CN113376532A - Detection method, device and system for battery pack balancing module - Google Patents
Detection method, device and system for battery pack balancing module Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention provides a detection method, a detection device and a detection system of a battery pack balancing module, and relates to the technical field of electric automobiles. The detection method comprises the following steps: controlling a charge-discharge module to charge and discharge the battery pack to be detected so as to enable the battery pack to reach a target voltage state; acquiring first battery index information and second battery index information of a battery pack after a preset time of standing before and after adding an equalization module in a target voltage state; acquiring third battery index information and fourth battery index information after multiple charge-discharge cycles are performed on the battery pack before and after the battery pack is added to the target voltage state; and judging the balancing effect of the balancing module according to the first battery index information, the second battery index information, the third battery index information and the fourth battery index information. The scheme of the invention can evaluate whether the equalization module can realize the equalization effect, provide reference for whether the battery pack adopts the equalization module, improve the design efficiency and prolong the service life of the battery pack.
Description
Technical Field
The invention belongs to the technical field of electric automobiles, and particularly relates to a detection method, a detection device and a detection system of a battery pack balancing module.
Background
The battery pack balancing technology is not only related to the service life of the whole battery pack, but also is the basis for reasonably, effectively and safely using the battery pack, so the battery pack balancing technology is always an important research field in a battery management system. The current stage equalization techniques can be divided into two categories, passive equalization and active equalization.
The passive equalization technology mainly refers to a resistance discharge type equalization mode, the method has the advantages of being simple to implement and low in cost, is an early main equalization scheme, and meanwhile has the problems of energy waste, heat dissipation treatment, long equalization time and the like.
The active equalization technology can realize equalization by lossless energy transfer among different batteries, and at present, the active equalization technology has a plurality of circuit forms:
(1) the balance mode of energy transfer between adjacent batteries is realized by utilizing the combination of the switch and the capacitor;
(2) an inductor is used for replacing a capacitor as an energy storage element;
(3) energy bidirectional flow is realized by utilizing a converter, for example, an equalization scheme of an energy transfer channel formed by a direct current converter; in addition, researchers have stepped down the energy of the entire battery pack through a converter, and selected a specific battery to charge through a switch array.
However, the active equalization technique still has the following problems:
(1) some methods only use external voltage as a control object, and the external voltage of the battery is influenced by a plurality of factors such as the direct current internal resistance, the polarization voltage, the available capacity and the SOC (State of Charge), and the relation between the external voltage and the internal State of the battery cannot be established;
(2) the power consumption is high, energy is consumed, a heating phenomenon is accompanied, and an auxiliary heat dissipation system is needed;
(3) the number of the supported batteries is small, partial equalization circuits only provide solutions for a plurality of batteries, and the expansion cannot be carried out according to the number of the series-connected batteries of the battery pack;
(4) the practicality is poor, and in practical application, electric automobile requires for the volume of equalizer circuit small enough in order to satisfy concrete installation condition, still need compromise the cost simultaneously.
How to detect and evaluate whether the equalization technologies are helpful to the consistency of the battery pack and whether the equalization technologies are suitable for being adopted on a vehicle does not exist at present, and a perfect and uniform measurement index and test method are not provided. The existing detection device of the battery pack balancing technology reads the voltage between the sections only by carrying out differential amplification on the voltage of the single body, and when the voltage exceeds a set value, the detection device can respectively charge and discharge each battery through the device so as to achieve a balanced state, and how to detect a balancing method and a balancing device is not introduced. And a switching circuit formed by connecting a plurality of photoelectric couplers connected in parallel in series with a toggle switch is also used for detecting the voltage of the battery. The battery pack is selectively charged, so that each single battery of the battery pack is in a balanced state when the automobile starting power supply battery pack is assembled. The two methods are realized by detecting the voltage of a single Battery, and the unbalanced Battery is charged and discharged independently to achieve balance, and the balance method of the method is not practical in the vehicle power Battery pack, firstly, the number of the Battery strings of the vehicle Battery pack is large, dozens of the Battery strings or even hundreds of the Battery strings, and a balance module is generally integrated in a BMS (Battery Management System) or exists in an independent controller; and secondly, it is not possible to charge certain batteries separately.
