Battery management device and battery pack

Abstract

The embodiment of the utility model provides a battery management device and a battery pack. The battery management device comprises a plurality of battery cell management units and a battery management unit, the plurality of battery cell management units are connected in series to form a battery cell data transmission link, and every two adjacent battery cell management units are in communication connection through a daisy chain; two ends of the cell data transmission link are respectively in communication connection with the battery management unit by adopting daisy chains; each battery cell management unit comprises a wired communication connection port, and the wired communication connection port is used for being in wired communication connection with a battery cell in a battery pack; the battery management unit comprises a wireless communication connection port, and the wireless communication connection port is used for being in wireless communication connection with an upper control system. The battery management system can solve the problems that wire harnesses in a battery pack of a pure wired communication battery management system are complex and the high-voltage safety coefficient is low, and meanwhile avoids the situation that the overall cost of the battery management system is increased due to pure wireless communication.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery management device and battery pack. Background Technology

[0002] With the booming development of the new energy industry, 400V and 800V high-voltage battery platforms are commonly seen. The battery packs of these high-voltage platforms are usually composed of multiple cells connected in series and parallel according to regulations. In order to ensure the safe and reliable operation of the battery pack, a battery management system is required to manage these cells that make up the battery pack and to monitor the voltage, temperature and circuit current of each cell in real time.

[0003] Currently, to facilitate better management of individual battery cells and circuit control in battery management systems, battery management systems can be divided into centralized battery management systems and distributed battery management systems, depending on their application. In traditional battery management systems, there are many cell sampling harnesses and control connection harnesses in the entire battery pack, with high-voltage and low-voltage harnesses mixed together, posing a serious challenge to electrical safety. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery management device and battery pack that can solve the problems of complex internal wiring harnesses and low high-voltage safety factor in pure wired communication battery management systems, while avoiding the overall cost increase of battery management systems caused by using pure wireless communication.

[0005] In a first aspect, embodiments of this application provide a battery management device, including a plurality of cell management units and a battery management unit;

[0006] Multiple battery cell management units are connected in series to form a battery cell data transmission link, and a daisy-chain communication connection is used between every two adjacent battery cell management units.

[0007] The two ends of the cell data transmission link are respectively connected to the battery management unit via a daisy chain.

[0008] Each of the cell management units includes a wired communication connection port for wired communication connection with the cells in the battery pack;

[0009] The battery management unit includes a wireless communication connection port, which is used to wirelessly communicate with a host control system that manages and controls the battery management device.

[0010] In conjunction with the first aspect, this application provides a first possible implementation of the first aspect, wherein the battery management unit includes a data acquisition chip and a communication chip;

[0011] The acquisition chip is communicatively connected to the communication chip.

[0012] The acquisition chip includes a wired communication connection port, which is used for wired communication connection with the data sampling sensor corresponding to the battery cell;

[0013] The communication chip includes a data communication port, which is used to connect to the adjacent cell management unit and / or to the battery management unit.

[0014] In conjunction with the first aspect, this application provides a second possible implementation of the first aspect, wherein the data acquisition chip and the data sampling sensor corresponding to the battery cell are connected by a communication harness, and the communication harness includes an FPC flexible connector or an FFC flexible connector.

[0015] In conjunction with the first aspect, this application provides a third possible implementation of the first aspect, wherein the cell management unit further includes a control chip;

[0016] The slave control chip is connected to the slave acquisition chip and the slave communication chip respectively.

[0017] In conjunction with the first aspect, this application provides a fourth possible implementation of the first aspect, wherein the battery management unit 12 includes a first main communication chip, a second main communication chip, and a main control chip;

[0018] The first main communication chip is a daisy-chain communication chip;

[0019] The second main communication chip is a wireless communication chip;

[0020] The main control chip is connected to the first main communication chip and the second main communication chip respectively.

[0021] In conjunction with the first aspect, this application provides a fifth possible implementation of the first aspect, wherein the battery management unit further includes a power conversion device;

[0022] The power conversion device is connected to the first main communication chip and the second main communication chip. The power conversion device includes a power supply port for connecting to the battery pack.

[0023] In conjunction with the first aspect, this application provides a sixth possible implementation of the first aspect, wherein the first main communication chip is daisy-chained with the battery management unit;

[0024] The second main communication chip is wirelessly connected to the upper control system.

[0025] In conjunction with the first aspect, this application provides a seventh possible implementation of the first aspect, wherein the communication chip is of model ADBMS1818 or MAX17841.

