Battery management circuit, vehicle and battery management method

Abstract

The embodiment of the present application provides a battery management circuit, a vehicle and a battery management method. The circuit includes: the two ends of the compressor are respectively connected to the first end of the first battery unit through the front electronic control plug-in of the battery pack, and the second end of the second battery unit is connected to the second end of the second battery unit through the rear electronic control plug-in of the battery pack; the first end of the first relay is connected to the first end of the second battery unit through the rear electronic control plug-in, and the second end of the first relay is connected to the first end of the compressor; the first end of the second relay is connected to the second end of the first battery unit through the rear electronic control plug-in, and the second end of the second relay is connected to the second end of the compressor; the controller is used to control the first relay to close when the first battery unit has thermal runaway, and the second battery unit continues to power the compressor; when the second battery unit has thermal runaway, the second relay is controlled to close, and the first battery unit continues to power the compressor. The circuit is used to ensure the effect of effectively cooling the battery pack.

Description

Technical Field

[0001] The present application relates to the field of battery management technology, and in particular to a battery management circuit, a vehicle, and a battery management method. Background Art

[0002] With the development of new energy, the technical field of new energy vehicles has gradually matured. New energy vehicles usually use battery packs to power the vehicle. In the process of the battery pack powering the vehicle, it is usually necessary to perform thermal management on the batteries in the battery pack to avoid thermal runaway events that cause the battery to fail to supply power normally and continuously.

[0003] In traditional technology, some vehicle architecture thermal management systems use coolant to cool liquid-cooled battery packs. The refrigerant for the direct-cooled battery pack is provided by a compressor, and the compressor is driven by the power battery.

[0004] However, in the implementation process of traditional technology, there is at least a problem that the battery pack cannot be effectively cooled. Summary of the invention

[0005] The embodiments of the present application provide a battery management circuit, a vehicle, and a battery management method to achieve the effect of ensuring effective cooling of the battery pack.

[0006] In a first aspect, an embodiment of the present application provides a battery management circuit, which is applied to a battery pack, wherein the battery pack includes a first battery cell and a second battery cell; the circuit includes:

[0007] A compressor, two ends of the compressor are respectively connected to a first end of a first battery unit through a front electric control plug-in of the battery pack, and connected to a second end of a second battery unit through a rear electric control plug-in of the battery pack;

[0008] a first relay, wherein a first end of the first relay is connected to a first end of the second battery unit through a rear electric control plug-in unit, and a second end of the first relay is connected to a first end of the compressor;

[0009] a second relay, wherein a first end of the second relay is connected to a second end of the first battery unit through a rear electric control plug-in, and a second end of the second relay is connected to a second end of the compressor;

[0010] The controller is used to control the closing of the first relay when the first battery cell has thermal runaway, so that the second battery cell continues to supply power to the compressor through the first relay; and to control the closing of the second relay when the second battery cell has thermal runaway, so that the first battery cell continues to supply power to the compressor through the second relay.

[0011] In a possible implementation, the circuit further includes:

[0012] a first boost module, wherein a first end of the first boost module is connected to a second end of the first relay, and a second end of the first boost module is connected to a first end of the compressor; the first boost module is used to boost the voltage of the second battery cell when thermal runaway occurs in the first battery cell;

[0013] A second boost module, wherein the first end of the second boost module is connected to the second end of the second relay, and the second end of the second boost module is connected to the second end of the compressor; the second boost module is used to boost the voltage of the first battery cell when thermal runaway occurs in the first battery cell.

[0014] In a possible implementation manner, the first relay and the second relay are both boost relays.

[0015] In a possible implementation, the first end of the first relay is connected to the first end of the second relay, and is connected to the second end of the first battery unit and the first end of the second battery unit through the rear electronic control plug-in.

[0016] In a possible implementation, the circuit further includes a third relay;

[0017] The first end of the first relay and the first end of the second relay connected to each other are connected to the first end of the third relay through the rear electric control plug-in;

[0018] A second end of the third relay is connected to the second end of the first battery cell and the first end of the second battery cell respectively.

[0019] In a possible implementation, the circuit further includes:

[0020] A front electric control relay, wherein the first end of the compressor is connected to the first end of the first battery unit via the front electric control relay;

[0021] A rear electronically controlled relay, wherein the second end of the compressor is connected to the second end of the second battery unit via the rear electronically controlled relay.

[0022] In a possible implementation, the circuit further includes:

[0023] A main positive relay, a first end of the main positive relay is connected to a first end of the compressor through a front electronic control plug-in, and a second end of the main positive relay is connected to a first end of the first battery unit;

[0024] A main negative relay, a first end of the main negative relay is connected to a second end of the compressor through a rear electronic control plug-in, and a second end of the main negative relay is connected to a second end of the second battery unit.

[0025] In a possible implementation, the circuit further includes a boost relay and a pre-charging circuit;

[0026] The first end of the boost relay is respectively connected to the first end of the main positive relay and the first end of the pre-charging circuit through the front electric control plug-in, and is connected to the first end of the compressor;

[0027] The second end of the boost relay is respectively connected to the second end of the main positive relay and the second end of the pre-charging circuit, and is connected to the first end of the first battery unit.

[0028] In a second aspect, an embodiment of the present application provides a vehicle, including:

[0029] Vehicle body;

[0030] The battery management circuit as mentioned above is arranged in the vehicle body.

