Battery system
By setting multiple sets of switch modules in the battery system and using different signal ports for control, the problems of single control method and poor reliability are solved, multiple control methods and high reliability are achieved, functional safety level is met, the structure of the battery system is simplified and the cost is reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG COSMX BATTERY CO LTD
- Filing Date
- 2025-03-31
- Publication Date
- 2026-06-16
Smart Images
Figure CN224367555U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of circuit technology, specifically to a battery system. Background Technology
[0002] In battery systems, the charging and discharging process is typically controlled by a control circuit. This circuit usually includes a switch, and the charging and discharging process is controlled by the closing of the switch. However, current battery system control circuits suffer from limitations such as limited control methods and poor reliability. Utility Model Content
[0003] In view of this, embodiments of this application provide a battery system that can provide a variety of possible control methods for the battery system, thereby improving the safety and functionality of the battery system.
[0004] An embodiment of this application provides a battery system, including: an energy storage module, including a first electrode and a second electrode with opposite polarities, wherein the battery system further includes a first output terminal and a second output terminal, the second electrode and the second output terminal being electrically connected; multiple sets of switch modules, the multiple sets of switch modules being connected in parallel, one end of each set of switch modules being electrically connected to the first electrode, and the other end of each set of switch modules being electrically connected to the first output terminal, each set of switch modules including at least one switch module, each of the at least one switch module including a first switch element and a second switch element connected in series; and a control module, used to acquire at least one of the voltage of the first electrode and the voltage of the first output terminal, and to acquire the voltage at the connection point between the first switch element and the second switch element in the switch module, the control module including multiple first signal ports and multiple second signal ports. Multiple sets of first switching elements in the multiple switch modules are electrically connected to multiple first signal ports, and multiple sets of second switching elements in the multiple switch modules are electrically connected to multiple second signal ports. When any one of the multiple first signal ports sends a first control signal, the set of first switching elements connected to the first signal port is in a closed state; when the first signal port sends a second control signal, the set of first switching elements connected to the first signal port is in an open state. When any one of the multiple second signal ports sends a third control signal, the set of second switching elements connected to the second signal port is in a closed state; when the second signal port sends a fourth control signal, the set of second switching elements connected to the second signal port is in an open state.
[0005] According to one embodiment of this application, the multiple switch modules include two switch modules, the multiple first signal ports include two first signal ports, the multiple second signal ports include two second signal ports, the two sets of first switch elements in the two switch modules are electrically connected to the two first signal ports respectively, and the two sets of second switch elements in the two switch modules are electrically connected to the two second signal ports respectively.
[0006] According to one embodiment of this application, the two sets of switch modules include a first set of switch modules and a second set of switch modules, wherein the number of switch modules in the first set of switch modules is greater than the number of switch modules in the second set of switch modules.
[0007] According to one embodiment of this application, the number of switch modules in the first group of switch modules is 2, and the number of switch modules in the second group of switch modules is 1.
[0008] According to one embodiment of this application, each of the multiple switch modules includes one switch module, and the number of multiple switch modules is greater than or equal to 3.
[0009] According to one embodiment of this application, the first electrode is the positive electrode of the energy storage module, the first switching element includes a charging metal-oxide-semiconductor field-effect transistor (MOSFET), and the second switching element includes a discharging MOSFET. In the switching module, the charging MOSFET is located between the discharging MOSFET and the positive electrode of the energy storage module, and the drain of the charging MOSFET is connected to the drain of the discharging MOSFET.
[0010] According to one embodiment of this application, the first electrode is the positive electrode of the energy storage module, the first switching element includes a charging metal-oxide-semiconductor field-effect transistor (MOSFET), and the second switching element includes a discharge MOSFET. In the switching module, the discharge MOSFET is located between the charging MOSFET and the positive electrode of the energy storage module, and the source of the charging MOSFET is connected to the source of the discharge MOSFET.
[0011] According to one embodiment of this application, the first electrode is the negative electrode of the energy storage module, the first switching element includes a charging metal-oxide-semiconductor field-effect transistor (MOSFET), and the second switching element includes a discharge MOSFET. In the switching module, the discharge MOSFET is located between the charging MOSFET and the negative electrode of the energy storage module, and the drain of the charging MOSFET is connected to the drain of the discharge MOSFET.
