Electricity storage device and electric equipment

Abstract

The utility model relates to an electricity storage device and electric equipment, the electricity storage device comprises a plurality of battery cell modules, the electricity storage device has a first working mode and a second working mode, and in the first working mode, any one of the plurality of battery cell modules is independently charged or discharged; and in the second working mode, a part of the plurality of battery cell modules are connected in series into a whole for charging or discharging, or all the battery cell modules are connected in series into a whole for charging or discharging. According to the arrangement, the power storage device is in different working modes, so that the power storage device can be suitable for charging platforms with different charging voltages, discharging with different voltages can be carried out at the same time, space can be saved, and the energy density of the energy storage device can be improved.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular, to an electricity storage device and an electricity-consuming device. Background Art

[0002] A power storage device (such as a battery pack) is a device used to provide energy to electrical equipment (such as a vehicle) and is a core component of the electrical equipment. For a specific electrical equipment (such as a vehicle), once the battery pack is installed, it is usually only applicable to a fixed charging voltage and is not compatible with charging platforms of different voltages. Utility Model Content

[0003] The purpose of the present disclosure is to provide an electricity storage device and an electricity-consuming device to at least partially solve the technical problems existing in the related art.

[0004] In order to achieve the above-mentioned object, according to a first aspect of the present disclosure, there is provided a power storage device, comprising a plurality of battery cell modules, wherein the power storage device has a first working mode and a second working mode;

[0005] In the first working mode, any one of the plurality of battery modules is charged or discharged individually;

[0006] In the second working mode, some of the plurality of battery modules are connected in series as a whole for charging or discharging, or all of the plurality of battery modules are connected in series as a whole for charging or discharging;

[0007] The multiple battery cell modules are arranged in a box of a single power storage device.

[0008] Optionally, the power storage device is suitable for charging or discharging at a voltage of 400V to 800V.

[0009] Optionally, the power storage device further includes a switch, and the switch is arranged on the series circuit where the multiple battery cell modules are located.

[0010] Optionally, the number of the battery cell modules is an even number.

[0011] Optionally, the power storage device further includes a current fuse, and the current fuse is arranged on the series circuit where the multiple battery cell modules are located.

[0012] Optionally, the power storage device further includes at least one insulating member, and the insulating member is arranged between two adjacent battery cell modules.

[0013] Optionally, the positive electrodes and negative electrodes of the battery cell modules in the plurality of battery cell modules are located on the same side of the power storage device.

[0014] Optionally, the plurality of battery cell modules are arranged along the width direction of the power storage device, and each of the battery cell modules includes at least one battery cell group;

[0015] The cells in each cell group extend along the length direction of the power storage device;

[0016] The positive electrodes and negative electrodes of the battery cell modules in the plurality of battery cell modules are located on the same side in the length direction of the power storage device.

[0017] Optionally, each of the battery cell groups includes a plurality of rows of battery cells arranged along the length direction of the power storage device, and each row of battery cells includes a plurality of battery cells arranged along the width direction of the power storage device;

[0018] In the same battery cell group, the battery cells in each row are connected in series, and the battery cells in two adjacent rows are connected in series.

[0019] Optionally, each of the battery cell modules includes a plurality of battery cell columns, each battery cell column includes a plurality of battery cells arranged along the length direction of the power storage device, and the plurality of battery cell columns are arranged along the width direction of the power storage device;

[0020] A plurality of battery cells in each battery cell column are connected in series, and two adjacent battery cell columns are connected in series.

[0021] Optionally, the number of the plurality of battery cell modules is two, namely a first battery cell module and a second battery cell module;

[0022] The first battery cell module is arranged adjacent to the second battery cell module, and a switch is provided on the circuit between the negative electrode of the first battery cell module and the positive electrode of the second battery cell module.

[0023] Optionally, the two battery cell modules are arranged symmetrically.

[0024] Optionally, the two battery cell modules are arranged symmetrically about a midline in a width direction of the power storage device.

[0025] Optionally, the power storage device further includes a first conductive member and a second conductive member;

[0026] The first conductive member is connected to the positive electrode of the first battery cell module to serve as a positive electrode lead-out member of the first battery cell module;

[0027] The second conductive member is connected to the negative electrode of the first battery cell module to serve as a negative electrode lead-out member of the first battery cell module.

[0028] Optionally, the power storage device further includes a third conductive member and a fourth conductive member;

[0029] The third conductive member is connected to the positive electrode of the second battery cell module to serve as a positive electrode lead-out member of the second battery cell module;

[0030] The fourth conductive member is connected to the negative electrode of the second battery cell module to serve as a negative electrode lead-out member of the second battery cell module;

[0031] The switch and / or current fuse is also arranged on the circuit between the second conductive member and the third conductive member.

[0032] Optionally, the first battery cell module and the second battery cell module are arranged along the width direction of the power storage device;

[0033] The first conductive member, the second conductive member, the third conductive member and the fourth conductive member are located on the same side of the length direction of the power storage device;

[0034] In the width direction of the power storage device, the second conductive member is located between the first conductive member and the fourth conductive member, and the third conductive member is also located between the first conductive member and the fourth conductive member.

[0035] Optionally, the first battery cell module includes two battery cell groups arranged in a width direction of the power storage device and connected in series, and the second battery cell module includes two battery cell groups arranged in a width direction of the power storage device and connected in series;

[0036] The first conductive member is connected to the positive electrode of the battery cell group located on the outside in the width direction of the first battery cell module;

[0037] The second conductive member is connected to the negative electrode of the battery cell group located on the inner side in the width direction of the first battery cell module;

[0038] The third conductive member is connected to the positive electrode of the battery cell group located on the inner side in the width direction of the second battery cell module;

[0039] The fourth conductive member is connected to the negative electrode of the cell group located on the outside in the width direction of the second cell module.

[0040] Optionally, the first battery cell module and the second battery cell module unit each include a plurality of battery cell columns, each battery cell column includes a plurality of battery cells arranged along the length direction of the power storage device, and the plurality of battery cell columns are arranged along the width direction of the power storage device;

[0041] A plurality of battery cells in each battery cell column are connected in series, and two adjacent battery cell columns are connected in series.

[0042] Optionally, the first conductive member is connected to the outermost battery cell row in the first battery cell module in the width direction of the power storage device;

[0043] The second conductive member is connected to the innermost battery cell row in the first battery cell module in the width direction of the power storage device;

[0044] The third conductive member is connected to the innermost battery cell row in the second battery cell module in the width direction of the power storage device;

[0045] The fourth conductive member is connected to the outermost battery cell row in the second battery cell module in the width direction of the power storage device.

[0046] According to a second aspect of the present disclosure, there is provided an electrical device, comprising a device body and the power storage device, wherein the power storage device is installed on the device body and is used to supply power to the device body.

[0047] Optionally, the electrical equipment is a vehicle, the power storage device is a battery pack, and the equipment body is the body of the vehicle.

[0048] In this way, when the power storage device is in the first working mode, any one of the multiple battery modules is charged separately. At this time, the power storage device can be applied to a charging platform with a lower charging voltage, so that it can have a conventional charging mode; when the power storage device is in the second working mode, that is, when some or all of the multiple battery modules are connected in series, the power storage device can be applied to a charging platform with a higher charging voltage, so that it can have a fast charging mode. Therefore, compared with the solution in the related art that the power storage device can only be charged using a charging platform with a fixed voltage, the power storage device provided by the present disclosure can have a charging platform suitable for different voltages, that is, it can be compatible with voltage platforms of multiple voltages, which is conducive to convenient daily use.

[0049] Furthermore, since the multiple battery cell modules in the energy storage device can have different operating modes, the number of battery cell modules being discharged can be different in different operating modes. Therefore, different discharge modes can be provided, and power supply modes with different voltages can be provided to the electric drive components of the electrical equipment (such as the motor of a vehicle).

[0050] In addition, since multiple battery modules are placed in a single box, there is no need to arrange a box for each battery module, and multiple battery modules can share components (such as heat exchange structures), thus saving space and improving the energy density of the energy storage device. Taking the battery pack as an example, a single box in the battery pack can hold multiple battery modules, which can save space in the battery pack and help improve the energy density of the battery pack.

