Battery cell monitoring device and electronic equipment

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell monitoring device and electronic equipment, the battery cell monitoring device comprises a battery, a second detection resistor and a switch module which are arranged in a series loop; the detection module is provided with a first detection end and a second detection end, the first detection end is connected with each battery cell to form a first detection loop and obtain a first current, and the second detection end is connected with the second resistor to form a second detection loop and obtain a second current; the detection module is in communication connection with the switch module; when the detection module detects that the first current is not smaller than the second current, the switch module disconnects the loop. When the first current is detected to be not smaller than the second current, it is indicated that battery connection is abnormal, short circuit occurs in the battery, the switch module is controlled to disconnect the loop, output of the battery cell monitoring device is turned off, the battery cell monitoring device is protected, and safety accidents of the battery cell can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery monitoring device and electronic equipment. Background Art

[0002] Since batteries need to be transported when they are shipped after being produced by battery manufacturers, they are prone to being bumped during transportation, causing the battery tabs to break. If the tabs are broken and this is not discovered, when the battery is directly assembled into a device or used directly, the tabs may come into contact with other metal parts, causing the battery to short-circuit and catch fire, resulting in a safety accident.

[0003] At present, the existing technology does not monitor the state of the battery cell, so there is a risk of safety accidents caused by the breakage of the battery cell tab. Utility Model Content

[0004] In view of this, the utility model provides a battery cell monitoring device and an electronic device to solve the problem that the battery cell status is not monitored in the prior art.

[0005] In a first aspect, the utility model provides a battery cell monitoring device, the battery cell monitoring device comprising:

[0006] A battery, comprising at least two cells connected in parallel with each other; in each parallel branch, the cell is connected in series with a first resistor;

[0007] a second resistor, forming a series circuit with the battery;

[0008] A switch module is arranged in the series loop;

[0009] A detection module is provided with a first detection end and a second detection end, wherein the first detection end is connected with each first resistor to form a first detection loop and obtain a first current, and the number of the first detection ends is equal to the number of the first resistors; the second detection end is connected with the second resistor to form a second detection loop and obtain a second current; the detection module is connected with the switch module;

[0010] When the detection module detects that the first current is not less than the second current, the switch module disconnects the loop.

[0011] Beneficial effect: The embodiment of the utility model sets a detection module. When it is detected that the first current is not less than the second current, it indicates that the battery connection is abnormal, causing a short circuit inside the battery. Therefore, it is necessary to control the switch module to disconnect the loop, thereby shutting off the output of the entire battery cell monitoring device to protect the battery cell monitoring device. At this time, technicians are required to inspect and maintain the abnormal battery cell, so as to avoid safety accidents of the battery cell.

[0012] In an optional implementation, the switch module includes:

[0013] A protection chip is provided with an enable terminal and a signal output terminal; the enable terminal is connected to the detection module;

[0014] A switch circuit is provided with a control end and a first end and a second end connected to the series loop; the control end is connected to the signal output end;

[0015] When the detection module detects that the first current is not less than the second current, the first end and the second end are disconnected.

[0016] In an optional implementation, the protection chip is an undervoltage protection chip.

[0017] In an optional embodiment, the switch circuit is composed of two MOS tubes connected in series back to back, the second end of the first MOS tube is connected to the first end of the second MOS tube, the first end of the first MOS tube forms the first end of the switch circuit, the second end of the second MOS tube forms the second end of the switch circuit, and the control end of the first MOS tube and the control end of the second MOS tube jointly form the control end of the switch circuit.

[0018] In an optional implementation, the detection module includes:

[0019] A detection chip is provided with a first port, a second port, a third port and a fourth port, wherein the first port and the second port constitute the first detection end, and the third port and the fourth port constitute the second detection end;

[0020] The first port is connected to one end of the first resistor, and the second port is connected to the other end of the first resistor; the third port is connected to one end of the second resistor, and the fourth port is connected to the other end of the second resistor.

[0021] In an optional implementation, the detection chip is provided with a control port, and the control port is connected to the enable terminal of the protection chip.

