Lithium battery pack with voltage switching function

Abstract

The utility model discloses a lithium electricity battery package with voltage switching function, lithium electricity battery package includes an outer shell, two battery groups, two battery management systems, first adapter plate and second adapter plate, be equipped with an adapter plate interface on the outer shell, the adapter plate interface with first adapter plate and second adapter plate match, the adapter plate interface includes the battery pin of battery group, two battery management systems correspondingly connect two battery groups, first adapter plate inserts the state of adapter plate interface, and two battery groups are connected the power pin of first adapter plate after series connection through first adapter plate, second adapter plate inserts the state of adapter plate interface, and two battery groups are connected the power pin of second adapter plate after parallel connection through second adapter plate, the compatibility of lithium electricity battery package can be improved in the application, makes the use cost reduction of battery package utensil, and the use of battery package utensil is convenient.

Description

Technical Field

[0001] This utility model relates to a lithium battery pack with voltage switching function. Background Technology

[0002] As power tools evolve towards higher efficiency, lighter weight, and cordless operation, lithium-ion battery packs, as the core power source, have gradually replaced traditional nickel-metal hydride and lead-acid batteries. Existing power tool lithium battery packs typically employ a series-parallel structure of 18650 or 21700 cylindrical cells, with the cell assembly fixed by metal brackets and a battery management system (BMS) used for charge and discharge control.

[0003] Most battery packs on the market currently have a fixed voltage output, but the voltage of garden tools or household tools is different. Household tools such as hand drills and chainsaws generally use 20V, while common garden tools or hair dryers mostly use 40V. If a household or company wants to use these tools, it has to use two different battery packs to adapt to the different tools, which makes it cumbersome to carry and incompatible when in use. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of poor compatibility and inconvenience of use of existing battery packs, and to provide a lithium battery pack with voltage switching function that can improve the compatibility of lithium battery packs, reduce the cost of using battery packs, and facilitate the use of battery packs.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A lithium battery pack with voltage switching function is characterized in that the lithium battery pack includes a shell, two battery packs, two battery management systems, a first adapter board, and a second adapter board.

[0007] The outer casing is provided with an adapter board interface, which is matched with a first adapter board and a second adapter board. The adapter board interface includes the battery pins of the battery pack.

[0008] Two battery management systems are connected to the two battery packs in a one-to-one correspondence;

[0009] With the first adapter board inserted into the adapter board interface, the two battery packs are connected in series through the first adapter board and then connected to the power pins of the first adapter board.

[0010] With the second adapter board inserted into the adapter board interface, the two battery packs are connected in parallel through the second adapter board and then connected to the power pins of the second adapter board.

[0011] Preferably, the first adapter board includes a first output positive terminal, a first output negative terminal, a first input positive terminal, a first input negative terminal, a second input positive terminal, and a second input negative terminal. The first output positive terminal is connected to the first input positive terminal, the first output negative terminal is connected to the second input negative terminal, and the first input negative terminal is connected to the second input positive terminal within the adapter board.

[0012] Preferably, the battery pins of the adapter board interface include a first interface positive terminal and a first interface negative terminal for the first battery pack, and a second interface positive terminal and a second interface negative terminal for the second battery pack.

[0013] With the first adapter board inserted into the adapter board interface, the positive terminal of the first interface is connected to the positive terminal of the first input, the positive terminal of the second interface is connected to the positive terminal of the second input, the negative terminal of the first interface is connected to the negative terminal of the second input, and the negative terminal of the second interface is connected to the negative terminal of the second input.

[0014] Preferably, the positive pin of the first battery management system is connected between the positive terminal of the first battery pack and the positive terminal of the first interface, the negative pin of the first battery management system is connected between the negative terminal of the first battery pack and the negative terminal of the first interface, the positive pin of the second battery management system is connected between the positive terminal of the second battery pack and the positive terminal of the second interface, and the negative pin of the second battery management system is connected between the negative terminal of the second battery pack and the negative terminal of the second interface.

[0015] Preferably, the second adapter board includes a second positive output, a second negative output, a third positive input, a third negative input, a fourth positive input, and a fourth negative input. The second positive output is connected to the third positive input, the second negative output is connected to the third negative input, the second positive output is also connected to the fourth positive input, and the second negative output is also connected to the fourth negative input.

[0016] Preferably, the battery pins of the adapter board interface include a first interface positive terminal and a first interface negative terminal for the first battery pack, and a second interface positive terminal and a second interface negative terminal for the second battery pack.

[0017] With the first adapter board inserted into the adapter board interface, the positive terminal of the first interface is connected to the positive terminal of the third input, the positive terminal of the second interface is connected to the positive terminal of the fourth input, the negative terminal of the first interface is connected to the negative terminal of the third input, and the negative terminal of the second interface is connected to the negative terminal of the fourth input.

