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, the battery management unit comprises a processor and a switch assembly, and the first connector comprises a positive electrode output terminal; the switch assembly is arranged between the positive electrode of the battery cell assembly and the positive electrode output terminal; the first connector comprises a first pin, the first pin is connected with the processor, the first pin is configured to be in communication connection with electronic equipment through a first communication wire harness, and the processor is configured to transmit data with the electronic equipment 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 the 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 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 will 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 connection 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 adapted to CAN communication and 485 communication are more complicated. However, these are not friendly to the pursuit of low-cost battery parallel connection solutions.

[0006] Based on this, in 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; the switch assembly is arranged between the positive electrode of the battery cell assembly and the positive output terminal; the first connector comprises a first pin, the first pin is connected to the processor, the first pin is configured to communicate with the electronic device through a first communication harness, and the processor is configured to transmit data with the electronic device using a half-duplex communication method through the first communication harness.

[0007] Through the above technical solution, when multiple battery packs are connected in parallel, each battery pack can obtain the data of other battery packs through the first communication harness, which is convenient for determining whether multiple battery packs meet the conditions for parallel connection, reducing or lowering the battery circulation, and improving the reliability of battery pack parallel connection. Moreover, the battery pack communicates with the electronic device 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 less, the number of pins connected to the communication line is less, and a simpler communication circuit is used, thereby reducing the cost of the battery pack and the electronic device. In addition, by setting the switch assembly between the positive electrode and the positive output terminal of the battery cell assembly, when the switch assembly of the battery pack is in the disconnected state, the battery packs maintain communication with each other through the first harness, and the battery packs maintain communication with the electronic device through the first communication harness, thereby improving the reliability of battery pack parallel connection.

[0008] In one or some embodiments of the present application, the first connector also includes a second pin connected to the processor, and the processor is configured to determine the connection of a charging device connected to the battery pack and the electronic device through the second pin; and / or, the first connector also includes a third pin connected to the processor, and the processor is configured to determine the connection of a discharging device connected to the battery pack and the electronic device through the third pin.

[0009] 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.

[0010] In one or some embodiments of the present application, the first connector also includes a negative output terminal, which is connected to the negative electrode of the battery cell assembly; the battery management device 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 the first pull-up resistor of the electronic device; the processor is configured to determine the battery receiving cavity in which the battery pack is located in response to the battery pack being connected to the electronic device based on the resistance value of the first pull-down resistor and the resistance value of the first pull-up resistor.

[0011] Through the above technical solution, the battery pack can determine the battery receiving cavity where the battery pack is located based on the resistance value of the first pull-down resistor and the resistance value of the first pull-up resistor.

[0012] In one or some embodiments of the present application, the battery management unit also includes a data acquisition unit, which is communicatively connected to the processor and configured to collect data of the battery pack.

[0013] 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 connected in parallel, and N is a positive integer greater than or equal to 2; the processors of the N battery packs are configured to transmit data with the electronic device in a half-duplex communication manner via a first communication harness.

[0014] Through the above technical solution, when multiple battery packs are connected in parallel, each battery pack can obtain the data of other battery packs through the first communication harness, which is convenient for determining whether multiple battery packs meet the conditions for parallel connection, reducing or lowering the battery circulation, 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 connected to the communication line is less, and a simpler communication circuit is used, thereby reducing the cost of battery packs and electronic devices. In addition, by setting the switch assembly between the positive electrode and the positive output terminal of the battery cell assembly, when the switch assembly of the battery pack is in the disconnected state, the battery packs maintain communication with each other through the first harness, and the battery packs maintain communication with the electronic device through the first communication harness, thereby improving the reliability of battery pack parallel connection.

[0015] In one or more embodiments of the present application, the processor of each battery pack is configured to receive a query request sent by an electronic device through a first communication harness, send battery pack data to the electronic device, obtain data of other battery packs, and control the switch component of the battery pack to open or close based on the data of N battery packs.

