Charging control circuit of battery system and electronic equipment

Abstract

The utility model relates to the technical field of battery charging, and discloses a charging control circuit of a battery system and electronic equipment, and the first end of a branch control circuit is electrically connected with the positive electrode of the battery system and the first end of a battery management circuit; the second end of the branch control circuit is electrically connected with the target control circuit; the second end of the battery management circuit is electrically connected with the signal end of the battery system; the third end of the battery management circuit is electrically connected with the first end of the signal transmission circuit; the battery system comprises at least two battery branches; wherein when any battery branch in the battery system is detected to meet a preset voltage condition, the battery management circuit controls the branch control circuit to disconnect the charging branch corresponding to the target battery branch, and the signal transmission circuit transmits a charging process control signal to the target circuit to adjust the charging process. Therefore, the charging efficiency and reliability of the battery system can be improved while the consistency between the battery cells arranged in the battery system is maintained.

Description

Technical Field

[0001] This application relates to the field of battery charging technology, and in particular to a charging control circuit and electronic device for a battery system. Background Technology

[0002] As users demand higher driving ranges for new energy vehicles, the number of large-capacity battery solutions in existing new energy vehicles (such as buses) is also increasing, requiring the inclusion of more battery circuits in the battery systems of these vehicles. Therefore, it is necessary to select appropriate charging strategies to meet the charging needs of large-capacity, multi-circuit battery systems.

[0003] Existing technologies typically employ a single-branch charging control strategy. Specifically, this strategy involves stopping charging the battery system once the highest-voltage cell in a particular branch reaches its full-charge voltage. However, in practical applications, this single-branch charging control strategy can easily prevent cells in other branches from reaching full charge for extended periods, leading to over-discharge of lower-voltage cells. This can damage cell performance (e.g., capacity, lifespan) and increase the differences between cells across the battery system's multiple branches, hindering the maintenance of cell consistency within the battery system.

[0004] Therefore, it is particularly important to provide a technical solution that can improve the charging efficiency and charging reliability of the battery system while maintaining the consistency between the cells in the battery system. Utility Model Content

[0005] This application provides a charging control circuit and electronic device for a battery system, which can improve the charging efficiency and charging reliability of the battery system while maintaining the consistency between the cells in the battery system.

[0006] To address the aforementioned technical problems, the first aspect of this application discloses a charging control circuit for a battery system. The charging control circuit includes a branch control circuit, a battery management circuit, and a signal transmission circuit, wherein:

[0007] The first terminal of the branch control circuit is used to electrically connect to the positive terminal of the battery system and the first terminal of the battery management circuit; the second terminal of the branch control circuit is used to electrically connect to the target control circuit; the second terminal of the battery management circuit is used to electrically connect to the signal terminal of the battery system; the third terminal of the battery management circuit is electrically connected to the first terminal of the signal transmission circuit; the battery system includes at least two battery branches;

[0008] The battery management circuit is used to control the branch control circuit to disconnect the charging branch corresponding to the target battery branch when it detects that any of the battery branches in the battery system meets the preset voltage conditions, and to transmit a charging process control signal to the target circuit through the signal transmission circuit to adjust the charging process.

[0009] As an optional implementation, in the first aspect of this application, the branch control circuit includes a conduction control unit corresponding to each of the battery branches, wherein:

[0010] For each of the battery branches, the first terminal of the corresponding conduction control unit is used to electrically connect the positive terminal of the battery branch and the first terminal of the battery management circuit, respectively, and the second terminal of the corresponding conduction control unit is used to electrically connect the target control circuit.

[0011] As an optional implementation, in the first aspect of this application, the conduction control unit corresponding to each of the battery branches includes a switching device, wherein:

[0012] For each of the battery branches, the first terminal of the corresponding switching device is used to electrically connect the positive terminal of the battery branch and the first terminal of the battery management circuit, respectively, and the second terminal of the corresponding switching device is used to electrically connect the target control circuit.

[0013] As an optional implementation, in the first aspect of this application, the charging control circuit of the battery system further includes a filter circuit, wherein:

[0014] The second terminal of the branch control circuit is used to electrically connect the target control circuit and the first terminal of the filter circuit, respectively, and the second terminal of the filter circuit is used to ground.

[0015] As an optional implementation, in the first aspect of this application, the filtering circuit includes at least one filtering capacitor, wherein:

[0016] When the filter circuit includes a filter capacitor, the first terminal of the filter capacitor is electrically connected to the second terminal of the branch control circuit, and the second terminal of the filter capacitor is used for grounding.

