Multi-battery pack parallel system capable of changing battery

Abstract

The invention 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 invention, 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 present invention relates to the field of new energy battery pack replacement technology, and in particular to a parallel system of multiple replaceable battery packs. Background Art

[0002] With the booming development of the new energy vehicle market, the issue of vehicle charging has increasingly become a key factor restricting its further popularization. Traditional fixed charging facilities are difficult to meet users' convenience needs in terms of distribution density and charging speed. Especially in some special scenarios or emergency situations, quickly and conveniently replenishing power for new energy vehicles has become a core issue that needs to be solved urgently. This has prompted the research and development and innovation of mobile charging technology, and further promoted the invention of this replaceable multi-battery pack parallel system.

[0003] Traditional mobile charging solutions mainly use a single battery pack combined with a charging system to form an integrated mobile charging device. Its advantage is that the structure is relatively simple and can provide mobile charging functions to a certain extent. However, this solution has many significant disadvantages. The large single capacity leads to a large device size, which not only takes up a lot of transportation space, increases the difficulty and cost of transportation, but also has poor flexibility in actual use scenarios and is difficult to adapt to diverse charging needs.

[0004] Most of the existing technologies on the market are still improving on the above-mentioned traditional integrated mobile charging device architecture. Although there are certain improvements in charging efficiency, they have not fundamentally solved the problems of large size, inconvenient transportation and high cost. Some existing technologies may try to optimize battery performance, but the overall system architecture is not innovative enough to meet the growing market demand for efficient, convenient and low-cost mobile charging devices.

[0005] The replaceable multi-battery pack parallel system of the present application effectively reduces the dependence on the capacity of single battery cells by adopting an architecture of at least 2 battery pack systems in parallel, thereby reducing the overall size of the equipment, improving transportation convenience and reducing costs. Summary of the invention

[0006] The present invention provides a battery-exchangeable multi-battery parallel system, comprising a battery pack system, wherein the battery pack system comprises at least two groups of battery pack modules; the battery pack modules are connected in parallel; The battery pack module includes an energy storage battery group 1, a contactor, an anti-reverse 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 to a contactor and an anti-reverse diode through a circuit, and the other end is connected to an output port; the anti-reverse diode is connected in parallel with the contactor; the other end of the contactor is connected to the output port; The battery management controller BMS is connected to the switching switch to execute the discharge switching of the battery pack; the battery management controller BMS is connected to the output port through the output detection point.

[0007] Preferably, the contactor of the battery pack module includes contactor No. 1 and contactor No. 2, and contactor No. 1 and contactor No. 2 are connected in series.

[0008] Preferably, the anti-reverse diode in the battery pack module can be freely switched between the parallel positions of contactor No. 1 and contactor No. 2; when the anti-reverse diode is switched to contactor No. 1, the anode of the anti-reverse diode is connected to one end of contactor No. 1, and the cathode of the anti-reverse diode is connected to the output end of the energy storage battery group 1; when the anti-reverse diode is switched to contactor No. 2, the anode of the anti-reverse diode is connected to one end of contactor No. 2, and the cathode is connected to the output end.

[0009] Preferably, the output port of the battery pack module includes a port P+ and a port P-, and the output port is connected to the charging pile through the port P+ and the port P-; the output port of the battery pack module is connected in parallel.

[0010] Preferably, the battery management controller BMS of the battery pack module communicates with the BMS of other battery packs through the CAN bus; the battery management controller BMS controls the battery pack modules to discharge independently or in parallel simultaneously, and during the battery pack switching discharge process of the battery pack module, it is determined whether to perform the switching operation through the communication status 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 to contactor No. 1 and contactor No. 2 to control the opening and closing status of contactor No. 1 and contactor No. 2; during the discharge, contactor No. 1 is controlled to be closed and contactor No. 2 is disconnected; during the charging, contactor No. 1 is controlled to be closed and contactor No. 2 is controlled to be closed.

