A protection system for an electrical cell

Abstract

The application discloses a protection system of an electric core, and has an electric core pressure protection device, which comprises a fuse circuit, a conversion circuit and a master control circuit, wherein the fuse circuit and the conversion circuit are connected with the master control circuit. The application has the advantages of realizing automatic fusing of the electric connection between the electric core and the load of the electric core in time, and protecting the electric core from explosion when the pressure increase is too large.

Description

Technical Field

[0001] This application relates to the technical field of battery cell protection, and in particular to a battery cell protection system. Background Technology

[0002] With the increasingly widespread application of new energy batteries, accidents involving the explosion and combustion of new energy batteries due to improper use occur frequently. In particular, during the overcharging or rapid charging of new energy batteries, the internal pressure of the battery cells increases sharply. If the input and output circuits of the battery cells are not disconnected in time, it is very easy to cause the internal cells of the new energy battery to explode and burn, thus leading to the accident. In the relevant existing technical solutions, there is a lack of real-time monitoring and disconnection schemes for the internal pressure of new energy battery cells, making it difficult to disconnect the input and output circuits of the battery cells in time. Summary of the Invention

[0003] To overcome the shortcomings of existing related technical solutions, this application provides a battery cell protection system.

[0004] In a first aspect, this application provides a battery cell protection system, which may include:

[0005] The pressure increase threshold setting module is used to set the pressure increase value threshold of the battery cell according to the parameters of the battery cell.

[0006] A real-time monitoring module is used to monitor the pressure of the battery cell in real time through a battery cell pressure protection device;

[0007] The fuse module is used to disconnect the electrical connection between the battery cell and its load when the detected pressure increase value of the battery cell exceeds the pressure increase threshold, thereby stopping the battery cell from inputting and outputting current.

[0008] In a preferred example, the solution of the second aspect of this application can be further configured as follows:

[0009] The protection system for the battery cell may further include:

[0010] The cell parameter adjustment module is used to adjust the parameters of the cell based on the analysis results obtained from analyzing the pressure increase value data of the cell.

[0011] In a preferred example, the solution of the second aspect of this application can be further configured as follows:

[0012] The cell pressure protection device may include:

[0013] The system includes a fuse circuit, a conversion circuit, and a main control circuit. The fuse circuit and the conversion circuit are both connected to the main control circuit. The fuse circuit is used to break the electrical connection between the battery cell and its load when the detected pressure increase value of the battery cell exceeds the pressure increase threshold. The conversion circuit is used to convert the detected battery cell pressure into an electrical signal. The main control circuit is used to control the fuse circuit and the conversion circuit. The main control circuit includes a first resistor R1, a first capacitor C1, a second capacitor C2, and an IC chip. One end of the first resistor R1 is connected to one end of the load Z (EB+), and the other end of the first resistor R1 is connected to pin 1 of the IC chip. One end of the first capacitor C1 is connected to pin 2 of the IC chip, and the other end of the first capacitor C1 is connected to the VCC pin of the IC chip. One end of the second capacitor C2 is connected to the VCC pin of the IC chip, and the other end of the second capacitor C2 is connected to the GND pin of the IC chip. The fuse circuit includes an electronic fuse FU and a second resistor R2, which is a variable resistor. One end of the electronic fuse FU is connected to one end of the first resistor R1 in the main control circuit, and the other end of the electronic fuse FU is connected to one end of the second resistor R2. The other end of the second resistor R2 is connected to the output pin c of the operational amplifier U in the conversion circuit. The conversion circuit includes an operational amplifier U and a third resistor R3. The circuit includes a fourth resistor R4, a pressure sensor SUP, a fifth resistor R5, a battery cell GB, a sixth resistor R6, and a seventh resistor R7. Pin c of the operational amplifier U is connected to the fuse circuit. Pin a of the operational amplifier U is connected to one end of the fifth resistor R5. The other end of the fifth resistor R5 is connected to the positive terminal of the battery cell GB. The negative terminal of the battery cell GB is connected to the other end EB- of the load Z. The other end of the fifth resistor R5 is also connected to one end of the seventh resistor R7. The other end of the seventh resistor R7 is connected to the other end of the sixth resistor R6. One end of the third resistor R3 is connected to pin c of the operational amplifier U. The other ends of the third resistor R3 and one end of the fourth resistor R4 are both connected to pin b of the operational amplifier U. The other end of the fourth resistor R4 is connected to one end of the pressure sensor SUP. The other end of the pressure sensor SUP is connected to one end of the sixth resistor R6. The other end of the sixth resistor R6 is connected to the VCC pin of the IC chip in the main control circuit.