[0017] As an optional implementation, in the first aspect of this application, the charging control circuit of the battery system further includes a current detection circuit, wherein:

[0018] The first terminal of the current detection circuit is electrically connected to the second terminal of the branch control circuit, and the second terminal of the current detection circuit is used to electrically connect to the first terminal of the target control circuit and the filter circuit, respectively.

[0019] The current detection circuit is used to detect the current data of each battery branch in the battery system.

[0020] As an optional implementation, in the first aspect of this application, the current detection circuit includes a current detection unit corresponding to each of the battery branches, wherein:

[0021] For each of the battery branches, the first end of the current detection unit corresponding to the battery branch is electrically connected to the second end of the conduction control unit corresponding to the battery branch, and the second end of the current detection unit corresponding to the battery branch is used to electrically connect to the first end of the target control circuit and the filter circuit, respectively.

[0022] As an optional implementation, in the first aspect of this application, the current detection unit corresponding to each battery branch includes a current sensor, wherein:

[0023] For each of the battery branches, the first end of the current sensor corresponding to the battery branch is electrically connected to the second end of the conduction control unit corresponding to the battery branch, and the second end of the current sensor corresponding to the battery branch is used to electrically connect to the first end of the target control circuit and the filter circuit respectively.

[0024] The third terminal of each current sensor is used for electrical connection to the power supply voltage, and the fourth terminal of each current sensor is used for grounding.

[0025] As an optional implementation, in the first aspect of this application, when the battery system meets preset branch conditions, the battery management circuit includes a first management module and a second management module, wherein:

[0026] The first end of the first management module is electrically connected to the first end of the branch control circuit, the second end of the first management module is used to electrically connect to the signal end of the battery system, the third end of the first management module is electrically connected to the first end of the second management module, and the second end of the second management module is electrically connected to the first end of the signal transmission circuit.

[0027] The second aspect of this application discloses an electronic device, which includes a device body and a charging control circuit for a battery system as disclosed in any of the first aspects.

[0028] Compared with the prior art, this application has the following beneficial effects:

[0029] In this application, the first terminal of the branch control circuit is used to electrically connect to the positive terminal of the battery system and the first terminal of the battery management circuit; the second terminal of the branch control circuit is used to electrically connect to the target control circuit; the second terminal of the battery management circuit is used to electrically connect to the signal terminal of the battery system; the third terminal of the battery management circuit is electrically connected to the first terminal of the signal transmission circuit; the second terminal of the signal transmission circuit is used to connect to the target circuit; the battery system includes at least two battery branches; the battery management circuit is used to control the branch control circuit to disconnect the charging branch corresponding to the target battery branch when it detects that any battery branch in the battery system meets the preset voltage condition, and to transmit a charging process control signal to the target circuit through the signal transmission circuit to adjust the charging process. As can be seen, implementing this application can detect the voltage data of the battery system through the battery management circuit, and when any battery branch meets the preset voltage condition, it can control the branch control circuit to disconnect the target battery branch that meets the preset voltage condition, and transmit the charging process control signal to the target circuit through the signal transmission circuit 103 to adjust the charging process. Based on the real-time voltage monitoring of the battery system, it can achieve precise and efficient adjustment of the charging status of each battery branch of the battery system. Therefore, compared with the prior art, it can adjust the voltage difference between each battery branch at the end of charging with a lower circuit implementation cost. This is beneficial to maintaining the consistency between the cells in the battery system, improving the charging efficiency and charging reliability of the battery system, thereby reducing the possibility of battery system failure, improving the reliability of battery system use, and ultimately improving the user experience. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a charging control circuit for a battery system disclosed in an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the structure of a charging control circuit for another battery system disclosed in an embodiment of this application;

[0033] Figure 3 This is a schematic diagram of the structure of a charging control circuit for another battery system disclosed in an embodiment of this application;

[0034] Figure 4 This is a schematic diagram of the structure of a charging control circuit for another battery system disclosed in an embodiment of this application;

[0035] Figure 5 This is a schematic diagram of the structure of a charging control circuit for another battery system disclosed in an embodiment of this application;

