Battery pack and electric equipment

Abstract

The invention relates to a battery pack and electric equipment, the battery pack is provided with a battery pack box body, an on-off device and a plurality of battery cell units, the plurality of battery cell units are arranged in the battery pack box body, the positive electrode of each battery cell unit is suitable for being electrically connected with the positive electrode end of a high-voltage distribution box, and the negative electrode of each battery cell unit is suitable for being electrically connected with the negative electrode end of the high-voltage distribution box. The negative electrode of each battery cell unit is suitable for being electrically connected with the negative electrode end of the high-voltage distribution box, the multiple battery cell units are sequentially arranged on a series circuit of the battery pack, the two ends of the series circuit are correspondingly connected to the positive electrode end and the negative electrode end of the high-voltage distribution box respectively, and the on-off device is arranged on the series circuit and used for connecting or disconnecting the series circuit. According to the battery pack, the series circuit is provided with the breaking device, one of the multiple battery cell units can be selected to be independently used or the multiple battery cell units are connected in series to be used at the same time through opening and closing of the breaking device, and therefore the battery pack can be suitable for charging platforms with different charging voltages, and discharging with different voltages can be conducted at the same time.

Description

Technical Field

[0001] The present disclosure relates to the technical field of batteries, and more particularly, to a battery pack and an electrical device. Background Art

[0002] A battery pack is a device used to provide energy for an electrical device (such as a vehicle) and is a core component of the electrical device. For a specific electrical device (such as a vehicle), once the battery pack is installed in place, it is usually only suitable for a fixed charging voltage. Although in related technologies, a booster can be used to be compatible with charging platforms (such as charging piles) of different voltages, it will increase the cost additionally and is not convenient for daily use. Summary of the Invention

[0003] The purpose of the present disclosure is to provide a battery pack and an electrical device to at least partially solve the technical problems existing in the related technologies.

[0004] To achieve the above purpose, according to the first aspect of the present disclosure, there is provided a battery pack, including a battery pack housing, a switching device, and a plurality of cell units;

[0005] The plurality of cell units are arranged in the battery pack housing;

[0006] The positive electrode of each cell unit is adapted to be electrically connected to the positive electrode terminal of the high-voltage distribution box, and the negative electrode of each cell unit is adapted to be electrically connected to the negative electrode terminal of the high-voltage distribution box;

[0007] Moreover, the plurality of cell units are arranged in series on the series circuit of the battery pack in sequence, and both ends of the series circuit are respectively connected to the positive electrode terminal and the negative electrode terminal of the high-voltage distribution box correspondingly;

[0008] The switching device is arranged on the series circuit and is used to connect or disconnect the series circuit so as to connect the plurality of cell units in series to the series circuit or disconnect the series connection between the plurality of cell units.

[0009] Optionally, the battery pack further includes the high-voltage distribution box.

[0010] Optionally, the battery pack further includes a fuse, and the fuse is arranged on the series circuit.

[0011] Optionally, the switching device is a relay.

[0012] Optionally, the battery pack further includes at least one insulating member, and the insulating member is arranged between adjacent cell units.

[0013] Optionally, the number of cell units is an even number.

[0014] Optionally, the positive and negative electrodes of the battery cell units in the plurality of battery cell units are both located on the same side of the battery pack.

[0015] Optionally, the plurality of battery cell units are arranged along the width direction of the battery pack, and each battery cell unit includes at least one battery cell group;

[0016] The battery cells in each battery cell group are arranged to extend along the length direction of the battery pack;

[0017] The positive and negative electrodes of each battery cell unit are both located on the same side in the length direction of the battery pack.

[0018] Optionally, each battery cell group includes multiple rows of battery cells arranged along the length direction of the battery pack, and each row of battery cells includes multiple battery cells arranged along the width direction of the battery pack;

[0019] In the same battery cell group, the battery cells in each row of battery cells are connected in series, and the adjacent two rows of battery cells are connected in series.

[0020] Optionally, each battery cell unit includes multiple battery cell columns, each battery cell column includes multiple battery cells arranged along the length direction of the battery pack, and the multiple battery cell columns are arranged along the width direction of the battery pack;

[0021] The multiple battery cells in each battery cell column are connected in series, and the adjacent two battery cell columns are connected in series.

[0022] Optionally, the plurality of battery cell units include a first battery cell unit and a second battery cell unit arranged adjacent to each other;

[0023] The switching device is arranged on the circuit between the negative electrode of the first battery cell unit and the positive electrode of the second battery cell.

[0024] Optionally, the first battery cell unit and the second battery cell unit are symmetrically arranged.

[0025] Optionally, the first battery cell unit and the second battery cell unit are symmetrically arranged with respect to the midline in the width direction of the battery pack.

[0026] Optionally, the battery pack further includes a first electrical connector and a second electrical connector;

[0027] The first electrical connector is adapted to electrically connect the positive electrode of the first battery cell unit to the positive terminal of the high-voltage power distribution box;

[0028] The second electrical connector is adapted to electrically connect the negative electrode of the first battery cell unit to the negative terminal of the high-voltage power distribution box.

[0029] Optionally, the battery pack further includes a third electrical connection and a fourth electrical connector;

[0030] The third electrical connector is adapted to electrically connect the positive electrode of the second battery cell unit to the positive terminal of the high-voltage distribution box;

[0031] The fourth electrical connector is adapted to electrically connect the negative electrode of the second battery cell unit to the negative terminal of the high-voltage distribution box;

[0032] The opening and closing device is arranged on the circuit between the second electrical connector and the third electrical connector.

[0033] Optionally, a fuse is further arranged on the circuit between the second electrical connector and the third electrical connector, and the fuse is connected in series with the opening and closing device.

[0034] Optionally, the first battery cell unit and the second battery cell unit are arranged along the width direction of the battery pack;

[0035] The first electrical connector, the second electrical connector, the third electrical connector and the fourth electrical connector are located on the same side in the length direction of the battery pack;

[0036] In the width direction of the battery pack, the first electrical connector and the fourth electrical connector are the two outermost electrical connectors.

[0037] Optionally, in the width direction of the battery pack, the first electrical connector and the fourth electrical connector are symmetrically arranged about the midline in the width direction of the battery pack; and / or, the second electrical connector and the third electrical connector are symmetrically arranged about the midline in the width direction of the battery pack.

[0038] Optionally, the first electrical connector has a first extension section, and the fourth electrical connector has a second extension section;

[0039] The first extension section and the second extension section extend towards each other along the width direction of the battery pack;

[0040] The first extension section is adapted to be electrically connected to the positive terminal of the high-voltage distribution box, and the second extension section is adapted to be electrically connected to the negative terminal of the high-voltage distribution box.

[0041] Optionally, the second electrical connector has a first connection section, and the third electrical connector has a second connection section;

[0042] The first connection section and the second connection section extend towards each other along the width direction of the battery pack. The first connection section is connected to one of the opening and closing device and the fuse, and the second connection section is connected to the other of the opening and closing device and the fuse.