[0051] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0053] Figure 1 is a three-dimensional structural schematic diagram of a partial structure of a power storage device provided by an exemplary embodiment of the present disclosure, wherein a power distribution unit is not shown;

[0054] Figure 2 yes Figure 1 A magnified schematic diagram of part A;

[0055] Figure 3 An exemplary embodiment of the present disclosure provides an arrangement of multiple conductive members for connecting battery modules and power distribution units in series in a power storage device;

[0056] Figure 4 yes Figure 3 Schematic diagram of the cell group wiring at the transfer bend in the middle B part;

[0057] Figure 5 It is an arrangement of multiple battery cell modules in a power storage device provided by an exemplary embodiment of the present disclosure, wherein four battery cell groups, a first battery cell module and a second battery cell module are schematically shown by frame lines;

[0058] Figure 6 is a schematic diagram of a three-dimensional structure of an electric storage device provided by an exemplary embodiment of the present disclosure, wherein a power distribution unit and an insulating partition are shown;

[0059] Figure 7 It is a schematic diagram of the circuit principle between the battery cell module and the power distribution unit provided in an exemplary embodiment of the present disclosure;

[0060] Figure 8 is a schematic structural diagram of a battery cell module in a battery pack provided in another exemplary embodiment of the present disclosure, wherein two battery cell modules are shown, but a first electrical connector, a second electrical connector, a third electrical connector, and a fourth electrical connector are not shown;

[0061] Fig. 9 is a schematic structural diagram of a battery cell module in a battery pack provided by an exemplary embodiment of the present disclosure, wherein a dividing line between two battery cell modules is schematically shown by a dotted line, and a first battery cell column and a second battery cell column are shown by a dotted frame;

[0062] Fig.10 yes Fig. 9 A magnified schematic diagram of part A;

[0063] Fig.11 yes Fig. 9The enlarged schematic diagram of part A in the figure shows the circuit paths of the two first battery cell columns with dotted lines;

[0064] Fig.12 yes Fig. 9 Schematic diagram of the circuit path of a single battery cell module, with the positive and negative poles at the same end.

[0065] Description of Reference Numerals

[0066] 10-switch, 20-battery module, 21-first battery module, 22-second battery module, 23-battery, 24-battery group, 25-first battery column, 251-first battery, 252-battery pair, 26-second battery column, 261-second battery, 30-power distribution unit, 40-current fuse, 51-first conductive member, 511-first extension section, 52-second conductive member, 521-first connecting section, 53-third conductive member, 531-second connecting section, 54- The fourth conductive member, 541-the second extension section, 55-the jumper, 56-the adapter, 561-the adapter straight row, 562-the adapter bent row, 571-the first electrical connection row, 5711-the first section, 5712-the second section, 5713-the third section, 572-the second electrical connection row, 5721-the fourth section, 5722-the fifth section, 5723-the sixth section, 573-the third electrical connection row, 574-the fourth electrical connection row, 575-the fifth electrical connection row, 60-the insulating member, 70-the box. DETAILED DESCRIPTION

[0067] The specific embodiments of the present disclosure are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

[0068] In the present disclosure, it should be understood that, in the present disclosure, unless otherwise stated, the directions or positional relationships indicated by the directional words such as "upper" and "lower" are defined based on the drawing directions shown in the corresponding drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific directional structure and operation, and therefore cannot be understood as a limitation on the present disclosure. The terms "inside" and "outside" may refer to the inside and outside of the corresponding structural contour. "Width direction" and "length direction" can refer to Figure 1 , Figure 6 , Figure 8 and Fig. 9 In addition, it should be noted that the terms used, such as "first", "second", etc., are used to distinguish one element from another element and do not have order and importance. In addition, in the description with reference to the drawings, the same mark in different drawings represents the same element.

[0069] In the description of the present disclosure, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "connected", and "installed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0070] Research has found that in related technologies, the reason why vehicles and other electrical equipment cannot be used for voltage platforms of other values ​​is that each electric shock device (such as a battery pack) only has one charging voltage, that is, it is only suitable for charging with a charging platform (such as a charging pile) that uses a specific charging voltage, such as only suitable for charging with a charging platform that uses 400V (voltage) or a charging platform that uses 800V. The traditional 400V charging platform, limited by hardware capabilities, cannot increase the charging power very high, and the general charging time is more than 30 minutes. Although the 800V charging platform can increase the charging power and reduce the charging time to 15 minutes, most of the charging piles on the market are 400V charging platforms, which are not compatible with 800V and other voltage platforms.

[0071] In view of this, this patent combines the design of the power storage device and proposes a power storage device (such as a battery pack) that can be applied to multiple charging voltages to be compatible with different charging platforms. The power storage device can have conventional charging and fast charging modes.

[0072] Specifically, Figures 1 to 12 As shown, the present disclosure provides a power storage device (such as a battery pack) including a plurality of battery cell modules 20. The power storage device has a first working mode and a second working mode. In the first working mode, any one of the plurality of battery cell modules 20 is charged or discharged individually. In the second working mode, some of the plurality of battery cell modules 20 are connected in series as a whole for charging or discharging, or all of the plurality of battery cell modules 20 are connected in series as a whole for charging or discharging. The plurality of battery cell modules are arranged in a box 70 of a single power storage device.

[0073] In this way, when the power storage device is in the first working mode, any one of the multiple battery modules 20 is charged separately. At this time, the power storage device can be applied to a charging platform with a lower charging voltage, so that it can have a conventional charging mode; when the power storage device is in the second working mode, that is, when some or all of the multiple battery modules 20 are connected in series, the power storage device can be applied to a charging platform with a higher charging voltage, so that it can have a fast charging mode. Therefore, compared with the solution in the related art that the power storage device can only be charged using a charging platform with a fixed voltage, the power storage device provided by the present disclosure can have a charging platform suitable for different voltages, that is, it can be compatible with voltage platforms of multiple voltages, which is conducive to convenient daily use.

[0074] Furthermore, since the multiple battery cell modules in the energy storage device can have different operating modes, the number of battery cell modules 20 for discharge can be different in different operating modes. Therefore, different discharge modes can be provided, and power supply modes with different voltages can be provided to the electric drive components of the electrical equipment (such as the motor of a vehicle).

[0075] In addition, since multiple battery modules 20 are placed in a single box 70, it is not necessary to arrange a box 70 for each battery module 20, and multiple battery modules 20 can share components (such as heat exchange structures), so it can save space and improve the energy density of the energy storage device. Taking a battery pack as an example, a single box 70 in the battery pack can hold multiple battery modules 20, which can save space in the battery pack and help improve the energy density of the battery pack.

[0076] It can be understood that the present disclosure does not limit the number of multiple battery cell modules 20. Two or more battery cell modules 20 can be designed. The number of battery cells 23 included in each battery cell module 20 is also not limited. The design can be based on the voltage of the charging platform that needs to be compatible, and the requirements of being able to convert voltage and be compatible with charging platforms of different voltages can be met.

[0077] The present disclosure does not limit the voltage at which the power storage device is suitable for charging or discharging. Optionally, in one embodiment of the present disclosure, the voltage at which the power storage device is suitable for charging or discharging may be 400V to 800V, including 400V and 800V. For example, the current compatible charging piles need to be 400V and 800V. In order to adapt to the voltage, two battery modules 20 suitable for a 400V charging platform can be designed, or four battery modules 20 suitable for a 200V charging platform can be designed. As long as the requirements are met, there is no limitation on the voltage applicable to the designed single battery module 20.

[0078] For example, two battery modules 20 suitable for a 400V charging platform are set. When the connected charging pile is 400V, only a single battery module 20 needs to be charged. At this time, the switch 10 between the two battery modules 20 can be disconnected, and the positive and negative poles of one battery module 20 are connected to the two ends of the power distribution unit 30 to complete the circuit connection, and the other battery module 20 is not charged; when the connected charging pile is 800V, the two battery modules 20 work in series. At this time, the switch 10 between the two battery modules 20 is closed, and the positive pole of one battery module 20 is connected to the negative pole of the other battery module 20. The two ends of the circuit after series connection are connected to the positive and negative poles of the power distribution unit 30 to complete the circuit connection. At this time, both battery modules 20 can be charged, so that 400V and 800V charging platforms (such as charging piles) can be compatible. When the number of battery modules 20 is three or more, in the second working mode, it can be that the other multiple battery modules in two or more battery modules 20 are connected in series, and the remaining battery modules 20 do not participate in charging or discharging. It should be noted that the power storage device of the present disclosure may be a battery pack or other devices, such as a movable power storage cabinet, which is not limited in the present disclosure. For the sake of simplicity and clarity, the following description mainly takes the power storage device as a battery pack.

