CN108445343A - A kind of power battery internal short-circuit detection method and system - Google Patents

Abstract

The invention discloses a method and system for detecting an internal short circuit of a power battery. The method includes: collecting the terminal voltage of each battery pack in the power battery; connecting all terminal voltages in series to construct a closed detection model; calculating the voltage of each adjacent two terminals The correlation coefficient, and determine the correlation coefficient as the detection coefficient of the battery pack corresponding to the previous terminal voltage of the two adjacent terminal voltages; judge whether all detection coefficients are higher than the set threshold; if so, determine the power battery internal No short-circuit fault occurs; if not, the battery pack corresponding to the detection coefficient not higher than the set threshold is determined as the battery pack with short-circuit fault. By constructing a closed detection model, the present invention can quickly and effectively detect the short-circuit fault of the battery on the one hand and ensure the safety of the power battery; Inaccurate, unstable and other issues.

Description

Method and system for detecting internal short circuit of power battery

technical field

The invention relates to the technical field of power batteries, in particular to a method and system for detecting short circuits inside a power battery.

Background technique

Power batteries have been widely used in electric vehicles, and the safety and reliability of power batteries are directly related to the safe use of electric vehicles. The application of power batteries is affected by its characteristics, and has special requirements for ambient temperature and usage methods. In the application process, it is not only necessary to ensure that it operates in a good temperature environment, but also to set a reasonable usage method and detection method. , The reasonable use method ensures the maximum performance of the power battery, and the detection method ensures that the power battery can be found in time when there is a problem, so as to avoid causing greater damage to the power battery or even battery safety accidents.

The internal short circuit of the power battery is a safety-related problem during the use of the power battery. The following points may cause the internal short circuit of the power battery: First, the power battery is charged at low temperature, which is determined by the performance of the power battery, such as charging at low temperature , the battery is easy to form crystals, and the cumulative growth of crystals will pierce the battery diaphragm, which will cause a short circuit in the power battery; second, in the case of overcharge or overdischarge of the power battery, it will cause irreversible ions. It will cause a short circuit in the power battery.

Since the power battery is generally packaged in a single package, there is no direct method to detect the internal short circuit. In the process of use, the method of regular maintenance is generally adopted to regularly test the power battery. For example, set a certain use time, fully charge and fully discharge the power battery, collect and analyze battery data through equipment, and perform manual maintenance on suspicious batteries (battery capacity decline, etc.).

Contents of the invention

The purpose of the present invention is to provide a method and system for internal short-circuit detection of a power battery. The terminal voltage data collected by the battery pack is innovatively designed as a closed-loop system, which makes up for the shortcomings of the current detection method for an internal short-circuit of a power battery and simplifies the traditional The hardware facilities required for circuit fault detection reduce the equipment cost and expand the scope of application. Meanwhile, the advantages of the present invention being simple and easy to implement ensure the reliability and safety of the power battery during use.

To achieve the above object, the present invention provides the following scheme:

A method for detecting an internal short circuit of a power battery, the method for detecting an internal short circuit of a power battery includes:

Collect the terminal voltage of each battery pack in the power battery; the power battery includes n battery packs;

judging whether each of the terminal voltages is greater than a voltage threshold, and obtaining a first judging result;

If the first judgment result indicates that the terminal voltage is greater than the voltage threshold, it is judged whether the duration of all the terminal voltages greater than the voltage threshold is greater than a preset time, and a second judgment result is obtained;

If the first judgment result indicates that all the terminal voltages are less than or equal to the voltage threshold, then connect all the terminal voltages in series to construct a closed detection model; the closed detection model includes n terminal voltages, and the first The terminal voltage of one battery pack is also connected to the terminal voltage of the last battery pack;

If the second judgment result indicates that the duration of the terminal voltage greater than the voltage threshold is greater than a preset time, then it is determined that the power battery is faulty;

If the second judgment result indicates that the duration of all the terminal voltages greater than the voltage threshold is less than or equal to the preset time, connecting all the terminal voltages in series to construct a closed detection model;

calculating a correlation coefficient between every adjacent two terminal voltages, and determining the correlation coefficient as the detection coefficient of the battery pack corresponding to the previous terminal voltage among the two adjacent terminal voltages;

judging whether all the detection coefficients are higher than a set threshold, and obtaining a third judging result;

If the third judgment result indicates that all the detection coefficients are higher than the set threshold, it is determined that no short-circuit fault occurs inside the power battery;

If the third judgment result indicates that all the detection coefficients are not higher than the set threshold, then determine the battery pack corresponding to the detection coefficient that is not higher than the set threshold as the battery that has a short-circuit fault group, and save the terminal voltage of the battery pack that has a short-circuit fault.

