CN203387282U - Box-level battery management system - Google Patents
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- CN203387282U CN203387282U CN201320529697.2U CN201320529697U CN203387282U CN 203387282 U CN203387282 U CN 203387282U CN 201320529697 U CN201320529697 U CN 201320529697U CN 203387282 U CN203387282 U CN 203387282U
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- ORKBYCQJWQBPFG-WOMZHKBXSA-N (8r,9s,10r,13s,14s,17r)-13-ethyl-17-ethynyl-17-hydroxy-1,2,6,7,8,9,10,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthren-3-one;(8r,9s,13s,14s,17r)-17-ethynyl-13-methyl-7,8,9,11,12,14,15,16-octahydro-6h-cyclopenta[a]phenanthrene-3,17-diol Chemical compound OC1=CC=C2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1.O=C1CC[C@@H]2[C@H]3CC[C@](CC)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 ORKBYCQJWQBPFG-WOMZHKBXSA-N 0.000 description 1
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Abstract
The embodiments of the application disclose a box-level battery management system, comprising multiple balance control chips and a box-level controller. The balance control chips are employed to conduct the balance control of any two adjacent single batteries. At the same time, the box-level controller is employed to monitor the work state of each balance control chip. Therefore, the electric quantity balance between any two adjacent single batteries is realized and the performance difference of any two adjacent single batteries is reduced; and moreover, the charging and discharging processes of all the single batteries in a whole battery set can be consistent, so that the service light of the battery set is prolonged. Accordingly, the problems of the prior art are solved.
Description
Technical Field
The application relates to the technical field of electric automobiles, in particular to a box-level battery management system.
Background
With the increasing prominence of resource and environmental problems, electric vehicles powered by vehicle-mounted power supplies are more and more widely applied. The lithium battery has the advantages of high energy density and volume density, high working voltage, no memory effect, low self-discharge, no environmental pollution and the like, and is an ideal power source of the electric automobile. However, the voltage of a single lithium battery is too low, and in order to obtain higher working voltage, the lithium batteries are generally required to be connected in series to form a battery pack for use.
The unit cells have dispersion of performance during the manufacturing process and non-uniformity of the internal environment of the battery pack during the use, so that the performance difference between the unit cells is gradually increased with the increase of the use time, and if no corresponding measures are taken to reduce the difference, the result of overcharge of some unit cells, overdischarge of some unit cells and overcharge and overdischarge of some unit cells is caused, which not only affects the service life of the battery and damages the battery, but also may generate a large amount of heat to cause combustion or explosion of the battery.
In the prior art, when batteries of an electric vehicle are used in series, due to the battery quality, the batch and other reasons and the damage of individual single batteries during the use process, the performance difference between the single batteries is gradually enlarged after a battery pack is used for a long time, and the difference is enlarged along with the time, so that the single batteries with small capacity are always in an overcharge and overdischarge state when a plurality of batteries in the battery pack are charged simultaneously, the service life attenuation is accelerated, and finally the whole service life of the battery pack is reduced.
Therefore, how to reduce the performance difference between the batteries in the battery pack and prolong the service life of the batteries becomes a technical problem which needs to be solved urgently by the technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
In view of this, an object of the present application is to provide a box-level battery management system, so as to solve the problems that performance differences exist between the single batteries in the existing battery pack, and the service life of the battery pack is too fast to decay.
In order to achieve the above purpose, the present application provides the following technical solutions:
a box-level battery management system is applied to a battery pack with a plurality of single batteries connected in series and comprises a plurality of balance control chip balance control boards for detecting battery state signals of the single batteries and carrying out balance control on the single batteries according to the battery state signals and a box-level controller for monitoring the working state of the balance control chips and communicating with the outside;
each balance control chip is connected with two adjacent single batteries in the battery pack, and each balance control chip is connected with the box level controller through a data line.
Preferably, the plurality of equalization control chips are integrated on a circuit board.
Preferably, the number of the single batteries in the battery pack is 24, and the number of the balance control chips is 23.
Preferably, the balance control chip comprises a charge amount control unit;
the charge amount control unit includes:
the charge quantity detection unit is used for detecting the charge quantities of the two adjacent single batteries;
a charge quantity judging unit for judging whether the charge quantities of the two adjacent single batteries are different according to the detection result of the charge quantity detecting unit; and the number of the first and second groups,
when the judgment result of the charge judging unit is yes, controlling the charge to be transferred from the single battery with high charge to the single battery with low charge until the charge of the two adjacent single batteries is the same; wherein,
the charge quantity judging unit is respectively connected with the charge quantity detecting unit and the electric quantity transfer control unit; the charge detection unit is respectively connected with the two adjacent single batteries; and the electric quantity transfer control unit is respectively connected with the two adjacent single batteries.