[0012] According to one embodiment of this application, the first electrode is the negative electrode of the energy storage module, the first switching element includes a charging metal-oxide-semiconductor field-effect transistor (MOSFET), and the second switching element includes a discharging MOSFET. In the switching module, the charging MOSFET is located between the discharging MOSFET and the negative electrode of the energy storage module, and the source of the charging MOSFET is connected to the source of the discharging MOSFET.
[0013] According to one embodiment of this application, the control module includes: a microcontroller for acquiring at least one of the voltage of the first electrode and the voltage of the first output terminal, and for acquiring the voltage of the connection point between the first switching element and the second switching element in the switching module; and a driver electrically connected to the microcontroller, the driver including a plurality of first signal ports and a plurality of second signal ports.
[0014] This application provides a battery system that, by setting up multiple sets of switch modules, allows different sets of first switching elements to be controlled using different first signal ports, and different sets of second switching elements to be controlled using different second signal ports. This ensures that if one signal port (first signal port / second signal port) fails, the other signal ports can be used to maintain normal circuit operation, guaranteeing normal control of the charging or discharging process. This provides multiple possible control methods for the battery system, improving its safety and functionality. Furthermore, by setting first and second switching elements in series within a single switch module, bidirectional independent control can be achieved. By detecting the voltage across the switch module and the common terminal voltage, short-circuit or open-circuit faults in the switching elements can be determined. Attached Figure Description
[0015] Figure 1 The diagram shown is a schematic diagram of the structure of a battery system provided in an exemplary embodiment of this application.
[0016] Figure 2 The diagram shown is a structural schematic of multiple sets of switch modules provided in an exemplary embodiment of this application.
[0017] Figure 3 The diagram shown is a structural schematic of multiple sets of switch modules provided in another exemplary embodiment of this application.
[0018] Figure 4 The diagram shown is a structural schematic of multiple sets of switch modules provided in another exemplary embodiment of this application.
[0019] Figure 5 The diagram shown is a structural schematic of multiple sets of switch modules provided in another exemplary embodiment of this application.
[0020] Figure 6 The diagram shown is a structural schematic of a battery system provided in another exemplary embodiment of this application.
[0021] Figure 7 The diagram shown is a structural schematic of multiple sets of switch modules provided in another exemplary embodiment of this application.
[0022] Figure 8 The diagram shown is a structural schematic of multiple sets of switch modules provided in another exemplary embodiment of this application. Detailed Implementation
[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0024] Currently, the control circuits in battery systems suffer from problems such as a single control method and poor reliability of the control process.
[0025] Specifically, in traditional automotive power architectures, lead-acid batteries provide a large current to the starter motor during vehicle startup, helping the engine start smoothly. Lead-acid batteries lack internal control units, making it impossible to monitor voltage, current, and temperature, thus failing to provide battery protection. Furthermore, these lead-acid batteries lack a corresponding functional safety rating. To control the circuit, relays, fuses, and other devices are introduced to control the power supply. These devices are relatively large, requiring significant space for placement, and relays produce noticeable noise when engaging, affecting the driving experience. Relays and fuses only offer one control method, and in the event of a fault, they neither provide protection nor report the fault, thus failing to meet different control strategies and functional safety objectives.
[0026] In the rapid development of new energy vehicles, lithium-ion batteries are gradually replacing lead-acid batteries. These batteries integrate a control unit that can monitor cell voltage, current, and temperature in real time. Simultaneously, they incorporate metal-oxide-semiconductor field-effect transistors (MOSFETs) to replace traditional relays and fuses, achieving miniaturization. However, current lithium-ion battery circuit control suffers from a lack of simplistic control methods, failing to meet diverse control strategies and functional safety objectives.
[0027] This application provides a battery system that incorporates multiple sets of switch modules, each controlled via a different signal port. This allows for the control of different switch modules through various signal ports, providing multiple possible control methods for the battery system and improving its safety and functionality.
[0028] The following section provides a detailed description of the specific structure and corresponding functions of the battery system provided in the embodiments of this application.
[0029] Figure 1 The diagram shown is a schematic diagram of the structure of a battery system provided in an exemplary embodiment of this application. Figure 2 The diagram shown is a structural schematic of multiple sets of switch modules provided in an exemplary embodiment of this application. (In conjunction with...) Figure 1 and Figure 2 The battery system may include: an energy storage module 100, multiple sets of switch modules 200, and a control module 300.