[0036] Figure 6 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of this application. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0038] It should be noted that, unless otherwise expressly specified and limited, the term "electrical connection" in the specification, claims, and accompanying drawings of this application should be interpreted broadly. For example, it can refer to a fixed electrical connection, a detachable electrical connection, or an integral electrical connection; it can be a mechanical electrical connection, an electrical-electrical connection, or a connection capable of communication; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal connection of two elements or the interaction between two elements. Furthermore, the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. The terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] Example 1

[0040] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a charging control circuit for a battery system disclosed in an embodiment of this application. This circuit can be applied to a device equipped with a battery system, or to a vehicle equipped with a battery system; this application embodiment does not limit its application. The battery system may include multiple battery cells. For example, the vehicle equipped with the battery system may be a bus, or other types of vehicles; this application embodiment does not limit its application. Figure 1 As shown, the charging control circuit 10 of the battery system may include a branch control circuit 101, a battery management circuit 102, and a signal transmission circuit 103, wherein:

[0041] The first terminal of the branch control circuit 101 is used to electrically connect to the positive terminal of the battery system and the first terminal of the battery management circuit 102, respectively; the second terminal of the branch control circuit 101 is used to electrically connect to the target control circuit; the second terminal of the battery management circuit 102 is used to electrically connect to the signal terminal of the battery system; the third terminal of the battery management circuit 102 is electrically connected to the first terminal of the signal transmission circuit 103; the battery system includes at least two battery branches;

[0042] The battery management circuit 102 is used to control the branch control circuit 101 to disconnect the charging branch corresponding to the target battery branch when it is detected that any battery branch in the battery system meets the preset voltage condition, and to transmit the charging process control signal to the target circuit through the signal transmission circuit 103 to adjust the charging process.

[0043] Optionally, each battery branch in the battery system may include multiple individual battery cells; optionally, adjacent battery branches may be electrically connected via signal terminals (e.g., signal output terminals and / or signal input terminals), which is not limited in this embodiment; optionally, the signal terminal of the battery system electrically connected to the second terminal of the battery management circuit 102 may be the signal terminal of one of the battery branches of the battery system, which is not limited in this embodiment; further optionally, the second terminal of the battery management circuit 102 and the signal terminal of the battery system may transmit signals through multiple signal transmission channels, the number of which may be determined by the total number of individual battery cells and / or the total number of battery branches, which is not limited in this embodiment.

[0044] The signal terminal of the battery system can be used to collect / detect the voltage data corresponding to the battery system. Furthermore, the voltage data can include the individual cell voltage data corresponding to each cell in each battery branch of the battery system.

[0045] The target control circuit can include controlling the on / off state of the charging path of the battery system. Optionally, the target control circuit can be a vehicle switching device circuit corresponding to the vehicle equipped with the charging control circuit 10 of the battery system, or it can be other circuits. This embodiment does not limit the specific circuit.

[0046] Optionally, the signal transmission circuit 103 can be communicatively connected to the target circuit or electrically connected to the target circuit; this embodiment does not impose any limitations. Please refer to [link / reference]. Figure 4 , Figure 4 This is a schematic diagram of the structure of a charging control circuit for a battery system disclosed in another embodiment of this application, wherein, Figure 4 The described circuit structure uses a battery system comprising two battery branches: a first battery branch and a second battery branch. Optionally, such as... Figure 4 As shown, the signal transmission circuit 103 may include VCU COM (P1-P3), but this embodiment does not limit it.

[0047] The target circuit can be used to control the charging process of the battery system; optionally, the target circuit can be a charging device, a VCU (Vehicle Control Unit), or other control circuits, which are not limited in this embodiment; for example, the charging device can be a charging pile, which is not limited in this embodiment.

[0048] Optionally, when the battery management circuit 102 detects that the highest voltage of any single cell in the battery branch that is in the charging process in the battery system is greater than or equal to a preset voltage threshold based on voltage data, it can determine that the battery branch meets the preset voltage condition and can identify the battery branch as the target battery branch. This embodiment does not limit this. For example, the preset voltage threshold can be 3.65V or other voltage values. This embodiment does not limit this.

[0049] Optionally, the charging process control signal may include a charging request signal or a full charge command signal, which is not limited in this embodiment. The charging request signal is used to instruct the target circuit to perform a charging operation corresponding to the determined charging request current of the battery system. The full charge command signal is used to indicate that all battery branches in the battery system are fully charged, so as to instruct the target circuit to stop charging the battery system. Further optionally, when it is detected that the highest voltage of the single cell corresponding to all battery branches in the battery system is greater than or equal to a preset voltage threshold, the charging process control signal may be a full charge command signal.