[0011] A battery-swappable multi-battery parallel system, based on any one of claims 1 to 4, comprising a battery pack system, wherein the battery pack system comprises a combiner box and at least two groups of battery pack modules; The combiner box includes a pre-charging resistor, a contactor, an anti-reverse diode and a battery management main controller BMS; 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; The anti-reverse diode in the combiner box is connected in parallel with the pre-charging resistor and the contactor, and the combiner box contactor is connected to the port of the battery pack module, and is connected to the main positive contactor of the battery pack module through the port; The battery management master controller BMS in the combiner box is provided with a battery pack control switch; the battery management master controller BMS is connected to the battery management slave controller BMS via CAN; One end of the battery pack module energy storage battery group 1 is connected to the main positive contactor, and the other end is connected to the main negative contactor; the main negative contactor is connected to the junction box through a port.

[0012] Preferably, the combiner box contactor includes contactor No. 1 and contactor No. 2; contactor No. 1 and contactor No. 2 are connected in series.

[0013] Preferably, the anti-reverse diode in the junction box can be freely switched between the parallel positions of contactor No. 1 and contactor No. 2; the anti-reverse diode is switched to contactor No. 1, the anode of the anti-reverse diode is connected to one end of contactor No. 2, and the cathode of the anti-reverse diode is connected to the port of the battery pack module; the anti-reverse diode is switched to contactor No. 2, the cathode of the anti-reverse diode is connected to one end of contactor No. 1, and the anode of the anti-reverse diode is connected to the port.

[0014] Preferably, the ports of the battery pack module include a discharge port P+ / P-, and a charging port includes C+ / C-; the battery pack module is connected to the junction box contactor through the discharge port; and the battery pack module is connected to the charging pile through the charging port.

[0015] Preferably, the battery management main controller BMS in the combiner box is connected to the battery management slave controller BMS through a 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 at the same time receives the battery pack status information from the battery management slave controller BMS, including battery power, temperature, and voltage parameters.

[0016] Compared with the prior art, the technical solution of this application has the following technical effects: The present invention solves the problems of large single-cell capacity, large volume, inconvenient transportation and high cost of traditional mobile charging equipment by connecting at least two battery pack systems in parallel and providing an anti-backflow circuit composed of a diode and a discharge relay in each battery pack system, thereby achieving the technical effect of reducing the volume of the equipment, improving the convenience of transportation and reducing the cost. At the same time, it effectively avoids the formation of circulation in each battery pack when multiple battery packs switch to discharge, thereby protecting the battery pack equipment.

[0017] The present invention utilizes the CAN communication technology between the battery management controllers BMS of each group of battery packs to solve the problem that the discharge work of each battery pack is difficult to coordinate and control, and realizes flexible control of independent discharge or simultaneous discharge of each battery pack in parallel, thereby achieving the technical effect of being able to safely switch the battery pack discharge mode according to actual needs and conveniently replace the battery pack when independently powered, thereby improving the practicality and operability of the system.

[0018] The present invention solves the problem of lack of unified and efficient management of the overall control of the discharge of each battery pack by adding a total battery management controller BMS in the battery pack junction box and communicating with the BMS controller of each battery pack, thereby realizing centralized management and precise coordination of the discharge of each battery pack, achieving the technical effect of making the system discharge process more stable and balanced, extending the battery service life, and enhancing the reliability and stability of the system.

[0019] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application so that it can be implemented in accordance with the contents of the specification, and to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following is a detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings as follows.

[0020] Based on the detailed description of the specific embodiments of the present application in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other objects, advantages and features of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0022] Figure 1 , a schematic diagram of a parallel system of multiple replaceable battery packs of the present invention; Figure 2 , schematic diagram of master-slave control of the parallel system of multiple replaceable battery packs of the present invention.

[0023] Figure numerals: 1. Energy storage battery pack. DETAILED DESCRIPTION

[0024] To make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all of the embodiments. In the following description, specific details such as specific configuration and components are provided only to help fully understand the embodiments of the present application. Therefore, it should be clear to those skilled in the art 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, for clarity and brevity, the description of known functions and structures is omitted in the embodiment.

