Battery control device, method for an electric vehicle, electric vehicle

Abstract

The present disclosure provides a battery control device, method and electric vehicle for the electric vehicle. The battery control device comprises a battery module, two charging circuits connected with the battery module, each charging circuit comprising a charging relay and a pair of charging ports connected in series, and a control module configured to: during the process that a first charging gun charges the battery module through the charging port of one charging circuit, when detecting that a second charging gun is connected with the charging port of the other charging circuit, first make the requested charging current of the battery module be 0, and then make the first charging gun and the second charging gun charge the battery module. The present disclosure can realize the single-gun charging function and the double-gun charging function, and can protect the performance of the relay during the switching from the single-gun charging mode to the double-gun charging mode.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of electric vehicles, and in particular to a battery control device, a method and an electric vehicle for electric vehicles. BACKGROUND

[0002] The battery control device of an electric vehicle may need to control the battery to achieve different functions in different situations, such as different forms of charging and / or discharging, which puts higher requirements on the compatibility of the battery control device. When charging the battery of an electric vehicle, there is a single-gun charging mode of charging the battery through one charging gun and a double-gun charging mode of charging the battery through two charging guns.

[0003] However, in the process of switching from the single-gun charging mode to the double-gun charging mode, if the related relays are directly operated, it is possible to cause the relays to be operated under load, thereby damaging the performance of the relays and causing safety problems. SUMMARY

[0004] One of the technical problems to be solved by the present disclosure is how to protect the performance of the relays in the process of switching from the single-gun charging mode to the double-gun charging mode.

[0005] To solve the above technical problems, the present disclosure provides a battery control device for an electric vehicle, comprising: a battery module; two charging circuits connected with the battery module, each charging circuit comprising a charging relay and a pair of charging ports connected in series with each other; and a control module, the control module being configured to: in the process of charging the battery module through one charging port of one charging circuit by a first charging gun, when detecting that a second charging gun is connected with the charging port of the other charging circuit, first making the requested charging current of the battery module be 0, and then charging the battery module by the first charging gun and the second charging gun.

[0006] In some embodiments, the control module is configured to: in the process of charging the battery module by the first charging gun and the second charging gun, when it is needed to switch to charging the battery module only by the second charging gun, first making the requested charging current of the battery module be 0, and then charging the battery module by the second charging gun.

[0007] In some embodiments, the control module is configured to: in response to the handshake of the charging ports of the two charging circuits with the first charging gun and the second charging gun being successful respectively, close the charging relays of the two charging circuits.

[0008] In some embodiments, at least one discharging circuit connected with the battery module is further included, each of the discharging circuits comprising a control circuit and a pair of discharging ports connected in series with each other; wherein the control circuit comprises a first branch and a second branch connected in parallel, the first branch comprising a discharging relay, and the second branch comprising a pre-charging relay and a pre-charging resistor connected in series with each other; and the control module is configured to, in the case that the pre-charging function of the all-in-one controller of the electric vehicle is damaged, first close the pre-charging relay for pre-charging when the battery module needs to be discharged, and then close the discharging relay and open the pre-charging relay after the pre-charging is completed.

[0009] In some embodiments, the control module is configured to, in the case that the pre-charging function of the all-in-one controller is normal, directly close the discharging relay when the battery module needs to be discharged.

[0010] In some embodiments, the battery module comprises a plurality of battery branches connected in parallel, each of the battery branches comprising a battery and a branch relay connected in series with each other; and the control module is configured to, when the battery module needs to be discharged, detect the output voltage of each of the battery branches, and control the branch relay corresponding to a certain battery branch to be opened when the output voltage of the certain battery branch is 0, and / or control the branch relays corresponding to certain two battery branches to be opened when the difference between the output voltages of the certain two battery branches is greater than a predetermined value, or control only the branch relay corresponding to the battery branch with the smaller output voltage among the certain two battery branches to be opened.

[0011] In some embodiments, the control module is configured to, when the battery module does not need to be discharged, open the branch relay on each of the battery branches.

[0012] In some embodiments, a battery heating circuit connected with the battery module is further included, the battery heating circuit comprising a battery heating component and a heating relay connected in series with each other; and the control module is configured to, in the case that the battery module is in a charging state or a discharging state, close the heating relay when a battery heating condition is met.

