Motor vehicle with an 800 v or 400 v charging architecture comprising a DC connector module provided with a deactivatable capacitance branch

Abstract

The invention relates to a vehicle comprising a motor (M), a converter module (MI), a DC enclosure module (MDC), and a battery module (MB) comprising an 800 V battery (BT). A high-voltage circuit (HV) connects the converter module (MI) to the DC enclosure module (MDC), and to the battery (BT). A connector (CX) is connected to an 800 V negative branch, and has a 400 V circuit branch (LV) connected to the motor (M). The converter module (MI) comprises an AC-to-DC converter connected to the motor (M) and to the 800 V battery (BT). According to the invention, the DC connector module (DCL) comprises two capacitance branches (B1, B2), wherein one is deactivatable and connected to a branch (D2) of the 400 V branch (LV). The invention also relates to a method and a program based on such a vehicle.

Description

[0001] MOTOR VEHICLE WITH 800V OR 400V CHARGING ARCHITECTURE, INCLUDING A DC CONNECTOR MODULE EQUIPPED WITH A DEACTIVABILABLE CAPACITANCE BRANCH

[0002] DESCRIPTION

[0003]

[0001] The invention relates to the field of 800V motor vehicle charging architectures suitable for both 400V and 800V charging stations.

[0004]

[0002] A prior art architecture is illustrated in Figure 1.

[0005]

[0003] The conventional architecture comprises a motor M connected to a converter module Ml, a DC box module MDC connected to the converter module Ml, and a battery module connected to the DC box module MDC.

[0006]

[0004] The converter module Ml comprises an AC / DC converter connected to a DCL (or “DC-Link” in English) DC connector module.

[0007]

[0005] The AC / DC converter receives a three-phase alternating current from the motor M and transmits it to the battery at 800V LV via the DC connector module DCL, then the DC box module MDC. A high-voltage circuit is provided for this purpose, comprising a positive branch at 800V (denoted HV+) in bold solid line in figure 1, and a negative branch in broken line (denoted HV-).

[0008]

[0006] Branches of these branches are provided in the DC housing module MDC to connect to a charging station BC.

[0009]

[0007] In the case of charging on a 400V terminal, a specific circuit (in thin broken line) is used in the DC housing module MDC and the converter module M1, with a specific capacity module D provided in the converter module M1, to reduce the ripple effects of the fast charge. In this case, the current passes through the ripples of the motor M.

[0008] For new electric vehicles, the voltage of the traction battery LV is not fixed, there are vehicles with a 400V battery and others with an 800V battery.

[0010]

[0009] But, on the streets, there are more 400V chargers than 800V chargers. It is therefore very important, for vehicles with an 800V battery, to have the possibility of being charged with 400V chargers.

[0011]

[0010] The solution of the prior art is to use the inductance of the motor M to perform the function of fast charging from a 400V station to an 800V vehicle battery, but it is necessary to add the capacitance D and a contactor E as shown in Figure 1.

[0012]

[0011] This prior art architecture is not optimized because the car includes many elements that will only be used when charging the vehicle on a 400V terminal. These elements contribute to reducing the vehicle's autonomy and take up significant space in the vehicle.

[0013]

[0012] An objective of the present invention is to remedy the defects of the prior art, and in particular to propose a solution making it possible to limit the number of components used when charging on a 400V terminal so as to limit the size and increase the autonomy of the vehicle.

[0014]

[0013] To achieve this objective, the invention proposes a motor vehicle with an electric traction motor, comprising:

[0015] - an engine;

[0016] - a converter module connected to the motor;

[0017] - a DC box module connected to the converter module;

[0018] - a battery module connected to the DC housing module, comprising an 800V battery;

[0019] - a high voltage circuit connecting the converter module to the DC housing module, and to the 800V battery, comprising a negative branch and a positive branch;

[0020] - a charging connector receiving a first branch of the negative branch, and a second branch of a 400V circuit branch connected to the motor, the converter module comprising an AC / DC converter connected to a DC connector module, the AC / DC converter receiving a three-phase alternating current coming from the motor and transmitting it to the battery at 800V via the DC connector module, then the DC housing module, characterized in that the DC connector module comprises at least a first deactivatable capacity branch, which comprises a capacity module, in that the second branch of the 400V circuit branch is connected to said first deactivatable capacity branch, and in that said first deactivatable capacity branch can take:

[0021] - either an activated configuration in which the second branch is connected to the capacity module;

[0022] - or a disabled configuration in which the capacity module is short-circuited and the second branch is connected to the positive branch at 800V.

