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Low-voltage protection circuit for lithium battery

by:dcfpower     2021-02-22
Technical Field [00011 This utility model relates to a low-voltage protection circuit for lithium batteries. BACKGROUND OF THE INVENTION [0002] Lithium batteries are a type of batteries that use physical metals or lithium alloys as negative electrode materials and use non-aqueous electrolyte solutions. Due to the chemical characteristics of lithium-ion batteries, during normal use, the internal chemical positive reaction of the mutual conversion of electrical energy and chemical energy, but under certain conditions, such as over-discharge will cause chemical side reactions inside the battery. After the side reaction is intensified, it will seriously damage the battery and affect its performance and service life. Therefore, it is necessary to design low-voltage protection for lithium batteries. Utility model content [0003] In view of the above-mentioned technical deficiencies, the utility model provides a low-voltage protection circuit for lithium batteries, which can prevent over-discharge of lithium batteries and protect them when their voltage is low. [0004] In order to achieve the above purpose, the technical solutions adopted by the present utility model are as follows: [0005] A lithium battery pack low-voltage protection circuit, including a battery BT, a capacitor Cl, a capacitor C2, a capacitor C3, a metal oxide half field effect transistor V1, Metal Oxide Half Field Effect Transistor V2, Diode Dl, Diode D2, and a control IC of model R5421, where: [0006] Capacitor Cl is connected to battery BT, and control IC pin VDD is connected between cl and battery BT; [0007] Capacitor One end of C2 is connected to the battery BT, and the other end is connected to the control TC pin V-; [0008] One end of the capacitor C3 is connected to the battery BT, and the other end is connected to the control TC pin ct; [0009] The MOSFET v1 is also connected to the battery BT, Control TC pin Do and MOSFET V2 [0010] MOSFET V2 is connected to control IC pin Co; [0011] Diode D1 is connected in parallel with MOSFET V1; [0012] Diode D2 It is connected in parallel with the metal oxide half field effect transistor V2; [0013] The control IC pin VSS is connected to the battery BT. [0014] As an option, the models of the metal oxide half field effect transistor V1 and V2 are SI99260 [0015] Further, The utility model also includes a resistor Rlo with one end connected to the battery BT and the other end connected to the capacitor Cl. [0016] Further, the present invention also includes a resistor R2 connected to the control IC pin v- at one end and the battery BT at the other end. [0017 ] Furthermore, the present utility model also includes a fuse FUSE connected to the battery BT. [0018] Compared with the prior art, the utility model has the following beneficial effects: [0019] The utility model provides a low-voltage lithium battery pack The voltage protection circuit can effectively protect the lithium battery pack during the over-discharge process to ensure that the lithium battery is not damaged due to low voltage, thereby extending its service life. u003c/pu003e
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