[0013] In some embodiments, a DC / DC circuit connected with the battery module is further included, the DC / DC circuit comprising a DC / DC control circuit and a DC / DC interface connected in series with each other; wherein the DC / DC control circuit comprises a first DC / DC control branch and a second DC / DC control branch connected in parallel, the first DC / DC control branch comprising a DC / DC relay, and the second DC / DC control branch comprising a DC / DC pre-charging relay and a DC / DC pre-charging resistor connected in series with each other.

[0014] The embodiments of the present disclosure further provide an electric vehicle comprising the battery control device according to any one of the above embodiments.

[0015] The battery control method for the electric vehicle also includes: when detecting that a second charging gun is connected to a charging port of another charging circuit during the process that a first charging gun charges the battery module through a charging port of one charging circuit, first making the requested charging current of the battery module 0, and then charging the battery module by the first charging gun and the second charging gun.

[0016] In some embodiments, the method further includes: when detecting that the connection between the first charging gun and the corresponding charging port is disconnected during the process that the first charging gun and the second charging gun charge the battery module simultaneously, first making the requested charging current of the battery module 0, and then charging the battery module by the second charging gun.

[0017] In some embodiments, the method further includes: when the battery module needs to be discharged in the case that the pre-charge function of the all-in-one controller of the electric vehicle is damaged, first closing the pre-charge relay to pre-charge, and then closing the discharge relay and disconnecting the pre-charge relay after the pre-charge is completed.

[0018] In some embodiments, the method further includes: when the battery module needs to be discharged, detecting the output voltage of each battery branch; and when the output voltage of a certain battery branch is 0, controlling the branch relay corresponding to the certain battery branch to be disconnected; and / or when the difference between the output voltages of two certain battery branches is greater than a predetermined value, controlling all the branch relays corresponding to the two certain battery branches to be disconnected, or only controlling the branch relay corresponding to the battery branch with the smaller output voltage among the two certain battery branches to be disconnected.

[0019] Through the above technical solutions, the battery control device provided by the present disclosure can realize the single-gun charging function and the double-gun charging function, and can protect the performance of the relay during the process of switching from the single-gun charging mode to the double-gun charging mode, so that the function switching can be smoothly performed. The present disclosure can also detect and independently control the multi-branch battery, thereby reducing energy loss. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, brief descriptions will be given below for the drawings needed to be used in the embodiments or prior art descriptions. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0021] Figure 1 is a partial circuit diagram of the battery control device shown in the example embodiment of the present disclosure;

[0022] Figure 2 is a general circuit diagram of the battery control device shown in the example embodiment of the present disclosure;

[0023] Figure 3 is another partial circuit diagram of the battery control device shown in the example embodiment of the present disclosure;

[0024] Figure 4 is another partial circuit diagram of the battery control device shown in the example embodiment of the present disclosure;

[0025] Figure 5 is another partial circuit diagram of the battery control device shown in the example embodiment of the present disclosure;

[0026] Figure 6 is a flowchart of the battery control method shown in the example embodiment of the present disclosure;

[0027] Figure 7 is another flowchart of the battery control method shown in the example embodiment of the present disclosure;

[0028] Figure 8 is another flowchart of the battery control method shown in the example embodiment of the present disclosure;

[0029] Figure 9 is another flowchart of the battery control method shown in the example embodiment of the present disclosure.

[0030] Explanation of Reference Signs:

[0031] 10, battery module; 12, battery branch; 122, battery; 124, branch relay; 100, battery control device; 20, charging circuit; 22, charging port; 24, charging relay; 30, first charging gun; 32, second charging gun; 40, discharging circuit; 42, discharging port; 44, control circuit; 46, first branch; 48, second branch; 50, battery heating component; 52, battery heating circuit; 54, heating relay; 60, DC / DC interface; 62, DC / DC circuit; 64, DC / DC control circuit; 66, first DC / DC control branch; 68, second DC / DC control branch; K1, discharging relay; K2, pre-charging relay; K3, charging 1 positive relay; K4, charging 2 positive relay; K5, heating positive relay; K6, heating negative relay; K7, main negative relay; K8, charging 2 negative relay; K9, charging 1 negative relay; K10, TMS relay; K11, DC / DC relay; K12, DC / DC pre-charging relay; K13, branch 1 relay; K14, branch 2 relay; R1, pre-charging resistor; R2, DC / DC pre-charging resistor; F1, heating fuse; F2, DC / DC fuse; F3, TMS fuse; C, current sensor; U1, battery branch 1 output voltage; U2, battery branch 2 output voltage. DETAILED DESCRIPTION

[0032] The embodiments of the present disclosure will be described in further detail below with reference to the drawings and examples. The following detailed description of the examples and the accompanying drawings are provided for the purpose of illustrating the principles of the present disclosure, and are not intended to limit the scope of the present disclosure, which can be embodied in a variety of different forms, not limited to the specific examples disclosed herein, but include all technical solutions falling within the scope of the claims.

