CN220066907U - Battery pack and energy storage system - Google Patents

Abstract

The utility model belongs to the technical field of energy storage, and provides a battery pack and an energy storage system, wherein a first parallel machine interface and a second parallel machine interface are respectively arranged on two sides of the battery pack, a communication circuit is connected between a communication pin of the first parallel machine interface and a communication pin of the second parallel machine interface, a first end of a position detection circuit is connected with the position detection pin of the first parallel machine interface, a second end of the position detection circuit is connected with the position detection pin of the second parallel machine interface, a sampling circuit collects voltage signals of the first end or the second end of the position detection circuit, and a control circuit generates position detection signals according to the voltage signals and outputs the position detection signals through the communication circuit, so that the position of each battery pack in the whole system can be determined according to the position detection signals, the position of a fault battery pack can be rapidly determined, and potential safety hazards can be timely eliminated.

Description

Battery pack and energy storage system

Technical Field

The utility model belongs to the technical field of energy storage, and particularly relates to a battery pack and an energy storage system.

Background

Currently, in a home energy storage system, a user may purchase a plurality of battery packs, and connect the battery packs in parallel to increase the capacity of the energy storage system, so as to meet the power demand of the user.

However, in the multi-battery pack parallel system, since each battery pack is not connected to the energy storage system in a fixed sequence, when a certain battery pack fails, the position of the failed battery pack cannot be quickly determined, so that the system cannot be overhauled in time, and the problem of high potential safety hazard exists.

Disclosure of Invention

The utility model aims to provide a battery pack and an energy storage system, and aims to solve the problem that in an energy storage system with a plurality of battery packs connected in parallel, when a single battery pack fails, the position of the failed battery pack cannot be determined quickly, and a large potential safety hazard exists.

A first aspect of an embodiment of the present utility model provides a battery pack including:

the first parallel machine interface is arranged on the battery pack; the first parallel interface is used for being connected with a second parallel interface of the state display device or other battery packs;

the second parallel operation interface is arranged on the battery pack; the second parallel interface is used for being connected with a first parallel interface of the base or other battery packs;

the communication circuit is connected between the communication pin of the first parallel operation interface and the communication pin of the second parallel operation interface;

the first end of the position detection circuit is connected with the position detection pin of the first parallel machine interface, and the second end of the position detection circuit is connected with the position detection pin of the second parallel machine interface; the position detection circuit provides an operating voltage by the battery pack or the status display device;

the sampling circuit is used for collecting voltage signals of the first end or the second end of the position detection circuit;

and the control circuit is connected with the communication circuit and the sampling circuit and is used for generating a position detection signal according to the voltage signal and outputting the position detection signal through the communication circuit.

In one embodiment, the battery pack further comprises a first end cap removably connected to the first parallel port; the status display device is integrated on the first end cap; the state display device comprises a third parallel interface, wherein the third parallel interface comprises a power pin and a position detection pin, and the position detection pin is electrically connected with the power pin so as to receive the working voltage provided by the battery pack or other battery packs to which the battery pack is connected.

In one embodiment, the status display device includes:

the state control unit is connected with the communication pin of the third parallel interface, so as to receive the position detection signal of each battery pack transmitted by the communication pin, and acquire the position relation of each battery pack based on the position detection signal; and

and the display unit is used for displaying the position relation.

In one embodiment, the state control unit is further configured to obtain and display a state parameter of each battery pack through a communication pin of the third parallel interface.

In one embodiment, the control circuit is further configured to receive a position detection signal transmitted by another battery pack through the communication circuit, and obtain a positional relationship between each battery pack based on the position detection signal; the control circuit is also used for outputting the position relation to an accessed battery pack or the state display device through the communication circuit.

In one embodiment, the battery pack further comprises a power circuit and a power switch; the first parallel interface also comprises a power supply pin; the power switch is arranged between the power circuit and a power pin of the first parallel machine interface and used for controlling the connection state between the power circuit and the power pin so that the power circuit provides the working voltage to the position detection circuit when the power switch is conducted.

In one embodiment, further comprising: a second end cover detachably connected to the second parallel operation interface; the base is integrated on the second end cap.

In one embodiment, the base comprises a fourth parallel interface and a termination resistor; the position detection pin of the fourth parallel operation interface is grounded; and the terminal resistor is connected with the communication pin of the fourth parallel interface to serve as the terminal resistor of the communication circuit.