Therefore, the balancing capability and the balancing effect of the balancing module need to be directly detected, and whether the balancing module can be applied to a vehicle or not is judged, so that the design efficiency in the early stage is improved, and the service life of the battery pack is prolonged.
Disclosure of Invention
The embodiment of the invention aims to provide a method, a device and a system for detecting a battery pack balancing module, so as to solve the problem that the balancing effect of the balancing module is not detected and evaluated and whether the balancing module is suitable for product application or not in the prior art.
In order to achieve the above object, an embodiment of the present invention provides a method for detecting a battery pack balancing module, including:
controlling a charge-discharge module to charge and discharge a battery pack to be detected so as to enable the battery pack to reach a target voltage state;
acquiring first battery index information of the battery pack in the target voltage state after the balancing module is not added and is kept standing for a preset time, and acquiring second battery index information of the battery pack in the target voltage state after the balancing module is added and reaches the preset time;
acquiring third battery index information after the equalization module is not added to perform multiple charge-discharge cycles on the battery pack in the target voltage state, and acquiring fourth battery index information after the equalization module is added to perform multiple charge-discharge cycles on the battery pack in the target voltage state;
and judging the balancing effect of the balancing module according to the first battery index information, the second battery index information, the third battery index information and the fourth battery index information.
Optionally, the target voltage state is: the method comprises the following steps that on the basis that the battery pack has a target charge value, a first charge value is discharged to a first preset number of batteries in the battery pack, and a second charge value is charged to a second preset number of batteries outside the first preset number of batteries in the battery pack.
Optionally, performing a plurality of charge-discharge cycles on the battery pack includes:
the battery pack is charged with constant current and then with constant voltage until the current is smaller than a preset current value or the voltage is smaller than a preset voltage value;
the battery pack is kept still for a preset time;
discharging the battery pack to the preset voltage value in a constant current manner;
and the battery pack stands for the preset time.
Optionally, determining a balancing effect of the balancing module according to the first battery index information, the second battery index information, the third battery index information, and the fourth battery index information includes:
when the first battery index information, the second battery index information, the third battery index information and the fourth battery index information are judged to meet at least one of the following conditions, determining that the balancing module has a balancing effect:
the voltage difference of the single battery is smaller than the preset voltage difference of the battery pack;
the equalizing current is greater than the preset current of the battery pack;
the capacitance increase percentage is greater than a preset increase value.
The embodiment of the invention also provides a detection device for the battery pack balancing module, which comprises:
the charging and discharging control module is used for controlling the charging and discharging module to charge and discharge the battery pack to be detected so as to enable the battery pack to reach a target voltage state;
the first information acquisition module is used for acquiring first battery index information of the battery pack in the target voltage state after the equalization module is not added and is kept standing for a preset time, and acquiring second battery index information of the battery pack in the target voltage state after the equalization module is added and reaches the preset time;
the second information acquisition module is used for acquiring third battery index information after the equalization module is not added to perform multiple charge and discharge cycles on the battery pack in the target voltage state, and acquiring fourth battery index information after the equalization module is added to perform multiple charge and discharge cycles on the battery pack in the target voltage state;
and the analysis module is used for judging the balancing effect of the balancing module according to the first battery index information, the second battery index information, the third battery index information and the fourth battery index information.
Optionally, the target voltage state is: the method comprises the following steps that on the basis that the battery pack has a target charge value, a first charge value is discharged to a first preset number of batteries in the battery pack, and a second charge value is charged to a second preset number of batteries outside the first preset number of batteries in the battery pack.
Optionally, performing a plurality of charge-discharge cycles on the battery pack includes:
the battery pack is charged with constant current and then with constant voltage until the current is smaller than a preset current value or the voltage is smaller than a preset voltage value;
the battery pack is kept still for a preset time;
discharging the battery pack to the preset voltage value in a constant current manner;
and the battery pack stands for the preset time.