[0026] Secondly, embodiments of this application also provide a battery pack, including a battery driving device and a battery management device as described in the first aspect and any possible implementation thereof, wherein the battery management unit is integrated in the battery driving device.

[0027] This application provides a battery management device and battery pack, comprising: multiple cell management units and a battery management unit; the multiple cell management units are connected in series to form a cell data transmission link, and each two adjacent cell management units are connected by a daisy-chain communication connection; both ends of the cell data transmission link are respectively connected to the battery management unit by a daisy-chain communication connection; each cell management unit includes a wired communication connection port for wired communication with the cells in the battery pack; the battery management unit includes a wireless communication connection port for wireless communication with a host control system. This solution addresses the problems of complex internal wiring and low high-voltage safety in purely wired communication battery management systems, while avoiding the overall cost increase associated with purely wireless communication. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a battery management device provided in an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of the structure of a battery cell management unit provided in an embodiment of this utility model;

[0031] Figure 3 A schematic diagram of the structure of a battery management unit provided in an embodiment of this utility model;

[0032] Figure 4 This is a schematic diagram of another battery management unit provided in an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the structure of a battery pack provided in an embodiment of the present utility model.

[0034] Icons: 10-Daiwiring communication loop; 20-Wired communication link; 11-Cell management unit; 12-Battery management unit; 111-Slave acquisition chip; 112-Slave communication chip; 113-Slave control chip; 121-First main communication chip; 122-Second main communication chip; 123-Power conversion device; 124-Main control chip. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0040] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] Considering that traditional battery management systems typically use wired communication, the entire battery pack contains numerous cell sampling harnesses and control connection harnesses, with high-voltage and low-voltage harnesses mixed together, posing a serious challenge to electrical safety. Battery packs using wireless communication can meet the aforementioned advantages, but simply using wireless communication would significantly increase the cost of the battery management system.

[0042] This application provides a battery management device and battery pack, including: multiple cell management units 11 and a battery management unit 12; the multiple cell management units 11 are connected in series to form a cell data transmission link, and each two adjacent cell management units 11 are connected by a daisy-chain communication connection; both ends of the cell data transmission link are respectively connected to the battery management unit 12 by a daisy-chain communication connection; each cell management unit 11 includes a wired communication connection port, which is used for wired communication connection with the cells in the battery pack; the battery management unit 12 includes a wireless communication connection port, which is used for wireless communication connection with a host control system that manages and controls the battery management device. This solution can solve the problems of complex internal wiring and low high-voltage safety factor in purely wired communication battery management systems, while avoiding the overall cost increase of the battery management system caused by purely wireless communication.

[0043] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a battery management device provided in this embodiment.

[0044] like Figure 1 As shown in the figure, the battery management device provided in this embodiment includes: a daisy-chain communication loop 10 and a wired communication link 20.

[0045] Specifically, the daisy-chain communication loop 10 is equipped with multiple cell management units 11 and battery management units 12; each cell management unit 11 is wired to the cells in the battery pack to form a wired communication link 20.

[0046] Here, multiple cell management units 11 are connected in series, and a daisy-chain bidirectional communication connection is used between every two adjacent cell management units 11; the two ends of the cell data transmission link are respectively connected to the battery management unit 12 bidirectionally via a daisy chain.

[0047] In specific implementation, the cell management unit 11 is used to collect battery status information such as voltage / temperature of individual cells in the battery pack. Each cell management unit 11 manages each individual cell in the battery pack. After the cell management units 11 of each individual cell in the battery pack are arranged in a series communication connection, a cell data transmission link for bidirectional data interaction between adjacent cell management units 11 is formed. In the cell data transmission link, bidirectional data interaction communication can be realized between every two adjacent cell management units 11. At the same time, the battery management unit 12 is bidirectionally connected to the cell management units 11 at both ends of the cell data transmission link to form a daisy-chain communication loop.

[0048] Here, multiple cell management units 11 are pre-set with a preset communication direction according to their corresponding connection order. According to the preset communication direction, after the battery management unit 12 is powered on, the communication initialization connection is performed in the preset communication direction through daisy-chain communication.

[0049] Once the daisy-chain communication connection is established between adjacent cell management units 11, and between the battery management unit 12 and the cell management units 11 at both ends of the cell data transmission link, the data transmission and reception process of the entire daisy-chain communication loop 10 can be completed periodically.

[0050] It should be noted that the upper-level control system is the host computer or other system within the engineering system where the battery management device is located in actual applications. For example, when the battery management system is applied to new energy vehicles, the corresponding upper-level control system can be the vehicle controller.

