Method and device for charging a high-voltage battery, vehicle comprising the device

Abstract

Method and device (113) for charging a high-voltage battery (100), wherein the device (113) is designed to charge the high-voltage battery (100) selectively with a first voltage (103), in particular 400 volts, and a second voltage (104), in particular 800 volts, wherein the device (113) comprises a half-bridge (114) which is designed to conduct current for charging a first battery bank (101) of the high-voltage battery (100) and a second battery bank (102) of the high-voltage battery (100) with the first voltage (103) alternately into the first battery bank (101) and the second battery bank (102), or to conduct no current for jointly charging the first battery bank (101) and the second battery bank (102) with the second voltage (104), wherein the half-bridge (114) has a connection (117) for a center tap at which the first Battery bank (101) and the second battery bank (102) are permanently connected in series.Vehicle comprising the device (113).

Description

The invention relates to a device for charging a high-voltage battery and to a vehicle comprising the device.In order to achieve high powers during driving and charging, on-board power supply systems with voltages of 800 volts and more are increasingly being used.In some markets, the availability of an 800 volt charging infrastructure is limited, or not present at all. Therefore, a charging option with 400 volts is often necessary, at least with little power as an emergency charging option.DE 10 2017 123 458 A1 discloses a method and a system for autonomously interconnecting at least two battery banks in a drive system of a motor vehicle in the vehicle's power grid, in which the at least two battery banks can be switched over to form a high-voltage battery. This system can also switch to a state of charge between two banks, which are either connected in parallel or connected in series. In this case, a circuit can also be implemented in such a way that the two banks function as high-voltage batteries for 800 V operation, in comparison with a 400 V operation.The device according to claim 1 enables a charging possibility with 400 volts, which is as light and optionally favorable as possible.The device for charging a high-voltage battery is designed to charge the high-voltage battery selectively with a first voltage, in particular 400 volts, and a second voltage, in particular 800 volts, wherein the device comprises a half bridge which is designed to conduct current for charging a first battery bank of the high-voltage battery and a second battery bank of the high-voltage battery with the first voltage alternately into the first battery bank and the second battery bank, or to conduct no current for jointly charging the first battery bank and the second battery bank with the second voltage, wherein the half bridge has a connection for a center tap at which the first battery bank and the second battery bank are permanently connected in series.The device comprises, for example, a common contact for the first voltage and the second voltage.The device preferably comprises a diode arranged between the half bridge and the high-voltage battery, wherein the diode is configured to block a current flow from the high-voltage battery to the half bridge when charging the high-voltage battery with the first voltage and when charging the high-voltage battery with the second voltage.The device comprises, in one example, a common switch for the first voltage and the second voltage, wherein the switch is arranged between the contact and the half bridge, wherein the switch is configured to close or disconnect an electrical connection between the half bridge and the contact.The device comprises, in one example, a switch for the first voltage and a switch for the second voltage, wherein the switch for the first voltage is arranged between the contact and the half bridge and is configured to establish or disconnect an electrical connection between the half bridge and the contact, and wherein the switch for the second voltage is arranged between the contact and the high-voltage battery and is configured to establish or disconnect an electrical connection between the high-voltage battery and the contact.It can be provided that the diode is arranged between the half bridge and the contact, wherein the diode is configured to allow a current flow from the contact to the high-voltage battery when charging the high-voltage battery with the first voltage, and to block a current flow from the contact to the half bridge when charging the high-voltage battery with the second voltage.The half bridge comprises, for example, two parallel circuits of a respective switch with a respective diode, wherein the diodes are arranged in the reverse direction between a first terminal and a second terminal of the half bridge, wherein the half bridge has a third terminal between the diodes, and wherein high-voltage battery is connected to the third terminal between the first battery bank and the second battery bank.The third terminal and the high voltage battery are connected via a shunt, for example.A vehicle may be provided that comprises the device.A method for charging a high-voltage battery provides that a first voltage, in particular 400 volts, or a second voltage, in particular 800 volts, is detected for charging, wherein a half bridge is provided which is designed to alternately conduct current into the first battery bank and the second battery bank with the first voltage for charging a first battery bank of the high-voltage battery and a second battery bank of the high-voltage battery, wherein the half bridge has a connection for a center tap at which the first battery bank and the second battery bank are permanently connected in series, wherein the half bridge is designed to conduct no current for jointly charging the first battery bank and the second battery bank with the second voltage, wherein the half bridge is driven when the first voltage is detected, Current to be conducted through the connection for the center tap alternately into the first battery bank and the second battery bank, and wherein the half bridge is actuated, when the second voltage is detected, to conduct no current for jointly charging the first battery bank and the second battery bank with the second voltage.Further advantageous embodiments can be seen from the following description and the drawing. The drawing shows: FIG. 1 is a schematic diagram of an apparatus for charging a high voltage battery according to a first example. FIG. 2 is a schematic diagram of an apparatus for charging a high voltage battery according to a second example.In FIG. 1, a high-voltage battery 100 having a first battery bank 101 and a second battery bank 102 is schematically illustrated. The first battery bank 101 is configured to provide a first voltage, in the example 400 volts. The second battery bank 102 is configured to provide the first voltage. The first battery bank 101 and the second battery bank 102 are permanently connected in series at a center tap. For example, the first battery bank 101 and the second battery bank 102 are connected via a copper rail.The high-voltage battery 100 is