Preferably, the balance control chip further comprises a voltage converter connected between the two adjacent single batteries in series;
the electric power transfer control unit includes: the voltage converter comprises a calculation unit for determining the direction of the equalizing current, the magnitude of the equalizing current and the equalizing time according to the charge quantities of the two adjacent single batteries, and an execution unit for adjusting the transformation ratio of the voltage converter according to the direction of the equalizing current and the magnitude of the equalizing current and taking the equalizing time as the working time of the voltage converter.
Preferably, the balance control chip further comprises a current control unit;
the current control unit includes:
the current detection unit is used for detecting the current information of the two adjacent single batteries;
the overcurrent judging unit is used for judging whether at least one current of the two adjacent single batteries exceeds a preset current range according to the detection result of the current detecting unit; and the number of the first and second groups,
when the judgment result of the overcurrent judgment unit is yes, the overcurrent protection unit is used for carrying out overcurrent protection on the single battery with the current exceeding the range;
the overcurrent judging unit is respectively connected with the current detecting unit and the overcurrent protection unit.
Preferably, the balance control chip further comprises a voltage control unit;
the voltage control unit includes:
the voltage detection unit is used for detecting the voltage information of the two adjacent single batteries;
the overvoltage and undervoltage judging unit is used for judging whether at least one voltage of the two adjacent single batteries exceeds a preset voltage range according to the detection result of the voltage detecting unit; and the number of the first and second groups,
when the judgment result of the over-voltage and under-voltage judgment unit is yes, the over-voltage and under-voltage protection unit is used for performing over-voltage and under-voltage protection on the single battery with the voltage exceeding the range;
and the over-voltage and under-voltage judging unit is respectively connected with the voltage detection unit and the over-voltage and under-voltage protection unit.
Preferably, the balance control chip further comprises a temperature control unit;
the temperature control unit includes:
the temperature detection unit is used for detecting the temperature information of the two adjacent single batteries;
the over-under temperature judgment unit is used for judging whether the temperature of at least one of the two adjacent single batteries exceeds a preset temperature range according to the detection result of the temperature detection unit; and the number of the first and second groups,
when the judgment result of the over-under-temperature judgment unit is yes, the over-under-temperature protection unit is used for performing over-under-temperature protection on the single battery with the temperature exceeding the range;
the over-and-under-temperature judging unit is respectively connected with the temperature detecting unit and the over-and-under-temperature protecting unit.
Preferably, the bin level controller comprises:
the data storage unit is connected with the charge detection unit and used for storing the charge of each single battery;
the data output unit is connected with the charge detection unit and/or the data storage unit to output the charge of each single battery;
and the alarm unit is connected with the charge quantity judging unit and used for giving an alarm when the judgment result of the charge quantity judging unit is yes.
Preferably, the box-level battery management system further includes: and enabling the enabling unit of the balance control chip when the capacity of the battery pack is attenuated to a preset capacity.
Preferably, the box-level battery management system further includes: the low-voltage stabilizing unit is used for acquiring the electric energy of the single battery and supplying the electric energy to the balance control chip;
the input end of the low-voltage stabilizing unit is connected with at least one single battery, and the output end of the low-voltage stabilizing unit is connected with the balance control chip.
Preferably, the box-level battery management system further includes: and when the output voltage of the low-voltage stabilizing unit is lower than the preset lowest working voltage, the voltage locking unit of the balance control chip is closed.
According to the technical scheme, the box-level battery management system comprises a plurality of balance control chips and a box-level controller; carry out equalizing control to arbitrary two adjacent battery cells through equalizing control chip, simultaneously through the operating condition of every equalizing control chip of case level controller control, realized the electric quantity between arbitrary two adjacent battery cells balanced, reduced its performance difference, and then each battery cell in the whole group battery charge-discharge process can reach unanimity to the life of group battery has been prolonged, prior art's problem has been solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a block diagram of a box-level battery management system according to an embodiment of the present disclosure;
fig. 2 is a specific structural block diagram of an equalization control chip in the box-level battery management system according to the second embodiment of the present application;
fig. 3 is a specific structural block diagram of an equalization control chip in the box-level battery management system according to the third embodiment of the present application;
fig. 4 is a specific structural block diagram of an equalization control chip in the box-level battery management system according to the fourth embodiment of the present application;
fig. 5 is a block diagram of a box-level battery management system capable of controlling the start time of an equalization control chip according to the capacity of a battery pack according to a fifth embodiment of the present application;
fig. 6 is a block diagram illustrating a box-level battery management system without an external power supply and having a voltage locking function according to a sixth embodiment of the present disclosure.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The application provides a box-level battery management system to there is the performance difference between each battery cell in solving current group battery, the too fast problem of life decay of group battery.
