CN209987775U - Battery pack voltage-sharing device and battery pack system - Google Patents
Battery pack voltage-sharing device and battery pack system Download PDFInfo
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- CN209987775U CN209987775U CN201920658246.6U CN201920658246U CN209987775U CN 209987775 U CN209987775 U CN 209987775U CN 201920658246 U CN201920658246 U CN 201920658246U CN 209987775 U CN209987775 U CN 209987775U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The utility model relates to a group battery voltage-sharing device and group battery system are provided with voltage-sharing module among the group battery voltage-sharing device, and voltage-sharing module is equipped with voltage-sharing switch including the parallelly connected voltage-sharing switch branch road and the voltage-sharing resistance branch road that set up, voltage-sharing switch branch road, voltage-sharing resistance branch road on be provided with voltage-sharing resistance and with the voltage-sharing indicator of voltage-sharing resistance coupling setting, when there is pressure differential between the battery module, control voltage-sharing switch disconnection, drop into voltage-sharing resistance. When voltage sharing is not finished, certain voltage exists at the two ends of the voltage sharing indicator, the voltage sharing indicator outputs an indication signal, when voltage sharing is finished, the pressure difference is very small or no, at the moment, the voltage at the two ends of the voltage sharing indicator is very small or no voltage exists, and then the voltage sharing indicator does not output the indication signal, so that a worker can visually know whether the circulating current is eliminated through the voltage sharing indicator.
Description
Technical Field
The utility model relates to a group battery voltage-sharing device and battery system.
Background
New energy sanitation vehicles applied to the market are gradually increased, and especially pure electric sanitation vehicles gradually replace traditional sanitation vehicles. Heavy sanitation vehicles have harsh requirements on the electric quantity of a battery system and need to bear more electric quantity so as to meet the operation requirement of 8 hours a day. However, the copper bar welding capacity and the overcurrent capacity are limited by the scheme of first parallel connection and then serial connection, the requirement of high capacity (more than 300Ah) cannot be met, the scheme of first serial connection and then parallel connection is only used, and the consistency and the stability of the parallel battery system and the maturity of the current market application need to be considered. The parallel battery systems in the existing market are all in parallel connection with direct branches, and if the pressure difference between the branches is too large (larger than 5V), the circulation effect of the branches can cause certain influence on the service life and consistency of the battery systems.
The chinese patent application publication No. CN106953391A discloses a parallel charging/discharging device for a battery pack, which includes a plurality of battery branches connected in parallel, wherein a battery module and a balancing module are disposed on the battery branches, and the balancing module is formed by connecting a balancing switch and a balancing resistor in parallel, and is similar to a soft start circuit. When a pressure difference exists between two battery modules, a circulation current exists between the two battery modules, then the balance switches in the balance modules corresponding to the two battery modules are disconnected, balance resistors are put into the balance switches, the pressure difference is consumed through the balance resistors, the balance of the battery modules is realized, and the circulation current is avoided. Although the device can eliminate the circulation, the device cannot output a visual indication signal of whether the pressure difference disappears (namely whether the circulation is eliminated or whether the pressure equalization is finished), so that a worker can visually know whether the circulation is eliminated or not, and the instantaneity is poor.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a group battery voltage-sharing device for solve the problem that whether the staff can't learn the circulation directly perceivedly and has eliminated. The utility model provides a group battery system simultaneously for solve the problem that whether the circulation among the staff can't learn current battery system directly perceivedly has eliminated.
In order to achieve the above object, the present invention provides a voltage equalizing device for battery pack, including:
at least two positive electrode interfaces for connecting the positive electrodes of the corresponding battery modules;
a master positive interface;
at least two negative electrode interfaces which correspond to the positive electrode interfaces and are used for connecting the negative electrodes of the corresponding battery modules; and
a total negative interface;
each positive electrode interface is connected with the total positive interface through a corresponding positive electrode connecting circuit, and each negative electrode interface is connected with the total negative interface through a corresponding negative electrode connecting circuit; the voltage-sharing module is connected in series with at least one connecting line in each positive connecting line and each negative connecting line and comprises a voltage-sharing switch, the voltage-sharing switch is connected in series with the corresponding connecting line, the voltage-sharing switch is connected in parallel with a voltage-sharing resistor branch, a voltage-sharing indicator which is provided with a voltage-sharing resistor and is coupled with the voltage-sharing resistor is arranged on the voltage-sharing resistor branch, the voltage-sharing indicator is used for outputting an indicating signal when the voltage at two ends of the voltage-sharing indicator is greater than a pressure difference set value, and otherwise, the indicating signal is not output.
