), inside the battery pack, BMS is a key component. It is mainly responsible for monitoring and managing various states of the battery pack, including battery voltage, current, temperature and other parameters. In the process of battery pack connection identification, BMS can be used as a connection identification device. For example, in the system shown in Figures 6 and 7, the second indication signal output by the battery pack and the first indication signal and the third indication signal output by the isolation unit can be obtained through the built-in circuit and sensor.

[0089] 2. Smart chargers. For some chargers with smart functions, they 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. The smart charger can obtain relevant indication signals through its internal detection circuit to determine whether the battery pack is correctly connected. If the connection is normal, it can adjust the charging parameters, such as charging current, charging voltage, etc., according to the type and status of the battery pack. At the same time, it can also communicate with the BMS or host inside the battery pack to achieve effective control of the entire charging process.

[0090] 3. The power management module of the host device. In the host device (such as power tools, electronic equipment, etc.), the power management module can also act as a battery pack connection identification device. When the battery pack is connected to the host, the power management module will detect the connection signal. It determines whether the battery pack has been successfully connected by receiving the indication signal from the battery pack and the isolation unit. If the connection is successful, the power management module can control the communication between the host and the battery pack, coordinate the process of the battery pack powering the host, ensure the normal operation of the host, and monitor the connection status of the battery pack in real time during operation to deal with possible abnormal connection situations.

[0091] For example, Fig.11 The figure is a flow chart of a battery pack connection identification method, which may include but is not limited to:

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

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

[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 a first indication signal; and determining whether the host is connected to the battery pack according to a switching state of the first switching unit.

[0096] Wherein, when the first indication signal is a first valid signal, it is determined that the battery pack is connected to the DC charging and discharging device; when the first indication signal is a first invalid signal, it is determined that the battery pack is not connected to the DC charging and discharging device. When the first switch unit is closed, it is determined that the host is connected to the battery pack; when the first switch unit is open, it is determined that the host is not connected to 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 the battery pack and the DC charging and discharging device by obtaining the switching state 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, DC charging and discharging equipment, 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 according to 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 state 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 can better coordinate 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, avoid the occurrence of control conflicts, and improve 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, and providing users with a better user experience and more efficient energy management solutions.

[0105] In some embodiments, the above method also 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 at this time; when the above second indication signal is a second invalid signal, it indicates that 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 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, the steps of the battery pack connection identification method shown in the above embodiment are implemented.

[0108] The present application also provides a computer-readable storage medium having a computer program stored thereon, and 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 above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed 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 part of the steps or stages in other steps.

[0111] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and 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 embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium 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), magnetoresistive 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. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0112] The technical features of the above embodiments may 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 only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A battery pack connection system, characterized in that: The system comprises: 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 used to output a first indication signal based on the switch 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.

2. The system according to claim 1, characterized in that The first indication signal includes: a first valid signal or a first invalid signal; The first isolation unit is used to output a first valid signal when the second switch unit is closed, and output a first invalid signal when the second switch unit is opened; The first indication signal and the switch state of the first switch unit 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.

3. The system according to claim 2, characterized in that The first isolation unit includes: a first optical coupler; A first end of the second switch unit is connected to a positive identification line and a negative identification line of the battery pack, and is connected to a ground terminal through the negative identification line, and a second end of the second switch unit is connected to a cathode of the first optical coupler; The first optocoupler is configured to output the first valid signal at the emitter of the first optocoupler when the second switch unit is closed, and output the first invalid signal at the emitter of the first optocoupler when the second switch unit is opened.

4. The system according to any one of claims 1 to 3, characterized in that: The battery pack is configured to output a second indication signal based on the switch states of the first switch unit and the second switch unit; The DC charging and discharging device further includes: a second isolation unit, a first voltage regulator tube and a second voltage regulator tube; 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 voltage regulator tube and the cathode of the second voltage regulator tube; the cathode of the first voltage regulator tube is connected to the first isolation unit; the anode of the second voltage regulator tube 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 a third indication signal based on the switching states of the first switch unit and 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.

5. The system 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; Wherein, when the first switch unit is closed and the second switch unit is opened, 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 opened 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.

6. The system according to claim 5, characterized in that The second isolation unit includes a second optical coupler; The cathode of the first voltage regulator 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.

7. A battery pack connection identification method, characterized in that: The system as claimed in claim 1, comprising: Acquire a first indication signal output by the first isolation unit; According to the first indication signal, it is determined whether the host is connected to the battery pack and / or whether the battery pack is connected to the DC charging and discharging device.

8. The method according to claim 7, characterized in that The determining, according to the first 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 whether the battery pack is connected to the DC charging and discharging device according to the first indication signal; Whether the host is connected to the battery pack is determined according to the switch state of the first switch unit.

9. The method according to claim 8, characterized in that The battery pack is used to output a second indication signal based on the switching states of the first switch unit and the second switch unit. The DC charging and discharging device also includes: a second isolation unit, a first voltage regulator tube and a second voltage regulator tube; 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 voltage regulator tube and the cathode of the second voltage regulator tube; the cathode of the first voltage regulator tube is connected to the first isolation unit; the anode of the second voltage regulator tube 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 a third indication signal based on the switching states of the first switch unit and the second switch unit; The determining, according to the first 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: According to the first indication signal and the third indication signal, it is determined whether the host is connected to the battery pack and / or whether the battery pack is connected to the DC charging and discharging device.

10. The method according to claim 9, 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, according to 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 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.

11. An energy storage system, characterized in that: A battery pack connection system comprising the battery pack connection system as claimed in any one of claims 1 to 6.

12. 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 the processor implements the steps of the method according to any one of claims 7 to 10 when executing the computer program.

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