[0043] Optionally, the first battery cell unit includes two battery cell groups arranged in series along the width direction of the battery pack; the first electrical connection member is connected to the positive electrode of the battery cell group located on the outer side of the battery pack in the width direction of the battery pack;

[0044] The second electrical connection member is connected to the negative electrode of the battery cell group located on the inner side of the battery pack in the width direction of the battery pack;

[0045] The second battery cell unit includes two battery cell groups arranged in series along the width direction of the battery pack;

[0046] The third electrical connection member is connected to the positive electrode of the battery cell group located on the inner side of the battery pack in the width direction of the battery pack;

[0047] The fourth electrical connection member is connected to the negative electrode of the battery cell group located on the outer side of the battery pack in the width direction of the battery pack.

[0048] Optionally, the battery pack further includes a plurality of jumper members and a plurality of adapter members;

[0049] The four battery cell groups include multiple rows of battery cells arranged along the length direction of the battery pack, and each row of battery cells includes multiple battery cells arranged along the width direction of the battery pack;

[0050] Each battery cell extends along the length direction of the battery pack, and the positive electrode and the negative electrode of the battery cell are arranged at both ends of the battery cell along the length direction of the battery pack. Adjacent battery cells in the same row are connected in series through the jumper member, and adjacent rows of battery cells are connected in series through the adapter member.

[0051] Optionally, the adapter member includes an adapter straight row and an adapter bent row;

[0052] The adapter straight row connects two battery cells with their narrow faces opposite to each other in the width direction of the battery pack among two adjacent rows of battery cells;

[0053] The adapter bent row connects two battery cells with their narrow faces offset in the width direction of the battery pack among two adjacent rows of battery cells.

[0054] Optionally, the second electrical connection member and the third electrical connection member are located in the middle of the width direction of the battery pack.

[0055] Optionally, both the first battery cell unit and the second battery cell unit include a plurality of battery cell columns, each battery cell column includes a plurality of battery cells arranged along the length direction of the battery pack, and the plurality of battery cell columns are arranged along the width direction of the battery pack;

[0056] The plurality of battery cells in each battery cell column are connected in series, and adjacent two battery cell columns are connected in series.

[0057] Optionally, the first electrical connector is connected to the outermost cell column of the first cell unit in the width direction of the battery pack;

[0058] The second electrical connector is connected to the innermost cell column of the first cell unit in the width direction of the battery pack;

[0059] The third electrical connector is connected to the innermost cell column of the second cell unit in the width direction of the battery pack;

[0060] The fourth electrical connector is connected to the outermost cell column of the second cell unit in the width direction of the battery pack.

[0061] Optionally, the multiple cell columns in each cell unit include at least two first cell columns, and each first cell column includes a plurality of first cells arranged along the length direction of the battery pack;

[0062] In the length direction of the battery pack, the plurality of first cells in one of the first cell columns are arranged corresponding to the plurality of first cells in another adjacent first cell column, and a plurality of cell pairs are constructed, and each cell pair includes two first cells located in different first cell columns;

[0063] The battery pack further includes a first electrical connection row and a second electrical connection row;

[0064] The two first cells in each cell pair are connected in series through the first electrical connection row, and between two adjacent cell pairs are adapted to be connected in series through the second electrical connection row.

[0065] Optionally, in the length direction of the battery pack, the positive electrodes of the two first cells in each cell pair are on the same side;

[0066] The positive electrode of one first cell of each cell pair is electrically connected to the negative electrode of the other first cell through the first electrical connection row, and the positive electrode of one of two adjacent cell pairs is electrically connected to the negative electrode of the other through the second electrical connection row.

[0067] Optionally, the multiple cell columns in each cell unit further include at least one second cell column;

[0068] The second cell column is arranged along the width direction of the battery pack with the first cell column, and the at least one second cell column is connected in series with the first cell column;

[0069] The second cell column includes a plurality of second cells arranged along the length direction of the battery pack;

[0070] The plurality of second cells in the same second cell column are connected in series.

[0071] Optionally, the battery pack further includes a plurality of third electrical connection rows, a plurality of fourth electrical connection rows, and a plurality of fifth electrical connection rows;

[0072] Two adjacent second battery cells in the same second battery cell column are connected in series through the third electrical connection member;

[0073] Two adjacent second battery cell columns are connected in series through the fourth electrical connection row;

[0074] The first battery cell column and the adjacent second battery cell column are connected in series through the fifth electrical connection row.

[0075] According to another aspect of the present disclosure, there is provided an electrical device, including a device main body and the battery pack, where the battery pack is installed on the device main body and is used to supply power to the device main body.

[0076] Through the above technical solution, by controlling the switching device to selectively connect and disconnect the series circuit, that is, through the opening and closing of the switching device, multiple battery cell units can be charged separately, or can be connected in series as a whole for charging. When multiple battery cell units are separately connected to the high-voltage distribution box for use, the battery pack can be applicable to a charging platform with a lower charging voltage, so that it can have a conventional charging mode; when multiple battery cell units are connected in series and then connected to the high-voltage distribution box, it can be applicable 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 where the battery pack can only be charged using a charging platform with a fixed voltage, the battery pack provided by the present disclosure can be applicable to charging platforms with different voltages, that is, it can be compatible with voltage platforms of multiple voltages, which is beneficial to convenient daily use. In addition, compared with the solution using a booster in the related art, the solution provided by the present disclosure is beneficial to cost reduction and convenient use.

[0077] Moreover, since multiple battery cell units in the battery pack can have different working modes, and the number of battery cell units discharging can be different under different working modes, therefore, different discharging modes can be provided, and different voltage power supply modes can be provided for the electric drive member (such as the motor of a vehicle) of the electrical device.

[0078] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification, and are used to explain the present disclosure together with the following specific implementation manners, but do not constitute a limitation to the present disclosure. In the drawings:

[0080] Figure 1is a three-dimensional structural schematic diagram of a partial structure of a battery pack provided by an exemplary embodiment of the present disclosure, wherein a high-voltage distribution box is not shown;

[0081] Figure 2 yes Figure 1 A magnified schematic diagram of part A;

[0082] Figure 3 An arrangement method of multiple electrical connectors for connecting battery cells in series and for connecting high-voltage distribution boxes in series in a battery pack provided by an exemplary embodiment of the present disclosure;

[0083] Figure 4 yes Figure 3 Schematic diagram of the cell group wiring at the transfer bend in the middle B part;

[0084] Figure 5 It is an arrangement of multiple battery cell units in a battery pack provided by an exemplary embodiment of the present disclosure, wherein four battery cell groups, a first battery cell unit and a second battery cell unit are schematically shown by frame lines;

[0085] Figure 6 is a schematic diagram of a three-dimensional structure of a battery pack provided in an exemplary embodiment of the present disclosure, wherein a high-voltage distribution box and an insulating member are shown;

[0086] Figure 7 It is a schematic diagram of the circuit principle between the battery cell unit and the high voltage matching box provided in an exemplary embodiment of the present disclosure;

[0087] Figure 8 is a schematic structural diagram of a battery cell unit in a battery pack provided in another exemplary embodiment of the present disclosure, wherein two battery cell units are shown, but a first electrical connector, a second electrical connector, a third electrical connector, and a fourth electrical connector are not shown;

[0088] Figure 9 is a schematic diagram of the structure of a battery cell unit in a battery pack provided by an exemplary embodiment of the present disclosure, wherein a dividing line between two battery cell units 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;

[0089] Figure 10 yes Figure 9 A magnified schematic diagram of part A;

[0090] Figure 11 yes Figure 9 The enlarged schematic diagram of part A in the figure shows the circuit paths of the two first battery cell columns with dotted lines;

[0091] Figure 12 yes Figure 9 Schematic diagram of the circuit path of a single battery cell, with the positive and negative poles at the same end.