[0033] The present disclosure provides these examples in order to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specified, the relative arrangement of components and steps, the composition of materials, numerical expressions and values set forth in these examples should be interpreted as merely exemplary, and not as a limitation.

[0034] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "a plurality of" is greater than or equal to two; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like is only for the purpose of facilitating the description of the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the present disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] In addition, "first", "second", and similar words used in the present disclosure do not indicate any order, number, or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error. "Include" or "contain" and similar words mean that the elements before the word cover the elements listed after the word, and do not exclude the possibility of also covering other elements.

[0036] It should also be noted that, in the description of the present disclosure, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be interpreted broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances. When it is described that a specific device is located between a first device and a second device, there can be an intermediate device between the specific device and the first device or the second device, or there can be no intermediate device.

[0037] All terms used herein are intended to have the same meaning as understood by one of ordinary skill in the art to which this disclosure belongs unless otherwise specifically defined herein. It will also be appreciated that terms, such as those defined in commonly- used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0038] Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as part of the description.

[0039] Figure 1 is a partial circuit diagram of a battery control device 100 according to an example embodiment of the present disclosure, with reference to Figure 1 The battery control device 100 includes a battery module 10, two charging circuits 20 connected to the battery module 10, each of the charging circuits 20 including a charging relay 24 and a pair of charging ports 22 connected in series with each other, and a control module configured to, during charging of the battery module 10 by a first charging gun 30 through a charging port 22 of one of the charging circuits 20, first cause a requested charging current of the battery module 10 to be 0 when detecting that a second charging gun 32 is connected to a charging port 22 of the other of the charging circuits 20, and then perform charging of the battery module 10 by the first charging gun 30 and the second charging gun 32.

[0040] The control module enables or disables the corresponding charging circuit 20 by controlling the closing or opening of the charging relay 24. After any pair of charging ports 22 is connected to and matched with the first charging gun 30 or the second charging gun 32, the corresponding charging circuit 20 is enabled by closing the corresponding charging relay 24 to enable charging of the battery module 10. After the connection between any pair of charging ports 22 and the first charging gun 30 or the second charging gun 32 is disconnected, the corresponding charging relay 24 needs to be opened.

[0041] The inventors of the present disclosure realized that, during switching from a single-gun charging mode to a double-gun charging mode, if the charging relay 24 is directly closed, it is possible to cause the charging relay 24 to be closed with load, which in turn damages the performance of the charging relay 24 and causes safety problems.

[0042] Specifically, in the process of charging the battery module 10 by the first charging gun 30 through the first pair of charging ports (charging 1 positive, charging 1 negative), when the second charging gun 32 is connected with the second pair of charging ports (charging 2 positive, charging 2 negative), if the power of single-gun charging and double-gun charging is different (for example, the charging power is different for the case of setting a single charging gun for a single charging pile and setting two charging guns for a single charging pile), it will cause the current of the charging circuit 20 where the first pair of charging ports (for example: charging 1 positive, charging 1 negative) is distributed to the charging circuit 20 where the second pair of charging ports (for example: charging 2 positive, charging 2 negative) is located, and if the charging relay of the charging circuit 20 where the second pair of charging ports (charging 2 positive, charging 2 negative) is directly closed, it will cause the charging relay to be closed under load, which is easy to cause damage to the charging relay.

[0043] In the technical solution of the present disclosure, the requested charging current of the battery module 10 is first set to 0, and then the first charging gun 30 and the second charging gun 32 charge the battery module 10, which can well avoid the problem of closing the charging relay under load, and make the function switching proceed smoothly and safely. After the requested charging current of the battery module 10 is set to 0, the communication handshake between the first charging gun 30, the second charging gun 32 and the corresponding charging port 22 can be re-performed, and then double-gun charging is performed after the handshake is successful. In some embodiments, the control module is configured to close the charging relays 24 of the two charging circuits 20 in response to the fact that the charging ports 22 of the two charging circuits 20 have successfully handshake with the first charging gun 30 and the second charging gun 32 respectively.

