Battery module and energy storage device

Abstract

The utility model discloses a battery module and an energy storage device, and the battery module is characterized in that the battery module comprises a first battery module which at least comprises a single battery and is used for being electrically connected with a DC bus; the second battery module at least comprises a single battery, the second battery module is used for being electrically connected with the direct current bus, and the electrical performance parameters of the first battery module and the second battery module are different; the first voltage regulating module is arranged between the first battery module and a line of the direct current bus, the first voltage regulating module at least comprises a DC / DC converter, the DC / DC converter is electrically connected with the single batteries and the direct current bus, and the first voltage regulating module is used for regulating the charging current and the discharging current of the first battery module; therefore, the capacities of the first battery module and the second battery module are balanced. The first voltage regulating module is connected with the first battery module, so that the capacity of the first battery module and the capacity of the second battery module are balanced, and the battery utilization rate is improved.

Description

Technical Field

[0001] The present application relates to the field of battery energy storage technology, and more specifically to a battery module and an energy storage device. Background Art

[0002] Under the energy crisis, electricity prices have been rising year by year, electricity costs have been rising, and the demand for renewable energy and energy storage for self-generation and self-use has grown rapidly, and the overseas household storage market has ushered in explosive growth. In addition, with the increasing popularity of electric vehicles, the shipment of power batteries has increased significantly. Generally, after several years of use, the capacity of electric vehicle power batteries will decay. Batteries with a certain degree of capacity decay can be retired. The retired batteries can be further used in energy storage systems in a cascade manner, which can not only maximize the utilization of battery energy and alleviate the pressure of handling a large number of retired waste batteries, but also reduce energy storage costs and avoid waste of resources.

[0003] However, if retired batteries are simply combined into modules for use, the battery utilization rate will be low due to inconsistencies between batteries and differences in electrical parameters between different batteries. Utility Model Content

[0004] The present application is proposed to solve the above-mentioned problems. According to one aspect of the present application, a battery module is provided, which includes: a first battery module, the first battery module includes at least one single battery cell, and the first battery module is used to be electrically connected to a DC bus; a second battery module, the second battery module includes at least one single battery cell, and the second battery module is used to be electrically connected to the DC bus, and the electrical performance parameters of the first battery module and the second battery module are different; a first voltage regulating module, the first voltage regulating module is arranged between the first battery module and the DC bus line, the first voltage regulating module includes at least one DC / DC converter, the DC / DC converter is electrically connected to the single battery cell and the DC bus, and the first voltage regulating module is used to adjust the charging current and the discharging current of the first battery module to balance the capacity of the first battery module and the second battery module.

[0005] As a preferred solution of the utility model, the battery module also includes a second voltage regulating module, which is arranged between the second battery module and the DC bus line. The second voltage regulating module includes at least one DC / DC converter, and the DC / DC converter is electrically connected to the single battery and the DC bus. The second voltage regulating module is used to adjust the charging current and discharging current of the second battery module to balance the capacity of the first battery module and the second battery module.

[0006] As a preferred solution of the present invention, the electrical performance parameter includes at least one of rated voltage, capacity, internal resistance and retention rate.

[0007] As a preferred solution of the present invention, the battery module further includes a first shell, and the first battery module and the first voltage regulating module are arranged inside the first shell.

[0008] As a preferred solution of the utility model, the first shell is equipped with a first plug-in terminal, the first end of the first plug-in terminal is electrically connected to the first battery module through the first voltage regulating module, and the second end of the first plug-in terminal is used to plug into the second plug-in terminal to electrically connect the first battery module to the DC bus.

[0009] On the other hand, the present application provides an energy storage device, which includes any one of the above-mentioned battery modules, the number of which is at least one, and the energy storage device also includes a box, at least one second plug-in terminal is provided along the first surface inside the box, the positive pole of the second plug-in terminal is electrically connected to the positive pole of the DC bus, and the negative pole of the second plug-in terminal is electrically connected to the negative pole of the DC bus.

[0010] As a preferred solution of the utility model, the second plug-in terminal is integrated inside the plug-in frame.

[0011] As a preferred solution of the present invention, a plurality of battery modules are electrically connected in sequence inside the energy storage device.

[0012] As a preferred solution of the utility model, the energy storage device also includes an energy storage inverter, one end of the energy storage inverter is electrically connected to the positive pole of the DC bus and the positive pole of the second plug-in terminal, and the other end of the energy storage inverter is electrically connected to the negative pole of the DC bus and the negative pole of the second plug-in terminal. The energy storage inverter is used to realize the conversion of direct current and alternating current.

