Battery pack, battery pack parallel operation system, electronic equipment and battery pack parallel operation method

Abstract

The invention discloses a battery pack, a battery pack parallel operation system, electronic equipment and a battery pack parallel operation method.The battery pack comprises a battery cell assembly, a battery management unit electrically connected with the battery cell assembly and a first connector electrically connected with the battery management unit, and the battery management unit comprises a processor and a switch assembly; the first connector comprises a positive electrode output terminal and a negative electrode output terminal; the switch assembly is arranged between the cathode of the battery cell assembly and the cathode output terminal; the first connector further comprises a first pin, the first pin is connected with the processor, and the first pin is further configured to be connected with first pins of other battery packs through a first communication wire harness; the processor is configured to transmit data with other battery packs through the first communication wire harness in a half-duplex communication mode.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a battery pack, a battery pack parallel system, an electronic device, and a battery pack parallel method. Background Art

[0002] At present, by expanding the capacity or power of the battery system of electric vehicles (including electric two-wheeled vehicles, such as electric bicycles, electric motorcycles, etc.), the cruising range of the entire vehicle can be improved. In related technologies, the capacity or power of the battery system of the entire vehicle can be expanded by connecting battery packs in parallel. Battery pack paralleling refers to connecting multiple battery packs in parallel, and multiple parallel battery packs are charged or discharged in parallel. Multiple parallel battery packs can be regarded as a battery pack with a larger capacity. Summary of the invention

[0003] Existing electric two-wheeled vehicles are generally equipped with a battery pack. For example, the battery pack configured in a national standard electric vehicle has a specification of 48V24Ah or 48V12Ah. However, the capacity and power of this specification battery pack are relatively small, resulting in a short cruising range of the national standard electric vehicle. It is necessary to expand the capacity and power of the electric two-wheeled vehicle.

[0004] When developing products and technologies for multi-pack parallel operation, the inventors found that consumers who modify electric two-wheeled vehicles or users who want to expand capacity and power, such as food delivery couriers who often need larger capacity electric two-wheeled vehicles to increase driving range, will blindly put a battery pack into the battery compartment of the electric two-wheeled vehicle and connect it in parallel with the original battery pack in the battery compartment to expand the capacity of the battery system. However, since the battery pack and the electric two-wheeled vehicle use a single-line serial port for communication, blindly using two battery packs in parallel without communication between the battery packs may cause circulating current, resulting in the risk of damage to the battery cells or power switches.

[0005] On the other hand, in the battery pack and battery pack parallel scheme in the related art, the communication between the battery pack and the electric two-wheeled vehicle adopts a solution with higher communication efficiency, such as a CAN communication solution or a 485 communication solution. The adoption of the above solutions will significantly increase the cost, because CAN communication and 485 communication usually require two communication harnesses, and more pins need to be set on the connector that matches the communication harness. The communication circuits matched with CAN communication and 485 communication are more complicated. However, these are not friendly to the pursuit of low-cost battery parallel solutions.

[0006] Based on this, on the first aspect, an embodiment of the present application provides a battery pack, comprising: a battery cell assembly, a battery management unit electrically connected to the battery cell assembly, and a first connector electrically connected to the battery management unit, the battery management unit comprising a processor and a switch assembly, the first connector comprising a positive output terminal and a negative output terminal; the switch assembly is arranged between the negative electrode of the battery cell assembly and the negative output terminal; the first connector also comprises a first pin, the first pin is connected to the processor, and the first pin is also configured to be connected to the first pin of other battery packs through a first communication harness; the processor is configured to transmit data with other battery packs using half-duplex communication through the first communication harness.

[0007] Through the above technical solution, when multiple battery packs are connected in parallel, different battery packs can communicate with each other through the first communication harness, which is convenient for determining whether multiple battery packs meet the conditions for parallel connection, reducing the battery circulation current, and improving the reliability of battery pack parallel connection. Moreover, the battery packs communicate with each other through the first communication harness, and the first communication harness is a single communication line. Compared with CAN communication and 485 communication, the number of communication lines required is less, the number of pins matched with the communication lines is less, and the communication circuit is simpler to adapt, which reduces the cost of the battery pack. In addition, the first pin of the battery pack is connected to the first pin of other battery packs through the first communication harness. When the switch assembly of the battery pack is in the disconnected state, the battery pack can still transmit data with other battery packs through the first communication harness, realize communication between battery packs, and thus improve the reliability of battery pack parallel connection.

[0008] In one or more embodiments of the present application, the first connector also includes a second pin connected to the processor, and the second pin is also configured to communicate with the electronic device through a second communication harness; the processor is also configured to transmit data with the electronic device using a half-duplex communication method through the second communication harness.

[0009] Through the above technical solution, the battery pack can exchange data with the electronic device through the second communication wire harness. The second communication wire harness in the electronic device is a single communication wire, which reduces the cost of the electronic device.

[0010] In one or more embodiments of the present application, the first connector also includes a third pin connected to the processor, and the processor is configured to determine that the battery pack is connected to the charging device in the electronic device through the third pin; and / or, the first connector also includes a fourth pin connected to the processor, and the processor is configured to determine that the battery pack is connected to the discharging device in the electronic device through the fourth pin.

[0011] Through the above technical solution, the battery pack can detect through the processor whether the electronic device connected to the battery pack is a charging device or a discharging device, thereby facilitating the control of the battery pack to charge and / or discharge.

[0012] In one or more embodiments of the present application, the battery management unit includes a first pull-down resistor electrically connected to the negative output terminal, and the first pull-down resistor is configured to be electrically connected to a first pull-up resistor in the electronic device; the processor is configured to determine whether the battery pack is a master battery pack or a slave battery pack based on the resistance value of the first pull-down resistor and the resistance value of the first pull-up resistor in response to the battery pack being connected to the electronic device.

[0013] Through the above technical solution, the battery pack can determine whether the battery pack is a master battery pack or a slave battery pack based on the resistance value of the first pull-down resistor and the resistance value of the first pull-up resistor.

[0014] In one or more embodiments of the present application, the battery management unit further includes a data acquisition unit, which is communicatively connected to the processor and configured to acquire data of the battery pack.

[0015] In a second aspect, an embodiment of the present application provides a battery pack parallel system, comprising: N battery packs as in the first aspect, the N battery packs are configured to be connected in parallel, and N is a positive integer greater than or equal to 2; a first communication harness is configured to be connected to a first pin of each battery pack, and the first communication harness is a single communication harness; the N battery packs are configured to transmit data using a half-duplex communication method via the first communication harness.