[0044] In some embodiments, the control module is configured to, in the process of charging the battery module 10 by the first charging gun 30 and the second charging gun 32 simultaneously, when it is necessary to switch to charging the battery module 10 by only the second charging gun 32, first set the requested charging current of the battery module 10 to 0, and then charge the battery module 10 by the second charging gun 32.

[0045] In the process of charging the battery module 10 by the first charging gun 30 and the second charging gun 32 simultaneously, when one of the branches is detected to be faulty and it is necessary to switch to single-gun charging mode, if the charging relay on the charging circuit 20 is directly opened, it will cause the charging relay to be opened under load, which is easy to cause damage to the charging relay. In the technical solution of the present disclosure, the requested charging current of the battery module 10 is first set to 0, and then the second charging gun 32 charges the battery module 10, which can well avoid the problem of opening the charging relay under load. After the requested charging current of the battery module 10 is set to 0, the communication handshake between the second charging gun 32 and the corresponding charging port 22 can be re-performed, and then single-gun charging is performed after the handshake is successful.

[0046] Reference Figure 1Each charging circuit 20 can include two charging relays, which are respectively arranged between the positive electrode of the battery module 10 and the charging positive port included in the pair of charging ports and between the negative electrode of the battery module 10 and the charging negative port included in the pair of charging ports. For example, referring to Figure 1 The charging 1 positive relay K3 can be arranged between the positive electrode of the battery module 10 and the charging 1 positive, and the charging 1 negative relay K9 can be arranged between the negative electrode of the battery module 10 and the charging 1 negative. The charging 2 positive relay K4 can be arranged between the positive electrode of the battery module 10 and the charging 2 positive, and the charging 2 negative relay K8 can be arranged between the negative electrode of the battery module 10 and the charging 2 negative. The two charging circuits 20 are independently controlled, and single-gun charging or double-gun charging can be conveniently performed.

[0047] Figure 2 is a general circuit diagram of the battery control device 100 shown in the example embodiments of the present disclosure, Figure 3 is another partial circuit diagram of the battery control device 100 shown in the example embodiments of the present disclosure. In combination with Figure 2 and Figure 3 In some embodiments, the battery control device 100 further includes at least one discharging circuit 40 connected with the battery module 10, each discharging circuit 40 including a control circuit 44 and a pair of discharging ports 42 connected in series with each other; wherein the control circuit 44 includes a first branch 46 and a second branch 48 connected in parallel, the first branch 46 including a discharging relay K1, and the second branch 48 including a pre-charging relay K2 and a pre-charging resistor R1 connected in series with each other; the control module is configured to, in the case that the pre-charging function of the multi-in-one controller of the electric vehicle is damaged, first close the pre-charging relay K2 for pre-charging when the battery module 10 needs to be discharged, and then close the discharging relay K1 and open the pre-charging relay K2 after the pre-charging is completed.

[0048] In some embodiments, the control module is configured to, in the case that the pre-charging function of the multi-in-one controller is normal, directly close the discharging relay K1 when the battery module 10 needs to be discharged, without the need to first close the pre-charging relay K2 for pre-charging.

[0049] In the technical solution of the present disclosure, the second branch 48 and the corresponding control logic are provided, so that the battery control device 100 has good adaptability. When the battery control device 100 is arranged on an electric vehicle without the pre-charging function of the all-in-one controller, the pre-charging function provided by the second branch 48 can be used. In this case, when the battery module 10 needs to be discharged, the pre-charging relay K2 needs to be closed first for pre-charging, and after the pre-charging is completed, the discharge relay K1 is closed and the pre-charging relay K2 is disconnected. When the battery control device 100 is arranged on an electric vehicle with the pre-charging function of the all-in-one controller, it is determined whether the pre-charging relay K2 needs to be closed first for pre-charging according to whether the pre-charging function of the all-in-one controller is intact. Through such a setting, on the one hand, additional pre-charging protection can be provided when the pre-charging function of the all-in-one controller is damaged, and on the other hand, repeated pre-charging protection can be avoided when the pre-charging function of the all-in-one controller is normal.