[0013] As a preferred solution of the present utility model, the first voltage regulating module also includes a communication module, and the first voltage regulating module is electrically connected to the energy storage converter via the communication module.

[0014] like Figure 1 As shown, the battery module includes a first battery module 10, a second battery module 20, and a first voltage regulating module 11. The first battery module 10 includes at least one single battery, and the first battery module 10 is electrically connected to the DC bus 12. The second battery module 20 includes at least one single battery, and the second battery module 20 is electrically connected to the DC bus 12. The electrical performance parameters of the first battery module 10 and the second battery module 20 are different, and the electrical performance parameters mainly include the rated voltage, capacity, internal resistance and retention rate of the battery; the first voltage regulating module 11 is arranged between the first battery module 10 and the DC bus 12, and the first voltage regulating module 11 includes at least one DC / DC converter, and the DC / DC converter is electrically connected to the single battery and the DC bus 12. The first voltage regulating module 11 is used to adjust the charging current and the discharging current of the first battery module 10 to balance the capacity of the first battery module 10 and the second battery module 20.

[0015] Optional, such as Figure 2 As shown, the battery module also includes a second voltage regulating module 21, which is arranged between the second battery module 20 and the line of the DC bus 12. The second voltage regulating module 21 includes at least one DC / DC converter, and the DC / DC converter is electrically connected to the single battery and the DC bus 12. The second voltage regulating module 21 is used to adjust the charging current and the discharging current of the second battery module 20 to balance the capacity of the first battery module 10 and the second battery module 20.

[0016] Optional, such as Figure 3 As shown, the battery module also includes a first shell 100, the first battery module 10 and the first voltage regulating module 11 are arranged inside the first shell 100, the first shell 100 is equipped with a first plug-in terminal 13, the first end of the first plug-in terminal 13 is electrically connected to the first battery module 10 through the first voltage regulating module 11, and the second end of the first plug-in terminal 13 is used to plug in with the second plug-in terminal 23 to electrically connect the first battery module 10 to the DC bus 12.

[0017] Optional, such as Figure 4 As shown, the battery module also includes a second shell 200, the second battery module 20 and the second voltage regulating module 21 are arranged inside the second shell 200, and the second shell 200 is equipped with a first plug-in terminal 13, the first end of the first plug-in terminal 13 is electrically connected to the second battery module 20 through the second voltage regulating module 21, and the second end of the first plug-in terminal 13 is used to plug into the second plug-in terminal 23 to electrically connect the second battery module 20 to the DC bus 12.

[0018] like Figure 5 , Figure 6 As shown, the energy storage device 400 includes a battery module, the number of which is at least one, and the energy storage device 400 also includes a box body 300, at least one second plug-in terminal 23 is provided along the first surface inside the box body 300, the first surface refers to one of the large surfaces inside the device, the plug-in terminal 23 is integrated into the plug-in frame 24, the positive pole of the second plug-in terminal 23 is electrically connected to the positive pole of the DC bus 12, the negative pole of the second plug-in terminal 23 is electrically connected to the negative pole of the DC bus 12, and the second plug-in terminal 23 is plugged into the second end of the first plug-in terminal 13 to electrically connect the first battery module 10, the second battery module 20 and the DC bus 12.

[0019] like Figure 7As shown, the energy storage device 400 includes n battery modules, which are electrically connected in sequence inside the energy storage device 400. The energy storage device 400 also includes an energy storage inverter 14, one end of the energy storage inverter 14 is electrically connected to the positive pole of the DC bus 12 and the positive pole of the second plug-in terminal 23, and the other end of the energy storage inverter 14 is electrically connected to the negative pole of the DC bus 12 and the negative pole of the second plug-in terminal 23. The energy storage inverter 14 is used to realize the conversion of direct current and alternating current; the first voltage regulating module 11 also includes a communication module 15, and the first voltage regulating module 11 is electrically connected to the energy storage inverter 14 through the communication module 15.

[0020] A battery module and an energy storage device according to an embodiment of the present application have the following beneficial effects: the utility model connects a first voltage regulating module to a first battery module, and the first voltage regulating module adjusts the charging current and the discharging current of the first battery module, so that the capacities of the first battery module and the second battery module are balanced, thereby improving battery utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural block diagram of a battery module according to a specific embodiment of the present application.

[0022] Figure 2 It is a schematic structural block diagram of a battery module according to another specific embodiment of the present application.

[0023] Figure 3 It is a schematic structural block diagram of a battery module according to another specific embodiment of the present application.

[0024] Figure 4 It is a schematic structural block diagram of a battery module according to another specific embodiment of the present application.

[0025] Figure 5 It is a structural schematic diagram of an energy storage device according to a specific embodiment of the present application.

