Quick charging system for battery of electric motorcycle

Abstract

The utility model relates to the field of rapid energy supplement of electric motorcycles, and discloses an electric motorcycle battery rapid charging system which comprises at least two battery packs, each battery pack is formed by connecting at least two battery monomers in series, and a conductive series bridge is arranged between the battery packs. A first change-over switch is arranged between the positive electrode of the previous-stage battery pack, the positive electrode of the next-stage battery pack and one end of the series bridge; a second change-over switch is arranged between the negative electrode of the upper-stage battery pack, the negative electrode of the lower-stage battery pack and one end of the series bridge, and series-parallel connection switching is carried out on the multi-stage battery packs through the first change-over switch and the second change-over switch, so that quick charging of the battery of the electric motorcycle is realized, and the cruising ability is increased.

Description

Technical Field

[0001] The present application relates to the field of rapid energy replenishment for electric motorcycles, and in particular to a rapid battery charging system for electric motorcycles. Background Art

[0002] High-speed electric motorcycles replace the fuel-powered motorcycle with a DC battery. They can typically reach speeds of 100 km / h. To achieve the same range as fuel-powered motorcycles, they must carry larger batteries. One approach to increasing capacity is to connect multiple battery packs in parallel to ensure sufficient battery life to power the high-speed electric motorcycle. For example, the current battery packs powering electric motorcycles are 80V, 45Ah. While increasing the number of battery packs can extend range, the greater the number of packs, the longer it takes to fully charge the battery, and current high-voltage charging stations are not suitable for charging these batteries.

[0003] Furthermore, the battery pack is directly solidified to a structure exceeding 200V. Although this structure can directly meet the requirements of charging with DC charging stations for electric vehicles (DC charging stations for electric vehicles generally have an output voltage range of 200-1000V), the battery output voltage exceeds 200V. Due to the high output voltage, it cannot directly power the common electric motorcycle electronic control and motor (common electric motorcycle motor control platforms are 48V, 72V, 96V, etc.).

[0004] Therefore, it is an important current research direction to be able to provide long-term endurance for high-speed electric motorcycles and to use the DC charging piles currently used to charge electric vehicles for rapid energy replenishment. Summary of the Invention

[0005] The present invention aims to provide an electric motorcycle battery fast charging system to achieve the purpose of both providing long-term endurance for high-speed electric motorcycles and quickly replenishing energy using DC charging piles currently used to charge electric vehicles.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: an electric motorcycle battery fast charging system, comprising at least two battery packs, each battery pack consisting of at least two battery cells connected in series, a conductive series bridge being provided between the battery packs, and a first switching switch being provided between the positive electrode of the upper-level battery pack, the positive electrode of the lower-level battery pack and one end of the series bridge, based on the direction of current flow; a second switching switch being provided between the negative electrode of the upper-level battery pack, the negative electrode of the lower-level battery pack and one end of the series bridge, a movable end of the first switching switch being connected to the positive electrode of the lower-level battery pack, for connecting the positive electrode of the lower-level battery pack with the positive electrode of the upper-level battery pack or the series bridge circuit, a movable end of the second switching switch being connected to the negative electrode of the upper-level battery pack, for connecting the negative electrode of the upper-level battery pack with the negative electrode of the lower-level battery pack or the series bridge circuit.

[0007] The charging and discharging principle of this solution is to create a flexible switching structure for the circuits between battery packs. When powering a high-speed electric motorcycle, the battery packs are connected in parallel so that the battery output voltage meets the voltage requirements of the motorcycle's drive motor. Connecting the battery packs in parallel is equivalent to each battery pack supplying energy to the motorcycle in turn. The more batteries connected in parallel, the longer the electric motorcycle's range. When charging the high-speed electric motorcycle's batteries, the battery packs are switched in series so that the battery charging voltage increases to the output voltage of a DC fast charger. At this point, the battery packs can be charged using a DC fast charger.

