Battery management circuit and battery pack

Abstract

The application provides a battery management circuit and a battery pack, and relates to the technical field of batteries. The circuit comprises a collection module, a control module and a plurality of series-connected cell modules; each cell module comprises a cell, a first switch module and a second switch module. The whole after the second switch module is connected in series with the cell is connected in parallel with the first switch module. The collection module is connected with each cell respectively, and the collection module is also connected with the control module. The control module is also connected with each first switch module and each second switch module respectively. The collection module collects state data of each cell and sends the state data of each cell to the control module. The control module judges whether the cell is invalid according to the state data of each cell, controls the second switch module corresponding to the invalid cell to be disconnected and the first switch module to be closed, controls the second switch module corresponding to the normal cell to be closed and the first switch module to be disconnected, and thus the reliability and safety of the battery pack are improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery management circuit and a battery pack. Background Technology

[0002] With the development of new energy technologies, battery packs, as core energy storage units, have been widely used in electric vehicles, energy storage systems, smart homes, and portable electronic devices.

[0003] However, for battery packs with a series-connected cell structure, the overall performance of the pack is limited by the weakest cell. The failure of one or more cells often leads to the failure of the entire battery pack, rendering it unusable and resulting in a shortened lifespan and reduced reliability. Furthermore, sudden cell failures during use can not only cause equipment downtime but also trigger safety hazards such as thermal runaway, threatening the reliability and safety of the battery pack.

[0004] Therefore, how to improve the reliability and safety of battery packs is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this application is to provide a battery management circuit and a battery pack to improve the reliability and safety of the battery pack.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: On the one hand, this application provides a battery management circuit, which includes: a data acquisition module, a control module, and multiple battery cell modules connected in series; Each of the battery cell modules includes a battery cell, a first switch module, and a second switch module; the second switch module and the battery cell are connected in series as a whole, and are connected in parallel with the first switch module. The input terminal of the acquisition module is connected to each of the battery cells, and the acquisition module is also connected to the control module. The output terminal of the control module is connected to the control terminal of each of the first switch modules and each of the second switch modules. The acquisition module is used to acquire the status data of each of the battery cells and send the status data of each of the battery cells to the control module; The control module is used to determine whether a battery cell is faulty based on the status data of each battery cell, control the second switch module corresponding to the faulty battery cell to open and the first switch module to close; and control the second switch module corresponding to the normal battery cell to close and the first switch module to open.

[0007] Furthermore, the acquisition module includes an analog front-end chip; the analog front-end chip integrates multiple voltage acquisition channels, and each voltage acquisition channel is connected to the positive and negative terminals of a single battery cell.

[0008] Furthermore, the acquisition module also includes temperature acquisition units that are matched one-to-one with the multiple battery cells, and the analog front-end chip also integrates multiple temperature acquisition channels; each temperature acquisition unit is respectively set on a single battery cell, and each temperature acquisition channel is respectively connected to the corresponding temperature acquisition unit.

[0009] Furthermore, the control module includes a main control unit and a switch control unit; The main control unit is connected to the acquisition module and the switch control unit respectively, and the output terminal of the switch control unit is connected to the control terminal of each first switch module and each second switch module respectively. The main control unit is used to receive the status data of each battery cell sent by the acquisition module, and send corresponding control commands to the switch control unit according to the status data of each battery cell; The switch control unit is used to control the on / off state of the first switch module and the second switch module corresponding to each battery cell according to the received control command.

[0010] Furthermore, the acquisition module and the main control unit communicate via I2C or SPI, and the main control unit and the switch control unit communicate via I2C or SPI.

[0011] Furthermore, each of the battery cell modules also includes a light-emitting diode; The first port of the first switch module is connected to the negative terminal of the battery cell, and the second port of the first switch module is connected to the cathode of the light-emitting diode; the first port of the second switch module is connected to the positive terminal of the battery cell, and the second port of the second switch module is connected to the anode of the light-emitting diode. Alternatively, the first port of the first switch module is connected to the anode of the light-emitting diode, and the cathode of the light-emitting diode is connected to the negative terminal of the battery cell; the first port of the second switch module is connected to the positive terminal of the battery cell, and the second port of the second switch module is connected to the second port of the first switch module.

[0012] Furthermore, each of the battery cell modules also includes a light-emitting diode; The first port of the first switch module is connected to the first port of the second switch module, the second port of the first switch module is connected to the cathode of the light-emitting diode, and the anode of the light-emitting diode is connected to the positive electrode of the battery cell. Alternatively, the first port of the first switch module is connected to the anode of the light-emitting diode, and the cathode of the light-emitting diode is connected to the first port of the second switch module; the second port of the second switch module is connected to the negative terminal of the battery cell, and the second port of the first switch module is connected to the positive terminal of the battery cell.

