Battery cell detection system and method

Abstract

The invention discloses a battery cell detection system and method, relates to the technical field of vehicles, and aims to improve the acquisition efficiency of single battery cell data. The battery cell detection system comprises a controller, a plurality of acquisition loops, a battery assembly and an input / output (IO) expansion circuit, each acquisition loop in the plurality of acquisition loops comprises a first acquisition board and a second acquisition board; the controller is respectively connected with a first port of the first acquisition board and a first port of the second acquisition board through the IO expansion circuit, and a second port of the first acquisition board is connected with a second port of the second acquisition board; wherein the first acquisition board and the second acquisition board are used for acquiring cell data of different cells in the battery assembly; the IO expansion circuit is used for expanding the number of IO ports of the controller.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a battery cell detection system and method. Background Art

[0002] With the development of new energy technologies, the types of new energy vehicles are becoming increasingly diverse (such as passenger cars, logistics vehicles, communication vehicles, special vehicles, etc.). Since new energy vehicles use power batteries as their main power supply system, people's demands for the range and power of power batteries are becoming increasingly higher.

[0003] To increase the range of power batteries, more cells can be added to the battery pack of new energy vehicles. However, this will increase the time required to collect cell data and make it impossible to ensure the immediacy and synchronization of cell data. Summary of the Invention

[0004] The object of the present invention is to provide a battery cell detection system and method to improve the efficiency of collecting battery cell data.

[0005] In a first aspect, a battery cell detection system is provided, which includes: a controller, multiple acquisition loops, a battery assembly, and an input and output IO expansion circuit; each of the multiple acquisition loops includes a first acquisition board and a second acquisition board; the controller is connected to the first port of the first acquisition board and the first port of the second acquisition board respectively through the IO expansion circuit, and the second port of the first acquisition board is connected to the second port of the second acquisition board; wherein the first acquisition board and the second acquisition board are used to collect cell data of different battery cells in the battery assembly; the IO expansion circuit is used to expand the number of IO ports of the controller.

[0006] Based on the technical solution provided in the present application, the battery cell detection system can be set up with multiple acquisition loops and IO expansion circuits. Since the controller is connected to the first port of the first acquisition board and the first port of the second acquisition board in the acquisition loop through the IO expansion circuit, the IO expansion circuit has a communication method similar to broadcasting, and the controller can interact with the acquisition board in the acquisition loop synchronously and independently; in this way, it can be ensured that the acquisition board in each acquisition loop can synchronously receive the acquisition signal from the controller, so that the acquisition board synchronously collects the battery cell data in the battery assembly, and the acquisition board synchronously sends the battery cell data to the controller, without the need to interact with different acquisition boards one by one, thereby reducing the time for collecting battery cell data, improving the efficiency of collecting battery cell data, and ensuring the immediacy and synchronization of battery cell data.

[0007] Furthermore, the second acquisition board is also provided with a second port, and the controller is connected to the second port of the second acquisition board through the IO expansion circuit.

[0008] Furthermore, the battery cell detection system also includes a bridge circuit arranged between the controller and the acquisition loop; the bridge circuit is used to convert the first communication protocol into the second communication protocol, or to convert the second communication protocol into the first communication protocol; the first communication protocol is the protocol configured by the acquisition loop, and the second communication protocol is the protocol configured by the controller.

[0009] Furthermore, the bridge circuit is configured with a sending serial peripheral interface SPI and a receiving SPI; the sending SPI is used to send control instructions from the controller to the acquisition loop; the receiving SPI is used to send the battery cell data collected by the acquisition loop to the controller; the control instructions are used to instruct the acquisition loop to collect the battery cell data.

[0010] Furthermore, the bridge circuit includes a main bridge circuit and an auxiliary bridge circuit; the main bridge circuit is arranged between the first acquisition board and the controller; and the auxiliary bridge circuit is arranged between the second acquisition board and the controller.

[0011] Furthermore, for any acquisition board in the acquisition loop, a plurality of acquisition circuits are provided on the acquisition board, and different acquisition circuits are used to acquire cell data of different cells in the battery assembly.

[0012] Furthermore, the multiple acquisition circuits in the acquisition loop are connected end to end in sequence through a daisy chain.

[0013] Furthermore, the battery cell data includes at least one of the following: temperature and voltage.

