Control module of battery pack module series-parallel connection change-over switch for new energy vehicle

Abstract

A control module of a new energy vehicle battery pack module series-parallel connection change-over switch comprises a control unit, a vehicle-mounted control system, a vehicle-mounted low-voltage power source, a vehicle-mounted battery pack, an electric actuator and a position sensor, the control unit is provided with a power supply terminal, a grounding terminal and six signal terminals, the power supply terminal is connected to the vehicle-mounted low-voltage power source, and the grounding terminal is connected to the vehicle-mounted low-voltage power source. The grounding terminal is connected to a ground wire; in the six signal terminals, the first signal terminal is electrically connected to the in-vehicle control system, the second signal terminal and the third signal terminal are electrically connected to the electric actuator, the fourth signal terminal, the fifth signal terminal and the sixth signal terminal are all electrically connected to the position sensor, and the vehicle-mounted battery pack is provided with a power supply circuit and a change-over switch. The electric actuator acts on the change-over switch to drive the change-over switch. According to the scheme, the control unit controls the change-over switch to switch the series connection state or the parallel connection state of the power supply circuit, so that the power supply circuit can correspond to two conditions of 400V charging and 800V charging.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric vehicle battery charging control, and concretely relates to a control module of battery pack module string parallel conversion switch for new energy vehicle. BACKGROUND

[0002] Automotive electrification has become an irreversible trend, and the new energy vehicle industry has entered a fast lane. The development of the new energy vehicle industry has been greatly promoted by technological progress. The progress of power battery technology compensates for the range gap. The current electric vehicle technology level, the voltage level of the battery pack is generally in the range of 400V, but the traditional electric vehicle charging time is long, which gradually becomes one of the obstacles to the rapid popularization of electric vehicles. Users' demand for charging speed is increasing, so 800V high-voltage fast charging technology has emerged, aiming to achieve fast charging, shorten charging time, and improve user experience.

[0003] An effective method to shorten the charging time and improve the charging rate is to increase the charging power. One way to increase the charging power is to increase the charging current on the existing 400V voltage battery pack platform. However, the power loss of the charging circuit, i.e. the heating power, is proportional to the square of the charging current. The increase in charging current will result in a significant increase in power loss from the charging device to the battery pack through the charging cable, i.e. the heating power of the entire circuit will increase significantly. This method increases the charging current while reducing the heating power. The resistance value of the entire charging circuit needs to be reduced, and the charging device needs to use higher specification connectors and thicker diameter charging cables. Not only does this increase the construction cost, but also the use of thick and heavy charging cables is very inconvenient.

[0004] Another way to increase the charging power is to increase the charging voltage, such as using 800V fast charging. This method can multiply the charging power without increasing the charging current. Because this method does not increase the charging current, the power loss of the entire charging circuit, i.e. the heating power, will not increase, so the charging power will not increase extra while increasing the charging power, and the charging device does not need to be replaced with a larger diameter charging cable.

[0005] Compared with 400V low voltage, electric vehicles using 800V battery pack systems have many advantages, such as doubling the charging rate while maintaining the same charging current, and reducing the charging current while maintaining the same charging power. This design can reduce the size of internal conductive parts and the amount of conductive metal materials, improve the charging efficiency of the vehicle, and reduce the manufacturing cost and weight of the vehicle.

[0006] However, the 400V battery pack platform and the 800V battery pack platform coexist in the electric vehicle market, and the voltage of the vehicle battery system and the voltage of the charging device do not match, for example, the 800V battery pack platform vehicle cannot directly use the 400V charging device, and the 400V battery pack platform vehicle cannot directly use the 800V charging device. This condition will restrict the charging process of the electric vehicle and reduce the user experience. Therefore, the charging voltage of the electric vehicle battery pack may not match the charging device voltage value, which is a problem that needs to be solved. Utility model content

[0007] The utility model aims at solving the charging voltage of the battery pack in the prior art may not match the charging device voltage value, and the problem of affecting charging.