[0013] Furthermore, the first switch module and the second switch module are integrated into a switch circuit; The first port of the switching circuit is connected to the positive terminal of the battery cell, the third port of the switching circuit is connected to the negative terminal of the battery cell, and the second port of the switching circuit is connected to the fourth port of the switching circuit. Alternatively, the first port of the switching circuit is connected to the third port of the switching circuit, the second port of the switching circuit is connected to the negative terminal of the battery cell, and the fourth port of the switching circuit is connected to the positive terminal of the battery cell. The control module is used to control the first and second ports of the switching circuit corresponding to the failed battery cell to open, and the third and fourth ports to close; and to control the first and second ports of the switching circuit corresponding to the normal battery cell to close, and the third and fourth ports to open.

[0014] Furthermore, both the first switch module and the second switch module are DC contactors.

[0015] On the other hand, this application also provides a battery pack, which includes a battery management circuit as described in any of the foregoing embodiments.

[0016] Compared with the prior art, this application has the following advantages: This application provides a battery management circuit and a battery pack. The battery management circuit includes: a data acquisition module, a control module, and multiple battery cell modules connected in series. Each battery cell module includes a battery cell, a first switch module, and a second switch module. The second switch module, connected in series with the battery cell, is connected in parallel with the first switch module. The input terminal of the data acquisition module is connected to each battery cell, and the data acquisition module is also connected to the control module. The output terminal of the control module is connected to the control terminals of each first switch module and each second switch module. The data acquisition module collects the status data of each battery cell and sends the status data of each battery cell to the control module. The control module determines whether a battery cell has failed based on the status data of each battery cell, controls the second switch module corresponding to the failed battery cell to open and the first switch module to close; and controls the second switch module corresponding to the normal battery cell to close and the first switch module to open.

[0017] This application monitors the status data of each battery cell in real time and configures a corresponding first and second switch module for each cell. When one or more cells fail, the control module can control the on / off state of the corresponding first and second switch modules, promptly isolating the failed cell from the main circuit to prevent safety issues such as thermal failure, while maintaining the continuity of normal cells. This avoids the failed cell affecting overall performance while ensuring the remaining cells continue to operate normally, extending the battery pack's lifespan. By dynamically adjusting the battery topology, this design achieves a balance between fault isolation and continuous battery system operation, effectively improving the reliability and safety of the battery pack. Attached Figure Description

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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, not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0019] Figure 1 This is one of the structural schematic diagrams of a battery management circuit provided in an embodiment of this application; Figure 2 This is a second schematic diagram of a battery management circuit provided in an embodiment of this application; Figure 3 This is one of the schematic diagrams showing the connection between a light-emitting diode and a first switch module, a second switch module, and a battery cell, provided in an embodiment of this application. Figure 4 A second schematic diagram illustrating the connection between a light-emitting diode and a first switch module, a second switch module, and a battery cell, provided in an embodiment of this application; Figure 5 A third schematic diagram illustrating the connection between a light-emitting diode and a first switch module, a second switch module, and a battery cell, provided as an embodiment of this application; Figure 6 Fourth schematic diagram of the connection between a light-emitting diode and a first switch module, a second switch module and a battery cell provided in this application embodiment; Figure 7 This is the third schematic diagram of a battery management circuit provided in the embodiments of this application; Figure 8This is the fourth schematic diagram of a battery management circuit provided in the embodiments of this application.

[0020] Icons: 10-Battery management circuit; 100-Acquisition module; 110-Analog front-end chip; 200-Control module; 210-Main control unit; 220-Switch control unit; 300-First switch module; 400-Second switch module; 500-Switch circuit. Detailed Implementation

[0021] 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 a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] In the description of this application, it should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The term "connection" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0023] As described in the background section, for battery packs with a series-connected cell structure, the failure of one or more cells will lead to the failure of the entire battery pack, thereby shortening its lifespan and reducing its reliability. Furthermore, sudden cell failures during use can not only cause equipment downtime but may also trigger safety hazards such as thermal runaway, threatening the reliability and safety of the battery pack. Therefore, improving the reliability and safety of battery packs is a technical problem that urgently needs to be solved by those skilled in the art.