[0014] In a preferred example, the solution of the second aspect of this application can be further configured as follows:

[0015] The protection system for the battery cell may further include:

[0016] An electrical connection disconnection module is used to disconnect the electrical connection between all cells in a new energy battery pack composed of cells when the pressure increase value of the cell is detected to exceed the pressure increase threshold.

[0017] Secondly, this application provides a method for protecting a battery cell, which may include the following steps:

[0018] Set the threshold value for pressure increase of the battery cell according to the cell parameters;

[0019] The pressure of the battery cell is monitored in real time through a cell pressure protection device;

[0020] When the detected pressure increase value of the battery cell exceeds the pressure increase threshold, the electrical connection between the battery cell and the battery cell load is broken, causing the battery cell to stop inputting and outputting current.

[0021] In a preferred example, the solution of the first aspect of this application can be further configured as follows:

[0022] In the step of melting the electrical connection between the battery cell and its load when the detected pressure increase value of the battery cell exceeds the pressure increase threshold, thereby stopping the battery cell from inputting and outputting current, the method for determining that the pressure increase value of the battery cell exceeds the pressure increase threshold includes the following expression:

[0023] ,

[0024] In the formula, This indicates the initial pressure value of the battery cell. This indicates the pressure value after the cell pressure increases. Indicates the threshold for pressure increase. Indicates the time it takes for the cell pressure to increase. , It is a constant.

[0025] In a preferred example, the solution of the first aspect of this application can be further configured as follows:

[0026] In the step of setting the pressure increase threshold of the battery cell according to the parameters of the battery cell, the method for setting the pressure increase threshold includes the following expression:

[0027] ,

[0028] In the formula, Indicates the threshold for pressure increase. Indicates the first cell One parameter, Indicates the first The weights of each parameter, , It is a positive integer. This indicates the total number of cell parameters. This indicates the standard value for the pressure increase of the battery cell.

[0029] In a preferred example, the solution of the first aspect of this application can be further configured as follows:

[0030] The method for protecting a battery cell may further include the following steps:

[0031] When the pressure increase value of the battery cell exceeds the pressure increase threshold, the electrical connection between all the battery cells in the new energy battery pack is disconnected.

[0032] In a preferred example, the solution of the first aspect of this application can be further configured as follows:

[0033] The method for protecting a battery cell may further include the following steps:

[0034] Based on the analysis results obtained from analyzing the pressure increase data of the battery cell, the parameters of the battery cell are adjusted.

[0035] In a preferred example, the solution of the first aspect of this application can be further configured as follows:

[0036] In the step of adjusting the parameters of the battery cell based on the analysis results obtained from analyzing the pressure increase value data of the battery cell, the parameter adjustment method of the battery cell includes the following expression:

[0037] ,

[0038] In the formula, Indicates the adjusted number Individual cell parameters Indicates the number before adjustment Individual cell parameters This indicates the initial pressure value of the battery cell. This indicates the pressure value after the cell pressure increases. Indicates the time it takes for the cell pressure to increase. .

[0039] Thirdly, this application provides a storage medium including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, it implements the steps of the protection method for the battery cell.