When there is pressure difference between the battery module with the voltage-sharing module and other battery modules, namely there is circulation, control the disconnection of the voltage-sharing switch, throw in the voltage-sharing resistor, consume the pressure difference through the voltage-sharing resistor, promote the consistency between the battery modules, and, when the voltage-sharing is not finished, there is certain voltage at both ends of the voltage-sharing indicator, the voltage-sharing indicator outputs an indication signal, when the voltage-sharing is finished, the pressure difference between the battery modules is very little or there is no pressure difference, at this moment, the voltage at both ends of the voltage-sharing indicator is very little or there is no voltage, then, the voltage-sharing indicator does not output an indication signal, therefore, the staff can know whether the circulation is eliminated through the voltage-sharing indicator directly perceivedly, and can acquire the circulation immediately at the moment of finishing, promote the instantaneity.
Further, in order to output a more intuitive indication signal, the voltage-sharing indicator is an optical/acoustic indication signal voltage-sharing indication unit capable of outputting an optical and/or acoustic indication signal.
Further, in order to realize voltage sharing in two directions, the light/sound indicating signal voltage sharing indicating unit is two light emitting diodes which are reversely arranged in parallel.
Further, in order to improve the operation reliability of the voltage-sharing indicator, the voltage-sharing indicator is connected with the voltage-sharing resistor in parallel.
Furthermore, in order to ensure that the voltage-sharing indicator works in a rated working interval, a current-limiting resistor is also connected in series on a line on which the voltage-sharing indicator is arranged.
The utility model also provides a group battery system, include:
at least two battery modules;
a master positive interface; and
a total negative interface;
the positive electrode of each battery module is connected with the total positive interface through a corresponding positive electrode connecting circuit, and the negative electrode of each battery module is connected with the total negative interface through a corresponding negative electrode connecting circuit; the voltage-sharing module is connected in series with at least one connecting line in each positive connecting line and each negative connecting line and comprises a voltage-sharing switch, the voltage-sharing switch is connected in series with the corresponding connecting line, the voltage-sharing switch is connected in parallel with a voltage-sharing resistor branch, a voltage-sharing indicator which is provided with a voltage-sharing resistor and is coupled with the voltage-sharing resistor is arranged on the voltage-sharing resistor branch, the voltage-sharing indicator is used for outputting an indicating signal when the voltage at two ends of the voltage-sharing indicator is greater than a pressure difference set value, and otherwise, the indicating signal is not output.
When there is pressure difference between the battery module with the voltage-sharing module and other battery modules, namely there is circulation, control the disconnection of the voltage-sharing switch, throw in the voltage-sharing resistor, consume the pressure difference through the voltage-sharing resistor, promote the consistency between the battery modules, and, when the voltage-sharing is not finished, there is certain voltage at both ends of the voltage-sharing indicator, the voltage-sharing indicator outputs an indication signal, when the voltage-sharing is finished, the pressure difference between the battery modules is very little or there is no pressure difference, at this moment, the voltage at both ends of the voltage-sharing indicator is very little or there is no voltage, then, the voltage-sharing indicator does not output an indication signal, therefore, the staff can know whether the circulation is eliminated through the voltage-sharing indicator directly perceivedly, and can acquire the circulation immediately at the moment of finishing, promote the instantaneity.
Further, in order to output a more intuitive indication signal, the voltage-sharing indicator is an optical/acoustic indication signal voltage-sharing indication unit capable of outputting an optical and/or acoustic indication signal.