[0092] Description of Reference Numerals

[0093] 10 - Breaking device, 20 - Battery cell unit, 21 - First battery cell unit, 22 - Second battery cell unit, 23 - Battery cell, 24 - Battery cell group, 25 - First battery cell row, 251 - First battery cell, 252 - Battery cell pair, 26 - Second battery cell row, 261 - Second battery cell, 30 - High - voltage distribution box, 40 - Fuse, 51 - First electrical connector, 511 - First extension section, 52 - Second electrical connector, 521 - First connection section, 53 - Third electrical connector, 531 - Second connection section, 54 - Fourth electrical connector, 541 - Second extension section, 55 - Jumper, 56 - Adapter, 561 - Adapter straight row, 562 - Adapter bent row, 571 - First electrical connection row, 5711 - First section, 5712 - Second section, 5713 - Third section, 572 - Second electrical connection row, 5721 - Fourth section, 5722 - Fifth section, 5723 - Sixth section, 573 - Third electrical connection row, 574 - Fourth electrical connection row, 575 - Fifth electrical connection row, 60 - Insulating part, 70 - Battery pack housing. Detailed Embodiment

[0094] The following is a detailed description of the specific embodiments of the present disclosure with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present disclosure, and are not intended to limit the present disclosure.

[0095] In the present disclosure, it should be understood that, in the present disclosure, unless otherwise stated, the orientation terms such as "upper", "lower", etc. indicate the orientation or positional relationship defined based on the drawing direction shown in the corresponding drawings. It is 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 orientation, as well as a specific orientation structure and operation. Therefore, it should not be construed as a limitation of the present disclosure. The terms "inner" and "outer" can refer to the inside and outside of the corresponding structural contour. The "width direction" and "length direction" can be referred to Figure 1 , Figure 6 , Figure 8 and Figure 9 the width direction and length direction shown. In addition, it should be noted that the terms such as "first", "second", etc. are used to distinguish one element from another, and do not have sequentiality and importance. In addition, in the description with reference to the drawings, the same reference numerals in different drawings represent the same elements.

[0096] In the description of the present disclosure, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "connected", "linked", 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 those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0097] It should be noted that all actions of obtaining signals, information, or data in the present disclosure are carried out on the premise of complying with the corresponding data protection regulations and policies of the country where the location is located and with the authorization given by the owner of the corresponding device.

[0098] It is found that in the related art, the reason why electrical equipment such as vehicles cannot be applied to voltage platforms of other values is that each battery pack only has one charging voltage, that is, it is only applicable to charging platforms (such as charging piles) that use a specific charging voltage. For example, it is only applicable to charging platforms that use a 400V (voltage) charging platform or an 800V charging platform. The traditional 400V charging platform is limited by hardware capabilities and cannot achieve a very high charging power. Generally, the charging time is more than 30 minutes. While 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 and cannot be compatible with 800V and other voltage platforms. Although in the related art, a step-up transformer can be carried along with the vehicle to be compatible with most 400V charging platforms (such as charging piles) on the market, it will increase the cost additionally and is not convenient for daily use.

[0099] In view of this, in combination with the design of the battery pack, this patent proposes a battery pack that can be applicable to multiple charging voltages to be compatible with different charging platforms, and this battery pack can have conventional charging and fast charging modes.

[0100] Specifically, as Figures 1 to 12As shown, the present disclosure provides a battery pack including a battery pack housing 70, a switching device 10, and a plurality of battery cell units 20. The plurality of battery cell units 20 are arranged within the battery pack housing 70, and an accommodation cavity for the battery cells may be formed inside the battery pack housing 70, and the plurality of battery cell units 20 may be arranged within the accommodation cavity for the battery cells. The positive electrode of each battery cell unit 20 is adapted to be electrically connected to the positive terminal of a high-voltage power distribution box 30 (BDU, Battery Disconnect Unit), and the negative electrode of each battery cell unit 20 is adapted to be electrically connected to the negative terminal of the high-voltage power distribution box 30. Moreover, the plurality of battery cell units 20 are arranged in series on the series circuit of the battery pack, and the two ends of the series circuit are respectively connected to the positive terminal and the negative terminal of the high-voltage power distribution box 30; the switching device 10 is arranged on the series circuit of the plurality of battery cell units 20 and is used for connecting or disconnecting the series circuit between the plurality of battery cell units 20 so as to connect the plurality of battery cell units 20 in series to the series circuit or disconnect the series connection between the plurality of battery cell units 20.

[0101] In the present disclosure, the high-voltage power distribution box 30 is a battery energy distribution unit, which is an important component on the high-voltage circuit of an electrical device (such as a vehicle). It can distribute the high-voltage electricity of the battery pack to the electrical device, so that the battery pack can supply power to the electrical device. In addition, the high-voltage power distribution box 30 can distribute the high-voltage charging current of the AC and DC charging interfaces to the battery pack to charge the battery pack.

[0102] By the above technical solution, by controlling the switching device 10 to selectively connect and disconnect the series circuit, that is, by the opening and closing of the switching device 10, the plurality of battery cell units 20 can be charged separately or connected in series as a whole for charging. When the plurality of battery cell units 20 can be separately connected to the high-voltage power distribution box 30 for use, the battery pack can be applicable to a charging platform with a relatively low charging voltage, and thus can have a conventional charging mode; when the plurality of battery cell units 20 are connected in series to the high-voltage power distribution box 30, it can be applicable to a charging platform with a relatively high charging voltage, and thus can have a fast charging mode. Therefore, compared with the solution in the related art where the battery pack can only be charged using a charging platform with a fixed voltage, the battery pack provided by the present disclosure can be applicable to charging platforms with different voltages, that is, it can be compatible with voltage platforms of multiple voltages, which is beneficial to convenient daily use. In addition, compared with the solution using a booster in the related art, the solution provided by the present disclosure is beneficial to cost reduction and convenient use.

[0103] Moreover, multiple battery cell units 20 can be placed in a single battery pack housing 70 within the battery pack of the present disclosure. The multiple battery cell units 20 can be used in series or individually. Since the multiple battery cell units 20 are placed in a single battery pack housing 70, it is not necessary to arrange a battery pack housing 70 for each battery cell unit 20. Moreover, the multiple battery cell units 20 can share components (such as a heat exchange structure). Therefore, the space of the battery pack can be saved, which is beneficial to improving the energy density of the battery pack. Since the multiple battery cell units 20 in the battery pack can have different operating modes, the number of battery cell units 20 discharging can be different in different operating modes. Therefore, different discharge modes can be provided, and different voltage power supply modes can be provided for the electric drive components of the electrical equipment (such as the motor of a vehicle).