[0023]

[0014] Connecting the second branch to the capacity module allows charging in boost topology from 400V to 800V.

[0024]

[0015] Advantageously, the invention makes it possible to remove the branch of the high voltage circuit and its switch C, as well as the capacitance module D of the prior art, which limits the size and weight of the architecture.

[0025]

[0016] The arrangement of the invention uses the same components in fast charging with an 800V station or in charging with a 400V station, with respectively deactivation or activation of the capacity module.

[0026]

[0017] In addition, the system allows for fast charging by reusing part of the DC connector module in direct current for charging with a 400V or 800V charging station to an 800V battery.

[0027]

[0018] According to a variant, the DC connector module further comprises a second capacitance branch. This makes it possible to have additional capacitance in the DC connector module.

[0028]

[0019] According to a variant, the first capacitance branch and the second capacitance branch are connected to two separate points of the positive branch, and are connected together to the same point of the negative branch.

[0020] This allows for an optimized circuit in the DC connector module.

[0021] According to a variant, when the first capacitance branch is in the deactivated configuration, the capacitance module is placed in parallel with the second capacitance branch. This allows for stimulating fast charging.

[0029]

[0022] According to a variant, the second branch comprises a first switch, and the first capacitance branch comprises a second switch.

[0030]

[0023] This allows the 400V circuit branch to be deactivated in a simplified manner.

[0031]

[0024] Another object of the invention relates to a method of charging a motor vehicle according to the invention, comprising the following steps:

[0032] - in case of charging with a 400V station, an activation step in which the second branch is connected to the capacity module; and / or

[0033] - when charging with an 800V station, a deactivation step in which the capacity module is short-circuited and the second branch is connected to the positive branch at 800V.

[0034]

[0025] The invention further relates to a computer program comprising program code instructions for executing the steps of the charging method according to the invention, when said program operates on a computer.

[0035]

[0026] The invention will be further detailed by the non-limiting description of variants, and on the basis of the appended figures, in which:

[0036] - [FIG. 1] schematically illustrates a fast-charging vehicle electronic architecture according to the prior art for charging at 800V or 400V; and

[0037] - [FIG. 2] schematically illustrates a fast-charging vehicle electronic architecture according to the invention for charging at 800V or 400V.

[0038]

[0027] The invention relates to a motor vehicle with an electric traction motor, the architecture of which is illustrated in Figure 2. The motor vehicle comprises:

[0039] - an M engine;

[0040] - an Ml converter module;

[0041] - a DC MDC housing module; and

[0042] - a battery module MB comprising an 800V LV battery.

[0028] The converter module M1 is connected to the motor M. The converter module M1 comprises an AC / DC converter connected to a DC connector module DCL. The AC / DC converter receives a three-phase alternating current from the motor M, and transmits it to the 800V LV battery via the DC connector module DCL, then the DC housing module MDC.

[0043]

[0029] For this purpose, the DC box module MDC is connected to the converter module M1, and the battery module MB is connected to the DC box module MDC.

[0044]

[0030] The motor vehicle further comprises an 800V high voltage HV circuit connecting the converter module M1 to the DC housing module MDC, and to the 800V LV battery. The high voltage HV circuit comprises a negative branch (denoted HV-) in a broken line in Figure 2; and a positive branch (denoted HV+) in a bold solid line.

[0045]

[0031] The motor vehicle further comprises a charging connector CX, configured to connect the DC connector module MDC to a charging terminal BC at 400V or 800V.

[0046]

[0032] A connector CX receives a first branch D1 of the negative branch at 800V. The motor vehicle further comprises a 400V circuit branch LV connecting the connector CX of the DC connector module MDC, to the motor M, here, via the converter module M1.

[0047]

[0033] The 400V LV circuit branch is shown in thin broken line in Figure 2.

[0048]

[0034] According to the invention, the DC connector module DCL comprises at least a first deactivatable capacitance branch B1, and preferably a second capacitance branch B2. These capacitance branches B1, B2 each comprise a capacitance module G1, G2.

[0049]

[0035] In particular, the first capacitance branch B1 and the second capacitance branch B2 are connected to two points of the positive branch HV+, and they are connected together to the same point of the negative branch HV-.

[0050]

[0036] In addition, the second branch D2 here comprises a first switch F1, and the first capacitance branch B1 comprises a second switch F2. These are in particular semiconductors. The second switch F2 is arranged between the positive branch at 800V and the capacitance module G1 of the first capacitance branch B1. The second branch D2 is connected to the first capacitance branch B1 between the positive branch and the second switch F2.