[0008] The advantages of this solution are:

[0009] First, by controlling the switching switch, the battery packs used in the battery are switched into parallel connection and series connection, which not only meets the requirement of increasing the cruising range of the electric motorcycle, but also enables the electric motorcycle to be quickly charged using a DC charging pile.

[0010] To prevent short circuits, the active terminal of the first switching switch is connected to the positive electrode of the next-stage battery pack, connecting the positive electrode of the next-stage battery pack to the positive electrode of the previous-stage battery pack or a series bridge circuit. The active terminal of the second switching switch is connected to the negative electrode of the previous-stage battery pack, connecting the negative electrode of the previous-stage battery pack to the negative electrode of the next-stage battery pack or a series bridge circuit. This prevents short circuits in the battery packs during the circuit switching process, ensuring the safety of the entire battery pack.

[0011] Furthermore, the first or second switch is a single-pole double-throw switch. Since there is no short circuit in the basic solution, manual switching through the single-pole double-throw switch can also achieve series-parallel switching, which does not require other additional electrical components and can reduce costs.

[0012] Furthermore, the total rated voltage of all battery packs connected in series is 200V~1000V. The total rated voltage of the battery packs in series is 200V~1000V, which can be adapted to the current mainstream 200V~1000V DC fast charging stations. The rated voltage limit of a single battery pack is to ensure that the battery can adapt to the voltage of the electric motorcycle when discharged in parallel.

[0013] The battery of the electric motorcycle uses two battery packs as the basic units for series-parallel switching, which can minimize the difficulty of switching.

[0014] Furthermore, the electric motorcycle battery fast charging system also includes an insulating housing for accommodating the battery packs, the insulating housing being provided with a terminal box. The insulating housing encapsulates the multiple battery packs, and the insulating housing can be structurally adapted to the reserved space of the electric motorcycle.

[0015] Furthermore, all battery packs have their positive and negative electrodes introduced into the terminal box of the insulating shell through wires. The first-level battery pack leads the positive electrode to the insulating shell as the positive electrode of the charge and discharge connection terminal, and the last-level battery pack leads the negative electrode to the shell as the negative electrode of the charge and discharge connection terminal; by introducing the positive and negative electrodes of the battery pack into the insulating shell, the circuit layout can be completed directly on the insulating shell, and the battery pack is also easy to replace.

[0016] Furthermore, the series bridge is a copper bar wrapped in an insulating layer, with a snap-in connector at each end for connecting to the active terminal of a single-pole double-throw switch. If the switch is a manual single-pole double-throw switch, the snap-in connector can ensure a tighter connection between the active terminal of the switch and the series bridge, preventing tip discharge.

[0017] Furthermore, the series bridge is a copper bar wrapped with insulation on the outside, and elastic copper sheets combined with the protrusions of the DC relay are provided at both ends of the copper bar; if the switching switch is a DC relay, the elastic copper sheet is tightly fitted with the contacts of the DC relay.

[0018] Finally, the electric motorcycle battery fast charging system also includes a controller that controls the switching switch action. The controller is used to obtain the connection status of the battery system and the charging pile. When it is known that the battery is connected to the charging pile, the controller controls the switching switch action to switch all battery packs into a series structure; when it is known that the battery is disconnected from the charging pile, the controller controls the switching switch action to switch all battery packs into a parallel structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the circuit connection diagram of the electric motorcycle battery pack;

[0020] Figure 2 This is the circuit connection diagram of the electric motorcycle battery pack in the discharge state;

[0021] Figure 3 Circuit connection diagram for the electric motorcycle battery pack when charging;

[0022] Figure 4 Schematic diagram of the structure of the battery shell packaging of an electric motorcycle. DETAILED DESCRIPTION

[0023] The following is further described in detail through specific implementation methods:

[0024] Example 1:

[0025] like Figure 1As shown, an electric motorcycle battery fast charging system includes two battery packs, each with a rated voltage of 144V and a rated capacity of 60Ah; both battery packs are composed of multiple small battery cells connected in series.

