Battery power supply system

Abstract

The utility model provides a battery power supply system. The battery power supply system comprises a power supply module; the power supply module comprises a battery cell and a DC / DC bidirectional module, the battery cell is connected with an external load through the DC / DC bidirectional module, and the DC / DC bidirectional module is provided with a first end connected with the battery cell and a second end connected with the external load; the external charging module can be connected between external power supply equipment and the second end so as to charge the battery core; and the DC / DC bidirectional module can increase the voltage output by the battery cell by a preset multiple, or reduce the voltage supplied to the power supply module by the external charging module by the preset multiple. According to the utility model, the structure is simple, the cost is relatively low, the popularization and the application are easy, the DC / DC bidirectional module is arranged, so that the voltage output by a single battery cell can meet the voltage requirement of an external load, the application scene of a battery which is decommissioned and cannot meet the application requirement of an energy storage product in production quality is expanded, and the charging time is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery power supply system. Background Art

[0002] With the rapid development of the energy storage industry, the capacity of energy storage cells is getting larger and larger, the cycle life can reach 15,000 times, and the cost is getting lower and lower. With the application of large-capacity iron-lithium batteries, the number of retired batteries and batteries whose production quality does not meet the application requirements of energy storage products will continue to increase. How to apply these large-capacity batteries whose quality fully meets the civilian requirements has become a difficult problem that needs to be solved urgently. In the prior art, although there are devices for applying retired iron-lithium batteries, their structure is generally more complicated, and the application cost is generally high, which is not conducive to promotion. Utility Model Content

[0003] In view of this, the utility model aims to propose a battery power supply system to facilitate the utilization of retired batteries or batteries whose production quality does not meet the application requirements of energy storage products, and the application cost is low.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A battery powered system comprises a power module;

[0006] The power module includes a battery cell and a DC / DC bidirectional module, the battery cell is connected to an external load through the DC / DC bidirectional module, and the DC / DC bidirectional module has a first end connected to the battery cell and a second end connected to the external load;

[0007] The external charging module can be connected between the external power supply device and the second end to charge the battery cell;

[0008] The DC / DC bidirectional module can increase the voltage output by the battery cell by a preset multiple, and reduce the voltage supplied by the external charging module to the power module by the preset multiple.

[0009] Furthermore, the battery cell is a lithium iron battery cell, and the preset multiple is 3.5 to 4.5.

[0010] Furthermore, the external charging module includes four battery chargers.

[0011] Furthermore, the battery cell is a ternary battery cell, and the preset multiple is between 2.5 and 3.5.

[0012] Furthermore, the external charging module includes a three-string battery charger.

[0013] Furthermore, the power module includes a plurality of the battery cells arranged in parallel.

[0014] Furthermore, the power supply modules are multiple and arranged side by side, and the multiple power supply modules jointly supply power to the external load.

[0015] Furthermore, the external load is an AC load, and the power supply module also includes a DC / AC module connected between the second end and the AC load, and the DC / AC module is used to convert the voltage of the second end into the AC voltage required by the AC load.

[0016] Furthermore, the external load is a DC load, and the power supply module also includes a DC / DC unidirectional module connected between the second end and the DC load, and the DC / DC unidirectional module is used to convert the voltage of the second end into a DC voltage required by the DC load.

[0017] Furthermore, the DC load is a power system of a low-speed electric vehicle, and the output end of the DC / DC unidirectional module is connected in parallel between the positive and negative electrodes of a battery pack of the power system.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] The battery power supply system described in the utility model includes a power module, which has a simple structure, low cost, and is easy to promote and apply. In addition, by providing a DC / DC bidirectional module, the voltage output by a single battery cell can meet the voltage requirement of an external load, which is convenient for realizing the application of a single battery cell, and is conducive to expanding the application scenarios of retired batteries and batteries whose quality does not meet the application requirements of energy storage products, and is convenient for fully consuming and utilizing the cascaded utilization or poor battery cells generated by the energy storage industry. The system has a long service life and a low comprehensive use cost. In addition, the external charging module is connected to the battery cell through the DC / DC bidirectional module, which is conducive to amplifying the charging current and shortening the charging time.

[0020] In addition, the battery cell can be a lithium iron battery cell, and the preset multiple is 3.5 to 4.5, which is conducive to making the battery power supply system have a higher working efficiency and a lower comprehensive use cost. In addition, by making the external charging module include a four-string battery charger, it is convenient to meet the charging voltage requirements of the battery cell and ensure the charging efficiency.

[0021] In addition, by making the power module include multiple cells arranged in parallel, the capacity of the power module is improved. And by making the power module be multiple and arranged in parallel, the power supplied by the battery power supply system to the external load is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the battery power supply system according to an embodiment of the utility model supplying power to an AC load;

[0024] Figure 2 This is a schematic diagram of the battery power supply system according to an embodiment of the utility model supplying power to the power system of a low-speed electric vehicle;

[0025] Figure 3 A schematic diagram of a power module of a battery power supply system according to an embodiment of the utility model having two parallel-connected battery cells;

[0026] Figure 4 This is a schematic diagram of two power modules described in an embodiment of the utility model arranged side by side.

