Battery management system, battery pack and aircraft

Abstract

The invention relates to a battery management system, a battery pack and an aircraft. The battery management system comprises a control board and a plurality of battery pack sampling boards, wherein each battery pack sampling board comprises a plurality of sampling wire harness connecting modules, each sampling wire harness connecting module comprises a first group of bonding pads and a second group of bonding pads, the first group of bonding pads are used for welding a connector, and the second group of bonding pads are used for welding a flexible circuit board; each battery pack sampling board is used for collecting battery cell state parameters of a plurality of battery cells in the battery pack through the corresponding connector or the corresponding flexible circuit board, and uploading the battery cell state parameters to the control board; and the control board is used for testing whether the function of each battery pack sampling board is abnormal or not or monitoring whether the state of the battery pack is abnormal or not based on the battery cell state parameters. According to the scheme provided by the invention, the adaptability of the battery pack sampling plate can be improved, and the high integration of the battery pack sampling plate is realized.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery management system, a battery pack and an aircraft. Background Art

[0002] BMS (Battery Management System) is a core component of modern battery technology, responsible for monitoring battery status, managing the charging and discharging process, protecting the battery from damage, etc. In BMS, the role of the wiring harness is crucial. It not only undertakes the task of power transmission, but also is responsible for signal collection and transmission, and is the basis for realizing various functions of BMS.

[0003] In the related technologies, most of the processes from development to mass production use a single sampling harness connection solution, such as only a connector solution or only a C2P solution (battery cells, FPC (Flexible Printed Circuit), and sampling boards are directly integrated together by welding). However, a single sampling harness connection solution has low adaptability and it is difficult to achieve high integration of the sampling board. Summary of the invention

[0004] In order to solve or partially solve the problems existing in the related art, the present application provides a battery management system, a battery pack and an aircraft, which can improve the adaptability of the battery pack sampling plate and realize the high integration of the battery pack sampling plate.

[0005] In a first aspect, the present application provides a battery management system, including a control board and a plurality of battery pack sampling boards; wherein each of the battery pack sampling boards includes a plurality of sampling harness connection modules, each of the sampling harness connection modules includes a first group of pads and a second group of pads, the first group of pads is used for welding a connector, and the second group of pads is used for welding a flexible circuit board; Each of the battery pack sampling boards is used to collect cell state parameters of multiple cells in the battery pack through the corresponding connector or the corresponding flexible circuit board, and upload the cell state parameters to the control board; The control board is used to test whether the functions of each of the battery pack sampling boards are abnormal or monitor whether the state of the battery pack is abnormal based on the battery cell state parameters.

[0006] In one embodiment, the control board is used to switch the connection mode of each of the battery pack sampling boards to the first setting mode during the development stage; Each of the battery pack sampling boards is used to connect the cell sampling harnesses through the corresponding plurality of connectors in the first setting mode to collect cell state parameters of the plurality of cells in the battery pack, and upload the cell state parameters to the control board; The control board is also used to test whether the functions of each battery pack sampling board are abnormal based on the battery cell status parameters during the development stage; if a target battery pack sampling board with abnormal function is tested, the multiple battery cell sampling harnesses connected to the target battery pack sampling board are disconnected to remove the target battery pack sampling board from the battery management system.

[0007] In one embodiment, the control board is used to switch the connection mode of each of the battery pack sampling boards to the first setting mode or the second setting mode in the application stage; Each of the battery pack sampling boards is used to, when switched to the first setting mode, connect the cell sampling harness through the corresponding plurality of connectors to collect the cell state parameters of the plurality of cells in the battery pack, and upload the cell state parameters to the control board; or, when switched to the second setting mode, collect the cell state parameters of the plurality of cells in the battery pack through the corresponding at least one flexible circuit board, and upload the cell state parameters to the control board; The control board is further used to monitor whether the state of the battery pack is abnormal based on the battery cell state parameters during the application stage; if the state of the battery pack is abnormal, an alarm signal is issued.

[0008] In one embodiment, each of the sampling harness connection modules further includes a fixing hole, and the connector and the flexible circuit board share the fixing hole; The fixing hole is used to locate the welding position of the connector and the flexible circuit board.

[0009] In one embodiment, each of the sampling harness connection modules further includes a test point, and the connector and the flexible circuit board share the test point; The control board is used to switch the connection mode of each of the battery pack sampling boards to a second setting mode during the mass production stage; Each of the battery pack sampling plates is used to test the welding process of the flexible circuit board through the test point in the second setting mode.