[0014] In a second aspect, a battery cell detection method is provided, which is applied to a controller in a battery cell detection system such as any one of the first aspects; the method includes: when a first bridge circuit of an acquisition loop is in an open state and a second bridge circuit is in a closed state, if an acquisition loop is in an abnormal state, controlling the second bridge circuit to be in an open state; the first bridge circuit is any one of a main bridge circuit and an auxiliary bridge circuit; the second bridge circuit is different from the first bridge circuit; the acquisition loop being in an abnormal state indicates that there is an abnormal acquisition circuit in the acquisition loop.

[0015] Furthermore, the cell data also includes identifiers of multiple acquisition circuits, and control instructions are sent to the two ports of the acquisition loop through the main bridge circuit and the auxiliary bridge circuit respectively; the cell data is received from the two ports of the acquisition loop; the abnormal acquisition circuit is determined from the multiple acquisition circuits in the acquisition loop based on the cell data; the identifier of the abnormal acquisition circuit is not in the cell data.

[0016] Beneficial effects of the present invention:

[0017] (1) Based on the technical solution provided in the present application, a battery cell detection system can be provided with multiple acquisition loops and IO expansion circuits. Since the controller is connected to the first port of the first acquisition board and the first port of the second acquisition board in the acquisition loop respectively through the IO expansion circuit, the IO expansion circuit has a communication method similar to broadcasting, and the controller can interact with the acquisition boards in the acquisition loop synchronously and independently. In this way, it can be ensured that the acquisition board in each acquisition loop can synchronously receive the acquisition signal from the controller, so that the acquisition board synchronously collects the battery cell data in the battery assembly, and the acquisition board synchronously sends the battery cell data to the controller, without having to interact with different acquisition boards one by one, thereby reducing the time for collecting battery cell data, improving the efficiency of collecting battery cell data, and ensuring the immediacy and synchronization of battery cell data.

[0018] (2) By setting a second port on the second acquisition board, the controller can be connected to the second port of the second acquisition board through the IO expansion circuit. This is equivalent to adding a backup communication link to the acquisition loop, avoiding the situation where the lower-level acquisition circuit of the abnormal acquisition circuit cannot send cell data to the controller when there is an abnormal acquisition circuit in the acquisition loop, thereby improving the reliability of the acquisition loop.

[0019] (3) By setting up a bridge circuit, the communication protocol between the controller and the acquisition loop can be converted to ensure normal interaction between the controller and the acquisition loop.

[0020] (4) By setting the serial peripheral interface SPI and the receiving SPI, the interaction function between the bridge circuit configuration and the acquisition loop, as well as the interaction function between the bridge circuit and the controller, can be enabled to ensure that the controller can receive the battery cell data.

[0021] (5) By setting the main bridge circuit and the auxiliary bridge circuit, different bridge circuits can be turned on and off to improve the flexibility of battery cell data collection.

[0022] (6) By setting up multiple acquisition circuits, since different acquisition circuits are used to collect cell data of different cells in the battery assembly, the time for collecting cell data can be reduced, thereby improving the efficiency of collecting cell data.

[0023] (7) By setting up a daisy chain, one signal line can be used to transmit signals between different acquisition circuits, reducing the deployment cost of the battery cell detection system.

[0024] (8) By collecting the temperature of the battery cell, the temperature changes can be identified, thereby improving the safety of the power battery; by collecting the voltage of the battery cell, the voltage changes can be identified, thereby reflecting the changes in the battery power.

[0025] (9) When one acquisition loop is in an abnormal state, the control bridge circuit is changed from one in the open state to two in the open state; in this way, the acquisition circuit can transmit the cell data through the two bridge circuits, avoiding the situation where one acquisition loop is abnormal and some acquisition circuits cannot send cell data to the controller.

[0026] (10) By receiving cell data from both ends of the acquisition loop and obtaining the corresponding acquisition circuit identifier from the cell data, the acquisition circuit that has not reported the cell data can be determined, that is, the abnormal acquisition circuit can be determined.

[0027] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application, and do not constitute an improper limitation on the present application.

[0029] Figure 1 A schematic structural diagram of a battery cell detection system provided in an embodiment of the present application;

[0030] Figure 2 A schematic structural diagram of another battery cell detection system provided in an embodiment of the present application;

[0031] Figure 3 A flowchart of a battery cell detection method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to enable ordinary people in the art to better understand the technical solutions of the present disclosure, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0033] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the numbers used in this manner are interchangeable where appropriate so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the embodiments of the present application as detailed in the appended claims.