[0031] In a third aspect, an embodiment of the present application provides a battery management method, which is applied to the battery management circuit as described above, and the method includes:

[0032] When thermal runaway occurs in the first battery unit, controlling the first relay to close so that the second battery unit continues to supply power to the compressor through the first relay;

[0033] When thermal runaway occurs in the first battery unit, the second relay is controlled to close, so that the first battery unit continues to supply power to the compressor through the second relay.

[0034] In a possible implementation, the method further includes:

[0035] The operating power of the compressor is adjusted according to the voltage of the first battery unit or the voltage of the second battery unit to enable the compressor to operate normally.

[0036] Compared with conventional technologies, the battery management circuit, vehicle, and battery management method provided in the embodiments of the present application, through the structure of the first relay and the second relay, can keep the other battery cells in use when thermal runaway occurs in one of the battery cells, so that the compressor can continue to work normally, so that the compressor can continuously provide refrigerant to the cold plate of the battery pack, and can effectively cool the batteries in the battery pack that are in thermal runaway. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0038] Figure 1 A schematic diagram of the structure of the vehicle architecture management system provided for this application;

[0039] Figure 2 The structure of the battery management circuit provided in this application is shown in FIG. Figure 1 ;

[0040] Figure 3 The structure of the battery management circuit provided in this application is shown in FIG. Figure 2 ;

[0041] Figure 4 The structure of the battery management circuit provided in this application is shown in FIG. Figure 3 ;

[0042] Figure 5 The structure of the battery management circuit provided in this application is shown in FIG. Figure 4 ;

[0043] Figure 6 A schematic diagram of the battery management method provided in this application;

[0044] Figure 7 A schematic diagram of the structure of the battery management device provided in this application;

[0045] Figure 8 A schematic diagram of the structure of the controller provided in this application.

[0046] Reference numerals:

[0047] 110: battery system; 120: liquid cooling; 130: electronic pump; 140: heat exchanger; 150: expansion kettle; 160: evaporator; 170: compression device; 180: condenser; 190: throttling element; 100: DC cold plate; 210: first battery cell; 220: second battery cell; 230: compressor; 240: first relay; 250: second relay; 260: first boost module; 270: second boost module; 28 0: the third relay; 510: the front electronic control relay; 520: the rear electronic control relay; 530: the main positive relay; 540: the main negative relay; 550: the boost relay; 560: the pre-charge relay; 570: the pre-charge resistor; 580: the fast charge positive relay; 590: the DC charge fuse; 600: the fast charge negative relay; 610: the front electronic control fuse; 620: the voltage divider relay; K1: the front electronic control plug-in; K2: the rear electronic control plug-in; K3: the DC charge plug-in.

[0048] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the present application clearer, exemplary embodiments will be described in detail here, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. The implementation methods described in the following exemplary embodiments do not represent all implementation methods consistent with the present application. On the contrary, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0050] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, system, product or device that includes a series of steps or units is not necessarily limited to those units clearly listed, but may include other steps or units that are not clearly listed or inherent to these products or devices.

[0051] Figure 1 The vehicle architecture management system provided for this application, such as Figure 1 As shown, (a) is a battery management system under a liquid cooling architecture, including a battery system 110, a liquid cooling 120, an electronic pump 130, a heat exchanger 140, an expansion kettle 150, an evaporator 160, a compression device 170, a condenser 180, and a throttling element 190. (b) is a battery management system under a direct cooling architecture, including a battery system 110, a DC cold plate 100, an evaporator 160, a compression device 170, and a condenser 180. When a single cell in the power battery pack undergoes thermal runaway, the vehicle under the liquid cooling architecture can continuously input circulating coolant to the cold plate of the battery pack to cool down the battery pack cells and reduce the severity of the thermal runaway reaction; however, when the battery pack of the direct cooling architecture undergoes thermal runaway, the total positive relay is disconnected, the cell cannot continue to discharge, and the compressor 230 cannot be driven to continue to provide refrigerant to the cold plate of the battery pack, and the battery pack cannot be effectively cooled.

[0052] In combination with the above scenarios, it can be seen that in the traditional technology, there is at least a technical problem of being unable to effectively cool the batteries in the thermal runaway of the battery pack.

[0053] The battery management circuit provided by the present application can keep other battery cells in use when thermal runaway occurs in one battery cell through the related structural settings of the first relay 240 and the second relay 250, so that the compressor 230 can continue to work normally, so that the compressor 230 can continue to provide refrigerant for the cold plate of the battery pack. The technical problem of how to effectively cool the battery in thermal runaway of the battery pack is solved.

[0054] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0055] Figure 2 The structure of the battery management circuit provided in this application is shown in FIG. Figure 1 ,like Figure 2 As shown, the circuit is applied to a battery pack, and the battery pack includes a first battery cell 210 and a second battery cell 220; the circuit includes:

[0056] The compressor 230 has two ends connected to the first end of the first battery unit 210 through the front electronic control plug-in of the battery pack, and a second end connected to the second battery unit 220 through the rear electronic control plug-in of the battery pack.

[0057] The compressor 230 may be a compressor of the vehicle, which may be used to provide cooling air to the cab of the vehicle, and may also provide refrigerant to the battery pack to keep the battery pack at a suitable operating temperature. The front electric control plug-in may be a plug-in of the battery pack of the vehicle for providing current and voltage to the front drive. The rear electric control plug-in may be a plug-in of the battery pack of the vehicle for providing current and voltage to the front drive. Both the front electric control plug-in and the rear electric control plug-in may be arranged on the battery pack.

