Lithium battery system supporting capacity expansion

Abstract

The utility model relates to a lithium battery system supporting capacity expansion, which comprises a high-voltage box and one or a plurality of lithium battery boxes connected to the high-voltage box, the high-voltage box and the lithium battery boxes are mutually independent, and the plurality of lithium battery boxes are connected into the high-voltage box in parallel; the high-voltage box comprises a box body, a BMS main control module is arranged in the box body, and a plurality of battery connection interfaces, a charging and discharging output interface and a charging and discharging communication interface which are electrically connected with the BMS main control module are arranged on the outer side of the box body; each lithium battery box comprises a battery core and a BMS slave control module connected with the battery core, the BMS slave control module is used for collecting a working signal of the battery box, each lithium battery box is connected to one battery connection interface of the high-voltage box, and communication connection between the BMS slave control module and the BMS master control module is established. According to the scheme, the battery capacity provided by the lithium battery system is the total amount of the battery capacities of all accessed lithium battery boxes, so that different battery capacities can be provided, and capacity expansion is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery systems, and in particular to a lithium battery system supporting capacity expansion. Background Art

[0002] Lithium battery forklifts have the characteristics of fast charging, and using intermittent charging can meet the needs of long battery life, but there are the following shortcomings:

[0003] The charging process requires a certain amount of time. During the charging process, the lithium battery forklift cannot continue to perform the handling work and cannot guarantee continuous operation. In particular, for some usage scenarios, no charging equipment is set up and it is impossible to charge and replenish the power. The batteries in existing lithium battery forklifts are provided with different battery capacities in advance. Once the battery is assembled, the battery capacity cannot be changed. In addition, the large-capacity battery itself has a large volume and weight, which is not easy to replace. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present utility model is to provide a lithium battery system that supports capacity expansion.

[0005] A lithium battery system supporting capacity expansion includes a high-voltage box and one or more lithium battery boxes connected to the high-voltage box, wherein the high-voltage box and the lithium battery box are independent of each other, and a plurality of lithium battery boxes are connected to the high-voltage box in parallel;

[0006] The high-voltage box includes a box body, a BMS main control module is arranged in the box body, and a plurality of battery connection interfaces, a charge and discharge output interface and a charge and discharge communication interface electrically connected to the BMS main control module are arranged on the outside of the box body;

[0007] The lithium battery box includes a battery cell and a BMS slave control module connected to the battery cell. The BMS slave control module is used to collect the working signal of the battery box. Each lithium battery box is connected to a battery connection interface of the high-voltage box and establishes a communication connection between the BMS slave control module and the BMS master control module.

[0008] The lithium battery system of the above structure divides the BMS battery management module into two parts: the main control module and the slave control module. The slave control part collects the working status information of the battery box, and the main control manages the battery box according to the information collected by the slave control part. Different numbers of lithium battery boxes can be connected according to needs. The battery capacity provided by the lithium battery system is the total battery capacity of all connected lithium battery boxes, so that different battery capacities can be provided to achieve capacity expansion. In addition, the access of the lithium battery box and the expansion of the lithium battery system can be achieved by connecting the battery box to the battery connection interface of the high-voltage box, and the access method is convenient.

[0009] Preferably, the battery capacity and structure of the multiple lithium battery boxes connected to the high-voltage box are the same. In this way, the lithium battery boxes are standardized and easy to use, and by setting the appropriate size of the lithium battery box, the battery can be replaced without the help of tools, which is easy to operate.

[0010] Preferably, the high-voltage box includes a display module, and an opening for exposing the display module is provided on the box body of the high-voltage box; the display module is connected to the BMS main control module to display the working status information of the connected lithium battery box. The display module is provided to facilitate the user to observe the working status such as the power in the lithium battery system, and facilitate inspection and maintenance.

[0011] Preferably, a control button is provided on one side of the display module, and the control button is connected to the BMS main control module, and is used to activate the lithium battery box connected to the high-voltage box to display the working status information of the lithium battery box through the display module. By setting a button to control the display device to display the working status of the lithium battery box, it is convenient for users to view specific information items.