[0030] The energy storage module 100 may include a first electrode 110 and a second electrode 120 with opposite polarities. The battery system may also include a first output terminal 400 and a second output terminal 500. The first electrode 110 and the first output terminal 400 are electrically connected, and the second electrode 120 and the second output terminal 500 are electrically connected.
[0031] Multiple sets of switch modules 200 are connected in parallel. One end of each set of switch modules 200 is electrically connected to a first electrode 110, and the other end of each set of switch modules is electrically connected to a first output terminal 400. Each set of switch modules 200 includes at least one switch module 210, and each of the at least one switch module 210 includes a first switch element 211 and a second switch element 212 connected in series.
[0032] The control module 300 is used to acquire at least one of the voltage of the first electrode 110 and the voltage of the first output terminal 400, and to acquire the voltage of the connection point between the first switching element 211 and the second switching element 212 in the switching module 210. The control module 300 includes a plurality of first signal ports 321 and a plurality of second signal ports 322.
[0033] The multiple sets of first switching elements 211 in the multiple sets of switch modules 200 are electrically connected to multiple first signal ports 321 respectively, and the multiple sets of second switching elements 212 in the multiple sets of switch modules 200 are electrically connected to multiple second signal ports 322 respectively.
[0034] When any one of the multiple first signal ports 321 sends a first control signal, a set of first switching elements 211 connected to the first signal port 321 is in a closed state. When the first signal port 321 sends a second control signal, the set of first switching elements 211 connected to the first signal port 321 is in an open state.
[0035] When any one of the multiple second signal ports 322 sends a third control signal, a set of second switching elements 212 connected to the second signal port 322 is in a closed state. When the second signal port 322 sends a fourth control signal, the set of second switching elements 212 connected to the second signal port 322 is in an open state.
[0036] In one example, such as Figure 1 As shown, the energy storage module 100 may include a battery, which may include a single cell or multiple cells. The first electrode 110 and the second electrode 120 may be two electrodes of the energy storage module 100. For example, when the first electrode 110 is the positive electrode of the energy storage module 100, the second electrode 120 may be the negative electrode of the energy storage module 100; when the first electrode 110 is the negative electrode of the energy storage module 100, the second electrode 120 may be the positive electrode of the energy storage module 100. Figure 1 The battery system is described using the first electrode 110 as the positive electrode of the energy storage module 100 as an example. In this case, the first electrode 110 can be represented as BAT+, the second electrode 120 can be represented as BAT-, the first output terminal 400 can be represented as PACK+, and the second output terminal 500 can be represented as PACK-.
[0037] In one example, such as Figure 1 As shown, the control module 300 may include multiple first signal ports 321 and multiple second signal ports 322. The first signal ports 321 and the second signal ports 322 can be used to control the closing and opening of different switches in multiple sets of switch modules 200. Figure 2 The diagram shows two first signal ports 321 and two second signal ports 322. It should be understood that the number of first signal ports 321 can be greater than 2, and the specific number can be set according to actual needs. Similarly, the number of second signal ports 322 can also be greater than 2, and the specific number can also be set according to actual needs.
[0038] In one example, the control module 300 may include a microcontroller unit (MCU) and a driver. The microcontroller can be used to acquire at least one of the voltage of the first electrode 110 and the voltage of the first output terminal 400, and to acquire the voltage at the connection point between the first switching element 211 and the second switching element 212 in the switching module 210. The driver is electrically connected to the microcontroller and includes a plurality of first signal ports 321 and a plurality of second signal ports 322. In other examples, the control module 300 may include other types of controllers, as long as they can perform the above functions.
[0039] In one example, such as Figure 1 As shown, the circuit composed of multiple switch modules 200 can be called a control circuit. (See also...) Figure 2 Each set of switch modules 200 can be connected in parallel with multiple other sets of switch modules 200. Each set of switch modules 200 includes at least one switch module 210. In a set of switch modules 210, when the number of at least one switch module 210 is multiple, multiple switch modules 210 can be connected in parallel. Each switch module 210 includes a first switch element 211 and a second switch element 212 connected in series. One end of each set of switch modules 200 is electrically connected to a first electrode 110 (BAT+), and the other end of each set of switch modules 200 is electrically connected to a first output terminal 400 (PACK+).