configured to provide a second voltage 104, in the example 800 volts.The high voltage battery 100 is chargeable with either the first voltage 103 or the second voltage 104 via a first contact 105 and a second contact 106.In FIG. 1, a charging column 107 is schematically shown. The charging column 107 is configured to selectively provide either the first voltage 103 or the second voltage 104 between the first contact 105 and the second contact 106.The first battery bank 101 comprises a positive pole 108 and a negative pole 109. The second battery bank 102 includes a positive pole 110 and a negative pole 111.In FIG. 1, a device 113 for charging the high-voltage battery 100 according to a first example is schematically illustrated.The device 113 comprises a half bridge 114 having a first terminal 115, a second terminal 116 and a third terminal 117. The half bridge 114 comprises a first parallel circuit 118 of a first switch 119 and a first diode 120. The half bridge 114 comprises a second parallel circuit 121 of a second switch 122 and a second diode 123. The first diode 120 and the second diode 123 are arranged between the first terminal 115 and the second terminal 116 in the reverse direction of the first diode 120 and the second diode 123, and connect the first terminal 115 and the second terminal 116. The third terminal 117 is connected to the first diode 120 and the second diode 123 between the first diode 120 and the second diode 123. The third terminal 117 is connected via a shunt 124 to the negative pole 109 of the first battery bank 101 and to the positive pole 110 of the second battery bank 102.The device 113 comprises a third diode 125 which is arranged between the positive contact 108 of the first battery bank 101 and a first terminal 115 of the half bridge 114 in the reverse direction of the third diode 125 and connects the positive contact 108 of the first battery bank 101 and the first terminal 115 of the half bridge 114.The device 113 comprises a fourth diode 126 which is arranged between the negative contact 111 of the second battery bank 102 and a second terminal 116 of the half bridge 114 in the forward direction of the fourth diode 126 and connects the negative contact 111 of the second battery bank 102 and the second terminal 116 of the half bridge 114.In the example, the first contact 105 is connected to the first terminal 115 of the half bridge 114. The second contact 106 is connected to the second terminal 116 of the half bridge 114 in the example.The device 113 is designed to control the half bridge 114 for charging the high-voltage battery 100 with the first voltage 103 in order to conduct the current either on a first path 1 into the first battery bank 101 or on a second path 2 into the second battery bank 102. For example, the device 113 is designed to alternately conduct the current into the first battery bank 101 and into the second battery bank 102.For example, the device 113 is designed to monitor a charge level of the first battery bank 101 and of the second battery bank 102. For example, the device 113 is designed to alternately conduct the current at time intervals into the first battery bank 101 and into the second battery bank 102, by means of which the charge level of the first battery bank 101 is kept equal to or substantially equal to the charge level of the second battery bank 102.Device 113 is designed to control half bridge 114 for charging high-voltage battery 100 with second voltage 104 in order to conduct the current via a third path 3 into first battery bank 101 and second battery bank 102.In the example, the device 113 comprises a third switch 127 which is arranged between the first contact 105 and both the first terminal 115 and the third diode 125. The third switch 127 is configured to selectively establish or disconnect the electrical connection between the first contact 105 and both the first terminal 115 and the third diode 125.The device 113 comprises, in the example, a fourth switch 128 arranged between the second contact 106 and both the second terminal 116 and the fourth diode 126. The fourth switch 128 is configured to selectively establish or disconnect the electrical connection between the second contact 106 and both the second terminal 116 and the fourth diode 126.The third switch 127 and the fourth switch 128 are designed as contactors for the first voltage 103 and the second voltage 104 in the example.In FIG. 2, a device 113 for charging the high-voltage battery 100 according to a second example is schematically illustrated.The device 113 according to the second example is configured like the device 113 according to the first example.The device 113 according to the second example additionally comprises a fifth switch 129 arranged in an additional electrical connection between the first contact 105 and the positive pole 108 of the first battery bank 101. The fifth switch 129 is configured to selectively establish or disconnect the electrical connection between the first contact 105 and the positive pole 108 of the first battery bank 101.The device 113 according to the second example additionally comprises a sixth switch 130 arranged in an additional electrical connection between the second contact 106 and the negative pole 111 of the second battery bank 102. The sixth switch 130 is configured to selectively establish or disconnect the electrical connection between the second contact 106 and the negative pole 111 of the second battery bank 102.The third switch 127 and the fourth switch 128 can be embodied as contactors for the first voltage 103. The fifth switch 129 and the sixth switch 130 are designed as contactors for the second voltage 104 in the example.The device 113 is configured to control the switches such that simultaneously or substantially simultaneously the third switch 127 and the fourth switch 128 are closed and the fifth switch 129 and the sixth switch 130 are open.The device 113 is configured to control the switches such that simultaneously or substantially simultaneously the third switch 127 and the fourth switch 128 are opened and the fifth switch 129 and the sixth switch 130 are closed.The device 113 comprises, for example, an electrical circuit, in particular a microcontroller, which is designed to detect the voltage between the first contact 105 and the second contact 106 and to drive the half bridge 114 and the switches for the described charging according to the detected voltage.A method for charging the high-voltage battery 100 provides that the voltage between the first contact 105 and the second contact 106 is detected and the half bridge 114 and the switches for the described charging are driven according to the detected voltage.The method provides that, when the first voltage 103 is detected, the half bridge 114 is controlled to alternately conduct current through the connection 117 for the center tap into the first battery bank 101 and the second battery bank 102.The method provides that, when the second voltage 104 is detected, the half bridge 114 is controlled not to conduct any current for jointly charging the first battery bank 101 and the second battery bank 102 with the second voltage 104.References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 10 2017 123 458 A1