[0012] Preferably, all or part of the electrical components in the high-voltage box are electrically connected through copper bars, and the copper bars are separated from the box body by resin insulators. The copper bars are used for connection, and the circuit connection structure is simple and compact, and the copper bars are separated from the box body by resin insulators to prevent direct contact between the copper bars and the box body, thereby ensuring circuit safety.

[0013] Preferably, the high-voltage box includes a box body with an opening at the upper end and a cover plate closing the box body opening from the upper end, wherein the cover plate is fixed to the box body, and a waterproof rubber strip is provided between the cover plate and the box body. The box body is arranged as above, and the electrical components in the box body are convenient to install, and the waterproof rubber strip is provided between the cover plate and the box body, which can play a waterproof and dustproof role.

[0014] Preferably, a plurality of first connection brackets are provided on the high-voltage box, the bottom of the first connection brackets is flush with the bottom of the high-voltage box, the first connection brackets are arranged in a U-shape, and connection holes are arranged at the bottom of the first connection brackets. By arranging the first connection brackets for fixing the high-voltage box, the connection parts for fixing the high-voltage box will not extend into the interior of the high-voltage box, thereby ensuring the sealing of the high-voltage box and improving the reliability of use.

[0015] Preferably, a second connecting bracket is provided on the lithium battery box, and the lithium battery box is fixed to the frame at the second connecting bracket by a threaded connector, and the second connecting bracket and the connecting interface of the lithium battery box and the high-voltage box are arranged on the same side of the lithium battery box. By setting the second connecting bracket to fix the lithium battery box, there is no need to set another connecting hole at the bottom of the lithium battery box, which is convenient for processing, and the second bracket and the connecting interface on the lithium battery box are arranged on the same side, and the overall structure of the lithium battery box is compact.

[0016] Preferably, the lithium battery box is provided with a handle, which makes it easier to carry the battery box.

[0017] Due to the above structure, the utility model can connect different numbers of lithium battery boxes as needed. The battery capacity provided by the lithium battery system is the total battery capacity of all connected lithium battery boxes, so that different battery capacities can be provided to achieve capacity expansion. In addition, the access to the lithium battery box and the expansion of the lithium battery system can be achieved by connecting the battery box to the battery connection interface of the high-voltage box, and the access method is convenient. It can also reduce the volume of a single battery box, and can carry the battery box without the aid of tools, making it easy to replace the lithium battery box. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the high voltage box in this application;

[0019] Figure 2 This is a schematic diagram of the structure of the high-voltage box after the cover is opened;

[0020] Figure 3 It is a structural schematic diagram of a lithium battery box;

[0021] Figure 4 Schematic diagram of the internal structure of the lithium battery box.

[0022] Reference numerals:

[0023] High voltage box 1, box body 11, cover plate 12, BMS main control module 13, battery connection interface 14, charge and discharge output interface 15, charge and discharge communication interface 16, display module 17, control button 18, first connection bracket 19,

[0024] Lithium battery box 2, battery cell 21, BMS slave control module 22, second connecting bracket 23, handle 24. DETAILED DESCRIPTION

[0025] The embodiments of the present utility model are described in detail below.

[0026] This embodiment includes a lithium battery system that supports capacity expansion, including a high-voltage box 1 and one or more lithium battery boxes 2 connected to the high-voltage box 1, the high-voltage box 1 and the lithium battery box 2 are independent of each other, and multiple lithium battery boxes 2 are connected to the high-voltage box 1 in parallel, and the capacity that the lithium battery system can provide is the sum of the capacities of all lithium battery boxes 2 connected to the high-voltage box 1, so capacity expansion can be achieved by controlling the number of connected lithium battery boxes 2, and users can set the number of connected lithium battery boxes 2 according to actual needs.