The second aspect of the embodiment of the present utility model further provides an energy storage system, including:

a plurality of battery packs as in any one of the above embodiments; and the plurality of battery packs are connected through the first parallel connection interface or the second parallel connection interface.

A third aspect of an embodiment of the present utility model further provides an energy storage system, including:

the base is provided with a fourth parallel operation interface;

the state display device is provided with a third parallel operation interface; and

a plurality of battery packs as described in the above embodiments; the battery packs are connected between the base and the state display device through the first parallel connection interface or the second parallel connection interface.

The embodiment of the utility model provides a battery pack, wherein a first parallel interface and a second parallel interface are respectively arranged at two sides of the battery pack, a communication circuit and a position detection circuit are connected between the first parallel interface and the second parallel interface, and a control circuit and a sampling circuit are further arranged inside the battery pack. According to the utility model, the sampling circuit in the battery pack is used for collecting the voltage signal of the first end or the second end of the position detection circuit, the control circuit is connected with the sampling circuit and the communication circuit, and the position detection signal is generated according to the voltage signal and then is output through the communication circuit, so that the position of each battery pack in the whole system can be determined according to the position detection signal, the position of a fault battery pack can be rapidly determined, and potential safety hazards can be timely eliminated.

Drawings

Fig. 1 is a schematic circuit diagram of a battery pack according to an embodiment of the present utility model;

fig. 2 is a schematic circuit diagram of a battery pack according to one embodiment of the present utility model;

fig. 3 is a schematic circuit diagram of a battery pack according to one embodiment of the present utility model;

fig. 4 is a schematic circuit diagram of a battery pack according to one embodiment of the present utility model;

fig. 5 is a schematic circuit diagram of a battery pack according to one embodiment of the present utility model;

FIG. 6 is a schematic diagram of an energy storage system according to one embodiment of the present utility model;

FIG. 7 is a schematic diagram of an energy storage system according to an embodiment of the present utility model;

fig. 8 is a schematic structural diagram of an energy storage system according to an embodiment of the present utility model.

Detailed Description

In order that those skilled in the art will better understand the present utility model, a technical solution of an embodiment of the present utility model will be clearly described below with reference to the accompanying drawings in the embodiment of the present utility model, and it is apparent that the described embodiment is a part of the embodiment of the present utility model, but not all the embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

The term "comprising" in the description of the utility model and the claims and in the above figures and any variants thereof is intended to cover a non-exclusive inclusion. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed but may optionally include additional steps or elements not listed or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used for distinguishing between different objects and not for describing a particular sequential order.

In a home energy storage system, a plurality of energy storage devices are usually used in parallel, and in a multi-battery pack parallel system, since each battery pack is not connected to the energy storage system in a fixed sequence, when a certain single battery pack fails, there is a problem that the position of the failed battery pack cannot be quickly determined.

In order to solve the above-mentioned technical problems, an embodiment of the present utility model provides a battery pack, referring to fig. 1, a battery pack 100 in the present embodiment includes: a first parallel interface 110, a second parallel interface 120, a communication circuit 300, a position detection circuit 200, a sampling circuit 400, and a control circuit 500.

Specifically, the first parallel interface 110 is configured to connect with the second parallel interface 120 of the status display device or other battery pack; the second parallel interface 120 is configured to connect with the first parallel interface 110 of the base or other battery pack.

The first parallel interface 110 and the second parallel interface 120 may be disposed on the left and right sides, front and rear sides, upper and lower sides, or the same side of the battery pack 100. The first parallel interface 110 and the second parallel interface 120 include power pins, so that power can be transmitted through the power pins. By providing the first parallel interface 110 and the second parallel interface 120 on the battery pack 100, when the battery pack 100 is connected in parallel with other battery packs, adjacent battery packs can be electrically connected through the first parallel interface 110 and the second parallel interface 120.

In the present embodiment, the communication circuit 300 is connected between the communication pin of the first parallel interface 110 and the communication pin of the second parallel interface 120; a first end of the position detection circuit 200 is connected with a position detection pin of the first parallel interface 110, and a second end of the position detection circuit 200 is connected with a position detection pin of the second parallel interface 120; the position detection circuit 200 is provided with an operating voltage by the battery pack 100 or the status display device; the sampling circuit 400 is configured to collect a voltage signal at a first end or a second end of the position detection circuit 200; the control circuit 500 is connected to the communication circuit 300 and the sampling circuit 400, and generates a position detection signal from the voltage signal and outputs the position detection signal through the communication circuit 300.