[0058] Optionally, the first battery cell 210 and the second battery cell 220 may form a series structure in the battery pack, that is, the negative electrode of the first battery cell 210 may be connected to the positive electrode of the second battery cell 220, or the positive electrode of the first battery cell 210 may be connected to the negative electrode of the second battery cell 220. In practical applications, the first end of the first battery cell 210 is the positive electrode and the second end is the negative electrode; the first end of the second battery cell 220 is the positive electrode and the second end is the negative electrode.

[0059] Exemplarily, the second end of the first battery unit 210 is connected to the first end of the second battery unit 220, and the two ends of the compressor 230 can be connected to the first end of the first battery unit 210 through the front electric control plug-in of the battery pack, and connected to the second end of the second battery unit 220 through the rear electric control plug-in of the battery pack, so as to form a loop in which the first battery unit 210 and the second battery unit 220 are connected in series to supply power to the compressor 230. Under normal power supply conditions, the first battery unit 210 and the second battery unit 220 supply power to the compressor 230 at the same time.

[0060] The first relay 240 has a first end connected to a first end of the second battery unit 220 through a rear electric control plug-in, and a second end of the first relay 240 is connected to a first end of the compressor 230 .

[0061] The first relay 240 may be a relay for on-off control between the first end of the second battery unit 220 and the first end of the compressor 230 .

[0062] The second relay 250 has a first end connected to a second end of the first battery unit 210 through the rear electronic control plug-in, and a second end of the second relay 250 is connected to a second end of the compressor 230 .

[0063] The second relay 250 may be a relay for on-off control between the second end of the first battery unit 210 and the second end of the compressor 230 .

[0064] Exemplarily, the first end of the compressor 230 is connected to the first end of the second battery unit 220 through the first relay 240, so as to form a first backup power supply circuit among the second battery unit 220, the first relay 240 and the compressor 230. The second end of the compressor 230 is connected to the second end of the first battery unit 210 through the second relay 250, so as to form a second backup power supply circuit among the first battery unit 210, the second relay 250 and the compressor 230.

[0065] In actual applications, under normal power supply conditions, the first relay 240 and the second relay 250 can be disconnected, that is, the first backup power supply circuit and the second backup power supply circuit are controlled to be disconnected.

[0066] The controller is used to control the first relay 240 to close when the first battery cell 210 has thermal runaway, so that the second battery cell 220 continues to supply power to the compressor 230 through the first relay 240; and to control the second relay 250 to close when the second battery cell 220 has thermal runaway, so that the first battery cell 210 continues to supply power to the compressor 230 through the second relay 250.

[0067] For example, the controller may be connected to the first relay 240 and the second relay 250 respectively, and the controller may be used to control the on-off of the circuit for normally supplying power to the compressor 230. Normal power supply here refers to power supply when the battery pack does not have thermal runaway.

[0068] Specifically, if thermal runaway occurs in the first battery cell 210, the controller can disconnect the first end of the first battery cell 210 and the first end of the compressor 230, and the controller can control the first relay 240 to close so that the above-mentioned first backup power supply circuit is turned on, so that the compressor 230 can be continuously powered by the second battery cell 220 to keep the compressor 230 working normally, so that the compressor 230 can continuously provide refrigerant to the cold plate of the battery pack, thereby effectively cooling the first battery cell 210 that is in thermal runaway.

[0069] If the second battery cell 220 experiences thermal runaway, the controller can disconnect the second end of the second battery cell 220 and the second end of the compressor 230, and the controller can control the second relay 250 to close so that the above-mentioned second backup power supply circuit is turned on, so that the compressor 230 can be continuously powered by the first battery cell 210 to keep the compressor 230 working normally, so that the compressor 230 can continuously provide refrigerant to the cold plate of the battery pack, thereby effectively cooling the second battery cell 220 that is in thermal runaway.

[0070] It can be understood that the above structure provided by this embodiment uses the front electric control plug-in and the rear electric control plug-in to realize the circuit connection between the first battery unit 210, the second battery unit 220 and the compressor 230, and the front electric control plug-in and the rear electric control plug-in can be the battery pack plug-ins corresponding to the front and rear electric controls of the four-wheel drive vehicle. That is, the embodiment provided by this application can be applied to four-wheel drive vehicles.

[0071] Compared with conventional technologies, the battery management circuit provided in this embodiment can, through the above-mentioned structure of the embodiment, keep other battery cells in use when thermal runaway occurs in one of the battery cells, so that the compressor 230 can continue to work normally, so that the compressor 230 can continuously provide refrigerant to the cold plate of the battery pack, and can effectively cool the batteries in the battery pack that are in thermal runaway.

[0072] In an exemplary embodiment, Figure 3 The structure of the battery management circuit provided in this application is shown in FIG. Figure 2 ,like Figure 3 As shown, in this embodiment Figure 2 Based on the embodiment, the battery management circuit is described in detail, and the circuit also includes:

[0073] A first boost module 260, wherein a first end of the first boost module 260 is connected to a second end of the first relay 240, and a second end of the first boost module 260 is connected to a first end of the compressor 230; the first boost module 260 is used to boost the voltage of the second battery unit 220 when thermal runaway occurs in the first battery unit 210;

[0074] The second boost module 270, the first end of the second boost module 270 is connected to the second end of the second relay 250, and the second end of the second boost module 270 is connected to the second end of the compressor 230; the second boost module 270 is used to boost the voltage of the first battery cell 210 when thermal runaway occurs in the first battery cell 210.