Further, in order to realize voltage sharing in two directions, the light/sound indicating signal voltage sharing indicating unit is two light emitting diodes which are reversely arranged in parallel.
Further, in order to improve the operation reliability of the voltage-sharing indicator, the voltage-sharing indicator is connected with the voltage-sharing resistor in parallel.
Furthermore, in order to ensure that the voltage-sharing indicator works in a rated working interval, a current-limiting resistor is also connected in series on a line on which the voltage-sharing indicator is arranged.
Drawings
Fig. 1 is a specific circuit structure diagram of the battery voltage equalizing device provided by the present invention.
Detailed Description
Battery system embodiment:
the present embodiment provides a battery pack system, which is not limited to be applied to a vehicle, such as a pure electric vehicle or a hybrid electric vehicle, but can be applied to other occasions, such as a backup power source of a power supply system.
The battery system comprises two major parts: battery module part and group battery voltage-sharing device. The battery module part comprises at least two battery modules, and the specific number is determined by the power requirement of the battery pack system.
The battery pack voltage-sharing device comprises a total positive interface and at least two positive interfaces, wherein the positive interfaces correspond to the battery modules one to one, and each positive interface is connected with the positive electrode of the corresponding battery module. Then, the number of positive electrode interfaces is equal to the number of battery modules. Each positive electrode interface is connected with the main positive interface through a corresponding positive electrode connecting circuit. Correspondingly, the battery pack voltage-sharing device further comprises a total negative interface and at least two negative interfaces, the number of the negative interfaces is equal to that of the positive interfaces, and each negative interface corresponds to each positive interface and is used for being connected with the negative electrode of the corresponding battery module. Each negative electrode interface is connected with the total negative interface through a corresponding negative electrode connecting circuit.
At least one of the positive connecting circuits and the negative connecting circuits is provided with a voltage-sharing module in series. When only one connecting line is provided with the voltage-sharing module in series, the voltage-sharing module can be arranged on the positive connecting line or the negative connecting line; when being equipped with voltage-sharing module in cluster on two at least connecting lines, when group battery voltage-sharing device includes two at least voltage-sharing modules promptly, these voltage-sharing modules can all set up on the anodal connecting line of difference, also can all set up on the negative pole connecting line of difference, can also set up on anodal interconnecting link and the negative pole connecting line of difference. Moreover, as long as there is a connection line on which the voltage-sharing module is serially connected, voltage sharing between the battery module and any other battery module can be realized, and of course, the more the number of the connection lines serially connected with the voltage-sharing module is, the more the number of the battery modules capable of realizing voltage sharing is, and more choices are available.
Following taking two battery modules as an example, then, group battery voltage sharing device includes two positive pole interfaces, two positive connecting lines, two negative pole interfaces and two negative connecting lines, and moreover, group battery voltage sharing device includes two voltage sharing modules, and these two voltage sharing modules set up respectively on two positive connecting lines. As shown in fig. 1, the two battery modules are an a-branch battery module and a B-branch battery module, the two corresponding positive interfaces are an a-branch battery module positive interface and a B-branch battery module positive interface, and the two corresponding positive connecting lines are an a-branch positive connecting line and a B-branch positive connecting line. The voltage equalizing module on the A branch positive electrode connecting line comprises a voltage equalizing switch, wherein the voltage equalizing switch takes an MSD maintenance switch M1 as an example, and the specification of the MSD maintenance switch M1 is miniMSD-350A. The MSD maintenance switch M1 is serially arranged on the positive connecting line of the branch A and is arranged in parallel with the voltage-sharing resistor branch, the voltage-sharing resistor branch comprises two lines which are arranged in parallel, a voltage-sharing resistor R11 is serially arranged on the first line, the specification of the voltage-sharing resistor R11 is 100R100W, a current-limiting resistor R12 and a light-emitting diode unit D1 are serially arranged on the second line, and the light-emitting diode unit D1 is composed of two light-emitting diodes which are reversely connected in parallel. The current limiting resistor R12 is used to operate the two light emitting diodes in the light emitting diode unit D1 within the rated operating range, but of course, the current limiting resistor R12 may not be provided unless the two light emitting diodes can be operated within the rated operating range by other components such as the current limiting resistor R12. And the structure of the voltage-sharing module on the B branch positive electrode connecting line is the same as that of the voltage-sharing module on the A branch positive electrode connecting line, wherein the connection relation of the MSD maintenance switch M2, the voltage-sharing resistor R21, the current-limiting resistor R22 and the light-emitting diode unit D2 is the same as that of the voltage-sharing module on the A branch positive electrode connecting line, and the specifications of the MSD maintenance switch M2 and the voltage-sharing resistor R21 are also the same as that of the voltage-sharing module on the A branch positive electrode connecting line, and are not specifically described here.
