Modularized lithium battery pack

Abstract

The utility model discloses a modularized lithium battery pack which comprises a battery cell group, a battery management system, a battery plug connector, a state display module and a shell, the battery cell groups connected in series are managed by the battery management system to charge and discharge the outside through the battery plug connectors, and a charging port and a discharging port are separated and independent. Meanwhile, the plug connector is further provided with a communication port, a scene recognition port and a position recognition port, communication with external equipment is carried out through the communication port, single-battery and multi-battery scenes are recognized through the scene recognition port, and physical position recognition on the external equipment is carried out through the position port. The battery management system has the functions of battery cell sampling and monitoring, electric quantity balance management, heat balance management, communication module, data storage, alarm, charge and discharge management, logic control and the like. The state display module externally displays information such as real-time state and electric quantity of the battery. Therefore, the battery pack can be universally used in more use scenes (single batteries and multiple batteries) and equipment (energy storage cabinets, outdoor portable inverters, electric two-wheeled vehicles and the like), and the types and the number of the batteries are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, in particular to a modular lithium battery pack. Background Art

[0002] With the development of new energy technology and industry, taking automobiles as an example, new energy is being used in more and more scenarios to replace the original fossil energy. New energy mostly uses batteries as energy packs, so in the specific operation process, battery management circuits and devices are involved.

[0003] Existing lithium battery packs basically have the same charging and discharging ports, no communication function, no scene recognition function, and no location recognition function in the device. The application scenarios of this type of battery pack are limited, and it is not convenient to carry out fine management and upgrading of the battery through communication, and thus it is impossible to further improve the intelligence of battery use. Utility Model Content

[0004] In view of the above problems, the utility model provides a modular lithium battery pack. It includes: a battery cell group, a battery management system, a battery connector, a status display module and a shell; the battery cell group and the battery connector are both electrically connected to the battery management system; the battery cell group includes a plurality of battery cells connected in series; the battery management system includes at least a charge and discharge management module and a communication module; the charge and discharge management module is used to control the charge and discharge circuit of the battery; the communication module is used to communicate and transmit data and instructions with external devices; the connector includes a power port, a communication port, a scene recognition port and a position recognition port; the power port is used for charge / discharge circuit connection; the communication port is used for communication with external devices; the scene recognition port is used to identify single-battery and multi-battery application scenarios; the position recognition port is used to identify the physical position of the battery on the external device.

[0005] In some preferred embodiments, the power port includes a charging port and a discharging port that are independently arranged;

[0006] In some preferred embodiments, the battery management system also includes a cell balancing management module, a cell sampling & monitoring module, a thermal balance management module, a data storage module, an alarm module, and a logic control unit; the cell balancing management module is used to perform balancing management between cells; the cell sampling & monitoring module is used to monitor the cell status; the thermal balance management module is used to monitor the temperature of the battery pack and the circuit board in real time; the data storage module is used to store battery dynamic information; the alarm module is used to display the battery alarm information to the user by sound and light; the logic control unit is used to summarize the information of each module and perform logical judgment according to the set rules, and control the action of the components according to the judgment results.

[0007] In some preferred embodiments, the thermal balance management module detects the temperature of the battery cell via an NTC resistor.

[0008] In some preferred embodiments, the cell balancing management module performs balancing management between the cells by connecting resistors in parallel to the cell voltage sampling lines.

[0009] In some preferred embodiments, the cell sampling & monitoring module samples the voltage of a single cell through a single cell voltage sampling line, samples the current through the positive and negative electrodes of the cell group, and monitors the status of the cell in real time.

[0010] In some preferred embodiments, the alarm module displays the alarm information by controlling a buzzer and an LED light.

[0011] In some preferred embodiments, the communication module communicates with the external device via RS485 communication and CAN bus.

[0012] In some preferred embodiments, the status display module includes a plurality of colored LED lamp beads, and the colored LED lamp beads indicate the battery power through different brightness and the battery working status through different colors under the control of the battery management system.

[0013] In some preferred embodiments, the charging / discharging circuits are separated, both of which are bidirectional on-off controlled, and have a load and charging detection module, and the charging circuit is provided with a charging current limiting

[0014] In some preferred embodiments, the power port of the battery connector uses 3 power pins, the communication port uses 3 communication pins, the scene recognition port uses 1 scene pin, and the location recognition port uses 4 location recognition pins.

[0015] In some preferred embodiments, the number of colored LED lamp beads of the power status display module is 10, and the color and brightness of the lamp beads are displayed according to the logic of the battery management system under the control of the light board MCU.