Optionally, the determining, by the analysis module, a balancing effect of the balancing module according to the first battery index information, the second battery index information, the third battery index information, and the fourth battery index information includes:
when the first battery index information, the second battery index information, the third battery index information and the fourth battery index information are judged to meet at least one of the following conditions, determining that the balancing module has a balancing effect:
the voltage difference of the single battery is smaller than the preset voltage difference of the battery pack;
the equalizing current is greater than the preset current of the battery pack;
the capacitance increase percentage is greater than a preset increase value.
The embodiment of the invention also provides a detection system of the battery pack balancing module, which comprises a charge-discharge module and the detection device.
Optionally, the detection system further includes a battery index collection module connected to the charge/discharge module, and configured to collect first battery index information, second battery index information, third battery index information, and fourth battery index information.
Optionally, the battery indicator collecting module comprises a voltage collecting module and/or a current collecting module.
The technical scheme of the invention at least has the following beneficial effects:
in the above scheme of the embodiment of the present invention, the method for detecting the battery pack balancing module includes: controlling a charge-discharge module to charge and discharge a battery pack to be detected so as to enable the battery pack to reach a target voltage state; acquiring first battery index information of the battery pack in the target voltage state after the balancing module is not added and is kept standing for a preset time, and acquiring second battery index information of the battery pack in the target voltage state after the balancing module is added and reaches the preset time; acquiring third battery index information after the equalization module is not added to perform multiple charge-discharge cycles on the battery pack in the target voltage state, and acquiring fourth battery index information after the equalization module is added to perform multiple charge-discharge cycles on the battery pack in the target voltage state; and judging the balancing effect of the balancing module according to the first battery index information, the second battery index information, the third battery index information and the fourth battery index information. The scheme of the invention judges whether the equalization module can realize the equalization effect by acquiring the battery index information, and provides reference for whether the battery pack adopts the equalization module.
Drawings
Fig. 1 is a schematic diagram of a detection system of a battery pack balancing module according to an embodiment of the present invention;
fig. 2 is a flowchart of a detection method of a battery pack balancing module according to an embodiment of the present invention;
fig. 3 is a flowchart of a charge and discharge cycle of a battery pack according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a variation of a cell voltage when a battery pack according to an embodiment of the present invention is placed still after adding an equalization module;
FIG. 5 is a schematic diagram of the maximum differential pressure of the cells during the rest of the battery pack according to an embodiment of the present invention;
fig. 6 is a schematic diagram of the maximum differential pressure of the monomer during the cyclic charge and discharge process after the equalization module is added to the battery pack according to the embodiment of the invention;
FIG. 7 is a schematic diagram of the capacity change of a power battery pack before and after adding an equalization module according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a maximum equalizing current value in a testing process according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The embodiment of the invention provides a method, a device and a system for detecting a battery pack balancing module, aiming at the problem that the balancing effect of the balancing module is not detected and evaluated and whether the balancing effect is suitable for product application or not in the prior art.
As shown in fig. 1, an embodiment of the present invention provides a detection system for a battery pack balancing module, including: a charge-discharge module.
Specifically, the detection system further comprises a battery index acquisition module connected with the charging and discharging module and used for acquiring first battery index information, second battery index information, third battery index information and fourth battery index information.
Specifically, the battery index collection module includes: the device comprises a voltage acquisition module and/or a current acquisition module.
In this embodiment of the present invention, the battery pack to be detected includes n batteries; the charge-discharge module is connected with the battery pack to be detected. The battery index acquisition module is used for respectively acquiring the battery index information of each battery. The battery index acquisition module can be connected with the equalization module to be detected for equalization. It should be noted that the battery indicator collection module includes, but is not limited to, current and voltage collection, and may also include data collection such as temperature and resistance. The battery index acquisition module transmits the acquired battery index information of the battery pack to the upper computer through the data conversion module. The data conversion module comprises mutual conversion among RS232 signals, RS485 signals, USB signals, CAN signals and the like, and the specific conversion mode needs to be matched with software of an upper computer for use. The detection system can acquire the current value of each channel and judge the maximum current of the equalization module; the voltage state consistency of the battery pack can be flexibly adjusted, so that the capacitance improvement effect in the standing and charging and discharging processes can be more conveniently observed.