[0016] Through the above technical solution, each battery pack can control its own switch component to open or close according to the data of N parallel battery packs, which can reduce the risk of circulating current caused by battery parallel connection and improve the reliability of battery pack parallel connection.

[0017] In a third aspect, an embodiment of the present application provides an electronic device, including a battery pack parallel system as in the second aspect, a first communication harness configured to connect to a first pin of each battery pack and the electronic device, the first communication harness being a single communication harness; and N second connectors, each second connector being connected to the first connector of each battery pack.

[0018] Through the above technical solution, the connection between the battery pack parallel system and the electronic device is realized through the second connector and the first communication harness. 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, each battery pack can obtain the data of other battery packs 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 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 connected to the communication line is less, and a simpler communication circuit is used, which reduces the cost of the battery pack and the electronic device. In addition, by setting the switch assembly between the positive electrode and the positive output terminal of the battery cell assembly, when the switch assembly of the battery pack is in the disconnected state, the battery packs maintain communication with the battery packs through the first harness, and the battery packs maintain communication with the electronic device through the first communication harness, thereby improving the reliability of the battery pack parallel.

[0019] In one or more embodiments of the present application, the electronic device further includes a discharge device, the discharge device includes N battery accommodating cavities, and the battery pack and the second connector are disposed in the battery accommodating cavities.

[0020] Through the above technical solution, different battery packs can be placed in different battery accommodating cavities, so that different battery packs can be distinguished by the battery accommodating cavities in which the battery packs are located.

[0021] 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 connected to the negative output terminal of the first connector, 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.

[0022] Through the above technical solution, the battery pack can determine the battery receiving cavity where the battery pack is located based on the resistance value of the first pull-down resistor and the resistance value of the first pull-up resistor.

[0023] 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.

[0024] In a fourth aspect, an embodiment of the present application provides a battery pack parallel connection 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, each battery pack receives a query request sent by the electronic device through a first communication harness, and sends the battery pack data to the electronic device; each battery pack obtains the data of other battery packs through the first communication harness; each battery pack controls the switch component of the battery pack to open or close according to the data of the N battery packs.

[0025] Through the above technical solution, when multiple battery packs are connected in parallel, each battery pack can obtain the data of other battery packs through the first communication harness, which is convenient for determining whether multiple battery packs meet the parallel conditions, reducing or lowering the battery circulation, 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 connected to the communication line is less, and a simpler communication circuit is used, thereby reducing the cost of the battery pack. In addition, by setting the switch assembly between the positive electrode and the positive output terminal of the battery cell assembly, when the switch assembly of the battery pack is in the disconnected state, the battery packs maintain communication with each other through the first harness, and the battery packs maintain communication with the electronic device through the first communication harness, thereby improving the reliability of battery pack parallel connection.

[0026] In one or some embodiments of the present application, the method further comprises:

[0027] For each of the N battery packs, in response to the battery pack being awakened, the battery receiving cavity in which the battery pack is located is determined based on the resistance value of the first pull-up resistor and the resistance value of the first pull-down resistor.

[0028] Through the above technical solution, the battery pack can determine the battery receiving cavity where the battery pack is located based on the resistance value of the first pull-down resistor and the resistance value of the first pull-up resistor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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.

[0030] Figure 1 is a schematic diagram of a battery pack provided in an embodiment of the present application;

[0031] Figure 2 is a schematic diagram of a first connector provided in an embodiment of the present application;

[0032] Figure 3 is a schematic diagram of a battery pack provided in an embodiment of the present application;

[0033] Figure 4 is a schematic diagram of a battery pack provided in an embodiment of the present application;

[0034] Figure 5 is a schematic diagram of a battery pack provided in an embodiment of the present application;

[0035] Figure 6 is a schematic diagram of a battery pack provided in an embodiment of the present application;

[0036] Figure 7 is a schematic diagram of a battery pack provided in an embodiment of the present application;

[0037] Figure 8 is a schematic diagram of a battery pack parallel system provided in an embodiment of the present application;

[0038] Fig. 9 is a schematic diagram of an electronic device provided in an embodiment of the present application;

[0039] Fig.10 It is a flow chart of the battery pack parallel connection method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] For ease of understanding, the professional terms in the embodiments of the present application are explained.