[0104] It can be understood that the present disclosure does not limit the number of the multiple battery cell units 20. The multiple battery cell units 20 can be designed to have two or more. The number of battery cells 23 included in each battery cell unit 20 is also not limited. It can be designed according to the voltage of the charging platform to be compatible, as long as the requirements of voltage conversion and compatibility with different voltage charging platforms can be met. Optionally, the voltage at which the battery pack is suitable for charging or discharging can be 400V to 800V, including 400V and 800V. For example, currently, it is necessary to be compatible with charging piles of 400V and 800V. In order to adapt to their voltages, two battery cell units 20 suitable for a 400V charging platform can be designed, or four battery cell units 20 suitable for a 200V charging platform can also be designed, as long as the requirements of being compatible with different voltage charging platforms can be met. The voltage applicable to a single designed battery cell unit 20 is not limited.

[0105] For example, two battery cell units 20 suitable for a 400V charging platform are set. When the connected charging pile is 400V, only a single battery cell unit 20 needs to be charged. At this time, the disconnecting device 10 between the two battery cell units 20 can be disconnected. The positive and negative electrodes of one of the battery cell units 20 are connected to the positive and negative ends of the high-voltage distribution box 30 to complete the circuit connection, and the other battery cell unit 20 does not charge. When the connected charging pile is 800V, the two battery cell units 20 work in series. At this time, the disconnecting device 10 between the two battery cell units 20 is closed. The positive electrode of one of the battery cell units 20 is connected to the negative electrode of the other battery cell unit 20. The positive and negative ends of the total circuit after series connection are connected to the positive and negative ends of the high-voltage distribution box 30 to complete the circuit connection. At this time, both of the two battery cell units 20 can be charged. In this way, charging platforms (charging piles) of 400V and 800V can be compatible.

[0106] The present disclosure does not limit the type of the switching device 10, which may be a relay, an electronic switch, a thyristor, a switching diode, etc. As long as the switching device 10 can perform a circuit breaking function in the series circuit when a single battery cell unit 20 needs to work, and can perform a circuit closing function in the series circuit when multiple battery cell units 20 need to work.

[0107] In an embodiment where the switching device 10 is a relay, the relay can significantly accelerate the switching time, eliminate the arc and noise existing in the electrical components. Essentially, it has better reliability and predictability and a longer service life.

[0108] In the present disclosure, the high-voltage distribution box 30 may be a part of the battery pack, or may not belong to the battery pack but be an electrical component connected to the battery pack. The present disclosure does not limit this. As Figure 6 shown, in an embodiment of the present disclosure, the battery pack may include the high-voltage distribution box 30, that is, in Figure 6 the high-voltage distribution box 30 belongs to a part of the battery pack.

[0109] In the present disclosure, as Figure 2 、 Figure 3 and Figure 9 shown, the battery pack may further include a fuse 40, and the fuse 40 is arranged on the series circuit where multiple battery cell units 20 are located. Due to the arrangement of the fuse 40, when a short circuit occurs in the high-voltage circuit of the battery pack, in addition to disconnecting the series circuit through the above-mentioned switching device 10 to disconnect the high-voltage circuit of the battery pack, the fuse 40 can also be used to timely disconnect the high-voltage circuit, which can avoid the risk of thermal runaway caused by high-voltage arcing and improve the safety performance of the battery pack.

[0110] To avoid mutual influence between the battery cell units 20, as Figure 6 shown, the battery pack may further include at least one insulating member 60, and the insulating member 60 is arranged between adjacent battery cell units 20. By arranging the insulating member 60 to set an isolation boundary between the battery cell units 20 for physical isolation, when one of the battery cell units 20 has a thermal runaway, the insulating member 60 can separate the battery cell units 20, and the spread of the thermal runaway to other battery cell units 20 can be avoided, which can ensure that other battery cell units 20 can work normally, such as continuously discharging externally, thus being beneficial to improving the thermal runaway protection of the battery pack.

[0111] For example, in as Figures 1 to 3In the embodiment where the battery cell unit 20 shown includes a first battery cell unit 21 and a second battery cell unit 22, since an isolation boundary is provided between the first battery cell unit 21 and the second battery cell unit 22 to complete physical isolation, it can be isolated at the first moment of thermal runaway. If it is effectively isolated within one battery cell unit 20 (such as the first battery cell unit 21), it is not easy to affect another independent battery cell unit 20 (such as the second battery cell unit 22).

[0112] The present disclosure does not limit the number of the insulating members 60. In the embodiment as shown in Figure 6 the number of the battery cell units 20 is two, and the number of the insulating members 60 is one. The insulating member 60 divides the battery pack housing 70 (battery tray) into two symmetric parts in the width direction of the battery pack.

[0113] In the present disclosure, the number of the multiple battery cell units 20 can be an even number. Setting the number of the battery cell units 20 as an even number facilitates the overall layout of the battery pack. For example, multiple battery cell units 20 can be symmetrically arranged along the midline of the battery pack.

[0114] To improve the space utilization rate inside the battery pack and facilitate the connection to the high-voltage distribution box 30, as shown in Figure 2 and Figure 9 optionally, both the positive electrode and the negative electrode of the battery cell unit 20 in the multiple battery cell units 20 are located on the same side of the battery pack, that is, the electrodes (positive electrode or negative electrode) of all the battery cell units 20 in the multiple battery cell units 20 are located on the same side of the battery. The battery cell unit 20 includes a plurality of battery cells 23 connected in series. The series-connected battery cells 23 are connected end to end by the positive and negative electrodes. The positive and negative electrodes of the battery cell unit 20 here are the head and tail positions of the series-connected battery cells 23. When the battery cell unit 20 is in use, its positive and negative electrodes need to be connected to the high-voltage distribution box 30. Setting both the positive and negative electrodes of the battery cell unit 20 on the same side of the battery pack enables the positive and negative electrodes of the battery cell unit 20 to be connected nearby when connecting to the high-voltage distribution box 30, without the need to design a connection row with a large length (used when the positive and negative electrodes of the battery cell unit 20 are located on different sides of the battery pack), which is convenient for integration and reasonable arrangement of the electrical components (such as the first electrical connector 51, the second electrical connector 52, the third electrical connector 53, the fourth electrical connector 54, the switching device 10, the fuse 40, etc.) between the battery cell unit 20 and the high-voltage distribution box 30, conducive to saving space, simplifying the structure and facilitating connection. In addition, during maintenance, since the positive and negative electrodes are both set at the same end, when opening the electrical equipment for maintenance, only one side needs to be opened for inspection, which is convenient for maintenance.

