Battery equalization device and energy storage system

Abstract

The utility model discloses a battery equalization device and an energy storage system, the battery equalization device comprises a box body, a plurality of battery cells, a plurality of receivers, a plurality of emitters and at least one control panel, the plurality of battery cells, the plurality of receivers and the plurality of emitters are all arranged in the box body, the plurality of battery cells are connected in series and / or in parallel, and the plurality of emitters are arranged in the box body. The receiver is arranged at the top of one battery cell and electrically connected with one battery cell, the transmitter is located on the side, away from the battery cell, of the receiver, an electromagnetic field generated by the transmitter is received by the receiver so that the receiver can generate current to charge the battery cell, and the control panel is arranged at the top of the box body and located in the box body. The control panel is used for acquiring electric quantity information of the plurality of battery cells and comparing the acquired electric quantity information of the plurality of battery cells with preset electric quantity information so as to determine a to-be-balanced battery cell, and the control panel is also used for controlling the transmitter to generate an electromagnetic field, so that the receiver generates current so as to wirelessly charge the to-be-balanced battery cell for balancing.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, and in particular to a battery equalization device and an energy storage system. Background Art

[0002] Electricity is a widely used energy source. More and more products use batteries as energy sources or use batteries for energy storage. For example, electric vehicles use battery packs as power sources, and new energy power stations use battery packs to store electricity generated by solar energy and wind energy. These battery packs usually use multiple cells in series and parallel. Different cells will be unbalanced during charging and discharging due to individual differences, resulting in inconsistency of each cell. Such inconsistency will affect the safety of the entire battery pack during use. Therefore, balancing technology that can achieve cell balance in the battery pack has emerged.

[0003] The balancing technologies in related technologies mainly include passive balancing (resistance heating, dissipating the energy of cells with high voltage) and active balancing (energy transfer, transferring the energy of high-voltage cells to low-voltage cells). However, both of the above balancing technologies require the use of actual physical wire harnesses to achieve the electrical connection between the BMS (Battery Management System in English and Battery Management System in Chinese) and the battery pack. Balancing through actual physical wire harnesses results in the balancing of the cells being limited by the wire diameter of the wire harnesses and the heating risk of the BMS, resulting in a relatively small balancing current, which in turn makes the balancing efficiency relatively low and the balancing effect not obvious. Utility Model Content

[0004] The utility model discloses a battery balancing device and an energy storage system, which can realize a wireless balancing function without the need for a balancing harness connection, increase the balancing current, and improve the balancing efficiency.

[0005] In order to achieve the above objectives, in a first aspect, the utility model discloses a battery balancing device, the battery balancing device comprising:

[0006] A box body, the box body comprising a box body and an upper cover, the box body being provided with a receiving groove, and the box body having an opening communicating with the receiving groove, and the upper cover covering the opening;

[0007] A plurality of battery cells, wherein the plurality of battery cells are disposed in the accommodating groove and the plurality of battery cells are connected in series and / or in parallel;

[0008] A plurality of receivers, one of the receivers is disposed on the top of one of the battery cells, and one of the receivers is electrically connected to one of the battery cells;

[0009] A plurality of transmitters are disposed on a side of the upper cover facing the box body, wherein one of the transmitters is located on a side of the receiver away from the battery cell, and an electromagnetic field generated by one of the transmitters is received by one of the receivers; and

[0010] A control board is arranged on a side of the upper cover facing the box body, the control board is used to obtain power information of the multiple battery cells, and to control the transmitter corresponding to the battery cell to be balanced to generate an electromagnetic field, wherein the battery cell to be balanced is configured as: the power information obtained by the control board is less than the preset power information of the battery cell.

[0011] In the battery balancing device provided by the present application, the power information of multiple cells is obtained by using a control board, and the power information of multiple cells obtained is compared with the preset power information to determine the cell to be balanced, and the power of the cell to be balanced is less than the preset power, and then the corresponding transmitter is controlled to generate an electromagnetic field, so that the receiver electrically connected to the cell to be balanced can receive the electromagnetic field, generate current to charge the cell to be balanced, and achieve the effect of balancing. Since the receiver generates electricity by receiving the electromagnetic field generated by the transmitter, the receiver and the transmitter do not need to be electrically connected by a balancing beam, that is, the present application uses wireless charging technology to charge and balance the cells, realizes the wireless balancing function, so that the balancing current is no longer constrained by the wire diameter of the balancing beam, thereby increasing the balancing current and improving the balancing efficiency; at the same time, since the present application adds at least one control board to control the realization of the balancing function, the control of the balancing function is released from the BMS, so that the balancing current is no longer constrained by the heating risk of the BMS, thereby increasing the balancing current and improving the balancing efficiency, and at the same time, it can also reduce the computing power requirements and system complexity of the BMS and improve the focus of the BMS.

[0012] As an optional implementation, in an embodiment of the first aspect of the utility model, the upper cover is provided with a power connection portion electrically connected to the control board, the power connection portion and the control board are respectively located at two opposite sides of the plurality of battery cells in the length direction of the box body, and the control board is connected to the current through the power connection portion; the battery balancing device also includes a power harness and a connecting harness, the power harness and the connecting harness both extend along the length direction, and two ends of the power harness are respectively electrically connected to the power connection portion and the control board, one end of the connecting harness is electrically connected to the control board, and the other end is electrically connected one by one to the plurality of transmitters.