[0040] In one example, the first switching element 211 may include a charging metal-oxide-semiconductor field-effect transistor (MOSFET), and the second switching element 212 may include a discharging MOSFET. The charging MOSFET may be located between the discharging MOSFET and the positive terminal BAT+ of the energy storage module 100, and the drain of the charging MOSFET may be connected to the drain of the discharging MOSFET. Of course, in other examples, the first switching element 211 and the second switching element 212 may be other types of switches, as long as they can achieve the functions corresponding to the first switching element 211 and the second switching element 212. The functions corresponding to the first switching element 211 and the second switching element 212 are described below.
[0041] In one example, the first switching element 211 in each group of switching modules 200 can be electrically connected to the first signal port 321, and the first switching elements 211 in different groups can be electrically connected to different first signal ports 321. For example, the first signal port 321 is a charging signal port, which can be represented as... Figure 2 CHG in the middle. Figure 2The diagram shows two charging signal ports, CHG1 and CHG2. CHG1 is electrically connected to a first switching element 211 in one set of switching modules 200, and CHG2 is electrically connected to a first switching element 211 in another set of switching modules 200. Similarly, the second signal port 322 is a discharging signal port, which can be represented as... Figure 2 DSG in the middle. Figure 2 The diagram shows two discharge signal ports, DSG1 and DSG2. DSG1 is electrically connected to a second switching element 212 in one set of switch modules 200, and DSG2 is electrically connected to a second switching element 212 in another set of switch modules 200. That is, the number of switch modules 200, the number of first signal ports 321, and the number of second signal ports 322 are the same. Each set of first switching elements in the multiple switch modules corresponds one-to-one with each first signal port, and each set of second switching elements in the multiple switch modules corresponds one-to-one with each second signal port.
[0042] In one example, when the first signal port 321 (CHG1 or CHG2) issues a first control signal, a set of first switching elements 211 connected to the first signal port 321 (CHG1 or CHG2) is in a closed state. When the first signal port 321 (CHG1 or CHG2) issues a second control signal, the set of first switching elements 211 connected to the first signal port 321 (CHG1 or CHG2) is in an open state. For example, the first control signal can be a high level, and the second control signal can be a low level. Of course, the first and second control signals can be other signals, as long as they can be used to control the closing and opening of the first switching elements 211. The second control signal can be used to control the disconnection of the current flowing from PACK+ to BAT+.
[0043] Similarly, when the second signal port 322 (DSG1 or DSG2) sends a third control signal, a set of second switching elements 212 connected to the second signal port 322 (DSG1 or DSG2) is in a closed state. When the second signal port 322 (DSG1 or DSG2) sends a fourth control signal, the set of second switching elements 212 connected to the second signal port 322 (DSG1 or DSG2) is in an open state. For example, the third control signal can be a high level, and the fourth control signal can be a low level. Of course, the third and fourth control signals can be other signals, as long as they can be used to control the closing and opening of the second switching elements 212. The fourth control signal can be used to control the disconnection of the current flowing from BAT+ to PACK+.
[0044] In this embodiment, by setting multiple sets of switch modules, the first switch elements of different sets are controlled by different first signal ports, and the second switch elements of different sets are controlled by different second signal ports. In this way, when a certain signal port (first signal port / second signal port) fails, the normal operation of the circuit can be ensured through other signal ports, that is, the normal control of the charging or discharging process can be guaranteed. This provides a variety of possible control methods for the battery system and improves the safety and functionality of the battery system.
[0045] Furthermore, by setting a first and second switching element in series within a switching module, bidirectional independent control can be achieved. By detecting the voltage across the switching module and the common terminal voltage, a short-circuit or open-circuit fault in the switching element can be determined. In one example, if a switching element malfunctions, the switching element can be disconnected first, and then the fault can be reported, further achieving Automotive Safety Integrity Level (ASIL) A and ASIL B functional safety levels.
[0046] Figure 2 The diagram shows two sets of switch modules 200, with multiple first signal ports 321 including two first signal ports 321 (CHG1 and CHG2), and multiple second signal ports 322 including two second signal ports 322 (DSG1 and DSG2). Two sets of first switching elements 211 in the two sets of switch modules 200 are electrically connected to the two first signal ports 321 (CHG1 and CHG2), respectively, and two sets of second switching elements 212 in the two sets of switch modules 200 are electrically connected to the two second signal ports 322 (DSG1 and DSG2), respectively.