[0034] It will also be understood that the term “comprising” indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements and / or components.

[0035] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0036] With the development of new energy technologies, the types of new energy vehicles are becoming increasingly diverse (such as passenger cars, logistics vehicles, communication vehicles, special vehicles, etc.). Since new energy vehicles use power batteries as their main power supply system, people's demands for the range and power of power batteries are becoming increasingly higher.

[0037] To increase the range of power batteries, more cells can be added to the battery pack of new energy vehicles. However, this will increase the time required to collect cell data and make it impossible to ensure the immediacy and synchronization of cell data.

[0038] In view of this, an embodiment of the present application provides a battery cell detection system, which includes: a controller, multiple acquisition loops, a battery assembly, and an input and output IO expansion circuit; each of the multiple acquisition loops includes a first acquisition board and a second acquisition board; the controller is connected to the first port of the first acquisition board and the first port of the second acquisition board through the IO expansion circuit, and the second port of the first acquisition board is connected to the second port of the second acquisition board; wherein the first acquisition board and the second acquisition board are used to collect battery cell data of different battery cells in the battery assembly; the IO expansion circuit is used to expand the number of IO ports of the controller.

[0039] It should be noted that the battery cell detection system described in the embodiment of the present application is intended to more clearly illustrate the technical solution of the embodiment of the present application, and does not constitute a limitation on the technical solution provided in the embodiment of the present application. Ordinary technicians in this field can know that with the evolution of the battery cell detection system and the emergence of other battery cell detection systems, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.

[0040] The battery cell detection system provided in the embodiments of the present application can be applied to vehicles. The embodiments of the present application do not limit the specific technology, specific quantity, and specific equipment form used in the vehicle. For example, the vehicle can be a new energy vehicle, a hybrid vehicle (such as an extended-range vehicle), etc. The embodiments of the present application do not limit the specific technology, specific quantity, and specific equipment form used in the vehicle.

[0041] Figure 1 A schematic diagram of the structure of a battery cell detection system provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the battery cell detection system may include a controller 11 , multiple acquisition loops 12 , a battery assembly 13 , and an input / output (IO) expansion circuit 14 .

[0042] Among them, each acquisition loop 12 in the multiple acquisition loops 12 includes a first acquisition board and a second acquisition board; the controller 11 is connected to the first port of the first acquisition board and the first port of the second acquisition board through the IO expansion circuit 14, and the second port of the first acquisition board is connected to the second port of the second acquisition board.

[0043] The first acquisition board and the second acquisition board are used to collect cell data of different cells in the battery assembly 13 ; and the IO expansion circuit 14 is used to expand the number of IO ports of the controller 11 .

[0044] The controller 11 may be a microcontroller unit (MCU).

[0045] It should be noted that the type of cell data can be set as needed, for example, temperature, voltage, etc.

[0046] In one possible embodiment, Figure 2 A structural diagram of another battery cell detection system provided in an embodiment of the present application is shown as follows: Figure 2 As shown, the battery cell detection system may further include a bridge circuit 15 disposed between the controller 11 and the acquisition loop 12 .

[0047] The bridge circuit 15 is used to convert the first communication protocol into the second communication protocol, or to convert the second communication protocol into the first communication protocol; the first communication protocol is the protocol configured by the acquisition loop 12, and the second communication protocol is the protocol configured by the controller 11.

[0048] For example, upon receiving a control instruction of a first communication protocol from the controller, the bridge circuit may convert the control instruction of the first communication protocol into a control instruction of a second communication protocol, and send the control instruction of the second communication protocol to the acquisition loop.

[0049] When receiving a control instruction of the second communication protocol from the acquisition loop, the bridge circuit may convert the control instruction of the second communication protocol into a control instruction of the first communication protocol and send the control instruction of the first communication protocol to the controller.

[0050] In a possible embodiment, the bridge circuit 15 is configured with a transmitting serial peripheral interface SPI and a receiving SPI.

[0051] The sending SPI is used to send the control instruction from the controller 11 to the acquisition loop 12; the receiving SPI is used to send the cell data collected by the acquisition loop 12 to the controller 11; the control instruction is used to instruct the acquisition loop 12 to collect the cell data.