Optionally, the calculation of the correlation coefficient between each adjacent two terminal voltages, and determining the correlation coefficient as the detection coefficient of the battery pack corresponding to the previous terminal voltage of the two adjacent terminal voltages, Specifically include:

A correlation coefficient algorithm is used to calculate the correlation coefficient between every two adjacent terminal voltages, and determine the correlation coefficient as the detection coefficient of the battery pack corresponding to the previous terminal voltage among the two adjacent terminal voltages.

Optionally, the set threshold is 0.75.

Optionally, the voltage threshold ranges from 2.0V to 3.65V.

Optionally, the preset time is 1 minute.

The present invention also provides a power battery internal short circuit detection system, the power battery internal short circuit detection system includes:

A terminal voltage collection module, configured to collect the terminal voltage of each battery pack in the power battery; the power battery includes n battery packs;

A first judgment result obtaining module, configured to judge whether each of the terminal voltages is greater than a voltage threshold, and obtain a first judgment result;

The second judgment result obtaining module is configured to judge whether the duration of all the terminal voltages greater than the voltage threshold is greater than a preset time when the first judgment result indicates that the terminal voltage is greater than the voltage threshold, and obtain second judgment result;

A closure detection model building block, used for when the first judgment result indicates that all the terminal voltages are less than or equal to the voltage threshold or the second judgment result indicates that the duration of all the terminal voltages is greater than the voltage threshold When it is less than or equal to the preset time, all the terminal voltages are connected in series to construct a closed detection model; the closed detection model includes n terminal voltages, and the terminal voltage of the first battery pack is also related to the terminal voltage of the last battery pack The terminal voltage is connected;

A power battery failure determination module, configured to determine that the power battery has a failure when the second judgment result indicates that the duration of the terminal voltage greater than the voltage threshold is longer than a preset time;

A correlation coefficient calculation module, configured to calculate a correlation coefficient between every two adjacent terminal voltages, and determine the correlation coefficient as the detection coefficient of the battery pack corresponding to the previous terminal voltage of the two adjacent terminal voltages ;

A third judging result obtaining module, configured to judge whether all the detection coefficients are higher than a set threshold, and obtain a third judging result;

A determination module that no short-circuit fault occurs inside the power battery, configured to determine that no short-circuit fault occurs inside the power battery when the third judgment result indicates that all the detection coefficients are higher than the set threshold;

A battery pack determination module where a short-circuit fault occurs, for when the third judgment result indicates that all the detection coefficients are not higher than the set threshold, set the detection coefficients corresponding to the detection coefficients that are not higher than the set threshold The battery pack is determined as a short-circuit faulty battery pack, and the terminal voltage of the short-circuit faulty battery pack is saved.

Optionally, the correlation coefficient calculation module specifically includes:

A correlation coefficient calculation unit, configured to use a correlation coefficient algorithm to calculate a correlation coefficient between each adjacent two terminal voltages, and determine the correlation coefficient as the corresponding value of the previous terminal voltage among the two adjacent terminal voltages The detection coefficient of the battery pack.