The box-level battery management system provided by the embodiment of the application is applied to a battery pack with a plurality of series-connected single batteries, and the balance control among the plurality of single batteries is realized. Referring to fig. 1, the box-level battery management system provided in the first embodiment includes an equalization control chip 100 and a box-level controller 200. Each balance control chip 100 is connected with two adjacent single batteries in the battery pack, and each balance control chip 100 is connected with the box level controller 200 through a data line. The balance control chip 100 collects battery state information of two single batteries connected thereto, and performs balance control on the two single batteries according to the battery state information. The box-level controller 200 monitors the operation state of the equalization control chip 100 and communicates with the outside (e.g., an electric vehicle to which the above-described battery pack is applied).
According to the structure and the function, the balance control is carried out on any two adjacent single batteries through the balance control chip, the working state of each balance control chip is monitored through the box-level controller, the balance of electric quantity between any two adjacent single batteries is realized, the performance difference is reduced, and then the charging and discharging processes of each single battery in the whole battery pack can be consistent, so that the service life of the battery pack is prolonged, and the problems in the prior art are solved.
Specifically, each single battery is formed by connecting 3 battery cells in parallel. In each battery pack, the number of the single batteries constituting the battery pack is generally 24, and correspondingly, the number of the balance control chips is 23.
In addition, a plurality of balance control chips are integrated on a circuit board, so that the space occupation of the box-level battery management system is reduced, and the installation and the concentrated wiring are facilitated.
The specific structure of the equalization control chip 100 according to the embodiment of the present application is described in detail below with reference to fig. 2.
For convenience of description, in the embodiment of the present application, two adjacent single batteries connected to the same equalization control chip 100 in the battery pack are respectively denoted as a single battery a and a single battery B.
In the second embodiment shown in fig. 2, the box-level battery management system includes an equalization control chip 100 and a box-level controller 200. The balance control chip 100 mainly includes a charge control unit 110. The charge amount control unit 110 specifically includes a charge amount detection unit 111, a charge amount judgment unit 112, and a charge amount transfer control unit 113.
The charge amount judgment unit 112 is respectively connected with the charge amount detection unit 111 and the charge amount transfer control unit 113; the charge amount detection unit 111 is respectively connected with two adjacent single batteries; the power transfer control units 113 are also connected to the above-described adjacent two unit cells, respectively.
The working process/principle of the equalization control chip 100 in the above-mentioned box-level battery management system is explained as follows:
the charge amount detection unit 111 detects the charge amounts SOC of the single battery a and the single battery B; the charge amount determination unit 112 determines the charge amount SOC of the single battery a according to the detection result of the charge amount detection unit 111AAnd the charge amount SOC of the single battery BBWhether a difference exists; when the determination result of the charge amount determination unit 112 is yes (i.e. SOC)A≠SOCB) Then, the electric quantity transfer control unit 113 controls the electric charge to be transferred from the single battery with a large electric charge quantity SOC to the single battery with a small electric charge quantity SOC until the electric charge quantities of the two single batteries are the Same (SOC)A=SOCB）。
According to the structure and the working principle, the battery state signals of the two adjacent single batteries in the battery pack are detected through the balance control chip, and the two adjacent single batteries are subjected to balance control according to the battery state signals; particularly, when the charge quantities of the two adjacent single batteries are different, the charge quantity difference is eliminated through charge transfer, and when the charge quantities of any two adjacent single batteries are the same, the charge and discharge processes of the single batteries in the whole battery pack can be consistent, so that the performance difference between the single batteries is reduced or even eliminated, the service life of the battery pack is prolonged, and the problems in the prior art are solved.
In addition, after the charge quantity of the two adjacent single batteries is judged to be different, the single battery with the large charge quantity SOC is not discharged to reduce the charge quantity SOC, and relatively redundant charges of the single battery with the large charge quantity SOC are transferred to the single battery with the small charge quantity SOC, so that the waste of battery energy is avoided, the maximization of battery capacity is realized, and the service life of the battery pack is prolonged to the maximum extent.