[0115] The present disclosure does not limit the specific layout orientation of the positive and negative electrodes of the battery cell unit 20 on the battery pack, which can be designed according to the specific layout of the battery cells 23 in the battery cell unit 20. As shown in Figure 1 、 Figure 2 、Figure 8 and Figure 9 As shown in Figure 9 , a plurality of battery cell units 20 are arranged in the width direction of the battery pack. Each battery cell unit 20 includes at least one battery cell group 24. The battery cells 23 in each battery cell group 24 extend in the length direction of the battery pack. The positive and negative electrodes of each battery cell unit 20 are both located on the same side in the length direction of the battery pack. In other words, in the embodiments shown in Figure 1 , Figure 2 , Figure 8 and Figure 9 , the wide surface (large surface) of each battery cell 23 faces the width direction of the battery pack, the narrow surface (small surface) of each battery cell 23 faces the length direction of the battery pack, and the positive and negative electrodes of the battery cell unit 20 are both located in the direction corresponding to the narrow surface of the battery cell 23.

[0116] The present disclosure does not limit the number of battery cells 23 in each battery cell group 24. As shown in Figure 1 and Figure 2 , each battery cell group 24 includes multiple rows of battery cells 23 arranged in the length direction of the battery pack. Each row of battery cells includes multiple battery cells 23 arranged in the width direction of the battery pack. 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 23 in adjacent two rows are connected in series.

[0117] As mentioned above, the present disclosure does not limit the number of battery cell units 20. As an optional embodiment, as shown in Figure 1 and Figure 2 , a plurality of battery cell units 20 may include a first battery cell unit 21 and a second battery cell unit 22. The positive electrode of the first battery cell unit 21 is adapted to be electrically connected to the positive terminal of the high-voltage distribution box 30, and the negative electrode of the first battery cell unit 21 is adapted to be electrically connected to the negative terminal of the high-voltage distribution box 30; the positive electrode of the second battery cell unit 22 is adapted to be electrically connected to the positive terminal of the high-voltage distribution box 30, and the negative electrode of the second battery cell unit 22 is adapted to be electrically connected to the negative terminal of the high-voltage distribution box 30. The switching device 10 is arranged on the circuit between the negative electrode of the first battery cell unit 21 and the positive electrode of the second battery cell 23.

[0118] That is, the number of multiple battery cell units 20 can be two. The two battery cell units 20 are respectively a first battery cell unit 21 and a second battery cell unit 22. The first battery cell unit 21 and the second battery cell unit 22 can be connected in series. An opening and closing device 10 is arranged on the series circuit. When the opening and closing device 10 is disconnected, the positive electrode and the negative electrode of the first battery cell unit 21 are respectively connected to the positive and negative ends of the high-voltage distribution box 30, or the positive electrode and the negative electrode of the second battery cell unit 22 are respectively connected to the positive and negative ends of the high-voltage distribution box 30. The first battery cell unit 21 or the second battery cell unit 22 can be selected for separate charging or discharging. When the opening and closing device 10 is closed, the positive electrode of the first battery cell unit 21 is connected to the positive extreme of the high-voltage distribution box 30, the negative electrode of the first battery cell unit 21 is connected to the positive electrode of the second battery cell unit 22 through the closed opening and closing device 10, and the negative electrode of the second battery cell unit 22 is connected to the positive extreme of the high-voltage distribution box 30. At this time, the first battery cell unit 21 and the second battery cell unit 22 are used in series.

[0119] To simplify the structure and improve the space utilization rate of the battery cell accommodation cavity in the battery pack housing 70, the first battery cell unit 21 and the second battery cell unit 22 can be symmetrically arranged. For example, as Figure 6 shown, the insulating member 60 divides the battery cell accommodation cavity of the battery pack housing 70 into two chambers. The first battery cell unit 21 and the second battery cell unit 22 are located in the corresponding chambers and are symmetrically arranged, so as to facilitate the design of the chambers to accommodate the first battery cell unit 21 and the second battery cell unit 22.

[0120] It can be understood that the symmetrical arrangement of the first battery cell unit 21 and the second battery cell unit 22 means that the battery cells 23 of the first battery cell unit 21 and the battery cells 23 of the second battery cell unit 22 are at least symmetrically arranged. As for the relevant electrical connection components or electrical connection rows of the first battery cell unit 21 (such as the first electrical connection component 51, the second electrical connection component 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 below) and the relevant electrical connection components of the second battery cell unit 22 (such as the third electrical connection component 53, the fourth electrical connection component 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 below), they can be symmetrically arranged or asymmetrically arranged. The present disclosure does not limit this.

[0121] Optionally, the electrical connection components or electrical connection rows in each of the first battery cell unit 21 and the second battery cell unit 22 can be symmetrically arranged. With such a design, it is convenient for the arrangement and assembly of the electrical connection components or electrical connection rows in the battery pack.

[0122] In the present disclosure, according to the arrangement of the battery cells 23 in the battery cell unit 20, the first battery cell unit 21 and the second battery cell unit 22 may be symmetrically arranged with respect to any direction. For example, they may be symmetric with respect to the length direction of the battery pack, or symmetric with respect to the width direction of the battery pack, or symmetric with respect to other suitable directions. The present disclosure does not limit this.

[0123] Optionally, as Figure 1 and Figure 6 shown, the first battery cell unit 21 and the second battery cell unit 22 are symmetrically arranged with respect to the midline in the width direction of the battery pack. The symmetrical arrangement along the midline in the width direction of the battery pack not only ensures a reasonable layout of the battery pack, but also, in combination with the arrangement direction of the battery cells 23, facilitates setting the positive and negative electrodes of the first battery cell unit 21 and the second battery cell unit 22 on one side in the length direction of the battery pack. At this time, referring to Figure 6 , the insulating member 60 extends substantially along the length direction of the battery pack and is located on the center line in the width direction of the battery pack.

[0124] In the present disclosure, in order to facilitate the electrical connection between the first battery cell unit 21 and the second battery cell unit 22 and the high-voltage distribution box 30, as Figures 1 to 3 , Figure 9 shown, the battery pack further includes a first electrical connector 51 and a second electrical connector 52. The first electrical connector 51 is adapted to electrically connect the positive electrode of the first battery cell unit 21 to the positive terminal of the high-voltage distribution box 30, and the second electrical connector 52 is adapted to electrically connect the negative electrode of the first battery cell unit 21 to the negative terminal of the high-voltage distribution box 30.

[0125] Among them, the first electrical connector 51 and the second electrical connector 52 include, but are not limited to, connection bars, connection wires, etc. Among them, the first electrical connector 51 can be used to electrically connect the positive electrode of the first battery cell unit 21 to the positive terminal of the high-voltage distribution box 30 when the first battery cell unit 21 is used alone, and can also be used to electrically connect the positive electrode of the first battery cell unit 21 to the positive terminal of the high-voltage distribution box 30 when the first battery cell unit 21 and the second battery cell unit 22 are connected in series. The second electrical connector 52 is used to connect the negative electrode of the first battery cell unit 21 to the negative terminal of the high-voltage distribution box 30 when the first battery cell unit 21 is used alone.