According to the specific embodiments provided by the invention, the invention discloses the following technical effects:

The present invention provides a power battery internal short circuit detection method and system. The detection method includes: collecting the terminal voltage of each battery group in the power battery; the power battery includes n said battery groups; judging the voltage of each said terminal Whether the voltage is greater than the voltage threshold, obtain a first judgment result; if the first judgment result indicates that the terminal voltage is greater than the voltage threshold, then judge whether the duration of all the terminal voltages greater than the voltage threshold is greater than a preset time, obtain the second judgment result; if the first judgment result indicates that all the terminal voltages are less than or equal to the voltage threshold, all the terminal voltages are connected in series to build a closed detection model; the closed detection model includes n the terminal voltage, and the terminal voltage of the first battery pack is also connected to the terminal voltage of the last battery pack; if the second judgment result indicates that the duration of the terminal voltage greater than the voltage threshold is longer than the predetermined time If the time is set, it is determined that the power battery has failed; if the second judgment result indicates that the duration of all the terminal voltages greater than the voltage threshold is less than or equal to the preset time, then all the terminal voltages are connected in series , constructing a closure detection model; calculating a correlation coefficient between every adjacent two terminal voltages, and determining the correlation coefficient as the detection coefficient of the battery pack corresponding to the previous terminal voltage of the two adjacent terminal voltages; judging whether all the detection coefficients are higher than the set threshold, and obtaining a third judgment result; if the third judgment result indicates that all the detection coefficients are higher than the set threshold, then it is determined that the power battery is not A short-circuit fault occurs; if the third judgment result indicates that all the detection coefficients are not higher than the set threshold value, then determine the battery pack corresponding to the detection coefficient that is not higher than the set threshold value as having occurred short-circuit faulty battery pack, and save the terminal voltage of the short-circuit faulty battery pack. By building a closed detection model, the present invention can quickly and effectively detect the short-circuit fault of the battery on the one hand, ensuring the safety of the power battery; Inaccurate, unstable and other issues.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without paying creative labor.

Fig. 1 is a schematic flow chart of a method for detecting an internal short circuit of a power battery according to an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a power battery internal short circuit detection system according to an embodiment of the present invention;

3 is a schematic structural diagram of a device for collecting voltages at each terminal of a lithium-ion power battery according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a closed-loop detection system for a lithium-ion power battery according to an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

At present, some methods for the internal short circuit of electric vehicle batteries have been proposed. For example, a threshold value detection method, specifically, when the vehicle is running or charging again, detects whether the minimum voltage of the battery is lower than the set value and lasts for a predetermined time, and judges whether there is a short circuit; The working parameters and the look-up function determine the fault level of the battery; another example is based on the threshold detection method, which proposes to judge whether the battery has internal short circuit safety hazards by judging whether the deviation between each terminal voltage and the average voltage is greater than the safety limit. The above three methods all have the following disadvantages. First, they cannot eliminate the interference caused by the acquisition noise, resulting in unstable fault diagnosis results; second, they cannot clearly locate the fault location, requiring follow-up manual detection, which is costly and inefficient; The calculation of battery parameters by the least squares method requires high sampling data, which leads to misjudgment of faults.

Therefore, in order to overcome the above-mentioned technical shortcomings, the present invention provides a power battery internal short-circuit detection method and system, which innovatively designs the terminal voltage data collected by the battery pack as a closed-loop system, making up for the current power battery internal short-circuit detection method. It simplifies the hardware facilities required for traditional circuit fault detection, reduces the equipment cost, and expands the scope of application. At the same time, the advantages of the invention are simple and easy to implement to ensure the reliability and safety of the power battery during use.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The method for detecting short circuit in the lithium-ion power battery of the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention and not to limit the present invention. 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.

Embodiment one

Fig. 1 is a schematic flowchart of a method for detecting an internal short circuit of a power battery according to an embodiment of the present invention. As shown in Fig. 1 , a method for detecting an internal short circuit of a power battery, the method for detecting an internal short circuit of a power battery specifically includes the following steps:

Step 101: Collect the terminal voltage of each battery pack in the power battery; the power battery includes n battery packs.

Step 102: Judging whether each of the terminal voltages is greater than the voltage threshold, and obtaining a first judgment result; if the first judgment result indicates that the terminal voltage is greater than the voltage threshold, then perform step 103; if the first judgment If the result indicates that all the terminal voltages are less than or equal to the voltage threshold, step 104 is executed.

Step 103: Judging whether the duration of all the terminal voltages greater than the voltage threshold is greater than a preset time, and obtaining a second judgment result. If the second judgment result indicates that the duration of the terminal voltage greater than the voltage threshold is greater than the preset time, then perform step 105; if the second judgment result indicates that all the terminal voltages are greater than the voltage threshold If the duration is less than or equal to the preset time, step 104 is executed.