[0016] Beneficial effects: The utility model uses a modular lithium battery pack, which can be used in more usage scenarios (single battery or multiple batteries) and devices (energy storage cabinets, outdoor portable inverters, electric two-wheeled vehicles, etc.) by setting independent charging and discharging ports, thereby reducing the types and number of batteries; the communication port can make the device's management of batteries safer and more intelligent; the location identification port can provide a basis for the device's refined management of batteries. For example, the accurate display of the battery's position in a multi-battery device in the APP, the accurate push of the battery when the user takes the battery, the accurate positioning of the problem battery, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of a lithium battery pack in one embodiment of the utility model.

[0018] Figure 2 It is a structural diagram of a plug connector in one embodiment of the utility model.

[0019] Figure 3 It is a functional block diagram of the battery management system in the utility model.

[0020] Figure 4 It is a functional block diagram of the independent charging and discharging circuit in the utility model.

[0021] Figure 5 It is a logic diagram for displaying the electric quantity status in the utility model. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0023] Please refer to Figure 1 As shown, a modular lithium battery pack includes a battery cell group 110, a battery management system 120, a connector 130, a status display module 140 and a housing 150.

[0024] The battery pack 110 includes 16 cylindrical battery cells, which are connected in series. The positive and negative electrodes of the battery pack 110 are connected to the battery management system 120 through wires. The plug-in 130 is connected to the battery management system 120 through wires. The status display module 140 is connected to the battery management system 120 through wires. All of the above components are fixed on the housing 150.

[0025] like Figure 2 As shown, the connector 130 has a power pin, a communication pin, a scene pin and a position pin, and the charging and discharging pins of the power pin are separated and independent. The number of power pins is 3 pins, the number of communication pins is 3 pins, the number of scene pins is 1 pin, and the number of position pins is 4 pins. The power pin is connected to the charge and discharge management module 127 of the battery management system 120 through wires. The communication pin, the scene pin and the position pin are connected to the communication module 124 of the battery management system 120 through wires.

[0026] like Figure 3As shown, the battery management system 120 includes a cell balancing management module 121, a cell sampling & monitoring module 122, a thermal balance management module 123, a communication module 124, a data storage module 125, an alarm module 126, a charge and discharge management module 127, and a logic control unit 128. The cell sampling & monitoring module 122 samples the voltage of a single cell through 16 single cell voltage sampling lines, and samples the current through the positive and negative poles of the cell group 110, and monitors the state of the cell in real time. The cell balancing management module 121 performs balancing management between cells through 16 single cell voltage sampling lines and parallel resistors. The thermal balance management module 123 is provided with 4 NTC temperature detection resistors, which respectively detect the temperature of the cell and the charge and discharge MOS tube, and monitor the temperature of the battery pack and the circuit board in real time. The communication module 124 communicates and transmits data and instructions with the external devices of the board through CAN / RS485 / I / O and other methods. The data storage module 125 is responsible for storing battery dynamics, alarms and other information. The alarm module 126 includes a buzzer and an LED light, which displays some alarm information of the battery to the user through sound and light. The charge and discharge management module 127 controls the charge and discharge circuit of the battery. The logic control unit 128 is the brain of the battery, which aggregates the information of each module, performs logical judgment according to the set rules, and controls the action of the components according to the judgment results.

[0027] In a specific implementation, when the battery pack 100 is inserted into the device, the connector 130 of the battery pack 100 is combined with the connector of the device. The battery pack 100 detects whether the battery pack is in a single-battery scene or a multi-battery scene through the level signal of the scene identification pin on the battery connector 130. If the scene identification pin is grounded, it is a multi-battery scene, otherwise it is a multi-battery scene. The physical position of the battery pack in the device is detected by the level signal combination of the address identification pin on the battery connector 130. If it is a single-battery scene, the position detection is always 1#, and the multi-battery scene can detect positions 1# to 6#.

[0028] like Figure 4As shown, the discharge port 102 and the charging port 103 of the charge and discharge management module 127 are separated independently, the discharge port 102 is controlled by multiple groups of top MOS 104 and MOS 105, and the charging port 103 is controlled by multiple groups of top MOS 106 and MOS 107. Such a circuit design can realize the bidirectional cutoff and unidirectional passing functions of each circuit. At the same time, the charging circuit integrates a 20A charging current limiting module 108. If it is a single battery scenario, the battery pack detects the current changes of the charging and discharging circuits through the load & charging detection 109 to identify whether the external device is a load or a charger. According to the identification result, if it is a load, the discharge MOS 104 is turned on, and if it is a charger, the charging MOS 107 is turned on. If it is a multi-battery scenario, the load & charging detection 109 function is disabled, and the battery pack charge and discharge management module 127 cannot make charging and discharging decisions by itself, and can only start the charging or discharging action through the instructions of the external upper-level control system received by the communication module 124. Since the discharge ports of the batteries in the multi-battery scenario are connected in parallel, and the charging ports of the batteries are also connected in parallel, the design of this circuit can prevent current backflow between battery packs with different voltages.