[0024] To resolve the above technical issues, please refer to Figure 1 This application provides a battery management circuit 10, which includes a data acquisition module 100, a control module 200, and multiple battery cell modules connected in series. Each battery cell module includes a battery cell, a first switch module 300, and a second switch module 400.

[0025] The second switch module 400, connected in series with the battery cell, is connected in parallel with the first switch module 300. The input terminal of the acquisition module 100 is connected to each battery cell, and the acquisition module 100 is also communicatively connected to the control module 200. The output terminal of the control module 200 is connected to the control terminal of each first switch module 300 and each second switch module 400.

[0026] The acquisition module 100 is used to acquire the status data of each battery cell and send the status data of each battery cell to the control module 200.

[0027] The control module 200 is used to determine whether a battery cell is faulty based on the status data of each battery cell, and controls the second switch module 400 corresponding to the faulty battery cell to open and the first switch module 300 to close; and controls the second switch module 400 corresponding to the normal battery cell to close and the first switch module 300 to open.

[0028] For example, assuming there are N battery cell modules connected in series, the total number of battery cells in the entire battery management circuit 10 is N (i.e., cell 1 to cell N), the number of first switch modules 300 is N, and the number of second switch modules 400 is also N. Each battery cell is matched with one first switch module 300 and one second switch module 400. The acquisition module 100 acquires the status data of the N battery cells in real time and sends the status data of the N battery cells to the control module 200. The control module 200 processes and analyzes the status data of the N battery cells.

[0029] When the control module 200 determines that cells 1 through N are all normal (i.e., under normal conditions), the control module 200 controls all second switch modules 400 to close and all first switch modules 300 to open. At this time, all N cells are in normal working condition, and the N cells connected in series output voltage normally. Among them, the negative terminal of cell 1 serves as the negative terminal of the entire battery pack and is grounded, and the positive terminal of cell N serves as the positive terminal of the entire battery pack.

[0030] When the control module 200 determines that cell 1 has failed, while cells 2 through N are all normal (i.e., in the case of a single cell failure), the control module 200 controls the second switch module 400 corresponding to cell 1 (i.e., the failed cell) to open and the first switch module 300 to close, thereby isolating cell 1; and controls the second switch modules 400 corresponding to cells 2 through N (i.e., normal cells) to close and the first switch module 300 to open. At this time, N-1 cells connected in series output voltage normally. Among them, the negative terminal of cell 2 serves as the negative terminal of the entire battery pack and is grounded, and the positive terminal of cell N serves as the positive terminal of the entire battery pack.

[0031] When the control module 200 determines that both cell 1 and cell 2 have failed, while cells 3 through N are functioning normally (i.e., in the case of multiple cell failures), the control module 200 controls the second switch module 400 corresponding to cell 1 to open and the first switch module 300 to close, thereby isolating cell 1; it controls the second switch module 400 corresponding to cell 2 to open and the first switch module 300 to close, thereby isolating cell 2; and it controls the second switch modules 400 corresponding to cells 3 through N to close and the first switch module 300 to open. At this time, N-2 cells connected in series will output voltage normally. The negative terminal of cell 3 serves as the negative terminal of the entire battery pack and is grounded, while the positive terminal of cell N serves as the positive terminal of the entire battery pack.

[0032] Based on the above design, this application monitors the status data of each battery cell in real time and configures a corresponding first switch module 300 and second switch module 400 for each cell. When one or more cells fail, the control module 200 controls the on / off state of the corresponding first switch module 300 and second switch module 400, promptly isolating the failed cell from the main circuit to prevent safety issues such as thermal failure, while maintaining the continuity of normal cells. This avoids the failed cell affecting overall performance while ensuring the remaining cells continue to operate normally, extending the battery pack's lifespan. This design achieves a balance between fault isolation and continuous battery system operation by dynamically adjusting the battery topology, effectively improving the reliability and safety of the battery pack.

[0033] Further, please refer to Figure 2 As an optional implementation, the cell status data includes the cell voltage data, and the acquisition module 100 includes an analog front-end (AFE) chip 110. The analog front-end chip 110 integrates multiple voltage acquisition channels, each of which is connected to the positive and negative terminals of a single cell.

[0034] Based on the above design, the analog front-end chip 110 can monitor and acquire the voltage of each individual cell in the battery pack in real time through its integrated multi-channel voltage acquisition. The analog front-end chip 110 adopts a differential sampling architecture, with each voltage acquisition channel connected to the positive and negative terminals of the corresponding cell. Through high-precision ADC conversion and digital filtering, the accuracy and real-time performance of the voltage data are ensured.