[0025] It should be understood that the references to "one embodiment" or "this embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "one embodiment" or "this embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0026] In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0027] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another type of association object relationship, indicating that there can be two relationships. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0028] The term "at least one" in this article is merely a description of the association relationship of associated objects, indicating that there may be three relationships. For example, at least one of A and B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0029] It should also be noted that, in this article, relational terms such as first and second, etc. 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 these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusions. Example 1

[0030] This embodiment mainly describes the basic structure of a replaceable multi-battery pack parallel system, such as Figure 1 As shown, it includes a battery pack system, a battery pack system, and 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; Any battery pack module includes an energy storage battery group 1, a contactor, an anti-reverse 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 to the contactor and the anti-reverse diode through the circuit, and the other end is connected to the output port; the anti-reverse diode is connected in parallel with the contactor; the other end of the contactor is connected to the output port; The battery management controller BMS is connected to the switching switch to execute the discharge switching of the battery pack; the battery management controller BMS is connected to the output port through the output detection point.

[0031] Furthermore, the contactors of the battery pack modules of group A and the battery pack modules of group B include contactor No. 1 and contactor No. 2, respectively, and contactor No. 1 and contactor No. 2 are connected in series.

[0032] Furthermore, the anti-reverse diodes in the battery pack modules of group A and group B are connected in parallel with their respective contactors No. 1; the anode of the anti-reverse diode is connected to one end of the contactor No. 1, and the cathode of the anti-reverse diode is connected to the output end of the energy storage battery group 1; Furthermore, the output ports of the battery pack modules of group A and group B include port P+ and port P-, and the output ports are connected to the charging pile through port P+ and port P-; the output ports of the battery pack modules of group A and group B are connected in parallel.

[0033] Further, the battery management controllers BMS of the battery pack module of group A and the battery pack module of group B communicate with each other via a CAN bus, wherein the CAN bus between the battery pack module of group A and the battery pack module of group B includes a CAN1 communication line and a CAN2 communication line; Furthermore, the battery management controller BMS of the battery pack module of group A and the battery pack module of group B controls the respective battery pack modules to discharge independently or discharge in parallel at the same time. During the battery pack switching discharge process of the battery pack module, it is determined whether to perform the switching operation through the communication status of the battery management controller BMS of other battery pack modules and the fault information of the battery pack; For switching operations, including manual switching and automatic switching; It switches automatically. When the power of Group A battery pack module is about to be exhausted and the two conditions are met, that is, the communication between Group A battery pack module and Group B battery pack module is normal and there is no discharge fault in Group B battery pack module, the discharge task will be automatically switched from Group A battery pack module to Group B battery pack module to achieve seamless transition and ensure the continuity of power supply. If the communication between Group A battery pack module and Group B battery pack module is abnormal or Group B battery pack module has a fault and cannot discharge, Group A battery pack module will continue to discharge and trigger the reporting of switching fault, and the fault light will light up to prompt the user.

[0034] In terms of manual switching, if the A battery pack module is discharging, the user manually presses the switching switch of the A battery pack module to detect whether the communication between the A battery pack module and the B battery pack module is normal and whether the B battery pack module has a discharge fault. Only when both conditions are met, the discharge switching from the A battery pack module to the B battery pack module is executed; if there is a problem with the communication between the A battery pack module and the B battery pack module, or the B battery pack module has a fault and cannot discharge, or the switching switch of the B battery pack module is pressed by mistake, the A battery pack module will maintain the discharge state, report the switching fault, and the fault light will light up.

[0035] During the charging and discharging process, the battery management controller BMS is connected to contactor No. 1 and contactor No. 2 to control the opening and closing status of contactor No. 1 and contactor No. 2; during discharging, contactor No. 1 is controlled to be closed and contactor No. 2 is disconnected; during charging, contactor No. 1 is controlled to be closed and contactor No. 2 is closed.

