Highly integrated secondary battery management board and battery module

Abstract

The utility model provides a highly integrated secondary battery management board and a battery module, the management board comprises a battery connecting assembly CCS arranged in a battery box, the CCS comprises a supporting bottom plate, a plurality of contact electrodes and a circuit board, the contact electrodes and the circuit board are arranged on the supporting bottom plate, and the contact electrodes are electrically connected with the circuit board through connecting pieces; and an analog front-end circuit is also integrated on the circuit board, is in communication connection with a main control board located outside the CCS through a communication signal line, and is used for carrying out working parameter data acquisition and working state control on each single battery in the battery box. According to the secondary battery management board, the analog front-end circuit is integrated on the CCS, and an independent slave control unit (BCU) and an adapter wire harness for analog signal transmission are canceled, so that the cost of the battery management board is effectively reduced, and the reliability of the battery management board can be improved; besides, the management board adopting the structure can effectively shorten the supply chain and simplify the management of the supply chain for the producer.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery management technical field especially relates to a high integration formula secondary battery management board and battery module. BACKGROUND

[0002] With the rapid development of electric vehicle industry, power battery as one of the core components of electric vehicle, its safety, reliability and cost control put forward higher request. Battery management system (BMS) is the key to guarantee the safe and reliable operation of power battery, and its main function includes battery state monitoring, cell equalization, thermal management, fault diagnosis etc.

[0003] BMS architecture is usually composed of battery management unit (abbreviated as BMU, also called main control board), battery control unit (abbreviated as BCU, also called slave control board), battery connection component (CCS) etc. Among them, BCU is responsible for collecting the voltage, current and temperature information of the cell and transmitting the information to BMU, and BMU estimates the battery state according to the information collected by BCU, equalization control and thermal management etc. BCU is also responsible for interacting with high voltage devices (such as relay, fuse etc.), executing the control instructions of BMU, and CCS is responsible for connecting with single battery and communicating with vehicle network, realizing the collaborative work with other controllers.

[0004] However, for the current BMS architecture, CCS only has the function of analog signal connection, so each CCS needs to be connected with BCU through analog signal cable including multiple wire harnesses. For example, when a battery box has four battery packs, four analog signal cables need to be configured. This increases the complexity and cost of BMS system. In addition, since these analog signal cables need to be connected through connectors, it is difficult to realize automatic production, which limits the improvement of BMS system production efficiency. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of high integration formula secondary battery management board and battery module without analog signal adapter wire harness.

[0006] In order to realize the above-mentioned purpose, the utility model provides a kind of high integration formula secondary battery management board, which includes battery connection component CCS arranged in battery box, the CCS includes support base plate and the contact electrode and circuit board of being arranged on the support base plate, the contact electrode is electrically connected with the circuit board by connecting piece, and the contact electrode is used for abutting with the electrode on the single battery in the battery box;The analog front-end circuit is also integrated on the circuit board, and the analog front-end circuit is connected with the main control board located outside the CCS by communication signal line, and the analog front-end circuit is used for collecting working parameter data and working state control to each single battery in the battery box.

[0007] Preferably, the substrate of the circuit board is any of the following structures:

[0008] Structure 1: The whole is FPC cable;

[0009] Structure 2: The whole is PCB board;

[0010] Structure 3: A hybrid structure with part being FPC cable and part being PCB board.

[0011] Preferably, the connecting member comprises a conductive nickel sheet.

[0012] Preferably, the analog front-end circuit includes a plurality of temperature sensors for respectively collecting the temperature of each of the single cells. The temperature sensors are arranged at each location on the circuit board connected to the connector. The temperature sensors collect the temperature of the single cells through the connector and the contact electrodes.

[0013] Preferably, the analog front-end circuit and the circuit board share a ground terminal located on the surface of the circuit board.

[0014] Preferably, the supporting base plate includes a wire groove extending along its long axis direction, the circuit board is located in the wire groove, and a number of positioning grooves are arranged at intervals along the long axis direction on both sides of the wire groove. The contact electrode is located in the positioning groove, and a through hole is also provided in the positioning groove. The contact electrode includes an edge portion and a contact portion, and the contact portion abuts against the electrode of the single cell through the through hole.

[0015] The present invention also provides a battery module, which includes a box, a plurality of battery packs arranged in the box, and a battery management system, each of the batteries includes a plurality of single cells, and the battery management system includes a main control board and a plurality of highly integrated secondary battery management boards as described above, which are respectively adapted to each of the battery packs.

[0016] Preferably, each circuit board is provided with two communication connectors, and a pair of the communication connectors between two adjacent CCSs are connected by a signal line, so that the analog front-end circuits on several CCSs are communicatively connected to the main control board through the same communication line.

[0017] Preferably, several of the circuit boards are connected in series, wherein one of the circuit boards is provided with a total positive electrode, and another circuit board is provided with a total negative electrode, and the several circuit boards form a power supply circuit through the total positive electrode and the total negative electrode.