Step 104: Connect all the terminal voltages in series to build a closure detection model; the closure detection model includes n terminal voltages, and the terminal voltage of the first battery pack is also connected with the terminal voltage of the last battery pack.

Step 105: Determine that the power battery is faulty.

Step 106: Calculate the correlation coefficient between every two adjacent terminal voltages, and determine the correlation coefficient as the detection coefficient of the battery pack corresponding to the preceding one of the two adjacent terminal voltages.

Step 107: Judging whether all the detection coefficients are higher than the set threshold, and obtaining a third judgment result; if the third judgment result indicates that all the detection coefficients are higher than the set threshold, then perform step 108; If the third determination result indicates that all the detection coefficients are not higher than the set threshold, step 109 is executed.

Step 108: Determine that no short circuit fault occurs inside the power battery.

Step 109: Determining the battery packs corresponding to the detection coefficients not higher than the set threshold as the battery packs with short-circuit faults, and storing the terminal voltages of the short-circuit faulty battery packs.

Wherein step 106 specifically comprises:

A correlation coefficient algorithm is used to calculate the correlation coefficient of every two adjacent terminal voltages, and determine the correlation coefficient as the detection coefficient of the battery pack corresponding to the previous terminal voltage of the two adjacent terminal voltages.

Preferably, the set threshold is 0.75. The voltage threshold ranges from 2.0V to 3.65V. The preset time is 1 minute.

Embodiment two

To achieve the above object, the present invention also provides a detection system for internal short circuit of a power battery.

Fig. 2 is a schematic structural diagram of a power battery internal short-circuit detection system according to an embodiment of the present invention. As shown in Fig. 2, the power battery internal short-circuit detection system includes:

The terminal voltage collection module 201 is used to collect the terminal voltage of each battery pack in the power battery; the power battery includes n battery packs.

The first judging result obtaining module 202 is configured to judge whether each of the terminal voltages is greater than a voltage threshold to obtain a first judging result.

The second judgment result obtaining module 203 is configured to judge whether the duration of all the terminal voltages greater than the voltage threshold is greater than a preset time when the first judgment result indicates that the terminal voltage is greater than the voltage threshold, Get the second judgment result.

The closure detection model construction module 204 is configured to: when the first judgment result indicates that all the terminal voltages are less than or equal to the voltage threshold or the second judgment result indicates that all the terminal voltages greater than the voltage threshold continue When the time is less than or equal to the preset time, connect all the terminal voltages in series to build a closed detection model; the closed detection model includes n terminal voltages, and the terminal voltage of the first battery pack is also related to the terminal voltage of the last battery The terminal voltage of the group is connected.

The power battery failure determination module 205 is configured to determine that the power battery has a failure when the second judgment result indicates that the duration of the terminal voltage greater than the voltage threshold is longer than a preset time.

A correlation coefficient calculation module 206, configured to calculate a correlation coefficient between every two adjacent terminal voltages, and determine the correlation coefficient as the detection of the battery pack corresponding to the previous terminal voltage of the two adjacent terminal voltages coefficient.

The third judging result obtaining module 207 is configured to judge whether all the detection coefficients are higher than a set threshold, and obtain a third judging result.

The determination module 208 that no short-circuit fault occurs inside the power battery is configured to determine that no short-circuit fault occurs inside the power battery when the third judgment result indicates that all the detection coefficients are higher than the set threshold.

The short-circuit failure battery pack determination module 209 is configured to: when the third judgment result indicates that all the detection coefficients are not higher than the set threshold, the detection coefficients that are not higher than the set threshold The corresponding battery pack is determined as a short-circuit faulty battery pack, and the terminal voltage of the short-circuit faulty battery pack is saved.

The correlation coefficient calculation module 206 specifically includes:

A correlation coefficient calculation unit, configured to use a correlation coefficient algorithm to calculate a correlation coefficient between each adjacent two terminal voltages, and determine the correlation coefficient as the corresponding value of the previous terminal voltage among the two adjacent terminal voltages The detection coefficient of the battery pack.

Preferably, the set threshold is 0.75. The voltage threshold ranges from 2.0V to 3.65V. The preset time is 1 minute.