As shown in fig. 2, an embodiment of the present invention provides a method for detecting a battery pack balancing module, including:
step S1, controlling the charge and discharge module to charge and discharge the battery pack to be detected, so that the battery pack reaches a target voltage state;
step S2, acquiring first battery index information of the battery pack in the target voltage state after the balancing module is not added and is kept still for a preset time, and acquiring second battery index information of the battery pack in the target voltage state after the balancing module is added and reaches the preset time;
step S3, obtaining third battery index information after the equalization module is not added to perform multiple charge and discharge cycles on the battery pack in the target voltage state, and obtaining fourth battery index information after the equalization module is added to perform multiple charge and discharge cycles on the battery pack in the target voltage state;
step S4, determining a balancing effect of the balancing module according to the first battery index information, the second battery index information, the third battery index information, and the fourth battery index information.
In the embodiment of the invention, the detection method of the battery pack balancing module is suitable for the balancing module independent of the BMS or subordinate to the BMS, and the balancing capability of the balancing module is judged by acquiring the battery index information, so that reference is provided for whether a product uses the balancing module, the design efficiency in the early stage is improved, and the service life of the battery pack is prolonged.
It should be noted that the equalization test in the static state and the equalization test in the charge-discharge cycle process are performed, but not sequentially.
In an optional embodiment of the present invention, the target voltage state is: the method comprises the following steps that on the basis that the battery pack has a target charge value, a first charge value is discharged to a first preset number of batteries in the battery pack, and a second charge value is charged to a second preset number of batteries outside the first preset number of batteries in the battery pack.
In this embodiment of the present invention, in step S1, the making the battery pack reach the target voltage state specifically includes:
adjusting the battery pack connected with the n batteries to have a target charge value a%;
discharging a first preset number (m) of batteries in the battery pack on the basis of the target charge value a%, wherein the discharge amount is a first charge value b%, and the charge value of the first preset number (m) of batteries is the difference between the target charge value and the first charge value, namely (a-b)%;
charging a second preset number (l) of batteries out of the first preset number of batteries in the battery pack on the basis of the target charge value a%, wherein the charge amount is a second charge value c%, and the charge value of the second preset number (l) of batteries is the sum of the target charge value and the second charge value, namely (a + c)%;
the SOC consistency of the battery can be flexibly adjusted, the static state and the capacity improving effect in the charging and discharging process can be more conveniently observed, and the SOC range can reach 0-100%. It is noted that the first preset number is smaller than the number of the battery packs, i.e. (m < n); the second preset number is smaller than a difference between the number of the battery packs and the first preset number, i.e., (l < n-m).
Step S3, performing a plurality of charge/discharge cycles on the battery pack includes:
the battery pack is charged with constant current and then with constant voltage until the current is smaller than a preset current value or the voltage is smaller than a preset voltage value;
the battery pack is kept still for a preset time;
discharging the battery pack to the preset voltage value in a constant current manner;
and the battery pack stands for the preset time.
Step S4, determining the balancing effect of the balancing module according to the first battery index information, the second battery index information, the third battery index information, and the fourth battery index information, including:
when the first battery index information, the second battery index information, the third battery index information and the fourth battery index information are judged to meet at least one of the following conditions, determining that the balancing module has a balancing effect:
the voltage difference of the single battery is smaller than the preset voltage difference of the battery pack;
the equalizing current is greater than the preset current of the battery pack;
the capacitance increase percentage is greater than a preset increase value.
