Battery cell monitoring unit system

Abstract

The utility model discloses a battery cell monitoring unit system, which comprises a battery cell monitoring unit and a switching circuit board, the battery cell monitoring unit comprises an AFE chip and a peripheral circuit, the peripheral circuit and the switching circuit board are used for connecting the AFE chip with battery cells in the battery module, and the switching circuit board is used for sorting battery cell signals and converting the battery cell signals into a connector arrangement sequence matched with the battery cell monitoring unit. In an application scene, the adapter plate is relatively simple in structure and low in development and test difficulty, so that under the condition that a technician only develops one type of CMU, the adapter plate is matched with the adapter circuit board and adjusts lines and connection through the adapter circuit board, the diversified requirements of multiple string numbers and multiple arrangement schemes of the battery cells can be met, development and test expenditures are saved, and the development and test efficiency is improved. The development verification time is shortened, and development requirements can be responded more quickly.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cell monitoring unit system. Background Art

[0002] With the continuous development of electric vehicles, users have an increasing demand for battery power. The richness of battery power has brought about the diversification of the arrangement and number of cells in the battery pack. Whenever new requirements arise, technicians need to design a cell control unit corresponding to the requirements. As a result, the corresponding versions of the cell monitoring unit (CMU) are also increasing, bringing a large number of heavy development and testing tasks, consuming a lot of manpower and material resources. Utility Model Content

[0003] Based on the above problems, the utility model provides a battery cell monitoring unit system to meet the needs of diversified battery cell arrangements without bringing about a large number of heavy development tasks and testing tasks.

[0004] The utility model embodiment discloses the following technical solution:

[0005] A battery cell monitoring unit system comprises a battery cell monitoring unit and a switching circuit board;

[0006] The battery cell monitoring unit includes an AFE chip and peripheral circuits. The peripheral circuits and adapter circuit board are used to connect the AFE chip and the battery cells in the battery module. The adapter circuit board is used to sort the battery cell signals and convert the battery cell signals into a connector arrangement sequence that is compatible with the battery cell monitoring unit.

[0007] Optionally, the peripheral circuit includes N sampling channels corresponding to the AFE chip, the adapter circuit board is connected to the AFE chip through the N sampling channels, the adapter circuit board is connected to the battery cells in the battery module through M battery cell connecting lines, and M and N are positive integers.

[0008] Optionally, when the number of battery cells is different from the number of sampling channels of the battery cell monitoring unit, the adapter board is used to adjust the internal circuit of the adapter circuit board to match the number of battery cell connecting lines with the number of sampling channels of the battery cell monitoring unit.

[0009] Optionally, when the output line arrangement sequence of the battery cell and the sampling channel arrangement sequence of the battery cell monitoring unit do not match, the adapter plate is used to adjust the output line arrangement sequence of the battery cell so that the adjusted output line arrangement sequence matches the sampling channel arrangement sequence of the battery cell monitoring unit.

[0010] Optionally, when the number of battery cells is different from the number of sampling channels of the battery cell monitoring unit, and the arrangement sequence of the output lines of the battery cells does not match the arrangement sequence of the sampling channels of the battery cell monitoring unit, the adapter board is used to adjust the internal circuit of the adapter circuit board and adjust the arrangement sequence of the output lines of the battery cells so that the number of battery cell connecting lines matches the number of sampling channels of the battery cell monitoring unit, and the adjusted arrangement sequence of the output lines matches the arrangement sequence of the sampling channels of the battery cell monitoring unit.

[0011] Optionally, the AFE chip is used to collect at least one of the voltage information of the battery cell, the current information of the battery cell, the temperature information of the battery cell, and the fault information of the battery cell.

[0012] Optionally, the battery module includes a plurality of battery cells connected in parallel or in series.

[0013] Optionally, the adapter board includes a PCB board, and the PCB board includes an inlet port and an outlet port of the sampling line, which are respectively connected to the AFE chip and the module battery cell.

