Battery pack liquid leakage detection circuit

Abstract

The utility model provides a battery pack liquid leakage detection circuit, the battery pack liquid leakage detection circuit comprises a power supply, a plurality of FCC wire harnesses and a liquid leakage signal capturing module, the plurality of FCC wire harnesses are in one-to-one correspondence with a plurality of single battery cells in a battery pack, each FCC wire harness is arranged in a liquid leakage detection area on the surface of the corresponding single battery cell, and for each FCC wire harness, the liquid leakage signal capturing module is connected with the FCC wire harness. One end of the FCC wire harness is connected to the power supply, the other end of the FCC wire harness is connected to the liquid leakage signal capturing module, the liquid leakage detection circuit structure is simplified through the FCC wire harness, the detection cost is reduced, and meanwhile the occupied space is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of battery pack leakage detection, and in particular to a battery pack leakage detection circuit. Background Art

[0002] In the prior art leakage detection scheme for battery packs, conventional sensors are used, which can effectively detect only when the electrolyte leaks onto the battery box shell, but cannot detect trace leakage of single cells. If each single cell is tested one by one, the detection system will be complicated, costly and space-consuming. Utility Model Content

[0003] In view of this, the purpose of the present application is to at least provide a battery pack leakage detection circuit, which simplifies the circuit structure of leakage detection through the FCC wiring harness, reduces the detection cost and reduces the occupied space.

[0004] This application mainly includes the following aspects:

[0005] In a first aspect, an embodiment of the present application provides a battery pack leakage detection circuit, which includes a power supply, at least one FCC wiring harness and a leakage signal capture module, wherein at least one FCC wiring harness is arranged in a leakage detection area on the surface of a corresponding single cell, wherein for each FCC wiring harness, one end of the FCC wiring harness is connected to the power supply, and the other end of the FCC wiring harness is connected to the leakage signal capture module.

[0006] In one possible implementation, the battery pack leakage detection circuit further includes a reverse protection module, wherein one end of the reverse protection module is connected to a power supply, and the other end of the reverse protection module is respectively connected to one end of each FCC wiring harness.

[0007] In a possible implementation, the reverse protection module includes a current limiting resistor, wherein one end of the current limiting resistor is connected to the power supply, and the other end of the current limiting resistor is respectively connected to one end of each FCC wiring harness.

[0008] In a possible implementation manner, the reverse protection module further includes a reverse protection diode, wherein an anode of the reverse protection diode is connected to the other end of the current limiting resistor, and a cathode of the reverse protection diode is connected to one end of each FCC wiring harness.

[0009] In a possible implementation, the leakage signal capture module includes a controller and a sampling resistor, wherein one end of the sampling resistor is connected to the other end of at least one FCC wiring harness and the controller, and the other end of the sampling resistor is grounded.

[0010] In a possible implementation manner, the sampling resistor includes one, wherein one end of the sampling resistor is respectively connected to the other end of at least one FCC wiring harness and the controller, and the other end of the sampling resistor is grounded.

[0011] In a possible implementation, the sampling resistor includes a plurality of sampling resistors, and the plurality of sampling resistors correspond one-to-one to the plurality of FCC harnesses, wherein one end of the sampling resistor is respectively connected to the other end of the corresponding FCC harness and the controller, and the other end of the sampling resistor is grounded.

[0012] In a possible implementation manner, one end of the sampling resistor is connected to an ADC acquisition pin or an interrupt pin on the controller.

[0013] In one possible implementation, the battery pack leakage detection circuit also includes an adapter module, wherein the cathode of the reverse protection diode in the reverse protection module is respectively connected to one end of each FCC wiring harness through the adapter module, and the other end of each FCC wiring harness is connected to the leakage signal capture module through the adapter module. If the leakage signal capture module includes a sampling resistor, the other end of each FCC wiring harness is connected to one end of the sampling resistor. If the leakage signal capture module includes multiple sampling resistors, the other end of each FCC wiring harness is respectively connected to one end of the corresponding sampling resistor.

[0014] In one possible implementation, the adapter module includes a plurality of adapter sockets corresponding one-to-one to a plurality of FCC harnesses, each adapter socket including a first access terminal and a second access terminal, wherein, for each adapter socket, the first access terminal of the adapter socket is respectively connected to the cathode of the anti-reverse diode and one end of the corresponding FCC harness, and the second access terminal of the adapter socket is respectively connected to the other end of the corresponding FCC harness and a leakage signal capture module, if the leakage signal capture module includes a sampling resistor, the second access end of the adapter socket is connected to one end of the sampling resistor, and if the leakage signal capture module includes multiple sampling resistors, the second access end of the adapter socket is connected to one end of the sampling resistor corresponding to the adapter socket.