In this embodiment of the present invention, when the equalization capability judgment index of the battery pack equalization module satisfies at least one of the above conditions, it can be determined that the equalization effect is achieved, which specifically includes:
(1) the maximum generated monomer voltage difference is less than the preset voltage difference, delta U, of the battery packEqualization<u1Wherein the predetermined voltage difference u1The maximum pressure difference is required by the requirement or the technical protocol, if the maximum pressure difference is not required, the maximum pressure difference can be customized according to the performance of the battery, and the maximum pressure difference is generally required to be less than 30mV or 50 mV;
(2) the equalizing current is greater than the preset current, I, of the battery packEqualization>i1Wherein the preset current i1The setting can be carried out according to the requirements of the battery pack or technical protocols, and the setting can also be customized;
(3) the percentage of capacitance increase is greater than a predetermined increase value, TEqualization>t1Wherein the lifting value t is preset1Any value between 0% and 100% may be set according to the degree of freshness of the battery.
An embodiment of the present invention further provides a device for detecting a battery pack balancing module, including:
the charging and discharging control module is used for controlling the charging and discharging module to charge and discharge the battery pack to be detected so as to enable the battery pack to reach a target voltage state;
the first information acquisition module is used for acquiring first battery index information of the battery pack in the target voltage state after the equalization module is not added and is kept standing for a preset time, and acquiring second battery index information of the battery pack in the target voltage state after the equalization module is added and reaches the preset time;
the second information acquisition module is used for acquiring third battery index information after the equalization module is not added to perform multiple charge and discharge cycles on the battery pack in the target voltage state, and acquiring fourth battery index information after the equalization module is added to perform multiple charge and discharge cycles on the battery pack in the target voltage state;
and the analysis module is used for judging the balancing effect of the balancing module according to the first battery index information, the second battery index information, the third battery index information and the fourth battery index information.
Specifically, the target voltage state is: the method comprises the following steps that on the basis that the battery pack has a target charge value, a first charge value is discharged to a first preset number of batteries in the battery pack, and a second charge value is charged to a second preset number of batteries outside the first preset number of batteries in the battery pack.
Specifically, as shown in fig. 3, performing a plurality of charge and discharge cycles on the battery pack includes:
the battery pack is charged with constant current and then with constant voltage until the current is smaller than a preset current value or the voltage is smaller than a preset voltage value;
the battery pack is kept still for a preset time;
discharging the battery pack to the preset voltage value in a constant current manner;
and the battery pack stands for the preset time.
In this embodiment of the present invention, the preset current value may be set to 0.05 times of the rated charge-discharge current; the preset voltage value is generally the total cut-off voltage of the battery pack or the voltage-limiting protection voltage of the single battery; the preset time period is generally 30 min. The above charge and Discharge cycle process was repeated, and a cycle test of 100% DOD (Depth of Discharge) was performed until the capacity was stabilized.
Specifically, the determining, by the analysis module, the balancing effect of the balancing module according to the first battery index information, the second battery index information, the third battery index information, and the fourth battery index information includes:
when the first battery index information, the second battery index information, the third battery index information and the fourth battery index information are judged to meet at least one of the following conditions, determining that the balancing module has a balancing effect:
the voltage difference of the single battery is smaller than the preset voltage difference of the battery pack;
the equalizing current is greater than the preset current of the battery pack;
the capacitance increase percentage is greater than a preset increase value.
In this embodiment of the present invention, the detection system of the battery pack balancing module further includes the detection device, and the charge and discharge control module in the detection device communicates with the charge and discharge module in the detection system and controls the charge and discharge of the battery pack to be detected; a first information acquisition module and a second information acquisition module in the detection device are communicated with a battery index acquisition module and control the battery index acquisition module to acquire first battery index information, second battery index information, third battery index information and fourth battery index information; the upper computer in the detection system can contain a detection device for communication, work control and information display.
