CN209987774U - Battery module voltage-sharing device - Google Patents

Abstract

The utility model relates to a battery module voltage-sharing device, including voltage-sharing module and two interfaces, these two interfaces are connected through a interconnecting link, and voltage-sharing module includes voltage-sharing resistance and the voltage-sharing indicator that sets up with the coupling of voltage-sharing resistance, and the voltage-sharing resistance is established on the interconnecting link in series. When needs carry out the voltage-sharing to battery module, correspond two interfaces and two battery modules that need the voltage-sharing and be connected, drop into voltage-sharing resistance, consume the pressure differential through voltage-sharing resistance, the uniformity between the battery module has been promoted, and, this battery module voltage-sharing device is portable external equipment, be connected through two battery modules with needs the voltage-sharing, can carry out the voltage-sharing to any two battery modules that need the voltage-sharing, the portability is stronger, and the practicality is stronger, and, can make the staff directly perceivedly learn whether the circulation is eliminated through the voltage-sharing indicator, and just can acquire the circulation immediately and eliminate constantly at the voltage-sharing completion, promote the immediacy.

Description

Battery module voltage-sharing device

Technical Field

The utility model relates to a battery module voltage-sharing device.

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 formed by directly connecting battery modules in parallel, and if the pressure difference between the battery modules is too large (larger than 5V), the circulation effect of the battery modules and the battery modules can cause certain influence on the service life and consistency of the battery systems.

The conventional battery module voltage-sharing device can only be used as one part of a battery pack to be connected into the battery pack and form a whole with the battery pack, and cannot realize a portable voltage-sharing function, namely cannot be used as a portable external device to share the voltage of a battery module needing voltage sharing, and cannot detect the voltage-sharing condition among the battery modules.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a battery module voltage-sharing device for solve current battery module voltage-sharing device and can't go on externally with battery module and detect and the problem of voltage-sharing in order to carry out the voltage-sharing to battery module.

In order to achieve the above object, the present invention provides a voltage equalizing device for battery modules, including:

two interfaces connected by a connecting line; and

the voltage-sharing module comprises a voltage-sharing resistor and a voltage-sharing indicator coupled with the voltage-sharing resistor, the voltage-sharing resistor is arranged on the connecting line in series, 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 voltage sharing is needed to be carried out on two battery modules, two interfaces in the voltage sharing device of the battery modules are connected with the positive electrodes of the two battery modules, the negative electrodes of the two battery modules need to be connected together, or the negative electrodes of the two battery modules need to be connected together, and the positive electrodes of the two battery modules need to be connected together. Drop into voltage-sharing resistance, consume pressure difference through voltage-sharing resistance, promoted the uniformity between the battery module to, this battery module pressure equalizing is portable external equipment, is connected through two battery modules with need voltage-sharing, can carry out the voltage-sharing to any two battery modules that need the voltage-sharing, and the portability is stronger, and the practicality is stronger. And, when the voltage sharing did not accomplish, there was certain voltage at the both ends of voltage sharing indicator, voltage sharing indicator output instruction signal, when the voltage sharing was accomplished, the pressure differential between the battery module was very little or do not have the pressure differential, at this moment, the voltage at the both ends of voltage sharing indicator was very little, or do not have the voltage, then, voltage sharing indicator just did not output instruction signal, consequently, can detect the voltage sharing condition between the battery module through voltage sharing indicator, whether detect the voltage differential in order to carry out the voltage sharing between the battery module promptly, can also make the staff directly perceived learn whether the circulation has eliminated, just can acquire the circulation immediately at the moment that the voltage sharing was accomplished and eliminate, 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.

Further, the voltage-sharing module further comprises a voltage-sharing switch, and the voltage-sharing switch and the voltage-sharing resistor are connected in parallel.

Further, the voltage equalizing switch is an MSD maintenance switch.

Drawings

Fig. 1 is a specific circuit structure diagram of the voltage equalizing device for battery modules according to the present invention.

Detailed Description

Battery module voltage-sharing device embodiment:

the embodiment provides a voltage-sharing device for a battery module, which comprises two interfaces, namely an interface a and an interface B, as shown in fig. 1, wherein the interface a and the interface B are connected through a connecting line. The connection line is provided with the voltage-sharing modules, the number of the voltage-sharing modules is set according to actual needs, one voltage-sharing module can be set, or at least two voltage-sharing modules can be set. In summary, the present invention provides a battery module voltage equalizing device, which is provided with a voltage equalizing module.