[0018] Preferably, the positive terminal of the first interface, the positive terminal of the second interface, the negative terminal of the first interface, and the negative terminal of the second interface are arranged sequentially within the interface of the adapter board.

[0019] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0020] The positive and progressive effects of this utility model are as follows:

[0021] This application can improve the compatibility of lithium battery packs, reduce the cost of using battery pack equipment, and make the use of battery pack equipment more convenient.

[0022] To improve the compatibility of lithium battery packs, we developed a lithium battery pack that can switch between 20V and 40V. This battery pack not only meets the needs of a single battery pack to adapt to commonly used voltage tools, but also reduces electronic waste. Moreover, the cost of automatically switching battery packs is less than the combined price of 40V and 20V battery packs, saving users money on batteries. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the lithium battery pack in Embodiment 1 of this utility model.

[0024] Figure 2 This is another structural schematic diagram of the lithium battery pack of Embodiment 1 of this utility model.

[0025] Figure 3 This is another structural schematic diagram of the lithium battery pack of Embodiment 1 of this utility model. Detailed Implementation

[0026] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0027] Example 1

[0028] In this embodiment, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] See Figures 1 to 3 This embodiment provides a lithium battery pack with voltage switching function. The lithium battery pack includes a shell, two battery packs 11, two battery management systems 12, a first adapter board 13 and a second adapter board 14.

[0030] In this embodiment, with a single battery cell having a voltage of 4V, five batteries connected in series form a battery pack, and one battery pack can achieve a voltage output of 20V.

[0031] The housing is provided with an adapter board interface 15, which is matched with the first adapter board 13 and the second adapter board 14. The adapter board interface 15 includes battery pins for two battery packs 11.

[0032] The adapter plate is a detachable part. When the first adapter plate 13 is inserted into the adapter plate interface, the two battery packs can be connected in series. When the second adapter plate 14 is inserted into the adapter plate interface, the two battery packs can be connected in parallel.

[0033] Two battery management systems are connected to the two battery packs in a one-to-one correspondence.

[0034] With the first adapter board 13 inserted into the adapter board interface, the two battery packs are connected in series through the first adapter board and then connected to the power pin 131 of the first adapter board 13.

[0035] With the second adapter board 14 inserted into the adapter board interface, the two battery packs are connected in parallel through the second adapter board and then connected to the power pin 141 of the second adapter board 14.

[0036] The first adapter board 13 includes a first output positive terminal 132, a first output negative terminal 133, a first input positive terminal 134, a first input negative terminal 135, a second input positive terminal 136, and a second input negative terminal 137.

[0037] The first output positive terminal 132 is connected to the first input positive terminal 134, the first output negative terminal 133 is connected to the second input negative terminal 137, and the first input negative terminal 135 is connected to the second input positive terminal 136 inside the adapter plate.

[0038] The first output positive and the first output negative are the power supply pins.

[0039] The battery pins of the adapter board interface 15 include the first interface positive terminal 151 and the first interface negative terminal 152 of the first battery pack 111, and the second interface positive terminal 153 and the second interface negative terminal 154 of the second battery pack 112.

[0040] With the first adapter board inserted into the adapter board interface, the positive terminal of the first interface is connected to the positive terminal of the first input, the positive terminal of the second interface is connected to the positive terminal of the second input, the negative terminal of the first interface is connected to the negative terminal of the second input, and the negative terminal of the second interface is connected to the negative terminal of the second input.

[0041] The positive pin of the first battery management system is connected between the positive terminal of the first battery pack and the positive terminal of the first interface. The negative pin of the first battery management system is connected between the negative terminal of the first battery pack and the negative terminal of the first interface. The positive pin of the second battery management system is connected between the positive terminal of the second battery pack and the positive terminal of the second interface. The negative pin of the second battery management system is connected between the negative terminal of the second battery pack and the negative terminal of the second interface.

[0042] The second adapter board 14 includes a second output positive terminal 141, a second output negative terminal 142, a third input positive terminal 143, a third input negative terminal 144, a fourth input positive terminal 145, and a fourth input negative terminal 146.

[0043] The second output positive terminal 141 is connected to the third input positive terminal 143, the second output negative terminal 142 is connected to the third input negative terminal 144, the second output positive terminal 141 is also connected to the fourth input positive terminal 145, and the second output negative terminal 142 is also connected to the fourth input negative terminal 146.

[0044] The battery pins of the adapter board interface 15 include the first interface positive terminal 151 and the first interface negative terminal 152 of the first battery pack 111, and the second interface positive terminal 153 and the second interface negative terminal 154 of the second battery pack 112.

[0045] With the first adapter board inserted into the adapter board interface, the positive terminal 151 of the first interface is connected to the positive terminal 143 of the third input, the positive terminal 153 of the second interface is connected to the positive terminal 145 of the fourth input, the negative terminal 152 of the first interface is connected to the negative terminal 144 of the third input, and the negative terminal 154 of the second interface is connected to the negative terminal 146 of the fourth input.