[0022] In an optional implementation, when the control port outputs a low level signal, the first end and the second end of the switch circuit are disconnected; when the control port outputs a high level signal, the first end and the second end of the switch circuit are connected.

[0023] Beneficial effect: After the embodiment of the utility model outputs a low-level signal through the control port, the protection chip has no power input, so the first end and the second end of the switch circuit are directly disconnected. Therefore, the protection chip can only be reactivated when the user uses it or the technicians use a charger or an external power supply to connect to the protection chip during maintenance, thereby ensuring the stability of the disconnection circuit when the battery cell is abnormal. In addition, safety accidents of the battery cell can be avoided.

[0024] In an optional embodiment, the battery cell monitoring device further includes:

[0025] The overvoltage protection module is arranged in the series circuit.

[0026] In an optional implementation, a positive output terminal and a negative output terminal are provided in the series circuit.

[0027] In a second aspect, the utility model further provides an electronic device, which includes: a battery cell monitoring device as described in any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 The present invention is an overall circuit diagram of a battery cell monitoring device according to an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1. Battery; 11. Parallel branch;

[0032] 2. Switch module; 21. Protection chip; 211. Enable terminal; 22. Switch circuit;

[0033] 3. Detection module; 31. Detection chip; 311. First port; 312. Second port; 313. Third port; 314. Fourth port; 315. Control port;

[0034] 4. Overvoltage protection module; 5. Positive output terminal; 6. Negative output terminal;

[0035] BAT, battery cell; R1, first resistor; R2, second resistor. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0037] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components, it can be a wireless connection, or it can be a wired connection. For ordinary workers in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] Since batteries need to be transported when they are shipped with power after being produced by battery manufacturers, it is easy for the batteries to be bumped during transportation, causing the battery tabs to break. After the battery tabs break, if this is not discovered, when the batteries are directly assembled into the equipment, or when the batteries are directly used, the battery tabs may come into contact with other metal parts, causing the batteries to short-circuit and catch fire, resulting in safety accidents. At present, the prior art does not monitor the status of the battery cells, so there is a safety accident caused by the broken battery tabs.

[0041] In view of this, the utility model provides a battery cell monitoring device and an electronic device to solve the problem that the prior art fails to monitor the BAT status of the battery cell.

[0042] Combine the following Figure 1 , describing an embodiment of the utility model.

[0043] According to an embodiment of the present utility model, on one hand, a battery cell monitoring device is provided. The battery cell monitoring device includes: a battery 1 , a second resistor R2 , a switch module 2 , and a detection module 3 .

[0044] Specifically, in the embodiment of the utility model, the battery 1 is composed of at least two battery cells BAT connected in parallel, and in each parallel branch 11, the battery cell BAT is connected in series with a first resistor R1. That is, the battery cell BAT and the first resistor R1 are first connected in series to form a parallel branch 11, and a plurality of parallel branches 11 are connected in parallel to form a battery cell BAT as a whole. The second resistor R2 and the battery 1 form a series circuit.

[0045] When the battery 1 is normal, the current flowing through each first resistor R1 is the same as the current flowing through the battery cell BAT. Since the second resistor R2 is on the main line of the entire series circuit, the current flowing through the second resistor R2 is greater than or equal to the current flowing through the first resistor R1, and the specific magnitude relationship is related to the number of parallel branches 11. When the battery 1 is abnormal, the battery cell BAT may be short-circuited, so the current flowing through the second resistor R2 may be less than the current flowing through the first resistor R1. Therefore, in the actual detection process, it is sufficient to directly determine the magnitude relationship between the current flowing through the second resistor R2 and the current flowing through the first resistor R1.

[0046] Further, in an embodiment of the utility model, the switch module 2 is arranged in the series circuit, and is used to open and close the series circuit. The detection module 3 is provided with a first detection terminal and a second detection terminal, the first detection terminal is connected with each first resistor R1 to form a first detection circuit, and obtains a first current, and the number of the first detection terminals is equal to the number of the first resistors R1. When there are multiple first resistors R1, multiple first detection terminals are also correspondingly arranged, so that multiple first detection circuits are formed. The second detection terminal is connected with the second resistor R2 to form a second detection circuit, and obtains a second current, and the detection module 3 is connected with the switch module 2.