As shown in fig. 1, the first voltage equalizing module includes a voltage equalizing switch, here, the voltage equalizing switch is exemplified by MSD maintenance switch M1, and MSD maintenance switch M1 is specified as miniMSD-350A. MSD maintenance switch M1 is connected in series on the connecting line, MSD maintenance switch M1 and voltage-sharing resistor R11 are connected in parallel, the specification of voltage-sharing resistor R11 is 100R100W, voltage-sharing resistor R11 is connected in parallel with a branch, a current-limiting resistor R12 and a light-emitting diode unit D1 are connected in series on the branch, and 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. The other voltage equalizing module has the same structure as the voltage equalizing module, wherein the connection relationship among the MSD maintenance switch M2, the voltage equalizing resistor R21, the current limiting resistor R22 and the led unit D2 is the same as the voltage equalizing module, as shown in fig. 1, and the specifications of the MSD maintenance switch M2 and the voltage equalizing resistor R21 are the same as the voltage equalizing module, and thus, they will not be described in detail here.

When voltage sharing is needed to be performed on any two battery modules in the battery pack, or voltage sharing is performed on any two independent battery modules, for example, when the voltage difference between the two battery modules is greater than about 3V, a loop is formed, and the potential risk of circulation is increased, then, the interface a and the interface B are respectively connected with the anodes of the two battery modules correspondingly, if the anodes of the two battery modules have other connecting lines (for example, connecting lines in the battery pack), the connecting lines need to be disconnected, and certainly, in order to form a loop, the cathodes of the two battery modules need to be connected, so that the two battery modules are connected together in parallel. If the two battery modules are themselves in a parallel relationship, i.e., the negative electrodes are connected together at all times, there is no need to operate the negative electrodes of the two battery modules. When the MSD maintenance switches M1 and M2 are controlled to be in an off state, the voltage-sharing resistors R11 and R21 can limit the circulation 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 two battery modules, and the voltage equalizing process is in progress; when the led units D1 and D2 are extinguished, it is proved that the voltages at both ends of the led units D1 and D2 are very small, and at this time, the voltage difference between the two battery modules disappears and the voltage equalizing process is finished. And finally, disconnecting the interface A and the interface B from the two battery modules, so that the two battery modules can recover the original connection relation.

In the above embodiment, when the voltage of the two battery modules is equalized, the interface a and the interface B are connected to the positive electrodes of the two battery modules, as another embodiment, the interface a and the interface B may be connected to the negative electrodes of the two battery modules, and then, in order to form a loop, the positive electrodes of the two battery modules need to be connected. In addition, as with the above, if the two battery modules themselves are in a parallel relationship, i.e., the positive electrodes are connected together by nature, there is no need to operate the positive electrodes of the two battery modules.

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 the 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 the above embodiment, the voltage-sharing resistor in the voltage-sharing module is connected in parallel with the voltage-sharing switch, and as another embodiment, the voltage-sharing switch in the voltage-sharing module may not be provided, so that it is equivalent to that the voltage-sharing resistor is serially arranged on the connection line between the interface a and the interface B.

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.

Claims (7)

1. A battery module voltage equalizing device, comprising:

two interfaces connected by a connecting line; and

the voltage-sharing module comprises a voltage-sharing resistor and a voltage-sharing indicator coupled with the voltage-sharing resistor, the voltage-sharing resistor is arranged on the connecting line in series, 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 module voltage equalizing device according to claim 1, wherein the voltage equalizing indicator is a light/sound indicating signal voltage equalizing indicating unit that can output a light and/or sound indicating signal.

3. The battery module voltage sharing device according to claim 2, wherein the light/sound indicating signal voltage sharing indicating unit is two light emitting diodes arranged in inverse parallel.

4. The battery module 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 module 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. The battery module voltage-sharing device according to claim 4, wherein the voltage-sharing module further comprises a voltage-sharing switch, and the voltage-sharing switch is connected in parallel with the voltage-sharing resistor.

7. The battery module voltage sharing apparatus of claim 6, wherein the voltage sharing switch is an MSD service switch.

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