[0043] 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.

[0044] 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: a single signal line is used for data transmission. This communication mode allows data to be transmitted in both directions, but only allows signals to be transmitted in one direction at the same time.

[0045] The battery pack, battery pack parallel system, electronic device and battery pack parallel method provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in combination with the accompanying drawings.

[0046] 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.

[0047] 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 1 As 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, and 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 positive electrode of the battery cell assembly 110 and the positive output terminal 131. The first connector 130 further includes a first pin 133, the first pin 133 is connected to the processor 122, and the first pin 133 is configured to communicate with the electronic device through the first communication harness; wherein the first communication harness is a single communication line, and the processor 122 is configured to transmit data with the electronic device in a half-duplex communication manner through the first communication harness 180.

[0048] The battery cell assembly 110 includes one or more single cells. When the battery cell assembly 10 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 means that the connection between the single cells includes both series connection and parallel connection.

[0049] The switch component 121 includes a charging switch and a discharging switch. For example, the charging switch and the discharging switch include MOSFETs.

[0050] In some embodiments, the first connector 130 includes a socket. For example, the first connector 130 includes Figure 2 Socket shown.

[0051] 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.

[0052] In some embodiments, such as Figure 3 As shown, after the first connector 130 of the battery pack 100 and the second connector 910 in the electronic device are plugged in, the first pin 133 on the first connector 130 is connected to the first communication harness 920 in the electronic device through the second connector 910. In this way, the electronic device communicates with the battery pack 100 through the first communication harness 920. The first communication harness 920 is a single communication harness, for example, the first communication harness 920 is a communication bus in the electronic device. Figure 3 As 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.

[0053] Multiple electronic devices are provided. Figure 1 The battery pack 100 shown in FIG. 1 is connected in parallel to expand the capacity and power of the battery system. Figure 1 When the battery packs 100 shown are connected in parallel, each battery pack 100 communicates with the electronic device through the first communication harness 920 and sends its own data to the electronic device. When each battery pack 100 sends data to the electronic device, other battery packs 100 obtain the data sent by the battery pack 100 through the first communication harness 920. In this way, each battery pack 100 obtains the data of other battery packs 100. In this way, each battery pack 100 can determine whether it meets the parallel connection conditions based on its own data and the data of other battery packs 100, thereby reducing or lowering the battery circulation current caused by parameter differences or faults, and improving the reliability of battery pack parallel connection.

[0054] 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 positive electrode of the battery cell assembly 110 and the positive output terminal 131 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 positive electrode of the battery cell assembly 110 and the positive output terminal 131 is turned on, and the battery pack 100 is charged and discharged. In this embodiment, the battery pack 100 transmits data through a loop composed of the battery cell assembly 110, the processor 122, the first connector 130 and the negative electrode of the battery cell assembly 110. By setting the switch assembly 121 between the positive electrode of the battery cell assembly 110 and the positive output terminal 131, when the switch assembly 121 is disconnected, the battery pack 100 communicates with the electronic device through the loop composed of the battery cell assembly 110, the processor 122, the first connector 130 and the negative electrode of the battery cell assembly 110. Compared with setting the switch assembly 121 between the negative electrode of the battery cell assembly 110 and the negative output terminal 132, the communication interruption caused by the disconnection of the switch assembly 121 is improved, and the problems of battery circulation and battery pack parallel failure caused by communication interruption are reduced, thereby improving the reliability of battery pack parallel operation.

[0055] In one or more embodiments of the present application, the electronic device 900 includes a charging device, and the processor 122 is configured to detect that the electronic device connected to the battery pack 100 is a charging device 150 .