[0018] Compared with the existing technology, the secondary battery management board provided by the above technical solution of the utility model integrates the analog front-end circuit into the CCS, eliminates the independent slave control board (BCU) and the adapter harness for analog signal transmission, thereby effectively reducing the cost of the battery management board and improving the reliability of the battery management board; in addition, the management board using the above structure can effectively shorten the supply chain and simplify supply chain management for manufacturers. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1a 、 Figure 1b They are respectively the front and back planar structural diagrams of the CCS in the embodiment of the present utility model.

[0020] Figure 2 This is a planar structural diagram of the battery pack in an embodiment of the present utility model.

[0021] Figure 3 This is an exploded view of the CCS in the embodiment of the present utility model.

[0022] Figure 4 for Figure 1a Enlarged view of part A in the middle.

[0023] Figure 5 Schematic diagram of the assembly of the CCS and the battery pack in an embodiment of the present utility model.

[0024] Figure 6 This is a planar structural diagram of the battery module in an embodiment of the present utility model.

[0025] Figure 7 For Figure 6 A planar structural diagram of a battery management system that coordinates with each battery pack.

[0026] Figure 8 For Figure 6 Another planar structure diagram of the battery management system in which the battery packs cooperate.

[0027] Figure 9 This is a structural diagram of a battery management system within a battery module in the prior art. DETAILED DESCRIPTION

[0028] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the embodiments and the accompanying drawings.

[0029] This embodiment discloses a secondary battery management board for monitoring, managing, and balancing the working status of an entire battery pack including a plurality of secondary batteries (also called rechargeable batteries) to protect the batteries from damage.

[0030] like Figures 1a to 5The battery management board includes a battery connection assembly CCS disposed within the battery box. The CCS comprises a support base plate 10, a plurality of contact electrodes J1 disposed on the support base plate 10, and a circuit board 11. The contact electrodes J1 are electrically connected to the circuit board 11 via connectors 12. The contact electrodes J1 are used to abut against the electrodes J2 on the individual cells CE within the battery pack PA. It should be noted that a battery pack PA contains a plurality of individual cells CE.

[0031] The circuit board 11 also integrates an analog front-end circuit AFE (also called AFE), which is connected to the main control board outside the CCS via a communication signal line (such as Figure 7 ), the analog front-end circuit AFE is used to collect operating parameter data and control the working status of each single battery CE in the battery pack PA.

[0032] In this embodiment, compared to traditional BMS systems, the CCS not only connects and transmits signals but also integrates functional circuits. Specifically, the analog front-end circuit (AFE) is integrated into the CCS. This allows the AFE to directly collect operating parameter data and control the operating status of each battery cell CE via the circuit board 11. The AFE only needs to communicate with the main control board via communication signal lines.

[0033] Therefore, the battery management board cancels the independent slave control board BCU and the adapter harness X1 for analog signal transmission, such as Figure 9 , effectively reducing the cost of the battery management board. Secondly, due to the simplified circuit design, the line impedance between the single cell CE and the analog front-end circuit AFE is reduced, which is conducive to increasing the balancing current, for example, from 100mA to 300mA. Thirdly, for the production supply chain, the management board with the above structure eliminates the need for a slave control board and adapter cables, effectively shortening the supply chain and simplifying supply chain management. In addition, since the adapter cables do not need to be plugged in and out, it is easier to implement automated production and improve production efficiency.

[0034] On the other hand, the substrate of the circuit board 11 can be any of the following structures:

[0035] Structure 1: The whole is FPC cable;

[0036] Structure 2: The whole is PCB board;

[0037] Structure 3: A hybrid structure with part being FPC cable and part being PCB board.

[0038] On the other hand, the connecting member 12 comprises a conductive nickel sheet. Laser welding or ultrasonic welding can be used to weld one end of the conductive nickel sheet extending from the circuit board 11 to the contact electrode J1.

[0039] The analog front-end (AFE) circuit includes a voltage acquisition circuit, a current acquisition circuit, and a temperature acquisition circuit. The voltage acquisition circuit and the current acquisition circuit are used to acquire the voltage and current signals of the individual cells CE, respectively. The temperature acquisition circuit is used to acquire the temperature of the individual cells CE.

[0040] The temperature acquisition circuit in this embodiment includes a plurality of temperature sensors T for respectively acquiring the temperature of each single cell CE. The temperature sensor T is provided at each location on the circuit board 11 connected to the connector 12. The temperature sensor T acquires the temperature of the single cell CE through the connector 12 and the contact electrode J1.

[0041] In this embodiment, a temperature sensor T is configured for each single cell CE to achieve full sampling and monitoring of the temperatures of all single cells CE, thereby enabling a more comprehensive and accurate understanding of the temperature distribution of the battery pack PA.

[0042] In the traditional BMS architecture, Figure 9 Since the CCS needs to be connected to the slave control board BCU through the analog signal adapter harness X1, when the number of single cells CE in a battery pack PA is relatively large, if a temperature sensor T is configured for each single cell CE, the volume of the analog signal adapter harness will be greatly increased. Therefore, in practical applications, it is not possible to configure a temperature sensor T for each single cell CE.