[0015] A battery pack leakage detection circuit is provided in an embodiment of the present application. The battery pack leakage detection circuit includes a power supply, at least one FCC wiring harness and a leakage signal capture module. At least one FCC wiring harness is arranged in a leakage detection area on the surface of a corresponding single battery cell. For each FCC wiring harness, one end of the FCC wiring harness is connected to the power supply, and the other end of the FCC wiring harness is connected to the leakage signal capture module. The present application simplifies the circuit structure of leakage detection through the FCC wiring harness, thereby reducing detection costs and occupying space.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 One of the structural schematic diagrams of a battery pack leakage detection circuit provided in an embodiment of the present application is shown;

[0019] Figure 2 A second structural schematic diagram of a battery pack leakage detection circuit provided in an embodiment of the present application is shown;

[0020] Figure 3 A third structural schematic diagram of a battery pack leakage detection circuit provided in an embodiment of the present application is shown;

[0021] Figure 4 A fourth structural schematic diagram of a battery pack leakage detection circuit provided in an embodiment of the present application is shown;

[0022] Figure 5 A fifth structural schematic diagram of a battery pack leakage detection circuit provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0023] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art, under the guidance of the content of the present application, can add one or more other operations to the flowchart, or remove one or more operations from the flowchart.

[0024] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0025] In the leakage detection solution provided by the prior art, if the voltage at the leakage location is high, current will flow back to the power supply through the resistor, causing damage to the power supply.

[0026] Based on this, the embodiment of the present application provides a battery pack leakage detection circuit, which prevents the current backflow of the power supply caused by the excessive voltage at the leakage position to the power supply by adding a reverse protection module between the leakage signal detection module and the power supply, thereby avoiding damage to the power supply, as follows:

[0027] See also Figure 1 , Figure 1 FIG. 1 shows one of the structural schematic diagrams of a battery pack leakage detection circuit provided in an embodiment of the present application. Figure 1 As shown, the battery pack leakage detection circuit provided in the embodiment of the present application includes a power supply VCC, at least one FCC wiring harness 1 and a leakage signal capture module 2, and at least one FCC wiring harness is arranged in the leakage detection area on the surface of the corresponding single battery cell.

[0028] In a preferred embodiment, for each FCC harness 1 , one end of the FCC harness 1 is connected to the power supply VCC, and the other end of the FCC harness 1 is connected to the leakage signal capturing module 2 .

[0029] Specifically, the at least one FCC harness 1 provided in the present application is used to detect leakage of multiple single cells in a battery pack. The multiple single cells in the battery pack are placed side by side. Each FCC harness 1 can be arranged on the side formed by the multiple single cells placed side by side, spanning the multiple single cells. At least one FCC harness 1 is connected in parallel, that is, any FCC harness 1 can capture leakage of the single cell.

[0030] In this application, if Figure 1 The battery pack leakage detection circuit shown in the figure has the following leakage detection process:

[0031] For each FCC harness 1, when leakage occurs in the leakage detection area on the single battery cell corresponding to the FCC harness 1, one end of the FCC harness 1 (the black line input end) and the other end of the FCC harness 1 (the blue line output end) will be short-circuited, thereby making the loop between the power supply and the leakage signal capture module 2 conductive, thereby generating a leakage signal. The leakage signal capture module 2 will further capture the leakage signal and further complete the leakage monitoring of the electromagnetic package.

[0032] The advantage of using the FCC harness for battery pack leakage detection is that the FCC harness is soft and low-cost, and can be flexibly arranged in multiple leakage detection areas in the battery pack. In this way, by arranging the FCC harness in the leakage detection area in the battery pack, not only can the leakage of each single cell in the battery pack be monitored, but the detection cost can also be greatly reduced. Another advantage of using the FCC harness in the present application is that FCC harnesses of different sizes (including length and width) can be selected according to the area of ​​the leakage detection area. In other words, the applicability of the battery pack leakage detection circuit provided in the present application is further increased, so that it can be applied to battery packs of different specifications. In other words, the present application simplifies the circuit structure of leakage detection, reduces detection costs and reduces occupied space.

[0033] See also Figure 2 , Figure 2 FIG2 shows a second structural schematic diagram of a battery pack leakage detection circuit provided in an embodiment of the present application. Figure 2 As shown, the battery pack leakage detection circuit provided in the present application also includes a reverse protection module 3, wherein one end of the reverse protection module 3 is connected to the power supply VCC, and the other end of the reverse protection module 3 is respectively connected to one end of each FCC wiring harness.