[0056] like Figure 4 As shown, the first connector 130 includes, in addition to the first pin 133, a second pin 134 connected to the processor 122, and the second pin 134 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 can receive the access signal from the charging device 150 through the second pin 134. Based on this, the processor 122 is configured to determine whether the battery pack 100 is connected to the charging device 150 through the second pin 134. Specifically, when the processor 122 receives the access signal from the charging device 150 through the second pin 134, it determines that the battery pack 100 is connected to the charging device.

[0057] 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 .

[0058] like Figure 4As shown, 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. The third pin 135 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 third pin 135. Based on this, the processor 122 is configured to determine whether the battery pack 100 is connected to the discharge device 160 through the third pin 135. Specifically, when the processor 122 receives the access signal of the discharge device through the third pin 135, it determines that the battery pack 100 is connected to the discharge device.

[0059] 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 .

[0060] 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.

[0061] In one or more embodiments of the present application, the electronic device includes a discharge device 160, and the discharge device 160 includes a plurality of battery receiving cavities for placing the battery pack 100 and the second connector 910, and first pull-up resistors 170 with different resistance values ​​are arranged in different battery receiving cavities. 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 supply VCC, for example, the power supply VCC is a voltage source with a voltage of 5V, and the first pull-down resistor 124 is electrically connected to the power supply 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 also configured to determine that the battery pack 100 is connected to the electronic device in response to an electrical signal received based on the second pin 134 or the third pin 135, and determine the battery receiving cavity where the battery pack 100 is located based on the resistance value of the first pull-down resistor 124 and the resistance value of the first pull-up resistor 170.

[0062] Through the above technical solution, different battery packs can be placed in different battery accommodating chambers, so that different battery packs can be distinguished by the battery accommodating chambers in which the battery packs are located. In addition, since the relative position of the battery accommodating chamber in the electronic device is unchanged, the battery pack 100 in the electronic device can be positioned by the battery accommodating chamber in which the battery pack 100 is located, and its position in the electronic device can be determined, so as to facilitate the removal or replacement of the battery pack 100.

[0063] 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 the battery receiving cavity where the battery pack 100 is located.

[0064] 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 battery receiving cavity where the first battery pack is located is the first battery receiving cavity, and the processor 122 of the second battery pack determines that the battery receiving cavity where the second battery pack is located is the second battery receiving cavity.

[0065] Through the above technical solution, the second pin 134 and the third pin 135 can be used not only to detect whether the battery pack 100 is connected to the electronic device, but also to identify the battery housing cavity where the battery pack 100 is located. 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.

[0066] In one or more embodiments of the present application, see Figure 7The 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.

[0067] 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.

[0068] 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 7 The battery pack 100 shown in the figure, wherein N battery packs 100 are connected in parallel, N is a positive integer greater than or equal to 2, for ease of description, Figure 8 Take N as 2 as an example. The first pin 133 of each battery pack 100 is connected to the electronic device through the first communication harness 920. The first communication harness 920 is a single communication harness. The processors 122 of the N battery packs 100 are configured to transmit data with the electronic device through the first communication harness 920 in a half-duplex communication manner.

[0069] Through the above technical solution, when multiple battery packs 100 are connected in parallel, each battery pack 100 can obtain the data of other battery packs 100 through the first communication harness 920, which is convenient for determining whether multiple battery packs 100 meet the conditions for parallel connection, reducing or lowering the battery circulation, and improving the reliability of battery pack parallel connection. Moreover, the battery pack 100 communicates with the electronic device through the first communication harness 920. The first communication harness 920 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 and the electronic device. In addition, by setting the switch assembly 121 between the positive electrode of the battery cell assembly 110 and the positive output terminal 131, when the switch assembly 121 of the battery pack 100 is in the disconnected state, the battery pack 100 can still communicate between battery packs and communicate with the electronic device through the first communication harness 920, thereby improving the reliability of battery pack parallel connection.