[0052] In one example, the bridge circuit 15 may include a main bridge circuit and an auxiliary bridge circuit; the auxiliary bridge circuit is provided between the second acquisition board and the controller 11 .

[0053] In one possible embodiment, Figure 2 As shown, the second acquisition board is further provided with a second port, and the controller 11 is connected to the second port of the second acquisition board through the IO expansion circuit 14 .

[0054] In one possible embodiment, Figure 2 As shown, for any acquisition board in the acquisition loop, a plurality of acquisition circuits are provided on the acquisition board.

[0055] Different acquisition circuits are used to collect cell data from different cells in the battery assembly. The type of acquisition circuit can be set as needed. For example, it can be an analog front end (AFE).

[0056] For example, the first acquisition board in first acquisition loop 121 may include AFE1, AFE2, AFE3, and AFE4; the second acquisition board in first acquisition loop 121 may include AFE5, AFE6, AFE7, and AFE8. The first acquisition board in second acquisition loop 122 may include AFE9, AFE10, AFE11, and AFE12; the second acquisition board in second acquisition loop 122 may include AFE13, AFE14, AFE15, and AFE16.

[0057] Among them, multiple acquisition circuits in the acquisition loop are connected in sequence end to end through a daisy chain.

[0058] For example, the main bridge circuit in the first acquisition loop 121 can be connected to AFE1 via a daisy chain, and then AFE1 is sequentially connected to AFE8; AFE8 is connected to the auxiliary bridge circuit via a daisy chain. The main bridge circuit in the second acquisition loop 122 can be connected to AFE9 via a daisy chain, and then AFE9 is sequentially connected to AFE16; AFE16 is connected to the auxiliary bridge circuit via a daisy chain.

[0059] In some embodiments, the multiple acquisition loops may further include other acquisition loops, and this application does not limit the number of acquisition loops.

[0060] The process of collecting battery cell data is introduced below. The process of collecting battery cell data may include the following S1-S4.

[0061] S1: The controller sends a control instruction to the input / output (IO) expansion circuit. Correspondingly, the IO expansion circuit receives the control instruction from the controller.

[0062] The control instruction is used to instruct the acquisition loop to collect cell data.

[0063] S2. The IO expansion circuit sends control instructions to the multiple acquisition loops. Correspondingly, the multiple acquisition loops receive the control instructions from the IO expansion circuit.

[0064] As a possible implementation manner, the IO expansion circuit can send control instructions to multiple acquisition loops through a preset communication line.

[0065] It should be noted that the preset communication line can be set as needed. For example, it can be a daisy chain (a twisted pair chain) or the like.

[0066] Combine Figure 1 The IO expansion circuit 14 can send control instructions to the acquisition loop 121 through the first port of the first acquisition board 1211; and send control instructions to the acquisition loop 122 through the first acquisition board 1221.

[0067] As another possible implementation, the IO expansion circuit may send control instructions to multiple acquisition loops through a preset communication line and a bridge circuit.

[0068] In some embodiments, the control instruction may further include a chip select signal (Chip Select, CS).

[0069] Among them, the chip select signal is used to determine the operating status of the bridge circuit.

[0070] For example, when the chip select signal includes the transmit SPI and the receive SPI of the main bridge circuit, the operation state of the main bridge circuit is the on state, and the operation state of the auxiliary bridge circuit is the off state.

[0071] Combine Figure 2 The IO expansion circuit 14 can send a control instruction to the first port of the first acquisition board 1211 through the main bridge circuit to send a control instruction to the acquisition loop 121; the IO expansion circuit 14 can send a control instruction to the first port of the first acquisition board 1221 through the main bridge circuit to send a control instruction to the acquisition loop 122.

[0072] For another example, when the chip select signal includes the transmit SPI and the receive SPI of the auxiliary bridge circuit, the operation state of the main bridge circuit is the off state, and the operation state of the auxiliary bridge circuit is the on state.

[0073] Combine Figure 2The IO expansion circuit 14 can send a control instruction to the second port of the second acquisition board 1212 through the auxiliary bridge circuit to send a control instruction to the acquisition loop 121. The IO expansion circuit 14 can send a control instruction to the second port of the second acquisition board 1222 through the auxiliary bridge circuit to send a control instruction to the acquisition loop 122.

