Auxiliary discharging method for lithium battery pack

Abstract

The invention discloses an auxiliary discharging method for a lithium battery pack in the technical field of lithium batteries. A lithium battery stack, a protection plate, a supercapacitor and a discharging / charging socket are included. The lithium battery stack, the protection plate, the super capacitor and the discharging / charging socket are electrically connected to form a discharging loop, and the discharging capacity of the lithium battery pack is improved through the rapid charging and rapid discharging characteristics of the super capacitor, so that the working voltage of the lithium battery pack is within a specific range, and the auxiliary discharging effect is achieved. According to the scheme, the problem that the discharge performance of the lithium battery cannot meet the working condition under the condition that the working voltage has strict requirements is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a lithium battery pack auxiliary discharge method. Background Art

[0002] Lithium battery is a high-performance rechargeable battery. It is widely used in various fields due to its high energy density, fast charging, long life, lightness, convenience, safety, and low cost. However, due to the limitations of existing technology, it is difficult to significantly improve the specific power of lithium battery cells. In constant power discharge, large pulse currents are superimposed. At the same time, the characteristics of constant power discharge are very obvious. The current increases with time. At the end of discharge, the capacity decreases and the current increases, which is a great test of the battery's discharge performance. However, under the condition of strict requirements on the working voltage, the existing lithium battery technology is difficult to meet the above working conditions. Therefore, there is an urgent need for a discharge method to assist lithium battery discharge and ensure discharge performance. Summary of the invention

[0003] The present invention is intended to provide a lithium battery pack auxiliary discharge method to solve the problem that the lithium battery discharge performance cannot meet the working condition under the condition of strict requirements on the working voltage.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a lithium battery pack auxiliary discharge method, comprising a lithium battery stack, a protection board, a supercapacitor and a discharge / charging socket; the lithium battery stack, the protection board, the supercapacitor and the discharge / charging socket are electrically connected to form a discharge circuit, and the discharge capacity of the lithium battery pack is improved through the fast charging and fast discharging characteristics of the supercapacitor, so that the operating voltage of the lithium battery pack is within a specific range, thereby achieving the effect of auxiliary discharge.

[0005] Furthermore, the protection board is a protection board with communication function, and the power supply output is controlled by an external control signal.

[0006] Furthermore, the discharge / charge sockets are selected to be discharge / charge sockets with the same or different ports.

[0007] Furthermore, the supercapacitor is connected in parallel with the lithium battery stack and then in series with the protection board to form a current loop.

[0008] Furthermore, the supercapacitor is composed of a plurality of supercapacitors connected in series.

[0009] Furthermore, the withstand voltage of the supercapacitors after being connected in series is higher than the voltage of the lithium battery stack, thereby preventing the supercapacitors from being overcharged.

[0010] Furthermore, the capacity of the supercapacitor is determined according to the energy required to be borne. The capacity of the supercapacitor should match the energy borne, and the optimal value between the supercapacitor capacity and the auxiliary discharge capacity is found.

[0011] Furthermore, supercapacitors eliminate large pulse currents through their fast charging and fast discharging characteristics, thereby achieving the purpose of auxiliary discharge.

[0012] Beneficial effects of the present invention:

[0013] 1. This solution solves the technical difficulties of lithium battery application under existing lithium battery technology, which is superimposed on constant power discharge with large pulse discharge, limited volume and weight, and strict requirements on working voltage. It uses supercapacitors in parallel with the positive and negative electrodes of the lithium battery stack and connects to the protection board to assist the lithium battery stack in large pulse discharge and increase the voltage value of the lithium battery pack during discharge. The charging of the supercapacitor is completed by the lithium battery stack. When receiving the external discharge signal, the internal circuit of the protection board is connected, and the supercapacitor and the lithium battery stack discharge together, meeting the demanding discharge conditions of superimposed large pulse discharge under constant power discharge.

[0014] 2. This solution absorbs and releases large pulse currents, thereby reducing the impact on the lithium battery pack, reducing the stress and temperature rise inside the battery, and extending the battery life.

[0015] 3. Supercapacitors can respond quickly to load changes, allowing the system to quickly provide the required energy when high power demand is present, while the lithium battery pack continues to supply power when low power demand is present, thereby optimizing energy management and improving the overall efficiency of the system. At the same time, due to the low internal resistance of supercapacitors, energy loss during high current discharge can be reduced, thereby improving the energy utilization of the system.