[0027] like Figure 1-2As shown, the high-voltage box 1 includes a box body 11, a BMS main control module 13 is arranged inside the box body 11, and a plurality of battery connection interfaces 14, a charge and discharge output interface 15 and a charge and discharge communication interface 16 electrically connected to the BMS main control module 13 are arranged on the outside of the box body 11. The battery connection interface 14 is used to connect to the lithium battery box 2, and collect the working status information of the lithium battery box 2 connected to the interface to the BMS main control module 13. The charge and discharge output interface 15 and the charge and discharge communication interface 16 are connected to the vehicle control system and the charger equipped with the lithium battery system. The charge and discharge output interface 15 and the charge and discharge communication interface 16 are conventional modules of vehicle-mounted lithium battery systems such as transport vehicles, and their structures and functions are not described in detail.

[0028] like Figure 3 As shown, the lithium battery box 2 includes a battery cell and a BMS slave control module 22 connected to the battery cell, and the BMS slave control module 22 is used to collect the working signal of the battery box. Each lithium battery box 2 is connected to a battery connection interface 14 of the high-voltage box 1, and a communication connection between the BMS slave control module 22 and the BMS master control module 13 is established. In the embodiment, a high-voltage box 1 connection interface is provided on the lithium battery box 2, and the high-voltage box 1 connection interface of the lithium battery and the battery connection interface 14 of the high-voltage box 1 are connected through a signal line to realize the access of the lithium battery box 2, and establish communication between the lithium battery box 2 and the high-voltage box 1, and realize the signal transmission between the BMS master control module 13 and the BMS slave control module 22. Preferably, the battery capacity and structure of each lithium battery box 2 are set to be the same, and the lithium battery box 2 is standardized, which is convenient for processing and management, and different battery capacity combinations can be provided through standard lithium batteries. In addition, by reasonably setting the capacity and volume of the lithium battery box 2, the lithium battery box 2 can be replaced without the help of tools, which is convenient for replacement. Preferably, a handle 24 is provided on the lithium battery box 2 to facilitate carrying the lithium battery box 2 .

[0029] like Figure 2 As shown, the high-voltage box 1 includes a display module 17, and an opening for exposing the display module 17 is provided on the box body 11 of the high-voltage box 1; the display module 17 is connected to the BMS main control module 13 to display the working status information of the connected lithium battery box 2. The display module 17 is provided to facilitate the user to observe the working status such as the power in the lithium battery system, and facilitates inspection and maintenance, especially when the lithium battery system is not mounted on the vehicle for use, it is convenient to check the working status of the lithium battery box 2.

[0030] Optionally, a control button 18 is provided on one side of the display module 17, and the control button 18 is connected to the BMS main control module 13, and is used to activate the lithium battery box 2 connected to the high-voltage box 1 to display the working status information of the lithium battery box 2 through the display module 17. By setting a button to control the display device to display the working status of the lithium battery box 2, it is convenient for users to view specific information items. In specific use, the charging and discharging of the lithium battery box 2 is controlled by the vehicle control system, and the activated battery here is only used to control the viewing of the status information of the lithium battery box 2.

[0031] like Figure 2 As shown, all or part of the electrical components in the box body 11 of the high-voltage box 1 are electrically connected through copper bars, and the copper bars are separated from the box body 11 by resin insulators. The overall circuit is more concise when connected through copper bars. Optionally, the electrical components can also be connected through electrical connecting wires, and a wiring harness device for fixing the internal wiring harness is provided on the box body 11 to prevent the wiring harness from moving inside the box body 11.