The two negative electrode interfaces correspond to the negative electrode interface of the A branch battery module and the negative electrode interface of the B branch battery module in fig. 1, the negative electrode interface of the A branch battery module is connected with the total negative interface through the negative electrode connecting circuit of the A branch, and the negative electrode interface of the B branch battery module is connected with the total negative interface through the negative electrode connecting circuit of the B branch.
In addition, the voltage equalizing device of the battery pack further comprises a positive pole collecting circuit and a negative pole collecting circuit, as shown in fig. 1, the positive pole connecting circuit of the branch A and the positive pole connecting circuit of the branch B are connected with one end of the positive pole collecting circuit, the other end of the positive pole collecting circuit is connected with a main positive interface, a main positive relay K1 is connected on the positive pole collecting circuit in series, an MSD maintenance switch M3 is connected on the positive pole collecting circuit in series, the specification is MSD-400A, and an internal copper bar is connected on the positive pole collecting circuit in series. The one end that the negative pole was gathered to A branch road negative pole interconnecting link and B branch road negative pole interconnecting link connection negative pole, the total negative interface is connected to the other end that the negative pole was gathered the circuit, and the negative pole is gathered and is equipped with total negative relay K2 on the road is concatenated to be equipped with.
Further, a hall sensor T1 is connected in series to the negative bus line, and a shunt (i.e., a current sensor) T2 is connected in series to the negative connection line of the a branch.
The battery pack system provided by the embodiment is a high-electric-quantity and high-capacity system, the electric quantity is about 300kWh, and the system capacity is more than 500Ah, so that the battery pack system is designed to be in a two-branch parallel connection mode, the requirement on the consistency of the battery pack system is high due to parallel connection, if the pressure difference between branches is more than about 3V, a loop can be formed between the branches, and the circulation hidden danger between the branches is increased.
If the pressure difference exists between the branch A and the branch B, the MSD maintenance switches M1 and M2 are in an off state firstly, the voltage-sharing resistors R11 and R21 can limit the circulating current to be below 10A (the value can be adjusted by adjusting the resistance values of the voltage-sharing resistors R11 and R21), the loss caused by the pressure difference is mainly consumed on the voltage-sharing resistors R11 and R21, and the consistency and the service life of the battery module are hardly influenced. Meanwhile, the light emitting diode units D1 and D2 are used for indicating whether the voltage equalizing process is finished, when the light emitting diode units D1 and D2 are in a lighting state, the two ends of the light emitting diode units D1 and D2 are proved to have certain voltage, at the moment, a voltage difference exists between the branch A and the branch B, and the voltage equalizing process is in progress; when the led units D1 and D2 are extinguished, it is proved that the voltages at the two ends of the led units D1 and D2 are very small, and at this time, the voltage difference between the branch a and the branch B disappears, and the voltage equalizing process is ended.
Then, MSD maintenance switches M1 and M2 are closed, voltage-sharing resistors and current-limiting resistors are equivalently short-circuited, the current of the battery module in the branch A is output through one path of the MSD maintenance switch M1, the current of the battery module in the branch B is output through one path of the MSD maintenance switch M2, and the battery module in the branch A and the battery module in the branch B are connected in parallel to form a whole to supply power to a load. In addition, in the normal use process of the battery pack system, the BMS monitors the pressure difference between the A branch battery module and the B branch battery module in real time, the consistency of the A branch battery module and the B branch battery module is kept through the pressure equalizing process at any time, and the phenomenon of large circulation caused by overlarge pressure difference between two paths can be avoided.
