CN115684967A - Battery connector short circuit detection method and device, electronic equipment and storage medium - Google Patents

Abstract

The present application discloses a battery connector short-circuit detection method, device, electronic equipment, and storage medium. The method includes: separately obtaining the first voltage of the battery, the second voltage of the battery cell, and the charging current of the battery; according to the first voltage, The second voltage and the charging current determine the impedance of the battery protection board; compare the impedance with a preset value to obtain a comparison result; and determine whether there is a short circuit in the battery connector according to the comparison result. This solution can judge whether there is a short circuit in the battery connector, and ensure the consistency of charging after the electronic device is shipped.

Description

Battery connector short circuit detection method, device, electronic equipment and storage medium

technical field

The present invention generally relates to the field of electronic technology, in particular to a battery connector short-circuit detection method, device, electronic equipment and storage medium.

Background technique

Electronic devices such as lithium-ion batteries used in mobile phones include sequentially connected battery cells, battery protection boards (Protective circuit Module, PCM), and battery connectors (in the embodiment of this application, battery board-to-board (BTB (Board-to-Board) Board) connector shown). As the charging power/charging current of mobile phones increases, the pursuit of the ultimate charging time is to try to use the maximum current allowed by the battery cell to charge to the limited voltage.

For charging safety, the battery Cell voltage is detected to determine the safety of high-current fast charging. Among them, the P+/P- pin of the battery BTB connector detects the battery Pack voltage, and the S+/BS pin of the battery BTB connector detects the Cell voltage. The signal pin distribution of the battery BTB connector has maximized the distance between the positive and negative pins, and the distance between the P+/S+ and P-/BS pins has been opened as much as possible, but there is still a low probability that the production line will cause P+/S+ or P-/BS short circuit.

Contents of the invention

In view of the above defects or deficiencies in the prior art, it is desired to provide a battery connector short circuit detection method, device, electronic equipment and storage medium.

In the first aspect, the present invention provides a short-circuit detection method for a battery connector, which is applied to a battery, and the battery includes a battery cell, a battery protection board, and a battery connector connected in sequence. The method is characterized in that the method includes:

Obtaining the first voltage of the battery, the second voltage of the battery cell and the charging current of the battery respectively;

determining the impedance of the battery protection board according to the first voltage, the second voltage and the charging current;

Compare the impedance with the preset value to get the comparison result;

Based on the comparison, determine if there is a short circuit in the battery connector.

In one of the embodiments, according to the comparison result, determining whether there is a short circuit in the battery connector includes:

If the comparison result is that the impedance is less than the preset value, it is determined that there is a short circuit in the battery connector;

If the comparison result is that the impedance is greater than or equal to the preset value, it is determined that the battery connector is not short-circuited.

In one of the embodiments, if the comparison result is that the impedance is less than the preset value, it is determined that there is a short circuit in the battery connector, including:

If the comparison result shows that the impedance is less than the preset value for a predetermined number of consecutive times, it is determined that there is a short circuit in the battery connector.

In one of the embodiments, the impedance of the battery protection board is determined according to the first voltage, the second voltage, and the charging current, including:

determining a voltage difference between the first voltage and the second voltage;

Determine the quotient of the voltage difference and the charging current as the impedance of the battery protection board.

In one embodiment, the preset value is a preset fixed value.

In one of the embodiments, the battery includes a current-sense resistor and a MOS transistor;

The preset value is determined according to the resistance value of the current-sensing resistor, the DC impedance of the MOS transistor, and the wiring impedance.

In one embodiment, the trace impedance includes a positive trace impedance and a negative trace impedance.

In the second aspect, the present invention provides a battery connector short-circuit detection device, which is applied to a battery, and the battery includes a battery cell, a battery protection board, and a battery connector connected in sequence. The device includes:

An acquisition module, configured to respectively acquire the first voltage of the battery, the second voltage of the battery cell, and the charging current of the battery;

A determining module, configured to determine the impedance of the battery protection board according to the first voltage, the second voltage and the charging current;

The processing module is used to compare the impedance with a preset value to obtain a comparison result; and determine whether there is a short circuit in the battery connector according to the comparison result.