[0026] Figure 6 It is a structural schematic diagram of an energy storage device according to a specific embodiment of the present application.

[0027] Figure 7 It is a schematic structural block diagram of an energy storage device according to a specific embodiment of the present application. DETAILED DESCRIPTION

[0028] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features well known in the art are not described.

[0029] It should be understood that the present application can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present application to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0030] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as a second element, component, region, layer or part.

[0031] Spatially relative terms such as "under," "below," "below," "under," "above," "above," etc., may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that in addition to the orientations shown in the figures, the spatially relative terms are intended to include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "on" the other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0032] Some implementation methods of the present utility model are described in detail below in conjunction with the accompanying drawings.

[0033] like Figure 7 As shown, the entire system consists of an energy storage device 400 , an energy storage converter 14 and a communication module 15 .

[0034] in:

[0035] The energy storage device includes a first battery module 10, a first voltage regulating module 11, and a first plug-in terminal 13. The first battery module 10 is composed of a single large-capacity lithium iron phosphate battery. The first voltage regulating module 11 includes at least one DC / DC converter. The first voltage regulating module 11 is arranged between the first battery module 10 and the circuit of the first plug-in terminal 13. The first battery module 10, the first voltage regulating module 11 and the first plug-in terminal 13 are arranged inside the first shell 100; the energy storage device also includes a second battery module 20 and a second voltage regulating module 21. The second battery module 20 is composed of a single large-capacity lithium iron phosphate battery. The electrical performance parameters of the second battery module 20 and the first battery module 10 are different. The electrical performance parameters refer to at least one of the rated voltage, capacity, internal resistance and retention rate. The second voltage regulating module 21 includes at least one DC / DC converter. The second voltage regulating module 21 is set It is placed between the second battery module 20 and the circuit of the first plug-in terminal 13, and the second battery module 20, the second voltage regulating module 21 and the first plug-in terminal 13 are arranged inside the second shell 200; the first voltage regulating module 11 is used to adjust the charging current and the discharging current of the first battery module 10 so that the capacity of the first battery module 10 and the second battery module 20 are balanced; the second voltage regulating module 21 is used to adjust the charging current and the discharging current of the second battery module 20 so that the capacity of the first battery module 10 and the second battery module 20 are balanced; the energy storage device also includes a box body 300, and at least one second plug-in terminal 23 is arranged inside the box body 300 along the first surface, and the second plug-in terminal 23 is integrated in the plug-in frame 24, the positive pole of the second plug-in terminal 23 is electrically connected to the positive pole of the DC bus 12, and the negative pole of the second plug-in terminal 23 is electrically connected to the negative pole of the DC bus 12. As the energy storage unit of the whole system, the battery storage energy can be flexibly configured within 6-20kwh, and the large-capacity battery capacity is generally 200-320Ah, and 10-20 battery modules can be configured; the DC / DC is a bidirectional converter, which can realize the charging and discharging of the battery. The DC / DC power can be configured according to 600W, and the maximum current design of the battery side is 222A (600W / 2.7V=222A). The battery module is equipped with a first plug-in terminal 13, which can realize blind plug-in operation in the system plug-in frame 24; the DC bus 12 can be designed as The system is in the form of a plug-in frame 24, in which the second plug-in terminal 23 of the DC positive and negative busbars is designed to realize blind plug-in of the battery module. The number of plug-in frames 24 is configured at a maximum of 20. The second plug-in terminal 23 is connected to the RS485 communication line 15. Each second plug-in terminal 23 communicates with the energy storage inverter 14 after being hand-in-hand connected to the communication line 15. The system energy storage inverter 14 is configured at 5kw power. The energy storage inverter 14 is connected to the DC bus 12. The energy storage inverter 14 is responsible for converting the high-voltage DC power into the AC power required for household use and realizing two-way energy flow.

[0036] How the whole system works:

[0037] During the power trough period of the power grid, the AC load is powered by the power grid. At the same time, the energy storage converter 14 communicates with the DC / DC of the first battery module 10 and the second battery module 20 to obtain the battery status information. When a battery needs to be supplemented, the energy storage converter 14 and the DC / DC of this battery work. After the power grid converts the AC power into high-voltage DC power through the energy storage converter 14, the high-voltage DC power is stepped down into a voltage platform suitable for a single battery through the DC / DC circuit to supplement the battery module. During the power peak period of the power grid, the first battery module 10 and the second battery module 20 communicate with the DC / DC of the first battery module 10 and the second battery module 20 to obtain the battery status information. When a battery needs to be supplemented, the energy storage converter 14 and the DC / DC of this battery work. After the power grid converts the AC power into high-voltage DC power through the energy storage converter 14, the high-voltage DC power is stepped down into a voltage platform suitable for a single battery through the DC / DC circuit to supplement the battery module. The first battery module 10 and the second battery module 20 are boosted to a high voltage adapted to the energy storage inverter 14 through DC / DC, and the high voltage is then converted into AC power for use by the AC load through the energy storage inverter 14, and the surplus electric energy can be fed back to the power grid; when an alarm / protection abnormality occurs in a single battery module in the battery module, the DC / DC in the battery module can control this line to directly cut off the power, and the system operation is not affected. The user can notify after-sales service or replace the battery module by himself according to the alarm information. Self-replacement can be hot-swapped when the system is in working state.

