Multi-battery pack parallel system capable of changing battery

Abstract

The utility model relates to a battery-replaceable multi-battery pack parallel system, which comprises a battery pack system, and the battery pack system at least comprises two groups of battery pack modules. The battery pack modules are connected in parallel; the battery pack module comprises an energy storage battery pack, a contactor, an anti-reverse diode, an output port, an output detection point, a change-over switch and a battery management controller BMS; one end of the energy storage battery pack is connected with the contactor and the anti-reverse diode through a circuit, and the other end is connected with the output port; the anti-reverse diode is connected in parallel with the contactor; the other end of the contactor is connected with the output port; the battery management controller BMS is connected with the change-over switch and executes battery pack discharge switching; and the battery management controller BMS is connected with the output port through the output detection point. According to the utility model, the flexible control of independent discharge or parallel simultaneous discharge of each battery pack is realized, and the technical effects of safely switching the discharge mode of the battery pack and conveniently replacing the battery pack during independent power supply are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy battery pack battery replacement technical field, specifically a kind of replaceable multi-cell pack parallel system. BACKGROUND

[0002] With the vigorous development of new energy vehicle market, the charging problem of vehicle increasingly becomes the key factor restricting its further popularization. The traditional fixed charging facility is difficult to meet the convenience demand of user in distribution density and charging speed, especially in some special scene or emergency, quickly, conveniently for new energy vehicle to supplement electric energy becomes the core problem to be solved urgently, which promotes the research and innovation of mobile charging technology, and then promotes the utility model process of the replaceable multi-cell pack parallel system.

[0003] The traditional mobile charging solution mainly adopts single battery pack combined with charging system to form integrated mobile charging equipment. Its advantage lies in relatively simple structure, which can provide mobile charging function to a certain extent. However, this scheme has many significant shortcomings. Single capacity is large, which not only occupies a large amount of transportation space, increases transportation difficulty and cost, but also has poor flexibility in actual use scene, and is difficult to adapt to diversified charging demand.

[0004] Most of the existing technologies on the market still improve the traditional integrated mobile charging equipment architecture described above, although there is certain improvement in charging efficiency, but it does not fundamentally solve the problems of large volume, inconvenient transportation and high cost. Part of the existing technology may try to optimize battery performance, but the innovation of overall system architecture is insufficient, and it cannot meet the growing market demand for efficient, convenient and low-cost mobile charging equipment. UTILITY MODEL CONTENT

[0005] The replaceable multi-cell pack parallel system of the application reduces the dependence on single battery pack capacity by adopting the architecture of at least 2 groups of battery pack systems in parallel, thereby reducing the overall volume of the equipment, improving transportation convenience and reducing cost.

[0006] The replaceable multi-cell pack parallel system of the utility model, including battery pack system, the battery pack system at least includes 2 groups of battery pack module;The battery pack module is connected through parallel connection between the battery pack module;

[0007] The battery pack module includes energy storage battery group 1, contactor, anti-reverse diode, output port, output detection point, switching switch and battery management controller BMS;

[0008] One end of the energy storage battery group 1 is connected with the contactor and the anti-reverse diode through a circuit, and the other end is connected with the output port;The anti-reverse diode is connected in parallel with the contactor;The other end of the contactor is connected with the output port;

[0009] The battery management controller BMS is connected with the switch and performs battery pack discharge switching; the battery management controller BMS is connected with the output detection point and the output port.

[0010] Preferably, the contactor of the battery pack module includes a No. 1 contactor and a No. 2 contactor, and the No. 1 contactor and the No. 2 contactor are connected in series.

[0011] Preferably, the anti-reverse diode in the battery pack module can be freely switched to the parallel position of the No. 1 contactor and the No. 2 contactor; when the anti-reverse diode is switched to the No. 1 contactor, the anode of the anti-reverse diode is connected to one end of the No. 1 contactor, and the cathode of the anti-reverse diode is connected to the output end of the energy storage battery pack 1; when the anti-reverse diode is switched to the No. 2 contactor, the anode of the anti-reverse diode is connected to one end of the No. 2 contactor, and the cathode is connected to the output end.

[0012] Preferably, the output port of the battery pack module includes a port P+ and a port P-, and the output port is connected with the charging pile through the port P+ and the port P-; the output ports of the battery pack modules are connected in parallel.