[0010] In one embodiment, the first group of welding pads and the second group of welding pads are located on the same plane of the battery pack sampling plate, wherein the first group of welding pads includes a plurality of first welding pad units, the second group of welding pads includes a plurality of second welding pad units, a plurality of the first welding pad units are arranged side by side, and a plurality of the second welding pad units are arranged in a staggered manner.

[0011] In one embodiment, each of the sampling harness connection modules further includes a differential sampling circuit; The differential sampling circuit is used to calculate and convert the cell state parameters and then upload them to the control board.

[0012] In one embodiment, the first group of pads and the second group of pads have corresponding net names.

[0013] A second aspect of the present application provides a battery pack, comprising a battery cell, a connector, a flexible circuit board and the battery management system as described above; wherein the battery management system is connected to the battery cell via the connector or the flexible circuit board.

[0014] A third aspect of the present application provides an aircraft, comprising the battery pack as described above.

[0015] The technical solution provided by this application may have the following beneficial effects: The battery management system provided in the present application includes a control board and multiple battery pack sampling boards; wherein each battery pack sampling board includes multiple sampling harness connection modules, each sampling harness connection module includes a first group of pads and a second group of pads, the first group of pads is used for welding connectors, and the second group of pads is used for welding flexible circuit boards; each battery pack sampling board is used to collect the cell status parameters of multiple cells in the battery pack through the corresponding connector or the corresponding flexible circuit board, and upload the cell status parameters to the control board; the control board is used to test whether the functions of each battery pack sampling board are abnormal or monitor whether the status of the battery pack is abnormal based on the cell status parameters. The present application integrates the connector and the flexible circuit board on the battery pack sampling board through a modular approach, so it can be compatible with the connector solution and the C2P solution, thereby improving the adaptability of the battery pack sampling board, and at the same time can ensure that the compatible solution occupies the smallest space, thereby achieving a high degree of integration of the battery pack sampling board.

[0016] 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

[0017] The above and other objects, features and advantages of the present application will become more apparent by describing in more detail the exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0018] Figure 1 is a schematic diagram of the structure of a battery management system shown in an embodiment of the present application; Figure 2 is a schematic diagram of the structure of a battery pack sampling plate shown in an embodiment of the present application; Figure 3 is a schematic diagram of the structure of a battery pack shown in an embodiment of the present application; Figure 4 It is a schematic diagram of the structure of an aircraft shown in an embodiment of the present application. DETAILED DESCRIPTION

[0019] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0020] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0021] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0022] In the related technologies, most of the processes from development to mass production use a single sampling harness connection solution, such as only a connector solution or only a C2P solution (the battery cell, FPC, and sampling board are directly integrated together by welding). However, the adaptability of a single sampling harness connection solution is low, and it is difficult to achieve a high degree of integration of the sampling board.

[0023] In response to the above problems, an embodiment of the present application provides a battery management system, which integrates the connector and the flexible circuit board on the battery pack sampling board through a modular approach. Therefore, it can be compatible with the connector solution and the C2P solution, thereby improving the adaptability of the battery pack sampling board. At the same time, it can ensure that the compatible solution occupies the smallest space, thereby achieving high integration of the battery pack sampling board.

[0024] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0025] Figure 1It is a structural schematic diagram of a battery management system shown in an embodiment of the present application. The battery management system includes a control board and multiple battery pack sampling boards; wherein each battery pack sampling board includes multiple sampling harness connection modules, each sampling harness connection module includes a first group of pads and a second group of pads, the first group of pads is used for welding connectors, and the second group of pads is used for welding flexible circuit boards; each battery pack sampling board is used to collect the cell state parameters of multiple cells in the battery pack through the corresponding connector or the corresponding flexible circuit board, and upload the cell state parameters to the control board; the control board is used to test whether the function of each battery pack sampling board is abnormal or monitor whether the state of the battery pack is abnormal based on the cell state parameters.

[0026] like Figure 1 As shown, the battery management system may include a control board and battery pack sampling boards 1~m, where m is an integer greater than 1. Among them, each battery pack sampling board belongs to a slave board, which is mainly used for sampling and sending the cell status parameters of multiple cells in the battery pack. The control board belongs to the main board, which is responsible for collecting sampling information from each slave board, verifying the functional stability of each slave board in various working condition tests based on the sampling information, or monitoring the various states of the battery pack to ensure the safe use of the battery pack during the charging and discharging process. Among them, each slave board can be connected to the main board through CAN (Controller Area Network) communication or daisy chain communication.