[0050] In some embodiments, the damage of the pre-charging function of the all-in-one controller can include that the main positive relay in the all-in-one controller is stuck or the pre-charging relay is damaged. In the case of damage of the pre-charging function of the all-in-one controller, it can be necessary to discharge the battery module 10 in an emergency state to realize, for example, the driving of the electric vehicle, and at this time, by closing the pre-charging relay K2 first for pre-charging, then closing the discharge relay K1 and disconnecting the pre-charging relay K2, the electric vehicle can be made to limp.

[0051] In some embodiments, the number of discharge circuits 40 is multiple and parallel to each other, and the battery control device 100 provides multiple pairs of discharge ports 42, so that multiple branch discharges can be realized, further expanding the function of the battery control device 100, and the control circuit 44 can be a common part of the multiple discharge circuits 40, which uniformly controls the multiple discharge circuits 40. Referring to Figure 3 , the discharge relay K1 can be a main positive relay, connected between the positive electrode of the battery module 10 and the discharge positive ports (discharge 1 positive, discharge 2 positive) of the multiple pairs of discharge ports 42; the discharge circuit 40 is also provided with a main negative relay K7, which is arranged between the negative electrode of the battery module 10 and the discharge negative ports (discharge 1 negative, discharge 2 negative) of the multiple pairs of discharge ports 42.

[0052] Referring to Figure 1 In some embodiments, the battery module 10 includes multiple battery branches 12 in parallel, and each battery branch 12 includes batteries 122 and branch relays 124 connected in series with each other. By providing multiple battery branches 12, single-branch input / output or multi-branch input / output can be realized, and in the case of failure of one of the battery branches 12, other battery branches 12 can be used to improve the stability of the battery control device 100.

[0053] In some embodiments, the control module is configured to: when the battery module 10 needs to be discharged, detect the output voltage of each battery branch 12; and when the output voltage of a certain battery branch 12 is 0, control the branch relay 124 corresponding to the certain battery branch 12 to be disconnected. The output voltage can be the voltage detected at a position on the battery branch 12 between the battery 122 and the branch relay 124. In some embodiments, a manual service switch (MSD) is arranged on the battery branch 12 to facilitate maintenance. It is referred to Figure 1 Before the discharge circuit works, the control module detects the output voltage U1 of the battery branch 1 and the output voltage U2 of the battery branch 2 respectively, and when U1 is 0, it is considered that MSD1 is faulty, and when U2 is 0, it is considered that MSD2 is faulty. At this time, according to the needs, the branch 1 relay K13 and the branch 2 relay K14 are controlled to select to disable all branches to work or to select a normal single branch to work.

[0054] In some embodiments, the control module is configured to: when the difference between the output voltages of two battery branches 12 is greater than a predetermined value, control the branch relays 124 corresponding to the two battery branches 12 to be disconnected, or only control the branch relay 124 corresponding to the battery branch 12 with the smaller output voltage among the two battery branches 12 to be disconnected, and make the branch relay 124 corresponding to the other battery branch 12 with the larger output voltage to be closed. It is referred to Figure 1 When the difference between U1 and U2 is greater than a predetermined value, it is considered that the voltage difference between the two branches is too large. At this time, according to the needs, K13 and K14 are controlled to select to disable all branches to work or to select a single branch with a larger total voltage to work, so as to avoid closing K13 and K14 when the voltage difference is large, causing the instantaneous current to be too large and damaging system components.

[0055] In some embodiments, the control module is configured to: when the battery module 10 does not need to be discharged, disconnect the branch relay 124 on each battery branch 12, so as to avoid forming a discharge loop between different battery branches 12 and causing energy loss.

[0056] It is referred to Figure 2 , Figure 4 and Figure 5 In some embodiments, the battery control device 100 further comprises a battery heating circuit 52 connected with the battery module 10, the battery heating circuit 52 comprising a battery heating component 50 and a heating relay 54 connected in series with each other; and the control module is configured to: when the battery module 10 is in a charging state or a discharging state, and when a battery heating condition is met, the heating relay 54 is closed.

[0057] The heating relay 54 can include a heating positive relay K5 arranged between the positive electrode of the battery module 10 and the heating relay 54, and a heating negative relay K6 arranged between the negative electrode of the battery module 10 and the heating relay 54. A heating fuse F1 can be arranged between the positive electrode of the battery module 10 and the heating positive relay K5. The battery heating condition can include a battery temperature threshold, a battery power, an ambient temperature, etc.