[0013] Preferably, the battery management controller BMS of the battery pack module communicates with the BMS of other battery pack modules through the CAN bus; the battery management controller BMS controls the independent discharge or parallel discharge of the battery pack module, and in the battery pack switching discharge process of the battery pack module, whether to perform switching operation is determined according to the communication state of the battery management controller BMS of other battery pack modules and the fault information of the battery pack; the battery management controller BMS is connected with the No. 1 contactor and the No. 2 contactor, and controls the opening and closing state of the No. 1 contactor and the No. 2 contactor; the No. 1 contactor is closed and the No. 2 contactor is opened during discharging; the No. 1 contactor is closed and the No. 2 contactor is closed during charging.

[0014] A replaceable multi-battery pack parallel system includes a battery pack system, the battery pack system includes a busbar box and at least two groups of battery pack modules;

[0015] The busbar box includes a pre-charge resistor, a contactor, an anti-reverse diode, and a battery management main controller BMS;

[0016] The battery pack module includes an energy storage battery pack 1, a battery management slave controller BMS, a main positive contactor, a main negative contactor, and a port;

[0017] The anti-reverse diode in the busbar box is connected in parallel with the pre-charge resistor and the contactor, the busbar box contactor is connected with the port of the battery pack module, and the port is connected with the main positive contactor of the battery pack module;

[0018] The battery management master controller BMS in the bus box sets a battery pack control switch; the battery management master controller BMS is in communication connection with a battery management slave controller BMS through CAN;

[0019] The battery pack module energy storage battery group 1 is connected with a main positive contactor at one end and a main negative contactor at the other end; the main negative contactor is connected with the bus box through a port.

[0020] Preferably, the bus box contactors include a No. 1 contactor and a No. 2 contactor; the No. 1 contactor and the No. 2 contactor are connected in series.

[0021] Preferably, the anti-reverse diode in the bus box can be freely switched to a parallel position of the No. 1 contactor and the No. 2 contactor; when the anti-reverse diode is switched to the No. 1 contactor, the anode of the anti-reverse diode is connected with one end of the No. 2 contactor, and the cathode of the anti-reverse diode is connected to the port of the battery pack module; when the anti-reverse diode is switched to the No. 2 contactor, the cathode of the anti-reverse diode is connected with one end of the No. 1 contactor, and the anode of the anti-reverse diode is connected to the port.

[0022] Preferably, the port of the battery pack module includes a discharge port P+ / P-, and the charging port includes C+ / C-; the battery pack module is connected with the bus box contactor through the discharge port; the battery pack module is connected with the charging pile through the charging port.

[0023] Preferably, the battery management master controller BMS in the bus box is connected with the battery management slave controller BMS through a CAN communication line; the battery management master controller BMS controls the discharge start, stop and discharge current size operation instructions of each battery pack module by sending instructions to the battery management slave controller BMS, and receives the battery pack state information of the battery management slave controller BMS, including the battery capacity, temperature and voltage parameters.

[0024] Compared with the prior art, the technical scheme of the application has the following technical effects:

[0025] The anti-reverse flow circuit formed by the at least two groups of battery pack systems in parallel solves the problems of large single capacity, large size, inconvenient transportation and high cost of the traditional mobile charging equipment, and achieves the technical effects of reducing the size of the equipment, improving the transportation convenience and reducing the cost, and effectively avoids the formation of circulating current in each battery pack during the switching discharge of multiple battery packs, thereby protecting the battery pack equipment.

[0026] The utility model discloses a CAN communication technology between each battery pack battery management controller BMS, solves the problem that each battery pack discharging work is difficult to control, realizes the flexible control of each battery pack independent discharge or parallel discharge, gets the technical effect that can switch the battery pack discharge mode according to actual demand safely, and when independent power supply, can conveniently replace the battery pack, improves the practicality and operability of system.

[0027] The utility model discloses the scheme that the total battery management controller BMS is added in the battery pack bus box and communicates with the BMS controller of each battery pack, solves the problem that the whole control each battery pack discharging work lacks unified efficient management, realizes the centralized management and accurate coordination to each battery pack discharging work, gets the technical effect that system discharging process is more stable, balanced, prolongs the service life of battery, enhances the reliability and stability of system.

[0028] The above description is only the summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, so as to be implemented according to the content of the specification, and in order to let the above and other purposes, features and advantages of the application can be more obvious and easy to understand, the following preferred embodiments of the application and cooperate with the drawings are described in detail as follows.

[0029] According to the detailed description of the specific embodiments of the application in the following combined with the drawings, those skilled in the art will be more clear the above and other purposes, advantages and characteristics of the application. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical scheme in the embodiments of the application or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can obtain other drawings according to these drawings without creating labor.In all drawings, similar elements or parts are generally identified by similar reference signs.The elements or parts in the drawings are not necessarily drawn according to the actual proportion.