[0070] In one or more embodiments of the present application, the processor of each battery pack 100 is configured to receive a query request sent by an electronic device through a first communication harness 920, send data of the battery pack 100 to the electronic device, and obtain data of other battery packs 100, and control the switch assembly 121 of the battery pack 100 to open or close based on the data of N battery packs 100.

[0071] Through the above technical solution, each battery pack 100 can control its own switch component to open or close according to the data of N parallel battery packs. In this way, when there is a risk of parallel current, the switch component 121 can be disconnected in time, thereby reducing the battery circulation and improving the reliability of parallel connection of the battery packs.

[0072] In some embodiments, when multiple battery packs 100 are connected in parallel, the electronic device periodically sends query requests to each battery pack 100 in a time-sharing manner, and the query requests are used to indicate the acquisition of data of the battery pack 100. When each battery pack 100 receives the corresponding query request, it sends its own data to the electronic device through the first communication harness 920. When the battery pack 100 sends data to the electronic device, other battery packs 100 connected to the electronic device through the first communication harness 920 can obtain the data sent by the battery pack 100. In this way, each battery pack 100 in the battery pack parallel system 800 can obtain the data of the other N-1 battery packs 100, and thus control its own switch component 121 to open or disconnect based on the acquired data of the other N-1 battery packs 100 and its own data.

[0073] In addition, after the electronic device obtains the data of N battery packs 100, it can determine the charging current, discharging current, charging power, discharging power, fault status and other information allowed when the battery packs are connected in parallel based on the data of the N battery packs 100 to improve the effect of parallel connection of the battery packs.

[0074] 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.

[0075] 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 8In the battery pack parallel system 800 described in the embodiment, the electronic device 900 further includes: a first communication harness 920 and N second connectors 910. The first pins of each battery pack 100 in the battery pack parallel system 800 are respectively connected to the electronic device through the first communication harness 920, and the first communication harness 920 is a single communication harness; each second connector 910 is configured to be connected to the first connector 130 of a battery pack 100, and different second connectors 910 are connected to different first connectors 130.

[0076] 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.

[0077] Through the above technical solution, the battery pack parallel system 800 is connected to the electronic device through the second connector 910 and the first communication harness 920. The N battery packs 100 in the battery pack parallel system 800 can expand the capacity and power of the battery system. When multiple battery packs 100 are connected in parallel, each battery pack 100 can obtain the data of other battery packs 100 through the first communication harness 920, which is convenient for determining whether multiple battery packs 100 meet the parallel conditions, reducing or lowering the battery circulation, and improving the reliability of the battery pack parallel connection. Moreover, the battery packs 100 communicate with each other through the first communication harness 920, and the first communication harness 920 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, which reduces the cost of battery packs and electronic devices. In addition, by setting the switch assembly 121 between the positive electrode of the battery cell assembly 110 and the positive output terminal 131, when the switch assembly 121 of the battery pack 100 is in the disconnected state, the battery pack 100 can still achieve communication between battery packs and communication with electronic devices through the first communication harness 920, thereby improving the reliability of battery pack parallel operation.

[0078] In one or more embodiments of the present application, the electronic device 900 includes a discharge device 160, and the discharge device 160 also includes N battery accommodating cavities, and the battery accommodating cavities are used to accommodate a battery pack 100 and a second connector 910. One battery accommodating cavity can accommodate one battery pack 100 and one second connector 910. In this way, different battery packs 100 can be placed in different battery accommodating cavities.

[0079] Through the above technical solution, different battery packs 100 can be placed in different battery receiving cavities, so that the battery packs 100 can be distinguished by the battery receiving cavities in which the battery packs 100 are located.

[0080] 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. The first pull-up resistor 170 and the power supply VCC are provided in the electronic device, one first pull-up resistor 170 corresponds to one battery receiving cavity in the electronic device, and the resistance values ​​of the first pull-up resistor 170 corresponding to different battery receiving cavities are different, 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 resistors 170 in different battery pack identification circuits are different.