[0027] exist Figure 1 In the embodiment, each battery pack sampling board may include n sampling harness connection modules, where n is an integer greater than 1. Figure 2 Each battery pack sampling board may include 5 sampling harness connection modules, and each sampling harness connection module may include two groups of pads, namely C2P solution pads and connector pads, wherein the connector pads may be used as the first group of pads, and the first group of pads may be used for welding the connector, and the C2P solution pads may be used as the second group of pads, and the second group of pads may be used for welding the flexible printed circuit board (FPC), wherein the flexible printed circuit board is also called gold finger.

[0028] It should be noted that the number n of sampling harness connection modules included in the battery pack sampling plate may not be limited to 5. For example, the number n of sampling harness connection modules may be set according to the space size of the battery pack sampling plate. The embodiment of the present application does not limit this.

[0029] Since each battery pack sampling board can integrate the connector and the flexible circuit board at the same time through the sampling harness connection module, each battery pack sampling board can use the connector solution to collect the cell state parameters of multiple cells in the battery pack, and can also use the C2P solution to collect the cell state parameters of multiple cells in the battery pack. For example, Figure 2As shown, each battery pack sampling board is provided with sampling harness connection modules 1 to 5, and each battery pack sampling board can integrate 5 connectors and 5 flexible circuit boards at the same time through the sampling harness connection modules 1 to 5. Figure 1 In the embodiment, each cell group may include 5 cells. When the user wants to adopt the connector solution, the control board may send a first connection control instruction to the battery pack sampling boards 1-m, so that the battery pack sampling board 1 may respectively collect the cell state parameters of the cells A1-A5 in the cell group 1 through the corresponding connectors 1-5, the battery pack sampling board 2 may respectively collect the cell state parameters of the cells B1-B5 in the cell group 2 through the corresponding connectors 1-5, ..., the battery pack sampling board m may collect the cell state parameters of the cells M1-M5 in the cell group m through the corresponding connectors 1-5. Cell status parameters; or, when the user wants to adopt the C2P solution, the control board can send a second connection control instruction to the battery pack sampling boards 1~m, so that the battery pack sampling board 1 can collect the cell status parameters of the cells A1~A5 in the cell group 1 through the corresponding flexible circuit boards 1~5, and the battery pack sampling board 2 can collect the cell status parameters of the cells B1~B5 in the cell group 2 through the corresponding flexible circuit boards 1~5, ..., the battery pack sampling board m can collect the cell status parameters of the cells M1~M5 in the cell group m through the corresponding flexible circuit boards 1~5.

[0030] The battery pack sampling boards 1~m can upload the cell status parameters collected by themselves to the control board, where the cell status parameters can be used to test whether the function of the battery pack sampling board is abnormal, and can also be used to monitor whether the status of the battery pack is abnormal. Specifically, each battery pack sampling board needs to pass functional tests under various extreme conditions during the development stage. Only battery pack sampling boards that pass the functional tests can be successfully put online, so that in the application stage, the control board can use each battery pack sampling board to monitor the various states of the battery pack in real time to ensure the safe use of the battery pack during the charging and discharging process. Therefore, the cell status parameters uploaded in the development stage can be used to test whether the function of the battery pack sampling board is abnormal, and the cell status parameters uploaded in the application stage can be used to monitor whether the status of the battery pack is abnormal.

[0031] It can be seen that compared with the related technology that only uses the connector solution, it is not only unable to adapt to the C2P solution requirements in the mass production stage, resulting in low adaptability of the sampling board, but also difficult to achieve high integration of the sampling board and maximize the battery pack area efficiency. In this regard, the embodiment of the present application integrates the connector and the flexible circuit board on the battery pack sampling board through a modular approach. For example, the embodiment of the present application sets 5 sampling harness connection modules on each battery pack sampling board, and each sampling harness connection module is provided with a connector pad and a C2P solution pad. In this way, each sampling harness connection module can simultaneously integrate the connector and the flexible circuit board through two sets of pads, so that each sampling harness connection module can be compatible with the connector solution and the C2P solution. Therefore, the embodiment of the present application is suitable for both the connector solution requirements in the development stage and the C2P solution requirements in the mass production stage, thereby improving the adaptability of the battery pack sampling board. At the same time, the embodiment of the present application can ensure that the compatible solution occupies the smallest space, thereby realizing the high integration of the battery pack sampling board, and the C2P solution is that the battery cell, the flexible circuit board, and the battery pack sampling board are directly integrated together by welding, so the battery pack volume efficiency can be maximized.