[0079] When assembling the energy storage device, the positive pole of each battery cell module 20 can be electrically connected to the positive terminal of the power distribution unit 30, such as the high-voltage distribution box (BDU, Battery Disconnect Unit), and the negative pole of each battery cell module 20 is suitable for being electrically connected to the negative terminal of the power distribution unit 30, and multiple battery cell modules 20 are arranged in sequence in a series circuit of the energy storage device, and the two ends of the series circuit are respectively connected to the positive terminal and the negative terminal of the power distribution unit 30; the switch 10 is set on the series circuit of multiple battery cell modules 20, and is used to connect or disconnect the series circuit between multiple battery cell modules 20.

[0080] The power distribution unit 30 (high-voltage distribution box) is a battery energy distribution unit, which is an important component of the high-voltage circuit of the power-consuming device. The battery energy distribution unit can distribute the high-voltage electricity of the power storage device to the power-consuming device, so that the power storage device can supply power to the power-consuming device. In addition, the power distribution unit 30 can distribute the high-voltage charging current of the AC and DC charging interfaces to the power storage device to charge the power storage device.

[0081] like Figure 1 , Figure 3 and Fig. 9As shown, the power storage device may further include a switch 10, which is disposed on the series circuit where the plurality of battery modules 20 are located. In this way, by controlling the switch 10 to selectively connect and disconnect the series circuit, that is, by opening and closing the switch 10, at least the plurality of battery modules 20 are charged or discharged individually, or the plurality of battery modules 20 are charged or discharged in series, so that the power storage device can switch between the first working mode and the second working mode.

[0082] The present disclosure does not limit the type of switch 10, which may be a relay, an electronic switch, a thyristor, a switching diode, etc., as long as the switch 10 can serve as a circuit-breaking function in the series circuit when a single battery cell module 20 is required to work; and serve as a circuit-closing function in the series circuit when multiple battery cell modules 20 are required to work.

[0083] In embodiments where the switch 10 is a relay, the relay can significantly speed up switching times, eliminate arcing and noise present in electromechanical devices, and essentially have better reliability and predictability, and a longer service life.

[0084] In this disclosure, Figure 1 and Figure 8 As shown, the number of the cell modules 20 can be an even number. Setting the number of the cell modules 20 to an even number facilitates the overall arrangement inside the power storage device. For example, multiple cell modules 20 can be symmetrically arranged along the center line of the power storage device.

[0085] In this disclosure, Figure 2 , Figure 3 and Fig. 9 As shown, the power storage device may further include a current fuse 40, which may be provided on the series circuit where the multiple battery modules are located. Due to the provision of the current fuse 40, when a short circuit occurs in the high-voltage circuit of the power storage device, in addition to disconnecting the series circuit by the switch 10 mentioned above to disconnect the high-voltage circuit of the power storage device, the current fuse 40 may also be used to disconnect the high-voltage circuit in time, thereby avoiding the risk of thermal runaway caused by high-voltage arcing and improving the safety performance of the power storage device.

[0086] In order to avoid mutual influence between the battery modules 20, Figure 6As shown, the power storage device may further include at least one insulating partition 60, and the insulating partition 60 is provided between adjacent battery modules 20. By providing the insulating partition 60, an isolation boundary is provided between the battery modules 20 for physical isolation. When thermal runaway occurs in one of the battery modules 20, the insulating partition 60 can separate the two battery modules 20, and the thermal runaway can be prevented from spreading to other battery modules 20, so that other battery modules 20 can work normally, such as continuously discharging to the outside, thereby facilitating improving the thermal runaway protection of the power storage device.

[0087] For example, in Figure 6 In the embodiment shown in the figure, the cell module 20 includes a first cell module 21 and a second cell module 22. Since an isolation boundary is provided between the first cell module 21 and the second cell module 22 to achieve physical isolation, the first cell module 21 and the second cell module 22 can be isolated at the first time of thermal runaway. Effectively isolating it in one cell module 20 (such as the first cell module 21) will not easily affect another independent cell module 20 (such as the second cell module 22).

[0088] The present disclosure does not limit the number of insulating partitions 60. Figure 6 In the illustrated embodiment, there are two battery cell modules 20 and one insulating partition 60 , which separates the storage device box 70 (such as a battery pack tray) into two symmetrical parts in the width direction of the storage device.

[0089] In order to improve the space utilization rate inside the power storage device and facilitate the connection of the power distribution unit 30, such as Figure 2 and Fig. 9As shown, optionally, the positive and negative electrodes of the battery modules 20 in the multiple battery modules 20 are located on the same side of the power storage device, that is, the electrodes (positive or negative) of all the battery modules 20 in the multiple battery modules 20 are located on the same side of the battery. The battery module 20 includes a plurality of battery cells 23 connected in series, and the battery cells 23 connected in series are connected by the positive and negative electrodes head to tail. Here, the positive and negative electrodes of the battery module 20 are the head and tail positions of the battery cells 23 connected in series. When the battery cell module 20 is in use, its positive and negative electrodes need to be connected to the power distribution unit 30, and the positive and negative electrodes of the battery cell module 20 are set on the same side of the power storage device, so that the positive and negative electrodes of the battery cell module 20 can be connected to the power distribution unit 30 when connected to the power distribution unit 30. There is no need to design a long connection row (used when the positive and negative electrodes of the battery cell module 20 are located on different sides of the power storage device), which is convenient for integration and reasonable arrangement of electrical components between the battery cell module 20 and the power distribution unit 30 (such as the first conductive member 51, the second conductive member 52, the third conductive member 53, the fourth conductive member 54, the switch 10 and the current fuse 40, etc. below), which is conducive to saving space, simplifying the structure and facilitating connection. In addition, during maintenance, because the positive and negative electrodes are set at the same end, when opening the electrical equipment for maintenance, only one side can be opened for inspection, which is convenient for maintenance.

[0090] The present disclosure does not limit the specific arrangement of the positive and negative electrodes of the battery module 20 on the power storage device, which can be designed according to the specific arrangement of the battery cells 23 in the battery module 20. Figure 1 , Figure 2 and Fig. 9 As shown, a plurality of cell modules 20 are arranged along the width direction of the power storage device, each cell module 20 includes at least one cell group 24, the cells 23 in each cell group 24 extend along the length direction of the power storage device, and the positive and negative electrodes of each cell module 20 are located on the same side of the length direction of the power storage device. In other words, Figure 1 and Figure 2 In the illustrated embodiment, the wide side (large side) of each battery cell 23 faces the width direction of the power storage device, the narrow side (small side) of each battery cell 23 faces the length direction of the power storage device, and the positive and negative electrodes of the battery cell module 20 are both located in the direction corresponding to the narrow side of the battery cell 23.

[0091] It is understood that in the present disclosure, the wide surface of the battery cell 23 refers to a surface with a relatively large area among multiple surfaces of the battery cell 23 in the length direction of the battery pack. For example, when the battery pack is installed at the bottom of the vehicle, the wide surface of the battery cell 23 is a surface defined by the edges in the length direction and height direction of the battery cell 23. The narrow surface of the battery cell 23 is a surface defined by the edges in the width direction and height direction of the battery cell 23.

[0092] The present disclosure does not limit the number of cells 23 in each cell group 24. Figure 1 and Figure 2 As shown, each battery cell group 24 includes multiple rows of battery cells 23 arranged along the length direction of the power storage device, and each row of battery cells includes multiple battery cells 23 arranged along the width direction of the power storage device. In the same battery cell group 24, the battery cells 23 in each row are connected in series, and the battery cells 23 in two adjacent rows are connected in series.