[0035] As another optional implementation, the cell status data also includes the cell temperature data. The acquisition module 100 also includes temperature acquisition units that are matched and set one by one with multiple cells, and the analog front-end chip 110 also integrates multiple temperature acquisition channels.

[0036] Each temperature acquisition unit is located on a single battery cell, and each temperature acquisition channel is connected to its corresponding temperature acquisition unit. Optionally, the temperature acquisition unit can be a thermistor (NTC / PTC), a digital temperature sensor, a thermocouple, or an infrared temperature sensor.

[0037] Based on the above design, the analog front-end chip 110, through its integrated multi-channel temperature acquisition and matching temperature acquisition units, can achieve real-time monitoring of the temperature of each individual cell in the battery pack. This architecture employs a distributed temperature acquisition scheme, with each temperature sensing unit directly installed at the critical temperature rise point of the corresponding cell. Temperature data is transmitted to the analog front-end chip 110 via a dedicated temperature acquisition channel for signal conditioning and digital processing, thereby ensuring the real-time performance and accuracy of the temperature data. Simultaneously, it provides reliable data support for thermal runaway detection and equalization control.

[0038] Therefore, the acquisition module 100 can collect the operating data of each cell in real time, and the control module 200 processes and analyzes the operating data of each cell, controlling the on / off state of the corresponding first switch module 300 and second switch module 400, thereby isolating the failed cell in a timely manner. This active protection architecture not only effectively prevents the chain reaction caused by the failure of a single cell, but also improves the safety and reliability of the entire battery system, providing a strong guarantee for the long-term stable operation of the battery pack.

[0039] Furthermore, in this embodiment, the control module 200 includes a main control unit 210 and a switch control unit 220. The main control unit 210 is communicatively connected to the acquisition module 100 and the switch control unit 220, respectively, and the output terminal of the switch control unit 220 is connected to the control terminal of each first switch module 300 and each second switch module 400.

[0040] The main control unit 210 is used to receive the status data of each cell sent by the acquisition module 100, and send the corresponding control command to the switch control unit 220 according to the status data of each cell.

[0041] The switch control unit 220 is used to control the on / off state of the first switch module 300 and the second switch module 400 corresponding to each battery cell according to the received control commands.

[0042] Optionally, the acquisition module 100 and the main control unit 210 communicate via I2C or SPI to transmit the status data of the battery cell. The main control unit 210 and the switch control unit 220 communicate via I2C or SPI to transmit control commands.

[0043] Furthermore, to further enhance the reliability and safety of the battery pack, each cell module in this embodiment also includes a light-emitting diode (LED). The LEDs can be connected to the first switch module 300, the second switch module 400, and the battery cells using various configuration methods.

[0044] In one alternative implementation, such as Figure 3 As shown, the first port of the first switch module 300 is connected to the negative terminal of the battery cell, and the second port of the first switch module 300 is connected to the cathode of the light-emitting diode. Furthermore, the first port of the second switch module 400 is connected to the positive terminal of the battery cell, and the second port of the second switch module 400 is connected to the anode of the light-emitting diode.

[0045] Or, such as Figure 4 As shown, the first port of the first switch module 300 is connected to the anode of the light-emitting diode (LED), and the cathode of the LED is connected to the negative terminal of the battery cell. Furthermore, the first port of the second switch module 400 is connected to the positive terminal of the battery cell, and the second port of the second switch module 400 is connected to the second port of the first switch module 300.

[0046] In another alternative implementation, such as Figure 5 As shown, the first port of the first switch module 300 is connected to the first port of the second switch module 400. Furthermore, the second port of the first switch module 300 is connected to the cathode of the light-emitting diode (LED), and the anode of the LED is connected to the positive terminal of the battery cell.

[0047] Or, such as Figure 6 As shown, the first port of the first switch module 300 is connected to the anode of the light-emitting diode (LED), and the cathode of the LED is connected to the first port of the second switch module 400. Furthermore, the second port of the second switch module 400 is connected to the negative terminal of the battery cell, and the second port of the first switch module 300 is connected to the positive terminal of the battery cell.

[0048] When the control module 200 determines that a certain battery cell has failed, it simultaneously opens the second switch module 400 corresponding to the failed battery cell and closes the first switch module 300, while the LED is illuminated to issue a warning. For normally functioning battery cells, since the first switch module 300 corresponding to the normal battery cell is open, the LED corresponding to the normal battery cell is not illuminated. That is, this application ensures that only the LED corresponding to the failed battery cell is illuminated, while the LED corresponding to the normal battery cell remains unilluminated.