[0008] In order to solve the above problems, the utility model provides a control module of battery pack module series-parallel conversion switch for new energy vehicle, including control unit, vehicle control system, vehicle low voltage power supply, vehicle battery pack, electric actuator and position sensor, the control unit is equipped with power supply terminal, ground terminal and six signal terminals, the power supply terminal is connected to vehicle low voltage power supply to realize the power supply of control unit, the ground terminal is connected to the ground wire, among six signal terminals, the first signal terminal is electrically connected to the vehicle control system, the second signal terminal and the third signal terminal are electrically connected to the electric actuator, the fourth signal terminal, the fifth signal terminal and the sixth signal terminal are electrically connected to the position sensor, the vehicle battery pack has power supply circuit and conversion switch for switching power supply circuit to series state or parallel state, the electric actuator acts on the conversion switch to realize the driving of conversion switch, and the position sensor is used to detect the state of the conversion switch.

[0009] In the above scheme, according to the voltage adaptation state of the vehicle battery pack and the external charging device, the vehicle control system sends instructions to the control unit through the first signal terminal, and the control unit controls the electric actuator to drive the conversion switch through the second signal terminal and the third signal terminal after receiving the instructions, so that the conversion switch switches the series state or the parallel state of the power supply circuit, and the series state and the parallel state of the power supply circuit correspond to the two cases of 400V charging and 800V charging. The position sensor identifies whether the electric actuator switches the conversion switch to the position by detecting the state of the conversion switch.

[0010] In an improved scheme, the electric actuator is a motor, and the motor drives the conversion switch to move by forward rotation or reverse rotation, so that the conversion switch switches the series state or the parallel state of the power supply circuit. The motor drives the conversion switch to switch in a mechanical form, and the reliability is high.

[0011] In an improved scheme, the switch has a first static contact, a second static contact and a moving contact, the first and second static contacts are fixedly arranged, the moving contact is located between the first and second static contacts, the output end of the motor acts on the moving contact, the motor drives the moving contact to abut to the first static contact when it rotates forward, and the motor drives the moving contact to abut to the second static contact when it reverses; when the moving contact abuts to the first static contact, the power supply circuit is in a series state, and when the moving contact abuts to the second static contact, the power supply circuit is in a parallel state.

[0012] In an improved scheme, the position sensor sends a feedback signal to the control unit when it detects that the moving contact abuts to the first static contact, so that the control unit controls the motor to stop rotating forward; the position sensor sends a feedback signal to the control unit when it detects that the moving contact abuts to the second static contact, so that the control unit controls the motor to stop reversing, thereby avoiding the problem of damage caused by excessive rotation of the motor.

[0013] In an improved scheme, the vehicle-mounted control system outputs a high level or a low level to the control unit, so that the control unit controls the forward rotation or reverse rotation of the motor according to the received high level or low level signal.

[0014] In an improved scheme, the vehicle-mounted control system sends a code to the control unit through LIN communication, so that the control unit controls the forward rotation or reverse rotation of the motor according to the received code. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a whole schematic diagram of a control module of a battery pack module string-parallel switch for a new energy vehicle.

[0016] Figure 2 It is a schematic diagram of a switch of a battery pack module string-parallel switch for a new energy vehicle.

[0017] MARKED WITH REFERENCE NUMBERS,

[0018] 1, control unit; 11, first signal terminal; 12, second signal terminal; 13, third signal terminal; 14, fourth signal terminal; 15, fifth signal terminal; 16, sixth signal terminal; 17, power supply terminal; 18, ground terminal; 2, vehicle-mounted control system; 3, vehicle-mounted low-voltage power supply; 4, motor; 5, position sensor; 6, vehicle-mounted battery pack; 61, switch; 611, first static contact; 612, second static contact; 613, moving contact. DETAILED DESCRIPTION

[0019] It should be understood by those skilled in the art that the following embodiments are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments as needed in order to adapt to specific application occasions.