Taking an example that a battery pack to be detected in a detection system comprises 13 batteries, setting a BT2000 battery as a charging and discharging module in the detection system to charge and discharge the battery pack; the battery index acquisition module in the detection system is a 24-path direct current data acquisition module which comprises 12 paths of current acquisition (range: 0-5A, precision: 0.5% FS) and 12 paths of voltage acquisition (range: 0-5V, precision: 0.5% FS), and RS485 communication is adopted. Labview2010 is adopted to manufacture software of an upper computer, RS485 communication is supported, and the software is used for displaying, storing, current and voltage data. The method comprises the following specific steps:
the method comprises the following steps: the charging and discharging control module sends a signal for adjusting the consistency of the battery pack to be detected, and the charging and discharging module in the detection system charges and discharges the battery pack to be detected. The specific parameters are as follows: 2. 5, 8 and 11 single batteries have SOC of 50 percent; 1. 4, 7, 10 and 13 single batteries are discharged for 20 percent on the basis that the SOC of the battery pack is 50 percent; 3. 6, 9 and 12 single batteries are charged by 30 percent on the basis that the SOC of the battery pack is 50 percent;
step two: setting a battery pack to be detected to stand for 12 hours without adding a balancing module, and controlling a battery index acquisition module to acquire first battery index information by a first information acquisition module;
step three: setting an adding balancing module, allowing the battery pack to be detected to stand for 12 hours, and controlling a battery index acquisition module to acquire second battery index information by a first information acquisition module;
step four: the consistency of the battery pack is adjusted again in the same step I;
step five: setting a balancing module not to be added, controlling the charge and discharge module to perform cyclic charge and discharge on the battery pack to be detected for 5 to 7 times by the charge and discharge control module, and controlling the battery index acquisition module to acquire third battery index information by the second information acquisition module;
step six: and the charging and discharging control module controls the charging and discharging module to perform cyclic charging and discharging on the battery pack to be detected for 5 to 7 times, and the second information acquisition module controls the battery index acquisition module to acquire fourth battery index information.
The analysis module analyzes the data acquired by the battery index acquisition module in the second step to the sixth step, so that the improvement condition of the equalization module on the uniformity of the single voltage of the standing battery pack and the capacity improvement condition of the power battery pack after charging and discharging can be obtained, and the display results are shown in fig. 4 to 7.
From the above steps, the analysis module concludes:
(1) the equalizing module can balance the battery in the charging, discharging and standing processes.
(2) The equalizing module greatly improves the capacitance. As shown in fig. 7, the equalizing module increases the charge and discharge capacity of the battery pack from 4.6Ah to 8.3Ah, which is about T higherEqualization＝80％。
(3) The equalization module can improve the inconsistency of the single batteries, so that the voltage difference of the single batteries is smaller. Aiming at the group of batteries, the maximum monomer voltage difference can reach 0.1V when the discharge is finished, the duration is short, and the maximum monomer voltage difference delta U can be ensured for the rest of the batteriesEqualization<30mV。
(4) The balance current is larger and can reach IEqualization4A. As shown in fig. 8, the maximum equalization current can reach 4.2A, with a short duration. In the cyclic test after the capacity is stabilized, the equalizing current is onlyThe discharge end period is large and can reach 100 mA-300 mA, and the balance current can be ignored in the rest time.
Because the battery pack is an old battery pack which is used for multiple times, the balance current I is satisfied in three conditions of balance capacityEqualization>1A and percentage capacitance increase TEqualization>Can be used at 50%.
According to the conclusion (2) and the conclusion (4), the analysis module analyzes that the equalization module detects that the demand is met, and can adopt the method. While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (11)
1. A detection method for a battery pack equalization module is characterized by comprising the following steps:
controlling a charge-discharge module to charge and discharge a battery pack to be detected so as to enable the battery pack to reach a target voltage state;
acquiring first battery index information of the battery pack in the target voltage state after the balancing module is not added and is kept standing for a preset time, and acquiring second battery index information of the battery pack in the target voltage state after the balancing module is added and reaches the preset time;
acquiring third battery index information after the equalization module is not added to perform multiple charge-discharge cycles on the battery pack in the target voltage state, and acquiring fourth battery index information after the equalization module is added to perform multiple charge-discharge cycles on the battery pack in the target voltage state;
and judging the balancing effect of the balancing module according to the first battery index information, the second battery index information, the third battery index information and the fourth battery index information.
