FPCB (Flexible Printed Circuit Board) structure for monitoring battery cell explosion-proof valve

Abstract

The utility model is applicable to the technical field of energy storage batteries, and provides an FPCB (Flexible Printed Circuit Board) structure for monitoring an explosion-proof valve of a battery cell, which comprises an FPCB circuit board and a nickel sheet connected with the FPCB circuit board, the nickel sheet is arranged in a strip shape, the two ends of the nickel sheet are connected with the FPCB, the FPCB is located on the battery cell module, the nickel sheet is located above the battery cell module, and the thinned position is connected with the battery cell tab of the battery cell unit through thinning design. A plurality of thinning holes are formed in the thinning position of the nickel sheet, the thinning holes are hollow holes, and thinning connecting parts of the nickel sheet are formed among the thinning holes. The thinning connecting part has a safe state and a fusing state; in a safe state, the output current of the battery cell unit passes through the nickel sheet; when the battery cell unit is in the fusing state, the thinning connecting part is fused by the output current of the battery cell unit, so that the thinning connecting part is disconnected, the state of the explosion-proof valve is monitored, and the safety and the reliability of the energy storage battery can be better guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage batteries, and in particular relates to an FPCB structure for monitoring an explosion-proof valve of a battery cell. Background Art

[0002] Energy storage batteries (such as lithium-ion batteries) are widely used in modern electric vehicles and renewable energy systems. In order to ensure the safety and reliability of energy storage batteries, it is crucial to monitor the battery status. In traditional energy storage battery PACK, CCS (Cells Contact System) is usually used to monitor the temperature and voltage of the battery cell. However, the existing technical solutions have the following problems:

[0003] 1. Limited monitoring methods: CCS can usually only monitor the temperature and voltage information at the battery cell tabs, and cannot monitor the explosion-proof valve inside the battery cell.

[0004] 2. Single monitoring method: In the existing technology, the monitoring of battery cells mainly relies on monitoring the temperature and voltage information at the battery cell tabs through nickel sheets. However, if the CCS fails or fails to accurately monitor the battery cell, the battery cell failure cannot be discovered in time.

[0005] 3. Lack of monitoring of battery cell explosion-proof valves: In the existing technology, there is no effective means to monitor the battery cell explosion-proof valves, which is an important component of battery cell safety.

[0006] Therefore, the existing technology has limitations in monitoring the status of battery cells and cannot meet the needs of complex operating conditions and actual operation processes. Utility Model Content

[0007] In view of the above problems, the utility model provides an FPCB structure for monitoring the explosion-proof valve of the battery cell. The FPCB structure adds a monitoring nickel sheet connected to the FPCB circuit board to the explosion-proof valve of the battery cell, and performs a thinning design on it to realize the monitoring of the explosion-proof valve status. When a short circuit occurs in the battery cell, the explosion-proof valve will spray gas and increase the temperature, causing the nickel sheet located above the explosion-proof valve to be damaged and disconnected. The FPCB board identifies the circuit-breaking state at this location, realizes the monitoring of the explosion-proof valve of the battery cell, and then realizes the real-time monitoring of the battery cell status, which can better ensure the safety and reliability of the energy storage battery.

[0008] The utility model is implemented in this way. In a first aspect, the utility model provides an FPCB structure for monitoring an explosion-proof valve of a battery cell, comprising:

[0009] FPCB circuit board, located on the battery module;

[0010] The nickel sheet connected to the FPCB circuit board is located above the battery cell module. After a thinning design, the thinned position is connected to the battery cell ear of the battery cell unit.

[0011] Furthermore, the nickel sheets are arranged in strips and both ends are connected to the FPCB circuit board.

[0012] Furthermore, the thinning positions of the nickel sheet are arranged in sequence along the arrangement direction of the battery cell units, and each thinning position corresponds to a corresponding battery cell unit.

[0013] Furthermore, a plurality of thinning holes are arranged at the thinning positions of the nickel sheet, the thinning holes are hollow holes, and thinning connecting parts of the nickel sheet are formed between the thinning holes.

[0014] Furthermore, the thinned connection portion has a fuse structure for overload protection, which is disconnected in a fuse state to stop current transmission and allows the output current of the battery cell unit to pass in a safe state.