[0043] On the other hand, the analog front-end circuit AFE and the circuit board 11 share a ground terminal located on the surface of the circuit board 11. In this way, the ground loop area can be reduced, electromagnetic interference can be reduced, and the quality of signal transmission can be improved.

[0044] On the other hand, Figure 3 The supporting base plate 10 includes a wire groove 100 extending along its long axis. The circuit board 11 is located in the wire groove 100. A number of positioning grooves 101 are provided on both sides of the wire groove 100 along the long axis. The contact electrode J1 is located in the positioning groove 101. A through hole 102 is also provided in the positioning groove 101. The contact electrode J1 includes an edge portion J10 and a contact portion J11. The contact portion J11 abuts against the electrode J2 of the single cell CE through the through hole 102.

[0045] Through the structure of the supporting base plate 10 in this embodiment, the contact electrodes J1 can be distributed on both sides of the circuit board 11 to effectively improve space utilization.

[0046] In another preferred embodiment of the present invention, a battery module is also disclosed. Figure 6 and Figure 7The battery management system comprises a main control board and a plurality of battery management boards respectively matched with each battery pack PA and having the above structure.

[0047] On the other hand, as Figure 7 Two communication connectors 3 are arranged on each circuit board 11, and a pair of communication connectors 3 between two adjacent CCSs are connected through a communication signal line, so that the analog front-end circuits AFE on the plurality of CCSs are connected with the main control board through the same communication line.

[0048] In addition, as Figure 8 Each circuit board 11 can also be directly connected to the loop of a communication bus (such as a CAN bus) through the two communication connectors 3.

[0049] On the other hand, the plurality of circuit boards 11 are connected in series, one of the circuit boards 11 is provided with a total positive electrode, and the other circuit board 11 is provided with a total negative electrode, and the plurality of circuit boards 11 form a power supply loop through the total positive electrode S1 and the total negative electrode S2.

[0050] The above only discloses preferred embodiments of the utility model, and of course cannot limit the scope of the utility model, so equivalent changes made in the scope of the utility model patent application still belong to the scope covered by the utility model.

Claims

1. A highly integrated secondary battery management board, characterized in that: It includes a battery connection assembly CCS arranged in a battery box, and the CCS includes a supporting base plate and a plurality of contact electrodes and a circuit board arranged on the supporting base plate. The contact electrodes are electrically connected to the circuit board through connectors, and the contact electrodes are used to abut against electrodes on single cells in the battery box; the circuit board also integrates an analog front-end circuit, and the analog front-end circuit is communicatively connected to a main control board located outside the CCS through a communication signal line, and the analog front-end circuit is used to collect working parameter data and control the working status of each single cell in the battery box.

2. The highly integrated secondary battery management board according to claim 1, characterized in that: The substrate of the circuit board is any of the following structures: Structure 1: The whole is FPC cable; Structure 2: The whole is PCB board; Structure 3: A hybrid structure with part being FPC cable and part being PCB board.

3. The highly integrated secondary battery management board according to claim 1, characterized in that: The connecting member includes a conductive nickel sheet.

4. The highly integrated secondary battery management board according to claim 1, characterized in that: The analog front-end circuit includes several temperature sensors for respectively collecting the temperature of each single cell. The temperature sensors are arranged at each location on the circuit board connected to the connector. The temperature sensors collect the temperature of the single cell through the connector and the contact electrode.

5. The highly integrated secondary battery management board according to claim 1, characterized in that: The analog front-end circuit and the circuit board share a ground terminal located on the surface of the circuit board.

6. The highly integrated secondary battery management board according to claim 1, characterized in that: The supporting base plate includes a wire groove extending along its long axis direction, the circuit board is located in the wire groove, and a plurality of positioning grooves are arranged at intervals along the long axis direction on both sides of the wire groove. The contact electrode is located in the positioning groove, and a through hole is also provided in the positioning groove. The contact electrode includes an edge portion and a contact portion, and the contact portion abuts against the electrode of the single battery through the through hole.

7. A battery module, characterized in that: It includes a box, several battery packs arranged in the box, and a battery management system, each of the batteries includes several single cells, and the battery management system includes a main control board and several highly integrated secondary battery management boards as described in any one of claims 1 to 6, which are respectively adapted to each of the battery packs.

8. The battery module according to claim 7, characterized in that: Each circuit board is provided with two communication connectors, and a pair of the communication connectors between two adjacent CCSs are connected by a signal line, so that the analog front-end circuits on several CCSs are communicated with the main control board through the same communication line.

9. The battery module according to claim 7, characterized in that: The plurality of circuit boards are connected in series, wherein one of the circuit boards is provided with a total positive electrode, and another circuit board is provided with a total negative electrode, and the plurality of circuit boards form a power supply circuit through the total positive electrode and the total negative electrode.

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