[0050] Alternatively, the above-mentioned charging request current can be determined by the following formula: Charging request current = Number of branches currently charging online N * Min 各支路充电请求电流 This embodiment is not limited.

[0051] As can be seen, the embodiments of this application provide a simple and easy-to-implement circuit that can detect the voltage data of the battery system through the battery management circuit. When any battery branch meets the preset voltage condition, the branch control circuit can be controlled to disconnect the target battery branch that meets the preset voltage condition. The charging process control signal is transmitted to the target circuit through the signal transmission circuit 103 to adjust the charging process. Based on real-time voltage monitoring of the battery system, the charging status of each battery branch of the battery system can be accurately and efficiently adjusted. Compared with the prior art, with a lower circuit implementation cost, the voltage difference between each battery branch can be adjusted at the end of the charging process. This is beneficial to maintaining the consistency between the cells in the battery system, improving the charging efficiency and charging reliability of the battery system, thereby reducing the possibility of battery system failure and improving the reliability of battery system use, which in turn improves the user experience.

[0052] In an optional embodiment, please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of a charging control circuit for another battery system disclosed in an embodiment of this application, wherein, Figure 2 The described circuit structure uses a battery system comprising two battery branches as an example. Optional, such as... Figure 2 As shown, the branch control circuit 101 may include a conduction control unit 1011 corresponding to each battery branch, wherein:

[0053] For each battery branch, the first terminal of the corresponding conduction control unit 1011 is used to electrically connect the positive terminal of the battery branch and the first terminal of the battery management circuit 102, respectively, and the second terminal of the corresponding conduction control unit 1011 is used to electrically connect the target control circuit.

[0054] The conduction control unit 1011 corresponding to each battery branch can be used to control the conduction / disconnection of the charging branch corresponding to each battery branch.

[0055] As can be seen, this optional embodiment can set a corresponding conduction control unit for each battery branch in the branch control circuit, which can improve the control flexibility and accuracy of the branch switching of each battery branch in the battery system. Moreover, when the battery management circuit detects that any battery branch meets the preset voltage condition, it can more flexibly disconnect the target battery branch, thereby improving the control flexibility and efficiency of the charging process of the battery system, and thus helping to improve the charging efficiency and charging reliability of the battery system.

[0056] In this optional embodiment, optionally, such as Figure 4 As shown, the conduction control unit 1011 corresponding to each battery branch may include a switching device, wherein:

[0057] For each battery branch, the first terminal of the corresponding switching device is used to electrically connect the positive terminal of the battery branch and the first terminal of the battery management circuit 102, respectively, and the second terminal of the corresponding switching device is used to electrically connect the target control circuit.

[0058] Optionally, the switching device included in the conduction control unit 1011 needs to support the function of cutting off under low current load; further optionally, the switching device can be a relay or other types of switching devices, which is not limited in this embodiment.

[0059] Please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of a charging control circuit for a battery system disclosed in an embodiment of this application, which is exemplary, such as... Figure 5As shown, the switching devices included in the conduction control unit 1011 corresponding to the first battery branch can be... Figure 5 The relay KB1 RELAY shown, the switching device included in the conduction control unit 1011 corresponding to the second battery branch can be... Figure 5 The relay KB2 RELAY shown is not limited in this embodiment.

[0060] It is evident that by setting switching devices in each conduction control unit, the on / off control efficiency and control flexibility for each battery branch can be improved, which is conducive to more flexible adjustment of the battery system charging process.

[0061] In this optional embodiment, optionally, such as Figure 2 As shown, the charging control circuit 10 of the battery system may further include a filter circuit 104, wherein:

[0062] The second terminal of the branch control circuit 101 is used to electrically connect the target control circuit and the first terminal of the filter circuit 104, respectively. The second terminal of the filter circuit 104 is used to ground.

[0063] The filter circuit 104 can be used to filter the signals detected / to be transmitted in the charging control circuit 10 of the battery system.

[0064] It is evident that by adding a filter circuit to the charging control circuit of the battery system, signal interference in the charging control circuit can be reduced, thereby improving the accuracy of the signals detected / to be transmitted in the charging control circuit, and further improving the signal transmission accuracy in the charging control circuit.