[0013] Through the above design, the layout of the power harness and the connection harness can be made more regular, avoiding the entanglement of the lines, so as to ensure the reliability of the conduction between the lines and facilitate maintenance. At the same time, compared with locating the power connection part and the control board on two opposite sides of the multiple transmitters in the width direction of the box, even if the multiple transmitters in each column of transmitters can be electrically connected to the control board through the same connection harness, since the number of rows of multiple transmitters is usually less than the number of columns, locating the power connection part and the control board on two opposite sides of the multiple transmitters in the length direction of the box, so that the multiple cells in each row of transmitters are electrically connected to the control board through the same connection harness, can reduce the number of connection harnesses and reduce the space occupied by the connection harnesses. At the same time, the number of connection harnesses is reduced, and it is easier to lay out the connection harnesses more regularly, so as to further ensure the reliability of the conduction between the lines and facilitate maintenance.

[0014] As an optional embodiment, in an embodiment of the first aspect of the utility model, the power connection part includes two power contacts arranged at intervals, and the power harness includes two power sub-harnesses, and the two power sub-harnesses are respectively located on two opposite sides of the multiple battery cells in the width direction of the box body, and each of the power sub-harnesses is respectively electrically connected to one of the power contacts and the control board; the number of the connection harnesses is the same as the number of rows of the emitters in the width direction, and each of the connection harnesses includes two connection sub-harnesses, and the two connection sub-harnesses are respectively located on two opposite sides of the multiple emitters arranged in a row along the length direction in the width direction, and one end of each of the connection sub-harnesses is electrically connected to the control board, and the other end is electrically connected one by one to the multiple emitters arranged in a row along the length direction.

[0015] Through the above design, the power supply harness and the connecting harness can be evenly divided on the sides of each row of emitters in the width direction, that is, each row of emitters can be arranged with two harnesses on the sides in the width direction, either two connecting sub-beams, or one connecting sub-beam and one power sub-beam. This can make the layout of the power supply harness and the connecting harness more regular, can more effectively avoid the entanglement of the lines, further ensure the conductivity reliability between the lines, and can make maintenance more convenient.

[0016] As an optional embodiment, in an embodiment of the first aspect of the utility model, the upper cover is provided with a power connection part electrically connected to the control board, the control board is connected to the current through the power connection part, a power socket is provided along the side wall of the box body, a conductive connector is provided inside the power socket, the conductive connector extends outside the power socket to be electrically connected to the battery cell, and the conductive connector is electrically connected to the power connection part.

[0017] Through the above design, the power connection part electrically connected to the control board can be electrically connected to the external power plug through the conductive connector to achieve electrical connection with the external power source, and can also be electrically connected to the battery cell through the conductive connector, so that the control board can be electrically connected to the battery cell, and then the battery cell can also supply power to the control board. Therefore, the current source of the control board can be both the battery balancing device itself and the external power source, enriching the current source of the control board; at the same time, when the control board is powered by the external power source, the control board can share the same power socket with the charging and discharging of the battery cell, thereby reducing the setting of components, simplifying the structure of the battery balancing device, and reducing the cost of the balancing device.

[0018] As an optional implementation, in an embodiment of the first aspect of the utility model, a limiting hole is provided on the end surface of the box body facing the upper cover, the limiting hole is communicated with the interior of the power socket, the power connection portion is passed through the limiting hole, and extends outside the limiting hole to be electrically connected to the power connection, and the power connection portion and the limiting hole are insulated from each other. By providing the limiting hole to cooperate with the power connection portion, the installation position of the power connection portion can be limited by the limiting hole, and the assembly between the upper cover and the box body can be positioned and limited, thereby facilitating the assembly of the upper cover to the box body.

[0019] As an optional implementation, in an embodiment of the first aspect of the utility model, the inner wall of the power socket is provided with an installation fixing groove, one end of the conductive connector is embedded in the installation fixing groove, and the other end of the conductive connector is electrically connected to the battery core. With the above installation method, the installation of the conductive connector can be completed without the aid of additional tools, and the installation process is relatively simple and easy to operate.

[0020] As an optional implementation, in the embodiment of the first aspect of the utility model, a wear-resistant conductive layer is provided on the inner wall of the power socket. The provision of the wear-resistant conductive layer enables the power socket in the present application to have both conductive properties and wear-resistant properties, and has the characteristics of good conductive properties and good wear resistance, thereby improving durability and extending service life.

[0021] As an optional implementation, in the embodiment of the first aspect of the utility model, the receiver is provided with a through installation and fixing hole and an avoidance hole, the pole of the battery cell is inserted through the installation and fixing hole in an interference fit manner, and the projection of the pressure relief valve on the battery cell on the receiver is located in the avoidance hole, so as to avoid the receiver blocking the pressure relief valve on the battery cell, thereby ensuring that the pressure relief valve can release pressure normally. During assembly, the pole of the battery cell can be passed through the installation and fixing hole of the receiver, and can be fixed by pressing the receiver, and the installation and disassembly between the receiver and the battery cell can be completed without the aid of additional tools. The disassembly and assembly process is relatively simple and convenient; and the receiver contacts the pole of the battery cell in an interference fit manner, so that the receiver can be stably fixed on the battery cell, and the contact surface between the receiver and the pole is a good conductive metal layer, such as copper foil, aluminum foil, etc., thereby ensuring the conductivity reliability between the receiver and the pole.