[0032] It can be seen that compared with the related art that only adopts the C2P solution, it is not only unable to adapt to the connector solution requirements in the development stage, resulting in low adaptability of the sampling board, but also difficult to achieve high integration of the sampling board. In this regard, the embodiment of the present application integrates the connector and the flexible circuit board on the battery pack sampling board through a modular approach. For example, the embodiment of the present application is provided with 5 sampling harness connection modules on each battery pack sampling board, and each sampling harness connection module is provided with a connector pad and a C2P solution pad. In this way, each sampling harness connection module can simultaneously integrate the connector and the flexible circuit board through two sets of pads, so that each sampling harness connection module can be compatible with the connector solution and the C2P solution. Therefore, the embodiment of the present application is adapted to both the connector solution requirements in the development stage and the C2P solution requirements in the mass production stage, thereby improving the adaptability of the battery pack sampling board. At the same time, the embodiment of the present application can ensure that the compatible solution occupies the smallest space, thereby achieving high integration of the battery pack sampling board.

[0033] In one embodiment, a control board is used to switch the connection mode of each battery pack sampling board to a first setting mode during a development stage; each battery pack sampling board is used to connect to a cell sampling harness through a corresponding plurality of connectors in the first setting mode to collect cell status parameters of a plurality of cells in the battery pack, and upload the cell status parameters to the control board; the control board is also used to test whether the function of each battery pack sampling board is abnormal based on the cell status parameters during the development stage; if a target battery pack sampling board with an abnormal function is detected, the plurality of cell sampling harnesses connected to the target battery pack sampling board are disconnected to remove the target battery pack sampling board from the battery management system.

[0034] Since the C2P solution directly integrates the battery cell, flexible circuit board, and battery pack sampling board together by welding, if only the C2P solution is used in the related technology, it is difficult to avoid the entire battery pack being scrapped due to software, hardware, or functional abnormalities during the testing process in the development stage, thereby increasing the testing cost. In this regard, the embodiment of the present application can implement functional testing of the battery pack sampling board based on the connector solution during the development stage. When the function of any battery pack sampling board is tested to be abnormal, the battery pack sampling board with abnormal function can be directly disassembled through the connector solution, thereby avoiding the entire battery pack being scrapped due to the use of the C2P solution during the testing process in the development stage. Therefore, the embodiment of the present application can effectively reduce the testing cost.

[0035] In a specific implementation, the control board sends a first connection control instruction to each battery pack sampling board during the development stage. The first connection control instruction is used to instruct each battery pack sampling board to switch its connection mode to the first setting mode, wherein the first setting mode may refer to a connection mode based on a connector solution, so each battery pack sampling board can connect to a cell sampling harness through corresponding multiple connectors in the first setting mode, wherein each connector can connect to a cell sampling harness, and each cell sampling harness can connect to a cell, so each battery pack sampling board can collect cell state parameters of multiple cells in the battery pack through corresponding multiple connectors and multiple cell sampling harnesses correspondingly connected to the multiple connectors, and then upload the collected cell state parameters to the control board, which tests whether the function of each battery pack sampling board is abnormal based on the cell state parameters during the development stage. The cell state parameters may include at least one of cell voltage parameters and NTC (Negative Temperature Coefficient) temperature parameters.

[0036] As an example, during the development stage, the embodiment of the present application can configure various extreme working conditions for the test environment of each battery pack sampling board. Under various extreme working conditions, assuming that the connector 1 of the battery pack sampling board 1 is damaged, it may cause the connector 1 to be unable to collect the cell status parameters of the battery cell A1, and thus the controller cannot receive the cell status parameters of the battery cell A1. In this case, the controller can test that the battery pack sampling board 1 is functionally abnormal.

[0037] As another example, during the development stage, an embodiment of the present application can configure various extreme working conditions for the test environment of each battery pack sampling board. Under various extreme working conditions, assuming that connector 1 of the battery pack sampling board 1 is damaged, it may cause a large difference between the cell status parameters of battery cell A1 collected by connector 1 and the cell status parameters of other battery cells collected by other connectors. For example, the control board can determine whether the difference between the cell status parameters of battery cell A1 and the cell status parameters of battery cell A2 is greater than a preset threshold. If the difference is greater than the preset threshold, the controller can test that the battery pack sampling board 1 is functionally abnormal.

[0038] Since the multiple connectors integrated in the battery pack sampling board communicate in series, as long as one connector is damaged, the entire battery pack sampling board will be unable to communicate, so the entire battery pack sampling board can be scrapped. Specifically, if the function of a battery pack sampling board is tested to be abnormal, the control board can determine the battery pack sampling board as the target battery pack sampling board, and then disconnect the multiple battery cell sampling harnesses connected to the target battery pack sampling board, thereby removing the target battery pack sampling board from the battery management system. Exemplarily, assuming that connector 1 of battery pack sampling board 1 is damaged, the controller can test that the function of battery pack sampling board 1 is abnormal, so battery pack sampling board 1 can be determined as the target battery pack sampling board, and then the target battery pack sampling board (i.e., battery pack sampling board 1) can be removed from the battery management system by disconnecting the battery cell sampling harnesses 1~5 corresponding to connectors 1~5 in the target battery pack sampling board (i.e., battery pack sampling board 1).