In a third aspect, the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and operable on the processor. When the processor executes the program, the short circuit detection of the battery connector as in the first aspect is realized. method.

In a fourth aspect, the present invention provides a readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the battery connector short-circuit detection method as in the first aspect is implemented.

A battery connector short-circuit detection method, device, electronic equipment, and storage medium provided in the embodiments of the present application. The solution is based on the existing hardware solution and determines the The impedance of the battery protection board, and then by comparing the impedance with the preset value, it can be judged whether the battery connector is short-circuited, which can ensure the consistency of charging of electronic devices such as mobile phones after shipment.

Description of drawings

Other characteristics, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

FIG. 1 is a schematic flow chart of a battery connector short circuit detection method provided by an embodiment of the present invention;

2 is an equivalent circuit diagram of a battery charging and discharging circuit provided by an embodiment of the present invention;

Fig. 3 is a charging/discharging path diagram of Fig. 2;

4 is a schematic structural diagram of a battery connector short-circuit detection device provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention.

Detailed ways

The application will be 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 related inventions, rather than to limit the invention. It should also be noted that, for ease of description, only parts related to the invention are shown in the drawings.

In order to enable those skilled in the art to better understand the solution of the application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the drawings in the embodiment of the application. Obviously, the described embodiment is only It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and not necessarily Used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the described embodiments of the application can be practiced in sequences other than those illustrated or described herein.

Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or modules is not necessarily limited to the expressly listed Instead, other steps or modules not explicitly listed or inherent to the process, method, product or apparatus may be included.

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

In related technologies, for charging safety, the battery Cell voltage is detected to determine the safety of high-current fast charging. Among them, the P+/P- pin of the battery BTB connector detects the battery Pack voltage, and the S+/BS pin of the battery BTB connector detects the battery Cell voltage. The signal pin distribution of the battery BTB connector has maximized the distance between the positive and negative pins, and the distance between the P+/S+ and P-/BS pins has been opened as much as possible, but there is still a low probability that the production line will cause P+/S+ or P-/BS short circuit. If P+/S+ is short-circuited or P-/BS is short-circuited, the battery Cell voltage detection will be inaccurate. When discharging, the battery Cell voltage detection will be low; when charging, the battery Cell voltage detection will be high, and the charging constant current (Contact Current, CC) The phase time will be shortened, the full time will be increased, and the corresponding protection MOS transistor will be bypassed, which will not function as protection.

However, there is currently no detection for a short circuit on the battery BTB connectors P+/S+ or P-/BS.

Based on the above defects, the present application proposes a battery connector short-circuit detection method, which can detect whether a battery BTB connector is short-circuited.

Referring to FIG. 1 , it shows a schematic flowchart of a method for detecting a short circuit of a battery connector applicable to the present application. The battery connector short-circuit detection method can be applied to electronic devices capable of fast charging, such as mobile phones, tablet computers, wearable devices, and the like. The following uses a mobile phone as an example.

As shown in Figure 1, the battery connector short circuit detection method may include:

S110. Obtain the first voltage of the battery, the second voltage of the battery cell, and the charging current of the battery respectively.

Specifically, the mobile phone may include two charging modes: fast charging (referred to as fast charging) and normal charging (referred to as general charging). The fast charging mode is mainly completed based on the integrated charge pump chip, and the general charging is mainly completed by a power management integrated circuit (Power Manganent Integrate Circuit, PMIC). Wherein, an analog-to-digital converter (Analog-to-Digital Converter, ADC) is integrated in the chip integrating the charge pump and the PMIC. The PMIC or fast charge chargepump can detect the battery Pack voltage (that is, the first voltage of the battery) and the Cell voltage (that is, the second voltage of the battery cell) through the ADC.