[0020] In the description of the following embodiments, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0021] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0022] The present application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0023] Please refer to Figure 1 and Figure 2 The control module of the battery pack module string parallel switch 61 for a new energy vehicle provided by the embodiments of the present application comprises a control unit 1, a vehicle-mounted control system 2, a vehicle-mounted low-voltage power supply 3, a vehicle-mounted battery pack 6, an electric actuator and a position sensor 5. The control unit 1 is provided with a power supply terminal 17, a ground terminal 18, and six signal terminals. The power supply terminal 17 is connected to the vehicle-mounted low-voltage power supply 3 to realize power supply of the control unit 1, and the ground terminal 18 is connected to the ground wire. Among the six signal terminals, the first signal terminal 11 is electrically connected to the in-vehicle control system, the second signal terminal 12 and the third signal terminal 13 are electrically connected to the electric actuator, the fourth signal terminal 14, the fifth signal terminal 15 and the sixth signal terminal 16 are all electrically connected to the position sensor 5. The vehicle-mounted battery pack 6 has a power supply circuit and a conversion switch 61 for switching the power supply circuit to a series state or a parallel state. The electric actuator acts on the conversion switch 61 to drive the conversion switch 61, and the position sensor 5 is used to detect the state of the conversion switch 61.

[0024] In the above scheme, according to the voltage adaptation state of the vehicle-mounted battery pack 6 and the external charging device, the in-vehicle control system sends an instruction to the control unit 1 through the first signal terminal 11, and after the control unit 1 receives the instruction, it controls the electric actuator to drive the switch 61 through the second signal terminal 12 and the third signal terminal 13, so that the switch 61 switches the series state or the parallel state of the power supply circuit, and the series state and the parallel state of the power supply circuit correspond to the two cases of 400V charging and 800V charging; the position sensor 5 identifies whether the electric actuator switches the switch 61 to the position by detecting the state of the switch 61.

[0025] In the present embodiment, the vehicle-mounted low-voltage power supply 3 is preferably a conventional 12V power supply, and the power supply terminal 17 of the control unit 1 is electrically connected to the positive electrode of the vehicle-mounted low-voltage power supply 3.

[0026] In the present embodiment, the electric actuator is a motor 4, which drives the switch 61 to move by forward rotation or reverse rotation, so that the switch 61 switches the series state or the parallel state of the power supply circuit, and the motor 4 drives the switch 61 to switch in a mechanical form, which has high reliability.

[0027] The switch 61 has a first stationary contact 611, a second stationary contact 612, and a movable contact 613, the first stationary contact 611 and the second stationary contact 612 are fixedly arranged, and the movable contact 613 is located between the first stationary contact 611 and the second stationary contact 612, the output end of the motor 4 acts on the movable contact 613, the motor 4 drives the movable contact 613 to abut against the first stationary contact 611 when it rotates forward, and the motor 4 drives the movable contact 613 to abut against the second stationary contact 612 when it rotates reversely; when the movable contact 613 abuts against the first stationary contact 611, the power supply circuit is in a series state, and when the movable contact 613 abuts against the second stationary contact 612, the power supply circuit is in a parallel state.

[0028] It should be understood that the electric actuator can also be in other forms in the prior art as long as it can realize the switching of the series state or the parallel state of the power supply circuit, and the specific design is not limited.

[0029] In the present embodiment, the position sensor 5 detects that the movable contact 613 abuts against the first stationary contact 611 and sends a feedback signal to the control unit 1, so that the control unit 1 controls the motor 4 to stop forward rotation; the position sensor 5 detects that the movable contact 613 abuts against the second stationary contact 612 and sends a feedback signal to the control unit 1, so that the control unit 1 controls the motor 4 to stop reverse rotation, thereby avoiding the problem of damage caused by excessive rotation of the motor 4.