[0039] In one embodiment, each sampling harness connection module further includes a fixing hole, and the connector and the flexible circuit board share the fixing hole; the fixing hole is used to locate the welding position of the connector and the flexible circuit board.

[0040] like Figure 2 As shown, each sampling harness connection module may include not only connector pads (i.e., the first group of pads) and C2P solution pads (i.e., the second group of pads), but also fixing holes. The connector and the flexible circuit board may share the fixing holes, thereby maximizing the space utilization of the battery pack sampling board.

[0041] When welding a connector, a reference object needs to be aligned to ensure that the connector is accurately welded to the first set of pads. Similarly, when welding a flexible circuit board, a reference object needs to be aligned to ensure that the flexible circuit board is accurately welded to the second set of pads. In this regard, the embodiment of the present application sets a fixing hole on each sampling harness connection module so that the welding position of the connector and the flexible circuit board can be accurately located through the fixing hole.

[0042] In addition, the fixing holes can also improve the reliability of the first group of pads and the second group of pads. Taking the connector solution as an example, since a board-end connector will be welded on the first group of pads, after the board-end connector is subsequently connected to the battery sampling harness at the line end, the line end may vibrate or be subjected to force, and these forces transmitted from the line end to the board end will directly pull the first group of pads, thereby reducing the reliability of the first group of pads. In this regard, the embodiments of the present application provide fixing holes on each sampling harness connection module so that these forces transmitted from the line end to the board end can be absorbed by the fixing holes, thereby avoiding the first group of pads from being directly subjected to force, thereby improving the reliability of the first group of pads. Similarly, the fixing holes can also avoid the second group of pads from being directly subjected to force, thereby improving the reliability of the second group of pads.

[0043] In one embodiment, each sampling harness connection module also includes a test point, which is shared by the connector and the flexible circuit board; a control board is used to switch the connection mode of each battery pack sampling board to a second setting mode during the mass production stage; and each battery pack sampling board is used to test the welding process of the flexible circuit board through the test point in the second setting mode.

[0044] In addition, the related art also adopts a design scheme of switching sampling connections at a certain stage, but this scheme requires a forced switching scheme. For example, the related art sets the connector pads and the C2P scheme pads on different battery pack sampling boards, or the related art only sets the connector pads on the battery pack sampling board. Therefore, the connector scheme can only be used to complete the relevant test items first, and then the battery pack sampling board needs to be modified. That is, the related art needs to replace the connector pads on the battery pack sampling board with C2P scheme pads, so as to forcibly switch the connector scheme to the C2P scheme, and then use the C2P scheme to complete the relevant test items. It can be seen that this scheme has problems such as large changes in production processes and production lines, high switching costs, and the need to retest relevant test items, thereby causing waste of resources.

[0045] In this regard, the embodiment of the present application simultaneously sets the connector pad and the C2P solution pad on the same battery pack sampling board, so that the same battery pack sampling board can be compatible with the connector solution and the C2P solution at the same time. Therefore, the same battery pack sampling board can realize arbitrary switching between the connector solution and the C2P solution without changing the board, thereby avoiding the waste of resources caused by large changes in production processes and production lines, high switching costs, and the need to retest related test items.

[0046] like Figure 2As shown, each sampling harness connection module may include not only connector pads (i.e., the first group of pads), C2P solution pads (i.e., the second group of pads) and fixing holes, but also test points. The connector and the flexible circuit board may share the test points. The test points can support ICT (In Circuit Tester), FCT (Functional Circuit Test) and other functional tests.

[0047] Since the functional test of the battery pack sampling board under various extreme working conditions has been tested based on the connector solution during the development stage, when the battery pack sampling board passes the functional test, the battery pack sampling board can enter the mass production stage. Therefore, the embodiment of the present application only needs to test the welding process of the flexible circuit board in the battery pack sampling board during the mass production stage, thereby reducing the test items caused by the scheme switching.

[0048] In a specific implementation, the control board sends a second connection control instruction to each battery pack sampling board during the mass production stage, and the second connection control instruction is used to instruct the connection mode of each battery pack sampling board to switch to the second setting mode, wherein the second setting mode may refer to a connection mode based on the C2P scheme. Therefore, each battery pack sampling board can perform a continuity test on the flexible circuit board based on the test point in the second setting mode. For example, a multimeter or other professional electrical testing equipment can be used to collect voltage data from the test point, and the conductivity of the flexible circuit board and whether there is a short circuit or open circuit can be checked based on the voltage data, so as to test the quality of the welding process of the flexible circuit board.