[0049] The above design achieves precise location and visual alarm for failed battery cells, offering the following technical advantages: First, it employs hardware cascade control to ensure synchronous completion of fault indication and protection actions; second, it achieves intelligent driving of LEDs through the state combination of the first switch module 300 and the second switch module 400, eliminating the need for additional control circuitry; and third, it establishes a one-to-one fault indication mechanism, ensuring that only the LED of the failed battery cell is illuminated, thus preventing false alarms. This approach not only provides maintenance personnel with intuitive fault location guidance but also significantly enhances the overall safety of the battery pack through the dual protection of electrical isolation and visual warnings, providing reliable safety assurance for the power battery system.

[0050] Furthermore, it should be noted that the first switch module 300 and the second switch module 400 in the embodiments of this application can be of various types.

[0051] In one alternative implementation, the first switch module 300 and the second switch module 400 are two independent switching devices. For example, both the first switch module 300 and the second switch module 400 are DC contactors.

[0052] In another alternative implementation, the first switch module 300 and the second switch module 400 are integrated into the same switching device, achieving a unified design and thus reducing the overall size of the circuit. For details, please refer to... Figure 7 and Figure 8 The first switch module 300 and the second switch module 400 are integrated into a switch circuit 500.

[0053] like Figure 7 As shown, the first port Q1 of the switching circuit 500 is connected to the positive terminal of the battery cell, the third port Q3 of the switching circuit 500 is connected to the negative terminal of the battery cell, and the second port Q2 of the switching circuit 500 is connected to the fourth port Q4 of the switching circuit 500.

[0054] Or, such as Figure 8 As shown, the first port Q1 of the switching circuit 500 is connected to the third port Q3 of the switching circuit 500, the second port Q2 of the switching circuit 500 is connected to the negative terminal of the battery cell, and the fourth port Q4 of the switching circuit 500 is connected to the positive terminal of the battery cell.

[0055] The control module 200 is used to control the first port Q1 and the second port Q2 of the switching circuit 500 corresponding to the failed battery cell to open (equivalent to controlling the second switching module 400 corresponding to the failed battery cell to open), and the third port Q3 and the fourth port Q4 to close (equivalent to controlling the first switching module 300 corresponding to the failed battery cell to close); and to control the first port Q1 and the second port Q2 of the switching circuit 500 corresponding to the normal battery cell to close (equivalent to controlling the second switching module 400 corresponding to the normal battery cell to close), and the third port Q3 and the fourth port Q4 to open (equivalent to controlling the first switching module 300 corresponding to the normal battery cell to open).

[0056] Based on the above design, by integrating the first switch module 300 and the second switch module 400 into a switch circuit 500, the number of components in the circuit can be effectively reduced, thereby saving installation space and reducing the complexity of the overall structure. This is especially suitable for applications with strict requirements on size and weight. More importantly, the integrated switch circuit 500 can reduce the connection lines between modules, reduce the risk of failure due to poor contact or aging lines, and further improve the reliability and safety of the battery pack.

[0057] Furthermore, embodiments of this application also provide a battery pack, which includes a battery management circuit 10 as described in any of the foregoing embodiments.

[0058] In summary, this application provides a battery management circuit and battery pack. The battery management circuit includes a data acquisition module, a control module, and multiple battery cell modules connected in series. Each battery cell module includes a battery cell, a first switch module, and a second switch module. The second switch module, connected in series with the battery cell, is connected in parallel with the first switch module. The input terminal of the data acquisition module is connected to each battery cell, and the data acquisition module is also connected to the control module. The output terminal of the control module is connected to the control terminals of each first switch module and each second switch module. The data acquisition module collects the status data of each battery cell and sends the status data of each battery cell to the control module. The control module determines whether a battery cell has failed based on the status data of each battery cell, controls the second switch module corresponding to the failed battery cell to open and the first switch module to close; and controls the second switch module corresponding to the normal battery cell to close and the first switch module to open.

[0059] This application monitors the status data of each battery cell in real time and configures a corresponding first and second switch module for each cell. When one or more cells fail, the control module can control the on / off state of the corresponding first and second switch modules, promptly isolating the failed cell from the main circuit to prevent safety issues such as thermal failure, while maintaining the continuity of normal cells. This avoids the failed cell affecting overall performance while ensuring the remaining cells continue to operate normally, extending the battery pack's lifespan. By dynamically adjusting the battery topology, this design achieves a balance between fault isolation and continuous battery system operation, effectively improving the reliability and safety of the battery pack.