[0015] Furthermore, the thinned connection portion has a safe state and a fuse state; when in the safe state, the output current of the battery cell unit passes through the nickel sheet; when in the fuse state, the output current of the battery cell unit fuses the thinned connection portion to disconnect the thinned connection portion.

[0016] Furthermore, the width of the fuse structure is ≤1 mm.

[0017] Furthermore, when a short circuit occurs in the battery cell unit, the battery cell unit will emit gas and the temperature will rise, damaging the nickel sheet at the battery cell unit, disconnecting the nickel sheet, and the FPCB circuit board identifies the open circuit state at the thinned position of the nickel sheet.

[0018] Furthermore, the connection and disconnection of the nickel sheet is used to identify the state of the battery cell explosion-proof valve.

[0019] Furthermore, the FPCB circuit board also includes a temperature sensor and a voltage sensor for monitoring the temperature information and voltage information of the battery cell. The FPCB circuit board obtains the temperature information and voltage information of the battery cell unit through the nickel sheet connected to the battery cell tab.

[0020] Furthermore, the FPCB circuit board also includes a control circuit for monitoring and controlling the state of the battery cell explosion-proof valve and communicating with external equipment through a signal line connected to the nickel sheet.

[0021] Furthermore, the FPCB circuit board monitors the state of the battery cell through a CCS system in contact with the battery cell tabs.

[0022] Compared with the prior art, the FPCB structure of the utility model for monitoring the explosion-proof valve of the battery core has the following beneficial effects:

[0023] 1. Improved safety: Since the nickel sheet in the FPCB structure is provided with multiple thinning holes at the thinning position to form a small fuse structure, when the battery cell is overloaded or short-circuited, these fuse structures can quickly disconnect the current transmission and prevent the battery from overheating, fire or damage in time, thereby improving the safety performance of the battery system.

[0024] 2. Enhanced reliability: The thinning connection of the nickel sheet is finely designed. Since the width of the fuse structure at the thinning connection is designed to be no more than 1 mm, it can be quickly fused when an electrical failure occurs, and the rapid response protects the battery cell from damage, which enhances the protection function of the battery management system, ensures that the battery can be reliably protected under abnormal circumstances, and reduces the impact of the failure on the battery as a whole.

[0025] 3. Accurate monitoring is achieved: The temperature and voltage sensors integrated in the FPCB circuit board can accurately monitor the status of the battery cells, and the circuit board also includes a control circuit, which can not only obtain the temperature and voltage information of the battery cells in real time, but also judge the working status of the battery cells through data processing, and communicate with external devices, realizing comprehensive monitoring and remote management of the battery cell status, so that the battery management system can accurately evaluate the working condition of the battery and make timely adjustments or alarms.

[0026] 4. Improved maintenance efficiency: The integrated control circuit can process sensor data and communicate with external devices through signal lines to achieve real-time transmission and remote monitoring of battery status information, facilitating timely maintenance or rescue measures; when a battery cell fails, the FPCB circuit board can detect the open circuit state at the thinning position of the nickel sheet, which is convenient for maintenance personnel to quickly locate the problem unit and improve the efficiency and convenience of battery maintenance.

[0027] 5. Extended service life: By preventing dangerous situations such as overcharging, overheating and short circuit, the battery life can be effectively extended, the replacement frequency can be reduced, and the long-term use cost can be reduced. In addition, the thinned connection part of the FPCB structure design has a certain environmental adaptability, can work stably under different temperature and pressure conditions, and is suitable for battery safety monitoring in various environments.

[0028] In summary, the FPCB structure of the present invention provides an efficient, reliable and cost-effective solution for battery safety management, which is of great significance for improving the overall safety and performance of battery-containing products such as electric vehicles and portable electronic devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The utility model is a structural schematic diagram of an FPCB structure for monitoring an explosion-proof valve of a battery cell provided by the utility model.

[0030] Figure 2 The utility model provides a structural schematic diagram of a FPCB circuit board connected to a nickel sheet in an FPCB structure for monitoring an explosion-proof valve of a battery cell.

[0031] Figure 3 The utility model Figure 2 A is a partial enlarged schematic diagram of the middle part.

