High-voltage lithium battery system with small size and high voltage

Abstract

The invention discloses a high-voltage lithium battery system with small size and high voltage. The high-voltage lithium battery system comprises a lithium battery pack, a battery management system and a DCDC boosting module, wherein the lithium battery pack is formed by connecting a plurality of single cells in series; each single cell is connected with the battery management system through a single voltage acquisition wire harness so as to acquire the single voltage of each single cell; and the battery management system is connected with the DCDC boosting module through the low-voltage output wire harness, and is used for inputting the acquired monomer voltage into the DCDC boosting module, and the acquired monomer voltage is converted into high voltage by the DCDC boosting module. According to the system, high-voltage output of the lithium battery pack is achieved by adding the DCDC boosting module, the size is reduced by times under the same high-voltage condition, and the system adapts to the installation environment with small space and high voltage requirements.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and more particularly to a high-voltage lithium battery system with small size and high voltage. Background Art

[0002] At present, with the vigorous development of the new energy industry, the demand for lithium batteries continues to rise, especially the demand for lithium batteries of different models and voltages. High-voltage lithium batteries are favored because of their unique advantages. Figure 1 The three-view image of a lithium battery cell shows that the thickness of the cell is 70.4±0.5nm, the width is 148.7±0.5nm, the height (including the terminal) is 116.1±0.5nm, and the height (excluding the terminal) is 113.7±0.5nm. The battery cell is a power-type square lithium-ion cell with a nominal capacity (0.33C / 1C) of 142 / 139Ah, a nominal voltage (0.33C / 1C) of 3.22 / 3.17V, and a weight of 2580±30g.

[0003] Figure 2 The figure shows the existing high-voltage lithium battery system. As can be seen from the figure, the existing high-voltage technical solution adopts the method of voltage accumulation of monomers in series, that is, V 总压 =V 单体 ×N, N is the number of cells in series. Example: The total voltage requirement of lithium battery is 272V. Figure 1 The single voltage of the lithium iron phosphate cell is V = 3.2V, so 85 cells need to be connected in series. The total volume of the cells required is about 0.1m 3 , the weight of the battery cell is 85×2.58KG=219.3KG. It can be seen that due to the increase in the number of batteries connected in series, the volume and weight are too large, making it difficult to adapt to the needs of certain special working environments. Therefore, the market urgently needs a lithium battery system solution that can provide high-voltage output while maintaining a small size to overcome the limitations of existing technologies.

[0004] Therefore, how to reduce the volume and weight of the lithium battery system while maintaining the high voltage of the lithium battery is a problem that technical personnel in this field need to solve urgently. Summary of the invention

[0005] In view of the above problems, the present invention provides a high-voltage lithium battery system with small size and high voltage to at least solve some of the technical problems mentioned in the above background technology.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] The present invention provides a high-voltage lithium battery system with small volume and high voltage, comprising: a lithium battery pack, a battery management system and a DCDC boost module;

[0008] The lithium battery pack is composed of a plurality of single cells connected in series; each of the single cells is connected to the battery management system through a single cell voltage collection harness to collect the single cell voltage of each single cell;

[0009] The battery management system is connected to the DCDC boost module via a low-voltage output harness, and is used to input the collected single cell voltage into the DCDC boost module, which converts it into high voltage.

[0010] Furthermore, the DCDC boost module converts the voltage into high voltage, which is specifically expressed as:

[0011] V 总压 =V 单体 ×M×f DCDC模块升压倍率

[0012] Among them, V 总压 Represents the high voltage converted by the DCDC boost module; V 单体 represents the cell voltage of the single cell collected by the battery management system; M represents the number of single cells; f DCDC模块升压倍率 Indicates the conversion ratio of the DCDC boost module from low voltage to high voltage.

[0013] Furthermore, the input voltage range of the DCDC boost module is 16V-40V; the output voltage is 270V.

[0014] Furthermore, each of the single cells is also connected to the battery management system via a power line to collect and control the battery current of the single cell.

[0015] Furthermore, the battery management system is also connected to the DCDC boost module via an enable drive line to control the working state of the DCDC boost module.

[0016] It can be seen from the above technical solution that, compared with the prior art, the present invention discloses a high-voltage lithium battery system with small volume and high voltage, which has the following beneficial effects: the present invention realizes the high-voltage output of the lithium battery pack by adding a DCDC boost module, thereby achieving a multiple reduction in volume under the same high voltage condition, and adapting to the installation environment with small space and high voltage requirements.

[0017] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 A three-view schematic diagram of a lithium battery cell provided by the relevant prior art.

[0021] Figure 2 A schematic diagram of the high-voltage lithium battery system structure provided for related prior art.

[0022] Figure 3 A schematic diagram of the structure of a high-voltage lithium battery system with a small size and high voltage provided by an embodiment of the present invention.

[0023] Figure 4 A schematic top view of a DCDC boost module provided in an embodiment of the present invention.

[0024] Figure 5 A schematic front view of a DCDC boost module provided in an embodiment of the present invention.