Embodiment Three

An embodiment of the present invention provides a method for detecting an internal short circuit of a lithium ion power battery, which is used to detect whether an internal short circuit occurs in the lithium ion power battery, so as to avoid serious accidents.

Fig. 3 is the structural schematic diagram of the device that collects each terminal voltage of lithium-ion power battery according to the embodiment of the present invention; As shown in Fig. Voltage. Since the battery pack voltage acquisition chip detects the voltage of 12 battery packs at most, four battery pack voltage acquisition chips are required, of which three battery pack voltage acquisition chips collect 36 battery pack voltages, and the remaining 6 battery packs also need a battery pack Voltage acquisition chip, so this battery pack voltage acquisition chip needs to detect the voltage of the 6 battery packs in another battery pack while detecting the 6 battery packs in the battery pack.

Taking a lithium-ion power battery pack and BnS voltage mode of an electric vehicle as an example, the short-circuit detection steps in the power battery are described in detail.

In the first step, BnS collects the terminal voltage of each battery pack in the power battery.

The second step is to judge whether the collected terminal voltage exceeds the voltage threshold. If the collected terminal voltage exceeds the set voltage threshold and the duration is longer than the preset time, a fault alarm will be issued; if the collected terminal voltage is within the voltage threshold, the voltage If it is normal, perform short circuit detection in the power battery.

In the third step, according to the collected terminal voltage value of the first battery pack and the terminal voltage value of the second battery pack, the correlation coefficient algorithm is used to calculate the correlation coefficient of the first battery pack, and the correlation coefficient of the second battery pack is calculated. Calculate the correlation coefficient between the terminal voltage value of the third battery group and the terminal voltage value of the third battery group, and so on, calculate the last The correlation coefficient of the battery pack, therefore, the entire detection process forms a closed-loop detection system as shown in Figure 4. The number of correlation coefficients is consistent with the number of battery pack terminal voltages.

The terminal voltage is the voltage across the battery pack. The preset time is set to 1 minute, and the voltage threshold is set to the cut-off voltage of the charging and discharging point of the battery. Different battery materials have different cut-off voltages. In the embodiment of the present invention, the voltage threshold range of the battery is set to [2.0V 3.65V].

BnS acquisition terminal voltage {V1; V2; V3;...; Vn}, corresponding to the correlation coefficient is {ICC1,2; ICC2,3;...;ICCn,1}.

If the correlation coefficients ICCn,1 and ICC1,2 detect the fault problem, the internal short circuit fault of the first battery pack can be quickly located, and so on, if the correlation coefficient ICC5,6 and ICC6,7 detect the fault problem, then The internal short circuit fault of the sixth battery pack can be quickly located.

The overall fault detection process and the short-circuit detection method in the battery pack based on the correlation coefficient are shown in Figure 1.

For the correlation coefficient implemented in this example, the intragroup correlation coefficient is used. According to the principle of the correlation coefficient, when the coefficient value is lower than 0.75, it is considered that there is a malfunction, and if it is higher than 0.75, it is considered normal.

If the correlation coefficient of each pair of battery packs in the battery pack is higher than the set threshold, the voltage information of the battery is ignored. If the correlation coefficient of each pair of battery packs in the battery pack is lower than the set threshold, the voltage information of the battery is saved and a fault alarm is issued to end the internal short circuit detection process.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

In this paper, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; meanwhile, for those of ordinary skill in the art, according to the present invention Thoughts, there will be changes in specific implementation methods and application ranges. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (7)

1. a kind of power battery internal short-circuit detection method, which is characterized in that the power battery internal short-circuit detection method packet It includes：

Acquire the terminal voltage of each battery pack in power battery；The power battery includes the n battery packs；

Judge whether each terminal voltage is more than voltage threshold, obtains the first judging result；

If first judging result indicates that the terminal voltage is more than the voltage threshold, judge all more than the voltage threshold Whether the duration of the terminal voltage of value is more than preset time, obtains the second judging result；

If first judging result, which indicates that all terminal voltages are respectively less than, is equal to the voltage threshold, by all ends Voltage Series build occlusion detection model；The occlusion detection model includes n terminal voltages, and first battery pack Terminal voltage is also connected with the terminal voltage of the last one battery pack；