[0075] The first boost module 260 may be a module for boosting the voltage of the second battery unit 220 to meet the rated voltage (or starting voltage) of the compressor 230. The second boost module 270 may be a module for boosting the voltage provided by the first battery unit 210 to meet the rated voltage (or starting voltage) of the compressor 230.

[0076] For example, the first relay 240 may be connected to a first end of the compressor 230 via a first boost module 260 ; and the second relay 250 may be connected to a second end of the compressor 230 via a second boost module 270 .

[0077] In actual applications, the first end of the first relay 240 is connected to the first end of the second battery unit 220 through the rear electronic control plug-in, the second end of the first relay 240 is connected to the first end of the first boost module 260, the second end of the first boost module 260 is connected to the first end of the compressor 230, and the second end of the compressor 230 is connected to the second end of the second battery unit 220 through the rear electronic control plug-in, thereby forming a loop in which the second battery unit 220 supplies power to the compressor 230.

[0078] The first end of the second relay 250 is connected to the second end of the first battery unit 210 through the rear electronic control plug-in, the second end of the second relay 250 is connected to the first end of the second boost module 270, the second end of the second boost module 270 is connected to the second end of the compressor 230, and the first end of the compressor 230 is connected to the first end of the first battery unit 210 through the rear electronic control plug-in, thereby forming a loop in which the first battery unit 210 supplies power to the compressor 230.

[0079] Specifically, if the first battery cell 210 experiences thermal runaway, the controller can disconnect the first end of the first battery cell 210 and the first end of the compressor 230, and the controller can control the first relay 240 to close, and the voltage provided by the second battery cell 220 reaches the rated voltage of the compressor 230 after being boosted by the first boost module 260, and the compressor 230 is continuously powered, so that the compressor 230 can continuously provide refrigerant to the cold plate of the battery pack, thereby effectively cooling the first battery cell 210 that is in thermal runaway.

[0080] If the second battery cell 220 experiences thermal runaway, the controller can disconnect the second end of the second battery cell 220 and the second end of the compressor 230, and the controller can control the second relay 250 to close. The voltage provided by the first battery cell 210 reaches the rated voltage of the compressor 230 after being boosted by the second boost module 270, and the compressor 230 is continuously powered, so that the compressor 230 can continuously provide refrigerant to the cold plate of the battery pack, thereby effectively cooling the second battery cell 220 that is in thermal runaway.

[0081] It can be understood that through the above structure, when thermal runaway occurs in the battery, it is possible to ensure that the rated voltage is provided to the compressor 230, maintain the working power of the compressor 230, and cool the battery in thermal runaway, thereby improving the stability of battery pack management.

[0082] Optionally, the first relay 240 and the second relay 250 are both boost relays.

[0083] In practical applications, the above structure does not need to additionally set up the first boost module 260 and the second boost module 270 for boosting. The first relay 240 and the second relay 250 can be directly set as boost relays, and the voltage of the first battery cell 210 and the voltage of the second battery cell 220 can be directly boosted by using the boost relays, so that the voltage input to the compressor 230 meets the rated voltage.

[0084] Optionally, the voltage can be increased to the rated voltage of the compressor 230 when half of the batteries in the battery pack are in thermal runaway by adjusting the transformer coil related circuit in the compressor 230 .

[0085] In this embodiment, by providing a boost relay to directly boost the voltage, the rated power output by the compressor can be maintained and the cost of providing a boost module can be saved.

[0086] In an exemplary embodiment, Figure 4 The structure of the battery management circuit provided in this application is shown in FIG. Figure 3 , Figure 5 The structure of the battery management circuit provided in this application is shown in FIG. Figure 4 ,like Figure 4 or Figure 5 As shown, in this embodiment Figure 2 Based on the embodiment, the battery management circuit is described in detail. The circuit may have the following connection relationship:

[0087] A first end of the first relay 240 is connected to a first end of the second relay 250 , and is connected to a second end of the first battery unit 210 and a first end of the second battery unit 220 through the rear electric control plug-in K2 .

[0088] For example, the first end of the first relay 240 can be connected to the first end of the second relay 250, and the two connected first ends are connected between the second end of the first battery unit 210 and the first end of the second battery unit 220 through the rear electric control plug-in K2. In this way, the first end of the first relay 240 and the first end of the second relay 250 are first connected, and then connected between the second end of the first battery unit 210 and the first end of the second battery unit 220, which can reduce the use of the socket of the rear electric control plug-in K2 and save component space.

[0089] Alternatively, if Figure 4 As shown, the circuit further includes a third relay 280;

[0090] The first end of the first relay 240 and the first end of the second relay 250 are connected to the first end of the third relay 280 through the rear electric control plug-in K2;

[0091] A second end of the third relay 280 is connected to a second end of the first battery unit 210 and a first end of the second battery unit 220 , respectively.

[0092] The third relay 280 may be a relay for controlling the on / off of the backup power supply circuit of the compressor 230 .

[0093] For example, the third relay 280 can be disposed in the battery pack, and after the first end of the first relay 240 and the second relay 250 are connected, the first end of the third relay 280 can be connected through the rear electric control plug-in K2, and the second end of the third relay 280 can be connected between the second end of the first battery unit 210 and the first end of the second battery unit 220. In this way, the third relay 280 can realize the overall on-off control of the circuits where the first relay 240 and the second relay 250 are located.