[0014] Optionally, the adapter circuit board includes a soft board type or a hard board type adapter circuit.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model provides a battery cell monitoring unit system, including a battery cell monitoring unit and an adapter circuit board; the battery cell monitoring unit includes an AFE chip and a peripheral circuit, the peripheral circuit and the adapter circuit board are used to connect the AFE chip and the battery cells in the battery module, and the adapter circuit board is used to sort the battery cell signals and convert the battery cell signals into a connector arrangement sequence that is compatible with the battery cell monitoring unit. In the application scenario, the adapter board structure is relatively simple, and the development and testing difficulty is low, so that when the technicians only develop one CMU, they can adjust the lines and connections through the adapter circuit board to meet the diverse needs of multiple strings and multiple arrangement schemes of the battery cells, saving development and testing funds, shortening the development verification time, and responding to development needs more quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic diagram of a battery cell monitoring unit system provided by an embodiment of the utility model;

[0019] Figure 2 A schematic diagram of an application scenario of a battery cell monitoring unit system provided by an embodiment of the utility model;

[0020] Figure 3 A schematic diagram of an application scenario of a battery cell monitoring unit system provided by an embodiment of the utility model;

[0021] Figure 4 A schematic diagram of an application scenario of a battery cell monitoring unit system provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0022] As described above, with the continuous development of electric vehicles, users have an increasing demand for battery power. The richness of battery power has brought about the diversification of the arrangement and number of cells in the battery pack. As a result, the corresponding versions of the cell monitoring unit (CMU) have also increased, bringing a large number of heavy development and testing tasks.

[0023] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1 , Figure 1 A schematic diagram of a battery cell monitoring unit system provided for an embodiment of the utility model, which includes a battery cell monitoring unit and a converter circuit board; the battery cell monitoring unit includes an AFE chip and a peripheral circuit, the peripheral circuit and the converter circuit board are used to connect the AFE chip and the battery cells in the battery module, and the converter circuit board is used to organize the battery cell signals and convert the battery cell signals into a connector arrangement sequence compatible with the battery cell monitoring unit.

[0025] The adapter circuit board can convert the signal on one circuit board to the signal on another circuit board. The adapter circuit board is usually used to connect different types of circuit boards or to connect the circuit board to a computer or other device. The adapter circuit board is used to reorganize and sort the battery cell signals and convert the battery cell signals into the connector arrangement sequence that the CMU is compatible with. This design combination does not require the redesign of the complex CMU circuit board, but only requires the redesign of the conversion circuit board. This allows development designers to meet the diverse needs of multiple strings and multiple arrangement schemes of battery cells by developing only one CMU, saving development and testing funds, shortening development verification time, and responding to development needs more quickly.

[0026] In one possible implementation, the peripheral circuit includes N sampling channels corresponding to the AFE chip, the adapter circuit board is connected to the AFE chip through the N sampling channels, and the adapter circuit board is connected to the battery cells in the battery module through M battery cell connecting lines, where M and N are positive integers.

[0027] When designing CMU, full consideration should be given to the highest sampling channel that may be used in the future. It is recommended to use the sampling channel of AFE as much as possible. CMU is composed of AFE chip and peripheral circuits. Among them, AFE chip is one of the key chips in the collector, responsible for converting analog signals into digital signals for subsequent processing. The peripheral circuit can include various passive components and active components, such as capacitors, resistors, transistors, etc., which are used to support the work of AFE chip, and can also perform certain processing and filtering on the signal. Therefore, the CMU in this embodiment is composed of AFE chip and peripheral circuits.

[0028] In one possible implementation, when the number of battery cells is different from the number of sampling channels of the battery cell monitoring unit, the adapter board is used to adjust the internal circuit of the adapter circuit board to match the number of battery cell connecting lines with the number of sampling channels of the battery cell monitoring unit.

[0029] The number of cells refers to the number of cells in the battery pack. The number of CMU sampling channels refers to the number of cell sampling channels of the CMU module in the battery management system.

[0030] That is, the application scenario is that the number of battery cells and the number of CMU sampling channels are inconsistent. In this scenario, the number of battery cells and the number of AFE sampling channels are matched by adjusting the internal circuit of the adapter board. For connection diagrams, see Figure 2 , Figure 2 A schematic diagram of an application scenario of a battery cell monitoring unit system provided for an embodiment of the utility model, wherein the number of battery cells is 3 and the number of CMU sampling channels is 4. At this time, the number of battery cells and the number of CMU sampling channels are inconsistent. The internal circuit of the adapter board is adjusted to match the number of battery cells and the number of AFE sampling channels, thereby realizing the reorganization and sorting of the battery cell signals and converting the battery cell signals into a connector arrangement sequence compatible with the CMU.

[0031] In one possible implementation, when the output line arrangement sequence of the battery cell and the sampling channel arrangement sequence of the battery cell monitoring unit do not match, the adapter board is used to adjust the output line arrangement sequence of the battery cell so that the adjusted output line arrangement sequence matches the sampling channel arrangement sequence of the battery cell monitoring unit.