If second judging result indicates that the duration of the terminal voltage more than the voltage threshold is more than preset time, Then determine that the power battery breaks down；

If second judging result indicates that the duration of all terminal voltages more than the voltage threshold is less than or equal to All terminal voltages are then connected, build occlusion detection model by the preset time；

The related coefficient between each adjacent two terminal voltage is calculated, and the related coefficient is determined as the two neighboring end electricity The detection coefficient of the corresponding battery pack of previous terminal voltage in pressure；

Judge whether all detection coefficients are above given threshold, obtains third judging result；

If the third judging result indicates that all detection coefficients are above the given threshold, it is determined that the power electric Short trouble does not occur inside pond；

If the third judging result indicates that all detection coefficients are not above the given threshold, will be not higher than described Battery pack corresponding to the detection coefficient of given threshold is determined as that the battery pack of short trouble occurs, and preserves generation short circuit The terminal voltage of the battery pack of failure.

2. power battery internal short-circuit detection method according to claim 1, which is characterized in that described to calculate per adjacent two Related coefficient between a terminal voltage, and the related coefficient is determined as the electricity of the previous end in the two neighboring terminal voltage The detection coefficient for pressing corresponding battery pack, specifically includes：

Using related coefficient algorithm, the related coefficient between each adjacent two terminal voltage is calculated, and the related coefficient is determined For the detection coefficient of the corresponding battery pack of previous terminal voltage in the two neighboring terminal voltage.

3. power battery internal short-circuit detection method according to claim 1, which is characterized in that the given threshold is 0.75。

4. power battery internal short-circuit detection method according to claim 1, which is characterized in that the model of the voltage threshold It encloses for 2.0V~3.65V.

5. power battery internal short-circuit detection method according to claim 1, which is characterized in that the preset time is 1 Minute.

6. a kind of power battery internal short-circuit detecting system, which is characterized in that the power battery internal short-circuit detecting system packet It includes：

Terminal voltage acquisition module, the terminal voltage for acquiring each battery pack in power battery；The power battery includes n institute State battery pack；

First judging result obtains module, for judging whether each terminal voltage is more than voltage threshold, obtains the first judgement As a result；

Second judging result obtains module, for indicating that the terminal voltage is more than the voltage threshold when first judging result When, judge whether the duration of all terminal voltages more than the voltage threshold is more than preset time, obtains second and sentence Disconnected result；

Occlusion detection model construction module, for being equal to institute when first judging result indicates that all terminal voltages are respectively less than It states voltage threshold or second judging result indicates that the duration of all terminal voltages more than the voltage threshold is small When equal to the preset time, all terminal voltages are connected, occlusion detection model is built；The occlusion detection model packet The n terminal voltages are included, and the terminal voltage of first battery pack is also connected with the terminal voltage of the last one battery pack；

Power battery breaks down determining module, for indicating described more than the voltage threshold when second judging result When the duration of terminal voltage is more than preset time, determine that the power battery breaks down；

Related coefficient computing module, for calculating the related coefficient between each adjacent two terminal voltage, and by the related coefficient It is determined as the detection coefficient of the corresponding battery pack of previous terminal voltage in the two neighboring terminal voltage；

Third judging result obtains module, for judging whether all detection coefficients are above given threshold, obtains third Judging result；

Short trouble determining module does not occur inside power battery, for indicating all detections when the third judging result When coefficient is above the given threshold, determines and short trouble does not occur inside the power battery；

Short trouble battery pack determining module occurs, for indicating that all detection coefficients are not equal when the third judging result When higher than the given threshold, the battery pack corresponding to the detection coefficient not higher than the given threshold is determined as occurring The battery pack of short trouble, and preserve the terminal voltage for the battery pack that short trouble occurs.

7. power battery internal short-circuit detecting system according to claim 6, which is characterized in that the related coefficient calculates Module specifically includes：

Related coefficient computing unit, for using related coefficient algorithm, calculating the related coefficient between each adjacent two terminal voltage, And the related coefficient is determined as to the detection system of the corresponding battery pack of previous terminal voltage in the two neighboring terminal voltage Number.