Battery pack

Abstract

The utility model relates to the field of energy storage equipment, and particularly discloses a battery pack, which comprises a battery pack shell, a battery module arranged in the battery pack shell, a circuit board electrically connected with the battery module, and a terminal connecting seat arranged in the battery pack shell, a positive electrode of the battery module is connected with a first power connection piece, a negative electrode of the battery module is connected with a second power connection piece, the first power connection piece is electrically connected with a positive negative terminal, the second power connection piece is electrically connected with a negative negative terminal, and a fuse is installed on a connection path of the first power connection piece and the positive negative terminal or a connection path of the second power connection piece and the negative negative terminal. Load current provided by the battery module flows to the electric tool through the first power connection piece, the fuse and the positive negative terminal and then flows back to the negative negative terminal and the second power connection piece, the influence of heat generated by the load current on the circuit board is small, and the heat productivity of the circuit board is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy storage devices, in particular to a battery pack. BACKGROUND

[0002] In the rich use scenarios of power tools, the performance and convenience of the battery pack as the core power supply component directly affect the overall performance of the power tool. Generally, the battery pack needs to be cooperated with the power tool. The internal structure of the battery pack is precise, and is equipped with a battery module, a female terminal and a circuit board. Among them, the circuit board is electrically connected with the battery module in the battery pack, and undertakes the task of regulating and managing the output current of the battery module; the female terminal is electrically connected with the circuit board, and plays the role of current output interface. When the battery pack is assembled with the power tool, the male terminal on the power tool will be precisely inserted with the female terminal of the battery pack, thereby building a complete current transmission path, so that the current provided by the battery module can be smoothly transmitted to the power tool via the circuit board and the female terminal, to drive the operation of the power tool. However, when the power tool is in a load working state, a large intensity of load current will pass through the circuit board. Since the circuit board itself has a certain resistance, the continuous flow of large load current will cause the circuit board to heat. Moreover, the heat of the circuit board will gradually conduct to other components of the battery pack, thereby causing the battery pack to heat seriously as a whole. This not only affects the service life of the battery pack, but also may trigger the safety protection mechanism due to overheating, reduce the working efficiency and stability of the power tool, and bring many inconveniences to the user. CONTENT OF THE UTILITY MODEL

[0003] The utility model at least one specific implementation mode is to solve the defects existing in prior art, provide a kind of battery pack.

[0004] To achieve the above object, the technical scheme adopted by the utility model is as follows:

[0005] A battery pack, comprising:

[0006] A battery pack shell;

[0007] A battery module is installed in the battery pack shell;

[0008] A circuit board is installed in the battery pack shell and is electrically connected with the battery module;

[0009] A terminal connecting seat is installed in the battery pack shell, and a positive female terminal and a negative female terminal are installed on the terminal connecting seat;

[0010] The positive electrode of the battery module is connected with a first electric contact piece, and the negative electrode of the battery module is connected with a second electric contact piece;

[0011] The first electric contact piece is electrically connected with the positive female terminal, and the second electric contact piece is electrically connected with the negative female terminal;

[0012] The complete connection path between the positive electrode, the first current collector tab, and the positive female terminal of the battery module does not contact the circuit board; and / or

[0013] The complete connection path between the negative electrode, the second current collector tab, and the negative female terminal of the battery module does not contact the circuit board.

[0014] Further, a fuse is installed on the connection path between the first current collector tab and the positive female terminal or the connection path between the second current collector tab and the negative female terminal, one end of the fuse is electrically and mechanically connected to the positive female terminal or the negative female terminal, and the other end of the fuse is electrically and mechanically connected to the first current collector tab or the second current collector tab.

[0015] Further, the fuse is located above the circuit board along the entire path between the two ends in the length direction.

[0016] Further, the connection point of the fuse on the positive female terminal or the negative female terminal is located above the circuit board and has a gap between the circuit board.

[0017] Further, the connection point of the fuse on the first current collector tab or the second current collector tab is located above the circuit board and has a gap between the circuit board.

[0018] Further, the positive female terminal and the negative female terminal include a base and a leg, the leg is connected to the circuit board, the first current collector tab is electrically connected to the base of the positive female terminal, and the second current collector tab is electrically connected to the base of the negative female terminal.

[0019] Further, the battery module includes a plurality of cell units, and the plurality of cell units are connected in parallel or in series to form the battery module.

[0020] Further, a signal female terminal is also installed on the terminal connecting seat and is electrically connected to the circuit board.