[0047] In one example, the two sets of switch modules 200 include a first set of switch modules and a second set of switch modules, wherein the number of switch modules in the first set of switch modules may be equal to or greater than the number of switch modules in the second set of switch modules.
[0048] Specifically, multiple switching modules can be connected in parallel within a set of switching modules, thereby achieving higher current carrying capacity.
[0049] When the number of switch modules in the first set of switch modules is equal to the number of switch modules in the second set of switch modules, the safety of the battery system can be improved while the current carrying capacity of the two sets of switch modules can be increased.
[0050] When the number of switching modules in the first group of switching modules is greater than the number of switching modules in the second group, the safety of the battery system can be improved while ensuring that one group of switching modules has a high current-carrying capacity. This simplifies the structure of the battery system and reduces costs. For example, Figure 2 As shown, the first group of switch modules ( Figure 2 The number of switch modules in the first set of switch modules (200) on the left is 2, and the number of switch modules in the second set of switch modules ( Figure 2 The number of switch modules in the set of switch modules 200 on the right side is 1.
[0051] See one example. Figure 2 Assuming there are N pairs of charging MOSFETs (first switching element 211), using two first signal ports 321, namely CHG1 and CHG2. CHG1 and CHG2 control the opening and closing of the charging MOSFETs, thus controlling the current flow from PACK+ to BAT+. There are also N pairs of discharging MOSFETs (second switching element 212), using two second signal ports 322, namely DSG1 and DSG2. DSG1 and DSG2 control the opening and closing of the discharging MOSFETs, thus controlling the current flow from BAT+ to PACK+. By acquiring the voltages of BAT+, PACK+, and the common drain (D), a diagnostic strategy is used to identify whether a MOSFET (charging MOSFET or discharging MOSFET) is stuck or open-circuited. When a fault occurs in one of the signal ports (CHG1, CHG2, DSG1, or DSG2), such as... Figure 2 When DSG1 malfunctions, the discharge MOSFET controlled by DSG1 is disconnected, while the discharge MOSFET controlled by DSG2 remains on. Under these circumstances, charging and discharging can still continue. Furthermore, it is possible to report the fault first and then disconnect the switching element, achieving functional safety levels ASIL C and ASIL D.
[0052] In this example, two reliability design states can be defined based on the parity of the switching elements. The first state uses an even number of charging and discharging MOSFET pairs. The two signal ports (CHG1 and CHG2, or DSG1 and DSG2) control N / 2 switching elements each. If one signal port fails, the remaining port can still function normally, with a redundancy of (N / 2) / N = 50%. The second state uses an odd number of charging and discharging MOSFET pairs. The two signal ports (CHG1 and CHG2, or DSG1 and DSG2) control (N-1) / 2 and (N+1) / 2 switching elements respectively. If one signal port fails, the remaining port can still function normally, with a redundancy ranging from [(N-1) / 2] / N to [(N+1) / 2] / N. Correspondingly, if one MOSFET (charging or discharging) experiences an open-circuit fault, the remaining N-1 MOSFETs can still provide overcurrent capability, with a redundancy of (N-1) / N. Accordingly, if a MOSFET (charging MOSFET or discharging MOSFET) experiences a sticking fault, different redundancy levels can be achieved depending on whether charging or discharging is required. For example, if a charging MOSFET is stuck, the discharging MOSFET will not be affected, and the corresponding signal port of the charging MOSFET can be discarded. The charging redundancy is [(N-1) / 2] / N to [(N+1) / 2] / N. Similarly, the discharging MOSFET is treated the same way. This example provides a redundancy range of [(N-1) / 2] / N to 100% for different faults and states, offering high reliability. This solution can be used if the start-stop battery system requires limp-back to the factory.