[0058] Reference Figure 2 In some embodiments, the battery control device 100 further includes a DC / DC circuit 62 connected with the battery module 10, the DC / DC circuit 62 including a DC / DC control circuit 64 and a DC / DC interface 60 connected in series with each other; the DC / DC control circuit 64 including a first DC / DC control branch 66 and a second DC / DC control branch 68 connected in parallel with each other, the first DC / DC control branch 66 including a DC / DC relay K11, and the second DC / DC control branch 68 including a DC / DC pre-charge relay K12 and a DC / DC pre-charge resistor R2 connected in series with each other. The control module is configured to: when the DC / DC function needs to be implemented, first close the DC / DC pre-charge relay K12 for pre-charging, and then close the DC / DC relay K11 and open the DC / DC pre-charge relay K12 after the pre-charging is completed. In some embodiments, when the DC / DC has a pre-charge function, the battery control device 100 can not be provided with the DC / DC pre-charge relay K12 and the DC / DC pre-charge resistor R2, and the control module does not set the control logic related to the DC / DC pre-charge relay K12.

[0059] Reference Figure 2 In some embodiments, the battery control device 100 further includes a battery TMS refrigeration circuit and a battery TMS (thermal management system), a TMS relay K10, and a TMS fuse F3 arranged on the battery TMS refrigeration circuit. The battery module 10 is arranged on the battery TMS refrigeration circuit, and the TMS relay K10 and the TMS fuse F3 are arranged between the battery module 10 and the battery TMS. The control module is configured to: when the battery cooling condition is met, the TMS relay K10 is closed to implement the cooling function of the battery module 10, in the case that the battery module 10 is in a charging state or a discharging state.

[0060] Reference Figure 2 In some embodiments, the control module can be a BMS (battery management system), and the battery control device 100 further includes a communication input port, a communication output port, a vehicle communication port, and a debugging port connected with the BMS. The communication input port and the communication output port are respectively connected with an external battery communication port to realize the communication between the master BMS and the slave BMS.

[0061] The present disclosure also provides an electric vehicle comprising the battery control device 100 according to any one of the above embodiments.

[0062] Figure 6 is a flowchart of the battery control method shown in the example embodiments of the present disclosure, in combination with Figure 1 and Figure 6 The battery control method comprises: during the process of charging the battery module 10 by the first charging gun 30 through the charging port 22 of one charging circuit 20, when detecting that the second charging gun 32 is connected to the charging port 22 of another charging circuit 20, first making the requested charging current of the battery module 10 be 0, and then charging the battery module 10 by the first charging gun 30 and the second charging gun 32.

[0063] In some embodiments, the battery control method further comprises: during the process of charging the battery module 10 by the first charging gun 30 and the second charging gun 32 at the same time, when it is needed to switch to charge the battery module 10 only by the second charging gun 32, first making the requested charging current of the battery module 10 be 0, and then charging the battery module 10 by the second charging gun 32.

[0064] Referring to Figure 3 and Figure 7 In some embodiments, the battery control method further comprises: in the case that the pre-charge function of the all-in-one controller of the electric vehicle is damaged, when it is needed to discharge the battery module 10, first closing the pre-charge relay K2 to pre-charge, and then closing the discharge relay K1 and opening the pre-charge relay K2 after the pre-charge is completed. When the pre-charge function in the all-in-one controller of the vehicle is damaged, if the vehicle needs to be powered on in an emergency state, after receiving the instruction, first close the main negative relay K7, then close the pre-charge relay K2 to pre-charge, close the discharge relay K1 after the pre-charge is completed, and open the pre-charge relay K2, to realize the limp-home function of the vehicle, while protecting the discharge relay K1 and the main negative relay K7.

[0065] In some embodiments, the battery control method further comprises: when it is needed to discharge the battery module 10, detecting the output voltage of each battery branch 12; and when the output voltage of a certain battery branch 12 is 0, controlling the branch relay 124 corresponding to the certain battery branch 12 to be opened; and / or when the difference between the output voltages of two certain battery branches 12 is greater than a predetermined value, controlling the branch relays 124 corresponding to the two certain battery branches 12 to be opened, or, only controlling the branch relay 124 corresponding to the battery branch 12 with the smaller output voltage among the two certain battery branches 12 to be opened.