[0029] When the battery pack is inserted into the device, the communication pin of the connector 130 is connected to the communication pin of the device connector. The battery pack communicates with the external device through the communication module 124 and then through the communication circuit via CAN / RS485 to transmit data and instructions. It supports the control function of the host computer software or the device master BMS, and various parameters of the battery pack can be easily set through the host computer software or the master BMS. And the battery pack software can be upgraded.

[0030] like Figure 5 As shown, the battery pack status display module 140 is composed of 10 LED lamp beads, which will display the battery pack power and charging and discharging status according to the logic shown in the table. At the same time, the battery pack also has a built-in buzzer, which, under the control of the alarm module 126, gives a sound prompt to the user.

[0031] The advantages of this solution after being applied to the product include:

[0032] 1. Design a modular battery and develop various electric devices through standard definitions to make the battery universal and reduce repeated purchases of batteries.

[0033] 2. When purchasing equipment using this modular battery, you can only purchase the equipment itself, which greatly reduces the price of the equipment;

[0034] 3. Greatly reduce the number of batteries purchased and reduce the difficulty of handling scrapped batteries.

[0035] 4. This solution has a complete battery management system to improve battery efficiency, extend battery life, and improve battery safety.

[0036] 5. This solution has the function of communicating with the device, which can provide power to the device and charge the battery more accurately.

[0037] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A modular lithium battery pack, characterized in that: It includes a battery pack, a battery management system, a battery connector, a status display module and a shell; the battery pack, the battery connector and the status display module are all electrically connected to the battery management system; The battery cell group comprises a plurality of battery cells connected in series; The battery management system at least includes a charge and discharge management module and a communication module; the charge and discharge management module is used to control the charge and discharge circuit of the battery; the communication module is used to communicate with external devices to transfer data and instructions; The connector includes a power port, a communication port, a scene recognition port and a position recognition port; the power port is used for charging / discharging circuit connection; the communication port is used for communicating with external devices; The scene identification port is used to identify single-battery and multi-battery application scenarios; the position identification port is used to identify the physical position of the battery on the external device.

2. The modular lithium battery pack according to claim 1, characterized in that: The power port includes a charging port and a discharging port which are independently arranged.

3. The modular lithium battery pack according to claim 1, characterized in that: The battery management system also includes a cell balancing management module, a cell sampling & monitoring module, a thermal balance management module, a data storage module, an alarm module, and a logic control unit; the cell balancing management module is used to perform balancing management between cells; the cell sampling & monitoring module is used to monitor the cell status; the thermal balance management module is used to monitor the temperature of the battery pack and the circuit board in real time; the data storage module is used to store battery dynamic information; the alarm module is used to display the battery alarm information to the user through sound and light; The logic control unit is used to aggregate the information of each module, perform logic judgment according to the set rules, and control the action of the components according to the judgment results.

4. The modular lithium battery pack according to claim 3, characterized in that: The thermal balance management module detects the temperature of the battery cell through an NTC resistor.

5. The modular lithium battery pack according to claim 3, characterized in that: The cell balancing management module performs balancing management between cells by connecting resistors in parallel to the cell voltage sampling lines.

6. The modular lithium battery pack according to claim 3, characterized in that: The cell sampling & monitoring module samples the voltage of a single cell through a single cell voltage sampling line, samples the current through the positive and negative electrodes of the cell group, and monitors the status of the cell in real time.

7. The modular lithium battery pack according to claim 3, characterized in that: The alarm module displays the alarm information by controlling the buzzer and LED light.

8. The modular lithium battery pack according to claim 1, characterized in that: The communication module communicates with external devices via RS485 communication and CAN bus.

9. The modular lithium battery pack according to claim 1, characterized in that: The status display module includes a plurality of colored LED lamp beads. Under the control of the battery management system, the colored LED lamp beads indicate the battery power level through different brightness and indicate the battery working status through different colors.

10. The modular lithium battery pack according to claim 2, characterized in that: The charging / discharging circuits are separated, both of which are bidirectional on-off controlled and have load and charging detection modules, and the charging circuit is provided with charging current limiting.

Images