An onboard battery voltage detection component and system for a battery unit

Abstract

The present invention relates to an onboard battery voltage detection component and system of a battery unit, which is used to connect the battery unit, wherein the battery unit includes an anode plate and a cathode plate, the onboard battery voltage detection component is located between the anode plate and the cathode plate, and the onboard battery voltage detection component includes a microcontroller unit, the microcontroller unit is provided with a voltage detection contact group, a power supply contact group and a signal contact group, and the voltage detection contact group is electrically connected to the anode plate and the cathode plate respectively. Compared with the prior art, the present invention has the advantages of reducing the complexity of hardware wiring, reducing the complexity of assembly, improving the assembly automation rate, and improving the accuracy of the voltage detection results of each battery unit.

Description

Technical Field

[0001] The present invention relates to the technical field of battery voltage detection, and in particular to an onboard battery voltage detection component and system of a battery unit. Background Art

[0002] The battery pack is the core component of the battery system, and its performance directly affects the life and safety of the battery system. When the battery stack is running, it is necessary to monitor the voltage of each battery cell in real time to minimize the risk of battery performance degradation.

[0003] The invention with publication number CN1979181 discloses a fuel cell single cell voltage detection circuit, including a single-chip microcomputer U1, a decoding circuit U2, a CAN bus interface circuit U3, a plurality of photoelectric relay groups U4, and a voltage divider circuit U5. The decoding circuit U2 provides a driving signal for the photoelectric relay group U4, so that the single-chip microcomputer U1 can scan and measure the voltage of the fuel cell single cell. The output end of the decoding circuit U2 is connected to the input end of each photoelectric relay group U4, and the output ends of the plurality of photoelectric relay groups U4 are connected to the fuel cell single cell, and together with the voltage divider circuit U5, a voltage detection circuit is formed. The single-chip microcomputer U1 is connected to the input end of the decoding circuit U2 to control the decoder state, is connected to the CAN bus interface circuit U3, sends the fuel cell single cell voltage value to the CAN bus interface circuit, and is connected to the voltage divider circuit U5 to collect the fuel cell single cell voltage signal.

[0004] The fuel cell single cell voltage detection circuit is connected to each fuel cell single cell through the detection circuit, and then the voltage is scanned and measured by the single chip microcomputer to realize the collection of voltage signals. This scheme has the following defects:

[0005] 1. Each fuel cell needs to be wired separately. When connecting to the fuel cell voltage detection circuit, it is necessary to carefully distinguish the wiring of each metal probe, and the wiring is complicated.

[0006] 2. In the connection line between the fuel cell cell and the fuel cell cell voltage detection circuit, there is line resistance and external voltage interference, which causes measurement errors and affects the accuracy of the cell voltage detection results. Summary of the invention

[0007] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide an onboard battery voltage detection component and system for a battery unit that reduces the complexity of hardware wiring and has high accuracy of voltage detection results.

[0008] The purpose of the present invention can be achieved by the following technical solutions:

[0009] A battery cell onboard battery voltage detection component is used to connect the battery cell, the battery cell includes an anode plate and a cathode plate, the onboard battery voltage detection component is located between the anode plate and the cathode plate, the onboard battery voltage detection component includes a microcontroller unit, the microcontroller unit is provided with a voltage detection contact group, a power supply contact group and a signal contact group, the voltage detection contact group is electrically connected to the anode plate and the cathode plate respectively.

[0010] Furthermore, the onboard battery voltage detection component also includes a power supply isolation circuit, and the micro control unit is connected to the power supply contact group through the power supply isolation circuit.

[0011] Furthermore, the onboard battery voltage detection component also includes a signal isolation circuit, and the micro control unit is connected to the signal contact group through the signal isolation circuit.

[0012] Furthermore, the signal isolation circuit is an optocoupler isolation circuit.

[0013] Furthermore, the onboard battery voltage detection component is located at a corner of the anode plate and the cathode plate, and is fixedly connected to the anode plate and the cathode plate.