[0066] Referring to Figure 8In some embodiments, when charging is needed, the control module (for example, the BMS) determines the charging circuit by detecting the external charging connection signal. For example, when the charging circuit 1 is connected, the charging 1 positive relay K3 and the charging 1 negative relay K9 are closed to realize the charging function of the battery module by the charging circuit 1; when the charging circuit 2 is connected, the charging 2 positive relay K4 and the charging 2 negative relay K8 are closed to realize the charging function of the battery module by the charging circuit 2; when the charging circuit 1 and the charging circuit 2 work at the same time, the double-gun charging function is realized.

[0067] Reference Figure 9 In some embodiments, when discharging is needed, the main negative relay K7 is first closed, then the pre-charge relay K2 is closed for pre-charge, the discharge relay K1 is closed after pre-charge is completed, and then the pre-charge relay K2 is disconnected. At this time, the battery module 10 provides high voltage for the whole vehicle to realize the discharging function. When the main positive relay and the pre-charge function are included in the whole-vehicle multi-in-one controller, the pre-charge circuit in the battery control device 100 can be functionally extended. Specifically, in the normal state, the pre-charge relay K2 does not need to be closed for pre-charge, and the discharge relay K1 and the main negative relay K7 are directly closed after receiving the power-on instruction of the whole-vehicle multi-in-one.

[0068] No matter in the charging state or the discharging state, when the battery needs to be heated, the heating positive relay K5 and the heating negative relay K6 are closed to realize the heating function of the battery. No matter in the charging state or the discharging state, when the battery needs to be refrigerated, the TMS relay K10 is closed to realize the refrigeration function of the battery, so that the TMS enters different working modes according to the thermal management strategy. When the whole-vehicle DC / DC needs to work, the DC / DC pre-charge relay K12 is closed to complete the pre-charge of the DC / DC, then the DC / DC relay K11 is closed, and then the DC / DC pre-charge relay K12 is disconnected to realize the power supply function of the DC / DC.

[0069] In summary, the battery control device of the present disclosure has improved expandability and compatibility. Through the multiple embodiments of the present disclosure, the following technical effects can be achieved:

[0070] 1. The same battery control device can be compatible with the functional requirements of single branch and double branch;

[0071] 2. When the pre-charge function of the whole-vehicle multi-in-one controller is damaged, additional pre-charge function can be provided to realize the limp-home of the vehicle in an emergency;

[0072] 3. Compatible with single-pile single-gun charging mode and single-pile double-gun charging mode, when the two charging modes are switched during charging, the charging relay is protected to avoid load switching;

[0073] 4. Eliminate the energy loss of the internal loop discharge of the multi-branch battery structure, and report when the branch voltage difference is abnormal.

[0074] So far, the embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein according to the above description.

[0075] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A battery control device (100) for an electric vehicle, characterized in that, Comprising: a battery module (10); two charging circuits (20) connected with the battery module (10), each of the charging circuits (20) comprising a charging relay (24) and a pair of charging ports (22) connected in series with each other; and a control module configured to: in a process that a first charging gun (30) charges the battery module (10) through the charging port (22) of one of the charging circuits (20), when detecting that a second charging gun (32) is connected with the charging port (22) of another of the charging circuits (20), first making the requested charging current of the battery module (10) be 0, and then closing the corresponding charging relay (24) to charge the battery module (10) by the first charging gun (30) and the second charging gun (32); the control module is configured to: in a process that the first charging gun (30) and the second charging gun (32) charge the battery module (10) at the same time, when needing to switch to charge the battery module (10) only by the second charging gun (32), first making the requested charging current of the battery module (10) be 0, and then opening the corresponding charging relay (24) to charge the battery module (10) by the second charging gun (32).

2. The apparatus of claim 1, wherein, the control module is configured to: in response to that the charging ports (22) of the two charging circuits (20) successfully handshake with the first charging gun (30) and the second charging gun (32) respectively, close the charging relays (24) of the two charging circuits (20).