[0021] Further, the first current collector tab and / or the second current collector tab have an extension and a lifting portion, the extension is adapted to extend to both sides of the battery module to connect the positive and negative electrodes of the battery module, and the lifting portion is adapted to adjust the height of the end portion of the first current collector tab and the second current collector tab according to the height of the circuit board, so that the end portion of the first current collector tab and the second current collector tab extends to the space above the circuit board.

[0022] Further, the extension is located above or below the circuit board as a whole and has a gap between the circuit board.

[0023] The beneficial effects of the present application are: the positive electrode of the battery module of the battery pack is connected with the first connecting tab, the negative electrode of the battery module is connected with the second connecting tab, the first connecting tab is electrically connected with the positive electrode negative terminal, the second connecting tab is electrically connected with the negative electrode negative terminal, a fuse is installed on the connection path of the first connecting tab and the positive electrode negative terminal or the connection path of the second connecting tab and the negative electrode negative terminal, after the battery pack is assembled with the electric tool, when the electric tool is turned on, the load current provided by the battery module flows to the electric tool through the first connecting tab, the fuse and the positive electrode negative terminal, and then flows back to the negative electrode negative terminal and the second connecting tab, the heat generated by the load current has little effect on the circuit board; the circuit board works in a lower temperature environment, which can effectively reduce the problems such as performance degradation of electronic components, loose solder joints and the like caused by overheating, and improve the stability and reliability of the circuit board; by reducing the heat of the circuit board, the damage of high temperature to various components on the circuit board is reduced, thereby prolonging the service life of the circuit board, reducing the probability of damage of the battery pack due to circuit board failure, and improving the durability of the entire battery pack.

[0024] When an abnormal condition such as overload or short circuit occurs in the circuit, the current will increase sharply, and the fuse will be melted in a short time to cut off the circuit, preventing excessive current from causing damage to the battery module, the electric tool and other circuit components, avoiding safety accidents such as fire, and ensuring safety during use. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0026] Figure 1 It is a structural schematic diagram of the battery pack in some embodiments of the present application.

[0027] Figure 2 It is a structural schematic diagram of the battery pack in some embodiments of the present application.

[0028] Figure 3 It is a structural schematic diagram of the battery pack in some embodiments of the present application. Figure 2

[0029] Figure 4 It is a structural schematic diagram of the battery pack in some embodiments of the present application. DETAILED DESCRIPTION

[0030] ​The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] Reference Figure 1 , Figure 2 , Figure 3 A battery pack 100 includes a battery pack housing 10, a battery module 20 disposed within the battery pack housing 10, a circuit board 30 installed within the battery pack housing 10 and electrically connected to the battery module 20, and a terminal connector 40 installed within the battery pack housing 10. The terminal connector 40 is provided with a positive cathode terminal 401, a negative cathode terminal 402, and a signal cathode terminal 403, and the signal cathode terminal 403 is electrically connected to the circuit board 30.

[0032] Among them, the battery pack housing 10 serves as the external protective structure of the entire battery pack 100, providing a stable installation space and protective barrier for the internal components, effectively preventing external dust, moisture and other impurities from entering, and ensuring the normal working environment of the internal components of the battery pack 100.

[0033] The circuit board 30 plays an important control and management role in the battery pack 100. For example, it monitors and regulates the charging and discharging process of the battery module 20, protects the battery module 20 from abnormal conditions such as overcharging, over-discharging, and short circuit, and can also realize signal transmission and communication with power tools.

[0034] The positive terminal of the battery module 20 is connected to the first contact plate 201, and the negative terminal of the battery module 20 is connected to the second contact plate 202.

[0035] In this embodiment, the first contact piece 201 is electrically connected to the positive cathode terminal 401, and the second contact piece 202 is electrically connected to the negative cathode terminal 402.

[0036] The complete connection path between the positive terminal, the first contact piece 201, and the positive terminal 401 of the battery module 20 does not contact the circuit board 30; and / or the complete connection path between the negative terminal, the second contact piece 202, and the negative terminal 402 of the battery module 20 does not contact the circuit board 30. Preferably, the first contact piece 201 and the second contact piece 202 do not make electrical or mechanical contact with the circuit board 30.

[0037] Further, in order to improve safety, a fuse 50 is installed on the connection path of the first power tab 201 and the positive female terminal 401 or the connection path of the second power tab 202 and the negative female terminal 402, one end of the fuse 50 is electrically and mechanically connected with the positive female terminal 401 or the negative female terminal 402, the other end of the fuse 50 is electrically and mechanically connected with the first power tab 201 or the second power tab 202, the fuse 50 as an important safety protection element can timely cut off the circuit when abnormal conditions such as overload or short circuit occur in the circuit, preventing excessive current from causing damage to the battery module 20, the circuit board 30 and the power tool.