[0034] In the present application, the protection module is used to implement reverse connection protection for the power supply VCC. Specifically, when leakage occurs in the leakage detection area and causes the FCC harness to short-circuit, the loop between the power supply VCC and the leakage signal capture module 2 is connected, and the generated conduction current may cause current backflow, thereby impacting the power supply VCC and causing damage to the power supply VCC, thereby causing a safety hazard. Therefore, the present application can eliminate the current backflow phenomenon caused by battery pack leakage by adding a reverse protection module 3 between the power supply VCC and multiple FCC harnesses, thereby further protecting the power supply VCC.

[0035] See also Figure 3 , Figure 3 FIG3 shows a third structural schematic diagram of a battery pack leakage detection circuit provided in an embodiment of the present application. Figure 3As shown, the battery pack leakage detection circuit provided in the present application also includes a switching module 4.

[0036] Preferably, the power supply VCC is connected to one end of the reverse protection module 3, the other end of the reverse protection module 3 is connected to one end of multiple FCC harnesses 1 through the adapter module 4, and the other end of each FCC harness 1 is connected to the leakage signal capture module 2 through the adapter module 4.

[0037] In the present application, the adapter module 4 can be a socket with a signal adapter function. The function of the adapter module 4 is to transmit the leakage signal generated by the short circuit to the leakage signal capture module 2 when a short circuit occurs in the FCC wiring harness, so that the leakage signal is captured by the leakage signal capture module 2.

[0038] See also Figure 4 , Figure 4 FIG4 shows a fourth structural diagram of a battery pack leakage detection circuit provided in an embodiment of the present application. Figure 4 As shown, the reverse protection module 3 includes a current limiting resistor R1 and an anti-reverse diode D1, the adapter module 4 includes multiple adapter sockets 41, the leakage signal capture module 2 includes a sampling resistor Rs and a controller MCU, and the battery pack leakage detection circuit also includes an alarm 5, wherein the adapter socket 41 is connected one-to-one with the FCC wiring harness 1.

[0039] Preferably, the power supply VCC is connected to one end of the current limiting resistor R1, the other end of the current limiting resistor R1 is connected to the anode of the anti-reverse polarity diode D1, the cathode of the anti-reverse polarity diode D1 is respectively connected to the first access end of each adapter socket 41, the first access end of each adapter socket 41 is also connected to one end of the corresponding FCC wiring harness 1, the other end of each FCC wiring harness 1 is also connected to one end of the sampling resistor Rs through the second access end of the corresponding adapter socket 41, one end of the sampling resistor Rs is also connected to the controller MCU, the controller MCU is also connected to the alarm 5, and the other end of the sampling resistor Rs is grounded.

[0040] In a specific embodiment, the power supply VCC can be 3.3V.

[0041] In this application, when any FCC wiring harness in the leakage detection area of ​​the battery pack is corroded and short-circuited (the black line and the blue line in the figure are turned on due to electrolyte corrosion), the sampling resistor Rs will have a voltage conducted by the power supply VCC through the current limiting resistor R1 and the anti-reverse diode D1. The controller MCU detects the abnormal voltage on the sampling resistor Rs through the ADC acquisition pin, and determines whether there is a leakage through the software strategy, and then reports the leakage fault, and performs shutdown processing, and can also complete the alarm through the alarm.

[0042] In addition, the present application adds an anti-reverse diode D1 and a current-limiting resistor R1 to protect the power supply VCC. Specifically, in the event of leakage in the leakage detection area in the battery pack, the voltage generated by the leakage will not cause current backflow to the power supply VCC through the protection of the anti-reverse diode D1, thereby providing reverse protection for the power supply VCC.

[0043] In addition, when leakage occurs in the leakage detection area, a leakage voltage is generated. When the leakage voltage is lower than the power supply VCC, the current limiting resistor R1 can play a current limiting protection role to prevent the power supply VCC from being pulled down by the leakage voltage.

[0044] In the present application, FCC harnesses of different lengths and widths can be selected according to the area of ​​the leakage detection region. Since the FCC harnesses have the advantages of being soft and low-cost, they can be flexibly laid out.

[0045] See also Figure 5 , Figure 5 FIG5 shows a fifth structural diagram of a battery pack leakage detection circuit provided in an embodiment of the present application. Figure 5 As shown, the leakage signal capture module includes at least one sampling resistor Rs corresponding to at least one FCC wiring harness.