[0022] As an optional implementation, in the embodiment of the first aspect of the utility model, the battery balancing device further includes a busbar connected between two adjacent battery cells, the busbar is provided with two spaced grooves toward the bottom of the battery cell, and in the two adjacent battery cells, the pole of one of the battery cells is embedded in one of the grooves, and the pole of the other battery cell is embedded in the other groove. During assembly, the pole of the battery cell can be embedded in the groove of the busbar and can be fixed by pressing the busbar, and the installation and disassembly between the busbar and the battery cell can be completed without the aid of additional tools, and the disassembly process is relatively simple and convenient.

[0023] In a second aspect, the utility model discloses an energy storage system having a battery balancing device as described in the first aspect. The energy storage system having the battery balancing device as described in the first aspect can also realize wireless balancing function without the need for balancing harness connection, increase balancing current, and improve balancing efficiency.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] The battery balancing device and energy storage system provided by the embodiment of the utility model increase the number of receivers, transmitters and at least one control board that is the same as the number of battery cells, so that the control board can be used to obtain the power information of multiple battery cells, and the obtained power information of the multiple battery cells is compared with the preset power information to determine the battery cell to be balanced. The power of the battery cell to be balanced is less than the preset power, and then the transmitter corresponding to the battery cell to be balanced is controlled to generate an electromagnetic field, so that the receiver electrically connected to the battery cell to be balanced can receive the electromagnetic field, generate current to charge the battery cell to be balanced, and achieve the balancing effect. Since the receiver generates electricity by receiving the electromagnetic field generated by the transmitter, there is no need to use a balancing bundle to achieve electrical connection between the receiver and the transmitter. That is, the present application uses wireless charging technology to charge and balance the battery cells, realizing the wireless balancing function, so that the balancing current is no longer restricted by the wire diameter of the balancing bundle, thereby increasing the balancing current and improving the balancing efficiency; at the same time, since the present application adds at least one additional control board to control the implementation of the balancing function, the control of the balancing function is released from the BMS, so that the balancing current is no longer constrained by the heating risk of the BMS, thereby increasing the balancing current and improving the balancing efficiency. At the same time, it can also reduce the computing power requirements and system complexity of the BMS and improve the focus of the BMS. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a structural schematic diagram of a battery equalization device disclosed in an embodiment of the utility model;

[0028] Figure 2 It is a schematic diagram of the exploded structure of the battery equalization device disclosed in the embodiment of the utility model;

[0029] Figure 3 It is a schematic diagram of the exploded structure of the battery equalization device disclosed in the embodiment of the utility model from another perspective;

[0030] Figure 4 It is a three-dimensional structural schematic diagram of the upper cover disclosed in the embodiment of the utility model;

[0031] Figure 5 It is a schematic diagram of the planar structure of the upper cover disclosed in the embodiment of the utility model;

[0032] Figure 6 It is a structural schematic diagram of the battery equalization device disclosed in the embodiment of the utility model from another perspective;

[0033] Figure 7 It is a structural schematic diagram of a battery equalization device disclosed in an embodiment of the utility model without showing an upper cover;

[0034] Figure 8 It is a structural schematic diagram of the box body disclosed in the embodiment of the utility model;

[0035] Fig. 9 yes Figure 8 A local enlarged view of point A in FIG.

[0036] Fig.10 It is a schematic diagram of the structure of the receiver and the battery cell disclosed in the embodiment of the utility model;

[0037] Fig.11 It is a structural schematic diagram of a transmitter disclosed in an embodiment of the utility model;

[0038] Fig.12 This is a first structural schematic diagram of the energy storage system disclosed in the embodiment of the utility model;

[0039] Fig.13 This is a second structural schematic diagram of the energy storage system disclosed in the embodiment of the utility model.

[0040] Description of main reference numerals

[0041] 100-battery balancing device; 11-box; 11a-box body; 11a1-accommodating groove; 11a2-opening; 11a3-limiting hole; 11b-upper cover; 111-power connection part; 1111-power contact; 112-power socket; 1121-installation fixing groove; 113-conductive connector; 12-battery core; 121-pole; 122-pressure relief valve; 13-receiver; 131-installation fixing hole; 132-avoidance hole; 14-transmitter; 15-control board; 16-power harness; 161-power sub-harness; 17-connection harness; 171-connection sub-harness; 18-bus; 181-groove;

[0042] f1-length direction; f2-width direction;

[0043] 200 - energy storage system; 201 - electric energy conversion device; 202 - first user load; 203 - second user load; 210 - high voltage cable; 220 - first electric energy conversion device; 230 - second electric energy conversion device. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0046] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0047] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0048] Electricity is a widely used energy source. More and more products use batteries as energy sources or use batteries for energy storage. For example, electric vehicles use battery packs as a power source, and new energy power stations use battery packs to store electricity generated by solar energy and wind energy. These battery packs usually use multiple cells connected in series and parallel.