[0038] Further, the positive female terminal 401 and the negative female terminal 402 have similar structures, and the positive female terminal 401 and the negative female terminal 402 include a base 40a and a leg 40b, it should be noted that the leg 40b is only mechanically connected with the circuit board 30 without conducting electricity, the first power tab 201 is electrically connected with the base 40b of the positive female terminal 401, and the second power tab 202 is electrically connected with the base 40b of the negative female terminal 402.

[0039] Further, the battery module 20 includes a plurality of cell units 20a, and the plurality of cell units 20a are connected in parallel or in series to form the battery module 20, and the battery module 20 is composed of a plurality of cell units 20a, and the cell units 20a can be connected in parallel or in series according to actual voltage and capacity requirements. When the plurality of cell units 20a are connected in parallel, the capacity of the battery module 20 increases accordingly, while the voltage remains unchanged; when the plurality of cell units 20a are connected in series, the voltage of the battery module 20 increases, while the capacity remains unchanged. By reasonably selecting the parallel or series connection mode, the requirements of different power tools for power voltage and capacity can be met.

[0040] The battery pack 100 of the present application is mainly used to supply power to the power tool, and after the battery pack 100 is assembled with the power tool, the current male terminal of the power tool is inserted with the positive female terminal 401 and the negative female terminal 402, and the signal male terminal of the power tool is inserted with the signal female terminal 403.

[0041] Further, after the battery pack 100 is assembled with the power tool, when the power tool is turned on, the load current provided by the battery module 20 flows through the first power tab 201, the fuse 50, the positive female terminal 401 to the power tool, and then flows back to the negative female terminal 402 and the second power tab 202. It is worth noting that the flow path of the load current does not pass through the circuit board 30, and the flow path of the load current does not pass through the circuit board 30. This design avoids the influence of large load current on the circuit board 30, reduces the heating phenomenon of the circuit board 30, improves the stability and reliability of the circuit board 30, and also prolongs the service life of the circuit board 30.

[0042] After the battery pack 100 is assembled with the power tool, the battery module 20 provides a signal current to the circuit board 30, the signal current flows to the power tool through the circuit board 30, the signal negative terminal 403, and then flows back to the circuit board 30 through another signal negative terminal 403, wherein the intensity of the load current is much greater than that of the signal current, and the transmission paths of the load current and the signal current are designed separately in the application, the load current does not pass through the circuit board 30, which can avoid the heating of the circuit board 30, and the signal current itself has a small intensity, although the signal current passes through the circuit board 30, it will not have a great impact on the heating of the circuit board 30.

[0043] In some embodiments, the leg 40b of the end of the positive negative terminal 401 or the negative negative terminal 402 is provided with a pressing portion 40c on both sides, in the present embodiment, the pressing portion 40c is installed at the end of the positive negative terminal 401, after the positive negative terminal 401 is connected with the circuit board 30 through the leg 40b, the pressing portion 40c is tightly fixed on the surface of the fuse 50, and the fuse 50 can be stably electrically and mechanically connected with the positive negative terminal 401, which not only ensures that the fuse 50 can be stably electrically connected with the positive negative terminal 401, but also ensures the mechanical connection stability between them, preventing the fuse 50 from loosening or poor contact due to vibration and other factors during use of the battery pack 100.

[0044] In addition, with reference to Figure 4 In some embodiments, the entire path between the two ends of the fuse 50 in the length direction is located above the circuit board 30, the connection point of the positive negative terminal 401 or the negative negative terminal 402 with the fuse 50 is located above the circuit board 30 and there is a gap between the circuit board 30, and the connection point of the first electrical contact piece 201 or the second electrical contact piece 202 with the fuse 50 is located above the circuit board 30 and there is a gap between the circuit board 30, and the structure improvement is mainly to avoid the direct connection or contact of the fuse 50 with the circuit board 30.

[0045] For the above design, the specific structure is as follows, the first electrical contact piece 201 and / or the second electrical contact piece 202 is provided with an extension portion and a lifting portion, taking the structure of the first electrical contact piece 201 as an example, the first electrical contact piece 201 is provided with an extension portion 201a and a lifting portion 201b, the extension portion 201a can extend to both sides of the battery module 20 to connect the positive and negative electrodes of the battery module 20, and the lifting portion 201b can adjust the height of the end of the first electrical contact piece 201 according to the height of the circuit board 30, so that the end of the first electrical contact piece 201 extends to the space above the circuit board 30.