[0031] Figure 1 The utility model discloses a replaceable multi-battery pack parallel system schematic diagram;

[0032] Figure 2 The utility model discloses a replaceable multi-battery pack parallel system master-slave control schematic diagram.

[0033] Sign 1, energy storage battery group. DETAILED DESCRIPTION

[0034] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. In the following description, specific details such as specific configurations and components are provided only to help a comprehensive understanding of the embodiments of the present application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, in order to be clear and concise, the description of known functions and structures is omitted in the embodiments.

[0035] It should be understood that the "one embodiment" or "the embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "one embodiment" or "the embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0036] In addition, reference numerals and / or letters can be repeated in different examples in the present application. Such repetition is for the purpose of simplification and clarity, and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0037] The term "and / or" herein is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, B exists alone, and A and B exist together. The term "and" herein is a description of another association relationship of the associated objects, which means that there can be two relationships, for example, A and B can mean that A exists alone and A and B exist together. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0038] The term "at least one" herein is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, at least one of A and B can mean that A exists alone, A and B exist together, and B exists alone.

[0039] It should also be noted that the relationship terms such as first and second in the present document are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion. Embodiment one:

[0040] The embodiment mainly describes a basic structure of a replaceable battery multi-battery pack parallel system, as shown in the figure, including a battery pack system, the battery pack system, a battery pack module; the battery pack module includes a group A battery pack module and a group B battery pack module; the group A battery pack module and the group B battery pack module are connected in parallel between them; Figure 1

[0041] Any one battery pack module includes a storage battery pack 1, a contactor, a reverse prevention diode, an output port, an output detection point, a switching switch and a battery management controller BMS;

[0042] One end of the storage battery pack 1 is connected with the contactor and the reverse prevention diode through a circuit, and the other end is connected with the output port; the reverse prevention diode is connected in parallel with the contactor; the other end of the contactor is connected with the output port;

[0043] The battery management controller BMS is connected with the switching switch to perform battery pack discharge switching; the battery management controller BMS is connected with the output port through the output detection point.

[0044] Further, the contactors of the group A battery pack module and the group B battery pack module respectively include a No. 1 contactor and a No. 2 contactor, and the No. 1 contactor and the No. 2 contactor are connected in series.

[0045] Further, the reverse prevention diodes in the group A battery pack module and the group B battery pack module are connected in parallel with the respective No. 1 contactor; the anode of the reverse prevention diode is connected with one end of the No. 1 contactor, and the cathode of the reverse prevention diode is connected to the output end of the storage battery pack 1;

[0046] Further, the output ports of the group A battery pack module and the group B battery pack module include a port P+ and a port P-, and the output port is connected with the charging pile through the port P+ and the port P-; the output ports of the group A battery pack module and the group B battery pack module are connected in parallel.

[0047] Further, the battery management controllers BMS of the group A battery pack module and the group B battery pack module communicate with each other through a CAN bus, wherein the CAN bus between the group A battery pack module and the group B battery pack module includes a CAN1 communication line and a CAN2 communication line;

[0048] Further, the battery management controllers BMS of the group A battery pack module and the group B battery pack module control independent discharge or parallel discharge of the respective battery pack modules, and in the battery pack switching discharge process of the battery pack module, whether to perform switching operation is judged through the communication state of the battery management controller BMS of the other battery pack module and the fault information of the battery pack;

[0049] For switching operation, it includes manual switching and automatic switching;

[0050] ​When the automatic switching is performed, the power of the battery pack module in group A is about to be depleted, and the two conditions that the communication between the battery pack module in group A and the battery pack module in group B is normal and the battery pack module in group B has no discharge fault are met, the discharge task is automatically switched from the battery pack module in group A to the battery pack module in group B, seamless transition is realized, and the continuity of power supply is ensured; if the communication between the battery pack module in group A and the battery pack module in group B is abnormal or the battery pack module in group B has a fault and cannot discharge, the battery pack module in group A continues to discharge, and switching failure is triggered and reported, and a fault light is turned on to prompt the user.

[0051] In the manual switching aspect, if the battery pack module in group A is discharging, after the user manually presses the switching switch of the battery pack module in group A, it is detected whether the communication between the battery pack module in group A and the battery pack module in group B is normal and whether the battery pack module in group B has a discharge fault, and only when the two conditions are met, the discharge switching from the battery pack module in group A to the battery pack module in group B is performed; if the communication between the battery pack module in group A and the battery pack module in group B is abnormal or the battery pack module in group B has a fault and cannot discharge, or the switching switch of the battery pack module in group B is pressed by mistake, the battery pack module in group A will maintain the discharging state, switching failure is reported, and a fault light is turned on.