In this embodiment, the position detection circuit 200 obtains the working voltage through the position detection pin in the first parallel interface 110 or the second parallel interface 120, the sampling circuit 400 samples the voltage at the first end or the second end of the position detection circuit 200, that is, near the first end of the first parallel interface 110 or near the second end of the second parallel interface 120, and sends the sampled voltage signal to the control circuit 500, and the control circuit 500 performs signal conversion based on the voltage signal to generate a position detection signal, and sends the position detection signal to the communication circuit 300, and sends the position detection signal to the communication pin of the first parallel interface 110 or the second parallel interface 120 through the communication circuit 300.

In one embodiment, CAN communication is used, so that the position detection signal of each battery pack is sent to each battery pack device or status display device connected to the CAN bus via the CAN bus, and in this embodiment, the position detection signal includes a sampling voltage signal and identification information of the battery pack 100. The identification information may be one or more of a Serial Number (SN) of the battery pack 100 at the time of shipment, a generated random Number, and battery pack ID information set by a user.

In this embodiment, the position detection circuit 200 includes one or a plurality of position detection resistors Rs connected in series, as shown in fig. 6, two ends of the position detection resistor Rs are respectively connected to the position detection pins of the first parallel interface 110 and the second parallel interface 120.

In one embodiment, the sampling circuit 400 may be a voltage dividing circuit composed of a plurality of resistors, and is configured to send a voltage signal obtained by dividing a voltage at one end of the position detecting circuit 200 to the control circuit 500.

In one embodiment, the sampling circuit 400 may be integrated in the control circuit 500, and the control circuit 500 is directly and electrically connected to one end of the position detecting circuit 200, and samples the voltage at one end of the position detecting circuit 200 to obtain a corresponding voltage signal.

In one embodiment, the first parallel interface 110 on the first side of the battery pack 100 may be further configured to be connected to a status display device, where the status display device is configured to receive the position detection signal output by the communication pin of the first parallel interface 110 on the first side of the battery pack 100, and display the position detection signal by the status display device.

In one embodiment, the communication circuit 300, the position detection circuit 200, the sampling circuit 400 and the control circuit 500 are all disposed inside the battery pack 100, and the battery pack 100 further includes a battery cell inside, where the battery cell inside the battery pack 100 may be connected to the position detection pin through a power pin in the parallel interface after passing through the voltage conversion circuit or the current limiting circuit, so as to provide an operating voltage for the position detection circuit 200.

In one embodiment, when the plurality of battery packs 100 are connected in parallel, the first parallel connection interface 110 and the second parallel connection interface 120 of the adjacent battery packs may be connected in parallel in a plugging manner, for example, the first parallel connection interface 110 and the second parallel connection interface 120 are respectively configured as a male connector and a female connector, so that the battery packs 100 may be connected in a plugging manner with corresponding male connectors or female connectors on other battery packs, so as to realize electrical connection between the battery packs 100.

In one embodiment, the first parallel connection interface 110 and the second parallel connection interface 120 of the battery pack 100 may be disposed on the upper side and the lower side of the battery pack 100, may be disposed on the left side and the right side of the battery pack 100, or may be disposed on the front side and the back side of the battery pack 100, respectively, and the specific arrangement positions thereof may be set according to the application scenario.

In one embodiment, the battery pack 100 may be connected in parallel with other battery packs through a power line connected to the parallel connection interface, where the first parallel connection interface 110 and the second parallel connection interface 120 need not be disposed oppositely, and may be disposed at any position of the battery packs.

In this embodiment, after a plurality of battery packs 100 are connected in parallel through a parallel connection interface, a position detection resistor Rs in each battery pack 100 is connected in series through a position detection pin in the parallel connection interface, after the position detection pin receives an operating voltage, a voltage signal at a first end or a second end of the position detection circuit 200 is collected through the sampling circuit 400, and is transmitted to the control circuit 500 to be converted into a position detection signal, and after the position detection signal is transmitted to the rest of battery packs 100 through the communication circuit 300, the position ordering of the battery packs 100 in the plurality of battery packs after parallel connection can be determined. It should be noted that when a plurality of battery packs are connected in parallel, only one battery pack is needed or the state display device alone provides the operating voltage required for position detection.