[0074] For another example, when the chip select signal includes the transmit SPI and receive SPI of the auxiliary bridge circuit, and the transmit SPI and receive SPI of the auxiliary bridge circuit, the operating state of the main bridge circuit is on and the operating state of the auxiliary bridge circuit is on.

[0075] Combine Figure 2 The IO expansion circuit 14 can send a control instruction to the first port of the first acquisition board 1211 through the main bridge circuit, and send a control instruction to the second port of the second acquisition board 1212 through the auxiliary bridge circuit, thereby sending a control instruction to the acquisition loop 121. The IO expansion circuit can send a control instruction to the first port of the first acquisition board 1221 through the main bridge circuit, and send a control instruction to the second port of the second acquisition board 1222 through the auxiliary bridge circuit, thereby sending a control instruction to the acquisition loop 122.

[0076] S3. Multiple collection loops collect cell data of different cells in the battery assembly.

[0077] As a possible implementation manner, a plurality of acquisition circuits are provided on an acquisition board in the acquisition loop, and the acquisition loop can acquire cell data of different cells in the battery assembly through the plurality of acquisition circuits.

[0078] Each acquisition circuit can be used to collect data from one or more battery cells, and each acquisition circuit collects data from different battery cells.

[0079] Combine Figure 1 The battery assembly 13 may include a first cell, a second cell, a third cell, and a fourth cell. The acquisition loop 121 may collect cell data of the second cell via the first acquisition board 1211 and collect cell data of the first cell via the second acquisition board 1212. The acquisition loop 122 may collect cell data of the third cell via the first acquisition board 1221 and collect cell data of the fourth cell via the second acquisition board 1222.

[0080] S4. Multiple acquisition loops send cell data to the controller.

[0081] As a possible implementation manner, the acquisition loop may send the cell data to the controller through the first port of the first acquisition board.

[0082] Combine Figure 1The acquisition loop 121 can send the cell data to the IO expansion circuit through the first port of the first acquisition board 1211, and the acquisition loop 122 can send the cell data to the IO expansion circuit 14 through the first port of the first acquisition board 1221. Further, the IO expansion circuit 14 receives the cell data and sends the cell data to the controller 11.

[0083] As another possible implementation, the acquisition loop may send the cell data to the controller through the second port of the second acquisition board.

[0084] Combine Figure 2 The acquisition loop 121 can send the cell data to the IO expansion circuit 14 through the second port of the second acquisition board 1212 and the auxiliary bridge circuit, and the acquisition loop 122 can send the cell data to the IO expansion circuit 14 through the second port of the second acquisition board 1222. Further, the IO expansion circuit 14 receives the cell data and sends the cell data to the controller 11.

[0085] The acquisition loop 121 can send cell data to the IO expansion circuit 14 through the first port of the first acquisition board 1211, and the acquisition loop 122 can send cell data to the IO expansion circuit 14 through the first port of the first acquisition board 1221. Further, the IO expansion circuit 14 receives the cell data and sends the cell data to the controller 11.

[0086] As another possible implementation, the acquisition loop may also send the cell data to the controller through the first port of the first acquisition board and the second port of the second acquisition board.

[0087] Combine Figure 2 The acquisition loop 121 can send the cell data to the controller 11 through the first line and the second line. The acquisition loop 122 can send the cell data to the controller 11 through the third line and the fourth line.

[0088] The first circuit includes: the first port of the first acquisition board 1211 - the primary bridge circuit - the I / O expansion circuit 14 - the controller 11. The second circuit includes: the second port of the second acquisition board 1212 - the auxiliary bridge circuit - the I / O expansion circuit 14 - the controller 11. The third circuit includes: the first port of the first acquisition board 1221 - the primary bridge circuit - the I / O expansion circuit 14 - the controller 11. The fourth circuit includes: the second port of the second acquisition board 1222 - the auxiliary bridge circuit - the I / O expansion circuit 14 - the controller 11.

[0089] It should be noted that the cell data collected by the collection circuit in the collection loop is transmitted step by step through a daisy chain, and the cell data collected by each collection circuit can send the collected cell data to the upper-level collection circuit.

[0090] For example, when the main bridge circuit is in an on state and the auxiliary bridge circuit is in an off state, the upper level acquisition circuit of AFE2 may be AFE1, and the upper level acquisition circuit of AFE3 may be AFE2.

[0091] For another example, when the main bridge circuit is in the off state and the auxiliary bridge circuit is in the on state, the upper-level acquisition circuit of AFE2 may be AFE3, and the upper-level acquisition circuit of AFE3 may be AFE4.