[0027] Description of reference numerals:

[0028] 1. Battery cell; 2. DC / DC bidirectional module; 201. First end; 202. Second end; 3. External charging module; 4. DC / AC module; 5. DC / DC unidirectional module; 6. Battery pack; 7. Motor; 8. Fuse. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0033] This embodiment relates to a battery powered system, the overall structure of which is as follows: Figure 1 and Figure 2 As shown in , the battery power supply system includes a power module, and the power module includes a battery cell 1 and a DC / DC bidirectional module 2. The battery cell 1 is connected to an external load through the DC / DC bidirectional module 2, and the DC / DC bidirectional module 2 has a first end 201 connected to the battery cell 1, and a second end 202 connected to the external load. The external charging module 3 can be connected between an external power supply device and the second end 202 to charge the battery cell 1. The DC / DC bidirectional module 2 can increase the voltage output by the battery cell 1 by a preset multiple, and reduce the voltage supplied by the external charging module 3 to the power module by a preset multiple.

[0034] It can be understood that by making the battery power supply system include a power module and an external charging module 3, and making the power module include a battery cell 1 and a DC / DC bidirectional module 2, the structure is simple, the cost is low, and it is easy to promote and apply. By providing a DC / DC bidirectional module 2, it is beneficial for the voltage output of a single battery cell 1 to meet the voltage requirement of the external load, which is convenient for realizing the application of a single battery cell 1, and is beneficial for expanding the application scenarios of the battery, and is convenient for fully consuming and utilizing the cascade utilization or bad battery cells generated by the energy storage industry, and the system has a long service life and a low comprehensive use cost. And the external charging module 3 is connected to the battery cell 1 through the DC / DC bidirectional module 2, which is beneficial for amplifying the charging current and shortening the charging time.

[0035] In addition, it should be emphasized that since the present embodiment can be made into a power module through a single battery cell, at this time, the life of a single battery cell is basically the life of the entire battery power supply system. Generally, the cycle of the energy storage battery cell can reach tens of thousands of times. Therefore, making a power module through a single battery cell is beneficial to improving the system life and reducing the overall use cost of the system.

[0036] Based on the above overall introduction, as a preferred implementation, in this embodiment, the battery cell 1 can be an iron-lithium battery cell 1, and the preset multiple is 3.5 to 4.5, which can be specifically 3.5, 3.8, 4, and 4.5. In this way, it is beneficial to make the working efficiency of the battery power supply system higher and the comprehensive use cost lower. And in this embodiment, it is further preferred to make the preset multiple 4, and the above-mentioned output of the battery cell 1 increases the preset multiple, that is, the voltage output by the battery cell can be increased to 4 times the original through the DC / DC bidirectional module 2. And the above-mentioned voltage supplied to the power module by the external charging module 3 is reduced by a preset multiple, that is, the voltage output by the external charging module 3 can be reduced to 1 / 4 of the original through the DC / DC bidirectional module 2.

[0037] Preferably, when the battery cell 1 is a lithium iron battery cell, the external charging module 3 may include a four-string battery charger. In this way, it is convenient to meet the charging voltage requirements of the battery cell 1 and ensure charging efficiency. In specific use, the four-string battery charger may be a four-string lithium iron battery charger commonly used in the prior art, whose output voltage is generally 14.6V and output current is 1A to 10A. If the charging power can meet the conditions, the DC / DC bidirectional module 2 can amplify the charging current to a maximum of 40A, thereby facilitating shortening the charging time.

[0038] It is worth noting that the above-mentioned use of the battery cell 1 as an iron-lithium battery cell is only used as a preferred implementation. In addition, the battery cell 1 can also be selected as a ternary battery cell. At this time, the preset multiple is 2.5 to 3.5, and can be specifically 2.5, 2.8, 3, 3.5, etc. In this way, it is beneficial to make the working efficiency of the battery power supply system higher and the comprehensive use cost lower. And in this embodiment, it is further preferred that the preset multiple is 3. Moreover, when the battery cell 1 is a ternary battery cell 1, the external charging module 3 can preferably include a three-string battery charger to meet the charging voltage requirements of the battery cell 1 and ensure the charging efficiency. And the three-string battery charger can be selected from the corresponding devices commonly used in the prior art, which will not be described in detail here.

[0039] As a preferred implementation, in this embodiment, the power module includes a plurality of battery cells 1 arranged in parallel. In specific implementation, the number of battery cells 1 arranged in parallel may be two, three, four, five, six, etc. Figure 3 As shown in , two battery cells 1 are arranged in parallel as an example for explanation. At this time, the two battery cells 1 can jointly supply power to the external load, thereby facilitating the capacity of the power module.