[0093] In this disclosure, Figure 1 and Figure 8 As shown, each cell module 20 includes a plurality of cell columns, each cell column includes a plurality of cells 23 arranged along the length direction of the power storage device, and a plurality of cell columns are arranged along the width direction of the power storage device; a plurality of cells 23 in each cell column are connected in series, and two adjacent cell columns are connected in series. The first cell module 21 is arranged adjacent to the second cell module 22, and a switch 10 is provided on the circuit between the negative electrode of the first cell module 21 and the positive electrode of the second cell module 22. Among them, the cell column can be formed by connecting a plurality of cells 23 arranged in series along the length direction of the power storage device, and a plurality of cell columns are connected in series to form a cell module 20.

[0094] As mentioned above, the present disclosure does not limit the number of battery cell modules 20. As an optional embodiment, Figure 1 , Figure 2 and Figure 8 As shown, the number of the plurality of cell modules 20 is two, namely the first cell module 21 and the second cell module 22. The positive electrode of the first cell module 21 is suitable for being electrically connected to the positive terminal of the power distribution unit 30, and the negative electrode of the first cell module 21 is suitable for being electrically connected to the negative terminal of the power distribution unit 30; the positive electrode of the second cell module 22 is suitable for being electrically connected to the positive terminal of the power distribution unit 30, and the negative electrode of the second cell module 22 is suitable for being electrically connected to the negative terminal of the power distribution unit 30. The switch 10 is arranged on the circuit between the negative electrode of the first cell module 21 and the positive electrode of the second cell module 22.

[0095] That is, the number of the plurality of battery cell modules 20 can be two, and the two battery cell modules 20 are respectively the first battery cell module 21 and the second battery cell module 22, the first battery cell module 21 and the second battery cell module 22 are connected in series, and a switch 10 is provided on the series circuit, and when the switch 10 is disconnected, the positive and negative electrodes of the first battery cell module 21 are respectively connected to the two ends of the power distribution unit 30, or the positive and negative electrodes of the second battery cell module 22 are respectively connected to the two ends of the power distribution unit 30, and the first battery cell module 21 or the second battery cell module 22 can be selected for separate charging or discharging. When the switch 10 is closed, the first battery cell module 21 and the second battery cell module 22 are used in series.

[0096] In order to simplify the structure and improve the space utilization of the battery cell accommodating cavity in the box body 70, the first battery cell module 21 and the second battery cell module 22 can be arranged symmetrically. Figure 6 As shown, the insulating partition 60 divides the cell accommodating chamber of the box 70 into two chambers, and the first cell module 21 and the second cell module 22 are located in the corresponding chambers and arranged symmetrically, so as to facilitate the design of the chamber to accommodate the first cell module 21 and the second cell module 22.

[0097] It can be understood that the first battery cell module 21 and the second battery cell module 22 are symmetrically arranged, which means that the battery cells 23 of the first battery cell module 21 and the battery cells 23 of the second battery cell module 22 are at least symmetrically arranged. As for the relevant electrical connectors or electrical connection rows of the first battery cell module 21 (such as the first electrical connector 51, the second electrical connector 52, the jumper 55, the adapter 56, the first electrical connection row 571, the second electrical connection row 572, the third electrical connection row 573, the fourth electrical connection row 574 and the fifth electrical connection row 575 as described below) and the relevant electrical connectors of the second battery cell module 22 (such as the third electrical connector 53, the fourth electrical connector 54, the jumper 55, the adapter 56, the first electrical connection row 571, the second electrical connection row 572, the third electrical connection row 573, the fourth electrical connection row 574 and the fifth electrical connection row 575 as described below), they can be arranged symmetrically or asymmetrically, and the present disclosure does not limit this.

[0098] Optionally, the electrical connectors or electrical connection bars in the first battery cell module 21 and the second battery cell module 22 may be arranged symmetrically. Such a design facilitates the arrangement and assembly of the electrical connectors or electrical connection bars in the battery pack.

[0099] In the present disclosure, according to the arrangement of the battery cells 23 in the battery cell module 20, the first battery cell module 21 and the second battery cell module 22 can be arranged symmetrically about any direction, for example, they can be symmetrical about the length direction of the power storage device, or symmetrical about the width direction of the power storage device, or symmetrical about other suitable directions, and the present disclosure is not limited to this.

[0100] Alternatively, if Figure 1 and Figure 6 As shown, the first cell module 21 and the second cell module 22 are symmetrically arranged about the midline of the width direction of the power storage device. The symmetrical arrangement along the midline of the width direction not only ensures the reasonable arrangement of the power storage device, but also facilitates the arrangement direction of the cell 23 to arrange the positive and negative electrodes of the first cell module 21 and the second cell module 22 on one side of the length direction of the power storage device. At this time, see Figure 6 The insulating partition 60 is equivalent to extending along the length direction of the power storage device and is located on the center line of the power storage device in the width direction.

[0101] For example, when the first battery cell module 21 is used alone, the first electrical connector 51 and the second conductive member 52 on the battery cell group 24 are connected to the power distribution unit 30. Since the first conductive member 51 and the fourth conductive member 54, the second conductive member 52 and the third conductive member 53 are symmetrically arranged about the center line of the width direction of the power storage device, the first conductive member 51 and the second conductive member 52 on the first battery cell module 21 have no influence on the third conductive member 53 and the fourth conductive member 54 when connected to the power distribution unit 30. Moreover, the first battery cell module 21 and the second battery cell module 22 are also symmetrically arranged about the center line of the width direction of the power storage device. This can ensure that they are independent of each other when used alone, and can also ensure that the arrangement inside the power storage device (such as a battery pack) is neat and reasonable.

[0102] In the present disclosure, in order to facilitate the electrical connection between the first battery cell module 21 and the second battery cell module 22 and the power distribution unit 30, as shown in FIG. Figures 1 to 3 As shown, the energy storage device also includes a first conductive member 51 and a second conductive member 52. The first conductive member 51 is connected to the positive electrode of the first battery cell module 21 to serve as a positive electrode lead-out member of the first battery cell module 21. The second conductive member 52 is connected to the negative electrode of the first battery cell module 21 to serve as a negative electrode lead-out member of the first battery cell module 21.

[0103] The first conductive member 51 and the second conductive member 52 include but are not limited to a connecting row, a connecting line, etc. The first conductive member 51 can be used as a positive lead-out member of the first cell module 21 when used alone, and can also be used to electrically connect the positive lead-out member of the first cell module 21 when the first cell module 21 and the second cell module 22 are connected in series. The second conductive member 52 is used to connect the negative lead-out member of the first cell module 21 when the first cell module 21 is used alone.

[0104] like Figures 1 to 3 as well as Fig. 9 As shown, the power storage device may further include a third conductive member 53 and a fourth conductive member 54, wherein the third conductive member 53 is connected to the positive electrode of the second battery cell module 22 to serve as a positive electrode lead-out member of the second battery cell module 22, and the fourth conductive member 54 is connected to the negative electrode of the second battery cell module 22 to serve as a negative electrode lead-out member of the second battery cell module 22. A switch 10 and / or a current fuse 40 are also provided on the circuit between the second conductive member 52 and the third conductive member 53.

[0105] When the first battery cell module 21 needs to be used alone or when the second battery cell module 22 needs to be used alone, that is, in the first working mode, the switch 10 can be opened. When the first battery cell module 21 and the second battery cell module 22 need to be used in series, that is, in the second working mode, the switch 10 can be closed.

[0106] The third conductive member 53 and the fourth conductive member 54 include but are not limited to connecting bars, connecting wires, etc. The third conductive member 53 is used as a positive lead-out member of the second cell module 22 when used alone, and the fourth conductive member 54 can be used as a negative lead-out member of the second cell module 22 when used alone, or can be used as a negative lead-out member electrically connected to the second cell module 22 when the first cell module 21 and the second cell module 22 are connected in series.

[0107] In the present disclosure, optionally, the first conductive member 51 , the second conductive member 52 , the third conductive member 53 and the fourth conductive member 54 may be copper-aluminum composite bars, which may be connected to corresponding electrodes of the battery cell by welding.