[0016] Through the above technical solution, when N battery packs are connected in parallel, different battery packs can communicate with each other through the first communication harness, which is convenient for determining whether the N battery packs meet the parallel conditions, reducing or lowering the battery circulation current, and improving the reliability of the battery pack parallel connection. Moreover, each battery pack communicates with each other through the first communication harness. The first communication harness is a single communication line. Compared with CAN communication and 485 communication, the number of communication lines required is smaller, the number of pins matched with the communication lines is smaller, and the communication circuit is simpler, which reduces the cost of the battery pack. In addition, the first pin of the battery pack is connected to the first pin of other battery packs through the first communication harness. When the switch assembly of the battery pack is in the disconnected state, the battery pack can still transmit data through the first communication harness to achieve communication between battery packs, thereby improving the reliability of the battery pack parallel connection.

[0017] In one or more embodiments of the present application, the N battery packs include a master battery pack and N-1 slave battery packs; the processor of the master battery pack is also configured to control the switch component of the slave battery pack to open or close based on the data of the master battery pack and the data of the slave battery pack.

[0018] Through the above technical solution, the switch components of N battery packs are controlled to be turned on or off by the main battery pack, thereby ensuring the consistency of the operation of the switch components of the battery packs and reducing the risk of missing the opportunity for parallel connection.

[0019] In one or more embodiments of the present application, the first connector of each battery pack includes a second pin connected to the processor and a second communication harness, and the second pin of each battery pack is configured to communicate with the electronic device through the second communication harness; the processor of the main battery pack is also configured to transmit data to the electronic device through the second communication harness using half-duplex communication.

[0020] Through the above technical solution, when the battery pack parallel system communicates with the electronic device, the main battery pack transmits the data of N battery packs to the electronic device through the second communication harness. In the battery pack parallel system, the main battery pack has obtained the data of all battery packs and makes control operations based on these data, such as controlling the opening or closing of the switch assembly of the slave battery pack. This simplifies the secondary processing of the battery pack data by the electronic device, reduces the re-judgment of the electronic device, and increases the adaptability of the battery pack parallel system to different types of electronic devices.

[0021] In a third aspect, an embodiment of the present application provides an electronic device, comprising a battery pack parallel system as in the second aspect, wherein the first connector comprises a second pin, and the electronic device comprises a second communication harness, wherein the second communication harness is connected to the second pin of each battery pack; and N second connectors, wherein each second connector is connected to the first connector of each battery pack.

[0022] Through the above technical solution, the connection between the battery pack parallel system and the electronic device is realized through the second connector. The N battery packs in the battery pack parallel system can realize the expansion capacity and power of the battery system in the electronic device. When multiple battery packs are connected in parallel, different battery packs can communicate through the first communication harness, which is convenient for determining whether multiple battery packs meet the parallel conditions, reducing or reducing the battery circulation, and improving the reliability of the battery pack parallel. Moreover, the battery packs communicate through the first communication harness, and the first communication harness is a single communication line. Compared with CAN communication and 485 communication, the number of communication lines required is less, the number of pins matched with the communication line is less, and the communication circuit is simpler, which reduces the cost of the battery pack. In addition, the first pin of the battery pack is connected to the first pin of other battery packs through the first communication harness. When the switch assembly of the battery pack is in the disconnected state, the battery pack can still transmit data with other battery packs through the first communication harness, realizing communication between battery packs, thereby improving the reliability of the battery pack parallel.

[0023] In one or more embodiments of the present application, the electronic device also includes: N battery pack identification circuits, each battery pack identification circuit including a first pull-up resistor, a first pull-down resistor and a power supply, one end of the first pull-down resistor is electrically connected to the power supply through the first pull-up resistor, and the other end of the first pull-down resistor is electrically connected to the negative output terminal; the first pull-up resistor and the power supply are arranged in the electronic device, and the first pull-down resistor is arranged in the battery pack; wherein, among the N battery pack identification circuits, the resistance values ​​of the first pull-up resistors in different battery pack identification circuits are different.

[0024] Through the above technical solution, the battery pack can determine whether the battery pack is a master battery pack or a slave battery pack based on the resistance value of the first pull-down resistor and the resistance value of the first pull-up resistor.

[0025] In one or more embodiments of the present application, the electronic device includes a discharge device, the discharge device includes N battery accommodating cavities, and the battery pack and the second connector are arranged in the battery accommodating cavities.

[0026] Through the above technical solution, different battery packs can be placed in different battery accommodating cavities, so that the master battery pack and the slave battery pack can be distinguished by the battery accommodating cavities in which the battery packs are located.

[0027] In one or more embodiments of the present application, the electronic device includes a charging device, and the charging device includes a charger and an adapter plug; one end of the adapter plug is configured to be connected to N second connectors respectively, and the other end of the adapter plug is configured to be connected to the charger.

[0028] In a fourth aspect, an embodiment of the present application provides a battery parallel method, which is applied to an electronic device such as the third aspect, and the method includes: in response to N battery packs being awakened, a main battery pack obtains data of N-1 slave battery packs through a first communication harness; the main battery pack controls the switch components of the main battery pack and the switch components of the slave battery pack to open or close according to the data of the main battery pack and the data of the N-1 slave battery packs.

[0029] Through the above technical solution, when N battery packs are connected in parallel, N-1 slave battery packs can transmit their own data to the main battery pack through the first communication harness, so that the main battery pack can determine whether the N battery packs meet the parallel conditions based on the data of the N battery packs, reduce or lower the battery circulation, improve the reliability of the battery pack parallel connection, and control the switch assembly of each battery pack through the main battery pack to ensure the consistency of the operation of the switch assemblies of multiple battery packs, thereby reducing the risk of missing the opportunity for parallel connection. Moreover, the battery packs communicate with each other through the first communication harness, which is a single communication line. Compared with CAN communication and 485 communication, the number of communication lines required is less, the number of pins matched with the communication line is less, and the communication circuit is simpler, which reduces the cost of the battery pack. In addition, by setting the first communication harness between the battery packs, when the switch assembly of the battery pack is in the disconnected state, the battery pack can still transmit data with other battery packs through the first communication harness, realize communication between the battery packs, and thus improve the reliability of the battery pack parallel connection.