[0092] For another example, when the main bridge circuit is in the on state and the auxiliary bridge circuit is in the on state, if AFE4 is abnormal, the upper acquisition circuit of AFE5 may be AFE6, and the upper acquisition circuit of AFE3 may be AFE2.

[0093] The following describes a cell detection method used in the above cell detection system. The cell detection method may include the following S11:

[0094] S11 . When a first bridge circuit of an acquisition loop is in an open state and a second bridge circuit is in a closed state, if an acquisition loop is in an abnormal state, control the second bridge circuit to be in an open state.

[0095] Among them, the first bridge circuit is any one of the main bridge circuit and the auxiliary bridge circuit; the second bridge circuit is different from the main bridge circuit; the acquisition loop is in an abnormal state, which indicates that an abnormal acquisition circuit exists in the acquisition loop.

[0096] As a possible implementation manner, the controller may control the second bridge circuit to be in an on state by adding the transmit SPI and receive SPI of the second bridge circuit to the CS signal.

[0097] It should be noted that when the acquisition circuit is in an abnormal state, the acquisition circuit cannot transmit cell data (including sending the cell data collected by itself and forwarding the cell data of the lower-level acquisition circuit).

[0098] It should be noted that the specific content of this step can be referred to the description of S2 above and will not be repeated here.

[0099] In a possible embodiment, the cell data also includes identifiers of multiple acquisition circuits (such as Figure 2 AFE1-AFE16 in Figure 3 As shown, the battery cell detection method provided in this application also includes the following S21-S23.

[0100] S21. Send control instructions to the two ports of the acquisition loop through the main bridge circuit and the auxiliary bridge circuit respectively.

[0101] The specific process of this step can be referred to the description of S2 above and will not be repeated here.

[0102] S22. Receive cell data from two ports of the acquisition loop.

[0103] As a possible implementation manner, the controller may receive the first battery cell data through a first port of the first acquisition board, and receive the second battery cell data through a second port of the second acquisition board.

[0104] The first cell data is the cell data between the abnormal acquisition circuit and the first port of the first acquisition board, and the second cell data is the cell data between the abnormal acquisition circuit and the second port of the second acquisition board.

[0105] For example, combined with Figure 2 In the case where the abnormal acquisition circuit is AFE4, the first cell data may include the cell data of AFE1, AFE2, and AFE3, and the second cell data may include the cell data of AFE5, AFE6, AFE7, and AFE8.

[0106] For example, combining Figure 2 In the case where the abnormal acquisition circuit is AFE3, the first cell data may include the cell data of AFE1 and AFE2, and the second cell data may include the cell data of AFE4, AFE5, AFE6, AFE7, and AFE8.

[0107] S23. Determine an abnormal acquisition circuit from multiple acquisition circuits in the acquisition loop according to the cell data.

[0108] Among them, the identifier of the abnormal collection circuit is not in the battery cell data.

[0109] As a possible implementation method, the controller can extract multiple acquisition circuit identifiers from each group of battery cell data obtained, and compare them with pre-stored acquisition circuit identifiers. If no battery cell data reported by a certain acquisition circuit identifier is received, it is determined that the acquisition circuit is an abnormal acquisition circuit.

[0110] As a possible implementation manner, the controller may mark the first target acquisition circuit in the first battery cell data and the second target acquisition circuit in the second battery cell data, and determine the abnormal acquisition circuit based on the first target acquisition circuit and the second target acquisition circuit.

[0111] The first target acquisition circuit is an acquisition circuit for which no lower-level acquisition circuit exists in the first cell data, and the second target acquisition circuit is an acquisition circuit for which no lower-level acquisition circuit exists in the second cell data.

[0112] In one example, the controller may mark the first target acquisition circuit as 1 and the second target acquisition circuit as 2. The controller determines which acquisition circuit has the abnormality by analyzing data 1 and data 2.

[0113] The various solutions in the above embodiments of the present application can be combined under the premise that there is no contradiction.

[0114] In the embodiment of the present application, the controller can be divided into component modules or component units according to the above method example. For example, each component module or component unit can be divided corresponding to each component, or two or more components can be integrated into one processing module. The above-mentioned integrated module can be implemented in the form of hardware or in the form of software component modules or component units. Among them, the division of modules or units in the embodiment of the present application is schematic and is only a logical component division. In actual implementation, there may be other division methods.