It can be understood that, besides detecting the first voltage and the second voltage by ADC, other methods may also be used. For example, when detecting the Cell voltage, a fuel gauge chip can also be added to the battery PCM to detect the Cell voltage without connecting the battery Cell to the battery BTB connector.

It can also be understood that a current-sensing resistor is connected between the battery, the PMIC, and the fast-charging chargepump to obtain the charging current of the battery.

S120. Determine the impedance of the battery protection board according to the first voltage, the second voltage and the charging current.

Optionally, determining a voltage difference between the first voltage and the second voltage;

Determine the quotient of the voltage difference and the charging current as the impedance of the battery protection board.

It can be understood that, for example, if the measured first voltage is V _P and the second voltage is V _C , then the voltage difference V _difference is:

V _difference = V _P - V _C .

The measured charging current is I _bat , then the impedance R of the battery protection board is:

R=V _difference /I _bat .

S130. Comparing the impedance with a preset value to obtain a comparison result.

Specifically, the preset value is a critical value for judging whether there is a short circuit in the BTB connector of the battery.

Optionally, the preset value may be a preset fixed value. It can be understood that the preset value can be set according to actual requirements. For example, the fixed value can be determined according to the resistance value in the battery specification, or the fixed value can be preset according to different types of batteries.

The battery also includes a current-sensing resistor and a MOS transistor. Optionally, the preset value is determined according to the resistance of the current-sensing resistor, the DC impedance of the MOS transistor, and the wiring impedance. Optionally, the trace impedance includes a positive trace impedance and a negative trace impedance.

It can be understood that the resistance value of the current detection resistor, the DC resistance of the MOS transistor, the impedance of the positive wiring and the impedance of the negative wiring are all fixed values.

For example, the resistance of the current-sensing resistor is R _sns , the DC resistance of the MOS transistor is R _MOS , the positive wiring impedance is R ₊ , the negative wiring impedance is R _- , and the preset _value R is:

_Rpre =R _sns +R _MOS +R ₊ +R _- .

It can be understood that the comparison result may be that the impedance is smaller than the preset value, that the impedance is equal to the preset value, or that the impedance is greater than the preset value.

S140. Determine whether there is a short circuit in the battery connector according to the comparison result.

If the comparison result is that the impedance is less than the preset value, it is determined that there is a short circuit in the battery connector;

If the comparison result is that the impedance is greater than or equal to the preset value, it is determined that the battery connector is not short-circuited.

In order to eliminate the interference detected by the ADC, if the comparison result shows that the impedance is less than the preset value, it is determined that there is a short circuit in the battery connector, which can include:

If the comparison result shows that the impedance is less than the preset value for a predetermined number of consecutive times, it is determined that there is a short circuit in the battery connector.

Specifically, the preset number of times can be set according to actual needs, for example, 10 times.

The battery connector short-circuit detection method provided in this embodiment is based on the existing hardware solution, and determines the impedance of the battery protection board through the detected first voltage, second voltage, and charging current, and then determines the impedance of the battery protection board through the impedance and the preset value. The comparison result of the comparison can determine whether the battery connector is short-circuited, and can ensure the consistency of charging of electronic devices such as mobile phones after shipment.

The battery connector short circuit detection method of the present application will be described below in conjunction with the equivalent circuit diagram of the battery charging and discharging circuit shown in FIG. 2 and FIG. 3 and its charging/discharging path diagram.

As shown in Figures 2 and 3, when there is no short circuit, the calculated preset value R _is the resistance value of the current-sensing resistor R _sns + the DC resistance of the MOS transistor R _MOS + the positive wiring impedance R ₊ + the negative wiring impedance is R ₋ , that is, R _pre =R _sns +R _MOS +R ₊ +R ₋ .