[0030] In one or more embodiments of the present application, the main battery pack obtains data of N-1 slave battery packs through a first communication harness, including: the main battery pack sends a first message to each slave battery pack, and receives a second message sent by each slave battery pack; wherein the first message contains the data of the main battery pack, control instructions for the slave battery pack, and instructions for instructing the slave battery pack to reply to the message, the control instructions include instructions for controlling the switch component of the slave battery pack to open or close; the second message contains the data of the slave battery pack.

[0031] Through the above technical solution, data is transmitted between the master battery pack and the slave battery pack through messages, which improves data transmission efficiency and reliability.

[0032] In one or more embodiments of the present application, the method also includes: in response to the main battery pack being awakened, the main battery pack receives a query request sent by the electronic device through the second communication harness, and sends the data of the main battery pack and the data of N-1 slave battery packs to the electronic device.

[0033] Through the above technical solution, when the battery pack parallel system communicates with the electronic device, the main battery pack transmits the data of N battery packs to the electronic device through the second communication harness. In the battery pack parallel system, the main battery pack has obtained the data of all battery packs and makes control operations based on these data, such as controlling the opening or closing of the switch assembly of the slave battery pack. This simplifies the secondary processing of the battery pack data by the electronic device, reduces the re-judgment of the electronic device, and increases the adaptability of the battery pack parallel system to different types of electronic devices.

[0034] In one or more embodiments of the present application, the method also includes: for each of the N battery packs, in response to the battery pack being connected to the electronic device, determining whether the battery pack is a master battery pack or a slave battery pack based on the resistance value of a first pull-down resistor in the battery pack and the resistance value of a first pull-up resistor in the electronic device.

[0035] Through the above technical solution, each battery pack can determine whether it is a master battery pack or a slave battery pack based on its own first pull-down resistor and resistance value and the resistance value of the first pull-up resistor connected thereto in the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application.

[0037] Figure 1 is a schematic diagram of a battery pack provided in an embodiment of the present application;

[0038] Figure 2 is a schematic diagram of a first connector provided in an embodiment of the present application;

[0039] Figure 3 is a schematic diagram of a battery pack provided in an embodiment of the present application;

[0040] Figure 4 is a schematic diagram of a battery pack provided in an embodiment of the present application;

[0041] Figure 5 is a schematic diagram of a battery pack provided in an embodiment of the present application;

[0042] Figure 6 is a schematic diagram of a battery pack provided in an embodiment of the present application;

[0043] Figure 7 is a schematic diagram of a battery pack provided in an embodiment of the present application;

[0044] Figure 8 is a schematic diagram of a battery pack parallel system provided in an embodiment of the present application;

[0045] Fig. 9 is a schematic diagram of an electronic device provided in an embodiment of the present application;

[0046] Fig.10 It is a flowchart of the battery parallel method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0047] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the examples of the present application are provided to provide a better understanding of the present application, and the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application.

[0048] It will be understood that, herein, relational terms such as first and second, etc., are merely used to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0049] For ease of understanding, the professional terms in the embodiments of the present application are explained.

[0050] Battery circulation refers to the phenomenon that when multiple battery packs are used in parallel, current circulates between them due to differences in parameters between the multiple battery packs. For example, if there is a difference in voltage between two battery packs, the battery pack with a higher voltage charges the battery pack with a lower voltage, forming a circulation.

[0051] Half-duplex communication refers to a working mode in which both parties can send and receive messages, but cannot send and receive at the same time. For example, single-line communication is a half-duplex communication, characterized by single-line communication: data is transmitted using a single signal line. This communication mode allows data to be transmitted in both directions, but only allows signals to be transmitted in one direction at a time.

[0052] The battery pack, battery pack parallel system, electronic device and battery parallel method provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0053] The battery pack provided in the embodiments of the present application is applied in the battery parallel scenario of the electronic device. In some embodiments, the electronic device includes a charging device, and the charging device is used to charge the battery pack. In other embodiments, the electronic device includes a discharge device, and the discharge device is turned on after being connected to the battery pack to consume the power of the battery pack. Exemplarily, the discharge device includes an electric two-wheeled vehicle such as an electric bicycle and an electric motorcycle, and the charging device includes a charger assembly, and the charging assembly includes a charger and a charging adapter.

[0054] See also Figure 1 , is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application, such as Figure 1As shown, the battery pack 100 provided in the embodiment of the present application includes a battery cell assembly 110, a battery management unit 120 electrically connected to the battery cell assembly 110, and a first connector 130 electrically connected to the battery management unit 120. The battery management unit 120 includes a switch assembly 121 and a processor 122, the first connector 130 includes a positive output terminal 131 and a negative output terminal 132, the battery cell assembly 110 includes a positive electrode and a negative electrode, as an example, in Figure 1 In FIG. 1 , the positive electrode of the battery cell assembly 110 is represented by B+, the negative electrode of the battery cell assembly 110 is represented by B-, the positive output terminal 131 is represented by P+, and the negative output terminal 132 is represented by P-. Figure 1 As shown, the switch assembly 121 is disposed between the negative electrode of the battery cell assembly 110 and the negative electrode output terminal 132. The first connector 130 also includes a first pin 133, which is connected to the processor 122. The first pin 133 is also connected to other terminals such as the processor 122 through a first communication harness. Figure 1 The first pin 133 of the first connector in the battery pack 100 shown is connected, the first communication harness is a single communication line, and the processor 122 is configured to transmit data with other battery packs in a half-duplex communication manner through the first communication harness.

[0055] The battery cell assembly 110 includes one or more single cells. When the battery cell assembly 110 includes multiple single cells, the multiple single cells can be connected in series, in parallel, or in mixed connection. The mixed connection of multiple single cells indicates that the connection mode between the single cells includes both series connection and parallel connection. The switch assembly 121 includes a charging switch and a discharging switch. For example, the charging switch and the discharging switch include MOSFETs.

[0056] In some embodiments, the first connector 130 includes a socket. For example, the first connector 130 includes Figure 2 Socket shown.

[0057] The data transmitted by the battery pack 100 includes the temperature of the battery pack 100, the voltage of the single cells of the battery pack 100, the fault information of the battery pack 100, the voltage of the battery pack 100, the on / off status of the switch assembly 121 of the battery pack 100, and other data related to the parallel operation of the battery pack.