[0040] In addition, as a preferred embodiment, the power supply modules can be arranged in parallel in a plurality, and the plurality of power supply modules can jointly supply power to the external load. In specific implementation, the power supply modules can be arranged in parallel in two, three, four, five or six. Figure 4 As shown in , two power modules are arranged in parallel as an example for explanation. At this time, the two power modules jointly supply power to the external load, which is beneficial to improving the power supplied to the external load.

[0041] As a preferred implementation, the external load can be an AC load. In this case, the power module further includes a DC / AC module 4 connected between the second end 202 and the AC load. The DC / AC module 4 is used to convert the voltage of the second end 202 into an AC voltage required by the AC load. By providing the DC / AC module 4, it is convenient to provide the required voltage to the AC load.

[0042] When used specifically, the output side of the DC / AC module 4 can be AC220V, and an externally adapted AC load can be connected, such as the battery-powered system can be used as a household emergency power supply, or can be used to power special medical equipment, such as a ventilator, a medicine refrigerator, etc. Of course, in other embodiments, the voltage on the output side of the DC / AC module 4 can also be set to other values, which can be selected according to the load requirements.

[0043] In addition, the external load can also be a DC load. In this case, the power supply module further includes a DC / DC unidirectional module 5 connected between the second end 202 and the DC load. The DC / DC unidirectional module 5 is used to convert the voltage of the second end 202 into a DC voltage required by the DC load. By providing the DC / DC unidirectional module 5, it is convenient to provide the required DC voltage to the DC load.

[0044] As a preferred implementation method, Figure 2 As shown in , when the external load is a DC load, the DC load can be the power system of the low-speed electric vehicle, and the output end of the DC / DC unidirectional module 5 is connected in parallel between the positive and negative electrodes of the battery pack 6 of the power system. In specific implementation, the battery pack 6 supplies power to the motor 7, so that the power supply system can charge the battery pack 6, and the power supply system and the battery pack 6 can also supply power to the motor 7 together, so as to supplement the power and extend the range of the low-speed electric vehicle, reduce the load of the battery pack 6, and increase its service life.

[0045] It should be noted that the DC / DC bidirectional module 2, DC / DC unidirectional module 5 and DC / AC module 4 can all be made of related standard components commonly used in the prior art, with simple structure and low cost. When selecting, a DC / DC bidirectional module 2 with over-voltage and under-voltage protection function can be selected to protect the circuit, and a fuse 8 can be connected between the battery cell 1 and the DC / DC bidirectional module 2.

[0046] The battery power supply system of this embodiment has a simple structure, low cost, and is easy to promote and apply. Moreover, by providing a DC / DC bidirectional module 2, it is beneficial to improve the power supply efficiency of the system, and it is convenient to make the voltage output by a single battery cell 1 meet the voltage requirements of the external load, and it is convenient to realize the application of a single battery cell 1, and it is beneficial to expand the application scenarios of retired batteries and batteries whose quality cannot meet the energy storage requirements, and it is convenient to fully consume and utilize the cascade utilization or bad batteries generated by the energy storage industry, and the system has a long service life, a low comprehensive use cost, and can amplify the current for charging the battery cell and shorten the charging time.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery powered system, Features: Including power module; The power module includes a battery cell and a DC / DC bidirectional module, the battery cell is connected to an external load through the DC / DC bidirectional module, and the DC / DC bidirectional module has a first end connected to the battery cell and a second end connected to the external load; The external charging module can be connected between the external power supply device and the second end to charge the battery cell; The DC / DC bidirectional module can increase the voltage output by the battery cell by a preset multiple, and reduce the voltage supplied by the external charging module to the power module by the preset multiple.

2. The battery powered system according to claim 1, Features: The battery cell is a lithium iron battery cell, and the preset multiple is between 3.5 and 4.

5.

3. The battery powered system according to claim 2, Features: The external charging module includes a four-string battery charger.

4. The battery powered system according to claim 1, Features: The battery cell is a ternary battery cell, and the preset multiple is between 2.5 and 3.

5.

5. The battery powered system according to claim 4, Features: The external charging module includes a three-string battery charger.

6. The battery powered system according to claim 1, Features: The power module includes a plurality of battery cells arranged in parallel.

7. The battery powered system according to claim 1, Features: There are a plurality of power modules arranged side by side, and the plurality of power modules jointly supply power to the external load.

8. The battery powered system according to claim 1, Features: The external load is an AC load, and the power supply module further includes a DC / AC module connected between the second end and the AC load, and the DC / AC module is used to convert the voltage of the second end into an AC voltage required by the AC load.

9. The battery powered system according to claim 1, Features: The external load is a DC load, and the power supply module further includes a DC / DC unidirectional module connected between the second end and the DC load, and the DC / DC unidirectional module is used to convert the voltage of the second end into a DC voltage required by the DC load.

10. The battery powered system according to claim 9, Features: The DC load is a power system of a low-speed electric vehicle, and the output end of the DC / DC unidirectional module is connected in parallel between the positive and negative electrodes of a battery pack of the power system.

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