In one embodiment, as shown in connection with fig. 2, the battery pack 100 further includes a first end cap 600 removably coupled to the first parallel machine interface 110, and the status display device 610 is integrated with the first end cap 600.

In the present embodiment, when the battery pack 100 needs to be used, the first end cap 600 is inserted into the battery pack 100 to function as the status display device 610, and when the battery pack 100 stands by or is suspended from use, the first end cap 600 is used to protect the first parallel interface 110 of the battery pack 100.

When a plurality of battery packs 100 are stacked in parallel, if the battery pack 100 is positioned at the top, the third parallel interface 130 on the first end cap 600 is inserted into the first parallel interface of the battery pack 100, thereby providing a status display function for the battery pack 100. The first end cap may be removed when the battery pack 100 needs to be used in combination with other battery packs.

The status display device 610 includes a third parallel interface 130, where the third parallel interface 130 includes a power pin and a position detection pin; the position detection pin is electrically connected with the power supply pin.

In this embodiment, a dc power VCC may be disposed in the status display device 610 and connected to a power pin in the third parallel interface 130 for providing an operating voltage for the position detection circuit.

In one embodiment, when the first end cover 610 is connected to the battery pack, the power pin and the position detection pin in the third parallel interface 130 are connected to corresponding pins of the first parallel interface 110 of the battery pack 100, so that the status display device 610 integrated on the first end cover and the position detection circuit 200 in the battery pack 100 can receive the operating voltage provided by the battery pack 100 or other battery packs to which the battery pack 100 is connected.

In one embodiment, as shown in connection with FIG. 3, status display device 610 includes: a state control unit 611 and a display unit 612.

The state control unit 611 is connected to the communication pins of the third parallel interface 130, so as to receive the position detection signals of the battery packs 100 transmitted by the communication pins, and obtain the position relationship between the battery packs 100 based on the position detection signals; the display unit 612 is used to display the positional relationship.

In the present embodiment, the status display device 610 is connected to the first parallel interface 110 of the battery pack 100 through the third parallel interface 130, wherein the communication pin of the status control unit 611 is connected to the communication pin of the first parallel interface 110 of the battery pack 100, so as to obtain the position detection signal on the communication circuit 300 through the communication pin. When a plurality of battery packs 100 are connected to each other through the parallel connection interface, the state control unit 611 receives the position detection signals output by the control circuit 500 of each battery pack to the communication circuit 300 through the communication pins, obtains the position relationship between the battery packs 100 according to the position detection signals, generates a display signal, sends the display signal to the display unit 612, and finally displays the position relationship by the display unit 612.

In one embodiment, the display unit 612 may be a display screen, a voice player, or a playing device such as a projector, for presenting display signals to a user by means of light, voice, or pictures.

In one embodiment, the status display device 610 does not separately provide the display unit 612 for display functions due to the size of the first end cap 600, etc. It will be appreciated that a micro display screen may also be integrated on the end cap as the display unit 612.

In one embodiment, the communication circuit 300 may be a CAN (Controller Area Network ) communication bus, and the communication pins in the first parallel interface 110 and the second parallel interface 120 of the battery pack 100 are CAN communication pins. After generating the position detection signal, the control circuit 500 will broadcast the position detection signal to other battery packs or state control units 611 via the CAN bus.

In one embodiment, the communication circuit 300 includes a first CAN bus 301 and a second CAN bus 302, the first CAN bus 301 and the second CAN bus 302 being connected between two communication pins of the first parallel interface 110 and the second parallel interface 120, respectively.

In one embodiment, the state control unit 611 is further configured to obtain and display a state parameter of each battery pack 100 through a communication pin of the second parallel interface 120.

In the present embodiment, the state parameters of the battery pack 100 include the voltage of the battery cells in the battery pack 100, the current when the battery cells are charged or discharged, and whether the battery pack 100 is on-line or not.