[0058] Multiple electronic devices are provided such as Figure 1 The battery pack 100 shown in FIG. 1 expands the capacity and power by connecting multiple battery packs 100 in parallel. Figure 8When the battery packs 100 shown are connected in parallel, multiple battery packs 100 communicate with each other through the first communication harness 180 to achieve data exchange. In this way, when the batteries are connected in parallel, it is possible to determine whether the multiple battery packs 100 meet the parallel conditions through communication between the multiple battery packs 100, thereby reducing or lowering the battery circulation caused by parameter differences or faults, and improving the reliability of the battery pack connection.

[0059] During the battery pack parallel process, for each battery pack 100, when the data of the battery pack 100 does not meet the set parallel conditions, the switch assembly 121 of the battery pack 100 is controlled to be disconnected, so that the electrical connection between the negative electrode of the battery cell assembly 110 and the negative output terminal 132 is disconnected, and the charging and discharging of the battery pack 100 is stopped; when the data of the battery pack 100 meets the parallel conditions, the switch assembly 121 of the battery pack 100 is controlled to be opened, the electrical connection between the negative electrode of the battery cell assembly 110 and the negative output terminal 132 is turned on, and the battery pack 100 is charged and discharged. When the switch assembly of the battery pack 100 is turned on, the data of the battery pack 100 is transmitted through a loop composed of the battery cell assembly 110, the processor 122, the first connector and the negative electrode of the battery cell assembly 110. The switch assembly 121 is arranged between the negative electrode of the battery cell assembly 110 and the negative electrode output terminal 132 of the first connector 130. When the switch assembly 121 is disconnected, the above loop is also disconnected. At this time, the battery pack 100 will not be able to communicate through the loop, resulting in interruption of communication based on the loop. In this embodiment, the first pin 133 of the battery pack 100 is connected to the first pin 133 of other battery packs 100 through the first communication harness, so that when the switch assembly 121 of the battery pack 100 is in the disconnected state, the battery pack 100 continues to transmit data with other battery packs 100 through the first communication harness, thereby reducing problems such as battery parallel failure and battery circulation caused by communication interruption, and improving the reliability of battery parallel.

[0060] In one or more embodiments of the present application, Figure 3 As shown, the first connector 130 of the battery pack 100 also includes a second pin 134, the second pin 134 is connected to the processor 122, and the second pin 134 is also connected to the electronic device through the second communication harness 140. Optionally, after the first connector 130 of the battery pack 100 and the second connector 910 in the electronic device are plugged in, the second pin 134 on the first connector 130 is connected to the second communication harness 140 in the electronic device through the second connector 910. In this way, the electronic device communicates with the battery pack 100 through the second communication harness 140. The second communication harness 140 is a single communication harness, for example, the second communication harness 140 is a communication bus in the electronic device.

[0061] like Figure 3As shown, the second connector 910 includes a positive terminal P1+ and a negative terminal P1-. After the first connector 130 and the second connector 910 are plugged into each other, the positive output terminal 131 (P+) of the battery pack 100 is connected to the positive terminal P1+, and the negative output terminal 132 (P-) of the battery pack 100 is connected to the negative terminal P1-, thereby realizing power interaction and communication interaction between the battery pack 100 and the electronic device.

[0062] In one or more embodiments of the present application, the processor 122 is configured to detect that the electronic device connected to the battery pack 100 is a charging device 150 .

[0063] like Figure 4 As shown, in some embodiments, the first connector 130 includes, in addition to the first pin 133 and the second pin 134, a third pin 135 connected to the processor 122, and the third pin 135 is used to receive an access signal from the charging device 150. When the battery pack 100 is connected to the charging device 150, the processor 122 receives the access signal from the charging device 150 through the third pin 135. Based on this, the processor 122 is configured to determine whether the battery pack 100 is connected to the charging device 150 through the third pin 135. Specifically, when the processor 122 receives the access signal from the charging device 150 through the third pin 135, it determines that the battery pack 100 is connected to the charging device.

[0064] In one or more embodiments of the present application, the processor 122 is configured to detect that the electronic device connected to the battery pack 100 is a discharge device 160 .

[0065] like Figure 4 As shown, in some embodiments, the first connector 130 includes, in addition to the first pin 133 and the second pin 134, a fourth pin 136 connected to the processor 122, and the fourth pin 136 is used to receive an access signal of the discharge device 160. When the battery pack 100 is connected to the discharge device 160, the processor 122 can receive the access signal of the discharge device 160 through the fourth pin 136. Based on this, the processor 122 is configured to determine whether the battery pack 100 is connected to the discharge device 160 through the fourth pin 136. Specifically, when the processor 122 receives the access signal of the discharge device through the fourth pin 136, it determines that the battery pack 100 is connected to the discharge device.

[0066] Through the above technical solution, the battery pack 100 detects through the processor 122 whether the battery pack 100 is connected to a discharging device or a charging device, so as to control the charging and discharging of the battery pack 100 .

[0067] In one or some embodiments of the present application, the processor 122 and the first connector 130 use different rules for representing electrical signals with high level and low level. Figure 5 As shown, a communication level conversion circuit 123 is provided between the processor 122 and the first connector 130 , and the communication level conversion circuit 123 is used to convert the level of the electrical signal.

[0068] In the battery pack parallel scheme in the related art, the electronic device obtains the data of multiple battery packs in parallel and determines whether the battery packs meet the parallel conditions. Since different types of electronic devices have different judgment rules, the adaptability is poor, and each battery pack exchanges data with the electronic device separately. Due to the delay in data interaction, the battery pack parallel connection cannot be determined in time, and the parallel opportunity is missed. In view of this, in one or more embodiments of the present application, when N battery packs 100 are connected in parallel, the N battery packs 100 are divided into a master battery pack and N-1 slave battery packs, where N is a positive integer greater than or equal to 2. During the battery pack parallel connection process and the communication process with the electronic device, the master battery pack and the slave battery pack perform different operations, wherein the operations performed by the master battery pack include: obtaining data of N-1 slave battery packs, and controlling the main battery pack's own switch component 121 and the N-1 slave battery packs' switch components 121 to open or close based on the master battery pack's own data and the N-1 slave battery packs' data; the operations performed by the slave battery pack include: transmitting the slave battery pack's own data to the master battery pack, and controlling its own switch component 121 to open or close based on the control instruction sent by the master battery pack.