[0126] As Figures 1 to 3 , Figure 9 shown, the battery pack may further include a third electrical connector 53 and a fourth electrical connector 54. The third electrical connector 53 is adapted to electrically connect the positive electrode of the second battery cell unit 22 to the positive terminal of the high-voltage distribution box 30, and the fourth electrical connector 54 is adapted to electrically connect the negative electrode of the second battery cell unit 22 to the negative terminal of the high-voltage distribution box 30.

[0127] Among them, the third electrical connector 53 and the fourth electrical connector 54 include, but are not limited to, connection bars, connection wires, etc. The third electrical connector 53 is used to connect the positive electrode of the second battery cell unit 22 to the positive terminal of the high-voltage distribution box 30 when the second battery cell unit 22 is used alone. The fourth electrical connector 54 can be used to electrically connect the negative electrode of the second battery cell unit 22 to the negative terminal of the high-voltage distribution box 30 when the second battery cell unit 22 is used alone, or can be used to electrically connect the negative electrode of the second battery cell unit 22 to the negative terminal of the high-voltage distribution box 30 when the first battery cell unit 21 and the second battery cell unit 22 are connected in series.

[0128] In the present disclosure, optionally, the first electrical connector 51, the second electrical connector 52, the third electrical connector 53, and the fourth electrical connector 54 can be copper-aluminum composite bars and can be welded to the corresponding electrodes of the battery cells.

[0129] Such as Figures 1 to 3 、 Figure 9 shown, the above-mentioned switching device 10 can be provided on the circuit between the second electrical connector 52 and the third electrical connector 53. When the first battery cell unit 21 needs to be used alone or when the first battery cell unit 21 is used alone, the switching device 10 can be disconnected. When the first battery cell unit 21 and the second battery cell unit 22 need to be used in series, the switching device 10 can be closed.

[0130] In addition, such as Figures 1 to 3 、 Figure 9 shown, the above-mentioned fuse 40 can also be provided on the circuit between the second electrical connector 52 and the third electrical connector 53, that is, the fuse 40 and the switching device 10 are connected in series between the second electrical connector 52 and the third electrical connector 53.

[0131] Such as Figures 1 to 3 、 Figure 9 shown, the first battery cell unit 21 and the second battery cell unit 22 can be arranged along the width direction of the battery pack; the first electrical connector 51, the second electrical connector 52, the third electrical connector 53, and the fourth electrical connector 54 are located on the same side in the length direction of the battery pack. In the width direction of the battery pack, the first electrical connector 51 and the fourth electrical connector 54 are the two outermost electrical connectors. That is, in the width direction of the battery pack, the second electrical connector 52 is located between the first electrical connector 51 and the fourth electrical connector 54, and the third electrical connector 53 is located between the first electrical connector 51 and the fourth electrical connector 54. With such a design, all the connectors are arranged on the same side, which is convenient for layout and installation in the initial stage and convenient for maintenance and replacement in the later stage.

[0132] Moreover, since the first electrical connector 51 and the fourth electrical connector 54 are the two outermost electrical connectors, and the second electrical connector 52 and the third electrical connector 53 are the two middle electrical connectors, it is convenient to arrange an opening and closing device 10 and a fuse 40 as shown in Figure 1 on the circuit between the second electrical connector 52 and the third electrical connector 53.

[0133] As shown in Figure 1 , Figure 2 and Figure 9 , optionally, in the width direction of the battery pack, the first electrical connector 51 and the fourth electrical connector 54 can be symmetrically arranged with respect to the midline in the width direction of the battery pack; the second electrical connector 52 and the third electrical connector 53 can be symmetrically arranged with respect to the midline in the width direction of the battery pack. The symmetrical arrangement can simplify the structure, facilitate space saving, and also facilitate the connection of each electrical connector to the corresponding electrical component.

[0134] For example, when the first battery cell unit 21 is used alone, the first electrical connector 51 and the second electrical connector 52 on the first battery cell unit 21 are connected to the high-voltage distribution box 30. Since the first electrical connector 51 and the fourth electrical connector 54, and the second electrical connector 52 and the third electrical connector 53 are all symmetrically arranged with respect to the midline in the width direction of the battery pack, there is no interference between the first electrical connector 51 and the second electrical connector 52 on the first battery cell unit 21 and the third electrical connector 53 and the fourth electrical connector when connecting to the high-voltage distribution box 30. Moreover, the first battery cell unit 21 and the second battery cell unit 20 are also symmetrically arranged with respect to the midline in the width direction of the battery pack, which can ensure mutual independence when used alone and also ensure neat and reasonable arrangement within the battery pack.

[0135] As shown in Figure 2 and Figure 3 , in an embodiment of the present disclosure, the first electrical connector 51 has a first extension section 511, and the fourth electrical connector 54 has a second extension section 541. The first extension section 511 and the second extension section 541 extend towards each other in the width direction of the battery pack. The first extension section 511 is adapted to be electrically connected to the positive terminal of the high-voltage distribution box 30, and the second extension section 541 is adapted to be electrically connected to the negative terminal of the high-voltage distribution box 30. Such an arrangement can make the first electrical connector 51 and the fourth electrical connector 54 have connection points close to the middle of the battery pack, thus facilitating the connection of the high-voltage distribution box 30. As shown in Figure 2 and Figure 3As shown, the second electrical connector 52 has a first connection section 521, and the third electrical connector 53 has a second connection section 531. The first connection section 521 and the second connection section 531 extend towards each other along the width direction of the battery pack. The first connection section 521 is connected to one of the opening and closing device 10 and the fuse 40, and the second connection section 531 is connected to the other of the opening and closing device 10 and the fuse 40. Optionally, the first connection section 521 is connected to the fuse 40, and the second connection section 531 is connected to the opening and closing device 10. With such an arrangement, it is convenient to concentrate the opening and closing device 10 and the fuse 40 in the middle of the width direction of the battery pack, thereby facilitating the connection of the high-voltage distribution box 30 and improving the position integration degree of the electrical components between the battery cell unit 20 and the high-voltage distribution box 30.

[0136] In the present disclosure, the first electrical connector 51 may further include a first connection portion connected to the positive electrode of the first battery cell unit 21, and this first connection portion is connected to the first extension section 511. The fourth electrical connector 54 may further include a second connection portion connected to the negative electrode of the first battery cell unit 21, and this second connection portion is connected to the second extension section 541.

[0137] The present disclosure does not limit the number of battery cell groups 24 in the first battery cell unit 21 and the second battery cell unit 22, such as Figure 1 and Figure 2 As shown, in an embodiment of the present disclosure, the first battery cell unit 21 includes two battery cell groups 24 arranged in series along the width direction of the battery pack, and the second battery cell unit 22 includes two battery cell groups 24 arranged in series along the width direction of the battery pack. The first electrical connector 51 is connected to the positive electrode of the battery cell group 24 located outside the width direction of the battery pack in the first battery cell unit 21, the second electrical connector 52 is connected to the negative electrode of the battery cell group 24 located inside the width direction of the battery pack in the first battery cell unit 21, the third electrical connector 53 is connected to the positive electrode of the battery cell group 24 located inside the width direction of the battery pack in the second battery cell unit 22, and the fourth electrical connector 54 is connected to the negative electrode of the battery cell group 24 located outside the width direction of the battery pack in the second battery cell unit 22.