Specifically, there are various ways to control the charge transfer between two single batteries, and a preferred implementation provided in the examples of the present application is shown in fig. 3.
In the third embodiment shown in fig. 3, the box-level battery management system includes the equalization control chip 100 and the box-level controller 200. The equalizing control chip 100 includes a charge amount control unit 110 and a voltage converter 120. The charge amount control unit 110 specifically includes a charge amount detection unit 111, a charge amount judgment unit 112, and a charge amount transfer control unit 113. More specifically, the power transfer control unit 113 includes a calculation unit 1131 and an execution unit 1132.
The connection relationship of the above units is: the input end of the charge detection unit 111 is respectively connected with two adjacent single batteries (respectively marked as a single battery a and a single battery B for convenience of description) in the battery pack, and the output end of the charge detection unit 111 is respectively connected with the output end of the charge judgment unit 112 and the output end of the calculation unit 1131; the output end of the charge detection unit 111 is connected with the enable end of the calculation unit 1131; the input end of the execution unit 1132 is connected to the output end of the calculation unit 1131, the output end of the execution unit 1132 is connected to the control end of the voltage converter 120, one non-control end of the voltage converter 120 is connected to the battery cell a, and the other non-control end is connected to the battery cell B.
In the battery pack, the operation principle of the balancing control chip 100 for performing balancing control on the single battery a and the single battery B is described as follows.
When the charge amount judging unit 112 judges the charge amount SOC of the single battery A detected by the charge amount detecting unit 111AAnd the charge SOC of the single battery BBAt a different time, an enable signal is sent to the enable of compute unit 1132.
After receiving the enable signal, the computing unit 1131 may determine the charge amount SOC of the battery cell aAAnd the charge SOC of the single battery BBDetermining the direction of the balance current, the magnitude of the balance current and the balance time; the balancing current direction is from the single battery with high charge capacity to the single battery with low charge capacity; the product of the magnitude of the balancing current and the balancing time is half of the difference between the two single batteries (namely | SOC)A-SOCB|/2）。
After receiving the calculation result of the calculating unit 1131, the executing unit 1132 starts the voltage converter 120 and starts timing, and simultaneously adjusts the transformation ratio of the voltage converter 120 so that the direction and the magnitude of the current flowing through the voltage converter 120 are the balanced current direction and the balanced current magnitude, respectively; when the counted time period reaches the average time period, the execution unit 1132 controls the voltage converter 120 to stop operating.
Suppose the transformation ratio of the voltage converter 120 is UA:UB（UAIndicates the voltage, U, at the end of the voltage converter 120 connected to the cell ABVoltage at one end of voltage converter 120 connected to cell B), if SOCA＞SOCBExecution unit 1132 adjusts the conversion ratio U of voltage converter 120A:UB>1, making the balance current flow from the single battery A to the single battery B. The magnitude of the balance current and the balance time are mutually influenced, so that the balance current can be determined according to the actual balance requirement; for example, if the practical application only requires the equalization time not to exceed t0Then the equalization time can be set to t (t is more than 0 and less than or equal to t)0) The corresponding equalizing current magnitude I = | SOCA-SOCBI/(2 t); if the balance time is required not to exceed t in practical application0And the equalizing current does not exceed I0The equalizing current can be set to be I (I is more than 0 and less than or equal to I)0) Corresponding equalization time t' = | SOCA-SOCB|/(2I)≤t0。
According to the embodiment, the voltage converter is controlled to start and stop, the transformation ratio is adjusted, quantitative charge transfer between two adjacent single batteries is achieved, the difference of the charge quantity between the two single batteries is eliminated, waste of battery energy is avoided, maximization of battery capacity is achieved, further the charge and discharge processes of the single batteries in the whole battery pack are consistent, performance difference between the single batteries is reduced or even eliminated, the service life of the battery pack is prolonged to the maximum extent, and the problems in the prior art are solved.
In the research process, the applicant finds that the phenomena of overhigh/low current, voltage or temperature of the single batteries in the battery pack can also occur in the charging and discharging processes, and the phenomena can cause certain damage to the single batteries, cause performance difference among the single batteries and shorten the service life of the single batteries. Therefore, it is necessary to take certain measures to eliminate the above phenomena, so as to achieve better battery equalization control effect.