[0046] The positive terminal of the first interface, the positive terminal of the second interface, the negative terminal of the first interface, and the negative terminal of the second interface are arranged sequentially within the interface of the adapter board.

[0047] The Battery Management System (BMS) of a battery pack, acting as the circuit system for controlling and protecting battery charging and discharging, determines the output voltage based on the number of batteries connected in series or parallel. The principle of a self-switching battery pack is as follows: With a single battery cell producing 4V, connecting five batteries in series achieves a 20V output. However, connecting batteries in parallel only increases battery capacity, not the output voltage. Therefore, utilizing this principle, five nickel-plated batteries are connected in series to form a 20V battery pack, with two packs prepared. When a 20V output is needed, these two packs are connected in parallel to achieve 20V. When a 40V output is required, the two 20V battery packs are connected in series, with the positive terminal of the lower-end pack connected to the negative terminal of the higher-end pack. The output is achieved by connecting the negative terminal of the lower-end pack to the positive terminal of the higher-end pack.

[0048] Based on the above principles, the overall architecture is as follows: Figure 2As shown, two independent BMS systems are designed, equivalent to two 20V battery packs, with two external adapter boards. The battery packs lead out the outputs of the two battery packs separately. When a 20V output is needed, the high-voltage terminals of the two battery packs are connected together via the 20V adapter board, and the low-voltage terminals are connected together via the adapter board, achieving parallel output of the two battery packs. When a 40V output is needed, the positive terminal of the low-voltage battery and the negative terminal of the high-voltage battery are connected together via the adapter board, achieving series 40V.

[0049] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A lithium battery pack with voltage switching function, characterized in that, The lithium battery pack includes a casing, two battery packs, two battery management systems, a first adapter board, and a second adapter board. The outer casing is provided with an adapter board interface, which is matched with a first adapter board and a second adapter board. The adapter board interface includes the battery pins of the battery pack. Two battery management systems are connected to the two battery packs in a one-to-one correspondence; With the first adapter board inserted into the adapter board interface, the two battery packs are connected in series through the first adapter board and then connected to the power pins of the first adapter board. With the second adapter board inserted into the adapter board interface, the two battery packs are connected in parallel through the second adapter board and then connected to the power pins of the second adapter board.

2. The lithium battery pack with voltage switching function as described in claim 1, characterized in that, The first adapter board includes a first positive output, a first negative output, a first positive input, a first negative input, a second positive input, and a second negative input. The first positive output is connected to the first positive input, the first negative output is connected to the second negative input, and the first negative input is connected to the second positive input within the adapter board.

3. The lithium battery pack with voltage switching function as described in claim 2, characterized in that, The battery pins of the adapter board interface include the first interface positive and first interface negative terminals of the first battery pack, and the second interface positive and second interface negative terminals of the second battery pack. With the first adapter board inserted into the adapter board interface, the positive terminal of the first interface is connected to the positive terminal of the first input, the positive terminal of the second interface is connected to the positive terminal of the second input, the negative terminal of the first interface is connected to the negative terminal of the second input, and the negative terminal of the second interface is connected to the negative terminal of the second input.

4. The lithium battery pack with voltage switching function as described in claim 2, characterized in that, The positive pin of the first battery management system is connected between the positive terminal of the first battery pack and the positive terminal of the first interface. The negative pin of the first battery management system is connected between the negative terminal of the first battery pack and the negative terminal of the first interface. The positive pin of the second battery management system is connected between the positive terminal of the second battery pack and the positive terminal of the second interface. The negative pin of the second battery management system is connected between the negative terminal of the second battery pack and the negative terminal of the second interface.

5. The lithium battery pack with voltage switching function as described in claim 1, characterized in that, The second adapter board includes a second positive output, a second negative output, a third positive input, a third negative input, a fourth positive input, and a fourth negative input. The second positive output is connected to the third positive input, the second negative output is connected to the third negative input, the second positive output is also connected to the fourth positive input, and the second negative output is also connected to the fourth negative input.

6. The lithium battery pack with voltage switching function as described in claim 5, characterized in that, The battery pins of the adapter board interface include the first interface positive and first interface negative terminals of the first battery pack, and the second interface positive and second interface negative terminals of the second battery pack. With the first adapter board inserted into the adapter board interface, the positive terminal of the first interface is connected to the positive terminal of the third input, the positive terminal of the second interface is connected to the positive terminal of the fourth input, the negative terminal of the first interface is connected to the negative terminal of the third input, and the negative terminal of the second interface is connected to the negative terminal of the fourth input.

7. The lithium battery pack with voltage switching function as described in claim 3 or 6, characterized in that, The positive terminal of the first interface, the positive terminal of the second interface, the negative terminal of the first interface, and the negative terminal of the second interface are arranged sequentially within the interface of the adapter board.

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