[0060] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0061] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A battery management circuit, characterized in that, The battery management circuit includes: a data acquisition module, a control module, and multiple battery cell modules connected in series; Each of the battery cell modules includes a battery cell, a first switch module, and a second switch module; the second switch module and the battery cell are connected in series as a whole, and are connected in parallel with the first switch module. The input terminal of the acquisition module is connected to each of the battery cells, and the acquisition module is also connected to the control module. The output terminal of the control module is connected to the control terminal of each of the first switch modules and each of the second switch modules. The acquisition module is used to acquire the status data of each of the battery cells and send the status data of each of the battery cells to the control module; The control module is used to determine whether a battery cell is faulty based on the status data of each battery cell, control the second switch module corresponding to the faulty battery cell to open and the first switch module to close; and control the second switch module corresponding to the normal battery cell to close and the first switch module to open.

2. The battery management circuit according to claim 1, characterized in that, The acquisition module includes an analog front-end chip; the analog front-end chip integrates multiple voltage acquisition channels, and each voltage acquisition channel is connected to the positive and negative terminals of a single battery cell.

3. The battery management circuit according to claim 2, characterized in that, The acquisition module also includes temperature acquisition units that are matched one-to-one with the multiple battery cells, and the analog front-end chip also integrates multiple temperature acquisition channels; each temperature acquisition unit is respectively set on a single battery cell, and each temperature acquisition channel is respectively connected to the corresponding temperature acquisition unit.

4. The battery management circuit according to claim 1, characterized in that, The control module includes a main control unit and a switch control unit; The main control unit is connected to the acquisition module and the switch control unit respectively, and the output terminal of the switch control unit is connected to the control terminal of each first switch module and each second switch module respectively. The main control unit is used to receive the status data of each battery cell sent by the acquisition module, and send corresponding control commands to the switch control unit according to the status data of each battery cell; The switch control unit is used to control the on / off state of the first switch module and the second switch module corresponding to each battery cell according to the received control command.

5. The battery management circuit according to claim 4, characterized in that, The acquisition module and the main control unit communicate via I2C or SPI, and the main control unit and the switch control unit communicate via I2C or SPI.

6. The battery management circuit according to claim 1, characterized in that, Each of the battery cell modules also includes a light-emitting diode; The first port of the first switch module is connected to the negative terminal of the battery cell, and the second port of the first switch module is connected to the cathode of the light-emitting diode; the first port of the second switch module is connected to the positive terminal of the battery cell, and the second port of the second switch module is connected to the anode of the light-emitting diode. Alternatively, the first port of the first switch module is connected to the anode of the light-emitting diode, and the cathode of the light-emitting diode is connected to the negative terminal of the battery cell; the first port of the second switch module is connected to the positive terminal of the battery cell, and the second port of the second switch module is connected to the second port of the first switch module.

7. The battery management circuit according to claim 1, characterized in that, Each of the battery cell modules also includes a light-emitting diode; The first port of the first switch module is connected to the first port of the second switch module, the second port of the first switch module is connected to the cathode of the light-emitting diode, and the anode of the light-emitting diode is connected to the positive electrode of the battery cell. Alternatively, the first port of the first switch module is connected to the anode of the light-emitting diode, and the cathode of the light-emitting diode is connected to the first port of the second switch module; the second port of the second switch module is connected to the negative terminal of the battery cell, and the second port of the first switch module is connected to the positive terminal of the battery cell.

8. The battery management circuit according to claim 1, characterized in that, The first switch module and the second switch module are integrated into a switch circuit; The first port of the switching circuit is connected to the positive terminal of the battery cell, the third port of the switching circuit is connected to the negative terminal of the battery cell, and the second port of the switching circuit is connected to the fourth port of the switching circuit. Alternatively, the first port of the switching circuit is connected to the third port of the switching circuit, the second port of the switching circuit is connected to the negative terminal of the battery cell, and the fourth port of the switching circuit is connected to the positive terminal of the battery cell. The control module is used to control the first and second ports of the switching circuit corresponding to the failed battery cell to be disconnected, and the third and fourth ports to be closed. It controls the first and second ports of the switching circuit corresponding to the normal battery cell to close, and the third and fourth ports to open.

9. The battery management circuit according to claim 1, characterized in that, Both the first switch module and the second switch module are DC contactors.

10. A battery pack, characterized in that, The battery pack includes the battery management circuitry as described in any one of claims 1-9.

Images