The control circuit 500 obtains the voltage signal of the first end or the second end of the position detection circuit 200 through the sampling circuit 400, meanwhile, the control circuit 500 can also detect parameters of the internal battery core, such as the voltage of the two ends of the internal battery core, etc. through being connected with the battery core in the battery pack 100, generate a position detection signal by the voltage signal and the parameters of the battery core, send the position detection signal to the communication circuit 300, and finally transmit the position detection signal to the state display device 610 through the communication circuit 300, at this time, the state control unit 611 in the state display device 610 is connected to the communication circuit 300 through a communication pin, so as to receive the position detection signal, convert the received position detection signal into a display signal containing the position information and the state information of the battery pack 100, send the display signal to the display unit 612, and display the state parameters of each battery pack 100 by the display unit 612.

In one embodiment, the control circuit 500 is further configured to receive a position detection signal transmitted by another battery pack through the communication circuit 300, and obtain a positional relationship between the battery packs 100 based on the position detection signal; the control circuit 500 is further configured to output the positional relationship to the remaining battery packs 100 or the status display device 610 connected through the parallel interface via the communication circuit 300.

In one embodiment, referring to fig. 4, the battery pack 100 further includes a power circuit 710 and a power switch 720.

The first parallel interface 110 further includes a power pin; the power switch 720 is disposed between the power circuit 710 and a power pin of the first parallel interface 110, and is used for controlling a connection state between the power circuit 710 and the power pin, so that when the power switch 720 is turned on, an operating voltage is provided to the position detection circuit 200 by the power circuit 710.

In one embodiment, the power supply circuit 710 may be a voltage conversion circuit, which is configured to switch in the power supply voltage of the battery cell in the battery pack 100, convert the power supply voltage into an operating voltage, provide the operating voltage to the position detection circuit 200, and control the connection state between the power supply circuit 710 and the power supply pin through the power switch 720. At this time, the output of the power supply circuit 710 may be controlled by the control circuit 500.

In one embodiment, the power supply circuit 710 may also be a dc power supply VCC independently disposed within the battery pack 100, where the power supply VCC is connected to the power switch 720, and when the power switch 720 is turned on, the power supply VCC provides an operating voltage for the position detection circuit.

In one embodiment, when there are multiple battery packs 100 connected through the parallel interface, only one of the battery packs 100 may provide an operating voltage for the position detection circuit, and the control circuit 500 of the remaining battery packs 100 controls the power switch 720 to be turned off.

In one embodiment, referring to fig. 5, the battery pack 100 further includes: a second end cap 800 detachably connected to the second parallel operation interface 120, and a base 810 is integrated with the second end cap 800.

In one embodiment, the second end cap 800 may perform the function of a base for supporting the battery pack 100 when the second end cap 800 is connected to the second parallel interface of the battery pack 100.

When a plurality of battery packs 100 are stacked in parallel, if the battery pack 100 is the bottommost battery pack, the second end cap 800 is inserted into the first parallel port of the battery pack 100, thereby forming a base function.

In a specific application, if the battery pack is located at another position, the second end cover 800 is pulled out to connect with the parallel connection interfaces of other battery packs.

In one embodiment, referring to fig. 5, base 810 includes fourth parallel interface 140 and termination resistor R0.

In this embodiment, the base 810 includes the fourth parallel interface 140, and when the second end cover 800 is connected to the second parallel interface 120 of the battery pack 100, the fourth parallel interface 140 on the base 810 is connected to the second parallel interface 120 of the battery pack 100.

The position detection pin of the fourth parallel interface 140 of the base 810 is grounded, and the termination resistor R0 is connected to the communication pin of the first parallel interface 110 to serve as a termination resistor of the communication circuit 300.

In this embodiment, the fourth parallel interface 140 and the second parallel interface 120 include two communication pins, and in a specific application, one communication pin may be an input signal pin, the other may be an output signal pin, and two ends of the termination resistor R0 are respectively connected to two communication pins of the first parallel interface 110.

In one embodiment, as shown in connection with fig. 6, the communication circuit 300 may include a first CAN bus 301 and a second CAN bus 302, the first CAN bus 301 and the second CAN bus 302 being connected between two communication pins of the first parallel interface 110 and the second parallel interface 120, respectively. The first CAN bus 301 is a high-speed CAN bus (can_h), the second CAN bus 302 is a low-speed CAN bus (can_l), and the termination resistor R0 is connected between the first CAN bus 301 and the second CAN bus 302.