In addition, during normal vehicle operation, branch fault judgment can be realized through the Hall sensor T1 and the shunt T2, and the total current (I) of the two branchesGeneral assembly) Detected by Hall sensor T1, single branch current (I)1) Detected by a shunt T2 when IGeneral assembly*0.4≤I1≤IGeneral assemblyAnd when 0.6, the battery pack system is considered to be normal, otherwise, the branch circuit fault is reported. If the branch circuit is in fault, the battery pack system limits the power by 50% in a discharging state, and charging is forbidden in a charging mode.
In the above embodiment, the light emitting diode unit is used as a voltage sharing indicator to output a light indicating signal when the voltage across the light emitting diode unit is greater than a certain value, otherwise, the light indicating signal is not output, and the voltage sharing in two directions can be realized by two diodes connected in parallel in an opposite direction. Moreover, the voltage sharing indicator can also be a component for outputting other indicating signals, such as: a flash lamp (for example, a flash lamp, more preferably, two flash lamps connected in parallel in reverse for realizing voltage sharing in two directions), or a sound output device such as a buzzer (for example, a buzzer, more preferably, two buzzers connected in parallel in reverse for realizing voltage sharing in two directions), or an audible and visual alarm (for example, an audible and visual alarm, more preferably, two audible and visual alarms connected in parallel in reverse for realizing voltage sharing in two directions). Therefore, the voltage-sharing indicator is an optical/acoustic indicating signal voltage-sharing indicating unit capable of outputting an optical and/or acoustic indicating signal. Of course, the voltage sharing indicator may be a device such as a voltage detection device that outputs an electrical quantity signal, besides the sound and light indication signals, and when the voltage across the voltage detection device is greater than a certain value (for example, a differential pressure set value), the voltage detected by the voltage detection device is greater, and the voltage detection device is determined to output the indication signal; when the voltage at the two ends of the voltage detection equipment is smaller than or equal to the certain value, the voltage detected by the voltage detection equipment is smaller, and the voltage detection equipment is determined not to output the indication signal. Therefore, the pressure-equalizing indicator is any device which meets the following requirements: when the voltage at two ends of the voltage-sharing indicator is larger than a certain value (such as a pressure difference set value), an indicating signal is output, otherwise, the indicating signal is not output.
In the above embodiments, the coupling relationship between the voltage-sharing resistor and the voltage-sharing indicator is a parallel connection relationship, and as another embodiment, the coupling relationship between the voltage-sharing resistor and the voltage-sharing indicator may also be a series connection relationship, and the function of the voltage-sharing indicator can also be realized.
In addition, it should be noted that, the battery module and the battery voltage equalizing device in the battery pack system provided in this embodiment form the battery pack system through an internal connection relationship, and therefore, in the battery pack system, the positive electrode interface and the negative electrode interface in the battery voltage equalizing device are connected to the corresponding battery module, and then, in terms of the battery pack system, the positive electrode interface and the negative electrode interface are connected to the positive electrode and the negative electrode of the battery module, which can be understood as not including the positive electrode interface and the negative electrode interface, the positive electrode of each battery module is directly connected to the corresponding positive electrode connection circuit, and the negative electrode of each battery module is directly connected to the corresponding negative electrode connection circuit. However, if the battery pack voltage equalizing device is used as a separate device, the battery pack voltage equalizing device needs to include a positive electrode interface and a negative electrode interface for correspondingly connecting the battery modules.
The specific embodiments are given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention lies in the above basic scheme, and to the ordinary skilled in the art, according to the present invention, the model, formula, parameter of various deformation are designed without the need of creative labor. Variations, modifications, substitutions and alterations of the embodiments may be made without departing from the principles and spirit of the invention, which is still within the scope of the invention.
Battery pack voltage-sharing device embodiment:
this embodiment provides a battery pack voltage equalizing device, which can be individually protected as an independent device, and since the detailed description is given in the above battery pack system embodiment, the detailed description is omitted here.