[0065] In this optional embodiment, the filter circuit 104 may optionally include at least one filter capacitor, wherein:

[0066] When the filter circuit 104 includes a filter capacitor, the first end of the filter capacitor is electrically connected to the second end of the branch control circuit 101, and the second end of the filter capacitor is used for grounding.

[0067] Optionally, when the filter circuit 104 includes at least two filter capacitors, multiple filter capacitors can be connected in series and / or in parallel, which is not limited in this embodiment.

[0068] Among them, optional, such as Figure 5 As shown, the filter circuit 104 may include a first capacitor C1, wherein:

[0069] The first terminal of the first capacitor C1 is electrically connected to the second terminal of the branch control circuit 101, and the second terminal of the first capacitor C1 is used for grounding.

[0070] It is evident that by setting at least one filter capacitor in the filter circuit to achieve the filtering function, the cost of the filter circuit can be reduced, and the filtering efficiency of the signal can be improved, thereby improving the signal accuracy.

[0071] In this optional embodiment, optionally, such as Figure 2 As shown, the charging control circuit 10 of the battery system may further include a current detection circuit 105, wherein:

[0072] The first terminal of the current detection circuit 105 is electrically connected to the second terminal of the branch control circuit 101, and the second terminal of the current detection circuit 105 is used to electrically connect to the first terminal of the target control circuit and the filter circuit 104, respectively.

[0073] The current detection circuit 105 is used to detect the current data of each battery branch in the battery system.

[0074] It is evident that by adding a current detection circuit to the charging control circuit of the battery system, the current detection function of the battery system and its corresponding charging branch can be realized, which can improve the comprehensiveness of data monitoring of the battery system. This is conducive to a more comprehensive analysis of the charging status of the battery system by combining current data, and improves the control accuracy of the charging process of the battery system.

[0075] In this optional embodiment, optionally, such as Figure 2 As shown, the current detection circuit 105 may include a current detection unit 1051 corresponding to each battery branch, wherein:

[0076] For each battery branch, the first end of the current detection unit 1051 corresponding to the battery branch is electrically connected to the second end of the conduction control unit 1011 corresponding to the battery branch. The second end of the current detection unit 1051 corresponding to the battery branch is used to electrically connect to the first end of the target control circuit and the filter circuit 104, respectively.

[0077] The current detection unit 1051 corresponding to each battery branch can be used to detect the current data of that battery branch.

[0078] It is evident that by setting up a corresponding current detection unit for each battery branch in the current detection circuit, the accuracy of monitoring the branch current data of each battery branch in the battery system can be improved, thereby improving the accuracy of data monitoring of the battery system.

[0079] In this optional embodiment, optionally, such as Figure 4 As shown, the current detection unit 1051 corresponding to each battery branch may include a current sensor, wherein:

[0080] For each battery branch, the first end of the current sensor corresponding to the battery branch is electrically connected to the second end of the conduction control unit 1011 corresponding to the battery branch. The second end of the current sensor corresponding to the battery branch is used to electrically connect to the first end of the target control circuit and the filter circuit 104, respectively.

[0081] The third terminal of each current sensor is used for electrical connection to the power supply voltage, and the fourth terminal of each current sensor is used for grounding.

[0082] The fifth terminal of each current sensor can be used to output a current detection signal; optionally, this current detection signal can be output to, for example... Figure 4 The vehicle accessory shown can be processed, or the output can be sent to the battery management circuit 102, or to other circuit structures. This embodiment does not limit the output. Alternatively, the vehicle accessory can be an insulation detector. This embodiment does not limit the output.

[0083] Optionally, the current sensor included in the current detection unit 1051 can be a Hall current sensor or other types of current sensors; this embodiment does not limit the specific type of current sensor.

[0084] For example, such as Figure 5 As shown, the current sensor included in the current detection unit 1051 corresponding to the first battery branch can be... Figure 5 The Hall current sensor CT1 shown, and the current detection unit 1051 corresponding to the second battery branch, can include a current sensor that can be... Figure 5 The Hall current sensor CT2 is shown; wherein, the pins CH1 and CH2 of the Hall current sensors CT1 and CT2 can be used to output current detection signals, which is not limited in this embodiment.

[0085] It is evident that by setting a current sensor in each current detection unit, the current detection efficiency and accuracy for each battery branch can be improved, thereby further enhancing the accuracy of data monitoring for the battery system.

[0086] In this embodiment, for example, other circuit structures related to the charging control circuit of the battery system and the connection relationships between these related circuit structures are specifically described in reference to... Figure 4 .