[0046] In such Figure 5 In the illustrated embodiment, for each adapter socket 41, a first input end of the adapter socket 41 is connected to the cathode of the anti-reverse diode D1, and a second input end of the adapter socket 41 is respectively connected to the other end of a corresponding group of FCC wiring harnesses 1 and one end of a sampling resistor Rs, and each sampling resistor Rs, one end of the sampling resistor Rs is also connected to different pins corresponding to the controller.

[0047] Specifically, in Figure 5 In the provided battery pack leakage detection circuit, each connection between the sampling resistor Rs and the controller corresponds to a leakage detection channel. The mapping relationship between the leakage detection channel, FCC wiring harness, and leakage detection area is preset in the controller MCU. When the controller detects a leakage signal in a leakage detection channel, it determines the leakage detection area where the leakage occurs based on the mapping relationship between the leakage detection channel, FCC wiring harness and the leakage detection area, and sends a corresponding leakage alarm through the alarm.

[0048] In this embodiment, by setting a one-to-one corresponding sampling resistor and FCC harness, the controller MCU can clearly know which leakage detection area has leaked, so that the final detection result is more accurate and it is easier to guide the user to make more reasonable responses later.

[0049] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. In the several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0050] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0051] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0052] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0053] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A battery pack leakage detection circuit, characterized in that: The battery pack leakage detection circuit includes a power supply, at least one FCC wiring harness and a leakage signal capture module, wherein the at least one FCC wiring harness is arranged in a leakage detection area on the surface of a corresponding single cell. Among them, for each FCC wiring harness, one end of the FCC wiring harness is connected to the power supply, and the other end of the FCC wiring harness is connected to the leakage signal capture module.

2. The battery pack leakage detection circuit according to claim 1, characterized in that: The battery pack leakage detection circuit also includes a reverse protection module. One end of the reverse protection module is connected to the power supply, and the other end of the reverse protection module is respectively connected to one end of each FCC wiring harness.

3. The battery pack leakage detection circuit according to claim 2, characterized in that: The reverse protection module includes a current limiting resistor, One end of the current limiting resistor is connected to the power supply, and the other end of the current limiting resistor is respectively connected to one end of each FCC wiring harness.

4. The battery pack leakage detection circuit according to claim 3, characterized in that: The reverse protection module also includes a reverse protection diode. The anode of the anti-reverse diode is connected to the other end of the current limiting resistor, and the cathode of the anti-reverse diode is connected to one end of each FCC wiring harness.

5. The battery pack leakage detection circuit according to claim 1, characterized in that: The leakage signal capture module includes a controller and a sampling resistor. One end of the sampling resistor is connected to the other end of at least one FCC wiring harness and the controller, and the other end of the sampling resistor is grounded.

6. The battery pack leakage detection circuit according to claim 5, characterized in that: The sampling resistor includes a One end of the sampling resistor is respectively connected to the other end of at least one FCC wiring harness and the controller, and the other end of the sampling resistor is grounded.

7. The battery pack leakage detection circuit according to claim 5, characterized in that: The sampling resistors include a plurality of sampling resistors, and the plurality of sampling resistors correspond one to one with the plurality of FCC wiring harnesses. One end of the sampling resistor is connected to the other end of the corresponding FCC wiring harness and the controller respectively, and the other end of the sampling resistor is grounded.

8. The battery pack leakage detection circuit according to claim 5, characterized in that: One end of the sampling resistor is connected to an ADC acquisition pin or an interrupt pin on the controller.

9. The battery pack leakage detection circuit according to claim 2, characterized in that: The battery pack leakage detection circuit also includes a switching module. The cathode of the anti-reverse diode in the reverse protection module is connected to one end of each FCC harness through the adapter module, and the other end of each FCC harness is connected to the leakage signal capture module through the adapter module. If the leakage signal capture module includes a sampling resistor, the other end of each FCC harness is connected to one end of the sampling resistor; if the leakage signal capture module includes multiple sampling resistors, the other end of each FCC harness is respectively connected to one end of the corresponding sampling resistor.

10. The battery pack leakage detection circuit according to claim 9, characterized in that: The adapter module includes a plurality of adapter sockets corresponding to a plurality of FCC wiring harnesses one by one, each adapter socket including a first access terminal and a second access terminal. Wherein, for each adapter socket, the first access terminal of the adapter socket is respectively connected to the cathode of the anti-reverse diode and one end of the corresponding FCC wiring harness, and the second access terminal of the adapter socket is respectively connected to the other end of the corresponding FCC wiring harness and the leakage signal capture module; If the leakage signal capture module includes a sampling resistor, the second access end of the adapter socket is connected to one end of the sampling resistor; if the leakage signal capture module includes multiple sampling resistors, the second access end of the adapter socket is connected to one end of the sampling resistor corresponding to the adapter socket.

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