Claims (10)
1. A battery pack voltage equalizing device, comprising:
at least two positive electrode interfaces for connecting the positive electrodes of the corresponding battery modules;
a master positive interface;
at least two negative electrode interfaces which correspond to the positive electrode interfaces and are used for connecting the negative electrodes of the corresponding battery modules; and
a total negative interface;
each positive electrode interface is connected with the total positive interface through a corresponding positive electrode connecting circuit, and each negative electrode interface is connected with the total negative interface through a corresponding negative electrode connecting circuit; the voltage-sharing module is connected in series with at least one connecting line in each positive connecting line and each negative connecting line and comprises a voltage-sharing switch, the voltage-sharing switch is connected in series with the corresponding connecting line, the voltage-sharing switch is connected in parallel with a voltage-sharing resistor branch, a voltage-sharing indicator which is provided with a voltage-sharing resistor and is coupled with the voltage-sharing resistor is arranged on the voltage-sharing resistor branch, the voltage-sharing indicator is used for outputting an indicating signal when the voltage at two ends of the voltage-sharing indicator is greater than a pressure difference set value, and otherwise, the indicating signal is not output.
2. The battery pack voltage equalizing device according to claim 1, wherein the voltage equalizing indicator is a light/sound indicating signal voltage equalizing indicating unit capable of outputting a light and/or sound indicating signal.
3. The battery pack voltage equalizing device according to claim 2, wherein the light/sound indicating signal voltage equalizing indicating unit is two light emitting diodes arranged in anti-parallel.
4. The battery pack voltage equalizing device according to claim 1, 2, or 3, wherein the voltage equalizing indicator is disposed in parallel with the voltage equalizing resistor.
5. The battery pack voltage equalizing device according to claim 4, wherein a current limiting resistor is further connected in series on a line on which the voltage equalizing indicator is located.
6. A battery pack system, comprising:
at least two battery modules;
a master positive interface; and
a total negative interface;
the positive electrode of each battery module is connected with the total positive interface through a corresponding positive electrode connecting circuit, and the negative electrode of each battery module is connected with the total negative interface through a corresponding negative electrode connecting circuit; the voltage-sharing module is connected in series with at least one connecting line in each positive connecting line and each negative connecting line and comprises a voltage-sharing switch, the voltage-sharing switch is connected in series with the corresponding connecting line, the voltage-sharing switch is connected in parallel with a voltage-sharing resistor branch, a voltage-sharing indicator which is provided with a voltage-sharing resistor and is coupled with the voltage-sharing resistor is arranged on the voltage-sharing resistor branch, the voltage-sharing indicator is used for outputting an indicating signal when the voltage at two ends of the voltage-sharing indicator is greater than a pressure difference set value, and otherwise, the indicating signal is not output.
7. The battery pack system according to claim 6, wherein the voltage-sharing indicator is a light/sound indicating signal voltage-sharing indicating unit capable of outputting a light and/or sound indicating signal.
8. The battery pack system according to claim 7, wherein the light/sound indicating signal voltage equalizing indicating unit is two light emitting diodes arranged in inverse parallel.
9. The battery system according to claim 6, 7 or 8, wherein the voltage-sharing indicator is disposed in parallel with the voltage-sharing resistor.
10. The battery pack system according to claim 9, wherein a current limiting resistor is further connected in series on the line on which the voltage sharing indicator is located.
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| CN201920658246.6U CN209987775U (en) | 2019-05-08 | 2019-05-08 | Battery pack voltage-sharing device and battery pack system |
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| CN201920658246.6U CN209987775U (en) | 2019-05-08 | 2019-05-08 | Battery pack voltage-sharing device and battery pack system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111509805A (en) * | 2020-04-28 | 2020-08-07 | 浙江衡睿科技有限公司 | Low-voltage parallel battery operation control system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111509805A (en) * | 2020-04-28 | 2020-08-07 | 浙江衡睿科技有限公司 | Low-voltage parallel battery operation control system and method |
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