[0069] Through the above technical solution, the switch components of N battery packs are controlled to be turned on or off by the main battery pack, thereby ensuring the consistency of the actions of the switch components 121 of the N battery packs 100 and reducing the risk of missing the opportunity to connect the batteries.

[0070] In one or more embodiments of the present application, Figure 6 As shown, the battery management unit 120 includes a first pull-down resistor 124 electrically connected to the negative output terminal 132, and the electronic device includes a power source VCC, for example, the power source VCC is a voltage source with a voltage of 5V, and the first pull-down resistor 124 is electrically connected to the power source VCC through a first pull-up resistor 170 in the electronic device. A plurality of first pull-up resistors 170 with different resistance values ​​are provided in the electronic device, and different battery packs 100 are connected to first pull-up resistors 170 with different resistance values. Based on this, the processor 122 is configured to determine whether the battery pack 100 is a master battery pack or a slave battery pack based on the resistance value of the first pull-down resistor 124 and the resistance value of the first pull-up resistor 170 in response to the battery pack 100 being connected to the electronic device.

[0071] In one or some embodiments of the present application, the voltage of the power supply VCC is 5V. After the battery pack 100 is connected to the electronic device, the power supply VCC is divided according to the first pull-up resistor 170 and the first pull-down resistor 124 with different resistance values. The BMS of the battery pack 100 detects the voltage difference across the first pull-down resistor 124, that is, the voltage value divided by the first pull-down resistor 124 is within a certain voltage range, and then determines whether the battery pack 100 is a master battery pack or a slave battery pack.

[0072] Exemplarily, there are two battery packs 100 connected in parallel in the electronic device. For the convenience of distinction, the two battery packs 100 are respectively referred to as the first battery pack and the second battery pack, wherein the resistance of the first pull-down resistor 124 of the first battery pack and the second battery pack is both 15KΩ, the voltage of the power supply VCC is 5V, the resistance of the first pull-up resistor 170 connected to the first pull-down resistor 124 of the first battery pack is 5.1KΩ, and the resistance of the first pull-up resistor 170 connected to the first pull-down resistor 124 of the second battery pack is 15KΩ. Accordingly, the voltage divided by the first pull-down resistor 124 of the first battery pack is approximately 4.66V, and the voltage divided by the first pull-down resistor 124 of the second battery pack is approximately 2.5V, then the processor 122 of the first battery pack determines that the first battery pack is the master battery pack, and the processor 122 of the second battery pack determines that the second battery pack is the slave battery pack.

[0073] Through the above technical solution, the third pin 135 and the fourth pin 136 can be used not only to detect whether the battery pack 100 is connected to the electronic device, but also to identify the identity of the battery pack 100. In this way, pin multiplexing is achieved, the number of pins used is reduced, and the cost of the battery pack and the electronic device is further reduced.

[0074] In one or more embodiments of the present application, see Figure 7 The battery management unit 120 further includes a data acquisition unit 125, which is electrically connected to the battery cell assembly 110 to collect battery data, such as the voltage of the battery pack, the voltage of the single battery cell, and the temperature of the battery cell. The data acquisition unit 125 is communicatively connected to the processor 122 to transmit the collected battery data to the processor 122. Exemplarily, the data acquisition unit 125 includes an AFE (Analog Front End) chip.

[0075] Based on the battery pack 100 provided in the above embodiment, the present application also provides an embodiment of a battery pack parallel system, which will be described below in conjunction with a specific embodiment.

[0076] See also Figure 8 , is a schematic diagram of the structure of a battery pack parallel system provided in some embodiments of the present application, such as Figure 8 As shown, the battery pack parallel system 800 includes: N as described above Figure 1-Figure 7The battery pack 100 and the first communication harness 180 shown in the figure, wherein N battery packs 100 are connected in parallel, and N is a positive integer greater than or equal to 2. For ease of explanation, Figure 8 Only N is 2 as an example. The first communication harness 180 is configured to be connected to the first pin of each battery pack 100, and different battery packs 100 are connected to each other through the first communication harness 180. Figure 8 As shown, two battery packs 100 are connected to each other through a first communication harness 180. The first communication harness 180 is a single communication harness; the N battery packs 100 are configured to transmit data through the first communication harness 180 in a half-duplex communication manner.

[0077] Through the above technical solution, when N battery packs 100 are connected in parallel, different battery packs 100 can communicate through the first communication harness 180, which is convenient for determining whether the N battery packs 100 meet the parallel conditions, reducing or lowering the battery circulation, and improving the reliability of the battery pack parallel connection. Moreover, each battery pack 100 communicates through the first communication harness 180, and the first communication harness 180 is a single communication line. Compared with CAN communication and 485 communication, the number of communication lines required is less, the number of pins matched with the communication lines is less, and a simpler communication circuit is adapted, which reduces the cost of the battery pack. In addition, by setting the first communication harness between the battery packs 100, when the switch assembly of the battery pack 100 is in the disconnected state, the battery pack 100 can still communicate through the first communication harness, thereby reducing the parallel connection failure and battery circulation caused by communication interruption, and improving the reliability of battery parallel connection.

[0078] In one or more embodiments of the present application, N battery packs 100 are divided into a master battery pack and N-1 slave battery packs, and the first pin 133 of each slave battery pack is connected to the first pin 133 of the master battery pack through the first communication harness 180, and each slave battery is configured to communicate with the master battery pack in a half-duplex communication manner through the first communication harness 180 to transmit the data of the slave battery pack to the master battery pack. The processor 122 of the master battery pack is also configured to control the switch component of the master battery pack itself and the switch components 121 of the N-1 slave battery packs to open or close based on the data of the master battery pack and the data of the slave battery pack.

[0079] Through the above technical solution, the main battery pack controls the opening or closing of the switch components 121 of the N battery packs 100, thereby ensuring the consistency of the actions of the switch components 121 of the N battery packs 100 and reducing the risk of missing the opportunity for parallel connection.

[0080] In one or more embodiments of the present application, the first connector 130 of each battery pack 100 also includes a second pin 134, and the second pin 134 is configured to communicate with the electronic device through a second communication harness 140; the processor of the main battery pack is also configured to transmit data of N battery packs 100 to the charging device 150 and / or discharging device 160 of the electronic device through the second communication harness 140.