[0051]

[0037] Furthermore, according to the invention a second branch D2 of the 400V LV circuit branch is connected to said first deactivatable capacitance branch B1, in particular by means of the first and second switches F1, F2.

[0052]

[0038] Furthermore, said first deactivatable branch can take two different configurations, namely an activated configuration or a deactivated configuration.

[0053]

[0039] In the activated configuration, the second branch D2 is connected to the capacity module G1, in particular by opening the second switch F2, and closing the first switch F1. This makes it possible to charge the battery at 800V BT on a charging station BC at 400V.

[0054]

[0040] In the deactivated configuration, the capacity module G1 is short-circuited and the second branch D2 is connected to the positive branch at 800V. In particular, this is done by closing the first switch F1 and the second switch F2. This allows the battery to be charged at 800V BT on a charging station BC at 800V.

[0055]

[0041] In the illustrated variant, the second branch of capacity B2 does not include a switch.

[0056]

[0042] The vehicle may include direct current filtering modules such as modules G and H. The vehicle may further include a safety function module S (for example those called CHAdeMO in the trade), and various other switches, such as in particular switches A, B. Switch A is for example a 300 A DC-Boost type contactor. The maximum power of the system is 150 kW, with a voltage of 500 V, and a current of 300 A.

[0057]

[0043] The battery can be controlled by a BMS battery management system. Reference I relates to a current measuring device.

[0044] In use, in the case of fast charging with an 800V station, the capacity module G1 is short-circuited by closing the switches F1, F2. We can talk about deactivation. Furthermore, and the second branch D2 is connected to the positive branch at 800V. This is done by closing the first switch F1 and the second switch F2.

[0058]

[0045] In the case of rapid charging with a 400V station, the capacity module G1 is reactivated by opening the second switch F2, and closing the first switch F1. This can be referred to as activation. Thus, the second branch D2 is connected to the capacity module G1.

[0046] The invention further relates to a computer program such as a control program, for controlling the switches F1 and F2, in the manner described above.

Claims

CLAIMS 1. Motor vehicle with electric traction motor, comprising: - an engine (M); - a converter module (Ml) connected to the motor (M); - a DC box module (MDC) connected to the converter module (Ml); - a battery module (MB) connected to the DC housing module (MDC), comprising an 800V battery (BT); - a high voltage (HV) circuit connecting the converter module (Ml) to the DC housing module (MDC), and to the 800V battery (BT), comprising a negative branch and a positive branch; - a charging connector (CX) receiving a first branch (D1) of the negative branch, and a second branch of a 400V circuit branch (LV) connected to the motor (M), the converter module (Ml) comprising an AC / DC converter connected to a DC connector module (DCL), the AC / DC converter receiving a three-phase alternating current coming from the motor (M) and transmitting it to the 800V battery (BT) via the DC connector module (DCL), then the DC housing module (MDC), characterized in that the DC connector module (DCL) comprises at least a first deactivatable capacity branch (B1), which comprises a capacity module (G1), in that the second branch (D2) of the 400V circuit branch (LV) is connected to said first deactivatable capacity branch (B1), and in that said first deactivatable capacity branch (B1) can take: - either an activated configuration in which the second branch (D2) is connected to the capacity module (G1); - or a deactivated configuration in which the capacity module (G1) is short-circuited and the second branch (D2) is connected to the positive branch at 800V.

2. Motor vehicle according to claim 1, characterized in that the DC connector module (DCL) further comprises a second capacitance branch (B2).

3. Motor vehicle according to claim 2, characterized in that the first capacity branch (B1) and the second capacity branch (B2) are connected to two separate points of the positive branch, and are connected together to the same point of the negative branch.

4. Motor vehicle according to claim 3, characterized in that when the first capacity branch (B1) is in the deactivated configuration, the capacity module (G1) is placed in parallel with the second capacity branch (B2).

5. Motor vehicle according to any one of claims 1 to 4, characterized in that the second branch (D2) comprises a first switch (F1), and the first capacity branch (B1) comprises a second switch (F2).

6. Method for charging a motor vehicle according to any one of claims 1 to 5, comprising the following steps: - in case of charging with a 400V station, an activation step in which the second branch (D2) is connected to the capacity module (G1); and / or - when charging with an 800V station, a deactivation step in which the capacity module (G1) is short-circuited and the second branch (D2) is connected to the positive branch at 800V.

7. A computer program comprising program code instructions for performing the steps of the charging method according to claim 6, when said program is running on a computer.

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