[0016] 4. As a backup energy source, supercapacitors can provide temporary energy support when a lithium battery pack fails. At the same time, the communication function of the protection board can realize real-time monitoring and fault isolation. Once a problem is found, the faulty part can be quickly cut off to prevent the fault from spreading, thereby achieving the purpose of improving the reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a circuit diagram of a lithium battery pack auxiliary discharge method. DETAILED DESCRIPTION

[0018] The following is further described in detail through specific implementation methods:

[0019] The embodiment is basically as shown in the attached Figure 1 As shown:

[0020] A lithium battery pack auxiliary discharge method, comprising a lithium battery stack, a protection plate, a super capacitor and a discharge / charge socket;

[0021] The lithium battery stack, protection board, supercapacitor and discharge / charging socket are connected in parallel to form a discharge circuit. Through the fast charging and fast discharging characteristics of the supercapacitor, the discharge capacity of the lithium battery pack is improved, large pulse current is eliminated, and the operating voltage of the lithium battery pack is within a specific range, thereby achieving the effect of auxiliary discharge.

[0022] The protection board is a protection board with communication function, and the power supply output is controlled by an external control signal.

[0023] The discharge / charging sockets can be either the same or different discharge / charging sockets.

[0024] A supercapacitor is composed of multiple supercapacitors connected in series. The capacity of the supercapacitor is determined by the energy it needs to bear. The capacity of the supercapacitor should match the energy it needs to bear, and the optimal value between the supercapacitor capacity and the auxiliary discharge capacity should be found. After the supercapacitors are connected in series, the withstand voltage value is higher than the voltage of the lithium battery stack to prevent the supercapacitor from being overcharged.

[0025] The specific implementation process is as follows:

[0026] A discharge circuit is formed by the lithium battery stack G, the protection board AP, the discharge / charging socket XS1 and the supercapacitor C. When the protection board receives an external control discharge signal through the communication function, the internal circuit of the protection board is connected, and the lithium battery stack and the supercapacitor perform constant power discharge together. Since the lithium battery stack and the supercapacitor are connected in parallel, the supercapacitor is charged while discharging. When constant power discharge is superimposed on large pulse discharge, the power of the supercapacitor is quickly consumed. The supercapacitor eliminates the influence of large pulse current on the voltage of the lithium battery stack to a certain extent, so that the discharge voltage of the lithium battery pack can be increased to meet the discharge working condition requirements; when the protection board receives an external control power-off signal through the communication function, the internal circuit of the protection board is disconnected, and the lithium battery stack and the supercapacitor stop powering the equipment.

[0027] In the present invention, the lithium battery auxiliary discharge method is helpful to the working conditions of constant power discharge superimposed on large pulse discharge, especially at the end of discharge, when the capacity of the lithium battery pack decreases and the auxiliary discharge capability of the supercapacitor is further highlighted. At this time, the effect of the lithium battery auxiliary discharge method is more significant.

Claims

1. A lithium battery auxiliary discharge method, characterized in that: It includes a lithium battery stack, a protection board, a supercapacitor and a discharge / charge socket; the lithium battery stack, the protection board, the supercapacitor and the discharge / charge socket are electrically connected to form a discharge circuit. Through the fast charging and fast discharging characteristics of the supercapacitor, the discharge capacity of the lithium battery pack is improved, and the operating voltage of the lithium battery pack is within a specific range, thereby achieving the effect of auxiliary discharge.

2. A lithium battery auxiliary discharge method according to claim 1, characterized in that: The protection board is a protection board with communication function, and the power supply output is controlled by an external control signal.

3. A lithium battery auxiliary discharge method according to claim 2, characterized in that: The discharge / charge sockets are selected from discharge / charge sockets with the same or different ports.

4. A lithium battery auxiliary discharge method according to claim 3, characterized in that: The supercapacitor is connected in parallel with the lithium battery stack and then in series with the protection board to form a current loop.

5. A lithium battery auxiliary discharge method according to claim 4, characterized in that: The supercapacitor is composed of a plurality of supercapacitors connected in series.

6. A lithium battery auxiliary discharge method according to claim 5, characterized in that: The withstand voltage of the supercapacitors after being connected in series is higher than the voltage of the lithium battery stack, thereby preventing the supercapacitors from being overcharged.

7. A lithium battery auxiliary discharge method according to claim 6, characterized in that: The capacity of the supercapacitor is determined by the energy it needs to bear. The capacity of the supercapacitor should match the energy it needs to bear, and the optimal value between the supercapacitor capacity and the auxiliary discharge capacity should be found.

8. A lithium battery auxiliary discharge method according to claim 7, characterized in that: Supercapacitors eliminate large pulse currents through their fast charging and fast discharging characteristics, thereby achieving the purpose of auxiliary discharge.

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