[0025] Among them: 1-single cell; 2-battery management system; 3-lithium battery pack; 4-DCDC boost module. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The embodiment of the present invention discloses a high-voltage lithium battery system with a small volume and high voltage, comprising: a lithium battery pack 3, a battery management system 2 and a DCDC boost module 4; wherein: the lithium battery pack 3 is composed of a plurality of single cells 1 connected in series; each single cell 1 is connected to the battery management system 2 through a single cell voltage collection harness to collect the single cell voltage of each single cell 2; the battery management system 2 is connected to the DCDC boost module 4 through a low-voltage output harness to input the collected single cell voltage into the DCDC boost module 4, and the DCDC boost module 4 converts the single cell voltage into high voltage;

[0028] The above is converted into high voltage by the DCDC boost module 4, which is specifically expressed as:

[0029] V 总压 =V单体 ×M×f DCDC模块升压倍率

[0030] Among them, V 总压 Represents the high voltage converted by the DCDC boost module; V 单体 represents the cell voltage of the single cell collected by the battery management system; M represents the number of single cells; f DCDC模块升压倍率 Indicates the conversion rate of the DCDC boost module from low voltage to high voltage; the f DCDC模块升压倍率 Provided by the characteristics of the DCDC boost module;

[0031] The invention aims to achieve high voltage output of lithium batteries by adopting a voltage conversion method, thereby simultaneously meeting the system requirements of small size and high voltage. Figure 3 As shown in the figure, the battery management system 2 obtains the single cell voltage of each single cell 1, that is, collects the positive voltage output signal B+ and the negative voltage output signal B- of the lithium battery pack; and inputs the positive voltage output signal B+ and the negative voltage output signal B- to the positive low voltage input terminal P1+ and the negative low voltage input terminal P1- of the DCDC boost module, converts them into the required high voltage through the boost characteristics of the DCDC module, and outputs them through the power high voltage positive output terminal P+ and the power high voltage negative output terminal P-.

[0032] For example, the total voltage of lithium battery needs to be 270V. Figure 1 The single voltage of the lithium iron phosphate battery cell shown is V = 3.18V. Figure 3 The FG1A28 series DCDC module shown in the figure has a boost ratio of 10. This requires 9 cells to be connected in series. The total volume of the cells required is about 0.01m 3 The total volume of the DCDC boost module is 51.03cm 3 The weight of the battery cell is 9×2.58KG=23.22KG, and the output voltage V=270V. This achieves a significant reduction in the volume and weight of the high-voltage lithium battery system while maintaining high voltage.

[0033] The top view and front view of the above DCDC boost module can be seen in Figure 4 and Figure 5 As shown, its input voltage range is 16V-40V; the output voltage is 270V; the efficiency is up to 93.5%; it not only has excellent thermal performance, but also is equipped with overvoltage, overcurrent, short circuit and overtemperature protection.

[0034] In another embodiment, each single battery cell 1 is also connected to the battery management system 2 via a power line to collect and control the battery current of the single battery cell 1 .

[0035] In another embodiment, the battery management system 2 is also connected to the DCDC boost module 4 through an enable drive line, and is used to realize output control of the DCDC boost module through the high and low levels of the enable signal. The DCDC boost module detects the high / low levels to realize the on / off of the high voltage output, thereby realizing the controllability of the output.

[0036] In another embodiment, a charging power supply is also included for charging the lithium battery through the positive low voltage input terminal P1+ and the negative low voltage input terminal P1- of the DCDC boost module. Low voltage charging during use ensures that the charging voltage is within the safe voltage range for the human body, and does not require a high voltage charging solution. The charging solution of the invention is not only safe, but also highly compatible with existing chargers on the market.

[0037] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0038] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-voltage lithium battery system with a small volume and high voltage, characterized in that: include: Lithium battery pack, battery management system and DCDC boost module; The lithium battery pack is composed of a plurality of single cells connected in series; each of the single cells is connected to the battery management system through a single cell voltage collection harness to collect the single cell voltage of each single cell; The battery management system is connected to the DCDC boost module via a low-voltage output harness, and is used to input the collected single cell voltage into the DCDC boost module, which converts it into high voltage.

2. The high-voltage lithium battery system with small volume and high voltage according to claim 1, characterized in that: The DCDC boost module converts it into high voltage, which is specifically expressed as: V 总压 =V 单体 ×M×f DCDC模块升压倍率 Among them, V 总压 Represents the high voltage converted by the DCDC boost module; V 单体 represents the cell voltage of the single cell collected by the battery management system; M represents the number of single cells; f DCDC模块升压倍率 Indicates the conversion ratio of the DCDC boost module from low voltage to high voltage.

3. The high-voltage lithium battery system with small volume and high voltage according to claim 1, characterized in that: The input voltage range of the DCDC boost module is 16V-40V; the output voltage is 270V.

4. The high-voltage lithium battery system with small volume and high voltage according to claim 1, characterized in that: Each of the single cells is also connected to the battery management system via a power line to collect and control the battery current of the single cell.

5. The high-voltage lithium battery system with small volume and high voltage according to claim 1, characterized in that: The battery management system is also connected to the DCDC boost module via an enable drive line to control the working state of the DCDC boost module.

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