[0049] Since the manufacturing, initial capacity, voltage, internal resistance and temperature of each battery cell are not exactly the same, overcharging and over-discharging of a certain battery cell may occur during use. During the discharge process, the capacity of an individual battery cell is lower than that of other batteries, and its power is discharged first. At the same time, due to the low voltage of the battery cell, it loses the ability to discharge. At this time, it becomes an electrical appliance. The other batteries with capacity are connected in series to charge it, resulting in the reverse polarity of the battery cell, which makes the entire battery pack unable to work normally and has a great impact on the life of the reverse polarity battery cell. In addition, during the charging process, the battery cell that is discharged first will be filled first, which will cause overcharging, so that the entire battery pack cannot be fully charged normally. In fact, the actual discharged capacity in a battery pack is determined by the battery cell with the smallest actual capacity, that is, when the capacity of the battery cell is exhausted, the other batteries cannot continue to work. The same is true during the charging process. Therefore, the imbalance between battery cells is a very harmful factor affecting the operation of the battery pack. It is very necessary to balance the battery pack, so the balancing technology that can achieve the balance of battery cells in the battery pack came into being.

[0050] The balancing technologies in related technologies mainly include passive balancing (resistance heating, dissipating the energy of cells with high voltage) and active balancing (energy transfer, transferring the energy of high-voltage cells to low-voltage cells). However, both of the above balancing technologies require the use of actual physical wire harnesses to achieve the electrical connection between the BMS (Battery Management System in English, Battery Management System in Chinese) and the battery pack. Balancing is performed through actual physical wire harnesses. On the one hand, since the wire diameter of the wire harness is usually small and cannot transmit large current for a long time, the balancing current is limited by the wire diameter of the wire harness and is usually small. On the other hand, in order to reduce the heating risk of the BMS, a larger balancing current cannot be used. Therefore, the balancing current is limited by the heating risk of the BMS and is usually small, which makes the balancing efficiency relatively low and the balancing effect is not obvious.

[0051] In view of this, the present application provides a battery balancing device and an energy storage system in which the balancing current is no longer limited by the wire diameter of the balancing harness and the heating risk of the BMS. The battery balancing device can have a larger balancing current, thereby improving the balancing efficiency.

[0052] The technical solution of the present application will be further described in detail below with reference to the accompanying drawings.

[0053] See also Figures 1 to 3 The embodiment of the first aspect of the utility model discloses a battery balancing device, the battery balancing device 100 comprises a box 11, a plurality of battery cells 12 arranged inside the box 11, a plurality of receivers 13, a plurality of transmitters 14 and at least one control board 15. The plurality of battery cells 12 are connected in series and / or in parallel, that is, the plurality of battery cells 12 can be connected in series with each other, or the plurality of battery cells 12 can be connected in parallel with each other, or a part of the battery cells 12 can be connected in series with each other, and another part of the battery cells 12 can be connected in parallel with each other. A receiver 13 is arranged on the top of a battery cell 12, and the receiver 13 is electrically connected to the battery cell 12, a transmitter 14 is located on a side of the receiver 13 away from the battery cell 12, and the electromagnetic field generated by the transmitter 14 is received by the receiver 13, so that the receiver 13 can generate current to charge the battery cell 12 electrically connected to the receiver 13. In other words, the number of receivers 13 and transmitters 14 depends on the number of battery cells 12 . One battery cell 12 corresponds to one receiver 13 and one transmitter 14 , so that one receiver 13 can receive the electromagnetic field generated by one transmitter 14 to charge one battery cell 12 .

[0054] The control board 15 in the present application is arranged at the top of the box 11, and the control board 15 is used to obtain the power information of multiple cells 12, and compare the obtained power information of multiple cells 12 with the preset power information to determine the cells 12 to be balanced, and the control board 15 is also used to control the transmitter 14 corresponding to the cells to be balanced to generate an electromagnetic field, so that the receiver 13 arranged on the cells to be balanced generates a current to wirelessly charge the cells to be balanced for balancing. Among them, the cells 12 to be balanced are configured as: the power information obtained by the control board 15 is less than the preset power information. Specifically, during use, when the control board 15 obtains that the power information of a certain cell 12 is lower than the preset power information, the cell 12 is determined as the cell 12 to be balanced, and the transmitter 14 corresponding to the cell 12 to be balanced is controlled to generate an electromagnetic field, at which time the receiver 13 arranged on the cell 12 to be balanced can receive the electromagnetic field and generate a current, so that the cell 12 to be balanced can be charged and balanced.

[0055] In the above-mentioned balancing process, since the receiver 13 generates electricity by receiving the electromagnetic field generated by the transmitter 14 and transmits energy through the magnetic field, the receiver 13 and the transmitter 14 do not need to use a balancing beam to achieve electrical connection, that is, the present application uses wireless charging technology to charge and balance the battery cell 12, and realizes the wireless balancing function, so that the balancing current is no longer restricted by the wire diameter of the balancing beam, thereby increasing the balancing current and improving the balancing efficiency; at the same time, since the present application adds at least one control board 15 to control the realization of the balancing function, the control of the balancing function is released from the BMS, so that the balancing current is no longer constrained by the heating risk of the BMS, thereby increasing the balancing current and improving the balancing efficiency. At the same time, it can also reduce the computing power requirements and system complexity of the BMS and improve the focus of the BMS.

[0056] At the same time, since there is no need to add an additional balancing harness to achieve electrical connection between the receiver 13 and the transmitter 14, the problem of heating of the balancing harness can be eliminated; at the same time, since the size of the balancing current is no longer restricted by the size of the balancing harness and the heating problem of the BMS, the size of the balancing current can be designed according to the capacity of the battery cell 12, and large current rapid balancing can be achieved, so that balancing can be completed quickly.