[0052] In the charging and discharging process, the battery management controller BMS is connected with the first contactor and the second contactor, and controls the opening and closing states of the first contactor and the second contactor; when discharging, the first contactor is controlled to be closed and the second contactor is controlled to be opened; when charging, the first contactor is controlled to be closed and the second contactor is controlled to be closed.

[0053] The parallel connection of the two-group battery pack system in the embodiment solves the problems of large single capacity, large size, inconvenient transportation and high cost of the traditional mobile charging device through the anti-backflow circuit formed, and technical effects of reduced device size, improved transportation convenience and reduced cost are obtained, and the formation of circulating current in each battery pack during the switching discharge of the multiple battery packs is effectively avoided, and the battery pack device is protected. Embodiment Two

[0054] The embodiment describes in detail the optimization structure of the replaceable multi-battery pack parallel system based on Embodiment 1, which mainly describes an optimization structure of a replaceable multi-battery pack parallel system, as shown in Figure 2 The replaceable multi-battery pack parallel system includes a battery pack system, and the battery pack system includes a busbar box and two groups of battery pack modules;

[0055] The busbar box includes a pre-charging resistor, a contactor, an anti-backflow diode and a battery management main controller BMS;

[0056] The battery pack modules include a battery pack module in group A and a battery pack module in group B; any battery pack module includes an energy storage battery pack 1, a battery management slave controller BMS, a main positive contactor, a main negative contactor and a port;

[0057] The anti-reverse diode in the bus box is connected in parallel with the pre-charge resistor and the contactor, the bus box contactor is connected with the ports of the A group battery pack module and the B group battery pack module, and the ports are connected with the main positive contactors of the A group battery pack module and the B group battery pack module;

[0058] The battery management main controller BMS in the bus box sets the battery pack control switch, including the A group battery pack switch and the B group battery pack switch; the battery management main controller BMS in the bus box is connected in communication with the battery management slave controller BMS through CAN;

[0059] The energy storage battery group 1 in the battery pack module is connected with the main positive contactor at one end and the main negative contactor at the other end; the main negative contactor is connected with the bus box through the port.

[0060] Further, the bus box contactor includes a No. 1 contactor and a No. 2 contactor; the No. 1 contactor and the No. 2 contactor are connected in series.

[0061] Further, the anti-reverse diode in the bus box is connected in parallel with the No. 2 contactor;

[0062] Further, the ports of the A group battery pack module and the B group battery pack module each include a discharge port P+ / P- and a charging port including C+ / C-; the battery pack module is connected with the bus box contactor through the discharge port; the battery pack module is connected with the charging pile through the charging port.

[0063] Further, the battery management main controller BMS in the bus box is connected with the battery management slave controller BMS through the CAN communication line; the battery management main controller BMS controls the discharge start, stop, and discharge current size operation instructions of each battery pack module by sending instructions to the battery management slave controller BMS, and simultaneously receives the battery pack state information of the battery management slave controller BMS, including the battery capacity, temperature, and voltage parameters.

[0064] This embodiment describes in detail that a total battery management controller BMS is added in the battery pack bus box and communicates with the BMS controllers of each battery pack, which brings significant technical effects. Through the centralized management and coordination of the total BMS, the discharge work of each battery pack can be more accurately controlled as a whole, effectively avoiding the discharge imbalance problem that may occur due to individual control of each battery pack, ensuring the stability and reliability of the entire system during the discharge process. When multiple battery packs are connected in parallel for discharge, the discharge tasks can be dynamically allocated according to the real-time state information of each battery pack, such as capacity, temperature, etc., prolonging the overall service life of the battery pack and improving the energy utilization efficiency of the system. At the same time, the system's ability to cope with complex working conditions and faults is also enhanced. Once an abnormality occurs in a certain battery pack, the total BMS can quickly respond and adjust the discharge strategy, ensuring the continuous and safe operation of the entire replaceable multi-battery pack parallel system.

[0065] The above are only preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. For those skilled in the art, the present application can have various changes and modifications; any change, modification, replacement, integration and parameter change of the embodiments within the spirit and principle of the present application, which can realize the same function without departing from the principle and spirit of the present application, fall within the protection scope of the present application.