[0053] This example demonstrates a switch module in the common-drain (D) state. If the switch module is changed to the common-source (S) state, it will have the same effect. Figure 3 The switching module in the common-source S state is shown. Figure 3 The structure of the multiple switch modules 200 shown is similar to Figure 2 The multiple switch modules 200 shown have similar structures, the difference being that... Figure 3 The switch module 210 shown is in the common-source S state. Figure 2 The switch module 210 shown is in common-drain (D) state. For example... Figure 3 As shown, the discharge MOSFET (second switching element 212) can be located between the charging MOSFET (first switching element 211) and the positive terminal BAT+ of the energy storage module 100, and the source of the charging MOSFET is connected to the source of the discharge MOSFET. Figure 3 The effects of the embodiments can be seen above. Figure 2 The effects of the embodiments will not be repeated here.
[0054] Figure 4 The diagram shown is a structural schematic of multiple sets of switch modules provided in another exemplary embodiment of this application. Figure 4 The structure of the multiple switch modules shown is similar to Figure 2 The multiple switch modules shown have similar structures, but differ in that... Figure 4 Each of the multiple sets of switch modules 200 shown includes a switch module 210. For example... Figure 4 As shown, different first switching elements 211 (charging MOSFETs) can be connected to different first signal ports 321, namely CHG1 to CHGN, and different second switching elements 212 (discharging MOSFETs) can be connected to different second signal ports 322, namely DSG1 to DSGN. In other words, Figure 4 The number of groups of switch modules 200 shown is N. Each group of switch modules 200 includes one switch module 210. The number of charging MOSFETs is equal to the number of first signal ports 321 (CHG1 to CHGN), and multiple charging MOSFETs correspond one-to-one with CHG1 to CHGN. Similarly, multiple discharging MOSFETs correspond one-to-one with DSG1 to DSGN.
[0055] In one example, Figure 4 The number of switch modules 200 shown can be greater than or equal to 3, that is, N can be greater than or equal to 3, which can improve the safety and reliability of the battery system. In addition, by setting one switch module in each switch module group, the structure of the battery system can be simplified and the cost reduced while ensuring the safety and reliability of the battery system.
[0056] In this example, by selecting a single signal port to drive a single switching element, all switching elements can be individually controlled, thus enabling multi-channel bidirectional individual control. Furthermore, by detecting the voltage across the switching module and the common terminal voltage, short-circuit or open-circuit faults in the switching elements can be determined. Even if one signal port fails, the remaining N-1 signal ports can continue to perform their respective functions. In this case, the fault can be reported first, and then the switching element can be disconnected, further achieving ASIL C and ASIL D functional safety levels.
[0057] In this example, each switching element is controlled using an independent signal port. There are N charging MOSFETs (first switching element 211), using N first signal ports 321, namely GHG1, GHG2…CHGN. GHG1, GHG2…CHGN control the opening and closing of the charging MOSFETs, thus controlling the current flow from PACK+ to BAT+. There are also N discharging MOSFETs (second switching element 212), using N second signal ports 322, namely DSG1, DSG2…DSGN. DSG1, DSG2…DSGN control the opening and closing of the discharging MOSFETs, thus controlling the current flow from BAT+ to PACK+. By acquiring the voltages of BAT+, PACK+, and the common drain (D), a diagnostic strategy identifies a specific MOSFET (charging or discharging MOSFET) with a sticking or open-circuit fault. When a fault occurs in one of the signal ports, such as… Figure 4 When DSG2 in the circuit malfunctions, the discharge MOSFET controlled by DSG2 will be disconnected, while the other (N-1) DSGs can still conduct. Under these circumstances, charging and discharging can still continue. Furthermore, it is possible to report the fault first and then disconnect the switching element, achieving functional safety levels ASIL C and ASIL D.
[0058] This example demonstrates high redundancy. For instance, with N pairs of switching elements (including the first switching element 211 and the second switching element 212), if one signal port fails, the remaining signal ports can still function normally, resulting in a redundancy of (N-1) / N. Similarly, if one MOSFET (charging or discharging) experiences an open-circuit fault, the remaining N-1 MOSFETs can still provide overcurrent protection, again achieving a redundancy of (N-1) / N. Likewise, if one MOSFET (charging or discharging) experiences a sticking fault, the remaining N-1 MOSFETs can still provide overcurrent protection, again achieving a redundancy of (N-1) / N. Furthermore, with proper design considerations, such as reserving a set of MOSFETs (switching modules) or adding heat dissipation measures, even if one MOSFET fails, normal operation can still be guaranteed, achieving 100% redundancy. This solution can be adopted if a signal port or switching element in the start-stop battery system fails, and the remaining signal ports need to meet the vehicle's operating conditions.