[0081] By configuring first pull-up resistors 170 with different resistance values ​​for different battery receiving cavities, the battery pack 100 can identify the battery receiving cavity where the battery pack 100 is located based on the resistance value of the first pull-up resistor 170 connected thereto.

[0082] 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.

[0083] 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.

[0084] See also Fig.10 , is a flow chart of a battery pack parallel connection method provided in some embodiments of the present application, the method is applied to Fig. 9 The electronic device 900 in the embodiment shown is as follows: Fig.10 As shown, the method includes steps S110-S130.

[0085] S110. In response to the N battery packs being awakened, each battery pack receives a query request sent by the electronic device through the first communication harness, and sends the battery pack data to the electronic device.

[0086] Here, the query request is used to obtain the data of the battery pack 100. When the battery packs are connected in parallel, the electronic device periodically sends query requests to different battery packs 100 through the first communication harness 920. When the battery pack 100 obtains the query request corresponding to the battery pack 100 sent by the electronic device through the first communication harness 920, it transmits its own data to the electronic device through the first communication harness 920.

[0087] S120. Each battery pack obtains data of other battery packs through the first communication harness.

[0088] When each battery pack 100 in the battery pack parallel system 800 receives a corresponding query request, it sends its own data to the electronic device that issued the query request through the first communication harness 920. Based on the characteristics of the communication bus, the data transmitted in the first communication harness 920 can be obtained by all devices connected to it. Therefore, when the battery pack 100 sends its own data to the electronic device through the first communication harness 920, other battery packs 100 can obtain the data of the battery pack 100. In this way, each battery pack 100 in the battery pack parallel system 800 can obtain the data of other N-1 battery packs 100.

[0089] S130. Each battery pack controls the switch component of the battery pack to open or close according to the data of the N battery packs.

[0090] Here, each battery pack 100 can determine whether it meets the preset parallel condition based on its own data and the data of other N-1 battery packs 100, and control its own switch component to turn on or off according to the judgment result. The parallel condition can be set according to actual conditions.

[0091] Exemplarily, the parallel conditions include one or more of the following:

[0092] The battery pack 100 and other incorporated battery packs 100 do not trigger faults;

[0093] The difference between the power of the battery pack 100 and the power of other incorporated battery packs 100 is within a preset threshold range, and the preset threshold range is preset according to actual needs;

[0094] The voltage difference between the battery pack 100 and the voltage of other battery packs 100 incorporated therein is within a preset threshold range, and the preset threshold range is preset according to actual needs;

[0095] 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.

[0096] For each battery pack 100 among the N battery packs 100, when the battery pack 100 determines that it meets the parallel condition based on the data of the N battery packs 100, the battery pack 100 controls its own switch component 121 to open, and the battery pack 100 charges and discharges. When the battery pack 100 determines that it does not meet the parallel condition based on the data of the N battery packs 100, the battery pack 100 controls its own switch component to disconnect, and the battery pack 100 stops charging and discharging.

[0097] Through the above technical solution, when multiple battery packs 100 are connected in parallel, each battery pack 100 can obtain the data of other battery packs 100 through the first communication harness 920, which is convenient for determining whether multiple battery packs 100 meet the conditions for parallel connection, reducing or lowering the battery circulation, and improving the reliability of battery pack parallel connection. Moreover, the battery packs 100 communicate with each other through the first communication harness 920, and the first communication harness 920 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, which reduces the cost of the battery pack. In addition, by setting the switch assembly 121 between the positive electrode of the battery cell assembly 110 and the positive output terminal 131, 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 and electronic devices through the first communication harness 920, so as to realize communication between battery packs and between battery packs and between battery packs 100 and electronic devices, thereby improving the reliability of battery pack parallel connection.