[0057] In the present application, the control board 15 and the transmitter 14 can be connected and communicated wirelessly or by wire. Optionally, the control board 15 and the transmitter 14 can communicate via power line communication (PLC for short). Similarly, the control board 15 and the battery cell 12 can be connected and communicated wirelessly or by wire.

[0058] In the present application, the transmitter 14 includes a first coil and a power amplifier electrically connected to each other. When the power is turned on, the current passes through the first coil so that the first coil can generate an electromagnetic field, and the function of the power amplifier is to increase the intensity of the current to enhance the intensity and range of the magnetic field. The receiver 13 may include a second coil and a rectifier electrically connected to each other. When the second coil of the receiver 13 is placed within the electromagnetic field range of the transmitter 14, an induced current will be generated in the second coil according to the principle of electromagnetic induction, and the function of the rectifier is to convert the induced current from alternating current to direct current to meet the charging requirements of the battery cell 12.

[0059] It can be understood that the balancing current is also the above-mentioned induced current, and the above-mentioned induced current is generated by the cooperation of the second coil and the first coil. Therefore, the size of the balancing current is determined by the size, shape, material, etc. of the associated coils (that is, the first coil and the second coil). While ensuring heat dissipation safety, the size of the balancing current can be set as required.

[0060] In this application, if Figure 2 and Figure 3 As shown, multiple battery cells 12 can be arranged in a matrix along the length direction f1 and the width direction f2 of the box body 11, then multiple receivers 13 are also arranged in a matrix along the length direction f1 and the width direction f2 of the box body 11, and multiple transmitters 14 are also arranged in a matrix along the length direction f1 and the width direction f2 of the box body 11. For example, multiple transmitters 14 can be arranged along the length direction f1 to form a matrix of multiple rows of transmitters 14 and along the width direction f2 to form multiple columns of transmitters 14, and the number of transmitters 14 arranged along the length direction f1 to form a row of transmitters 14 is greater than the number of battery cells 12 arranged along the width direction f2 to form a column of transmitters 14, that is, the number of transmitters 14 in each row of transmitters 14 is greater than the number of transmitters 14 in each column of transmitters 14, then the number of rows of multiple transmitters 14 is less than the number of columns.

[0061] In some optional embodiments, such as Figure 3 , Figure 4 and Figure 5 As shown, the box 11 is provided with a power connection portion 111 electrically connected to the control board 15, the power connection portion 111 and the control board 15 are respectively located at two opposite sides of the multiple transmitters 14 in the length direction f1, and the control board 15 is connected to the current through the power connection portion 111 to realize power supply to the control board 15. In addition, the battery balancing device in the present application also includes a power harness 16 and a connecting harness 17, the power harness 16 and the connecting harness 17 both extend along the length direction f1, and the two ends of the power harness 16 are electrically connected to the power connection portion 111 and the control board 15, respectively, one end of the connecting harness 17 is electrically connected to the control board 15, and the other end is electrically connected to the multiple transmitters 14 one by one.

[0062] Through the above design, the layout of the power harness 16 and the connection harness 17 can be made more regular, and the lines can be prevented from being entangled, so as to ensure the reliability of the conduction between the lines and facilitate maintenance. At the same time, compared with the power connection part 111 and the control board 15 being respectively located on two opposite sides of the multiple emitters 14 in the width direction f2 of the box body 11, even if the multiple emitters 14 in each column of emitters 14 can be electrically connected to the control board 15 through the same connection harness 17, since the number of rows of the multiple emitters 14 is less than the number of columns, the power connection part 111 and the control board 15 are respectively located on two opposite sides of the multiple emitters 14 in the length direction f1, so that the multiple emitters 14 in each row of emitters 14 are electrically connected to the control board 15 through the same connection harness 17, which can reduce the number of connection harnesses 17 and reduce the space occupied by the connection harnesses 17. At the same time, the number of connection harnesses 17 is reduced, and it is easier to lay out the connection harnesses 17 more regularly, so as to further ensure the reliability of the conduction between the lines and facilitate maintenance.

[0063] In some optional embodiments, the power connection portion 111 may include two power contacts 1111 arranged at intervals, and the power beam 16 includes two power sub-beams 161, which are respectively located on two opposite sides of the multiple emitters 14 in the width direction f2, and each power sub-beam 161 is electrically connected to a power contact 1111 and the control board 15; the number of connection beams 17 is the same as the number of columns of the emitters 14 in the width direction f2, and each connection beam 17 includes two connection sub-beams 171, which are respectively located on two opposite sides of the multiple emitters 14 arranged in a row along the length direction f1 in the width direction f2, and one end of each connection sub-beam 171 is electrically connected to the control board 15, and the other end is electrically connected one by one to the multiple emitters 14 arranged in a row along the length direction f1.

[0064] For example, in Figure 4 and Figure 5 In the illustrated embodiment, a plurality of emitters 14 are arranged in a 2*4 array along the length direction f1 and the width direction f2, and the battery balancing device includes two connecting harnesses 17, each connecting harness 17 includes two connecting sub-beams 171, wherein the two connecting sub-beams 171 of one connecting harness 17 are respectively located at two opposite sides of one row of emitters 14 in the width direction f2, and one end of each connecting sub-beam 171 of the connecting harness 17 is electrically connected to the control board 15, and the other end is electrically connected one by one to the plurality of emitters 14 in the row of emitters 14; the two connecting sub-beams 171 of another connecting harness 17 are respectively located at two opposite sides of another row of emitters 14 in the width direction f2, and one end of each connecting sub-beam 171 of the connecting harness 17 is electrically connected to the control board 15, and the other end is electrically connected one by one to the plurality of emitters 14 in the row of emitters 14.