[0138] In this way, when the first battery cell unit 21 works alone, the two battery cell groups 24 in the first battery cell unit 21 are connected in series, and can be electrically connected to the positive extreme and the negative extreme of the high-voltage distribution box 30 through the first electrical connector 51 and the second electrical connector 52 respectively. When the second battery cell unit 22 works alone, the two battery cell groups 24 in the second battery cell unit 22 are connected in series, and can be electrically connected to the positive extreme and the negative extreme of the high-voltage distribution box 30 through the third electrical connector 53 and the fourth electrical connector 54 respectively.

[0139] When the first battery cell unit 21 and the second battery cell unit 22 are connected in series, two battery cell groups 24 in the first battery cell unit 21 are connected in series, two battery cell groups 24 in the second battery cell unit 22 are connected in series, and the battery cell groups 24 adjacent to the second battery cell unit 22 in the first battery cell unit 21 and the battery cell groups 24 adjacent to the first battery cell unit 21 in the second battery cell unit 22 can be connected in series through the second electrical connector 52 and the third electrical connector 53. The battery cell group 24 in the first battery cell unit 21 that is far from the second battery cell unit 22 can be connected to the positive terminal of the high-voltage power distribution box 30 through the first electrical connector 51, and the battery cell group 24 in the second battery cell unit 22 that is far from the first battery cell unit 21 is connected to the negative terminal of the high-voltage power distribution box 30 through the fourth electrical connector 54.

[0140] The present disclosure does not limit the number of battery cells in each battery cell group 24. For example, 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 battery pack. Each row of battery cells includes multiple battery cells 23 arranged along the width direction of the battery pack. Each battery cell 23 extends along the length direction of the battery pack. In the same battery cell group 24, the battery cells 23 in each row are connected in series, and the adjacent rows of battery cells are connected in series.

[0141] The present disclosure does not limit the series connection method between the battery cells 23 in each row of battery cells, nor does it limit the series connection method between adjacent rows of battery cells. For example, Figures 3 to 5 as shown, the battery pack may further include a plurality of jumper connectors 55 and adapter connectors 56. The adjacent battery cells 23 in the same row of battery cells are connected in series through the jumper connectors 55, and the adjacent rows of battery cells 23 are connected in series through the adapter connectors 56. In the Figures 1 to 5 embodiment shown, in the same row of battery cells, the adjacent battery cells 23 face each other with their wide sides, and in the adjacent two rows of battery cells in the same battery cell group 24, the adjacent battery cells 23 face each other with their narrow sides.

[0142] Among them, the jumper connectors 55 and the adapter connectors 56 include, but are not limited to, electrical connection rows, electrical connection sheets, etc. For example, both the jumper connectors 55 and the adapter connectors 56 can be made of aluminum bars and can be connected to the positive or negative electrode of the battery cell 23 by welding.

[0143] To ensure that the positive and negative electrodes of the first battery cell unit 21 and the second battery cell unit 22 can be located on the same side of the battery pack, for example, Figures 3 to 5 as shown, the adapter connector 56 may include an adapter straight row 561 and an adapter bent row 562. The adapter straight row 561 connects two battery cells 23 whose narrow sides face each other in the width direction of the battery pack among the adjacent two rows of battery cells, and the adapter bent row 562 connects the positive and negative electrodes of two battery cells 23 whose narrow sides are in the width direction of the battery pack among the adjacent two rows of battery cells. Here, the positive electrode orientations of the two battery cells 23 are on the same side.

[0144] In this way, the transfer straight row 561 can directly connect the battery cells 23 with their narrow faces facing each other in adjacent columns to achieve a series connection effect; the transfer bent row 562 can bridge two battery cells 23 with their wide faces facing each other and the positive electrodes facing the same side. With such a setting, as Figure 4 shown, it can be ensured that the positive and negative electrodes after connecting the two battery cells 23 are located on opposite sides in the length direction of the battery pack, so as to facilitate connection with other battery cells 23 (the number is odd), and make the electrodes (such as positive and negative electrodes) of all connected battery cells 23 located at the same end in the length direction of the battery pack. The width direction of the battery pack.

[0145] It can be understood that in the present disclosure, the wide face of the battery cell 23 refers to the face with a relatively larger area among the multiple faces of the battery cell 23 in the length direction of the battery pack. For example, in the installation state where the battery pack is installed at the bottom of the vehicle, the wide face of the battery cell 23 is the face defined by the sides in the length direction and height direction of the battery cell 23. The narrow face of the battery cell 23 is the face defined by the sides in the width direction and height direction of the battery cell 23.

[0146] The present disclosure does not limit the specific shapes of the bridging member 55, the transfer straight row 561, and the transfer bent row 562. Optionally, as Figures 3 to 5 shown, the bridging member 55 and the transfer straight row 561 can be in a "one" shape, and the transfer bent row 562 can be or approximately in a "Z" shape to facilitate bridging the battery cells 23 with their narrow faces misaligned relative to each other in adjacent columns.

[0147] It can be understood that when it is necessary to design such that the electrodes (positive and negative electrodes) of multiple battery cell units 20 are all arranged on the same side of the battery pack, and the first battery cell unit 21 is provided with two battery cell groups 24, and the second battery cell unit 22 is provided with two battery cell groups 24, within the same battery cell unit, the positive electrode can be wired from one battery cell group 24 and then looped back from the other battery cell group 24.

[0148] As Figures 3 to 5 shown, the connection schematic diagram of the partial circuit of one battery cell unit (the first battery cell unit 21) is shown by the dashed arrow.

[0149] In another embodiment of the present disclosure, as Figures 8 to 12 shown, the second electrical connector 52 and the third electrical connector 53 are located in the middle of the width direction of the battery pack. Since when two battery cell units 20 are used in series, the first battery cell unit 21 and the second battery cell unit 22 are connected through the second electrical connector 52 and the third electrical connector 53, with such a design, it can facilitate the integration of the connection of the electrodes of the two battery cell units 20.

[0150] In the present disclosure, optionally, both the first battery cell unit 21 and the second battery cell unit 22 include a plurality of battery cell columns, each battery cell column includes a plurality of battery cells 23 arranged along the length direction of the battery pack, and the plurality of battery cell columns are arranged along the width direction of the battery pack; the plurality of battery cells 23 in each battery cell column are connected in series, and the adjacent two battery cell columns are connected in series. Among them, a battery cell column can be formed by connecting in series a plurality of battery cells 23 arranged along the length direction of the battery pack, and the plurality of battery cell columns are connected in series to form the battery cell unit 20.