[0094] Specifically, when neither the first battery unit 210 nor the second battery unit 220 has thermal runaway and the first battery unit 210 and the second battery unit 220 normally supply power to the compressor 230, the controller may control the third relay 280 to be disconnected. When the first battery unit 210 or the second battery unit 220 has thermal runaway, the controller may control the third relay 280 to be closed, so that the battery without thermal runaway continues to supply power to the compressor 230.

[0095] In this embodiment, the setting and structure of the third relay 280 can ensure the correctness of the circuit on and off, so that the battery management circuit can normally and effectively supply power to the compressor 230.

[0096] In an exemplary embodiment, Figure 5 The structure of the battery management circuit provided in this application is shown in FIG. Figure 2 ,like Figure 5 As shown, in this embodiment Figure 2 Based on the embodiment, the battery management circuit is described in detail, and the circuit also includes:

[0097] A front electric control relay 510, a first end of the compressor 230 is connected to a first end of the first battery unit 210 through the front electric control relay 510;

[0098] The rear electronically controlled relay 520 , and the second end of the compressor 230 are connected to the second end of the second battery unit 220 through the rear electronically controlled relay 520 .

[0099] The front electric control relay 510 may be a relay disposed in the front electric control of the vehicle. The rear electric control relay 520 may be a relay disposed in the rear electric control of the vehicle. The first relay 240 and the second relay 250 may also be disposed in the rear electric control.

[0100] For example, the first end of the front electric control relay 510 can be connected to the first end of the compressor 230, and the second end of the front electric control relay 510 can be connected to the first end of the first battery unit 210; the first end of the rear electric control relay 520 can be connected to the second end of the compressor 230, and the second end of the rear electric control relay 520 can be connected to the second end of the second battery unit 220. Through this structure, the compressor 230 is connected to the first battery unit 210 and the second battery unit 220 through the front electric control relay 510 and the rear electric control relay 520, so that the first battery unit 210 and the second battery unit 220 can control the on and off of the power supply circuit of the compressor 230 through the front electric control relay 510 and the rear electric control relay 520.

[0101] Specifically, when neither the first battery unit 210 nor the second battery unit 220 has thermal runaway, the controller can control both the front electric control relay 510 and the rear electric control relay 520 to remain closed. When the first battery unit 210 has thermal runaway, the controller can control the front electric control relay 510 to disconnect, the first battery unit 210 no longer continues to discharge, and the controller controls the rear electric control relay 520 to remain closed, so that the second battery unit 220 continues to supply power to the compressor 230. When the second battery unit 220 has thermal runaway, the controller can control the rear electric control relay 520 to disconnect, the second battery unit 220 no longer continues to discharge, and the controller controls the front electric control relay 510 to remain closed, so that the first battery unit 210 continues to supply power to the compressor 230.

[0102] In this embodiment, the battery management circuit is controlled by the front electronic control relay 510 and the rear electronic control relay 520, which can effectively block the battery with thermal runaway from continuing to discharge, and can keep the battery without thermal runaway from continuing to supply power to the compressor 230, so that the compressor 230 can cool the battery with thermal runaway, thereby ensuring the stability of the battery pack.

[0103] Alternatively, if Figure 5 As shown, the circuit also includes:

[0104] A main positive relay 530, a first end of the main positive relay 530 is connected to a first end of the compressor 230 through the front electronic control plug-in K1, and a second end of the main positive relay 530 is connected to a first end of the first battery unit 210;

[0105] A main negative relay 540 , a first end of the main negative relay 540 is connected to a second end of the compressor 230 through the rear electronic control plug-in K2 , and a second end of the main negative relay 540 is connected to a second end of the second battery unit 220 .

[0106] The main positive relay 530 can be disposed in the battery pack and can be used to control the on / off of the line between the first battery unit 210 and the compressor 230. The main negative relay 540 can be disposed in the battery pack and can be used to control the on / off of the line between the second battery unit 220 and the compressor 230.

[0107] Exemplarily, the main positive relay 530 is disposed in the battery pack, the first end of the main positive relay 530 is connected to the first end of the compressor 230 through the front electric control plug-in K1, and the second end of the main positive relay 530 is connected to the first end of the first battery unit 210. The main negative relay 540 is also disposed in the battery pack, the first end of the main negative relay 540 is connected to the first end of the compressor 230 through the rear electric control plug-in K2, and the second end of the main positive relay 530 is connected to the first end of the first battery unit 210. Through this structure, the compressor 230 can be connected to the first battery unit 210 and the second battery unit 220 through the main positive relay 530 and the main negative relay 540, respectively, so that the first battery unit 210 and the second battery unit 220 can control the on and off of the power supply circuit of the compressor 230 through the main positive relay 530 and the main negative relay 540.

[0108] Specifically, when neither the first battery unit 210 nor the second battery unit 220 has thermal runaway, the controller can control both the main positive relay 530 and the main negative relay 540 to remain closed. When the first battery unit 210 has thermal runaway, the controller can control the main positive relay 530 to disconnect, the first battery unit 210 no longer continues to discharge, and the controller controls the main negative relay 540 to remain closed so that the second battery unit 220 continues to supply power to the compressor 230. When the second battery unit 220 has thermal runaway, the controller can control the main negative relay 540 to disconnect, the second battery unit 220 no longer continues to discharge, and the controller controls the main positive relay 530 to remain closed so that the first battery unit 210 continues to supply power to the compressor 230.