[0051] Optionally, when the battery management device provided in this application embodiment is applied in the field of new energy vehicles, the battery management unit 12 can be integrated into the vehicle battery disconnect unit (BDU). The battery management unit 12 is connected to the sampling point corresponding to the electrical component integrated in the vehicle battery disconnect unit through a copper busbar, so as to realize the connection between the battery management unit 12 and the battery pack.

[0052] Furthermore, the cell management unit 11 is connected to the individual cells in the battery pack via a wired communication harness. The cell management unit 11 collects individual cell voltage or temperature information and battery status information such as the total voltage of the battery pack through this wire harness.

[0053] Optionally, the wired connection between the cell management unit 11 and the cell can be a flexible flat cable (FFC) or a flexible printed circuit (FPC). From the perspective of integration, FPC connection and FFC connection are more reliable and simpler, resulting in higher integration between the cell management unit 11 and the battery pack, and higher utilization rate of the battery pack in the later stage.

[0054] This application provides a battery management device, including a daisy-chain communication loop 10 and a wired communication link 20. The daisy-chain communication loop 10 includes a battery management unit 12 and multiple cell management units 11. The multiple cell management units 11 are connected in series to form a cell data transmission link, with a daisy-chain bidirectional communication connection between every two adjacent cell management units 11. Both ends of the cell data transmission link are respectively connected to the battery management unit 12 via a daisy-chain bidirectional communication connection. Each cell management unit 11 is wiredly connected to a cell in the battery pack, forming the wired communication link. This solution addresses the problems of complex internal wiring and low high-voltage safety in purely wired communication battery management systems, while avoiding the increased overall cost of the battery management system that would result from purely wireless communication.

[0055] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of a battery cell management unit 11 provided in this embodiment.

[0056] like Figure 2 As shown in the figure, the battery management unit 11 provided in this embodiment includes: a data acquisition chip 111, a communication chip 112, and a control chip 113.

[0057] Specifically, the data acquisition chip 111 is wired to the battery cell; for the battery management units 11 located at both ends of the battery cell data transmission link, the data communication ports of the communication chip 112 are respectively connected to the battery management unit 12 and the data communication ports of the communication chips 112 in the adjacent battery management unit 11; for the battery management units 11 other than those located at both ends of the battery cell data transmission link, the data communication ports of the communication chip 112 are respectively connected to the data communication ports of the communication chips 112 in the adjacent battery management unit 11. The control chip 113 is connected to the data acquisition chip 111 and the communication chip 112 respectively to trigger the data acquisition chip 111 and the communication chip 112 to implement the corresponding chip functions.

[0058] Here, the acquisition chip 111 is connected to the cell managed by the cell management unit 11 to collect voltage or temperature information of the cell connected to it and the total voltage of the battery pack. The communication chip 112 is used to complete communication between cell management units 11 and between cell management units 11 and battery management units 12 using daisy-chain loop communication.

[0059] The acquisition chip 111 and the battery cell are connected by a communication harness, or a flexible flat cable (FFC) or a flexible printed circuit (FPC) for wired communication.

[0060] Preferably, the communication chip 112 is of model ADBMS1818 or MAX17841.

[0061] It should be noted that the acquisition chip 111 only performs a simple data acquisition function, and existing conventional data acquisition chips can be used. Similarly, the control chip 113 is only used to trigger the acquisition chip 111 and the communication chip 112 to perform the corresponding chip functions, and existing conventional function triggering chips can be used.

[0062] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of a battery management unit 12 provided in this embodiment.

[0063] like Figure 3 As shown, the battery management unit 12 includes a first main communication chip 121, a second main communication chip 122, and a power conversion device 123.

[0064] Specifically, the first main communication chip 121 is a daisy-chain communication chip, which uses daisy-chain communication to connect to the battery cell management unit 11; the second main communication chip 122 is a wireless communication chip, which uses wireless communication to connect to the upper control system that manages and controls the battery management device. A power conversion device 123 is connected between the battery pack and the first main communication chip 121 and the second main communication chip 122 to step down the voltage of the battery pack and supply it to the first main communication chip 121 and the second main communication chip 122.

[0065] In specific implementation, the first main communication chip 121 is connected to the cell management unit 11 in a daisy-chain communication manner to realize the daisy-chain loop communication interaction between the battery management unit 12 and the cell management unit 11. The first main communication chip 121 can be a mature existing daisy-chain communication chip, such as the LTC6820 chip. The second main communication chip 122 can be a mature Bluetooth communication chip or a WIFI communication chip.