[0115] In addition, the actions and terms involved in the various embodiments of this application can refer to each other without limitation. The message names or parameter names in the messages exchanged between the various devices in the embodiments of this application are only examples, and other names can also be used in specific implementations without limitation.

[0116] It should be noted that the terms "first" and "second" in the specification, claims, and drawings of this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products, or devices.

[0117] It should be understood that in the present application, "at least one (item)" refers to one or more, "more than one" refers to two or more, "at least two (items)" refers to two or three and more than three, and "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0118] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned component modules is used as an example. In actual applications, the above-mentioned components can be assigned to different component modules as needed, that is, the internal structure of the device can be divided into different component modules to complete all or part of the components described above.

[0119] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of modules or units is only a logical component division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0120] Units described as separate components may or may not be physically separate, and components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0121] In addition, the various component units in the various embodiments of the present application may be integrated into a processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software component units.

[0122] If the integrated unit is implemented in the form of a software component unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a device (which can be a single-chip microcomputer, chip, etc.) or a processor to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

[0123] The above are only specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A battery cell detection system, characterized in that: The battery cell detection system includes: a controller, multiple acquisition loops, battery components and input and output IO expansion circuits; Each of the multiple acquisition loops includes a first acquisition board and a second acquisition board; the controller is connected to the first port of the first acquisition board through the IO expansion circuit, and the second port of the first acquisition board is connected to the first port of the second acquisition board; The first acquisition board and the second acquisition board are used to collect cell data of different cells in the battery assembly; and the IO expansion circuit is used to expand the number of IO ports of the controller.

2. The battery cell detection system according to claim 1, characterized in that: The second acquisition board is further provided with a second port, and the controller is connected to the second port of the second acquisition board through the IO expansion circuit.

3. The battery cell detection system according to claim 1, characterized in that: The battery cell detection system also includes a bridge circuit arranged between the controller and the acquisition loop; the bridge circuit is used to convert the first communication protocol into a second communication protocol, or to convert the second communication protocol into the first communication protocol; the first communication protocol is the protocol configured by the acquisition loop, and the second communication protocol is the protocol configured by the controller.

4. The battery cell detection system according to claim 3, characterized in that: The bridge circuit is configured with a sending serial peripheral interface SPI and a receiving SPI; The sending SPI is used to send the control instructions from the controller to the acquisition loop; the receiving SPI is used to send the cell data collected by the acquisition loop to the controller; The control instruction is used to instruct the acquisition loop to acquire the battery cell data.

5. The battery cell detection system according to claim 3, characterized in that: The bridge circuit includes a main bridge circuit and an auxiliary bridge circuit; the main bridge circuit is arranged between the first acquisition board and the controller; the auxiliary bridge circuit is arranged between the second acquisition board and the controller.

6. The battery cell detection system according to claim 1, characterized in that: For any acquisition board in the acquisition loop, a plurality of acquisition circuits are provided on the acquisition board, and different acquisition circuits are used to acquire cell data of different cells in the battery assembly.

7. The battery cell detection system according to claim 6, characterized in that: The multiple acquisition circuits in the acquisition loop are connected end to end in sequence through a daisy chain.

8. The battery cell detection system according to any one of claims 1 to 7, characterized in that: The cell data includes at least one of the following: temperature and voltage.

9. A battery cell detection method, characterized in that: A controller used in a battery cell detection system according to any one of claims 1 to 8; the method comprising: When the first bridge circuit of an acquisition loop is in an on state and the second bridge circuit is in a off state, if there is an abnormal acquisition circuit in the acquisition loop, the second bridge circuit is controlled to be in an on state; the first bridge circuit is any one of a main bridge circuit and an auxiliary bridge circuit; the second bridge circuit is different from the first bridge circuit.

10. The battery cell detection method according to claim 9, characterized in that: The cell data further includes identifiers of multiple acquisition circuits, and the method further includes: Sending the control instruction to the two ports of the acquisition loop respectively through the main bridge circuit and the auxiliary bridge circuit; Receive the cell data from two ports of the acquisition loop; An abnormal acquisition circuit is determined from multiple acquisition circuits in the acquisition loop according to the battery cell data; an identifier of the abnormal acquisition circuit is not in the battery cell data.

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