[0065] Through the above design, the power supply harness 16 and the connecting harness 17 can be evenly distributed on the side of each row of emitters 14 in the width direction f2, that is, each row of emitters 14 can be arranged with two harnesses on the side in the width direction f2, either two connecting sub-beams 171, or one connecting sub-beam 171 and one power sub-beam 161. In this way, the layout of the power supply harness 16 and the connecting harness 17 can be more regular, the entanglement of the lines can be more effectively avoided, the conductivity reliability between the lines can be further ensured, and maintenance can be more convenient.

[0066] In some optional embodiments, combined with Figures 2 to 5 As shown, in order to facilitate the assembly of the battery balancing device 100, the box body 11 includes a box body 11a and an upper cover 11b. The box body 11a is provided with a receiving groove 11a1, and the box body 11a has an opening 11a2 communicated with the receiving groove 11a1, and the upper cover 11b covers the opening 11a2. A plurality of battery cells 12 are arranged in the receiving groove 11a1, and the power connection part 111, the control board 15, the power harness 16, the connection harness 17 and the plurality of transmitters 14 are all arranged on the upper cover 11b.

[0067] Exemplarily, the upper cover 11b can be made of a material with good thermal conductivity, such as copper or silver, or the surface of the upper cover 11b can be plated with copper or silver to ensure that the electronic components on the control board 15 and the transmitter 14 can dissipate heat well. The control board 15 and the transmitter 14 are fixed to the upper cover 11b by gluing or grooving. Both the power harness 16 and the connecting harness 17 can use insulated and high-temperature resistant harnesses, and the power harness 16 and the connecting harness 17 can be fixed to the upper cover 11b by gluing, or a plurality of wiring grooves are provided on the upper cover 11b, and the power harness 16 and the connecting harness 17 are respectively embedded in the corresponding wiring grooves to be fixed to the upper cover 11b.

[0068] See also Figures 5 to 7 The upper cover 11b in the present application is provided with a power connection part 111 electrically connected to the control board 15, and the control board 15 is connected to the current through the power connection part 111. A power socket 112 is provided along the side wall of the box body 11a, and a conductive connector 113 is provided inside the power socket 112. The conductive connector 113 extends outside the power socket 112 and is electrically connected to the battery 12, and the conductive connector 113 is electrically connected to the power connection part 111. The jack of the power socket 112 is used for inserting an external power plug so that the power plug is electrically connected to the conductive connector 113, so that the power plug can be electrically connected to the battery 12 and the control board 15, and then the external power supply can be connected to the power plug to realize charging of the battery 12 and power supply to the control board 15, or the external charging device can be connected to the charging device through the power plug to realize charging of the charging device.

[0069] It can be understood that the power connection part 111 electrically connected to the control board 15 can be electrically connected to the external power plug through the conductive connector 113 to achieve electrical connection with the external power source. Since the conductive connector 113 is electrically connected to the battery cell 12, the power connection part 111 electrically connected to the control board 15 can also be electrically connected to the battery cell 12 through the conductive connector 113, so that the control board 15 can be electrically connected to the battery cell 12, and then the battery cell 12 can also supply power to the control board 15. Therefore, through the above design, the current source of the control board 15 can be both the battery balancing device 100 itself and the external power source, enriching the current source of the control board 15; at the same time, when the control board 15 is powered by the external power source, the control board 15 can share the same power socket 112 with the charging and discharging of the battery cell 12, thereby reducing the setting of components, simplifying the structure of the battery balancing device 100, and reducing the cost of the balancing device.

[0070] In some optional embodiments, combined with Figures 6 to 9 As shown, a limiting hole 11a3 is provided on the end surface of the box body 11a facing the upper cover 11b, and the limiting hole 11a3 is communicated with the inside of the power socket 112. The power connection part 111 is penetrated through the limiting hole 11a3 and extends to the outside of the limiting hole 11a3 to be electrically connected to the power connection, and the power connection part 111 and the limiting hole 11a3 are insulated from each other. By providing the limiting hole 11a3 to cooperate with the power connection part 111, the installation position of the power connection part 111 can be limited by the limiting hole 11a3, and the assembly between the upper cover 11b and the box body 11a can be positioned and limited, so that it is convenient to assemble the upper cover 11b to the box body 11a.

[0071] Exemplarily, an insulating material is provided on the outer peripheral surface of the power connection part 111, for example, an insulating tape is wrapped around the outer peripheral surface of the power connection part 111, or an insulating layer is electroplated on the outer peripheral surface of the power connection part 111, and / or an insulating material is provided on the inner wall of the limiting hole 11a3, for example, an insulating layer is electroplated on the inner wall of the limiting hole 11a3, thereby realizing an insulation setting between the power connection part 111 and the limiting hole 11a3.