[0049] It should be noted that since the test environment in the development stage has been configured with various extreme working conditions, when the battery pack sampling board passes the functional test under various extreme working conditions, the test environment in the mass production stage can be configured with simpler working conditions, that is, testing the welding process of the flexible circuit board in the battery pack sampling board under non-extreme conditions, thereby avoiding scrapping the entire battery pack.

[0050] It should be noted that the embodiments of the present application can also complete the test items of the welding process of the flexible circuit board in the DV (Design Verification) stage or the PV (Production Validation) stage, and the embodiments of the present application are not limited to this.

[0051] In one embodiment, the first group of welding pads and the second group of welding pads are located on the same plane of the battery pack sampling plate, wherein the first group of welding pads includes a plurality of first welding pad units, the second group of welding pads includes a plurality of second welding pad units, the plurality of first welding pad units are arranged side by side, and the plurality of second welding pad units are arranged in a staggered manner.

[0052] If the first group of pads is set on the front side of the battery pack sampling plate and the second group of pads is set on the back side of the battery pack sampling plate, it is impossible to ensure that the compatible solution occupies the smallest space. For this reason, the embodiment of the present application can simultaneously set the first group of pads and the second group of pads in the same plane of the battery pack sampling plate, such as Figure 2 As shown, the sampling harness connection modules 1 to 5 are arranged on the front of the battery pack sampling board, so that the connector pads (i.e., the first group of pads) and the C2P solution pads (i.e., the second group of pads) can be located on the same plane of the battery pack sampling board, thereby ensuring that the compatible solution occupies the smallest space and realizing the high integration of the battery pack sampling board.

[0053] like Figure 2 As shown, the connector pad (i.e., the first group of pads) may include a plurality of first pad units a, and the C2P solution pad (i.e., the second group of pads) may include a plurality of second pad units b. Each connector pad (i.e., the first group of pads) corresponds to a connector to be welded, so a plurality of first pad units a may be arranged side by side. Each C2P solution pad (i.e., the second group of pads) corresponds to a flexible circuit board to be welded, or 5 C2P solution pads (i.e., the second group of pads) correspond to a flexible circuit board to be welded, so a plurality of second pad units b may be arranged in a staggered manner, thereby being able to improve the insulation withstand voltage of adjacent second pad units b, while reserving sufficient space and tin overflow margin for the welding of the flexible circuit board.

[0054] In one embodiment, the first group of pads and the second group of pads have corresponding net names.

[0055] The network names of the first group of pads can correspond one to one with the network names of the second group of pads, so that the same interface definition can be used. For example, when switching from a connector solution to a C2P solution, the interface definition does not need to be changed, thereby improving the flexibility of the system, promoting decoupling between modules, and improving development efficiency.

[0056] In one embodiment, a control board is used to switch the connection mode of each battery pack sampling board to a first setting mode or a second setting mode during an application stage; each battery pack sampling board is used to connect a cell sampling harness through a corresponding plurality of connectors to collect cell status parameters of a plurality of cells in the battery pack when switched to the first setting mode, and upload the cell status parameters to the control board; or, when switched to the second setting mode, collect cell status parameters of a plurality of cells in the battery pack through a corresponding at least one flexible circuit board, and upload the cell status parameters to the control board; the control board is also used to monitor whether the state of the battery pack is abnormal based on the cell status parameters during an application stage; if an abnormal state of the battery pack is detected, an alarm signal is issued.

[0057] The battery pack sampling board has undergone functional testing in the development stage and FPC welding process testing in the mass production stage, and can meet the online requirements, so that in the application stage the control board can use each battery pack sampling board to monitor the various states of the battery pack in real time to ensure the safe use of the battery pack during the charging and discharging process.

[0058] It should be noted that the test environment in the development stage is subject to various extreme working conditions, which can easily cause the functions of the battery pack sampling board to be unstable. In order to avoid the situation where the entire battery pack is scrapped due to the use of the C2P solution, only the connector solution can be used in the development stage. The test environment in the mass production stage is a simpler working condition, and only the FPC welding process has not been tested. Therefore, only the C2P solution needs to be used in the mass production stage, and the application stage belongs to the online stage. Therefore, both the connector solution and the C2P solution can be used in the application stage.