[0109] In this embodiment, the battery management circuit is controlled by the main positive relay 530 and the main negative relay 540 arranged in the battery pack, which can effectively block the battery with thermal runaway from continuing to discharge, and can keep the battery without thermal runaway to continue to supply power to the compressor 230, so that the compressor 230 can cool the battery with thermal runaway, thereby ensuring the stability of the battery pack.

[0110] Alternatively, if Figure 5 As shown, the circuit also includes a boost relay 550 and a pre-charge circuit;

[0111] The first end of the boost relay 550 is respectively connected to the first end of the main positive relay 530 and the first end of the pre-charging circuit through the front electric control plug-in K1, and is connected to the first end of the compressor 230;

[0112] The second end of the boost relay 550 is respectively connected to the second end of the main positive relay 530 and the second end of the pre-charging circuit, and is connected to the first end of the first battery unit 210 .

[0113] The boost relay 550 may be used to boost the voltage provided by the battery of the battery pack. The pre-charging circuit may include a pre-charging relay 560 and a pre-charging resistor 570 .

[0114] Exemplarily, the two ends of the boost relay 550 are respectively connected to the two ends of the boost relay 550, and the first end of the boost relay 550 can be the first end of the main positive relay 530 through the front electric control plug-in K1. The two ends of the pre-charge circuit are also respectively connected to the two ends of the boost relay 550, and the first end of the pre-charge circuit can be the first end of the main positive relay 530 connected through the front electric control plug-in K1. It can be understood that the front electric control plug-in K1 can be a multi-core plug-in.

[0115] The pre-charging resistor 570 of the pre-charging circuit is respectively connected to the first end of the boost relay 550 and the first end of the main positive relay 530, the second end of the pre-charging resistor 570 is connected to the first end of the pre-charging relay 560, and the first end of the pre-charging relay 560 is respectively connected to the second end of the boost relay 550 and the second end of the main positive relay 530.

[0116] In practical applications, the battery voltage of the battery pack can be boosted by the boost relay 550 to meet the compressed rated voltage requirement, and the voltage between the battery pack and the compressor 230 can be balanced by the pre-charging circuit, thereby ensuring the stability of the voltage provided by the battery pack.

[0117] In an exemplary embodiment, Figure 5 The structure of the battery management circuit provided in this application is shown in FIG. Figure 4 ,like Figure 5 As shown, the battery management circuit is described in detail, and the circuit includes:

[0118] The negative electrode of the first battery unit 210 is connected to the positive electrode of the second battery unit 220 through the voltage divider relay 620. The first end of the compressor 230 is connected to the front electric control plug-in K1 of the battery pack through the front electric control relay 510, and the second end of the compressor 230 is connected to the rear electric control plug-in K2 of the battery pack through the rear electric control relay 520.

[0119] The first end of the first relay 240 is connected to the first end of the second relay 250, and is connected to the first end of the third relay 280 through the rear electric control plug-in K2. The second end of the third relay 280 is respectively connected to the second end of the first battery unit 210 and the first end of the second battery unit 220. The second end of the first relay 240 is connected to the first end of the compressor 230, and the second end of the second relay 250 is connected to the second end of the compressor 230.

[0120] The battery pack further includes: a first end of the main positive relay 530 is connected to the front electric control plug-in K1, a first end of the boost relay 550 is connected to the front electric control plug-in K1, a first end of the pre-charge resistor 570 is connected to the front electric control plug-in K1, and a second end of the pre-charge resistor 570 is connected to the first end of the pre-charge relay 560; the second end of the main positive relay 530, the second end of the boost relay 550 and the second end of the pre-charge relay 560 are connected and connected to the positive electrode of the first battery unit 210 through the HVCU of the battery pack. The first end of the main negative relay 540 is connected to the rear electric control plug-in K2 through the HVSU of the battery pack.

[0121] The battery pack also includes a DC charging plug-in K3, a first end of the fast charging positive relay 580 is connected to the DC charging plug-in K3, a second end of the fast charging positive relay 580 is connected to a first end of a DC charging fuse 590, and a second end of the DC charging fuse 590 is connected to a first end of the main positive relay 530. A first end of the fast charging negative relay 600 is connected to the DC charging plug-in K3, and a second end of the fast charging negative relay 600 is connected to a first end of the main negative relay 540 and to the rear electric control plug-in K2 through the HVSU. The front electric control plug-in K1 and the rear electric control plug-in K2 can be connected through the front electric control fuse 610.

[0122] Specifically, when a cell in the cell stack of the first battery unit 210 experiences thermal runaway, the main positive relay 530 is disconnected (at this time, the boost relay 550 and the pre-charge relay 560 are both in the disconnected state), the cells in the upper half cannot continue to discharge, and the cells in the second battery unit 220 in the lower half are discharged through the rear electric control connector, the rear electric control relay 520 is closed, the first relay 240 is closed, and the second relay 250 is disconnected, driving the compressor 230 to work. When a cell in the cell stack of the second battery unit 220 experiences thermal runaway, the main negative relay 540 is disconnected, and the cells in the first battery unit 210 in the upper half are discharged through the main positive circuit and the front electric control connector, the front electric control relay 510 is closed, the rear electric control relay 520 is disconnected, the first relay 240 is disconnected, and the second relay 250 is closed, driving the compressor 230 to work.