In view of the above reasons, the fourth and third embodiments of the present application provide another box-level battery management system, which includes an equalization control chip 100 and a box-level controller 200, as shown in fig. 4. The balance control chip 100 includes a charge amount control unit 110, a voltage converter 120, and a current control unit 130.
The charge amount control unit 110 specifically includes a charge amount detection unit 111, a charge amount judgment unit 112, and a charge amount transfer control unit 113. More specifically, the power transfer control unit 113 includes a calculation unit and an execution unit. In this embodiment, the connection relationship and the operation principle between the components of the charge detection unit 110 can refer to the above descriptions, and are not described herein again.
The current control unit 130 includes a current detection unit 131, an overcurrent determination unit 132, and an overcurrent protection unit 133. The overcurrent determination unit 132 is connected to the current detection unit 131 and the overcurrent protection unit 133, respectively.
The current detection unit 131 is respectively connected to the single battery A and the single battery B, and is used for detecting the current I of the single battery AAAnd current I of cell BB(ii) a The overcurrent determination unit 132 determines whether at least one of the currents of the single battery a and the single battery B exceeds a preset current range according to the detection result of the current detection unit 131; when the determination result of the overcurrent determination unit 132 is yes, the overcurrent protection unit 133 performs overcurrent protection on the unit cell whose current exceeds the range. For example, if the overcurrent determination unit 132 determines the current I of the battery cell aAExceeding a predetermined maximum current value ImaxIf yes, the overcurrent protection unit 133 performs overcurrent protection on the single battery a; if the over-current determination unit 132 determines the listCurrent I of the body cell BBExceeding a predetermined maximum current value ImaxThen, the overcurrent protection unit 1330 performs overcurrent protection on the battery cell B. The overcurrent protection mode adopted in this embodiment is a Cycle by Cycle (Cycle by Cycle) current control mode. The embodiment takes protective measures only when the current of the single battery is overlarge; in fact, if there is an application requirement, corresponding protective measures can be taken when the current of the single battery is too low, and the current is recovered to a normal value.
In addition, the current of the single battery collected by the current detection unit 131 includes both the charging current during the charging process of the single battery and the discharging current during the discharging process of the single battery, that is, the current detection unit simultaneously performs overcurrent protection on the charging process and the discharging process of the single battery.
Still referring to fig. 4, in the box-level battery management system provided in the embodiment of the present application, the balancing control chip 100 further includes a voltage control unit 140.
Specifically, the voltage control unit 140 includes a voltage detection unit 141, an over/under voltage determination unit 142, and an over/under voltage protection unit 143. The over/under voltage determining unit 142 is connected to the voltage detecting unit 141 and the over/under voltage protecting unit 143, respectively.
The voltage detection unit 141 is respectively connected to the single battery A and the single battery B, and is used for detecting the voltage U of the single battery AAAnd voltage U of battery cell BB(ii) a The overvoltage/undervoltage judging unit 142 judges whether at least one of the voltages of the single battery a and the single battery B exceeds a preset voltage range according to the detection result of the voltage detecting unit 141; if yes, the over-voltage and under-voltage protection unit 143 performs over-voltage and under-voltage protection on the single battery with the voltage exceeding the range. For example, if the under-voltage determination unit 142 determines the voltage U of the battery cell AAOut of a predetermined voltage range (specifically U)ALess than a predetermined minimum voltage value UminOr, UAGreater than a predetermined maximum voltage value Umax) If so, the overvoltage and undervoltage protection unit 143 performs overvoltage and undervoltage protection on the single battery a; correspondingly, if the voltage of the battery cell B is over-voltage or under-voltage, the determining unit 142 determines the voltage U of the battery cell BBOut of a predetermined voltage range (specifically U)BLess than a predetermined minimum voltage value UminOr, UBGreater than a predetermined maximum voltage value Umax) Then, the overvoltage/undervoltage protection unit 143 performs overvoltage/undervoltage protection on the battery cell B. There are various specific ways of the over-voltage and under-voltage protection, and a preferred way of the embodiment of the present application is to suspend the control of the voltage converter 120 by the power transfer control unit 113 until the voltage is restored to the preset voltage range.
In addition, to prevent the overcharge phenomenon, the voltage control unit 140 further includes a charging mode control unit 144 for setting a charging mode of the battery pack according to a detection result of the voltage detection unit 141 during the charging process; that is, in the initial charging period, when the voltage detected by the voltage detection unit 141 is small, the charging mode control unit 144 sets the battery pack to perform charging in a high-power serial charging mode, so as to improve the charging speed and ensure the charging efficiency; at the end of charging, when the voltage detected by the voltage detecting unit 141 is large, the charging mode control unit 144 sets the battery pack to be charged with a low power in a parallel charging mode to slow down the charging speed and prevent overcharging. Therefore, the charging mode control unit 144 controls the battery pack to switch between the two charging modes, so that the charging efficiency and the charging protection are unified.