[0046] In some embodiments, the extension 201a is located above or below the circuit board 30 as a whole, and there is a gap between the extension 201a and the circuit board 30, mainly to ensure that there is a gap between the first and / or second electrical connection pieces 201 and 202 and the circuit board 30, and at the same time, there is a gap between the fuse 50 mounted on the first and / or second electrical connection pieces 201 and 202 and the circuit board 30.

[0047] In summary, the positive electrode of the battery module 20 of the battery pack 100 is connected to the first electrical connection piece 201, the negative electrode of the battery module 20 is connected to the second electrical connection piece 202, the first electrical connection piece 201 is electrically connected to the positive electrode negative terminal 401, the second electrical connection piece 202 is electrically connected to the negative electrode negative terminal 402, and the fuse 50 is mounted on the connection path of the first electrical connection piece 201 and the positive electrode negative terminal 401 or the connection path of the second electrical connection piece 202 and the negative electrode negative terminal 402. After the battery pack 100 is assembled with the electric tool, when the electric tool is turned on, the load current provided by the battery module 20 flows to the electric tool through the first electrical connection piece 201, the fuse 50, and the positive electrode negative terminal 401, and then flows back to the negative electrode negative terminal 402 and the second electrical connection piece 202. The flow path of the load current does not pass through the circuit board 30, and the heat generated by the load current has little effect on the circuit board 30, greatly reducing the heat generation of the circuit board 30. The circuit board 30 works in a lower temperature environment, which can effectively reduce the problems of performance degradation of electronic components, loose solder joints, and the like caused by overheating, and improve the stability and reliability of the circuit board 30. By reducing the heat generation of the circuit board 30, the damage of high temperature to various components on the circuit board 30 is reduced, thereby prolonging the service life of the circuit board 30, reducing the probability of damage of the battery pack due to circuit board failure, and improving the durability of the entire battery pack.

[0048] When an abnormal condition such as overload or short circuit occurs in the circuit, the current will increase sharply, and the fuse 50 will be blown in a short time to cut off the circuit, preventing excessive current from causing damage to the battery module 20, the electric tool, and other circuit components, and avoiding the occurrence of safety accidents such as fire, thereby ensuring safety during use.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, comprising: a battery pack housing; a battery module installed in the battery pack housing; a circuit board installed in the battery pack housing and electrically connected to the battery module; a terminal connector installed in the battery pack housing, the terminal connector having a positive female terminal and a negative female terminal installed thereon; characterized in that a positive terminal of the battery module is connected to a first busbar, and a negative terminal of the battery module is connected to a second busbar; the first busbar is electrically connected to the positive female terminal, and the second busbar is electrically connected to the negative female terminal; a complete connection path between the positive terminal of the battery module, the first busbar, and the positive female terminal does not contact the circuit board; and / or a complete connection path between the negative terminal of the battery module, the second busbar, and the negative female terminal does not contact the circuit board.

2. The battery pack of claim 1, wherein, a fuse is installed on a connection path between the first busbar and the positive female terminal or between the second busbar and the negative female terminal, one end of the fuse is electrically and mechanically connected to the positive female terminal or the negative female terminal, and the other end of the fuse is electrically and mechanically connected to the first busbar or the second busbar.

3. The battery pack of claim 2, wherein, The fuse is located above the circuit board along the entire path between the two ends in the length direction.

4. The battery pack of claim 2, wherein, The connection point of the fuse on the positive female terminal or the negative female terminal is located above the circuit board and has a gap between the circuit board.

5. The battery pack of claim 2, wherein, The connection point of the fuse on the first busbar or the second busbar is located above the circuit board and has a gap between the circuit board.

6. The battery pack of claim 1, wherein, The positive female terminal and the negative female terminal include a base and a leg, the leg is connected to the circuit board, the first busbar is electrically connected to the base of the positive female terminal, and the second busbar is electrically connected to the base of the negative female terminal.

7. The battery pack of claim 1, wherein, The battery module includes a plurality of cell units, and the plurality of cell units are connected in parallel or in series to form the battery module.

8. The battery pack of claim 1, wherein, The terminal connector further has a signal female terminal installed thereon, and the signal female terminal is electrically connected to the circuit board.

9. The battery pack of claim 1, wherein, The first busbar and / or the second busbar have an extension and a lifting portion, the extension is adapted to extend to both sides of the battery module to connect the positive and negative terminals of the battery module, and the lifting portion is adapted to adjust the height of the end of the first busbar and / or the second busbar according to the height of the circuit board, so that the end of the first busbar and / or the second busbar extends above the space of the circuit board.

10. The battery pack of claim 9, wherein, The extension is located above or below the circuit board and has a gap between the circuit board.

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