[0108] like Figures 1 to 3 As shown, the first cell module 21 and the second cell module 22 can be arranged along the width direction of the power storage device; the first conductive member 51, the second conductive member 52, the third conductive member 53 and the fourth conductive member 54 are located on the same side of the length direction of the power storage device. In the width direction of the power storage device, the first conductive member 51 and the fourth conductive member 54 are the two conductive members located on the outermost side, that is, in the width direction of the power storage device, the second conductive member 52 is located between the first conductive member 51 and the fourth conductive member 54, and the third conductive member 53 is also located between the first conductive member 51 and the fourth conductive member 54. With this design, all the connectors are arranged on the same side, which is convenient for initial arrangement and installation, and convenient for maintenance and replacement in the later stage.

[0109] Furthermore, since the first conductive member 51 and the fourth conductive member 54 are the two conductive members located at the outermost sides, and the second conductive member 52 and the third conductive member 53 are the two conductive members located in the middle, it is convenient to set the circuit between the second conductive member 52 and the third conductive member 53 as follows: Figure 1 A switch 10 and a current fuse 40 are shown.

[0110] like Figure 1 and Figure 2 As shown, optionally, in the width direction of the power storage device, the first conductive member 51 and the fourth conductive member 54 can be arranged symmetrically about the midline of the width direction of the power storage device; the second conductive member 52 and the third conductive member 53 can be arranged symmetrically about the midline of the width direction of the power storage device. The symmetrical arrangement can simplify the structure, save space, and also facilitate the connection of each conductive member with the corresponding electrical device.

[0111] like Figure 2 and Figure 3As shown, in one embodiment of the present disclosure, the first conductive member 51 has a first extension section 511, and the fourth conductive member 54 has a second extension section 541. The first extension section 511 and the second extension section 541 extend toward each other along the width direction of the power storage device. The first extension section 511 is suitable for being electrically connected to the positive terminal of the power distribution unit 30, and the second extension section 541 is suitable for being electrically connected to the secondary terminal of the power distribution unit 30. With such an arrangement, the first conductive member 51 and the fourth conductive member 54 can have a connection point close to the middle of the power storage device, thereby facilitating the connection of the power distribution unit 30. Figure 2 and Figure 3 As shown, the second conductive member 52 has a first connecting section 521, and the third conductive member 53 has a second connecting section 531. The first connecting section 521 and the second connecting section 531 extend toward each other along the width direction of the power storage device. The first connecting section 521 is connected to one of the switch 10 and the current fuse 40, and the second connecting section 531 is connected to the other of the switch 10 and the current fuse 40. Optionally, the first connecting section 521 is connected to the current fuse 40, and the second connecting section 531 is connected to the switch 10. Such an arrangement facilitates the concentration of the switch 10 and the current fuse 40 in the middle of the width direction of the power storage device, thereby facilitating the connection of the power distribution unit 30 and improving the positional integration of the electrical components between the battery cell module 20 and the power distribution unit 30.

[0112] In the present disclosure, the first conductive member 51 may further include a first connecting portion connected to the positive electrode of the first battery module 21, and the first connecting portion is connected to the first extension section 511. The fourth conductive member 54 may further include a second connecting portion connected to the negative electrode of the first battery module 21, and the second connecting portion is connected to the second extension section 541.

[0113] The present disclosure does not limit the number of the cell groups 24 in the first cell module 21 and the second cell module 22. Figure 1 and Figure 2 As shown, in one embodiment of the present disclosure, the first cell module 21 includes two cell groups 24 arranged in the width direction of the power storage device and connected in series, and the second cell module 22 includes two cell groups 24 arranged in the width direction of the power storage device and connected in series. The first conductive member 51 is connected to the positive electrode of the cell group 24 located outside the width direction of the power storage device in the first cell module 21, the second conductive member 52 is connected to the negative electrode of the cell group 24 located inside the width direction of the power storage device in the first cell module 21, the third conductive member 53 is connected to the positive electrode of the cell group 24 located inside the width direction of the power storage device in the second cell module 22, and the fourth conductive member 54 is connected to the negative electrode of the cell group 24 located outside the width direction of the second cell module 22.

[0114] In this way, when the first cell module 21 works alone, the two cell groups 24 in the first cell module 21 are connected in series, and can be electrically connected to the positive terminal and the negative terminal of the power distribution unit 30 through the first conductive member 51 and the second conductive member 52, respectively. When the second cell module 22 works alone, the two cell groups 24 in the second cell module 22 are connected in series, and can be electrically connected to the positive terminal and the negative terminal of the power distribution unit 30 through the third conductive member 53 and the fourth conductive member 54, respectively.

[0115] When the first battery cell module 21 and the second battery cell module 22 are connected in series, the two battery cell groups 24 in the first battery cell module 21 are connected in series, and the two battery cell groups 24 in the second battery cell module 22 are connected in series, and the battery cell group 24 in the first battery cell module 21 adjacent to the second battery cell module 22 and the battery cell group 24 in the second battery cell module 22 adjacent to the first battery cell module 21 can be connected in series through the second conductive member 52 and the third conductive member 53, the battery cell group 24 in the first battery cell module 21 away from the second battery cell module 22 can be connected to the positive terminal of the power distribution unit 30 through the first conductive member 51, and the battery cell group 24 in the second battery cell module 22 away from the first battery cell module 21 is connected to the negative terminal of the power distribution unit 30 through the fourth conductive member 54.

[0116] The present disclosure does not limit the number of cells in each cell group 24. Figure 1 and Figure 2 As shown, the four battery cell groups 24 include multiple rows of battery cells 23 arranged along the length direction of the power storage device, each row of battery cells includes multiple battery cells 23 arranged along the width direction of the power storage device, and each battery cell 23 extends along the length direction of the power storage device. In the same battery cell group 24, the battery cells 23 in each row of battery cells are connected in series, and the battery cells in two adjacent rows are connected in series.

[0117] The present disclosure does not limit the manner in which the cells 23 in each row are connected in series, nor does it limit the manner in which the cells in two adjacent rows are connected in series. Figures 3 to 5 As shown, the power storage device may further include a plurality of jumpers 55 and adapters 56. Adjacent cells 23 in the same row of cells are connected in series via jumpers 55, and cells 23 in two adjacent rows are connected in series via adapters 56. Figures 1 to 5 In the illustrated embodiment, in the same row of battery cells, the wide surfaces of adjacent battery cells 23 face each other, and in two adjacent rows of battery cells in the same battery cell group 24, the narrow surfaces of adjacent battery cells 23 face each other.

[0118] The jumper 55 and the adapter 56 include but are not limited to electrical connection bars, electrical connection sheets, etc. For example, the jumper 55 and the adapter 56 can both be made of aluminum bars and can be connected to the positive or negative electrode of the battery cell 23 by welding.

[0119] In order to ensure that the positive and negative electrodes of the first cell module 21 and the second cell module 22 can be located on the same side of the battery pack, Figures 3 to 5 As shown, the adapter 56 may include a straight adapter row 561 and a bent adapter row 562. The straight adapter row 561 connects two battery cells 23 in two adjacent rows whose narrow sides are opposite to each other in the width direction of the battery pack of the battery. The bent adapter row 562 connects the positive and negative electrodes of two battery cells 23 in two adjacent rows whose narrow sides are in the width direction of the battery pack. The positive electrodes of the two battery cells 23 here face the same side.

[0120] In this way, the switching straight row 561 can directly connect the battery cells 23 with narrow sides facing each other in adjacent rows to achieve a series connection effect; the switching curved row 562 can bridge two battery cells 23 with wide sides facing each other and with positive poles facing the same side. Figure 4 As shown, the positive and negative electrodes of the two battery cells 23 after being connected can be located at opposite sides in the length direction of the battery pack, so as to facilitate connection with other battery cells 23 (the number is an odd number), so that the electrodes (such as the positive and negative electrodes) of all battery cells 23 after being connected are located at the same end in the length direction of the battery pack. Width direction of the battery pack.

[0121] The present disclosure does not limit the specific shapes of the jumper 55, the transition straight row 561 and the transition curved row 562. Figures 3 to 5 As shown, the jumper 55 and the transition straight row 561 can be in a "I" shape, and the transition curved row 562 can be or approximate to a "Z" shape, so as to facilitate the bridging of the battery cells 23 with narrow faces of adjacent columns that are offset and opposite to each other.