Still referring to fig. 4, in the box-level battery management system provided in the embodiment of the present application, the balancing control chip 100 further includes a temperature control unit 150.
Specifically, the temperature control unit 150 includes a temperature detection unit 151, an over-under temperature determination unit 152, and an over-under temperature protection unit 153. The over/under temperature determining unit 152 is connected to the temperature detecting unit 151 and the over/under temperature protecting unit 153, respectively.
The temperature detection unit 1510 is connected to the single battery a and the single battery B, respectively, and is used for detecting the temperature T of the single battery aAAnd temperature T of battery cell BB(ii) a The over-and-under-temperature judging unit 152 judges whether the temperature of at least one of the single battery a and the single battery B exceeds a preset temperature range according to the detection result of the temperature detecting unit 151; if so, the temperature is over-lowThe protection unit 153 performs over-under-temperature protection on the single battery with the temperature exceeding the range, so that the temperature of the single battery is restored to be within the preset temperature range. For example, if the over-under temperature determination unit 152 determines the temperature T of the battery cell aAOut of a predetermined temperature range (in particular T)AGreater than a predetermined maximum temperature TmaxOr, alternatively, TALess than a predetermined minimum temperature Tmin) If so, the over-and-under-temperature protection unit 153 performs over-and-under-temperature protection on the single battery a; accordingly, if the over-temperature and under-temperature determination unit 152 determines the temperature T of the battery cell BBOut of a predetermined temperature range (in particular T)BGreater than a predetermined maximum temperature TmaxOr, alternatively, TBLess than a predetermined minimum temperature Tmin) The over-under temperature protection unit 153 performs over-under temperature protection on the unit battery B. The over-and-under-temperature protection may be implemented in various ways, and in the embodiment of the present application, it is preferable that the over-and-under-temperature protection unit 153 controls the voltage converter 120 to stop working when the temperature exceeds the preset temperature range, and the over-and-under-temperature protection unit 153 restarts the voltage converter 120 when the temperature returns to the preset temperature range.
In practical applications, the equalization control chip may include the current control unit, the voltage control unit, and the temperature control unit at the same time, or may include only one or two of them.
According to the structure and the working principle, the single battery in the battery pack is subjected to overcurrent protection through the current control unit, the single battery is subjected to undervoltage protection through the voltage control unit, the single battery is subjected to undertemperature protection through the temperature control unit, the phenomenon that the current, the voltage or the temperature are too high/low is avoided, the influence of the single battery on the performance of the single battery is eliminated, the battery balance control effect is optimized to a certain extent, and the service life of the single battery is prolonged. Meanwhile, the battery pack is controlled to be switched under two charging modes through the charging mode control unit, so that the unification of charging efficiency and charging protection is realized.
Further, in the box-level battery management system according to the above embodiment, the box-level controller includes at least one of a data storage unit, a data output unit, and an alarm unit.
The data storage unit is connected with at least one of the charge detection unit, the current detection unit, the voltage detection unit and the temperature detection unit and is used for storing the state information of each single battery; the state information includes the detection results of the respective detection units connected to the data storage unit, such as the charge amount, current, voltage, or temperature of the unit cells.
The data output unit is used for outputting the state information of each single battery, and the data output unit can be directly connected with the data storage unit so as to directly read the state information of the single batteries stored in the data storage unit and output the state information; and the data output unit can be connected with the detection unit corresponding to the state information needing to be output, and if the charge quantity of the single battery only needs to be output, the data output unit is connected with the charge quantity detection unit.
The alarm unit is respectively connected with the charge quantity judging unit, the overcurrent judging unit, the overvoltage/undervoltage judging unit and the over/undertemperature judging unit and is used for giving corresponding alarm when the judging result of any judging unit is yes. For example, the alarm mode may be set as follows: when the judgment result of the charge quantity judgment unit is yes, a buzzing alarm is carried out; and when the judgment result of the over-voltage and under-voltage judgment unit is yes, the lighting alarm is carried out, and the like.