[0032] The cell output refers to the connection of the positive and negative poles of the cell to the circuit board through the electrode sheet and the lead wires on the cell shell, so as to output the electric energy of the cell. There are two ways to connect the cell output: welding and crimping. Among them, the welding method is to connect the cell lead to the circuit board by welding, while the crimping method is to connect the cell lead to the socket on the circuit board by crimping. The connection quality of the cell output directly affects the service life and safety performance of the mobile power supply.

[0033] That is, the application scenario is that the arrangement order of the battery cell output lines does not match the arrangement order of the CMU interface. In this scenario, the adapter board sorts and rearranges the order of the battery cell output lines to match the arrangement order of the CMU interface. Figure 3 , Figure 3 A schematic diagram of an application scenario of a battery cell monitoring unit system provided for an embodiment of the utility model, wherein the number of battery cells is 4 and the number of CMU sampling channels is 4. At this time, the number of battery cells is consistent with the number of CMU sampling channels, but the battery cells are arranged in order from battery cell 4 to battery cell 1, and the arrangement order of the CMU interface is channel 1 to channel 4. The arrangement order of the battery cell output lines and the arrangement order of the CMU interface cannot match. The adapter board sorts and rearranges the order of the battery cell output lines to match the arrangement order of the CMU interface, thereby realizing the reorganization and combing of the battery cell signals and converting the battery cell signals into a connector arrangement order compatible with the CMU.

[0034] In one possible implementation, when the number of battery cells is different from the number of sampling channels of the battery cell monitoring unit, and the arrangement sequence of the output lines of the battery cells does not match the arrangement sequence of the sampling channels of the battery cell monitoring unit, the adapter board is used to adjust the internal circuit of the adapter circuit board and adjust the arrangement sequence of the output lines of the battery cells so that the number of battery cell connecting lines matches the number of sampling channels of the battery cell monitoring unit, and the adjusted arrangement sequence of the output lines matches the arrangement sequence of the sampling channels of the battery cell monitoring unit.

[0035] That is, the application scenario is that the number of cells and the arrangement order of the cell output lines cannot match the interface of the CMU. In this scenario, the adapter board not only needs to adjust the sampling channel of the number of cells, but also rearrange the order of the cell output lines to match the arrangement order of the CMU interface. For connection diagrams, see Figure 4 , Figure 4A schematic diagram of an application scenario of a battery cell monitoring unit system provided for an embodiment of the utility model, wherein the number of battery cells is 3 and the number of CMU sampling channels is 4. At this time, the number of battery cells and the number of CMU sampling channels are inconsistent, and the battery cells are arranged in order from battery cell 3 to battery cell 1, and the arrangement order of the CMU interface is channel 1 to channel 4. The arrangement order of the battery cell output lines and the arrangement order of the CMU interface cannot match. The adapter board sorts and rearranges the output line order of the battery cells to match the arrangement order of the CMU interface, thereby realizing the reorganization and combing of the battery cell signals and converting the battery cell signals into a connector arrangement order adapted to the CMU.

[0036] In a possible implementation, the AFE chip is used to collect at least one of voltage information of the battery cell, current information of the battery cell, temperature information of the battery cell, and monitor fault information of the battery cell.

[0037] In the battery management system (BMS), the main function of the AFE chip is to monitor and protect the battery. During the charging and discharging process, the battery generates various signals, such as voltage, current, temperature, etc. The AFE chip can collect, process and analyze these signals to achieve battery monitoring and protection.

[0038] Specifically, the main functions of AFE chips in BMS include:

[0039] Voltage acquisition: The AFE chip can collect the voltage of each battery cell in the battery pack, so as to understand the status and capacity of the battery and determine whether there are problems such as overcharging, undercharging, and imbalance.

[0040] Current acquisition: The AFE chip can collect current information of the battery pack, including charging current and discharging current, so as to monitor the battery status and remaining capacity in real time.

[0041] Temperature acquisition: The AFE chip can collect the temperature information of the battery pack, so as to understand the temperature changes and thermal runaway of the battery and protect the battery from problems such as overheating.

[0042] Fault protection: The AFE chip can monitor the status and parameters of the battery pack in real time. When the battery has faults such as overcharge, over discharge, short circuit, etc., it can respond in time to protect the battery from damage.