[0038] The utility model connects a first voltage regulating module with a first battery module, and the first voltage regulating module regulates the charging current and the discharging current of the first battery module, so that the capacity of the first battery module and the second battery module are balanced, so as to extend the battery life and improve the battery utilization rate; at the same time, the battery module plus the DC / DC can be made into a standard module, equipped with plug-in terminals, and is easy to install and maintain; the battery module plus the DC / DC standard module is connected in parallel to the high-voltage DC bus, and the system capacity can be flexibly configured according to the user, and the number of parallel battery modules can be increased or decreased; the addition and subtraction of battery modules in the system can be realized by hot plugging, the system operation is not affected, and maintenance is convenient.

[0039] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0040] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various application aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the application point is that the corresponding technical problem can be solved with less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0041] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0042] It should be noted that the above embodiments illustrate rather than limit the present application, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be construed as a limitation to the claims. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

Claims

1. A battery module, characterized in that: The battery module comprises: A first battery module, the first battery module comprising at least one single battery, the first battery module being used to be electrically connected to a DC bus; a second battery module, wherein the second battery module comprises at least one single battery, the second battery module is used to be electrically connected to the DC bus, and the first battery module and the second battery module have different electrical performance parameters; A first voltage regulating module, wherein the first voltage regulating module is arranged between the first battery module and the line of the DC bus, the first voltage regulating module comprises at least one DC / DC converter, the DC / DC converter is electrically connected to the single cell and the DC bus, and the first voltage regulating module is used to adjust the charging current and the discharging current of the first battery module so as to balance the capacity of the first battery module and the second battery module.

2. The battery module according to claim 1, characterized in that: The battery module further comprises: A second voltage regulating module, wherein the second voltage regulating module is arranged between the second battery module and the line of the DC bus, the second voltage regulating module comprises at least one DC / DC converter, the DC / DC converter is electrically connected to the single cell and the DC bus, and the second voltage regulating module is used to adjust the charging current and discharging current of the second battery module so as to balance the capacity of the first battery module and the second battery module.

3. The battery module according to claim 1 or 2, characterized in that: The electrical performance parameter includes at least one of rated voltage, capacity, internal resistance and retention rate.

4. The battery module according to any one of claims 1 to 3, characterized in that: The battery module further comprises: A first shell, wherein the first battery module and the first voltage regulating module are arranged inside the first shell.

5. The battery module according to claim 4, characterized in that: The first shell is equipped with a first plug-in terminal, a first end of the first plug-in terminal is electrically connected to the first battery module through the first voltage regulating module, and a second end of the first plug-in terminal is used to be plugged into a second plug-in terminal to electrically connect the first battery module to the DC bus.

6. An energy storage device, characterized in that: The energy storage device comprises the battery module according to any one of claims 1 to 5, the number of the battery module is at least one, and the energy storage device further comprises: A box body is provided with at least one second plug-in terminal along the first surface inside the box body, the positive pole of the second plug-in terminal is electrically connected to the positive pole of the DC bus, and the negative pole of the second plug-in terminal is electrically connected to the negative pole of the DC bus.

7. The energy storage device according to claim 6, characterized in that: The second plug-in terminal is integrated inside the plug-in frame.

8. The energy storage device according to claim 6 or 7, characterized in that: The multiple battery modules are electrically connected in sequence inside the energy storage device.

9. The energy storage device according to claim 8, characterized in that: The energy storage device also includes: An energy storage converter, one end of the energy storage converter is electrically connected to the positive pole of the DC bus and the positive pole of the second plug-in terminal, and the other end of the energy storage converter is electrically connected to the negative pole of the DC bus and the negative pole of the second plug-in terminal. The energy storage converter is used to realize direct current to alternating current conversion.

10. The energy storage device according to claim 9, characterized in that: The first voltage regulating module also includes a communication module, and the first voltage regulating module is electrically connected to the energy storage converter via the communication module.

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