[0072] In this embodiment, there may be two limiting holes 11a3, and there may be two conductive connectors 113. The two conductive connectors 113 are respectively electrically connected to different battery cells, and the two conductive connectors 113 are respectively connected to the positive and negative poles of different battery cells 12. One power contact 1111 is passed through one of the limiting holes 11a3 and extends to the outside of one of the limiting holes 11a3 to be electrically connected to one of the conductive connectors 113. Another power contact 1111 is also passed through another limiting hole 11a3 and extends to the outside of the other limiting hole 11a3 to be electrically connected to the other conductive connector 113.

[0073] In some optional embodiments, the inner wall of the power socket 112 is provided with a mounting and fixing groove 1121, one end of the conductive connector 113 is embedded in the mounting and fixing groove 1121, and the other end of the conductive connector 113 is electrically connected to the battery cell 12. With the above-mentioned installation method, the installation of the conductive connector 113 can be completed without the aid of additional tools, and the installation process is relatively simple and easy to operate.

[0074] In some optional embodiments, a wear-resistant conductive layer (not shown) is provided on the inner wall of the power socket 112. For example, a layer of wear-resistant and highly conductive metal material is electroplated on the inner wall of the power socket 112 to form the wear-resistant conductive layer. This allows the power socket 112 in the present application to have both conductive properties and wear-resistant properties, and has the characteristics of good conductive properties and good wear resistance, thereby improving durability and extending service life.

[0075] In some optional embodiments, such as Fig.10 As shown, the receiver 13 is provided with a through installation and fixing hole 131 and an avoidance hole 132, the pole 121 of the battery cell 12 is inserted into the installation and fixing hole 131 with interference fit, and the projection of the pressure relief valve 122 on the battery cell 12 on the receiver 13 is located in the avoidance hole 132, so as to avoid the receiver 13 blocking the pressure relief valve 122 on the battery cell 12, thereby ensuring that the pressure relief valve 122 can release pressure normally. During assembly, the pole 121 of the battery cell 12 can be passed through the installation and fixing hole 131 of the receiver 13, and can be fixed by pressing the receiver 13. The installation and disassembly between the receiver 13 and the battery cell 12 can be completed without the help of additional tools. The disassembly process is relatively simple and easy to disassemble and assemble. In addition, the receiver 13 contacts the pole 121 of the battery cell 12 in an interference contact manner, which can stably fix the receiver 13 on the battery cell 12. The contact surface between the receiver 13 and the pole 121 is a good conductive metal layer, such as copper foil, aluminum foil, etc., thereby ensuring the conductivity reliability between the receiver 13 and the pole.

[0076] In some optional embodiments, such as Fig.10 and Fig.11As shown, the battery equalization device also includes a busbar 18 connected between two adjacent cells 12, and the busbar 18 is provided with two spaced grooves 181 toward the bottom of the cell 12. In the two adjacent cells 12, the pole 121 of one cell 12 is embedded in one of the grooves 181, and the pole 121 of the other cell 12 is embedded in the other groove 181, and the receiver 13 is located between the busbar 18 and the cell 12. During assembly, the pole of the cell 12 can be embedded in the groove 181 of the busbar 18, and can be fixed by pressing the busbar 18. The installation and disassembly between the busbar 18 and the cell 12 can be completed without the aid of additional tools. The disassembly process is relatively simple and convenient; and the contact surface between the busbar 18 and the pole 121 is a good conductive metal layer, such as copper foil, aluminum foil, etc., so as to ensure the conductivity reliability between the busbar 18 and the pole.

[0077] The embodiment of the second aspect of the present invention discloses an energy storage system having a battery balancing device as described above. It can be understood that the energy storage system having the battery balancing device as described above can also bring the same or similar beneficial effects as the battery balancing device. For details, please refer to the description of the embodiment of the battery balancing device, which will not be repeated here.

[0078] For an example, see Fig.12 , Fig.12 This is a schematic diagram of the structure of a household energy storage system according to an embodiment of the present application. Fig.12 The household energy storage scenario in user-side energy storage is taken as an example for explanation, but the energy storage system in this application is not limited to the household energy storage scenario.

[0079] like Fig.12 As shown, the energy storage system 200 in the present application may include an electric energy conversion device 201 (e.g., a photovoltaic panel), a first user load 202 (e.g., a street lamp), a second user load 203 (e.g., household appliances such as air conditioners, etc.), and the battery balancing device 100 described above, which may be a small energy storage box that can be mounted on an outdoor wall by wall-mounting. Specifically, the photovoltaic panel can convert solar energy into electric energy during the period of low electricity prices, and the battery balancing device 100 is used to store the electric energy and supply it to street lamps and household appliances for use during the peak electricity prices, or to supply power when the power grid is out of power / power outage.

[0080] For another example, see Fig.13 , Fig.13 is a schematic diagram of the structure of an energy storage system according to another embodiment of the present application, and the present application Fig.13 The shared energy storage scenario on the generation / distribution side is taken as an example for explanation, but the energy storage device of the present application is not limited to the energy storage scenario on the generation / distribution side.