[0032] Reference numerals:

[0033] 1-battery cell module, 11-battery cell unit, 12-battery cell tab, 2-FPCB circuit board, 3-nickel sheet, 31-thinning hole, 32-thinning connection part. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0035] In the energy storage battery PACK, CCS (Cells Contact System) can usually only monitor the temperature and voltage at the cell tabs, and cannot monitor the explosion-proof valves of the cells. If a short circuit occurs in the cell, and the CCS monitoring method at the cell tabs fails, there is no other means to monitor the cell failure. The monitoring method is relatively simple and cannot meet the complex operating conditions in the actual operation process. When a short circuit occurs in the cell, the CCS monitors the temperature and voltage information at the cell tabs through nickel sheets. The monitoring method is simple. If it fails, there is no other means to monitor the condition of the cell.

[0036] The utility model provides an FPCB structure for monitoring the explosion-proof valve of a battery cell. A monitoring nickel sheet connected to the FPCB circuit board is added to the explosion-proof valve of the battery cell, and the monitoring nickel sheet is thinned to realize the monitoring of the explosion-proof valve state. When a short circuit occurs in the battery cell, the explosion-proof valve will spray gas and increase the temperature, causing the nickel sheet located above the explosion-proof valve to be damaged and disconnected. The FPCB board identifies the circuit-breaking state at this location, realizes the monitoring of the explosion-proof valve of the battery cell, and then realizes the real-time monitoring of the battery cell state, which can better ensure the safety and reliability of the energy storage battery.

[0037] Embodiment 1

[0038] See also Figures 1 to 3As shown, an FPCB structure for monitoring a battery cell explosion-proof valve provided by an embodiment of the utility model includes an FPCB circuit board 2 and a nickel sheet 3 connected to the FPCB circuit board 2. The nickel sheet 3 is arranged in a strip shape and connected to the FPCB circuit board 2 at both ends. During installation, the FPCB circuit board 2 is located on the battery cell module 1, and the nickel sheet 3 is located above the battery cell module 1 and is designed to be thinned, and the thinned position is connected to the battery cell tab 12 of the battery cell unit 11 in the battery cell module 1.

[0039] In this embodiment, the thinning positions of the nickel sheet 3 are sequentially arranged along the arrangement direction of the battery cell units 11, and each thinning position corresponds to a corresponding battery cell unit 11. A plurality of thinning holes 31 are arranged at the thinning positions of the nickel sheet 3, and the thinning holes 31 are hollow holes, and thinning connecting portions 32 of the nickel sheet 3 are formed between the thinning holes 31.

[0040] The thinned connection portion 32 of the nickel sheet 3 forms a fuse structure with overload protection, the width of the fuse structure is ≤1 mm, the fuse structure is disconnected in the fuse state to stop current transmission, and allows the output current of the battery cell unit 11 to pass in a safe state.

[0041] Therefore, in the nickel sheet 3 with a thinning design, the thinned connection part 32 has a safe state and a fuse state; when in the safe state, the output current of the battery cell unit 11 passes through the nickel sheet 3; when in the fuse state, the output current of the battery cell unit 11 fuses the thinned connection part 32 to disconnect the thinned connection part 32.

[0042] When a short circuit occurs in the battery cell 11, the battery cell 11 sprays gas and the temperature rises, destroying the nickel sheet 3 at the battery cell 11 and disconnecting the nickel sheet 3. The FPCB circuit board 2 identifies the short circuit state at the thinned position of the nickel sheet 3. The disconnection of the nickel sheet 3 is used to identify the state of the battery cell explosion-proof valve.

[0043] In this embodiment, the nickel sheet 3 is connected to the FPCB circuit board 2 and is arranged in sequence along the arrangement direction of the battery cell unit 11. The specific area of ​​the nickel sheet 3 is thinned to form a thinned connection part 32 with a fuse function. The connection part between the multiple hollow thinning holes 31 arranged in the thinning area is the fuse structure of the thinned connection part 32, and its width is set to not more than 1mm, so that under overload or abnormal conditions, the connection part can be quickly fused, thereby interrupting the transmission of current. When the FPCB circuit board 2 is installed on the battery cell module 1, the nickel sheet 3 is located above the battery cell and is connected to the battery cell tab 12 of the battery cell unit 11 in the battery cell module through the thinned position, thereby forming an FPCB structure for monitoring the state of the battery cell explosion-proof valve.