[0032] In this embodiment, the high-voltage box 1 includes a box body 11 with an opening at the upper end and a cover plate 12 that closes the opening of the box body 11 from the upper end, the cover plate 12 is fixed on the box body 11, and a waterproof rubber strip is provided between the cover plate 12 and the box body 11. The box body 11 is arranged as described above, so that the electrical components in the box body 11 are convenient to install, and the waterproof rubber strip is provided between the cover plate 12 and the box body 11, which can play a waterproof and dustproof role. A plurality of first connecting brackets 19 are provided on the outside of the high-voltage box 1, the bottom of the first connecting bracket 19 is flush with the bottom of the high-voltage box 1, the first connecting bracket 19 is arranged in a U shape, and a connecting hole is provided at the bottom of the first connecting bracket 19. By providing the first connecting bracket 19 for fixing the high-voltage box 1, the connecting piece for fixing the high-voltage box 1 will not extend into the interior of the high-voltage box 1, so that the sealing of the high-voltage box 1 can be ensured and the reliability of use can be improved.

[0033] like Figure 3 As shown, the lithium battery box 2 is provided with a second connection bracket 23, and the lithium battery box 2 is fixed to the vehicle frame at the second connection bracket 23 by a threaded connector, and the second connection bracket 23 and the connection interface between the lithium battery box 2 and the high-voltage box 1 are arranged on the same side of the lithium battery box 2. By setting the second connection bracket 23 to fix the lithium battery box 2, there is no need to set another connection hole at the bottom of the lithium battery box 2, which is convenient for processing, and the second bracket and the connection interface on the lithium battery box 2 are arranged on the same side, and the overall structure of the lithium battery box 2 is compact.

[0034] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A lithium battery system supporting capacity expansion, characterized in that: It includes a high-voltage box and one or more lithium battery boxes connected to the high-voltage box, wherein the high-voltage box and the lithium battery box are independent of each other, and a plurality of lithium battery boxes are connected to the high-voltage box in parallel; The high-voltage box includes a box body, a BMS main control module is arranged in the box body, and a plurality of battery connection interfaces, a charge and discharge output interface and a charge and discharge communication interface electrically connected to the BMS main control module are arranged on the outside of the box body; The lithium battery box includes a battery cell and a BMS slave control module connected to the battery cell. The BMS slave control module is used to collect the working signal of the battery box. Each lithium battery box is connected to a battery connection interface of the high-voltage box and establishes a communication connection between the BMS slave control module and the BMS master control module.

2. A lithium battery system supporting capacity expansion according to claim 1, characterized in that: The battery capacity and structure of the multiple lithium battery boxes connected to the high-voltage box are the same.

3. The lithium battery system supporting capacity expansion according to claim 1, characterized in that: The high-voltage box includes a display module, and an opening for exposing the display module is provided on the box body of the high-voltage box; the display module is connected to the BMS main control module to display the working status information of the connected lithium battery box.

4. A lithium battery system supporting capacity expansion according to claim 3, characterized in that: A control button is provided on one side of the display module, and the control button is connected to the BMS main control module and is used to activate the lithium battery box connected to the high-voltage box to display the working status information of the lithium battery box through the display module.

5. The lithium battery system supporting capacity expansion according to claim 1, characterized in that: All or part of the electrical components in the high-voltage box are electrically connected through copper bars, and the copper bars and the box body are separated by resin insulators.

6. The lithium battery system supporting capacity expansion according to claim 1, characterized in that: The high-voltage box comprises a box body with an opening at the upper end and a cover plate closing the box body opening from the upper end. The cover plate is fixed on the box body, and a waterproof adhesive strip is provided between the cover plate and the box body.

7. The lithium battery system supporting capacity expansion according to claim 1, characterized in that: A plurality of first connection brackets are arranged on the high voltage box, the bottom of the first connection brackets is flush with the bottom of the high voltage box, the first connection brackets are arranged in a U shape, and connection holes are arranged at the bottom of the first connection brackets.

8. The lithium battery system supporting capacity expansion according to claim 1, characterized in that: A second connecting bracket is provided on the lithium battery box, and the lithium battery box is fixed to the frame at the second connecting bracket through a threaded connector. The connecting interface between the second connecting bracket, the lithium battery box and the high-voltage box is arranged on the same side of the lithium battery box.

9. The lithium battery system supporting capacity expansion according to claim 1, characterized in that: The lithium battery box is provided with a handle.

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