[0047] Specifically, during the detection process, the detection module 3 needs to obtain the voltage value of the first resistor R1 and the voltage value of the second resistor R2 through the first detection end and the second detection end, respectively, and then obtain the current flowing through the first resistor R1 and the current flowing through the second resistor R2 respectively through the voltage values. When the detection module 3 detects that the first current is not less than the second current, the detection module 3 sends a control signal to the switch module 2, so that the switch module 2 disconnects the loop.

[0048] In this way, the embodiment of the utility model sets the detection module 3. When it is detected that the first current is not less than the second current, it indicates that the connection of the battery 1 is abnormal, causing a short circuit inside the battery 1. Therefore, it is necessary to control the switch module 2 to disconnect the loop, thereby shutting off the output of the entire battery cell monitoring device to protect the battery cell monitoring device. At this time, technicians are required to inspect and maintain the abnormal battery cell BAT, so as to avoid safety accidents of the battery cell BAT.

[0049] Further, in an optional embodiment, the switch module 2 includes: a protection chip 21 and a switch circuit 22. Specifically, in this embodiment, the protection chip 21 is provided with an enable terminal 211 and a signal output terminal, and the enable terminal 211 is connected to the detection module 3. When the signal output by the detection module 3 is a high-level signal, the high-level signal can be supplied to the protection chip 21 after being input into the protection chip 21 through the enable terminal 211. When the signal output by the detection module 3 is a low-level signal, the protection chip 21 cannot operate at this time because the low-level signal cannot drive the protection chip 21 to start normally.

[0050] Furthermore, the switch circuit 22 is provided with a control end and a first end and a second end connected to the series loop, and the control end is connected to the signal output end. When the detection module 3 detects that the first current is not less than the second current, the detection module 3 outputs a low-level signal, and at this time the protection chip 21 cannot operate, thereby failing to drive the switch circuit 22, and therefore the first end and the second end of the switch circuit 22 are disconnected.

[0051] Further, in an optional implementation, the protection chip 21 is an undervoltage protection chip 21. Of course, this embodiment is only an example of the specific type of the protection chip 21, but it is not limited thereto, and those skilled in the art can make changes according to actual conditions as long as the same technical effect can be achieved.

[0052] Further, in an optional implementation, the switch circuit 22 is composed of two MOS transistors connected in series back to back. That is, the second end of the first MOS transistor is connected to the first end of the second MOS transistor, the first end of the first MOS transistor forms the first end of the switch circuit 22, the second end of the second MOS transistor forms the second end of the switch circuit 22, and the control end of the first MOS transistor and the control end of the second MOS transistor together form the control end of the switch circuit 22.

[0053] Further, in an optional embodiment, the detection module 3 includes a detection chip 31, and the detection chip 31 is provided with a first port 311, a second port 312, a third port 313 and a fourth port 314. The first port 311 and the second port 312 constitute the first detection end, and the third port 313 and the fourth port 314 constitute the second detection end. The first port 311 is connected to one end of the first resistor R1, and the second port 312 is connected to the other end of the first resistor R1, so as to form a detection loop for detecting the first resistor R1. The third port 313 is connected to one end of the second resistor R2, and the fourth port 314 is connected to the other end of the second resistor R2, so as to form a detection loop for detecting the second resistor R2.

[0054] Further, in an optional implementation, the detection chip 31 is provided with a control port 315, and the control port 315 is connected to the enable terminal 211 of the protection chip 21. Specifically, when the control port 315 outputs a low-level signal, the first end and the second end of the switch circuit 22 are disconnected. When the control port 315 outputs a high-level signal, the first end and the second end of the switch circuit 22 are connected.

[0055] With such a configuration, after the embodiment of the utility model outputs a low-level signal through the control port 315, the protection chip 21 has no power input, so the first end and the second end of the switch circuit 22 are directly disconnected. Therefore, the protection chip 21 can only be reactivated when the user uses it or the technicians perform maintenance by connecting the protection chip 21 with a charger or an external power supply, thereby ensuring the stability of the disconnection circuit when the battery cell BAT is abnormal. This can avoid safety accidents of the battery cell BAT.