[0087] In another optional embodiment, when the battery system meets preset branch conditions, the battery management circuit 102 includes a first management module 1021 and a second management module 1022, wherein:

[0088] The first terminal of the first management module 1021 is electrically connected to the first terminal of the branch control circuit 101. The second terminal of the first management module 1021 is used to electrically connect to the signal terminal of the battery system. The third terminal of the first management module 1021 is electrically connected to the first terminal of the second management module 1022. The second terminal of the second management module 1022 is electrically connected to the first terminal of the signal transmission circuit 103.

[0089] Optionally, when the number of battery branches in the battery system is greater than or equal to the preset number of branches, the battery system can be determined to meet the preset branch condition; further optionally, the preset number of branches can be 3 or other numbers, which is not limited in this embodiment.

[0090] Optionally, when the battery system does not meet the preset branch conditions, the battery management circuit 102 may include only one management module; this embodiment does not impose any limitations on this.

[0091] Further optional, such as Figure 4 As shown, the management module described in this optional embodiment may include a BMS (Battery Management System), but this embodiment does not limit it.

[0092] As can be seen, this optional embodiment can adjust the configuration of the battery management circuit according to the number of battery branches set in the battery system. Specifically, when the battery system meets the preset branch conditions, a first management module and a second management module can be set in the battery management circuit, which can improve the efficiency and accuracy of processing and transmitting various signals such as detection signals, control signals, and request signals. This is conducive to more accurate and efficient monitoring of the battery system, which in turn facilitates more accurate and efficient adjustment of the corresponding charging process of the battery system, thereby improving the charging efficiency and charging reliability of the battery system.

[0093] The working principle of the charging control circuit of the battery system in this embodiment is as follows:

[0094] During the charging process of the battery system, the battery management circuit 102 detects the voltage data corresponding to the battery system through the signal terminal of the battery system. When the battery management circuit 102 detects that the highest voltage of each cell in each branch is less than the preset voltage threshold, it continuously sends a charging request to the charging pile or VCU through the signal transmission circuit 103 according to the minimum allowable charging current of each branch multiplied by the number of branches n. When the battery management circuit 102 detects that the highest voltage of any cell in any battery branch is greater than or equal to the preset voltage threshold, it controls the corresponding conduction control unit in the branch control circuit 101 to disconnect the battery branch and sends a charging request to the charging pile or VCU through the signal transmission circuit 103 according to the number of branches N currently charging online and the minimum allowable charging current of each branch. If the battery management circuit 102 further determines that the highest voltage of each cell in all battery branches in the battery system is greater than or equal to the preset voltage threshold, it sends a full charge command to the charging pile or VCU through the signal transmission circuit 103 to end the charging process.

[0095] It should be noted that this strategy should not be triggered during the high-current charging phase of the battery system to avoid causing relay sticking.

[0096] Example 2

[0097] Please see Figure 6 , Figure 6 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of this application. The electronic device includes a charging control circuit for a battery system as described in any of the embodiments in Example 1. The functions that the electronic device can perform include, but are not limited to, controlling the charging process of each battery branch in the battery system. It should be noted that for a detailed description of the charging control circuit of the battery system, please refer to the specific description in Example 1; it will not be repeated in this embodiment.

[0098] It is evident that implementation Figure 6 The described electronic device can detect the voltage data of the battery system through the battery management circuit. When any battery branch meets the preset voltage condition, it can control the branch control circuit to disconnect the target battery branch that meets the preset voltage condition. It also transmits a charging process control signal to the target circuit through the signal transmission circuit 103 to adjust the charging process. Based on real-time voltage monitoring of the battery system, it can accurately and efficiently adjust the charging status of each battery branch of the battery system. Compared with the prior art, it can adjust the voltage difference between each battery branch at the end of charging with lower circuit implementation cost. This helps to maintain the consistency between the cells in the battery system, improve the charging efficiency and charging reliability of the battery system, reduce the possibility of battery system failure, improve the reliability of battery system use, and thus improve the user experience.