[0044] Under normal working conditions, the output current of the battery cell 11 passes through the nickel sheet 3. Since the thinned connection portion 32 is designed to withstand normal working current, the circuit remains closed and the current can pass smoothly. When an abnormality occurs in the battery cell 11 (such as a short circuit), the temperature rises, or gas is ejected, this abnormality will cause a sharp increase in the current passing through the thinned connection portion 32. Due to the narrow design of the thinned connection portion 32 (the width of the fuse structure is ≤1mm), it will quickly reach its fuse point and disconnect.

[0045] After the fusing, the disconnection state of the thinned connection portion 32 can be detected by the FPCB circuit board 2. This disconnection not only stops the transmission of current and prevents possible further thermal runaway, but also provides a clear signal that the battery cell unit 11 needs to be inspected or replaced.

[0046] The FPCB structure designed and formed in the above manner for monitoring the state of the explosion-proof valve of the battery cell improves safety and can disconnect the circuit in time when the battery cell is abnormal, preventing potential safety accidents such as battery overheating or fire. It also has the function of real-time monitoring. The FPCB circuit board 2 can monitor the state of the battery cell in real time and respond quickly when the thinned connection part 32 is blown to ensure system reliability. The maintenance cost is simplified. Through the disconnection state detected by the FPCB circuit board 2, the battery cell unit 11 with problems can be quickly located, which is convenient for maintenance and replacement; moreover, the thinning design of the nickel sheet 3 and the fusing characteristics of the thinned connection part 32 provide a cost-effective solution, reducing the need for complex electronic monitoring systems; the size and shape of the thinned connection part 32 can be designed according to different application requirements, providing high adaptability.

[0047] At the same time, the stability is also improved, the failure of the entire battery pack due to a short circuit of the battery cell is avoided, and the overall stability and reliability of the system are improved. Therefore, the embodiment of the utility model provides a simple, reliable and cost-effective way to monitor and protect the battery cells through the design combined with the nickel sheet 3 on the FPCB circuit board 2, thereby improving the safety and stability of the battery system.

[0048] Embodiment 2

[0049] The embodiment of the utility model also provides an FPCB structure for monitoring the explosion-proof valve of a battery cell. Different from the first embodiment, in this embodiment, the PCB circuit board 2 of the FPCB structure for monitoring the explosion-proof valve of the battery cell includes a temperature sensor and a voltage sensor for monitoring the temperature information and voltage information of the battery cell. The FPCB circuit board 2 obtains the temperature information and voltage information of the battery cell unit 11 through the nickel sheet 3 connected to the battery cell tab 12.

[0050] In this embodiment, the FPCB circuit board 2 also includes a control circuit for monitoring and controlling the state of the battery cell explosion-proof valve and communicating with external devices through a signal line connected to the nickel sheet 3. The FPCB circuit board 2 monitors the state of the battery cell through the CCS system in contact with the battery cell tab 12.

[0051] In this embodiment, the temperature sensor and the voltage sensor are integrated on the FPCB circuit board 2. Through the nickel sheet 3 connected to the battery cell tab 12, the temperature sensor and the voltage sensor can directly obtain the temperature information and voltage information of the battery cell unit 11. In addition, the FPCB circuit board 2 also includes a control circuit, which is responsible for monitoring the battery cell state and controlling the opening and closing of the explosion-proof valve. In addition, the control circuit can communicate with external devices through the signal line connected to the nickel sheet 3 to realize remote monitoring of the battery cell state.

[0052] Under normal working conditions, the temperature sensor monitors the temperature of the battery cell 11 in real time. Once it is detected that the temperature exceeds the safety threshold, the control circuit will take corresponding measures, such as adjusting the charging current, disconnecting or notifying the external system. The voltage sensor monitors the voltage of the battery cell 11 in real time. Through continuous monitoring, the control circuit can detect voltage anomalies in time to avoid overcharging or over-discharging. The control circuit analyzes the temperature and voltage data provided by the sensor to determine whether the battery cell 11 is operating normally. If an abnormality is detected, the control circuit can respond quickly and take necessary safety measures. The control circuit also communicates with external devices through signal lines to transmit battery cell status information to achieve remote monitoring and management.