[0004]

Claims

Device (113) for charging a high-voltage battery (100), characterized in that the device (113) is designed to selectively charge the high-voltage battery (100) with a first voltage (103), in particular 400 volts, and a second voltage (104), in particular 800 volts, wherein the device (113) comprises a half bridge (114), which is designed to alternately conduct current for charging a first battery bank (101) of the high-voltage battery (100) and a second battery bank (102) of the high-voltage battery (100) with the first voltage (103) into the first battery bank (101) and the second battery bank (102), or for jointly charging the first battery bank (101) and the second battery bank (102) with the second voltage (104), or to not conduct current, wherein the half bridge (114) has a connection (117) for a center tap at which the first battery bank (101) and the second battery bank (102) are permanently connected in series.Device (113) according to claim 1, characterised in that the device (113) comprises a common contact (105) for the first voltage (103) and the second voltage (104)Device (113) according to Claim 1 or 2, characterized in that the device (113) comprises a diode (125) which is arranged between the half bridge (14) and the high-voltage battery (100), wherein the diode (125) is designed to block a current flow from the high-voltage battery (100) to the half bridge (114) when charging the high-voltage battery (100) with the first voltage (103) and when charging the high-voltage battery with the second voltage (104).Device (113) according to one of Claims 1 to 3, characterized in that the device (113) comprises a common switch (127) for the first voltage (103) and the second voltage (104), wherein the switch (127) is arranged between the contact (105) and the half bridge (114), wherein the switch (127) is designed to close or disconnect an electrical connection between the half bridge (114) and the contact (105).Device (113) according to one of Claims 1 to 3, characterized in that the device (113) comprises a switch (127) for the first voltage (103) and a switch (129) for the second voltage (104), wherein the switch (127) for the first voltage (103) is arranged between the contact (105) and the half bridge (114) and is designed to establish or disconnect an electrical connection between the half bridge (114) and the contact (105), and wherein the switch (129) for the second voltage (104) is arranged between the contact (105) and the high-voltage battery (100) and is designed to establish or disconnect an electrical connection between the high-voltage battery (100) and the contact (105).Device (113) according to Claim 5, characterized in that the diode (125) is arranged between the half bridge (114) and the contact (105), wherein the diode (125) is designed to allow a current flow from the contact (105) to the high-voltage battery (100) when the high-voltage battery (100) is charged with the first voltage (103), and to block a current flow from the contact (105) to the half bridge (114) when the high-voltage battery (100) is charged with the second voltage (104).Device (113) according to one of the preceding claims, characterized in that the half bridge comprises two parallel circuits (118, 121) of a respective switch (119, 122) each having a respective diode (120, 123), wherein the diodes (120, 123) are arranged in the reverse direction between a first terminal (115) and a second terminal (116) of the half bridge (114), wherein the half bridge (114) has a third terminal (117) between the diodes (120, 123), and wherein high-voltage battery (100) is connected to the third terminal (117) between the first battery bank (101) and the second battery bank (102).Device (113) according to claim 7, characterised in that the third connection (117) and the high-voltage battery (100) are connected via a shunt (124).Vehicle, characterized in that the vehicle comprises the device according to one of claims 1 to 8.Method for charging a high-voltage battery (100), characterized in that a first voltage (103), in particular 400 volts, or a second voltage (104), in particular 800 volts, is detected for charging, wherein a half bridge (114) is provided, which is designed to alternately conduct current for charging a first battery bank (101) of the high-voltage battery (100) and a second battery bank (102) of the high-voltage battery (100) with the first voltage (103) into the first battery bank (101) and the second battery bank (102), wherein the half bridge (114) has a connection (117) for a center tap at which the first battery bank (101) and the second battery bank (102) are permanently connected in series, wherein the half bridge (114) is designed, for jointly charging the first battery bank (101) and the second battery bank (102) with the second voltage (104), no current to be conducted, wherein the half bridge (114) is driven when the first voltage (103) is detected to conduct current through the connection (117) for the center tap alternately into the first battery bank (101) and the second battery bank (102), and wherein the half bridge (114) is driven when the second voltage (104) is detected to not conduct current for jointly charging the first battery bank (101) and the second battery bank (102) with the second voltage (104).

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