[0030] As to the signal transmission mode between the vehicle control system 2 and the control unit 1, in embodiment one, the vehicle control system 2 outputs high level or low level to the control unit 1, so that the control unit 1 controls the forward rotation or reverse rotation of the motor 4 according to the received high level or low level signal; or in embodiment two, the vehicle control system 2 sends a code to the control unit 1 through LIN communication, so that the control unit 1 controls the forward rotation or reverse rotation of the motor 4 according to the received code.

[0031] It should be noted that in the description of the present application, the terms indicating the direction or position relationship such as "inner", "outer" and the like are based on the direction or position relationship shown in the drawings, which is merely for the convenience of description, and does not indicate or imply that the device or member must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application; all directional indications (such as up, down, left, right, front, back, inner, outer) are only used to explain the relative position relationship, movement condition and the like between components in a certain specific posture, and if the specific posture changes, the directional indications will also change accordingly.

[0032] In the description of the present application, the description referring to the terms "one embodiment", "some embodiments", "in this embodiment", "specific example" or "some examples" and the like means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0033] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or replacements easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A control module of a new energy vehicle battery pack module string parallel-serial conversion switch (61), characterized in that, The control unit (1) includes a power supply terminal (17), a ground terminal (18), and six signal terminals, the power supply terminal (17) is connected to the vehicle low-voltage power supply (3) to supply power to the control unit (1), and the ground terminal (18) is connected to the ground; among the six signal terminals, the first signal terminal (11) is electrically connected to the vehicle control system, the second signal terminal (12) and the third signal terminal (13) are electrically connected to the electric actuator, and the fourth signal terminal (14), the fifth signal terminal (15), and the sixth signal terminal (16) are all electrically connected to the position sensor (5); the vehicle battery pack (6) has a power supply circuit and a switch (61) for switching the power supply circuit to a series state or a parallel state, the electric actuator acts on the switch (61) to drive the switch (61), and the position sensor (5) is used to detect the state of the switch (61).

2. The control module of the new energy vehicle battery pack module string parallel-serial conversion switch (61) according to claim 1, characterized in that, The electric actuator is a motor (4), which drives the switch (61) to move by forward rotation or reverse rotation, so that the switch (61) switches the series state or parallel state of the power supply circuit.

3. The control module of the new energy vehicle battery pack module string parallel-serial conversion switch (61) according to claim 2, characterized in that, The switch (61) has a first stationary contact (611), a second stationary contact (612), and a movable contact (613), the first stationary contact (611) and the second stationary contact (612) are fixedly arranged, and the movable contact (613) is located between the first stationary contact (611) and the second stationary contact (612), the output end of the motor (4) acts on the movable contact (613), the motor (4) drives the movable contact (613) to abut against the first stationary contact (611) when it rotates forward, and the motor (4) drives the movable contact (613) to abut against the second stationary contact (612) when it rotates reversely; when the movable contact (613) abuts against the first stationary contact (611), the power supply circuit is in a series state, and when the movable contact (613) abuts against the second stationary contact (612), the power supply circuit is in a parallel state.

4. The control module of the new energy vehicle battery pack module parallel-serial conversion switch (61) according to claim 3, characterized in that, When the position sensor (5) detects that the movable contact (613) abuts against the first stationary contact (611), it sends a feedback signal to the control unit (1), so that the control unit (1) controls the motor (4) to stop rotating forward; when the position sensor (5) detects that the movable contact (613) abuts against the second stationary contact (612), it sends a feedback signal to the control unit (1), so that the control unit (1) controls the motor (4) to stop rotating reversely.

5. The control module of the new energy vehicle battery pack module parallel-serial conversion switch (61) according to any one of claims 2-4, characterized in that, The vehicle control system (2) outputs high or low level to the control unit (1), so that the control unit (1) controls the forward rotation or reverse rotation of the motor (4) according to the received high or low level signal.

6. The control module of the new energy vehicle battery pack module parallel-serial conversion switch (61) according to any one of claims 2-4, characterized in that, The vehicle control system (2) sends a code to the control unit (1) through LIN communication, so that the control unit (1) controls the forward rotation or reverse rotation of the motor (4) according to the received code.

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