[0026] A conductive series bridge 2 is provided between the two battery packs. Based on the direction of current flow, a first single-pole double-throw switch S1 is provided between the positive electrode of battery pack 1 1, the positive electrode of battery pack 2 3, and one end of the series bridge 2; a second single-pole double-throw switch S2 is provided between the negative electrode of battery pack 1 1, the negative electrode of battery pack 2 3, and one end of the series bridge 2.

[0027] The moving end of the first single-pole double-throw switch S1 is connected to the positive electrode of the second battery pack 3, so as to connect the positive electrode of the second battery pack 3 with the positive electrode of the first battery pack 1 or the series bridge 3 circuit.

[0028] The moving end of the second single-pole double-throw switch S2 is connected to the negative electrode of battery pack 1, and is used to connect the negative electrode of battery pack 1 with the negative electrode of battery pack 2 3 or the series bridge 1 circuit.

[0029] like Figure 2 As shown, when the electric motorcycle battery is discharging, that is, powering the electric motorcycle, the active end of the first single-pole double-throw switch S1 disconnects the series bridge 2, connecting the positive electrode of battery pack 2 3 to the positive electrode of battery pack 1 1. The active end of the second single-pole double-throw switch S2 disconnects the series bridge 2, connecting the negative electrode of battery pack 1 1 to the negative electrode of battery pack 2 3. The battery packs are switched to a parallel connection, powering the electric motorcycle at a rated voltage of 144V.

[0030] like Figure 3 As shown, when charging the electric motorcycle battery through a DC charging station, the moving end of the first single-pole double-throw switch S1 is connected to the series bridge, that is, the positive electrode of battery pack 2 3 is connected to the series bridge 2; the moving end of the second single-pole double-throw switch S2 is connected to the series bridge 2, that is, the negative electrode of battery pack 1 1 is connected to the series bridge 2. Battery pack 1 1 and battery pack 2 3 form a series structure.

[0031] When two battery packs are connected in series, the total voltage of the battery packs is 288V. A charging station with an output voltage of 280V can be used to quickly charge the connected batteries. Depending on the actual output voltage of the charging station, the number of small batteries in the series battery pack can be increased or decreased to match the actual output voltage of the charging station.

[0032] By selecting the connection mode of the active ends of the first single-pole double-throw switch S1 and the second single-pole double-throw switch S2, the battery pack will never be short-circuited during the circuit switching process, thereby ensuring the safety of the entire battery pack.

[0033] Example 2

[0034] The basic structure is the same as that of Example 1, the only difference being that the first and second single-pole double-throw switches in Example 1 are replaced by first and second DC relays, and a controller is added to control the first and second DC relays.

[0035] The static connection point of the first DC relay is connected to the positive terminal of Battery Pack 2, its normally open contact is connected to a contact extending from one end of the series bridge, and its normally closed contact is connected to the positive terminal of Battery Pack 1. Similarly, the static connection point of the second DC relay is connected to the negative terminal of Battery Pack 1, its normally open contact is connected to a contact extending from one end of the series bridge, and its normally closed contact is connected to the negative terminal of Battery Pack 2. Thus, when the first and second DC relays are in an inactive state, Battery Packs 1 and 2 are connected in parallel, powering the electric motorcycle.

[0036] When the battery needs to be charged, the controller controls the first and second DC relays to operate, and battery pack 1 and battery pack 2 are switched into a series state to meet the needs of the high-voltage charging pile for charging the battery.

[0037] Example 3:

[0038] like Figure 4 As shown, based on Example 1 or Implementation 2, to facilitate wiring connections between battery pack 1 and battery pack 2, 3, an insulating housing 4 is provided outside battery pack 1 and battery pack 2, 3, and the insulating housing 4 is provided with a terminal box 5. The insulating housing encapsulates the battery packs, and the insulating housing 4 can be structurally adapted to the reserved space of the electric motorcycle.