[0040] In summary, compared with the prior art, this application has at least the following beneficial effects:

[0041] 1. A battery cell protection system of this application monitors the pressure of the battery cell in real time. When the pressure increase value of the battery cell exceeds a preset pressure increase threshold, the system automatically melts the electrical connection between the battery cell and the load of the battery cell, thereby protecting the battery cell from explosion when the pressure increase is too large.

[0042] 2. The present application provides a battery cell protection system that sets a reasonable pressure increase threshold for the battery cell based on its parameters. This system protects the battery cell from explosion when the pressure increase is too large, without adversely affecting the normal operation of the battery cell. Attached Figure Description

[0043] Figure 1 This is a flowchart of the battery cell protection method according to an embodiment of this application.

[0044] Figure 2 This is a block diagram of the protection system structure for the battery cell in an embodiment of this application.

[0045] Figure 3 This is a schematic diagram of the specific circuit within the battery cell pressure protection device according to an embodiment of this application. Detailed Implementation

[0046] The following description, in conjunction with the accompanying drawings, provides a more detailed account of this application.

[0047] Example:

[0048] like Figure 1 The diagram shown is a flowchart of the battery cell protection method in this embodiment. The battery cell protection method in this embodiment may specifically include the following steps:

[0049] Set the threshold value for pressure increase of the battery cell according to the cell parameters;

[0050] The pressure of the battery cell is monitored in real time through a cell pressure protection device;

[0051] When the detected pressure increase value of the battery cell exceeds the pressure increase threshold, the electrical connection between the battery cell and the battery cell load is broken, causing the battery cell to stop inputting and outputting current.

[0052] In one preferred embodiment, in the step of melting the electrical connection between the battery cell and its load when the detected pressure increase value of the battery cell exceeds the pressure increase threshold, thereby stopping the battery cell from inputting and outputting current, the method for determining that the pressure increase value of the battery cell exceeds the pressure increase threshold includes the following expression:

[0053] ,

[0054] In the formula, This indicates the initial pressure value of the battery cell. This indicates the pressure value after the cell pressure increases. Indicates the threshold for pressure increase. Indicates the time it takes for the cell pressure to increase. , This indicates a search for the limit. It is a constant. Represents the cosine function. This represents a logarithm with a base of 10.

[0055] Through the above preferred embodiments, it is possible to efficiently and quickly determine whether the pressure increase value of the battery cell exceeds the pressure increase threshold. When the above formula is satisfied, it is determined that the pressure increase value of the battery cell exceeds the pressure increase threshold.

[0056] As one preferred embodiment, in the step of setting the pressure increase threshold of the battery cell according to the parameters of the battery cell, the method for setting the pressure increase threshold includes the following expression:

[0057] ,

[0058] In the formula, Indicates the threshold for pressure increase. Indicates the first cell One parameter, Indicates the first The weights of each parameter, , It is a positive integer. This indicates the total number of cell parameters. This indicates the standard value for the pressure increase of the battery cell.

[0059] Different battery cells may have different parameters. In the above preferred embodiment, the pressure increase threshold of the battery cell is set according to the parameters of the battery cell, taking into account the situation that the parameters of different battery cells may not be the same. Therefore, a reasonable pressure increase threshold can be set for the battery cell.

[0060] As one of the preferred embodiments, the method for protecting a battery cell may further include the following steps:

[0061] When the pressure increase value of the battery cell exceeds the pressure increase threshold, the electrical connection between all the battery cells in the new energy battery pack is disconnected.

[0062] In the above preferred embodiment, when the pressure increase value of one cell in the new energy battery pack exceeds the preset pressure increase threshold, the electrical connection between all cells in the new energy battery pack is disconnected, further protecting the cell from explosion when the pressure increase is too large.

[0063] As one of the preferred embodiments, the method for protecting a battery cell may further include the following steps:

[0064] Based on the analysis results obtained from analyzing the pressure increase data of the battery cell, the parameters of the battery cell are adjusted.

[0065] In the above preferred embodiment, the battery cell parameters are appropriately adjusted to make the battery cell better adaptable to the current working environment, thereby further protecting the battery cell from explosion.