[0099] Finally, it should be noted that the charging control circuit and electronic device for a battery system disclosed in the embodiments of this application are merely preferred embodiments of this application and are only used to illustrate the technical solutions of this application, not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A charging control circuit for a battery system, characterized in that, The charging control circuit of the battery system includes a branch control circuit (101), a battery management circuit (102), and a signal transmission circuit (103), wherein: The first terminal of the branch control circuit (101) is used to electrically connect to the positive terminal of the battery system and the first terminal of the battery management circuit (102); the second terminal of the branch control circuit (101) is used to electrically connect to the target control circuit; the second terminal of the battery management circuit (102) is used to electrically connect to the signal terminal of the battery system; the third terminal of the battery management circuit (102) is electrically connected to the first terminal of the signal transmission circuit (103); the battery system includes at least two battery branches; The battery management circuit (102) is used to control the branch control circuit (101) to disconnect the charging branch corresponding to the target battery branch when it is detected that any of the battery branches in the battery system meets the preset voltage conditions, and to transmit the charging process control signal to the target circuit through the signal transmission circuit (103) to adjust the charging process.

2. The charging control circuit of the battery system according to claim 1, characterized in that, The branch control circuit (101) includes a conduction control unit (1011) corresponding to each of the battery branches, wherein: For each of the battery branches, the first terminal of the corresponding conduction control unit (1011) is used to electrically connect the positive terminal of the battery branch and the first terminal of the battery management circuit (102), and the second terminal of the corresponding conduction control unit (1011) is used to electrically connect the target control circuit.

3. The charging control circuit of the battery system according to claim 2, characterized in that, Each of the battery branch corresponding to the conduction control unit (1011) includes a switching device, wherein: For each of the battery branches, the first terminal of the corresponding switching device is used to electrically connect the positive terminal of the battery branch and the first terminal of the battery management circuit (102), and the second terminal of the corresponding switching device is used to electrically connect the target control circuit.

4. The charging control circuit of the battery system according to claim 2 or 3, characterized in that, The charging control circuit of the battery system further includes a filter circuit (104), wherein: The second terminal of the branch control circuit (101) is used to electrically connect the target control circuit and the first terminal of the filter circuit (104), respectively, and the second terminal of the filter circuit (104) is used to ground.

5. The charging control circuit of the battery system according to claim 4, characterized in that, The filter circuit (104) includes at least one filter capacitor, wherein: When the filter circuit (104) includes a filter capacitor, the first end of the filter capacitor is electrically connected to the second end of the branch control circuit (101), and the second end of the filter capacitor is used for grounding.

6. The charging control circuit of the battery system according to claim 4, characterized in that, The charging control circuit of the battery system further includes a current detection circuit (105), wherein: The first end of the current detection circuit (105) is electrically connected to the second end of the branch control circuit (101), and the second end of the current detection circuit (105) is used to electrically connect the first end of the target control circuit and the first end of the filter circuit (104); The current detection circuit (105) is used to detect the current data of each battery branch in the battery system.

7. The charging control circuit of the battery system according to claim 6, characterized in that, The current detection circuit (105) includes a current detection unit (1051) corresponding to each of the battery branches, wherein: For each of the battery branches, the first end of the current detection unit (1051) corresponding to the battery branch is electrically connected to the second end of the conduction control unit (1011) corresponding to the battery branch, and the second end of the current detection unit (1051) corresponding to the battery branch is used to electrically connect to the first end of the target control circuit and the filter circuit (104).

8. The charging control circuit of the battery system according to claim 7, characterized in that, Each of the battery branch corresponding to the current detection unit (1051) includes a current sensor, wherein: For each of the battery branches, the first end of the current sensor corresponding to the battery branch is electrically connected to the second end of the conduction control unit (1011) corresponding to the battery branch, and the second end of the current sensor corresponding to the battery branch is used to electrically connect to the first end of the target control circuit and the filter circuit (104). The third terminal of each current sensor is used for electrical connection to the power supply voltage, and the fourth terminal of each current sensor is used for grounding.

9. The charging control circuit of the battery system according to any one of claims 1, 2, 3, 5, 6, 7, and 8, characterized in that, When the battery system meets the preset branch conditions, the battery management circuit (102) includes a first management module (1021) and a second management module (1022), wherein: The first end of the first management module (1021) is electrically connected to the first end of the branch control circuit (101), the second end of the first management module (1021) is used to electrically connect to the signal end of the battery system, the third end of the first management module (1021) is electrically connected to the first end of the second management module (1022), and the second end of the second management module (1022) is electrically connected to the first end of the signal transmission circuit (103).

10. An electronic device, characterized in that, The electronic device includes a device body and a charging control circuit for the battery system as described in any one of claims 1-9.

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