[0039] Both battery pack 1 and battery pack 2 3 have their positive and negative electrodes connected to a terminal box 5 on an insulating housing 4 via wires. Battery pack 1 leads its positive electrode to the insulating housing 4 as the positive electrode of a charge / discharge connection terminal 6, while battery pack 2 leads its negative electrode to the insulating housing 4 as the negative electrode of a charge / discharge connection terminal 6. A series bridge, a first single-pole double-throw switch S1, and a second single-pole double-throw switch S2 are installed in the terminal box 5. Switching the first and second single-pole double-throw switches S1 and S2 allows battery pack 1 and battery pack 2 3 to be switched in series and parallel. The single-pole double-throw switches can be replaced with DC relays.

[0040] Example 4:

[0041] According to the requirements of the electric motorcycle's endurance and adaptability to higher voltage DC power charging piles, the number of battery packs can be increased. The switching principle of the increased number of battery packs is the same as that of Example 1 or Example 2, that is, when charging, all battery packs are connected in series, and when powering the electric motorcycle, each battery pack is switched to parallel.

[0042] The above is only an embodiment of the present invention, and the common knowledge such as the specific technical solutions and / or characteristics in the solution are not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the description can be used to interpret the content of the claims.

Claims

1. An electric motorcycle battery fast charging system, characterized in that: The invention comprises at least two battery packs, each battery pack being composed of at least two battery cells connected in series, a conductive series bridge being provided between the battery packs, and a first switching switch being provided between the positive electrode of the upper-level battery pack, the positive electrode of the lower-level battery pack and one end of the series bridge, based on the direction of current flow; a second switching switch being provided between the negative electrode of the upper-level battery pack, the negative electrode of the lower-level battery pack and one end of the series bridge, a movable end of the first switching switch being connected to the positive electrode of the lower-level battery pack, for connecting the positive electrode of the lower-level battery pack with the positive electrode of the upper-level battery pack or the series bridge circuit, and a movable end of the second switching switch being connected to the negative electrode of the upper-level battery pack, for connecting the negative electrode of the upper-level battery pack with the negative electrode of the lower-level battery pack or the series bridge circuit.

2. The electric motorcycle battery fast charging system according to claim 1, characterized in that: The first switch or the second switch is a single-pole double-throw switch.

3. The electric motorcycle battery fast charging system according to claim 1, characterized in that: The first switch or the second switch is a DC relay.

4. The electric motorcycle battery fast charging system according to claim 1, characterized in that: The total rated voltage of all battery packs connected in series is 200V~1000V.

5. The electric motorcycle battery fast charging system according to claim 1, characterized in that: It also includes an insulating shell for accommodating the battery pack, and the insulating shell is provided with a terminal box.

6. The electric motorcycle battery fast charging system according to claim 5, characterized in that: All battery packs have their positive and negative poles connected to the terminal box of the insulating shell through wires. The first-level battery pack leads the positive pole to the insulating shell as the positive pole of the charge and discharge connection end, and the last-level battery pack leads the negative pole to the shell as the negative pole of the charge and discharge connection end.

7. The electric motorcycle battery fast charging system according to claim 2, characterized in that: The series bridge is a copper bar with an external insulation layer, and both ends of the copper bar are provided with a card connector connected to the moving end of the single-pole double-throw switch.

8. The electric motorcycle battery fast charging system according to claim 3, characterized in that: The series bridge is a copper bar with insulation wrapped around the outside, and elastic copper sheets combined with the protrusions of the DC relay are provided at both ends of the copper bar.

9. The electric motorcycle battery fast charging system according to claim 8, characterized in that: It also includes a controller for controlling the switching switch action, which is used to obtain the connection status of the battery system and the charging pile. When it is known that the battery is connected to the charging pile, the controller controls the switching switch action to switch all battery packs into a series structure; when it is known that the battery is disconnected from the charging pile, the controller controls the switching switch action to switch all battery packs into a parallel structure.

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