[0066] It should be noted that in the field of new energy vehicle technology, the traditional battery management system uses the vehicle's 12V lead-acid power supply to the battery management unit 12 via a connecting harness to power the module units included therein. However, in this embodiment, a high-voltage power supply is used, so the 12V power supply harness can be omitted.

[0067] Please see Figure 4 , Figure 4 This is a schematic diagram of another battery management unit 12 provided in this embodiment.

[0068] like Figure 4 As shown, the battery management unit 12 includes a first main communication chip 121, a second main communication chip 122, and a power conversion device 123, as well as a main control chip 124.

[0069] Specifically, the main control chip 124 is connected to the first main communication chip 121 and the second main communication chip 122 respectively, so as to trigger the first main communication chip 121 and the second main communication chip 122 to realize the corresponding chip functions.

[0070] It should be noted that the main control chip 124 is only used to trigger the first main communication chip 121 and the second main communication chip 122 to achieve the corresponding communication function. Existing conventional communication function triggering chips can be used.

[0071] Please see Figure 5 , Figure 5 This is a schematic diagram of a battery pack provided in this embodiment. Figure 5 As shown, the battery pack includes a battery drive unit and, as shown, ... Figure 1 The battery management device shown in the figure has a battery management unit 12 integrated into the battery drive device corresponding to the battery pack.

[0072] This application provides a battery management device, including a daisy-chain communication loop 10 and a wired communication link 20. The daisy-chain communication loop 10 includes a battery management unit 12 and multiple cell management units 11. The multiple cell management units 11 are connected in series to form a cell data transmission link, with a daisy-chain bidirectional communication connection between every two adjacent cell management units 11. Both ends of the cell data transmission link are respectively connected to the battery management unit 12 via a daisy-chain bidirectional communication connection. Each cell management unit 11 is wiredly connected to a cell in the battery pack, forming the wired communication link. This solution addresses the problems of complex internal wiring and low high-voltage safety in purely wired communication battery management systems, while avoiding the increased overall cost of the battery management system that would result from purely wireless communication.

[0073] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery management device for managing and controlling a battery pack, characterized in that, include: Multiple cell management units (11) and battery management unit (12); Multiple battery cell management units (11) are connected in series to form a battery cell data transmission link, and a daisy-chain communication connection is used between every two adjacent battery cell management units (11); The two ends of the cell data transmission link are respectively connected to the battery management unit (12) via a daisy chain; Each of the cell management units (11) includes a wired communication connection port for wired communication connection with the cells in the battery pack; The battery management unit (12) includes a wireless communication connection port, which is used to wirelessly communicate with the upper control system that manages and controls the battery management device.

2. The battery management device according to claim 1, characterized in that, The battery cell management unit (11) includes a data acquisition chip (111) and a communication chip (112); The acquisition chip (111) is communicatively connected to the communication chip (112); The acquisition chip (111) includes the wired communication connection port, which is used for wired communication connection with the data sampling sensor corresponding to the battery cell; The communication chip (112) includes a data communication port for connecting to the adjacent cell management unit (11) and / or to the battery management unit (12).

3. The battery management device according to claim 2, characterized in that: The data acquisition chip (111) and the data sampling sensor corresponding to the battery cell are connected via FPC or FFC communication.

4. The battery management device according to claim 2, characterized in that, The battery cell management unit (11) also includes a control chip (113); The slave control chip (113) is connected to the slave acquisition chip (111) and the slave communication chip (112) respectively.

5. The battery management device according to claim 2, characterized in that: The communication chip (112) is either ADBMS1818 or MAX17841.

6. The battery management device according to claim 1, characterized in that, The battery management unit (12) includes a first main communication chip (121), a second main communication chip (122), and a main control chip (124); The first main communication chip (121) is a daisy-chain communication chip; The second main communication chip (122) is a wireless communication chip; The main control chip (124) is connected to the first main communication chip (121) and the second main communication chip (122) respectively.

7. The battery management device according to claim 6, characterized in that, The battery management unit (12) also includes a power conversion device (123); The power conversion device (123) is connected to the first main communication chip (121) and the second main communication chip (122). The power conversion device (123) includes a power supply port for connecting to the battery pack.

8. The battery management device according to claim 6, characterized in that: The first main communication chip (121) is daisy-chained with the battery management unit (11); The second main communication chip (122) is wirelessly connected to the upper control system.

9. The battery management device according to claim 6, characterized in that: The first main communication chip (121) is model LTC6820.

10. A battery pack, characterized in that, It includes a battery drive device corresponding to a battery pack and a battery management device as described in any one of claims 1-9, wherein the battery management unit (12) is integrated in the battery drive device.

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