3. The apparatus of claim 1, wherein, Further comprising at least one discharging circuit (40) connected with the battery module (10), each of the discharging circuits (40) comprising a control circuit (44) and a pair of discharging ports (42) connected in series with each other; wherein the control circuit (44) comprises a first branch (46) and a second branch (48) connected in parallel, the first branch (46) comprises a discharging relay (K1), and the second branch (48) comprises a pre-charging relay (K2) and a pre-charging resistor (R1) connected in series with each other; the control module is configured to: in a case that the pre-charging function of the multi-in-one controller of the electric vehicle is damaged, when needing to discharge the battery module (10), first close the pre-charging relay (K2) to pre-charge, and then close the discharging relay (K1) and open the pre-charging relay (K2) after pre-charging is completed.

4. The apparatus of claim 3, wherein, the control module is configured to: in a case that the pre-charging function of the multi-in-one controller is normal, when needing to discharge the battery module (10), directly close the discharging relay (K1).

5. The apparatus of claim 1, wherein, the battery module (10) comprises a plurality of battery branches (12) connected in parallel, each of the battery branches (12) comprising a battery (122) and a branch relay (124) connected in series with each other; the control module is configured to: when needing to discharge the battery module (10), detect the output voltage of each of the battery branches (12); and When the output voltage of a certain battery branch (12) is 0, the branch relay (124) corresponding to the certain battery branch (12) is controlled to be turned off; and / or When the difference between the output voltages of two certain battery branches (12) is greater than a predetermined value, the branch relays (124) corresponding to the two certain battery branches (12) are controlled to be turned off, or only the branch relay (124) corresponding to the battery branch (12) with the smaller output voltage among the two certain battery branches (12) is controlled to be turned off.

6. The apparatus of claim 5, wherein, The control module is configured to: When the battery module (10) does not need to be discharged, the branch relay (124) on each battery branch (12) is turned off.

7. The apparatus of claim 1, wherein, Further comprising a battery heating circuit (52) connected to the battery module (10), the battery heating circuit (52) comprising a battery heating component (50) and a heating relay (54) connected in series with each other; Wherein, the control module is configured to: when the battery module (10) is in a charging state or a discharging state, and when a battery heating condition is met, the heating relay (54) is closed; and / or The device (100) further comprises a DC / DC circuit (62) connected to the battery module (10), the DC / DC circuit (62) comprising a DC / DC control circuit (64) and a DC / DC interface (60) connected in series with each other; Wherein, the DC / DC control circuit (64) comprises a first DC / DC control branch (66) and a second DC / DC control branch (68) connected in parallel, the first DC / DC control branch (66) comprises a DC / DC relay (K11), and the second DC / DC control branch (68) comprises a DC / DC pre-charge relay (K12) and a DC / DC pre-charge resistor (R2) connected in series with each other.

8. An electric vehicle characterized by comprising: The battery control device (100) according to any one of claims 1-7.

9. A battery control method for an electric vehicle, characterized by, Comprise: During the process that the first charging gun (30) charges the battery module (10) through the charging port (22) of one charging circuit (20), when it is detected that the second charging gun (32) is connected to the charging port (22) of another charging circuit (20), the requested charging current of the battery module (10) is first set to 0, and then the corresponding charging relay (24) is closed to charge the battery module (10) by the first charging gun (30) and the second charging gun (32). The method further comprises: During the process that the first charging gun (30) and the second charging gun (32) charge the battery module (10) at the same time, when it is detected that the connection between the first charging gun (30) and the corresponding charging port (22) is disconnected, the requested charging current of the battery module (10) is first set to 0, and then the corresponding charging relay (24) is turned off to charge the battery module (10) by the second charging gun (32).

10. The method of claim 9, wherein, The method further comprises: In the case that the pre-charge function of the all-in-one controller of the electric vehicle is damaged, when the battery module (10) needs to be discharged, first close the pre-charge relay (K2) for pre-charge, after the pre-charge is completed, then close the discharge relay (K1) and disconnect the pre-charge relay (K2); and / or The method further comprises: When the battery module (10) needs to be discharged, detecting the output voltage of each battery branch (12); and When the output voltage of a certain battery branch (12) is 0, controlling the branch relay (124) corresponding to the certain battery branch (12) to be disconnected; and / or When the difference between the output voltages of two certain battery branches (12) is greater than a predetermined value, controlling the branch relays (124) corresponding to the two certain battery branches (12) to be disconnected, or, only controlling the branch relay (124) corresponding to the battery branch (12) with the smaller output voltage among the two certain battery branches (12) to be disconnected.

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