Claims

1. A replaceable battery multi-battery pack and connection system, characterized by, The battery pack system comprises at least two groups of battery pack modules, and the battery pack modules are connected in parallel; The battery pack module comprises an energy storage battery pack (1), a contactor, a reverse prevention diode, an output port, an output detection point, a switching switch and a battery management controller BMS; One end of the energy storage battery pack (1) is connected with the contactor and the reverse prevention diode through a circuit, and the other end is connected with the output port; the reverse prevention diode is connected in parallel with the contactor; the other end of the contactor is connected with the output port; The battery management controller BMS is connected with the switching switch to perform battery pack discharge switching; the battery management controller BMS is connected with the output port through the output detection point. 2.The replaceable battery multi-battery pack and connection system of claim 1, wherein, The contactor of the battery pack module comprises a No. 1 contactor and a No. 2 contactor, and the No. 1 contactor and the No. 2 contactor are connected in series. 3.The replaceable battery multi-battery pack and connection system of claim 1, wherein, The reverse prevention diode in the battery pack module can be freely switched in the parallel position of the No. 1 contactor and the No. 2 contactor; when the reverse prevention diode is switched in the No. 1 contactor, the anode of the reverse prevention diode is connected with one end of the No. 1 contactor, and the cathode of the reverse prevention diode is connected to the output end of the energy storage battery pack (1); when the reverse prevention diode is switched in the No. 2 contactor, the anode of the reverse prevention diode is connected with one end of the No. 2 contactor, and the cathode is connected to the output end. 4.The replaceable battery multi-battery pack and connection system of claim 1, wherein, The output port of the battery pack module comprises a port P+ and a port P-, and the output port is connected with the charging pile through the port P+ and the port P-; the output port of the battery pack module is connected in parallel. 5.The replaceable battery multi-battery pack and connection system of claim 1, wherein, The battery management controller BMS of the battery pack module communicates with the BMS of other battery pack modules through a CAN bus; the battery management controller BMS controls the independent discharge or parallel discharge of the battery pack module, and in the battery pack switching discharge process of the battery pack module, whether to perform switching operation is determined according to the communication state of the battery management controller BMS of other battery pack modules and the fault information of the battery pack; the battery management controller BMS is connected with the No. 1 contactor and the No. 2 contactor to control the opening and closing state of the No. 1 contactor and the No. 2 contactor; When discharging, control the No. 1 contactor to be closed and the No. 2 contactor to be disconnected; When charging, control the No. 1 contactor to be closed and the No. 2 contactor to be closed.

6. The replaceable battery multi-battery pack and connection system of any one of claims 1-4, wherein, The battery pack system comprises a busbar box and at least two groups of battery pack modules; The busbar box comprises a pre-charging resistor, a contactor, a reverse prevention diode and a battery management main controller BMS; The battery pack module comprises an energy storage battery pack (1), a battery management slave controller BMS, a main positive contactor, a main negative contactor and a port; The reverse prevention diode in the busbar box is connected in parallel with the pre-charging resistor and the contactor, the busbar box contactor is connected with the port of the battery pack module, and the busbar box contactor is connected with the main positive contactor of the battery pack module through the port; The battery management main controller BMS in the busbar box sets a battery pack control switch; the battery management main controller BMS is connected with the battery management slave controller BMS through a CAN bus; One end of the energy storage battery pack (1) of the battery pack module is connected with the main positive contactor, and the other end is connected with the main negative contactor; the main negative contactor is connected with the busbar box through the port. 7.The replaceable battery multi-battery pack and connection system of claim 6, wherein, The bus box contactor comprises a No.1 contactor and a No.2 contactor; the No.1 contactor and the No.2 contactor are connected in series. 8.The replaceable battery multi-battery pack and connection system of claim 6, wherein, The anti-reverse diode in the bus box can be switched freely in the parallel position of the No.1 contactor and the No.2 contactor; when the anti-reverse diode is switched in the No.1 contactor, the anode of the anti-reverse diode is connected to one end of the No.2 contactor, and the cathode of the anti-reverse diode is connected to the port of the battery pack module; when the anti-reverse diode is switched in the No.2 contactor, the cathode of the anti-reverse diode is connected to one end of the No.1 contactor, and the anode of the anti-reverse diode is connected to the port. 9.The replaceable battery multi-battery pack and connection system of claim 6, wherein, The port of the battery pack module comprises a discharge port P+ / P-, and the charging port comprises C+ / C-; the battery pack module is connected to the bus box contactor through the discharge port; the battery pack module is connected to the charging pile through the charging port. 10.The replaceable battery multi-battery pack and connection system of claim 9, wherein, The battery management master controller BMS in the bus box is connected to the battery management slave controller BMS through a CAN communication line; the battery management master controller BMS controls the discharge start, stop and discharge current size operation instructions of each battery pack module by sending instructions to the battery management slave controller BMS, and simultaneously receives the battery pack state information of the battery management slave controller BMS, including the battery capacity, temperature and voltage parameters.

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