2. The method of claim 1, wherein the target voltage state is: the method comprises the following steps that on the basis that the battery pack has a target charge value, a first charge value is discharged to a first preset number of batteries in the battery pack, and a second charge value is charged to a second preset number of batteries outside the first preset number of batteries in the battery pack.
3. The method of claim 1, wherein performing a plurality of charge and discharge cycles on the battery pack comprises:
the battery pack is charged with constant current and then with constant voltage until the current is smaller than a preset current value or the voltage is smaller than a preset voltage value;
the battery pack is kept still for a preset time;
discharging the battery pack to the preset voltage value in a constant current manner;
and the battery pack stands for the preset time.
4. The method for detecting the battery pack balancing module according to claim 1, wherein the determining the balancing effect of the balancing module according to the first battery index information, the second battery index information, the third battery index information and the fourth battery index information includes:
when the first battery index information, the second battery index information, the third battery index information and the fourth battery index information are judged to meet at least one of the following conditions, determining that the balancing module has a balancing effect:
the voltage difference of the single battery is smaller than the preset voltage difference of the battery pack;
the equalizing current is greater than the preset current of the battery pack;
the capacitance increase percentage is greater than a preset increase value.
5. A detection apparatus for a battery pack equalization module, comprising:
the charging and discharging control module is used for controlling the charging and discharging module to charge and discharge the battery pack to be detected so as to enable the battery pack to reach a target voltage state;
the first information acquisition module is used for acquiring first battery index information of the battery pack in the target voltage state after the equalization module is not added and is kept standing for a preset time, and acquiring second battery index information of the battery pack in the target voltage state after the equalization module is added and reaches the preset time;
the second information acquisition module is used for acquiring third battery index information after the equalization module is not added to perform multiple charge and discharge cycles on the battery pack in the target voltage state, and acquiring fourth battery index information after the equalization module is added to perform multiple charge and discharge cycles on the battery pack in the target voltage state;
and the analysis module is used for judging the balancing effect of the balancing module according to the first battery index information, the second battery index information, the third battery index information and the fourth battery index information.
6. The apparatus for detecting a battery equalization module of claim 5,
the target voltage state is: the method comprises the following steps that on the basis that the battery pack has a target charge value, a first charge value is discharged to a first preset number of batteries in the battery pack, and a second charge value is charged to a second preset number of batteries outside the first preset number of batteries in the battery pack.
7. The apparatus for detecting the battery pack balancing module according to claim 5, wherein the plurality of charge/discharge cycles of the battery pack includes:
the battery pack is charged with constant current and then with constant voltage until the current is smaller than a preset current value or the voltage is smaller than a preset voltage value;
the battery pack is kept still for a preset time;
discharging the battery pack to the preset voltage value in a constant current manner;
and the battery pack stands for the preset time.
8. The apparatus for detecting the battery pack balancing module according to claim 5, wherein the analyzing module determines the balancing effect of the balancing module according to the first battery index information, the second battery index information, the third battery index information and the fourth battery index information, and comprises:
when the first battery index information, the second battery index information, the third battery index information and the fourth battery index information are judged to meet at least one of the following conditions, determining that the balancing module has a balancing effect:
the voltage difference of the single battery is smaller than the preset voltage difference of the battery pack;
the equalizing current is greater than the preset current of the battery pack;
the capacitance increase percentage is greater than a preset increase value.
9. A detection system for a battery pack equalization module, comprising a charge-discharge module and a detection device according to any one of claims 5 to 8.
10. The system of claim 9, further comprising a battery indicator collection module connected to the charge/discharge module and configured to collect the first battery indicator information, the second battery indicator information, the third battery indicator information, and the fourth battery indicator information.
11. The system for detecting the battery pack balancing module of claim 9, wherein the battery index collecting module comprises a voltage collecting module and/or a current collecting module.
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