[0122] It can be understood that when it is necessary to design so that the electrodes (positive and negative) of multiple battery cell modules 20 are all arranged on the same side of the energy storage device, and the first battery cell module 21 is provided with two battery cell groups 24, and the second battery cell module 22 is provided with two battery cell groups 24, in the same battery cell module, the wiring can be routed from the positive electrode of one battery cell group 24 and then looped back from another battery cell group 24.

[0123] like Figures 3 to 5 As shown, a schematic diagram of the connection of a local circuit in a battery cell module (the first battery cell module 21) is shown by dashed arrows.

[0124] In another embodiment of the present disclosure, Figures 8 to 12As shown, the first cell module 21 and the second cell module 22 each include a plurality of cell columns, each cell column includes a plurality of cells 23 arranged along the length direction of the power storage device, and the plurality of cell columns are arranged along the width direction of the power storage device; the plurality of cells 23 in each cell column are connected in series, and two adjacent cell columns are connected in series. The cell column can be formed by connecting a plurality of cells 23 arranged along the length direction of the power storage device in series, and the plurality of cell columns are connected in series to form a cell module 20.

[0125] like Fig. 9 As shown, the first conductive member 51 is connected to the outermost column of cells in the width direction of the power storage device in the first cell module 21, the second conductive member 52 is connected to the innermost column of cells in the width direction of the power storage device in the first cell module 21, the third conductive member 53 is connected to the innermost column of cells in the width direction of the power storage device in the second cell module 22, and the fourth conductive member 54 is connected to the outermost column of cells in the width direction of the power storage device in the second cell module 22. When the first cell module 21 and the second cell module 22 are used in series, the third conductive member 53 is connected in series with the second conductive member 52, so that the connection switch 10 and the current fuse 40 between the two are convenient, as shown in FIG. Fig. 9 As shown, the second conductive member 52 is connected to the innermost column of cells in the width direction of the energy storage device in the first cell module 21, and the third conductive member 53 is connected to the innermost column of cells in the width direction of the energy storage device in the second cell module 22. The positions of the third conductive member 53 and the second conductive member 52 are concentrated, which facilitates the arrangement of the switch 10 and the current fuse 40.

[0126] The outermost cell rows here refer to the two cell rows of all cell rows of the two cell modules 20 (the first cell module 21 and the second cell module 22) that are farthest apart in the width direction of the power storage device. The innermost cell rows refer to the two cell rows of all cell rows of the two cell modules 20 that are closest to each other in the width direction of the power storage device.

[0127] In the present disclosure, optional, such as Figures 9 to 11As shown, the multiple cell columns in each cell module 20 include at least two first cell columns 25, each first cell column 25 includes a plurality of first cell 251 arranged along the length direction of the power storage device, in the length direction of the power storage device, the plurality of first cell 251 in one first cell column 25 is arranged corresponding to the plurality of first cell 251 in another adjacent first cell column 25, and a plurality of cell pairs 252 are constructed, each cell pair 252 includes two first cell 251 located in different first cell columns 25, the power storage device also includes a first electrical connection row 571 and a second electrical connection row 572, the two first cell 251 in each cell 252 are connected in series via the first electrical connection row 571, and two adjacent cell pairs 252 are suitable for being connected in series via the second electrical connection row 572.

[0128] The cell module 20 may be formed by connecting a plurality of cells in series. All cells in a cell module 20 may be connected in series. The cell module 20 has a positive electrode and a negative electrode connected to the power distribution unit 30. A cell pair 252 includes two first cells 251 arranged along the width direction of the power storage device. The first electrical connection row 571 is used to connect the two first cells 251 in the cell pair 252 in series, so that the positive and negative electrodes of the two first cells 251 arranged along the width direction of the power storage device after being connected in series are at opposite ends in the length direction of the power storage device, so that the positive and negative electrodes of adjacent cell rows after being connected in series are at opposite ends in the length direction of the power storage device.

[0129] Since the battery cells 23 in a single battery cell column have a circuit channel along the length direction of the energy storage device after being connected in series, the circuit channel has a rotation channel (the circuit channel at the ends of the two battery cell columns) after two adjacent battery cell columns are connected in series. Therefore, after the two battery cell columns are connected in series, the positive and negative poles of the circuit channel here can be at the same end. Similarly, the circuit channels of the battery cells in even-numbered columns can all have the positive and negative poles of the total circuit channel at the same end. Therefore, the positive and negative poles of the total circuit channel of the circuit channels in odd-numbered columns are located at opposite ends of the length direction of the energy storage device.

[0130] like Fig.11 and Fig.12 As shown, this design is equivalent to connecting the circuit channels in the two columns of first battery cells 251 in series into a circuit channel without a return channel. Therefore, after the circuit channel is connected in series with the circuit channels in other odd-numbered columns, the positive and negative poles of the total circuit channel can be located at the same end of the energy storage device, which facilitates the arrangement of the electrodes of the energy storage device.

[0131] In summary, in the power storage device (such as a battery pack) provided by the present disclosure, adjacent first battery cells 251 in adjacent first battery cell columns 25 form a battery cell pair 252, and the two first battery cells 251 in the battery cell pair 252 are connected in series, and the adjacent battery cell pairs 252 are connected in series, so that the starting point and the end point of the current direction of the two columns of first battery cells 251 are located at opposite ends of the length direction of the power storage device (such as Fig.11 When the number of cell columns of the cell module 20 is an odd number, the above solution can make the two first cell columns 25 equivalent to a composite cell column, and the composite cell column is combined with the remaining cell columns (such as Fig. 9 In other words, through the above scheme, the cell columns with odd numbers in the cell module can be constructed similarly to the cell columns with even numbers. For the cell columns with even numbers, by connecting a plurality of cell columns with even numbers in series, the positive terminal and the negative terminal of the cell module 20 can be located at the same end of the power storage device, thereby facilitating the arrangement of the electrodes of the power storage device and facilitating the electrical connection between the cell module 20 and the power distribution unit 30.

[0132] In the present disclosure, in the length direction of the power storage device, the positive electrodes of the two first cells 251 in each cell pair 252 are located on the same side, the positive electrode of one first cell 251 in each cell pair 252 is electrically connected to the negative electrode of the other first cell 251 through the first electrical connector 51, and the positive electrode of one of the two adjacent cell pairs 252 is electrically connected to the negative electrode of the other through the second electrical connection row 572. Fig.10 As shown, the positive electrodes of the two first battery cells 251 in the battery cell pair 252 are located on the same side, so that after the positive and negative electrodes of the two first battery cells 251 in the battery cell pair 252 are connected in series, the positive and negative electrodes of the battery cell pair 252 are located at opposite ends in the length direction of the power storage device.

[0133] In this disclosure, Fig. 9 As shown, the multiple cell columns in each cell module 20 also include at least one second cell column 26, the second cell column 26 and the first cell column 25 are arranged along the width direction of the power storage device, and at least one second cell column 26 is connected in series with the first cell column 25, the second cell column 26 includes a plurality of second cells 261 arranged along the length direction of the power storage device, and the plurality of second cells 261 in the same second cell column 26 are connected in series. The second cell column 26 includes a plurality of second cells 261 arranged along the length direction of the power storage device, and since the positive and negative electrodes of the second cells 261 are arranged along the length direction of the power storage device, respectively, the plurality of second cells 261 in the same second cell column 26 are connected in series. The second cell column 26 is connected in series with the first cell column 25 to form a cell module 20.

[0134] In this disclosure, Figure 8As shown, the power storage device also includes multiple third electrical connection rows 573, multiple fourth electrical connection rows 574 and multiple fifth electrical connection rows 575. Two adjacent second battery cells 261 in the same second battery cell column 26 are connected in series through the third electrical connection row 573, two adjacent second battery cell columns 26 are connected in series through the fourth electrical connection row 574, and the first battery cell column 25 and the adjacent second battery cell column 26 are connected in series through the fifth electrical connection row 575.