[0123] In this embodiment, an additional circuit is added to the battery pack distribution box to partition the battery pack. When a single battery cell on one side experiences thermal runaway, the vehicle receives a thermal runaway alarm signal from the battery pack and transmits the information to the battery pack BMS. The battery cells on the other side continue to supply power to the compressor through the relay of the newly added additional circuit, the power plug-in of the whole pack (front and rear electronic control plug-in), and the relay switch, so as to keep the compressor working normally or increase the power, so that the refrigerant circulates to cool the battery pack cells. When the above thermal event occurs, half of the batteries will not continue to discharge, which means that the voltage output by the whole pack through the dual electronic control connector will be halved. At this time, the transformer coil in the first relay or the second relay is adjusted through the relevant transformer circuit to pull the voltage up to the rated voltage (or starting voltage) of the compressor to keep the compressor working normally, thereby effectively cooling the battery pack.

[0124] In an exemplary embodiment, the present application provides a vehicle, comprising:

[0125] Vehicle body;

[0126] The battery management circuit as mentioned above is arranged in the vehicle body.

[0127] Optionally, the vehicle may be an electric car, and a battery management circuit as described above is provided on the vehicle body to provide the vehicle with various required electrical energies.

[0128] In practical applications, by providing a vehicle with the above-mentioned battery management circuit, the battery pack of the vehicle can be effectively cooled to ensure the normal use of the vehicle.

[0129] In an exemplary embodiment, Figure 6 A flow chart of the battery management method provided in this application, such as Figure 6 As shown, the method is applied to the battery management circuit as described above, and the method includes:

[0130] S601, when thermal runaway occurs in the first battery unit, controlling the first relay to close so that the second battery unit continues to supply power to the compressor through the first relay;

[0131] S602: When thermal runaway occurs in the first battery unit, control the second relay to close, so that the first battery unit continues to supply power to the compressor through the second relay.

[0132] Exemplarily, if thermal runaway occurs in the first battery cell, the controller can disconnect the connection between the first end of the first battery cell and the first end of the compressor, and the controller can control the first relay to close to conduct the above-mentioned first backup power supply circuit, so that the compressor can be continuously powered by the second battery cell to keep the compressor working normally, so that the compressor can continuously provide refrigerant to the cold plate of the battery pack, thereby effectively cooling the first battery cell that has thermal runaway.

[0133] If thermal runaway occurs in the second battery cell, the controller can disconnect the second end of the second battery cell and the second end of the compressor, and the controller can control the second relay to close to conduct the second backup power supply circuit. In this way, the compressor can be continuously powered by the first battery cell to keep the compressor working normally, so that the compressor can continuously provide refrigerant to the cold plate of the battery pack and effectively cool the second battery cell that is in thermal runaway.

[0134] In practical applications, through the above method, when half of the batteries are in thermal runaway, the compressor can be continuously powered by the other half of the batteries, so that the compressor can provide refrigerant to cool the battery pack in thermal runaway, thereby improving the effectiveness of cooling the battery pack.

[0135] Alternatively, if Figure 6 As shown, the method also includes:

[0136] S603, adjusting the operating power of the compressor according to the voltage of the first battery unit or the voltage of the second battery unit to enable the compressor to operate normally.

[0137] For example, when thermal runaway occurs in the first battery cell, the operating power of the compressor can be adjusted according to the voltage of the second battery cell to reduce the voltage required for the compressor to operate. When thermal runaway occurs in the second battery cell, the operating power of the compressor can be adjusted according to the voltage of the first battery cell to reduce the voltage required for the compressor to operate.

[0138] In practical applications, the above method can reduce the number of boost modules to be set or the number of compressor circuit adjustments to be made, thereby reducing the cost of circuit settings while ensuring the normal operation of the compressor.

[0139] Figure 7 A schematic diagram of the structure of the battery management device provided in this application, such as Figure 7 As shown, the battery management device 70 provided in this embodiment includes:

[0140] The first relay control module 701 is used to control the first relay to close when thermal runaway occurs in the first battery unit, so that the second battery unit continues to supply power to the compressor through the first relay.

[0141] The second relay control module 702 is used to control the second relay to close when thermal runaway occurs in the first battery unit, so that the first battery unit continues to supply power to the compressor through the second relay.

[0142] In a possible implementation, the device further includes a power adjustment module. The power adjustment module is used to adjust the operating power of the compressor according to the voltage of the first battery unit or the voltage of the second battery unit to enable the compressor to operate normally.

[0143] The battery management device provided in this embodiment can execute the method provided in the above method embodiment, and its implementation principle and technical effect are similar, which will not be described in detail in this embodiment.

[0144] Figure 8 This is a schematic diagram of the structure of the controller provided in this application. Figure 8 As shown, the electronic device 80 provided in this embodiment includes: at least one processor 801 and a memory 802. Optionally, the device 80 also includes a communication component 803. The processor 801, the memory 802 and the communication component 803 are connected via a bus 804.

[0145] In a specific implementation process, at least one processor 801 executes the computer-executable instructions stored in the memory 802, so that at least one processor 801 executes the above method.

[0146] The specific implementation process of the processor 801 can be found in the above method embodiment, and its implementation principle and technical effect are similar, so this embodiment will not be repeated here.

[0147] In the above embodiments, it should be understood that the processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), etc. A general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the invention can be directly implemented as a hardware processor, or can be implemented by a combination of hardware and software modules in the processor.

[0148] The memory may include a high-speed memory (Random Access Memory, RAM), and may also include a non-volatile memory (NVM), such as at least one disk storage.

[0149] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the bus in the drawings of this application is not limited to only one bus or one type of bus.

[0150] The present application also provides a computer program product, including a computer program, which implements the above method when executed by a processor.

[0151] The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the above method is implemented.