[0036] This embodiment connects two battery pack systems in parallel and sets an anti-backflow circuit composed of a diode and a discharge relay in each battery pack system, thereby solving the problems of large single-cell capacity, large volume, inconvenient transportation and high cost of traditional mobile charging equipment, and achieves the technical effect of reducing the size of the equipment, improving the convenience of transportation and reducing the cost. At the same time, it effectively avoids the formation of circulation in each battery pack when multiple battery packs switch to discharge, thereby protecting the battery pack equipment. Example 2

[0037] The detailed description of this embodiment is based on Embodiment 1, and mainly describes an optimized structure of a replaceable multi-battery pack parallel system, such as Figure 2 As shown, a battery-swappable multi-battery pack parallel system includes a battery pack system, and the battery pack system includes a combiner box and two groups of battery pack modules; The combiner box includes pre-charging resistor, contactor, anti-reverse diode and battery management main controller BMS; The battery pack module includes a group A battery pack module and a group B battery pack module; any battery pack module includes an energy storage battery group 1, a battery management slave controller BMS, a main positive contactor, a main negative contactor and a port; The anti-reverse diode in the combiner box is connected in parallel with the pre-charging resistor and the contactor. The combiner box contactor is connected to the ports of the battery pack module of group A and the battery pack module of group B, and is connected to the main positive contactor of the battery pack module of group A and the battery pack module of group B through the port; The battery management master controller BMS in the combiner box sets the battery pack control switch, including the A group battery pack switch and the B group battery pack switch; the battery management master controller BMS in the combiner box is connected to the battery management slave controller BMS through CAN communication; One end of the energy storage battery group 1 in the battery pack module is connected to the main positive contactor, and the other end is connected to the main negative contactor; the main negative contactor is connected to the junction box through a port.

[0038] Furthermore, the combiner box contactor includes a No. 1 contactor and a No. 2 contactor; and the No. 1 contactor and the No. 2 contactor are connected in series.

[0039] Furthermore, the anti-reverse diode in the combiner box is connected in parallel with contactor No. 2; Furthermore, the ports of the battery pack modules of group A and group B include discharge ports P+ / P-, and the charging ports include C+ / C-; the battery pack modules are connected to the junction box contactor through the discharge ports; and the battery pack modules are connected to the charging pile through the charging ports.

[0040] Furthermore, the battery management main controller BMS in the combiner box is connected to 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 at the same time receives the battery pack status information from the battery management slave controller BMS, including battery power, temperature, and voltage parameters.

[0041] This embodiment describes in detail the addition of a total battery management controller BMS in the battery pack junction box, and enables it to communicate with the BMS controller of each battery pack. This architecture 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 problem of uneven discharge that may occur due to the individual control of each battery pack, and ensuring the stability and reliability of the discharge process of the entire system. When multiple battery packs are discharged in parallel, the discharge task can be dynamically allocated according to the real-time status of each battery pack, such as power, temperature and other information, which extends the overall service life of the battery pack and improves the energy utilization efficiency of the system. At the same time, it also enhances the system's ability to cope with complex working conditions and faults. Once a battery pack is abnormal, the total BMS can respond quickly and adjust the discharge strategy to ensure the continuous and safe operation of the entire replaceable multi-battery pack parallel system.

[0042] The above are only preferred embodiments of the present invention, which do not limit the scope of protection of the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any changes, modifications, replacements, integrations and parameter changes to these embodiments within the spirit and principles of the present invention through conventional substitutions or without departing from the principles and spirit of the present invention fall within the scope of protection of the present invention.

Claims

1. A replaceable multi-battery pack parallel system, characterized in that: A battery pack system is included, wherein the battery pack system includes at least two groups of battery pack modules; the battery pack modules are connected in parallel; The battery pack module comprises an energy storage battery pack (1), a contactor, an anti-reverse 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 to a contactor and an anti-reverse diode through a circuit, and the other end is connected to an output port; the anti-reverse diode is connected in parallel with the contactor; and the other end of the contactor is connected to the output port; The battery management controller BMS is connected to the switching switch to execute the discharge switching of the battery pack; the battery management controller BMS is connected to the output port through the output detection point.