[0043] In a possible implementation, the battery module includes a plurality of battery cells connected in parallel or in series.

[0044] The number of cells and modules in a battery pack are two important components of a battery pack. The number of cells in a battery pack depends on the design and application scenarios of the battery pack, while a battery module is composed of multiple cells. For example, a battery module can be composed of dozens or hundreds of cells, which can be connected in parallel or in series to meet different voltage and capacity requirements. The battery module also includes components such as a thermal management system, a battery management system (BMS), an electrical system, and structural parts to ensure the safety and performance stability of the battery.

[0045] For example, if a battery pack needs to provide high voltage and large capacity, it may need to consist of hundreds of battery cells that can be connected in parallel to provide sufficient current output. These battery cells can be assembled into multiple battery modules, each with its own thermal management system and BMS to ensure battery safety and performance stability. In addition, the design and application scenarios of the battery pack will also affect the number and size of battery modules. For example, some electric vehicles require large battery modules to provide sufficient driving range, while some portable electronic devices only need small battery modules to provide sufficient power.

[0046] In a possible implementation, the adapter board includes a PCB board, and the PCB board includes an inlet port and an outlet port of the sampling line, which are respectively connected to the AFE chip and the module battery cell.

[0047] In a possible implementation, the adapter circuit board includes a soft board type or a hard board type adapter circuit.

[0048] In summary, this solution allows developers to meet the diverse needs of multiple strings and multiple arrangements of cells by developing only one CMU, saving development and testing funds, shortening development and verification time, and responding to development needs more quickly. At the same time, the structure of the adapter board is relatively simple, and the development and testing difficulty is low. This combined design solution can reduce development and testing costs and improve product competitiveness.

[0049] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0050] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery cell monitoring unit system, characterized in that: Including a battery cell monitoring unit and a switching circuit board; The battery cell monitoring unit includes an AFE chip and peripheral circuits. The peripheral circuits and adapter circuit board are used to connect the AFE chip and the battery cells in the battery module. The adapter circuit board is used to sort the battery cell signals and convert the battery cell signals into a connector arrangement sequence that is compatible with the battery cell monitoring unit.

2. The battery cell monitoring unit system according to claim 1, characterized in that: The peripheral circuit includes N sampling channels corresponding to the AFE chip, the adapter circuit board is connected to the AFE chip through the N sampling channels, and the adapter circuit board is connected to the battery cells in the battery module through M battery cell connecting lines, where M and N are positive integers.

3. The battery cell monitoring unit system according to claim 1, characterized in that: When the number of battery cells is different from the number of sampling channels of the battery cell monitoring unit, the adapter circuit board is used to adjust the internal circuit of the adapter circuit board to match the number of battery cell connection lines with the number of sampling channels of the battery cell monitoring unit.

4. The battery cell monitoring unit system according to claim 1, characterized in that: When the output line arrangement sequence of the battery cell does not match the sampling channel arrangement sequence of the battery cell monitoring unit, the adapter circuit board is used to adjust the output line arrangement sequence of the battery cell so that the adjusted output line arrangement sequence matches the sampling channel arrangement sequence of the battery cell monitoring unit.

5. The battery cell monitoring unit system according to claim 1, characterized in that: When the number of battery cells is different from the number of sampling channels of the battery cell monitoring unit, and the arrangement sequence of the output lines of the battery cells does not match the arrangement sequence of the sampling channels of the battery cell monitoring unit, the adapter circuit board is used to adjust the internal circuit of the adapter circuit board and adjust the arrangement sequence of the output lines of the battery cells so that the number of battery cell connecting lines matches the number of sampling channels of the battery cell monitoring unit, and the adjusted arrangement sequence of the output lines matches the arrangement sequence of the sampling channels of the battery cell monitoring unit.

6. The battery cell monitoring unit system according to claim 1, characterized in that: The AFE chip is used to collect at least one of the voltage information of the battery cell, the current information of the battery cell, the temperature information of the battery cell, and the fault information of the battery cell.

7. The battery cell monitoring unit system according to claim 1, characterized in that: The battery module includes a plurality of battery cells connected in parallel or in series.

8. The battery cell monitoring unit system according to claim 1, characterized in that: The adapter circuit board includes a PCB board, and the PCB board includes an inlet port and an outlet port of a sampling line, which are respectively connected to the AFE chip and the module battery cell.

9. The battery cell monitoring unit system according to claim 1, characterized in that: The switching circuit board includes a soft board type or a hard board type switching circuit.

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