[0081] Through the above technical solution, when the battery pack parallel system 800 communicates with the electronic device, the main battery pack transmits the data of N battery packs 100 to the electronic device through the second communication harness 140. In the battery pack parallel system 800, the main battery pack has obtained the data of all battery packs 100 and performs control operations based on these data, such as controlling the opening or closing of the slave battery pack switch assembly. This simplifies the secondary processing of the battery pack data by the electronic device, reduces the re-judgment of the electronic device, and increases the adaptability of the battery pack parallel system to different types of electronic devices.

[0082] Based on the battery pack parallel system provided in the above embodiment, the present application also provides an embodiment of an electronic device, which is described in detail below with reference to the accompanying drawings.

[0083] See also Fig. 9 , is a schematic diagram of an electronic device provided in some embodiments of the present application, such as Fig. 9 As shown, the electronic device 900 includes Figure 8-Figure 9 The battery pack parallel system 800 described in any embodiment, the electronic device 900 further includes: a second communication harness 140 and N second connectors 910. The second communication harness 140 is connected to the second pin 134 of each battery pack 100 in the battery pack parallel system 800, and each second connector 910 is connected to the first connector 130 of each battery pack 100.

[0084] Here, the second connector 910 is a connector that cooperates with the first connector 130. Exemplarily, if the first connector 130 is a socket, the second connector 910 is a plug used in conjunction with the socket; if the first connector 130 is a plug, the second connector 910 is a socket used in conjunction with the socket.

[0085] Through the above technical solution, the battery pack parallel system 800 is connected to the electronic device through the second connector 910. The N battery packs 100 in the battery pack parallel system 800 can realize the expansion of the capacity and power of the battery system in the electronic device. When multiple battery packs 100 are parallel, different battery packs 100 can communicate through the first communication harness 180, which is convenient for determining whether the multiple battery packs 1800 meet the parallel conditions, reducing or reducing the battery circulation, and improving the reliability of the battery pack parallel. In addition, the battery packs 100 communicate through the first communication harness 180, and the first communication harness 180 is a single communication line. Compared with CAN communication and 485 communication, the number of communication lines required is less, the number of pins matched with the communication line is less, and the communication circuit is simpler, which reduces the cost of the battery pack. The battery pack 100 communicates with the electronic device 900 through the second communication harness 140, and the second communication harness 140 is a single communication line. Compared with CAN communication and 485 communication, the number of communication lines required is less, the number of pins matched with the communication line is less, and the communication circuit is simpler, which reduces the cost of the electronic device. In addition, the first pin 133 of the battery pack 100 is connected to the first pin 133 of other battery packs 100 through the first communication harness 180. When the switch assembly 121 of the battery pack 100 is in the disconnected state, the battery pack 100 can still transmit data with other battery packs 100 through the first communication harness 180, thereby realizing communication between the battery packs 100, thereby improving the reliability of parallel battery pack operation.

[0086] In one or more embodiments of the present application, the electronic device 900 further includes N battery pack identification circuits, each of which includes: Figure 6 The first pull-up resistor 170, the first pull-down resistor 124 and the power supply VCC are shown, one end of the first pull-down resistor 124 is electrically connected to the power supply VCC through the first pull-up resistor 170, and the other end of the first pull-down resistor 124 is connected to the negative output terminal 132 of the battery pack 100. Figure 6 As shown, the first pull-up resistor 170 and the power source VCC are provided in the electronic device, and the first pull-down resistor 124 is provided in the battery pack 100. Among the N battery pack identification circuits, the resistance values ​​of the first pull-up resistor 170 in different battery pack identification circuits are different.

[0087] By configuring first pull-up resistors 170 with different resistance values ​​for different battery pack identification circuits, the battery pack 100 can be identified as a master battery pack or a slave battery pack based on the resistance value of the first pull-down resistor 124 therein and the resistance value of the first pull-up resistor 170 connected thereto.

[0088] In one or more embodiments of the present application, the electronic device 900 includes a discharge device 160, including N battery accommodating cavities, and the battery accommodating cavities are used to accommodate a battery pack 100 and a second connector 910. A battery pack 100 and a second connector 910 connected to a first connector 130 of the battery pack 100 are arranged in one battery accommodating cavity, and different battery packs 100 are arranged in different battery accommodating cavities.

[0089] Through the above technical solution, different battery packs 100 can be placed in different battery accommodating cavities. In this way, the master battery pack and the slave battery pack can be distinguished by the battery accommodating cavities where the battery packs 100 are located.

[0090] In one or more embodiments of the present application, the electronic device 900 includes a charging device 150, and the charging device 150 includes a charger and an adapter plug; one end of the adapter plug is configured to be connected to N second connectors 910 respectively, and the other end of the adapter plug is configured to be connected to the charger.

[0091] Based on the electronic device provided in the above embodiment, the present application also provides an embodiment of a battery pack parallel connection method, which is described in detail below with reference to the accompanying drawings.

[0092] See also Fig.10 , is a flow chart of a battery pack parallel connection method provided in some embodiments of the present application, which is applied to the above-mentioned Fig. 9 The electronic device 900 shown in FIG. Fig.10 As shown, the method includes the following steps S110-S120.

[0093] S110. In response to N battery packs being awakened, the master battery pack obtains data of N-1 slave battery packs through the first communication harness.

[0094] Here, the N battery packs refer to the N battery packs 100 included in the battery pack parallel system 800 in the electronic device, and the N battery packs 100 are divided into a master battery pack and N-1 slave battery packs.

[0095] The first communication harness 180 is a single communication line, which uses half-duplex communication for data transmission. The main battery pack communicates with only one slave battery pack at the same time. Based on this, when the number of slave battery packs N-1 is greater than 1, the main battery pack can periodically obtain the data of each slave battery pack in a time-sharing manner. The number of cycles corresponds to the N-1 slave battery packs, that is, the main battery pack obtains the data of the N-1 slave battery packs in N-1 cycles in sequence. For example, the N-1 slave battery packs include battery pack 1, battery pack 2...battery pack N-1, then the main battery pack can obtain the data of battery pack 1 in the first cycle, obtain the data of battery pack 2 in the second cycle, and so on, until the data of battery pack N-1 is obtained in the N-1th cycle.

[0096] S120. The master battery pack controls the switch components of the master battery pack and the switch components of the N-1 slave battery packs to open or close according to the data of the master battery pack and the data of the N-1 slave battery packs.