[0059] In one example, the control board sends a first connection control instruction to each battery pack sampling board during the application phase, and the first connection control instruction is used to instruct each battery pack sampling board to switch its connection mode to a first setting mode, wherein the first setting mode may refer to a connection mode based on a connector solution, so that each battery pack sampling board can be connected to a cell sampling harness through corresponding multiple connectors in the first setting mode, so that the cell status parameters of multiple cells in the battery pack can be collected through the corresponding multiple connectors and the multiple cell sampling harnesses corresponding to the multiple connectors, and then the collected cell status parameters can be uploaded to the control board.

[0060] In another example, the control board sends a second connection control instruction to each battery pack sampling board during the application phase, and the second connection control instruction is used to instruct each battery pack sampling board to switch the connection mode to the second setting mode, wherein the second setting mode may refer to a connection mode based on the C2P scheme, wherein if each second group of pads corresponds to a flexible circuit board welded thereto, each battery pack sampling board may correspond to an integrated plurality of flexible circuit boards; if multiple second groups of pads correspond to a flexible circuit board welded thereto, each battery pack sampling board may correspond to an integrated flexible circuit board, wherein the flexible circuit board is equivalent to a wiring harness, and therefore each battery pack sampling board may collect the cell status parameters of the plurality of battery cells in the battery pack through at least one corresponding flexible circuit board in the second setting mode, and then upload the collected cell status parameters to the control board.

[0061] Among them, the cell state parameter may include at least one of the cell voltage parameter and the NTC temperature parameter. The control board may monitor whether the voltage state of the battery pack is abnormal in real time based on the cell voltage parameter in the application stage, and / or monitor whether the temperature state of the battery pack is abnormal in real time based on the NTC temperature parameter. As an example, the control board may determine whether the cell voltage parameter is within the normal voltage range. If the cell voltage parameter is within the normal voltage range, the voltage state of the battery pack is normal; if the cell voltage parameter is not within the normal voltage range, the voltage state of the battery pack is abnormal, and an alarm signal may be issued at this time so that the battery management system can perform safety protection on the battery pack. As another example, the control board may determine whether the NTC temperature parameter is within the normal temperature range. If the NTC temperature parameter is within the normal temperature range, the temperature state of the battery pack is normal; if the NTC temperature parameter is not within the normal temperature range, the temperature state of the battery pack is abnormal, and an alarm signal may be issued at this time so that the battery management system can perform safety protection on the battery pack. For example, if the temperature of the battery pack is too high, the battery management system may start the cooling system, or reduce the charge and discharge speed of the battery pack to prevent thermal runaway.

[0062] It should be noted that the embodiments of the present application can be applicable to battery packs with different types of battery cells, for example, battery packs with cylindrical battery cells and battery packs with square shell battery cells.

[0063] In one embodiment, each sampling harness connection module further includes a differential sampling circuit; the differential sampling circuit is used to calculate and convert the battery cell state parameters and upload them to the control board.

[0064] In order to provide stable and accurate digital signal output, each sampling harness connection module may also include a differential sampling circuit. Whenever the connector or flexible circuit board collects the battery cell status parameters, the connector or flexible circuit board can transmit the battery cell status parameters to the differential sampling circuit in the battery pack sampling board where it is located, so that the battery cell status parameters can be calculated and converted by the differential sampling circuit and then uploaded to the control board, thereby effectively suppressing common mode noise, enhancing pit interference capability, and improving signal stability.

[0065] As can be seen from this example, the present application integrates the connector and flexible circuit board on the battery pack sampling board through a modular approach, so it can be compatible with the connector solution and the C2P solution, thereby improving the adaptability of the battery pack sampling board, while ensuring that the compatible solution occupies the smallest space, thereby achieving a high degree of integration of the battery pack sampling board.

[0066] Furthermore, during the development stage, the present application can implement functional testing of the battery pack sampling board based on the connector solution. When the function of any battery pack sampling board is tested to be abnormal, the battery pack sampling board with the abnormal function can be directly disassembled through the connector solution, thereby avoiding the scrapping of the entire battery pack due to the use of the C2P solution during the testing process in the development stage, thereby effectively reducing the testing cost.

[0067] Furthermore, since the functional test of the battery pack sampling board under various extreme working conditions has been tested based on the connector solution during the development stage, when the battery pack sampling board passes the functional test, the battery pack sampling board can enter the mass production stage. Therefore, the present application only needs to test the welding process of the flexible circuit board integrated in the battery pack sampling board during the mass production stage, thereby reducing the test items caused by the scheme switching.

[0068] Furthermore, since the test environment in the development stage has been configured with various extreme working conditions, when the battery pack sampling board passes the functional test under various extreme working conditions, the test environment in the mass production stage can be configured with simpler working conditions, that is, testing the welding process of the flexible circuit board in the battery pack sampling board under non-extreme conditions, thereby avoiding scrapping the entire battery pack.