[0053] The FPCB structure designed and formed in the above manner for monitoring the state of the explosion-proof valve of the battery cell has improved accuracy. The integrated temperature and voltage sensors can monitor the working state of the battery cell more accurately and detect problems in time. The control effect is enhanced. The addition of the control circuit enables the system to automatically respond to abnormal situations without manual intervention, which improves the intelligence level of the battery management system. Remote monitoring is realized. Through the communication capability with external devices, remote monitoring of the battery cell state is realized, which facilitates the management work of the operation and maintenance personnel. Safety is improved. The real-time monitoring and rapid response mechanism can take timely measures when abnormalities occur in the battery cell, greatly improving the safety of the entire system. Fault prevention can also be carried out. By continuously monitoring the temperature and voltage of the battery, faults caused by abnormal battery status can be prevented and maintenance measures can be taken in advance. In addition, the FPCB structure can be easily integrated into the existing battery management system without large-scale changes, which is convenient for promotion and application.

[0054] This embodiment integrates a temperature sensor and a voltage sensor in the FPCB structure and cooperates with the control circuit to not only monitor and control the status of the battery cell explosion-proof valve, but also provide more comprehensive battery cell status information, which helps to improve the operating safety and efficiency of the battery system.

[0055] In summary, the FPCB structure of the utility model for monitoring the explosion-proof valve of the battery cell significantly improves the safety of the battery, realizes efficient battery status monitoring and maintenance, reduces safety risks, and enhances the intelligence of the system. Through this technology, failures caused by abnormal battery temperature or voltage can be prevented, and necessary measures can be taken in advance to protect the stable operation of the battery system. This integrated and intelligent monitoring solution provides strong technical support for the safe management and long-term stable operation of the battery.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An FPCB structure for monitoring an explosion-proof valve of a battery cell, characterized in that: include: An FPCB circuit board (2) is located on the battery cell module (1); The nickel sheet (3) connected to the FPCB circuit board (2) is located above the battery cell module (1) and is designed to be thinned. The thinned position is connected to the battery cell tab (12) of the battery cell unit (11).

2. The FPCB structure for monitoring the explosion-proof valve of the battery cell according to claim 1, characterized in that: The nickel sheets (3) are arranged in a strip shape and both ends are connected to the FPCB circuit board (2).

3. The FPCB structure for monitoring the explosion-proof valve of the battery cell according to claim 2, characterized in that: The thinning positions of the nickel sheet (3) are arranged in sequence along the arrangement direction of the battery cell units (11), and each thinning position corresponds to a corresponding battery cell unit (11).

4. The FPCB structure for monitoring the explosion-proof valve of the battery cell according to claim 3, characterized in that: A plurality of thinning holes (31) are arranged at the thinning position of the nickel sheet (3); the thinning holes (31) are hollow holes, and thinning connecting parts (32) of the nickel sheet (3) are formed between the thinning holes (31).

5. The FPCB structure for monitoring the explosion-proof valve of the battery cell according to claim 4, characterized in that: The thinned connection portion (32) has an overload protection fuse structure, which is disconnected in a fuse state to stop current transmission, and allows the output current of the battery cell unit (11) to pass in a safe state.

6. The FPCB structure for monitoring the explosion-proof valve of the battery cell according to claim 5, characterized in that: The width of the fuse structure is ≤1 mm.

7. The FPCB structure for monitoring the explosion-proof valve of the battery cell according to claim 4, characterized in that: The thinned connection portion (32) has a safe state and a fuse state; when in the safe state, the output current of the battery cell unit (11) passes through the nickel sheet (3); when in the fuse state, the output current of the battery cell unit (11) fuses the thinned connection portion (32), so that the thinned connection portion (32) is disconnected.

8. The FPCB structure for monitoring the explosion-proof valve of a battery cell according to claim 1, characterized in that: The FPCB circuit board (2) also includes a temperature sensor and a voltage sensor for monitoring the temperature information and voltage information of the battery cell. The FPCB circuit board (2) obtains the temperature information and voltage information of the battery cell unit (11) through the nickel sheet (3) connected to the battery cell tab (12).

9. The FPCB structure for monitoring the explosion-proof valve of the battery cell according to claim 8, characterized in that: The FPCB circuit board (2) also includes a control circuit for monitoring and controlling the state of the battery core explosion-proof valve and communicating with external equipment via a signal line connected to the nickel sheet (3).

10. The FPCB structure for monitoring the explosion-proof valve of the battery cell according to claim 9, characterized in that: The FPCB circuit board (2) monitors the state of the battery cell through a CCS system in contact with the battery cell tab (12).

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