For example, R _sns = 4mohm, R ₊ = 0.4+4.1 = 4.5mohm, R _- = 4.9+0.64 = 5.54mohm, R _MOS = 5mohm, then _R = 4+4.5+5.54+5 = 19.04mohm, generally, You can set R _preset to 19mohm.

As shown in Figure 2, in theory, if P+/S+ is short-circuited, the positive wiring impedance will be reduced by 4.5mohm, 19.04-4.5=14.54mohm; if P-/BS is short-circuited, the negative wiring impedance +R _sns +R will be reduced _MOS = 15 mohm, 19.04-14.54 = 4.5 mohm.

The impedance R of the battery protection board is calculated by the detected first voltage, second voltage and battery current. If R<R for 10 _consecutive times, it can be determined that there is a short circuit in the battery BTB connector; otherwise, the battery BTB connector is not connected. short circuit. The following table shows the actual project verification results

FIG. 4 is a schematic structural diagram of a battery connector short-circuit detection device 400 provided by an embodiment of the present invention. The device is applied to a battery, and the battery includes a battery cell, a battery protection board, and a battery connector connected in sequence. As shown in Figure 4, the device can implement the method shown in Figure 1, and the device can include:

An acquisition module 410, configured to respectively acquire the first voltage of the battery, the second voltage of the battery cell, and the charging current of the battery;

A determining module 420, configured to determine the impedance of the battery protection board according to the first voltage, the second voltage and the charging current;

The processing module 430 is configured to compare the impedance with a preset value to obtain a comparison result; and determine whether there is a short circuit in the battery connector according to the comparison result.

Optionally, the processing module 430 is also used for:

If the comparison result is that the impedance is less than the preset value, it is determined that there is a short circuit in the battery connector;

If the comparison result is that the impedance is greater than or equal to the preset value, it is determined that the battery connector is not short-circuited.

Optionally, the processing module 430 is also used for:

If the comparison result shows that the impedance is less than the preset value for a predetermined number of consecutive times, it is determined that there is a short circuit in the battery connector.

Optionally, the determining module 420 is also used for:

determining a voltage difference between the first voltage and the second voltage;

Determine the quotient of the voltage difference and the charging current as the impedance of the battery protection board.

Optionally, the preset value is a preset fixed value.

Optionally, the battery includes a current-sensing resistor and a MOS transistor;

The preset value is determined according to the resistance value of the current-sensing resistor, the DC impedance of the MOS transistor, and the wiring impedance.

Optionally, the trace impedance includes a positive trace impedance and a negative trace impedance.

The battery connector short-circuit detection device provided in this embodiment can implement the embodiments of the above-mentioned method, and its implementation principle and technical effect are similar, and will not be repeated here.

FIG. 5 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention. As shown in FIG. 5 , a schematic structural diagram of an electronic device 500 suitable for implementing the embodiment of the present application is shown.

As shown in FIG. 5 , an electronic device 500 includes a central processing unit (CPU) 501, which can operate according to a program stored in a read-only memory (ROM) 502 or a program loaded from a storage section 508 into a random access memory (RAM) 503 Instead, various appropriate actions and processes are performed. In the RAM 503, various programs and data necessary for the operation of the device 500 are also stored. The CPU 501 , ROM 502 , and RAM 503 are connected to each other through a bus 504 . An input/output (I/O) interface 505 is also connected to the bus 504 .

The following components are connected to the I/O interface 505: an input section 506 including a keyboard, a mouse, etc.; an output section 507 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker; a storage section 508 including a hard disk, etc. and a communication section 509 including a network interface card such as a LAN card, a modem, or the like. The communication section 509 performs communication processing via a network such as the Internet. Drive 510 is also connected to I/O interface 506 as needed. A removable medium 511, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is mounted on the drive 510 as necessary so that a computer program read therefrom is installed into the storage section 508 as necessary.