[0135] Among them, Fig.10 As shown, the specific structure of the first electrical connection row 571 is not limited. Optionally, the first electrical connection row 571 includes a first section 5711, a second section 5712 and a third section 5713. The first section 5711 and the third section 5713 are respectively connected to the opposite ends of the second section 5712, and the first section 5711 and the third section 5713 extend in opposite directions from the opposite ends of the second section 5712 in the length direction of the power storage device. The first section 5711 is connected to the positive electrode of a first battery cell 251 in the battery cell pair 252, and the third section 5713 is electrically connected to the negative electrode of the other first battery cell 251 in the battery cell pair 252. The two first cells 251 of the cell pair 252 are arranged along the width direction of the power storage device, and the first electrical connection row 571 is used to connect the two first cells 251, wherein the second section 5712 is used to connect the two first cells 251 in the width direction of the power storage device, and the first section 5711 and the third section 5713 are connected to the opposite ends of the second section 5712, and extend in opposite directions in the length direction of the power storage device, so as to facilitate the connection of the positive and negative electrodes of the two first cells 251. Since the positive electrodes of the two first cells 251 are located on the same side in the length direction of the power storage device, such a design facilitates the connection of the positive and negative electrodes of the two first cells 251 by the first electrical connection row 571. The extension direction of the second section 5712 can intersect with the length direction of the power storage device. In other words, the second section 5712 can be connected to the first section 5711 at an angle, and the second section 5712 can be connected to the third section 5713 at an angle. The present disclosure does not limit the connection angle between the second section 5712 and the first section 5711 , and the connection angle between the second section 5712 and the third section 5713 , which may be any appropriate angle.

[0136] For example, Fig.10As shown, the connection angle between the second section 5712 and the first section 5711 can be 90°, that is, the first section 5711 can be perpendicular to the second section 5712, and the connection angle between the second section 5712 and the third section 5713 is 90°, that is, the third section 5713 can be perpendicular to the second section 5712, and the first electrical connection row 571 is constructed in a form similar to a "Z" row. Since the two first battery cells 251 between the battery cell pairs 252 are arranged relative to each other, the two first battery cells 251 are arranged in parallel, and the first electrical connection row 571 is set in a form similar to a "Z" row, which facilitates the first electrical connection row 571 to connect the two first battery cells 251, and the battery cell pairs 252 can be arranged neatly.

[0137] The specific structure of the second electrical connection row 572 is not limited. Optionally, in an embodiment of the present disclosure, Fig.10 As shown, the second electrical connection row 572 includes a fourth section 5721, a fifth section 5722 and a sixth section 5723, the fourth section 5721 and the sixth section 5723 are respectively connected to the opposite ends of the fifth section 5722, the fourth section 5721 and the sixth section 5723 respectively extend from the opposite ends of the fifth section 5722 in opposite directions in the length direction of the power storage device, the fourth section 5721 is connected to the positive electrode of one of the two adjacent battery cell pairs 252, and the sixth section 5723 is connected to the negative electrode of the other of the two adjacent battery cell pairs 252. Multiple battery cell pairs 252 are arranged along the length direction of the power storage device, and the second electrical connection row 572 is used to connect two battery cell pairs 252, wherein the fifth section 5722 is used to connect the two battery cell pairs 252 in the length direction of the power storage device, and the fourth section 5721 and the sixth section 5723 are connected to the opposite ends of the fifth section 5722 and extend in opposite directions in the length direction of the power storage device. This arrangement facilitates the second electrical connection row 572 to connect the positive and negative poles of the two battery cell pairs 252.

[0138] In this disclosure, Fig.10 As shown, the extension direction of the fifth segment 5722 may intersect with the length direction of the power storage device. In other words, the fifth segment 5722 is connected to the fourth segment 5721 at an angle, and the fifth segment 5722 is connected to the sixth segment 5723 at an angle. The present disclosure does not limit the connection angle between the fifth segment 5722 and the fourth segment 5721, and the connection angle between the fifth segment 5722 and the sixth segment 5723, which may be any appropriate angle.

[0139] For example, Fig.10As shown, the connection angle between the fifth section 5722 and the fourth section 5721 can be 90°, that is, the fourth section 5721 can be perpendicular to the fifth section 5722, and the connection angle between the fifth section 5722 and the sixth section 5723 can be 90°, that is, the sixth section 5723 can be perpendicular to the fifth section 5722, and the second electrical connection row 572 is constructed in a form similar to a "Z" row. Since the battery cell pairs 252 are arranged along the length direction of the power storage device, the second electrical connection row 572 is set in a form similar to a "Z" row, which makes it convenient for the second electrical connection row 572 to connect the positive and negative poles of the two battery cell pairs 252, and the first battery cell column 25 can be arranged neatly.

[0140] In the length direction of the power storage device, the lengths of the first section 5711 and the third section 5713 of the first electrical connection row 571 can be equal, the lengths of the fourth section 5721 and the sixth section 5723 of the second electrical connection row 572 can be the same, and the length of the fourth section 5721 can be smaller than the length of the first section 5711.

[0141] In this disclosure, Figure 8 As shown, in order to facilitate the connection of two adjacent second battery cells 261 , the third electrical connection row 573 can be constructed as a strip extending along the first direction, and both ends of the third electrical connection row 573 are electrically connected to two adjacent second battery cells 261 in the same second battery cell column 26 .

[0142] In order to facilitate the connection of the battery cell rows, the fourth electrical connection bar 574 and the fifth electrical connection bar 575 may be configured as strips extending along the width direction of the power storage device.

[0143] The fourth electrical connection bar 574 and the fifth electrical connection bar 575 may have the same structure or different structures. When the fourth electrical connection bar 574 and the fifth electrical connection bar 575 are constructed as the same structure, unified processing is convenient.

[0144] In the present disclosure, the number of the battery cell module 20 is not limited, and there is at least one battery cell module 20. Figure 8 As shown, the number of battery cell modules can be two. In each battery cell module 20, the number of first battery cell columns 25 is two, and the number of second battery cell columns 26 is an odd number. In this way, as analyzed above, the positive terminal and the negative terminal of the battery cell module 20 can be located on the same side of the length direction of the power storage device.

[0145] Among them, Figure 8 and Fig. 9As shown, the first battery cell columns 25 appear in pairs, and the first battery cells 251 of the two first battery cell columns 25 are connected in series, and have positive and negative electrodes located at opposite ends in the length direction of the power storage device. A single second battery cell column 26 also has positive and negative electrodes located at opposite ends in the length direction of the power storage device. Therefore, when the second battery cell column 26 is connected to the two first battery cell columns 25, the positive and negative electrodes located at the same end can be obtained. Then, when the second battery cell columns 26 in the battery cell module 20 are odd-numbered columns, multiple second battery cell columns 26 are connected in series and then connected in series with two first battery cell columns 25 having positive and negative electrodes located at opposite ends in the length direction of the power storage device, so that the positive and negative electrodes of the battery cell module 20 can be located at the same end of the power storage device.

[0146] For example, the number of battery cell modules 20 is set to two. When the number of columns of battery cells in the energy storage device is a multiple of 4, such as 20 columns or 24 columns, the ends of the battery cells in each column are connected in series, so that the electrodes of multiple single battery cell modules 20 are at the same end.

[0147] For example, the number of the battery cell modules 20 is set to two. When the number of columns of the single-row battery cells of a single battery cell module 20 is not a multiple of 2, and the number of columns of the single-row battery cells of the power storage device is not a multiple of 4, such as 26 columns (the number of columns of the single-row battery cells of a single battery cell module 20 is 13 columns), the ends of the battery cells in each column are connected in series, and the electrodes of the battery cell module 20 cannot be located at the same end of the power storage device. Fig.11 and Fig.12 As shown, the single-row battery cells of the two first battery cell rows 25 are cross-connected in series through the first electrical connection row 571 and the second electrical connection row 572, as shown in FIG. Fig.11 and Fig.12 The current arrows shown are equivalent to forming a composite single-row battery cell. This series connection scheme is equivalent to changing the 13-row battery cell of a single battery cell module 20 to 11-row battery cells plus 1-row composite single-row battery cell, which is 12-row battery cells, so that the total number of battery cell rows is a multiple of 2, that is, changing the 26-row battery cell of the two battery cell modules 20 to 22-row battery cells plus 2-row composite single-row battery cells, which is 24-row battery cells, so that the total number of battery cell rows is a multiple of 4, and finally ensuring that the electrodes belong to the same end of the power storage device;

[0148] In this disclosure, Figure 8 As shown, the number of the battery cell modules 20 can be two. The two battery cell modules 20 are arranged correspondingly, and can be used alone or in series, and can be adapted to the use of different voltage platforms. One of the two battery cell modules is selected to be used alone or the two battery cell modules are connected in series and used simultaneously, so that the power storage device can be applied to charging platforms with different charging voltages, and can discharge at different voltages at the same time.