In one embodiment, as shown in fig. 6, when a plurality of battery packs 100 are connected through the parallel interface, the position detection resistor Rs is connected in series through the position detection pin in the parallel interface, and is grounded after being connected to the position detection pin in the base, and after the state display device or each battery pack 100 provides an operating voltage for the position detection circuit, a position detection loop is formed. Since the position of each battery pack 100 after the position detection resistor is connected in series is different, the voltage collected by the sampling circuit 400 is also different, so that the control circuit 500 CAN obtain a corresponding position detection signal according to the sampled voltage of each battery pack, and send the position detection signal to other battery packs or state display devices through the CAN bus, and also receive the position detection signals broadcast by other battery packs through the CAN bus. The positions of the respective battery packs 100 can be determined by sorting according to the position detection signals broadcast by the respective battery packs 100, so that the positions of the battery packs 100 can be rapidly located when the battery packs 100 fail.

The embodiment of the utility model also provides an energy storage system, which comprises a plurality of battery packs according to any one of the embodiments; the plurality of battery packs are connected through a first parallel interface or a second parallel interface.

Referring to fig. 6, the number of battery packs is 3, and the opposite sides of the battery pack 100 are respectively provided with a first parallel interface 110 and a second parallel interface 120, and the first parallel interface 110 and the second parallel interface 120 of adjacent battery packs 100 are electrically connected to form a power distribution terminal 101. The control circuit 500 includes two CAN communication pins and an ADC sampling pin, the two CAN communication pins are respectively connected to two CAN buses in the communication circuit 300, and the sampling circuit 400 is integrated in the control circuit and connected to the position detection circuit 200 through the ADC sampling pin, for collecting voltage signals.

In the present embodiment, the position detection circuit 200 is supplied with an operating voltage from the battery pack 100. The battery pack 100 may have a core to provide an operating voltage to the position detection pin in the first parallel interface, and the position detection circuit 200 is grounded after the battery pack (battery pack 3) located at the lowest position is connected to the second end cover 800, so that after the plurality of battery packs 100 are connected through the parallel interfaces, the position detection resistor Rs in each battery pack is connected in series through the position detection pin in the parallel interface, so as to form the position detection circuit 200. The communication circuit 300 in each battery pack is connected with the terminal resistor R0 in the second end cover 800 through the communication pin in the parallel connection interface to form a complete CAN communication loop. After the sampling circuit 400 collects the voltage signal of the position detection resistor Rs, the control circuit 500 converts the collected voltage signal and the identification information of the battery pack 100 into a position detection signal, sends the position detection signal to the CAN bus through the CAN communication pin, and sends the position detection signal to the rest of the battery packs 100 through the CAN bus, thereby obtaining the position information of each battery pack 100.

In one embodiment, as shown in fig. 7, a power source VCC is disposed in each battery pack, after a plurality of battery packs 100 are connected through a parallel connection interface, a position detection resistor Rs in each battery pack is connected in series through a position detection pin in the parallel connection interface to form a position detection circuit 200, and a communication circuit 300 in each battery pack is connected through a communication pin in the parallel connection interface to form a complete CAN communication loop after being connected with a termination resistor R0 in a second end cover 800. The position detection circuit 200 is powered by the power supply VCC inside the battery pack by connecting the power supply VCC inside each battery pack to the loop of the position detection circuit 200 and shorting the position detection pin to the power supply VCC by the fourth parallel interface 140 on the second end cap 800 at the top.

In one specific application embodiment, the output of the power supply VCC within the battery pack may be directly controlled by a control circuit within the battery pack to determine whether power needs to be provided to the circuitry of the position detection circuit 200.

In one embodiment, a control switch is provided between the power VCC in each battery pack and the circuit of the position detection circuit 200, and the on-off state of the control switch can control whether to supply power to the circuit of the position detection circuit 200.

In a specific application embodiment, the number of battery packs is 3, after the plurality of battery packs 100 are connected through parallel interfaces, any one of the battery packs 1, 2 or 3 may be selected to provide power for the circuit of the position detection circuit 200, and the power VCC in the remaining battery packs is disconnected, so as to achieve the purpose of providing power for the circuit of the position detection circuit 200 by only one battery pack.

In one embodiment, when the second end cover 800 is connected to the second parallel interface 120 of the battery pack 3, the fourth parallel interface 140 on the second end cover 800 is connected to the second parallel interface 120 of the battery pack 100. The position detection pin of the fourth parallel interface 140 of the second end cover 800 is grounded, and the termination resistor R0 is connected to the communication pin of the first parallel interface 110 to serve as a termination resistor of the communication circuit 300.