In particular, according to an embodiment of the present disclosure, the process described above with reference to FIG. 1 may be implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program tangibly stored on a machine-readable medium, and the computer program includes program codes for executing the above-mentioned processing method for starting an application program. In such an embodiment, the computer program may be downloaded and installed from a network via communication portion 509 and/or installed from removable media 511 .

The flowchart and block diagrams in the Figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, program segment, or part of code that includes one or more logical functions for implementing specified executable instructions. It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. It should also be noted that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by a dedicated hardware-based system that performs the specified functions or operations , or may be implemented by a combination of dedicated hardware and computer instructions.

The units or modules involved in the embodiments described in the present application may be implemented by means of software or by means of hardware. The described units or modules may also be provided in a processor. The names of these units or modules do not constitute limitations on the units or modules themselves in some cases.

As another aspect, the present application also provides a storage medium, which may be the storage medium contained in the aforementioned device in the above embodiment, or may be a storage medium that exists independently and is not assembled into the device. The storage medium stores one or more programs, and the aforementioned programs are used by one or more processors to execute the processing method for starting an application described in this application.

The above description is only a preferred embodiment of the present application and an illustration of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solution formed by the specific combination of the above-mentioned technical features, but should also cover the technical solution formed by the above-mentioned technical features without departing from the inventive concept. Other technical solutions formed by any combination of or equivalent features thereof. For example, a technical solution formed by replacing the above-mentioned features with technical features with similar functions disclosed in (but not limited to) this application.

Claims (10)

1. A battery connector short circuit detection method is applied to a battery, the battery comprises a battery core, a battery protection plate and a battery connector which are sequentially connected, and the method is characterized by comprising the following steps:

respectively acquiring a first voltage of the battery, a second voltage of the battery cell and a charging current of the battery;

determining the impedance of the battery protection board according to the first voltage, the second voltage and the charging current;

comparing the impedance with a preset value to obtain a comparison result;

and determining whether the battery connector has a short circuit according to the comparison result.

2. The method of claim 1, wherein said determining whether a short circuit exists in the battery connector based on the comparison comprises:

if the impedance is smaller than the preset value according to the comparison result, determining that the battery connector is short-circuited;

and if the comparison result is that the impedance is greater than or equal to the preset value, determining that the battery connector is not short-circuited.

3. The method of claim 2, wherein determining that the battery connector is shorted if the impedance is less than the predetermined value as a result of the comparison comprises:

and if the continuous preset times of the comparison result are that the impedance is smaller than the preset value, determining that the battery connector has a short circuit.

4. The method according to any one of claims 1 to 3, wherein the determining the impedance of the battery protection board according to the first voltage, the second voltage, and the charging current comprises:

determining a voltage difference of the first voltage and the second voltage;

and determining the quotient of the voltage difference and the charging current as the impedance of the battery protection board.

5. A method according to any of claims 1-3, characterized in that the preset value is a fixed value set in advance.

6. The method of any one of claims 1-3, wherein the battery comprises a current sensing resistor and a MOS transistor;

the preset value is determined according to the resistance value of the current detection resistor, the direct current impedance of the MOS transistor and the wiring impedance.

7. The method of claim 6, wherein the trace impedances include a positive trace impedance and a negative trace impedance.

8. The utility model provides a battery connector short circuit detection device, is applied to the battery, the battery is including electric core, battery protection shield, the battery connector that connects gradually, its characterized in that, the device includes:

the acquisition module is used for respectively acquiring a first voltage of the battery, a second voltage of the battery core and a charging current of the battery;

the determining module is used for determining the impedance of the battery protection board according to the first voltage, the second voltage and the charging current;

the processing module is used for comparing the impedance with a preset value to obtain a comparison result; and determining whether there is a short circuit in the battery connector according to the comparison result.

9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the battery connector short detection method of any of claims 1-7 when executing the program.

10. A readable storage medium on which a computer program is stored which, when executed by a processor, carries out the battery connector short detection method according to any one of claims 1 to 7.

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