[0066] As one preferred embodiment, in the step of adjusting the parameters of the battery cell based on the analysis results obtained from analyzing the pressure increase value data of the battery cell, the parameter adjustment method of the battery cell includes the following expression:

[0067] ,

[0068] In the formula, Indicates the adjusted number Individual cell parameters Indicates the number before adjustment Individual cell parameters This indicates the initial pressure value of the battery cell. This indicates the pressure value after the cell pressure increases. Indicates the time it takes for the cell pressure to increase. .

[0069] Through the above preferred embodiments, the parameters of the battery cell can be appropriately adjusted.

[0070] like Figure 2 The diagram shown is a structural block diagram of the protection system for the battery cell in this embodiment. Specifically, the protection system for the battery cell in this embodiment may include:

[0071] The pressure increase threshold setting module is used to set the pressure increase value threshold of the battery cell according to the parameters of the battery cell.

[0072] A real-time monitoring module is used to monitor the pressure of the battery cell in real time through a battery cell pressure protection device;

[0073] The fuse module is used to disconnect the electrical connection between the battery cell and its load when the detected pressure increase value of the battery cell exceeds the pressure increase threshold, thereby stopping the battery cell from inputting and outputting current.

[0074] As one of the preferred embodiments, the battery cell protection system may further include:

[0075] The cell parameter adjustment module is used to adjust the parameters of the cell based on the analysis results obtained from analyzing the pressure increase value data of the cell.

[0076] As one of the preferred embodiments, the cell pressure protection device may specifically include:

[0077] The system includes a fuse circuit, a conversion circuit, and a main control circuit. The fuse circuit and the conversion circuit are both connected to the main control circuit. The fuse circuit is used to break the electrical connection between the battery cell and its load when the detected pressure increase value of the battery cell exceeds the pressure increase threshold. The conversion circuit is used to convert the detected battery cell pressure into an electrical signal. The main control circuit is used to control the fuse circuit and the conversion circuit.

[0078] As one of the preferred embodiments, the battery cell protection system may further include:

[0079] An electrical connection disconnection module is used to disconnect the electrical connection between all cells in a new energy battery pack composed of cells when the pressure increase value of the cell is detected to exceed the pressure increase threshold.

[0080] For example, the specific circuit of the cell pressure protection device in this embodiment can be as follows: Figure 3As shown, the cell pressure protection device includes a fuse circuit, a conversion circuit, and a main control circuit. The main control circuit includes a first resistor R1, a first capacitor C1, a second capacitor C2, and an IC chip. One end of the first resistor R1 is connected to one end of the load Z (EB+), and the other end of the first resistor R1 is connected to pin 1 of the IC chip. One end of the first capacitor C1 is connected to pin 2 of the IC chip, and the other end of the first capacitor C1 is connected to the VCC pin of the IC chip. One end of the second capacitor C2 is connected to the VCC pin of the IC chip, and the other end of the second capacitor C2 is connected to the GND pin of the IC chip. The fuse circuit includes an electronic fuse FU and a second resistor R2, which is a variable resistor. One end of the electronic fuse FU is connected to one end of the first resistor R1 in the main control circuit, and the other end of the electronic fuse FU is connected to one end of the second resistor R2. The other end of the second resistor R2 is connected to the output pin c of the operational amplifier U in the conversion circuit. The conversion circuit... The circuit includes an operational amplifier U, a third resistor R3, a fourth resistor R4, a pressure sensor SUP, a fifth resistor R5, a battery cell GB, a sixth resistor R6, and a seventh resistor R7. Pin c of the operational amplifier U is connected to the fuse circuit. Pin a of the operational amplifier U is connected to one end of the fifth resistor R5. The other end of the fifth resistor R5 is connected to the positive terminal of the battery cell GB. The negative terminal of the battery cell GB is connected to the other end EB- of the load Z. The other end of the fifth resistor R5 is also connected to one end of the seventh resistor R7. The other end of the seventh resistor R7 is connected to the other end of the sixth resistor R6. One end of the third resistor R3 is connected to pin c of the operational amplifier U. The other ends of the third resistor R3 and one end of the fourth resistor R4 are both connected to pin b of the operational amplifier U. The other end of the fourth resistor R4 is connected to one end of the pressure sensor SUP. The other end of the pressure sensor SUP is connected to one end of the sixth resistor R6. The other end of the sixth resistor R6 is connected to the VCC pin of the IC chip in the main control circuit. Setting the second resistor R2 in the fuse circuit as a variable resistor ensures that the fuse circuit will only blow when the pressure increase value of the battery cell exceeds the set pressure increase threshold. This ensures that the battery cell will not stop inputting and outputting current to the load when the pressure increase value does not exceed the set pressure increase threshold, thus not affecting the normal operation of the battery cell. Furthermore, by adjusting the resistance value of the variable resistor R2, the battery cell can input and output a preset specific voltage to the load. When the main control circuit detects that the pressure increase value of the battery cell exceeds the set pressure increase threshold through the conversion circuit, the main control circuit controls the fuse in the fuse circuit to blow the electrical connection between the battery cell and the load, causing the battery cell to stop inputting and outputting current to the load in a timely manner, thereby protecting the battery cell from explosion.