[0097] Here, the master battery pack determines whether the master battery pack and the slave battery pack meet the preset parallel condition based on the data of the master battery pack itself and the data of the N-1 slave battery packs, and controls the switch components of the master battery pack and / or the switch components of the N-1 slave battery packs to be turned on or off according to the judgment result. The parallel condition can be preset according to actual conditions.

[0098] Exemplarily, the parallel conditions include one or more of the following:

[0099] Neither the battery pack to be incorporated nor the battery pack already incorporated has triggered a fault;

[0100] The absolute value of the difference between the open circuit voltage of the battery pack to be incorporated and the open circuit voltage of the already incorporated battery pack is less than the first voltage threshold, and the open circuit voltage of the already incorporated battery pack is the minimum open circuit voltage or the maximum open circuit voltage in the battery parallel system;

[0101] The temperature of the battery pack to be incorporated and the temperature of the battery pack already incorporated are both within a preset temperature range, and the preset temperature range is pre-set according to actual needs.

[0102] For each battery pack 100 among the N battery packs 100, when the main battery pack determines based on the data of the battery pack 100 that the battery pack 100 meets the parallel condition, the main battery pack controls the switch component of the battery pack 100 to open, and the battery pack is charged and discharged. When it is determined based on the data of the battery pack 100 that the battery pack 100 does not meet the parallel condition, the main battery pack controls the switch component of the battery pack 100 to disconnect, and the battery pack 100 stops charging and discharging.

[0103] Through the above technical solution, when N battery packs 100 are connected in parallel, N-1 slave battery packs transmit their own data to the master battery pack through the first communication harness 180, so that the master battery pack can determine whether the N battery packs 100 meet the conditions for connection based on the data of the N battery packs 100, reduce or lower the battery circulation, improve the reliability of the battery pack connection, and control the switch assembly 121 of each battery pack 100 through the master battery pack to ensure the consistency of the operation of the switch assembly 121 of multiple battery packs 100, thereby reducing the risk of missing the opportunity for connection. Moreover, the battery packs 100 communicate with each other through the first communication harness 180, which is a single communication line. Compared with CAN communication and 485 communication, the number of communication lines required is less, the number of pins matched with the communication lines is less, and the communication circuit is simpler, thereby reducing the cost of the battery pack. In addition, by setting a first communication harness 180 between the battery packs 100, when the switch assembly 121 of the battery pack 100 is in the disconnected state, the battery pack 100 can still transmit data with other battery packs 100 through the first communication harness 180, thereby realizing communication between the battery packs 100, thereby improving the reliability of parallel connection of the battery packs.

[0104] In one or more embodiments of the present application, in the above step S111, the master battery pack acquires data of N-1 slave battery packs through the first communication harness, including:

[0105] The master battery pack sends a first message to each slave battery pack, and receives a second message sent by each slave battery pack.

[0106] Here, the first message contains the data of the master battery pack, the corresponding control instructions of the slave battery pack, and instructions for instructing the slave battery pack to reply to the message, and the control instructions are used to control the switch component of the slave battery pack to open or close; the second message contains the data of the slave battery pack.

[0107] There is a single-line communication between the master battery pack and the slave battery pack. There are two schemes for the master battery pack to send a first message and N-1 slave battery packs to reply to a second message. The following is an example of N-1 slave battery packs, namely battery pack 1, battery pack 2...battery pack N-1.

[0108] The first solution: the main battery pack sends the first message to battery pack 1 in the first cycle, and battery pack 1 replies with a second message to the main battery pack after receiving the first message. Then the main battery pack sends the first message to battery pack 2 in the second cycle, and battery pack 2 replies with a second message to the main battery pack after receiving the first message, and so on, until the main battery pack sends the first message to battery pack N-1 in the N-1th cycle, and battery pack N-1 replies with a second message to the main battery pack after receiving the first message. The cycle length can be set to 300ms or 500ms, and the cycle length is positively correlated with the length of the message.

[0109] The second solution is that the main battery pack sends the first message to battery pack 1 in the first cycle, and the main battery pack sends the first message to battery pack 2 in the second cycle, ..., until the main battery pack sends the first message to battery pack N-1 in the N-1th cycle, and then battery pack 1 replies with the second message to the main battery pack at time t1, and battery pack 2 replies with the second message to the main battery pack at time t2 after Δt1, and so on, after ΔtN-2, at time tN-1, battery pack N-1 replies with the second message to the main battery pack at time tN-1. Among them, the length of each Δt needs to ensure that the second message from the battery pack is sent.

[0110] In one or more embodiments of the present application, the method also includes: in response to the main battery pack being awakened, the main battery pack receives a query request sent by the electronic device through the second communication harness, and sends the data of the main battery pack and the data of N-1 slave battery packs to the electronic device.

[0111] When N battery packs 100 are connected in parallel, the charging device 150 or discharging device 160 of the electronic device sends a query request to the main battery pack to instruct the main battery pack to send the data of the N battery packs 100 to the charging device 150 or discharging device 160. In this way, the charging device 150 or discharging device 160 can comprehensively determine the allowable charging current, discharging current, charging power, discharging power, fault status and other information based on the data of the N battery packs 100 sent by the main battery pack, thereby improving the reliability of the battery pack connection.

[0112] Through the above technical solution, when the battery pack parallel system 800 communicates with the electronic device 900, the main battery pack transmits the data of N battery packs 100 to the electronic device through the second communication harness 140. In the battery pack parallel system 800, the main battery pack has obtained the data of all battery packs 100 and performs control operations based on these data, such as controlling the opening or closing of the switch assembly of the slave battery pack. This simplifies the secondary processing of the battery pack data by the electronic device, reduces the re-judgment of the electronic device, and increases the adaptability of the battery pack parallel system to different types of electronic devices.

[0113] In one or more embodiments of the present application, the method also includes: for each of the N battery packs, in response to the battery pack being connected to an electronic device, the battery pack determines whether the battery pack is a master battery pack or a slave battery pack based on the resistance value of a first pull-down resistor in the battery pack and the resistance value of a first pull-up resistor in the electronic device connected to the battery pack.

[0114] For determining whether a battery pack is a master battery pack or a slave battery pack based on the resistance value of the first pull-down resistor and the resistance value of the first pull-up resistor, reference can be made to the relevant description in the above embodiments, and will not be elaborated here to avoid repetition.

[0115] Through the above technical solution, each battery pack 100 can determine whether it is a master battery pack or a slave battery pack based on its own first pull-down resistor 124 and the resistance value of the first pull-up resistor 170 connected thereto in the electronic device.