[0056] Furthermore, in an optional implementation, the battery cell monitoring device further includes an overvoltage protection module 4, and the overvoltage protection module 4 is disposed in the series circuit.

[0057] Furthermore, in an optional embodiment, a positive output terminal 5 and a negative output terminal 6 are provided in the series circuit. When using the battery monitoring device, the positive and negative electrodes of the device are normally connected to the positive output terminal 5 and the negative output terminal 6 respectively, and the battery monitoring device can be discharged normally. When charging the battery monitoring device, the positive and negative electrodes of the device are respectively connected to the positive and negative electrodes of the mains.

[0058] In a second aspect, the utility model further provides an electronic device, which includes: a battery cell monitoring device as described in any of the above embodiments.

[0059] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery cell monitoring device, It is characterized in that include: A battery (1) having at least two battery cells (BAT) connected in parallel with each other; in each parallel branch (11), the battery cell (BAT) is connected in series with a first resistor (R1); A second resistor (R2) forming a series circuit with the battery (1); A switch module (2), arranged in the series circuit; A detection module (3) is provided with a first detection end and a second detection end, wherein the first detection end is connected to each first resistor (R1) to form a first detection loop and obtain a first current, and the number of the first detection ends is equal to the number of the first resistors (R1); the second detection end is connected to the second resistor (R2) to form a second detection loop and obtain a second current; the detection module (3) is connected to the switch module (2); When the detection module (3) detects that the first current is not less than the second current, the switch module (2) disconnects the circuit.

2. The battery cell monitoring device according to claim 1, It is characterized in that The switch module (2) comprises: A protection chip (21) is provided with an enabling terminal (211) and a signal output terminal; the enabling terminal (211) is connected to the detection module (3); A switch circuit (22) is provided with a control end and a first end and a second end connected to the series loop; the control end is connected to the signal output end; When the detection module (3) detects that the first current is not less than the second current, the first end and the second end are disconnected.

3. The battery cell monitoring device according to claim 2, It is characterized in that The protection chip (21) is an undervoltage protection chip (21).

4. The battery cell monitoring device according to claim 3, It is characterized in that The switch circuit (22) is composed of two MOS tubes connected in series back to back, the second end of the first MOS tube is connected to the first end of the second MOS tube, the first end of the first MOS tube forms the first end of the switch circuit (22), the second end of the second MOS tube forms the second end of the switch circuit (22), and the control end of the first MOS tube and the control end of the second MOS tube together form the control end of the switch circuit (22).

5. The battery cell monitoring device according to any one of claims 2 to 4, It is characterized in that The detection module (3) comprises: A detection chip (31) is provided with a first port (311), a second port (312), a third port (313) and a fourth port (314), wherein the first port (311) and the second port (312) constitute the first detection end, and the third port (313) and the fourth port (314) constitute the second detection end; The first port (311) is connected to one end of the first resistor (R1), and the second port (312) is connected to the other end of the first resistor (R1); the third port (313) is connected to one end of the second resistor (R2), and the fourth port (314) is connected to the other end of the second resistor (R2).

6. The battery cell monitoring device according to claim 5, It is characterized in that The detection chip (31) is provided with a control port (315), and the control port (315) is connected to the enable terminal (211) of the protection chip (21).

7. The battery cell monitoring device according to claim 6, It is characterized in that When the control port (315) outputs a low-level signal, the first end and the second end of the switch circuit (22) are disconnected; when the control port (315) outputs a high-level signal, the first end and the second end of the switch circuit (22) are connected.

8. The battery cell monitoring device according to any one of claims 1 to 4, It is characterized in that Also includes: An overvoltage protection module (4) is arranged in the series circuit.

9. The battery cell monitoring device according to any one of claims 1 to 4, It is characterized in that The series circuit is provided with a positive output terminal (5) and a negative output terminal (6).

10. An electronic device, It is characterized in that include: The battery cell monitoring device according to any one of claims 1 to 9.

Images