[0081] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0082] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A protection system for a battery cell, characterized in that, The cell protection system includes a cell pressure protection device, which comprises: The circuit includes a fuse circuit, a switching circuit, and a main control circuit, wherein the fuse circuit and the switching circuit are both connected to the main control circuit.

2. The cell protection system according to claim 1, characterized in that, The main control circuit includes: A first resistor (R1), a first capacitor (C1), a second capacitor (C2), and an IC chip are connected. One end of the first resistor (R1) is connected to one end (EB+) of the load (Z), and the other end of the first resistor (R1) is connected to the (1) pin of the IC chip. One end of the first capacitor (C1) is connected to the (2) pin of the IC chip, and the other end of the first capacitor (C1) is connected to the (VCC) pin of the IC chip. One end of the second capacitor (C2) is connected to the (VCC) pin of the IC chip, and the other end of the second capacitor (C2) is connected to the (GND) pin of the IC chip.

3. The cell protection system according to claim 1, characterized in that, The fuse circuit includes: An electronic fuse (FU) and a second resistor (R2), the second resistor (R2) being a variable resistor, one end of the electronic fuse (FU) being connected to one end of the first resistor (R1) in the main control circuit, the other end of the electronic fuse (FU) being connected to one end of the second resistor (R2), and the other end of the second resistor (R2) being connected to the output pin of the operational amplifier (U) in the conversion circuit.

4. The cell protection system according to claim 1, characterized in that, The conversion circuit includes: The circuit includes an operational amplifier (U), a third resistor (R3), a fourth resistor (R4), a pressure sensor (SUP), a fifth resistor (R5), a battery cell (GB), a sixth resistor (R6), and a seventh resistor (R7). Pin (c) of the operational amplifier (U) is connected to the fuse circuit. Pin (a) of the operational amplifier (U) is connected to one end of the fifth resistor (R5). The other end of the fifth resistor (R5) is connected to the positive terminal of the battery cell (GB). The negative terminal of the battery cell (GB) is connected to the other end (EB-) of the load (Z). The other end of the fifth resistor (R5) is also connected to the seventh resistor (R7). One end of the seventh resistor (R7) is connected to the other end of the sixth resistor (R6). One end of the third resistor (R3) is connected to pin (c) of the operational amplifier (U). The other ends of the third resistor (R3) and the fourth resistor (R4) are both connected to pin (b) of the operational amplifier (U). The other end of the fourth resistor (R4) is connected to one end of the pressure sensor (SUP). The other end of the pressure sensor (SUP) is connected to one end of the sixth resistor (R6). The other end of the sixth resistor (R6) is connected to the (VCC) pin of the IC chip in the main control circuit.

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