[0116] In addition, in combination with the battery pack parallel connection method in the above embodiment, the embodiment of the present application can provide a computer storage medium for implementation. The computer storage medium stores computer program instructions; when the computer program instructions are executed by the processor, any one of the battery pack parallel connection methods in the above embodiment is implemented.

[0117] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0118] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present application are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0119] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0120] Aspects of the present disclosure are described above with reference to the flowchart and / or block diagram of the method, device (system) and computer program product according to the embodiment of the present disclosure. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the function / action specified in one or more boxes of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It can also be understood that each box in the block diagram and / or flowchart and the combination of boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs a specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0121] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

Claims

1. A battery pack, comprising: A battery cell assembly, a battery management unit electrically connected to the battery cell assembly, and a first connector electrically connected to the battery management unit, wherein the battery management unit includes a processor and a switch assembly, and the first connector includes a positive output terminal and a negative output terminal; characterized in that: The switch assembly is arranged between the negative electrode of the battery cell assembly and the negative electrode output terminal; The first connector further includes a first pin, the first pin is connected to the processor, and the first pin is also configured to be connected to the first pin of the other battery pack through a first communication harness; The processor is configured to transmit data with the other battery packs via the first communication harness in a half-duplex communication manner.

2. The battery pack according to claim 1, characterized in that: The first connector further includes a second pin connected to the processor, the second pin further configured to be communicatively connected to the electronic device via a second communication harness; The processor is further configured to transmit data with the electronic device via the second communication harness in a half-duplex communication manner.

3. The battery pack according to claim 2, characterized in that: The first connector further includes a third pin connected to the processor, and the processor is configured to determine that the battery pack is connected to a charging device in the electronic device through the third pin; and / or, The first connector further includes a fourth pin connected to the processor, and the processor is configured to determine, through the fourth pin, that the battery pack is connected to a discharge device in the electronic device.

4. The battery pack according to claim 3, characterized in that: The battery management unit includes a first pull-down resistor electrically connected to the negative output terminal, the first pull-down resistor being configured to be electrically connected to a first pull-up resistor in the electronic device; The processor is configured to determine, in response to the battery pack being connected to the electronic device, whether the battery pack is a master battery pack or a slave battery pack based on a resistance value of the first pull-down resistor and a resistance value of the first pull-up resistor.

5. The battery pack according to any one of claims 1 to 4, characterized in that: The battery management unit also includes a data acquisition unit, which is communicatively connected to the processor and configured to acquire data of the battery pack.

6. A battery pack parallel system, characterized in that: include: N battery packs as claimed in claim 1, the N battery packs are configured to be connected in parallel, and N is a positive integer greater than or equal to 2; A first communication harness is configured to be connected to a first pin of each of the battery packs, wherein the first communication harness is a single communication harness; The N battery packs are configured to transmit data via the first communication harness in a half-duplex communication manner.

7. The battery pack parallel system according to claim 6, characterized in that: The N battery packs include a master battery pack and N-1 slave battery packs; The processor of the master battery pack is further configured to control the switch component of the slave battery pack to be turned on or off based on the data of the master battery pack and the data of the slave battery pack.

8. The battery pack parallel system according to claim 7, characterized in that: The first connector of each battery pack includes a second pin connected to the processor, and the second pin is configured to be communicatively connected to the electronic device through a second communication harness; The processor of the main battery pack is also configured to transmit data to the electronic device through the second communication harness in a half-duplex communication manner.

9. An electronic device, characterized in that: A battery pack parallel system comprising any one of claims 6 to 8; The first connector includes a second pin, the electronic device includes a second communication harness, and the second communication harness is connected to the second pin of each battery pack; N second connectors, each of the second connectors is connected to the first connector of each of the battery packs.

10. The electronic device according to claim 9, characterized in that: The electronic device further comprises: N battery pack identification circuits, each of the battery pack identification circuits comprising a first pull-up resistor, a first pull-down resistor and a power supply, one end of the first pull-down resistor being electrically connected to the power supply through the first pull-up resistor, and the other end of the first pull-down resistor being electrically connected to the negative output terminal; The first pull-up resistor and the power supply are provided in the electronic device, and the first pull-down resistor is provided in the battery pack; Among the N battery pack identification circuits, the resistance values ​​of the first pull-up resistors in different battery pack identification circuits are different.

11. The electronic device according to claim 9 or 10, characterized in that: The electronic device includes a discharge device, the discharge device includes N battery accommodating cavities, and the battery pack and the second connector are arranged in the battery accommodating cavities.

12. The electronic device according to claim 9 or 10, characterized in that: The electronic device comprises a charging device, and the charging device comprises a charger and a conversion plug; One end of the adapter plug is configured to be connected to the N second connectors respectively, and the other end of the adapter plug is configured to be connected to the charger.

13. A battery pack parallel connection method, applied to the battery pack parallel connection system electronic device according to any one of claims 9 to 12, characterized in that: The method comprises: In response to N battery packs being awakened, the master battery pack acquires data of N-1 slave battery packs through the first communication harness; The master battery pack controls the switch components of the master battery pack and the switch components of the slave battery packs to turn on or off according to the data of the master battery pack and the data of the N-1 slave battery packs.

14. The battery pack parallel connection method according to claim 13, characterized in that: The master battery pack acquires data of N-1 slave battery packs through the first communication harness, including: The master battery pack sends a first message to each of the slave battery packs, and receives a second message sent by each of the slave battery packs; The first message includes data of the master battery pack, control instructions for the slave battery pack, and instructions for instructing the slave battery pack to reply to a message, and the control instructions include instructions for controlling the switch component of the slave battery pack to open or close; The second message includes data of the slave battery pack.

15. The battery pack parallel connection method according to claim 12, characterized in that: The method further comprises: In response to the master battery pack being awakened, the master battery pack receives the query request sent by the electronic device through the second communication harness, and sends the data of the master battery pack and the data of the N-1 slave battery packs to the electronic device.

16. The battery pack parallel connection method according to any one of claims 13 to 15, characterized in that: The method further comprises: For each of the N battery packs, in response to the battery pack being connected to the electronic device, the battery pack is determined to be a master battery pack or a slave battery pack based on the resistance value of a first pull-down resistor in the battery pack and the resistance value of a first pull-up resistor in the electronic device.

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