[0081] like Fig.13 As shown, the energy storage system 200 in the present application may include a high-voltage cable 210, a first power conversion device 220, a second power conversion device 230 and the battery balancing device 100 described above. In the case of power generation, the first power conversion device 220 and the second power conversion device 230 are used to convert other forms of energy into electric energy, which is connected to the high-voltage cable 210 and supplied to the power distribution network for use. When the power load is low and the first power conversion device 220 and the second power conversion device 230 generate excess power, the excess power is stored in the battery balancing device 100, thereby reducing the wind and solar power abandonment rates and improving the problem of new energy power generation and consumption. When the power load is high, the power grid issues an instruction to use the power stored in the battery balancing device 100 in conjunction with the high-voltage cable 210 to transmit electric energy to the power consumption side in a grid-connected mode, thereby providing peak load regulation, frequency regulation, standby and other services for the operation of the power grid, giving full play to the peak load regulation of the power grid, promoting peak load shaving and valley filling of the power grid, and alleviating the power supply pressure of the power grid.

[0082] Optionally, the first electric energy conversion device 220 and the second electric energy conversion device 230 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy and mechanical energy into electric energy.

[0083] Optionally, the number of battery balancing devices 100 can be multiple, and multiple battery balancing devices 100 are connected in series or in parallel. Multiple battery balancing devices 100 are supported and electrically connected by isolation plates (not shown). In this embodiment, "multiple" refers to two or more. An energy storage box can also be provided outside the battery balancing device 100 to accommodate the battery balancing device 100.

[0084] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] In addition, the above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the content of this specification should not be understood as limiting the present application, and the protection scope of the present application shall be subject to the attached claims.

Claims

1. A battery balancing device, characterized in that: The battery balancing device comprises: A box body, the box body comprising a box body and an upper cover, the box body being provided with a receiving groove, and the box body having an opening communicating with the receiving groove, and the upper cover covering the opening; A plurality of battery cells, wherein the plurality of battery cells are disposed in the accommodating groove and the plurality of battery cells are connected in series and / or in parallel; A plurality of receivers, one of the receivers is disposed on the top of one of the battery cells, and one of the receivers is electrically connected to one of the battery cells; A plurality of transmitters are disposed on a side of the upper cover facing the box body, wherein one of the transmitters is located on a side of the receiver away from the battery cell, and an electromagnetic field generated by one of the transmitters is received by one of the receivers; and A control board is arranged on a side of the upper cover facing the box body, the control board is used to obtain power information of the multiple battery cells, and to control the transmitter corresponding to the battery cell to be balanced to generate an electromagnetic field, wherein the battery cell to be balanced is configured as: the power information obtained by the control board is less than the preset power information of the battery cell.

2. The battery equalization device according to claim 1, characterized in that: The upper cover is provided with a power connection portion electrically connected to the control board, the power connection portion and the control board are respectively located at two opposite sides of the plurality of cells in the length direction of the box body, and the control board is connected to the current through the power connection portion; The battery balancing device also includes a power harness and a connecting harness, both of which extend along the length direction, and two ends of the power harness are electrically connected to the power connection portion and the control board respectively, one end of the connecting harness is electrically connected to the control board, and the other end is electrically connected to the multiple transmitters one by one.

3. The battery equalization device according to claim 2, characterized in that: The power connection portion includes two power contacts arranged at intervals, the power harness includes two power sub-harnesses, the two power sub-harnesses are respectively located at two opposite sides of the plurality of emitters in the width direction of the box, and each of the power sub-harnesses is respectively electrically connected to one of the power contacts and the control board; The number of the connecting beams is the same as the number of rows of the emitters in the width direction, and each of the connecting beams includes two connecting sub-beams, which are respectively located on two opposite sides of the plurality of emitters arranged in a row along the length direction in the width direction, and one end of each of the connecting sub-beams is electrically connected to the control board, and the other end is electrically connected one by one to the plurality of emitters arranged in a row along the length direction.

4. The battery equalization device according to claim 1, characterized in that: The upper cover is provided with a power connection part electrically connected to the control board, and the control board is connected to the current through the power connection part. The box body is provided with a power socket along the side wall, and a conductive connector is provided inside the power socket. The conductive connector extends outside the power socket and is electrically connected to the battery cell, and the conductive connector is electrically connected to the power connection part.

5. The battery equalization device according to claim 4, characterized in that: A limiting hole is provided on the end surface of the box body facing the upper cover, and the limiting hole is communicated with the interior of the power socket. The power connection part is passed through the limiting hole and extends outside the limiting hole to be electrically connected to the power connection, and the power connection part and the limiting hole are insulated from each other.

6. The battery equalization device according to claim 4, characterized in that: An inner wall of the power socket is provided with a mounting and fixing groove, one end of the conductive connecting member is embedded in the mounting and fixing groove, and the other end of the conductive connecting member is electrically connected to the battery core.

7. The battery equalization device according to claim 4, characterized in that: A wear-resistant conductive layer is arranged on the inner wall of the power socket.

8. The battery balancing device according to any one of claims 1 to 7, characterized in that: The receiver is provided with a through installation and fixing hole and an avoidance hole, the pole of the battery cell is inserted into the installation and fixing hole with interference fit, and the projection of the pressure relief valve on the battery cell on the receiver is located in the avoidance hole.

9. The battery balancing device according to any one of claims 1 to 7, characterized in that: The battery balancing device also includes a busbar connected between two adjacent battery cells, wherein the busbar is provided with two spaced grooves toward the bottom of the battery cell, and in the two adjacent battery cells, the pole of one of the battery cells is embedded in one of the grooves, and the pole of the other battery cell is embedded in the other groove.

10. An energy storage system, characterized in that: The energy storage system comprises a battery balancing device as claimed in any one of claims 1 to 9.

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