An embodiment of the present utility model further provides an energy storage system, as shown in fig. 8, where the energy storage system includes a base 810, a status display device 610, and a plurality of battery packs.

Specifically, the base 810 has a fourth parallel interface 140, and the status display device 610 has a second parallel interface; the plurality of battery packs are battery packs as in the above-described embodiments; the plurality of battery packs are connected between the base 810 and the status display device 610 through the first parallel interface or the second parallel interface.

Referring to fig. 8, the number of battery packs is 3, and the 3 battery packs are stacked in parallel in sequence, the first parallel interface of the uppermost battery pack (i.e. battery pack 1) is connected with the third parallel interface 130 of the status display device 610 in a matching manner to form the power distribution terminal 101, and the second parallel interface of the lowermost battery pack (i.e. battery pack 3) is connected with the fourth parallel interface 140 of the base 810 in a matching manner to form the power distribution terminal 101. The status display device 610 includes a dc power VCC and a status control unit 611. The base 810 includes a termination resistor R0 and a ground terminal GND, where the ground terminal GND is connected to a position detection pin in the fourth parallel interface 140 of the base 810, and the termination resistor R0 is connected between the CAN buses through a communication pin in the first parallel interface.

When the status display device 610, each battery pack 100 and the base 810 are connected to each other through the parallel interface, the position detection resistor Rs between each battery pack is connected in series between the dc power source VCC and the ground terminal GND, thereby forming a position detection loop. At this time, the control circuit 500 in each battery pack samples the position detection circuit 200 through the ADC sampling pin, so as to collect the voltage at one end of the position detection resistor Rs (for example, in fig. 7, the voltage near the second parallel interface 120 of the battery Bao Nadi may also collect the voltage near the first parallel interface 110 in the battery pack). Since each position detection resistor Rs is connected in series at a different position of the position detection circuit, the voltages collected by the control circuit 500 in each battery pack are different, so that the control circuit 500 converts the collected voltages into position detection signals, and the sequencing positions of the battery packs can be determined according to the position detection signals of the battery packs 100.

In this embodiment, the control circuit 500 of each battery pack 100 may send the position detection signal to the state control unit 611 through the CAN bus, and after the state control unit 611 receives the position detection signal of each battery pack 100, the battery packs 100 may be ordered, so as to determine the current position order. The status display device 610 further includes a display unit 612 that can sequence the positions of the respective battery packs 100. In a specific application, each battery pack CAN convert its own identification information and sampled voltage signals into position detection signals, broadcast the position detection signals through CAN bus (i.e. first CAN bus 301 and second CAN bus 302) communication, and receive position detection signals broadcast by other battery packs through CAN bus communication, so that the position detection signals of each battery pack CAN be sequenced, and the current stacked position of each battery pack CAN be determined. When the battery pack detects a fault, the position of the fault battery pack can be quickly located.

In one embodiment, the resistance value of the position detection resistor Rs is the same in the plurality of battery packs 100.

In one embodiment, the power VCC in the status display device 610 may obtain power from the power pin on the third parallel interface 130, and then power-convert the power from the battery pack and output the converted power as the power VCC.

In other embodiments, the status display device 610 may be provided with a separate power source, and the power VCC may be directly supplied.

In the present embodiment, the state control unit 611 in the state display device 610 is connected to the communication circuit 300 through a communication pin for controlling the CAN bus.

Specifically, the status display device 610 may receive the position detection signals broadcast by each battery pack through the CAN bus, and the status control unit 611 directly sorts the position detection signals of each battery pack and determines the current position sequence, and when a battery pack detects a fault, the faulty battery pack CAN be quickly located and displayed by the display unit 612 connected to the status control unit 611, thereby simplifying the processing steps of the position detection signals.

In one embodiment, the state control unit 611 may also control the connection state of the power VCC and the position detection circuit 200, and may set a detection time according to the needs of a user or an maintainer, for example, when the battery pack 100 is started, it is detected that the battery pack 100 is connected to or removed from the energy storage system through the parallel interface, and when the state of the battery pack is abnormal, the power VCC is turned on, so as to sequence each battery pack and locate the faulty battery pack.