2. A replaceable multi-battery pack parallel system according to claim 1, characterized in that: The contactors of the battery pack module include contactor No. 1 and contactor No. 2, and the contactor No. 1 and contactor No. 2 are connected in series.

3. The replaceable multi-battery parallel system according to claim 1, characterized in that: The anti-reverse diode in the battery pack module can be freely switched between the parallel position of contactor No. 1 and contactor No. 2; when the anti-reverse diode is switched to contactor No. 1, the anode of the anti-reverse diode is connected to one end of contactor No. 1, and the cathode of the anti-reverse diode is connected to the output end of the energy storage battery group (1); when the anti-reverse diode is switched to contactor No. 2, the anode of the anti-reverse diode is connected to one end of contactor No. 2, and the cathode is connected to the output end.

4. The replaceable multi-battery parallel system according to claim 1, characterized in that: The output port of the battery pack module includes a port P+ and a port P-, and the output port is connected to 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 multi-battery parallel system according to claim 1, characterized in that: The battery management controller BMS of the battery pack module communicates with the BMS of other battery packs through the CAN bus; the battery management controller BMS controls the battery pack module to discharge independently or in parallel at the same time. During the battery pack switching discharge process of the battery pack module, the communication status of the battery management controller BMS of other battery pack modules and the fault information of the battery pack are used to determine whether to perform the switching operation; the battery management controller BMS is connected to contactor No. 1 and contactor No. 2 to control the opening and closing status of contactor No. 1 and contactor No. 2; during the discharge, the discharge contactor No. 1 is controlled to be closed and the contactor No. 2 is disconnected; During the charging, contactor No. 1 and contactor No. 2 are controlled to be closed.

6. A replaceable multi-battery parallel system, based on any one of claims 1-4, characterized in that: A battery pack system is included, wherein the battery pack system includes a combiner box and at least two groups of battery pack modules; The combiner box includes a pre-charging resistor, a contactor, an anti-reverse 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 anti-reverse diode in the combiner box is connected in parallel with the pre-charging resistor and the contactor, and the combiner box contactor is connected to the port of the battery pack module, and is connected to the main positive contactor of the battery pack module through the port; The battery management master controller BMS in the combiner box is provided with a battery pack control switch; the battery management master controller BMS is connected to the battery management slave controller BMS via CAN; One end of the battery pack module energy storage battery group (1) is connected to a main positive contactor, and the other end is connected to a main negative contactor; the main negative contactor is connected to a combiner box via a port.

7. The replaceable multi-battery parallel system according to claim 6, characterized in that: The combiner 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.

8. The replaceable multi-battery parallel system according to claim 6, characterized in that: The anti-reverse diode in the junction box can be freely switched between the parallel positions of contactor No. 1 and contactor No. 2; the anti-reverse diode is switched to contactor No. 1, the anode of the anti-reverse diode is connected to one end of contactor No. 2, and the cathode of the anti-reverse diode is connected to the port of the battery pack module; the anti-reverse diode is switched to contactor No. 2, the cathode of the anti-reverse diode is connected to one end of contactor No. 1, and the anode of the anti-reverse diode is connected to the port.

9. The replaceable multi-battery parallel system according to claim 6, characterized in that: The ports of the battery pack module include a discharge port P+ / P-, and a charging port includes C+ / C-; the battery pack module is connected to the combiner box contactor through the discharge port; and the battery pack module is connected to the charging pile through the charging port.

10. A replaceable multi-battery parallel system according to claim 9, characterized in that: The battery management master controller BMS in the combiner 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 at the same time receives the battery pack status information from the battery management slave controller BMS, including battery power, temperature, and voltage parameters.

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