[0098] In one or some embodiments of the present application, the method further includes: for each of the N battery packs, in response to the battery pack being awakened, determining the battery receiving cavity in which the battery pack is located based on the resistance value of the first pull-up resistor and the resistance value of the first pull-down resistor.

[0099] The method for determining the battery receiving cavity in which the battery pack is located based on the resistance value of the first pull-down resistor and the resistance value of the first pull-up resistor can be referred to the relevant description in the above embodiment. To avoid repetition, it will not be described in detail here.

[0100] Through the above technical solution, the battery pack 100 can determine the battery receiving cavity where the battery pack is located based on the resistance value of the first pull-down resistor and the resistance value of the first pull-up resistor.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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; characterized in that: The switch assembly is arranged between the positive electrode of the battery cell assembly and the positive electrode output terminal; The first connector includes a first pin, the first pin is connected to the processor, and the first pin is configured to be communicatively connected to the electronic device through a first communication harness; The processor is configured to transmit data with the electronic device 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, and the processor is configured to determine that the battery pack is connected to a charging device in the electronic device through the second pin; and / or, The first connector further includes a third pin connected to the processor, and the processor is configured to determine, through the third pin, that the battery pack is connected to a discharge device in the electronic device.

3. The battery pack according to claim 2, characterized in that: The first connector also includes a negative output terminal, and the negative output terminal is connected to the negative electrode of the battery cell assembly; The battery management device 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 of the electronic device; The processor is configured to determine, in response to the battery pack being connected to the electronic device, a battery receiving cavity in which the battery pack is located based on a resistance value of the first pull-down resistor and a resistance value of the first pull-up resistor.

4. The battery pack according to any one of claims 1 to 3, 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.

5. A battery pack parallel system, characterized in that: include: N battery packs as claimed in claim 1, the N battery packs are connected in parallel, and N is a positive integer greater than or equal to 2; The processors of the N battery packs are configured to transmit data with the electronic device in a half-duplex communication manner through the first communication harness.

6. The battery pack parallel system according to claim 5, characterized in that: The processor of each battery pack is configured to receive a query request sent by the electronic device through the first communication harness, send the data of the battery pack to the electronic device, obtain the data of other battery packs, and control the switch component of the battery pack to open or close based on the data of the N battery packs.

7. An electronic device, characterized in that: A battery pack parallel system as claimed in claim 5 or 6, A first communication harness is configured to be connected to a first pin of each battery pack and an electronic device, wherein the first communication harness is a single communication harness; N second connectors, each of the second connectors is connected to the first connector of each of the battery packs.

8. The electronic device according to claim 7, characterized in that: The electronic device further comprises a discharge device; The discharge device has N battery accommodating cavities, and the battery pack and the second connector are arranged in the battery accommodating cavities.

9. The electronic device according to claim 8, characterized in that: The electronic device further comprises a charging device; The charging device includes a charger and a conversion plug, one end of the conversion plug is configured to be connected to the N second connectors respectively, and the other end of the conversion plug is configured to be connected to the charger.

10. The electronic device according to any one of claims 7 to 10, 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 source, one end of the first pull-down resistor being electrically connected to the power source through the first pull-up resistor, and the other end of the first pull-down resistor being electrically connected to the negative output terminal of the first connector; 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. A battery pack parallel connection method, applied to the battery pack parallel connection electronic device according to any one of claims 7 to 10, characterized in that: The method comprises: In response to the N battery packs being awakened, each of the battery packs receives a query request sent by the electronic device through a first communication harness, and sends data of the battery pack to the electronic device; Each of the battery packs obtains data of other battery packs through the first communication harness; Each of the battery packs controls the switch component of the battery pack to be turned on or off according to the data of the N battery packs.

12. The battery pack parallel connection method according to claim 11, characterized in that: The method further comprises: For each of the N battery packs, in response to the battery pack being awakened, the battery receiving cavity in which the battery pack is located is determined based on the resistance value of the first pull-up resistor and the resistance value of the first pull-down resistor.

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