In this embodiment, the first parallel connection interface and the second parallel connection interface are respectively disposed at two sides of the battery packs, so that the plurality of battery packs can be connected through the parallel connection interfaces to form the energy storage system. The CAN bus in the communication circuit is connected between the communication pins of the first parallel operation interface and the communication pins of the second parallel operation interface of each battery pack, and the CAN bus is controlled by a state control unit in the state display device and is connected with a terminal resistor in the base. The first end of the position detection resistor Rs in the position detection circuit is connected with the position detection pin of the first parallel connection interface of each battery pack, the second end of the position detection resistor Rs is connected with the position detection pin of the second parallel connection interface, after each battery pack forms an energy storage system, the position detection circuit is formed by the position detection resistor Rs, the power VCC and the ground terminal, and the sampling circuit collects voltage signals of the first end or the second end of the position detection resistor, the control circuit generates position detection signals according to the voltage signals and outputs the position detection signals to other battery packs and/or state display devices through the communication circuit.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.

The units described as separate units may or may not be physically separate, and units shown 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 units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present utility model may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.

Claims (10)

1. A battery pack, the battery pack comprising:

the first parallel machine interface is arranged on the battery pack; the first parallel interface is used for being connected with a second parallel interface of the state display device or other battery packs;

the second parallel operation interface is arranged on the battery pack; the second parallel interface is used for being connected with a first parallel interface of the base or other battery packs;

the communication circuit is connected between the communication pin of the first parallel operation interface and the communication pin of the second parallel operation interface;

the first end of the position detection circuit is connected with the position detection pin of the first parallel machine interface, and the second end of the position detection circuit is connected with the position detection pin of the second parallel machine interface; the position detection circuit provides an operating voltage by the battery pack or the status display device;

the sampling circuit is used for collecting voltage signals of the first end or the second end of the position detection circuit;

and the control circuit is connected with the communication circuit and the sampling circuit and is used for generating a position detection signal according to the voltage signal and outputting the position detection signal through the communication circuit.

2. The battery pack of claim 1, further comprising a first end cap removably connected to the first parallel port; the status display device is integrated on the first end cap; the state display device comprises a third parallel interface, wherein the third parallel interface comprises a power pin and a position detection pin, and the position detection pin is electrically connected with the power pin so as to receive the working voltage provided by the battery pack or other battery packs to which the battery pack is connected.

3. The battery pack according to claim 2, wherein the status display means includes:

the state control unit is connected with the communication pin of the third parallel interface, so as to receive the position detection signal of each battery pack transmitted by the communication pin, and acquire the position relation of each battery pack based on the position detection signal; and

and the display unit is used for displaying the position relation.

4. The battery pack according to claim 3, wherein the state control unit is further configured to obtain and display a state parameter of each battery pack through a communication pin of the third parallel interface.

5. The battery pack according to any one of claims 1 to 4, wherein the control circuit is further configured to receive a position detection signal transmitted from another battery pack through the communication circuit, and acquire a positional relationship of each battery pack with respect to each other based on the position detection signal; the control circuit is also used for outputting the position relation to an accessed battery pack or the state display device through the communication circuit.

6. The battery pack of any one of claims 1-4, wherein the battery pack further comprises a power circuit and a power switch; the first parallel interface also comprises a power supply pin; the power switch is arranged between the power circuit and a power pin of the first parallel machine interface and used for controlling the connection state between the power circuit and the power pin so that the power circuit provides the working voltage to the position detection circuit when the power switch is conducted.

7. The battery pack of claim 1, further comprising: a second end cover detachably connected to the second parallel operation interface; the base is integrated on the second end cap.

8. The battery pack of claim 1 or 7, wherein the base includes a fourth parallel interface and a termination resistor; the position detection pin of the fourth parallel operation interface is grounded; and the terminal resistor is connected with the communication pin of the fourth parallel interface to serve as the terminal resistor of the communication circuit.

9. An energy storage system, comprising:

a plurality of battery packs according to any one of claims 1 to 7; and the plurality of battery packs are connected through the first parallel connection interface or the second parallel connection interface.

10. An energy storage system, comprising:

the base is provided with a fourth parallel operation interface;

the state display device is provided with a third parallel operation interface; and

a plurality of battery packs, the plurality of battery packs being the battery pack of claim 1; the battery packs are connected between the base and the state display device through the first parallel connection interface or the second parallel connection interface.