[0059] This example demonstrates a switch module in the common-drain (D) state. If the switch module is changed to the common-source (S) state, it will have the same effect. Figure 5 The switching module in the common-source S state is shown. Figure 5 The structure of the multiple switch modules 200 shown is similar to Figure 4The multiple switch modules 200 shown have similar structures, the difference being that... Figure 5 The switch module 210 shown is in the common-source S state. Figure 4 The switch module 210 shown is in common-drain (D) state. For example... Figure 5 As shown, the discharge MOSFET (second switching element 212) can be located between the charging MOSFET (first switching element 211) and the positive terminal BAT+ of the energy storage module 100, and the source of the charging MOSFET is connected to the source of the discharge MOSFET. Figure 5 The effects of the embodiments can be seen above. Figure 4 The effects of the embodiments will not be repeated here.
[0060] Figure 6 The diagram shown is a structural schematic of a battery system provided in another exemplary embodiment of this application. Figure 6 The structure of the battery system shown is similar to Figure 2 The battery systems shown have similar structures, but differ in that... Figure 6 In the battery system shown, the first electrode 110 is the negative electrode of the energy storage module 100, and the second electrode 120 is the positive electrode of the energy storage module 100. See also... Figure 6 The first electrode 110 can be represented as BAT-, the second electrode 120 can be represented as BAT+, the first output terminal 400 can be represented as PACK-, and the second output terminal 500 can be represented as PACK+.
[0061] Figure 7 It shows Figure 6 An exemplary embodiment of multiple sets of switch modules 200 in a [the embodiment]. For example... Figure 7 As shown, in any of the switching modules 210, the discharge MOSFET (second switching element 212) is located between the charging MOSFET (first switching element 211) and the negative terminal BAT- of the energy storage module 100, and the drain of the charging MOSFET is connected to the drain of the discharge MOSFET. Figure 7 Examples and Figure 2 The embodiments are similar, and the same parts can be found in the above description. Figure 2 The details of the previous descriptions will not be repeated here.
[0062] Figure 8 It shows Figure 6 Another exemplary embodiment of the multiple sets of switch modules 200 in the example. For example... Figure 8 As shown, in any of the switching modules 210, the charging MOSFET (first switching element 211) is located between the discharging MOSFET (second switching element 212) and the negative terminal BAT- of the energy storage module 100, and the source of the charging MOSFET is connected to the source of the discharging MOSFET. Figure 8 Examples and Figure 2The embodiments are similar, and the same parts can be found in the above description. Figure 2 The details of the previous descriptions will not be repeated here.
[0063] The battery system provided in this application embodiment can be used in low-voltage start-stop scenarios or other suitable scenarios.
[0064] According to the battery system provided in the embodiments of this application, the charging MOSFET and the discharging MOSFET can be diagnosed. An exemplary diagnostic strategy (which can be used for...) Figure 2 or Figure 4 The multiple switching modules are as follows: The MCU can acquire the voltage Vbat of BAT+ and the common-drain voltage Vcom, and calculate the absolute difference A between Vbat and Vcom; if a charging MOSFET closing command is detected, A can be compared with a fixed threshold B. If A < B, the charging MOSFET is normally closed; if A > B, the charging MOSFET is open. If a charging MOSFET opening command is detected, A can be compared with a fixed threshold B. If A > B, the charging MOSFET is normally open; if A < B, the charging MOSFET is stuck. Another exemplary diagnostic strategy (which can be used for...) Figure 2 or Figure 4 The multi-group switching module (in this case, a common-drain D-state multi-group switching module) is as follows: The MCU can acquire the voltage Vpack of PACK+ and the common-drain D-state voltage Vcom, and calculate the absolute difference A between Vpack and Vcom. If a discharge MOSFET closing command is detected, A can be compared with a fixed threshold B. If A < B, the discharge MOSFET is normally closed; if A > B, the discharge MOSFET is open. If a discharge MOSFET opening command is detected, A can be compared with a fixed threshold B. If A > B, the discharge MOSFET is normally open; if A < B, the discharge MOSFET is stuck. This diagnostic strategy is for multi-group switching modules in the common-drain D-state. If the multi-group switching module is changed to the common-source S-state, the diagnostic strategy is similar and will not be elaborated here.