[0152] The above-mentioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general or special-purpose computer.

[0153] An exemplary readable storage medium is coupled to a processor so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (Application Specific Integrated Circuits, referred to as: ASIC). Of course, the processor and the readable storage medium can also exist in the device as discrete components.

[0154] The division of units is only a logical function division, and there may be other divisions in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0155] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0156] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0157] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0158] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, disk or optical disk and other media that can store program codes.

[0159] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A battery management circuit, characterized in that: Applied to a battery pack, the battery pack comprising a first battery unit (210) and a second battery unit (220); the circuit comprising: A compressor (230), wherein two ends of the compressor (230) are respectively connected to a first end of the first battery unit (210) via a front electric control plug-in of the battery pack, and connected to a second end of the second battery unit (220) via a rear electric control plug-in of the battery pack; a first relay (240), wherein a first end of the first relay (240) is connected to a first end of the second battery unit (220) via the rear electric control plug-in unit, and a second end of the first relay (240) is connected to a first end of the compressor (230); a second relay (250), wherein a first end of the second relay (250) is connected to a second end of the first battery unit (210) via the rear electric control plug-in, and a second end of the second relay (250) is connected to a second end of the compressor (230); A controller, the controller being used for controlling the first relay (240) to close when the first battery unit (210) experiences thermal runaway, so that the second battery unit (220) continues to supply power to the compressor (230) through the first relay (240); and controlling the second relay (250) to close when the second battery unit (220) experiences thermal runaway, so that the first battery unit (210) continues to supply power to the compressor (230) through the second relay (250); The circuit further comprises a main positive relay (530), a main negative relay (540), a boost relay (550), a pre-charging circuit, a fast charging positive relay (580), a DC charging fuse (590), a fast charging negative relay (600) and a front electric control fuse (610); The first end of the main positive relay (530) is connected to the first end of the compressor (230) through the front electronic control plug-in unit, and the second end of the main positive relay (530) is connected to the first end of the first battery unit (210); The first end of the main negative relay (540) is connected to the second end of the compressor (230) through the rear electronic control plug-in unit, and the second end of the main negative relay (540) is connected to the second end of the second battery unit (220); The first end of the boost relay (550) is respectively connected to the first end of the main positive relay (530) and the first end of the pre-charging circuit through the front electronic control plug-in, and is connected to the first end of the compressor (230); The second end of the boost relay (550) is respectively connected to the second end of the main positive relay (530) and the second end of the pre-charging circuit, and is connected to the first end of the first battery unit (210); The first end of the fast-charging positive relay (580) is connected to the DC charging plug-in of the battery pack, the second end of the fast-charging positive relay (580) is connected to the first end of the DC charging fuse (590), the second end of the DC charging fuse (590) is connected to the first end of the main positive relay (530), the first end of the fast-charging negative relay (600) is connected to the DC charging plug-in, the second end of the fast-charging negative relay (600) is connected to the first end of the main negative relay (540) and to the rear electric control plug-in, and the front electric control plug-in and the rear electric control plug-in are connected via the front electric control fuse (610).

2. The battery management circuit according to claim 1, characterized in that: The circuit further comprises: a first boost module (260), wherein a first end of the first boost module (260) is connected to a second end of the first relay (240), and a second end of the first boost module (260) is connected to a first end of the compressor (230); the first boost module (260) is used to boost the voltage of the second battery unit (220) when thermal runaway occurs in the first battery unit (210); A second boost module (270), wherein a first end of the second boost module (270) is connected to a second end of the second relay (250), and a second end of the second boost module (270) is connected to a second end of the compressor (230); the second boost module (270) is used to boost the voltage of the first battery unit (210) when thermal runaway occurs in the first battery unit (210).

3. The battery management circuit according to claim 1, characterized in that: The first relay (240) and the second relay (250) are both boost relays (550).

4. The battery management circuit according to claim 1, characterized in that: The first end of the first relay (240) is connected to the first end of the second relay (250), and is connected to the second end of the first battery unit (210) and the first end of the second battery unit (220) through the rear electric control plug-in.

5. The battery management circuit according to claim 4, characterized in that: The circuit also includes a third relay (280); The first end of the connected first relay (240) and the first end of the second relay (250) are connected to the first end of the third relay (280) through the rear electric control plug-in; The second end of the third relay (280) is respectively connected to the second end of the first battery unit (210) and the first end of the second battery unit (220).

6. The battery management circuit according to claim 1, characterized in that: The circuit further comprises: A front electric control relay (510), wherein a first end of the compressor (230) is connected to a first end of the first battery unit (210) via the front electric control relay (510); A rear electric control relay (520), wherein the second end of the compressor (230) is connected to the second end of the second battery unit (220) via the rear electric control relay (520).

7. A vehicle, characterized in that: include: Vehicle body; The battery management circuit according to any one of claims 1 to 6 is arranged in the vehicle body.

8. A battery management method, characterized in that: Applied to the battery management circuit according to any one of claims 1 to 6, the method comprising: When thermal runaway occurs in the first battery unit, controlling the first relay to close so that the second battery unit continues to supply power to the compressor through the first relay; When thermal runaway occurs in the first battery unit, the second relay is controlled to close, so that the first battery unit continues to supply power to the compressor through the second relay.

9. The battery management method according to claim 8, characterized in that: The method further comprises: The operating power of the compressor is adjusted according to the voltage of the first battery unit or the voltage of the second battery unit to enable the compressor to operate normally.

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