[0014] Furthermore, the shell of the onboard battery voltage detection assembly is respectively bonded or welded to the anode plate and the cathode plate.

[0015] The present invention also provides an onboard battery voltage detection system based on an onboard battery voltage detection component of a battery cell as described above, which is used to connect a battery, wherein the battery includes a plurality of the battery cells, and the onboard battery voltage detection component is provided between the anode plate and the cathode plate on both sides of each battery cell, the power supply contact groups in each onboard battery voltage detection component are connected in parallel through a power supply circuit, and the signal contact groups in each onboard battery voltage detection component are connected in parallel through a signal circuit.

[0016] Furthermore, the power supply circuit and the signal circuit both use a strip-shaped flexible PCB board.

[0017] Furthermore, the onboard battery voltage detection component also includes a power supply isolation circuit, and the micro control unit is connected to the power supply contact group through the power supply isolation circuit.

[0018] Furthermore, the onboard battery voltage detection component also includes a signal isolation circuit, and the micro control unit is connected to the signal contact group through the signal isolation circuit.

[0019] Furthermore, the signal isolation circuit is an optocoupler isolation circuit.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] (1) The present invention directly connects the anode plate and the cathode plate on both sides of the battery cell by setting a microcontroller, so as to perform a separate voltage detection on each battery cell. Compared with the method of connecting each battery cell and then inputting the voltage detection to the single-chip microcomputer in the prior art, the present invention reduces the defect of voltage detection error caused by the current transmission process of the battery cell, and only needs to perform parallel voltage wiring and signal wiring, and can be directly connected to the strip flexible PCB board. It only needs to connect the signal acquisition device and the power supply interface in parallel at both ends of the strip flexible PCB, which reduces the complexity of hardware wiring, reduces the complexity of assembly, and improves the assembly automation rate.

[0022] (2) Since the battery voltage of the battery unit is different from the power supply voltage and signal output voltage of the micro control unit, if the micro control unit is directly connected to the power supply and signal acquisition equipment, the battery voltage of the battery unit will interfere with them. The present invention sets up a power supply isolation circuit and a signal isolation circuit to avoid the interference of the battery voltage and improve the stability of the operation of the micro control unit and the reliability of signal transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the installation state of an onboard battery voltage detection component of a battery unit provided in an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the appearance of an onboard battery voltage detection component provided in an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the internal circuit of an onboard battery voltage detection component provided in an embodiment of the present invention;

[0026] In the figure, 1. on-board battery voltage detection component, 11. micro control unit, 12. power supply isolation circuit, 13. signal isolation circuit, 14. power supply contact group, 141. voltage input contact, 142. ground contact, 15. signal contact group, 151. sending contact, 152. receiving contact, 2. battery cell, 3. anode plate, 4. cathode plate. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] 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 invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0031] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] Example 1

[0034] like Figure 1 and Figure 2 As shown, this embodiment provides an onboard battery voltage detection component of a battery cell, which is used to connect a battery cell 2. The battery cell 2 includes an anode plate 3, a membrane electrode and a cathode plate 4 arranged in a stacked manner. The onboard battery voltage detection component 1 is located between the anode plate 3 and the cathode plate 4. The onboard battery voltage detection component 1 includes a microcontroller unit 11, which is provided with a voltage detection contact group, a power supply contact group 14 and a signal contact group 15. The voltage detection contact group is electrically connected to the anode plate 3 and the cathode plate 4 respectively. The microcontroller unit 11 receives external power supply through the power supply contact group 14, and outputs the cell voltage signal through the signal contact group 15 under the control of an external synchronization signal.

[0035] like Figure 3 As shown, in order to avoid the battery voltage interfering with the power supply voltage of the micro control unit 11, as a preferred embodiment, the on-board battery voltage detection component 1 also includes a power supply isolation circuit 12, and the micro control unit 11 is connected to the power supply contact group 14 through the power supply isolation circuit 12. The power supply contact group 14 includes a voltage input contact 141 and a ground contact 142.