[0065] All the above-mentioned optional technical solutions can be combined in any way to form the optional embodiments of this application, and will not be described in detail here. The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0066] It should be noted that in the description of this application, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means two or more. In addition, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed.
[0067] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A battery system, characterized in that, include: The energy storage module includes a first electrode and a second electrode with opposite polarities. The battery system also includes a first output terminal and a second output terminal, and the second electrode and the second output terminal are electrically connected. Multiple sets of switch modules are connected in parallel. One end of each set of switch modules is electrically connected to the first electrode, and the other end of each set of switch modules is electrically connected to the first output terminal. Each set of switch modules includes at least one switch module, and each of the at least one switch module includes a first switch element and a second switch element connected in series. The control module is used to acquire at least one of the voltage of the first electrode and the voltage of the first output terminal, and to acquire the voltage at the connection point between the first switching element and the second switching element in the switching module. The control module includes multiple first signal ports and multiple second signal ports. The multiple sets of first switching elements in the multiple sets of switch modules are electrically connected to the multiple sets of first signal ports, and the multiple sets of second switching elements in the multiple sets of switch modules are electrically connected to the multiple sets of second signal ports. When any one of the plurality of first signal ports sends a first control signal, a set of first switching elements connected to the first signal port is in a closed state; when the first signal port sends a second control signal, the set of first switching elements connected to the first signal port is in an open state. When any one of the plurality of second signal ports issues a third control signal, a set of second switching elements connected to the second signal port is in a closed state; when the second signal port issues a fourth control signal, a set of second switching elements connected to the second signal port is in an open state.
2. The battery system according to claim 1, characterized in that, The plurality of switch modules includes two switch modules, the plurality of first signal ports includes two first signal ports, and the plurality of second signal ports includes two second signal ports. The two sets of first switching elements in the two sets of switching modules are electrically connected to the two first signal ports respectively, and the two sets of second switching elements in the two sets of switching modules are electrically connected to the two second signal ports respectively.
3. The battery system according to claim 2, characterized in that, The two sets of switch modules include a first set of switch modules and a second set of switch modules, wherein the number of switch modules in the first set of switch modules is greater than the number of switch modules in the second set of switch modules.
4. The battery system according to claim 3, characterized in that, The first group of switch modules contains 2 switch modules, and the second group of switch modules contains 1 switch module.
5. The battery system according to claim 1, characterized in that, Each of the multiple switch modules includes one switch module, and the number of the multiple switch modules is greater than or equal to 3.
6. The battery system according to claim 1, characterized in that, The first electrode is the positive electrode of the energy storage module, the first switching element includes a charging MOSFET, the second switching element includes a discharging MOSFET, in the switching module, the charging MOSFET is located between the discharging MOSFET and the positive electrode of the energy storage module, and the drain of the charging MOSFET is connected to the drain of the discharging MOSFET.
7. The battery system according to claim 1, characterized in that, The first electrode is the positive electrode of the energy storage module, the first switching element includes a charging MOSFET, the second switching element includes a discharging MOSFET, in the switching module, the discharging MOSFET is located between the charging MOSFET and the positive electrode of the energy storage module, and the source of the charging MOSFET is connected to the source of the discharging MOSFET.
8. The battery system according to claim 1, characterized in that, The first electrode is the negative electrode of the energy storage module, the first switching element includes a charging MOSFET, the second switching element includes a discharging MOSFET, in the switching module, the discharging MOSFET is located between the charging MOSFET and the negative electrode of the energy storage module, and the drain of the charging MOSFET is connected to the drain of the discharging MOSFET.
9. The battery system according to claim 1, characterized in that, The first electrode is the negative electrode of the energy storage module, the first switching element includes a charging MOSFET, the second switching element includes a discharging MOSFET, in the switching module, the charging MOSFET is located between the discharging MOSFET and the negative electrode of the energy storage module, and the source of the charging MOSFET is connected to the source of the discharging MOSFET.
10. The battery system according to any one of claims 1 to 9, characterized in that, The control module includes: A microcontroller is configured to acquire at least one of the voltage of the first electrode and the voltage of the first output terminal, and to acquire the voltage at the connection point between the first switching element and the second switching element in the switching module; A driver, electrically connected to the microcontroller, the driver including the plurality of first signal ports and the plurality of second signal ports.