In order to reduce power consumption, the battery pack provided by the fifth embodiment of the application provides a box-level battery management system, and the equalization control chip can be controlled to be started timely according to the working state of the battery pack. As shown in fig. 5, the box-level battery management system battery pack includes an equalization control chip 100, a box-level controller 200, and an enabling unit 300. When the battery pack is in the initial use stage, the equalization control is not required, so the equalization control chip 100 is not activated to reduce power consumption, and only the enable unit 300 detects the capacity of the battery pack; as the service time of the battery increases, the capacity of the battery pack gradually decreases, and when the capacity of the battery pack detected by the enabling unit 300 decreases to a preset threshold value (typically 80% of the initial capacity), the enabling unit 300 triggers the balancing control chip 100, so that the balancing control chip 100 starts balancing control of the single batteries in the battery pack.
In the battery pack of the box-level battery management system provided by the embodiment, the working voltage of the balance control chip can be provided by an external power supply. In order to reduce the space occupation of the battery pack and facilitate packaging, the battery pack provided by the sixth embodiment of the application provides a box-level battery management system, and power is taken from a controlled battery pack of the battery pack to be supplied to a balance control chip. As shown in fig. 6, the box-level battery management system battery pack includes an equalization control chip 100, a box-level controller 200, and a low-voltage regulator unit 400. The balance control chip 100 performs balance control on two adjacent single batteries in the battery pack; the input end of the low-voltage stabilizing unit 400 is connected with at least one single battery, the output end of the low-voltage stabilizing unit 400 is connected with the balance control chip 100, the low-voltage stabilizing unit 400 gets electricity from the single battery connected with the low-voltage stabilizing unit and converts the electricity into the working voltage of the balance control chip 100, so that an independent external power supply is not needed, the space occupation amount of the battery pack is reduced, the independence of the battery pack of the box-level battery management system is improved, and the application is facilitated.
Specifically, the low voltage regulator unit may employ a low voltage linear regulator LDO.
Further, still referring to fig. 6, the box-level battery management system provided in the embodiment of the present application further includes a voltage locking unit 500. The voltage locking unit 500 is connected to the low voltage regulator unit 400 and the balancing control chip 100, and is configured to detect an output voltage of the low voltage regulator unit 400, and when the output voltage is lower than a minimum working voltage (generally 3.2V) of the balancing control chip 100, control the balancing control chip 100 to enter a sleep state, and stop balancing control of the battery pack, so as to prevent malfunction of the balancing control chip 100.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (12)
1. A box-level battery management system is applied to a battery pack with a plurality of single batteries connected in series; the single battery balancing control system is characterized by comprising a plurality of balancing control chip balancing control boards for detecting battery state signals of the single batteries and carrying out balancing control on the single batteries according to the battery state signals, and a box-level controller for monitoring the working state of the balancing control chips and communicating with the outside;
each balance control chip is connected with two adjacent single batteries in the battery pack, and each balance control chip is connected with the box level controller through a data line.
2. The box-level battery management system according to claim 1, wherein the plurality of equalization control chips are integrated on a circuit board.
3. The box-level battery management system according to claim 1, wherein the number of the single batteries in the battery pack is 24, and the number of the equalization control chips is 23.
4. The box-level battery management system according to any one of claims 1 to 3, wherein the equalization control chip comprises a charge amount control unit;
the charge amount control unit includes:
the charge quantity detection unit is used for detecting the charge quantities of the two adjacent single batteries;
a charge quantity judging unit for judging whether the charge quantities of the two adjacent single batteries are different according to the detection result of the charge quantity detecting unit; and the number of the first and second groups,
when the judgment result of the charge judging unit is yes, controlling the charge to be transferred from the single battery with high charge to the single battery with low charge until the charge of the two adjacent single batteries is the same; wherein,
the charge quantity judging unit is respectively connected with the charge quantity detecting unit and the electric quantity transfer control unit; the charge detection unit is respectively connected with the two adjacent single batteries; and the electric quantity transfer control unit is respectively connected with the two adjacent single batteries.
5. The box-level battery management system according to claim 4, wherein the equalization control chip further comprises a voltage converter connected in series between the two adjacent single batteries;
the electric power transfer control unit includes: the voltage converter comprises a calculation unit for determining the direction of the equalizing current, the magnitude of the equalizing current and the equalizing time according to the charge quantities of the two adjacent single batteries, and an execution unit for adjusting the transformation ratio of the voltage converter according to the direction of the equalizing current and the magnitude of the equalizing current and taking the equalizing time as the working time of the voltage converter.