[0149] It can be understood that, in the present disclosure, the first battery cell 251 and the second battery cell 261 may have the same structure or different structures.

[0150] According to a second aspect of the present disclosure, there is provided an electrical device, which includes an equipment body and a power storage device, wherein the power storage device is installed on the equipment body and is used to supply power to the equipment body.

[0151] Here, the electrical equipment may be vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, which are not limited in the present disclosure.

[0152] Optionally, when the electrical equipment is a vehicle and the power storage device is a battery pack, the power storage device of the present disclosure can be installed on the body of the vehicle to provide power for driving the vehicle.

[0153] Figure 7 A circuit schematic diagram of a battery pack connected to a power distribution unit 30 is shown, wherein two battery cell modules 20 are connected in series, and a switch 10 and a current fuse 40 for controlling the disconnection of the series circuit are connected to the series circuit. The other end of the two battery cell modules 20 connected in series is connected to the circuit of the power distribution unit 30, and a pre-charging circuit is provided in the power distribution unit 30 for protecting the switch 10.

[0154] When a single battery module 20 is working, F1 (current fuse 40) and F2 (switch 10) are disconnected (or one of them is disconnected) to ensure that the series circuit between the battery modules 20 is disconnected, and the first battery module 21 or the second battery module 22 is connected to the power distribution unit 30 separately, which is suitable for the low-voltage charging system. When two battery modules 20 are working in series, F1 works normally, F2 (closed, the two ends of the series circuit of the first battery module 21 and the second battery module 22 are connected to the power distribution unit 30, which is suitable for the high-voltage charging system.

[0155] Understandably, Figure 7 The present disclosure provides a circuit schematic diagram for realizing the above functions. The present disclosure does not limit other circuit diagrams or other circuit arrangements that can realize the above functions.

[0156] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0157] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further explain various possible combinations.

[0158] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An electric storage device, characterized in that: Comprising a plurality of battery cell modules, the power storage device has a first working mode and a second working mode; In the first working mode, any one of the plurality of battery modules is charged or discharged individually; In the second working mode, some of the plurality of battery modules are connected in series as a whole for charging or discharging, or all of the plurality of battery modules are connected in series as a whole for charging or discharging; The multiple battery cell modules are arranged in a box of a single power storage device.

2. The power storage device according to claim 1, characterized in that: The power storage device is suitable for charging or discharging at a voltage of 400V to 800V.

3. The power storage device according to claim 1, characterized in that: The power storage device further includes a switch, which is arranged on the series circuit where the multiple battery modules are located.

4. The power storage device according to claim 1, characterized in that: The number of the battery cell modules is an even number.

5. The power storage device according to claim 1, characterized in that: The power storage device further includes a current fuse, which is arranged on the series circuit where the multiple battery modules are located.

6. The power storage device according to claim 1, characterized in that: The power storage device further includes at least one insulating member, and the insulating member is disposed between two adjacent battery cell modules.

7. The power storage device according to claim 1, characterized in that: The positive poles and negative poles of the battery cell modules in the plurality of battery cell modules are both located on the same side of the power storage device.

8. The power storage device according to claim 7, characterized in that: The plurality of battery cell modules are arranged along the width direction of the power storage device, and each of the battery cell modules includes at least one battery cell group; The cells in each cell group extend along the length direction of the power storage device; The positive electrodes and negative electrodes of the battery cell modules in the plurality of battery cell modules are located on the same side in the length direction of the power storage device.

9. The power storage device according to claim 8, characterized in that: Each of the battery cell groups includes a plurality of rows of battery cells arranged along the length direction of the power storage device, and each row of the battery cells includes a plurality of battery cells arranged along the width direction of the power storage device; In the same battery cell group, the battery cells in each row are connected in series, and the battery cells in two adjacent rows are connected in series.

10. The power storage device according to claim 7, characterized in that: Each of the battery cell modules includes a plurality of battery cell rows, each battery cell row includes a plurality of battery cells arranged along the length direction of the power storage device, and the plurality of battery cell rows are arranged along the width direction of the power storage device; A plurality of battery cells in each battery cell column are connected in series, and two adjacent battery cell columns are connected in series.

11. The power storage device according to any one of claims 1 to 7, characterized in that: The number of the plurality of battery cell modules is two, namely a first battery cell module and a second battery cell module; The first battery cell module is arranged adjacent to the second battery cell module, and a switch is provided on the circuit between the negative electrode of the first battery cell module and the positive electrode of the second battery cell module.

12. The power storage device according to claim 11, characterized in that: The two battery cell modules are arranged symmetrically.

13. The power storage device according to claim 12, characterized in that: The two battery cell modules are arranged symmetrically about a midline in a width direction of the power storage device.

14. The power storage device according to claim 11, characterized in that: The power storage device further includes a first conductive member and a second conductive member; The first conductive member is connected to the positive electrode of the first battery cell module to serve as a positive electrode lead-out member of the first battery cell module; The second conductive member is connected to the negative electrode of the first battery cell module to serve as a negative electrode lead-out member of the first battery cell module.

15. The power storage device according to claim 14, characterized in that: The power storage device further includes a third conductive member and a fourth conductive member; The third conductive member is connected to the positive electrode of the second battery cell module to serve as a positive electrode lead-out member of the second battery cell module; The fourth conductive member is connected to the negative electrode of the second battery cell module to serve as a negative electrode lead-out member of the second battery cell module; The switch and / or current fuse is also arranged on the circuit between the second conductive member and the third conductive member.

16. The power storage device according to claim 15, characterized in that: The first battery cell module and the second battery cell module are arranged along the width direction of the power storage device; The first conductive member, the second conductive member, the third conductive member and the fourth conductive member are located on the same side of the length direction of the power storage device; In the width direction of the power storage device, the second conductive member is located between the first conductive member and the fourth conductive member, and the third conductive member is also located between the first conductive member and the fourth conductive member.

17. The power storage device according to claim 16, characterized in that: The first battery cell module includes two battery cell groups arranged in a width direction of the power storage device and connected in series, and the second battery cell module includes two battery cell groups arranged in a width direction of the power storage device and connected in series; The first conductive member is connected to the positive electrode of the battery cell group located on the outside in the width direction of the first battery cell module; The second conductive member is connected to the negative electrode of the battery cell group located on the inner side in the width direction of the first battery cell module; The third conductive member is connected to the positive electrode of the battery cell group located on the inner side in the width direction of the second battery cell module; The fourth conductive member is connected to the negative electrode of the battery cell group located on the outside in the width direction of the second battery cell module.

18. The power storage device according to claim 16, characterized in that: The first cell module and the second cell module unit each include a plurality of cell columns, each cell column includes a plurality of cells arranged along the length direction of the power storage device, and the plurality of cell columns are arranged along the width direction of the power storage device; A plurality of battery cells in each battery cell column are connected in series, and two adjacent battery cell columns are connected in series.

19. The power storage device according to claim 18, characterized in that: The first conductive member is connected to the outermost row of cells in the first cell module in the width direction of the power storage device; The second conductive member is connected to the innermost battery cell row in the first battery cell module in the width direction of the power storage device; The third conductive member is connected to the innermost battery cell row in the second battery cell module in the width direction of the power storage device; The fourth conductive member is connected to the outermost battery cell row in the second battery cell module in the width direction of the power storage device.

20. An electrical equipment, characterized in that: It comprises an equipment body and a power storage device according to any one of claims 1 to 19, wherein the power storage device is installed on the equipment body and is used to supply power to the equipment body.

21. The electrical equipment according to claim 20, characterized in that: The electrical equipment is a vehicle, the power storage device is a battery pack, and the equipment body is the body of the vehicle.

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