[0036] In order to avoid the battery voltage interfering with the signal voltage of the microcontroller unit 11, as a preferred embodiment, the onboard battery voltage detection component 1 also includes a signal isolation circuit 13, and the microcontroller unit 11 is connected to the signal contact group 15 through the signal isolation circuit 13. The signal contact group 15 includes a sending contact 151 and a receiving contact 152.

[0037] The signal isolation circuit 13 is preferably an optocoupler isolation circuit, which is a circuit that transmits signals through light, and its specific structure is a prior art, which will not be described in detail herein.

[0038] In order to optimize the fixation and layout of the onboard battery voltage detection component 1, as a preferred embodiment, the onboard battery voltage detection component 1 is located at a corner of the anode plate 3 and the cathode plate 4, and is fixedly connected to the anode plate 3 and the cathode plate 4. The fixed connection method can be bonding, welding, etc.

[0039] The present embodiment also provides an onboard battery voltage detection system of an onboard battery voltage detection component of a battery cell based on any of the above embodiments, which is used to connect a battery, the battery comprising multiple battery cells 2, and is characterized in that an onboard battery voltage detection component 1 is provided between the anode plate 3 and the cathode plate 4 on both sides of each battery cell 2, the power supply contact groups 14 in each onboard battery voltage detection component 1 are connected in parallel through a power supply circuit, and the signal contact groups 15 in each onboard battery voltage detection component 1 are connected in parallel through a signal circuit.

[0040] Preferably, the power supply circuit and the signal circuit are both connected in parallel using a strip-shaped flexible PCB board, which reduces the complexity of hardware wiring, reduces the complexity of assembly, and improves the assembly automation rate.

[0041] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An onboard battery voltage detection system of an onboard battery voltage detection component of a battery unit, wherein the onboard battery voltage detection component is used to connect a battery unit (2), wherein the battery unit (2) comprises an anode plate (3) and a cathode plate (4), and wherein: The onboard battery voltage detection component (1) is located between the anode plate (3) and the cathode plate (4), and the onboard battery voltage detection component (1) comprises a microcontroller unit (11), the microcontroller unit (11) being provided with a voltage detection contact group, a power supply contact group (14) and a signal contact group (15), the voltage detection contact group being electrically connected to the anode plate (3) and the cathode plate (4) respectively; The onboard battery voltage detection component (1) further comprises a signal isolation circuit (13), and the micro control unit (11) is connected to the signal contact group (15) via the signal isolation circuit (13); The onboard battery voltage detection component (1) is located at a corner of the anode plate (3) and the cathode plate (4), and is fixedly connected to the anode plate (3) and the cathode plate (4); The onboard battery voltage detection system is used to connect a battery, which includes a plurality of battery cells (2), and is characterized in that an onboard battery voltage detection component (1) is provided between the anode plate (3) and the cathode plate (4) on both sides of each battery cell (2), the power supply contact groups (14) in each onboard battery voltage detection component (1) are connected in parallel via a power supply circuit, and the signal contact groups (15) in each onboard battery voltage detection component (1) are connected in parallel via a signal circuit.

2. The system according to claim 1, characterized in that The onboard battery voltage detection component (1) further comprises a power supply isolation circuit (12), and the micro control unit (11) is connected to the power supply contact group (14) via the power supply isolation circuit (12).

3. The system according to claim 1, characterized in that The signal isolation circuit (13) is an optical coupling isolation circuit.

4. The system according to claim 1, characterized in that The shell of the onboard battery voltage detection component (1) is respectively bonded or welded to the anode plate (3) and the cathode plate (4).

5. The system according to claim 1, characterized in that The power supply circuit and the signal circuit both use a strip-shaped flexible PCB board.

6. The system according to claim 1, characterized in that The onboard battery voltage detection component (1) further comprises a power supply isolation circuit (12), and the micro control unit (11) is connected to the power supply contact group (14) via the power supply isolation circuit (12).

7. The system according to claim 1, characterized in that: The onboard battery voltage detection component (1) further comprises a signal isolation circuit (13), and the micro control unit (11) is connected to the signal contact group (15) via the signal isolation circuit (13).

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