6. The box-level battery management system according to claim 4, wherein the equalization control chip further comprises a current control unit;
the current control unit includes:
the current detection unit is used for detecting the current information of the two adjacent single batteries;
the overcurrent judging unit is used for judging whether at least one current of the two adjacent single batteries exceeds a preset current range according to the detection result of the current detecting unit; and the number of the first and second groups,
when the judgment result of the overcurrent judgment unit is yes, the overcurrent protection unit is used for carrying out overcurrent protection on the single battery with the current exceeding the range;
the overcurrent judging unit is respectively connected with the current detecting unit and the overcurrent protection unit.
7. The box-level battery management system according to claim 4, wherein the equalization control chip further comprises a voltage control unit;
the voltage control unit includes:
the voltage detection unit is used for detecting the voltage information of the two adjacent single batteries;
the overvoltage and undervoltage judging unit is used for judging whether at least one voltage of the two adjacent single batteries exceeds a preset voltage range according to the detection result of the voltage detecting unit; and the number of the first and second groups,
when the judgment result of the over-voltage and under-voltage judgment unit is yes, the over-voltage and under-voltage protection unit is used for performing over-voltage and under-voltage protection on the single battery with the voltage exceeding the range;
and the over-voltage and under-voltage judging unit is respectively connected with the voltage detection unit and the over-voltage and under-voltage protection unit.
8. The box-level battery management system according to claim 4, wherein the equalization control chip further comprises a temperature control unit;
the temperature control unit includes:
the temperature detection unit is used for detecting the temperature information of the two adjacent single batteries;
the over-under temperature judgment unit is used for judging whether the temperature of at least one of the two adjacent single batteries exceeds a preset temperature range according to the detection result of the temperature detection unit; and the number of the first and second groups,
when the judgment result of the over-under-temperature judgment unit is yes, the over-under-temperature protection unit is used for performing over-under-temperature protection on the single battery with the temperature exceeding the range;
the over-and-under-temperature judging unit is respectively connected with the temperature detecting unit and the over-and-under-temperature protecting unit.
9. The bin-level battery management system according to claim 4, wherein the bin-level controller comprises:
the data storage unit is connected with the charge detection unit and used for storing the charge of each single battery;
the data output unit is connected with the charge detection unit and/or the data storage unit to output the charge of each single battery;
and the alarm unit is connected with the charge quantity judging unit and used for giving an alarm when the judgment result of the charge quantity judging unit is yes.
10. The box-level battery management system according to any one of claims 1 to 3, further comprising: and enabling the enabling unit of the balance control chip when the capacity of the battery pack is attenuated to a preset capacity.
11. The box-level battery management system according to any one of claims 1 to 3, further comprising: the low-voltage stabilizing unit is used for acquiring the electric energy of the single battery and supplying the electric energy to the balance control chip;
the input end of the low-voltage stabilizing unit is connected with at least one single battery, and the output end of the low-voltage stabilizing unit is connected with the balance control chip.
12. The box-level battery management system of claim 11, further comprising: and when the output voltage of the low-voltage stabilizing unit is lower than the preset lowest working voltage, the voltage locking unit of the balance control chip is closed.
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| CN201320529697.2U CN203387282U (en) | 2013-08-28 | 2013-08-28 | Box-level battery management system |
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| CN201320529697.2U CN203387282U (en) | 2013-08-28 | 2013-08-28 | Box-level battery management system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426179A (en) * | 2013-08-28 | 2015-03-18 | 国家电网公司 | Box-level battery management system |
| CN105429227A (en) * | 2015-12-16 | 2016-03-23 | 浙江大学 | Battery management and control system for underwater vehicle |
| CN107834620A (en) * | 2017-09-30 | 2018-03-23 | 浙江大学 | A kind of lithium battery group charging method of multiobjective optimal control |
-
2013
- 2013-08-28 CN CN201320529697.2U patent/CN203387282U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426179A (en) * | 2013-08-28 | 2015-03-18 | 国家电网公司 | Box-level battery management system |
| CN104426179B (en) * | 2013-08-28 | 2017-02-22 | 国家电网公司 | Box-level battery management system |
| CN105429227A (en) * | 2015-12-16 | 2016-03-23 | 浙江大学 | Battery management and control system for underwater vehicle |
| CN107834620A (en) * | 2017-09-30 | 2018-03-23 | 浙江大学 | A kind of lithium battery group charging method of multiobjective optimal control |
| CN107834620B (en) * | 2017-09-30 | 2020-05-29 | 浙江大学 | Multi-objective optimization control lithium battery pack charging method |
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