[0069] Furthermore, the present application can accurately locate the welding position of the connector and the flexible circuit board through the fixing holes, and can also improve the reliability of the first group of welding pads and the second group of welding pads.

[0070] Furthermore, the present application can simultaneously set the first group of pads and the second group of pads in the same plane of the battery pack sampling plate, thereby ensuring that the compatible solution occupies the smallest space and realizing the high integration of the battery pack sampling plate.

[0071] Figure 3 : is a schematic diagram of the structure of a battery pack shown in an embodiment of the present application. The battery pack may include a battery cell, a connector, a flexible circuit board and a battery management system as described above; wherein the battery management system is connected to the battery cell via a connector or a flexible circuit board.

[0072] Figure 4 1 is a schematic diagram of the structure of an aircraft shown in an embodiment of the present application. The aircraft may be a flying car, which may have a battery pack as described above.

[0073] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A battery management system, characterized in that: It includes a control board and a plurality of battery pack sampling boards; wherein each of the battery pack sampling boards includes a plurality of sampling harness connection modules, each of the sampling harness connection modules includes a first group of pads and a second group of pads, the first group of pads is used for welding connectors, and the second group of pads is used for welding flexible circuit boards; Each of the battery pack sampling boards is used to collect cell state parameters of multiple cells in the battery pack through the corresponding connector or the corresponding flexible circuit board, and upload the cell state parameters to the control board; The control board is used to test whether the functions of each of the battery pack sampling boards are abnormal or monitor whether the state of the battery pack is abnormal based on the battery cell state parameters.

2. The system according to claim 1, characterized in that The control board is used to switch the connection mode of each of the battery pack sampling boards to a first setting mode during the development stage; Each of the battery pack sampling boards is used to connect the cell sampling harnesses through the corresponding plurality of connectors in the first setting mode to collect cell state parameters of the plurality of cells in the battery pack, and upload the cell state parameters to the control board; The control board is also used to test whether the functions of each battery pack sampling board are abnormal based on the battery cell status parameters during the development stage; if a target battery pack sampling board with abnormal function is tested, the multiple battery cell sampling harnesses connected to the target battery pack sampling board are disconnected to remove the target battery pack sampling board from the battery management system.

3. The system according to claim 1, characterized in that The control board is used to switch the connection mode of each of the battery pack sampling boards to the first setting mode or the second setting mode in the application stage; Each of the battery pack sampling boards is used to, when switched to the first setting mode, connect the cell sampling harness through the corresponding plurality of connectors to collect the cell state parameters of the plurality of cells in the battery pack, and upload the cell state parameters to the control board; or, when switched to the second setting mode, collect the cell state parameters of the plurality of cells in the battery pack through the corresponding at least one flexible circuit board, and upload the cell state parameters to the control board; The control board is further used to monitor whether the state of the battery pack is abnormal based on the battery cell state parameters during the application stage; if the state of the battery pack is abnormal, an alarm signal is issued.

4. The system according to claim 1, characterized in that Each of the sampling harness connection modules further comprises a fixing hole, and the connector and the flexible circuit board share the fixing hole; The fixing hole is used to locate the welding position of the connector and the flexible circuit board.

5. The system according to claim 1, characterized in that Each of the sampling harness connection modules further includes a test point, and the connector and the flexible circuit board share the test point; The control board is used to switch the connection mode of each of the battery pack sampling boards to a second setting mode during the mass production stage; Each of the battery pack sampling plates is used to test the welding process of the flexible circuit board through the test point in the second setting mode.

6. The system according to claim 1, characterized in that The first group of welding pads and the second group of welding pads are located on the same plane of the battery pack sampling plate, wherein the first group of welding pads includes a plurality of first welding pad units, the second group of welding pads includes a plurality of second welding pad units, a plurality of the first welding pad units are arranged side by side, and a plurality of the second welding pad units are arranged in a staggered manner.

7. The system according to claim 1, characterized in that Each of the sampling harness connection modules further includes a differential sampling circuit; The differential sampling circuit is used to calculate and convert the cell state parameters and then upload them to the control board.

8. The system according to claim 1, characterized in that The first group of pads and the second group of pads have corresponding network names.

9. A battery pack, characterized in that: The invention comprises a battery cell, a connector, a flexible circuit board and a battery management system according to any one of claims 1 to 8; wherein the battery management system is connected to the battery cell through the connector or the flexible circuit board.

10. An aircraft, characterized in that: A battery pack comprising the battery pack of claim 9.

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