[0151] In the present disclosure, optionally, as Figure 9 shown, the first electrical connector 51 is connected to the battery cell column located on the outermost side in the width direction of the battery pack in the first battery cell unit 21, the second electrical connector 52 is connected to the battery cell column located on the innermost side in the width direction of the battery pack in the first battery cell unit 21, the third electrical connector 53 is connected to the battery cell column located on the innermost side in the width direction of the battery pack in the second battery cell unit 22, and the fourth electrical connector 54 is connected to the battery cell column located on the outermost side in the width direction of the battery pack in the second battery cell unit 22. Since the third electrical connector 53 and the second electrical connector 52 are connected in series when the first battery cell unit 21 and the second battery cell unit 22 are used in series, such a design facilitates the connection opening and closing device 10 and the fuse 40 thereof. As Figure 9 shown, the second electrical connector 52 is connected to the battery cell column located on the innermost side in the width direction of the battery pack in the first battery cell unit 21, the third electrical connector 53 is connected to the battery cell column located on the innermost side in the width direction of the battery pack in the second battery cell unit 22, and the positions of the third electrical connector 53 and the second electrical connector 52 are concentrated, which facilitates the arrangement of the positions of the opening and closing device 10 and the fuse 40.

[0152] The outermost battery cell column here refers to the two battery cell columns with the farthest distance in the width direction of the battery pack among all the battery cell columns of the two battery cell units 20 (the first battery cell unit 21 and the second battery cell unit 22). The innermost battery cell column refers to the two battery cell columns with the closest distance in the width direction of the battery pack among all the battery cell columns of the two battery cell units 20.

[0153] In the present disclosure, optionally, as Figures 9 to 11As shown, the multiple cell columns in each cell unit 20 include at least two first cell columns 25. Each first cell column 25 includes a plurality of first cells 251 arranged along the length direction of the battery pack. In the length direction of the battery pack, the plurality of first cells 251 in one of the first cell columns 25 are arranged corresponding to the plurality of first cells 251 in an adjacent first cell column 25, and a plurality of cell pairs 252 are constructed. Each cell pair 252 includes two first cells 251 located in different first cell columns 25. The battery pack further includes a first electrical connection row 571 and a second electrical connection row 572. The two first cells 251 in each cell 252 are connected in series through the first electrical connection row 571, and adjacent two cell pairs 252 are adapted to be connected in series through the second electrical connection row 572.

[0154] Wherein, the cell unit 20 can be formed by connecting a plurality of cells in series. All the cells within one cell unit 20 can be connected in series, and the cell unit 20 has a positive electrode and a negative electrode connected to the high-voltage distribution box 30. A cell pair 252 includes two first cells 251 arranged along the width direction of the battery pack. The function of the first electrical connection row 571 is to connect the two first cells 251 in the cell pair 252 in series, so that the positive electrode and the negative electrode after the series connection of the two first cells 251 arranged along the width direction of the battery pack are at opposite ends in the length direction of the battery pack, so that the positive and negative electrodes after the series connection of adjacent cell columns are at opposite ends in the length direction of the battery pack.

[0155] Since the cells 23 in a single cell column are connected in series and have a circuit path along the length direction of the battery pack, after two adjacent cell columns are connected in series, the circuit path has a turning path (the circuit paths at the ends of the two cell columns). Therefore, after the two cell columns are connected in series, the positive electrode and the negative electrode of the circuit path here can be at the same end. By analogy, the circuit paths of the even-numbered cell columns can all make the positive electrode and the negative electrode of the total circuit path at the same end. Therefore, the positive electrode and the negative electrode of the total circuit path of the odd-numbered circuit paths are at opposite ends in the length direction of the battery pack.

[0156] Such as Figure 11 and Figure 12 As shown, this design is equivalent to connecting the circuit paths in two first cell columns 251 in series into a circuit path without a turning path. Therefore, after this circuit path is connected in series with the circuit paths of other odd-numbered cell columns, the positive and negative electrodes of the total circuit path can be at the same end of the battery pack, which is convenient for arranging the electrodes of the battery pack.

[0157] In summary, in the battery pack provided by the present disclosure, adjacent first battery cells 251 in adjacent first battery cell columns 25 form battery cell pairs 252. The two first battery cells 251 within the battery cell pair 252 are connected in series, and adjacent battery cell pairs 252 are connected in series, so that the starting point and the ending point of the current directions of the two columns of first battery cells 251 are located at opposite ends in the length direction of the battery pack (as Figure 11 shown). When the number of battery cell columns of the battery cell unit 20 is an odd number of columns, through the above solution, the two columns of first battery cell columns 25 can be made to be equivalent to a composite battery cell column, and then the composite battery cell column is combined with the remaining battery cell columns (such as Figure 9 the second battery cell column shown), to obtain a battery cell unit related to having an even number of columns. In other words, through the above solution, the battery cell columns with an odd number of columns in the battery cell unit can be constructed to be similar to the battery cell columns with an even number of columns. For the battery cell columns with an even number, by connecting multiple even battery cell columns in series, the positive and negative poles of the battery cell unit 20 can be located at the same end of the battery pack, thereby facilitating the arrangement of the battery pack electrodes and facilitating the electrical connection between the battery cell unit 20 and the high-voltage distribution box.

[0158] In the present disclosure, in the length direction of the battery pack, the positive electrodes of the two first battery cells 251 in each battery cell pair 252 are located on the same side. The positive electrode of one first battery cell 251 in each battery cell pair 252 is electrically connected to the negative electrode of the other first battery cell 251 through a first electrical connector 51, and the positive electrode of one of the adjacent two battery cell pairs 252 is electrically connected to the negative electrode of the other through a second electrical connection row 572. As Figure 10 shown, by locating the positive electrodes of the two first battery cells 251 in the battery cell pair 252 on the same side, the positive and negative poles of the battery cell pair 252 can be located at opposite ends in the length direction of the battery pack after the positive and negative poles of the two first battery cells 251 in the battery cell pair 252 are connected in series.

[0159] In the present disclosure, as Figure 9 shown, multiple battery cell columns in each battery cell unit 20 further include at least one column of second battery cell columns 26. The second battery cell columns 26 are arranged along the width direction of the battery pack, and at least one column of second battery cell columns 26 is connected in series with the first battery cell columns 25. The second battery cell columns 26 include multiple second battery cells 261 arranged along the length direction of the battery pack, and the multiple second battery cells 261 in the same second battery cell column 26 are connected in series. The second battery cell columns 26 include multiple second battery cells 261 arranged along the length direction of the battery pack. Since the positive and negative electrodes of the second battery cells 261 are respectively arranged along the length direction of the battery pack, the multiple second battery cells 261 in the same second battery cell column 26 are connected in series. The second battery cell columns 26 are connected in series with the first battery cell columns 25 to form a battery cell unit 20.

[0160] In the present disclosure, as Figure 8As shown, the battery pack further includes a plurality of third electrical connection rows 573, a plurality of fourth electrical connection rows 574, and a plurality of fifth electrical connection rows 575. Adjacent second battery cells 261 in the same second battery cell column 26 are connected in series through the third electrical connection row 573, 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.

[0161] Among them, as Figure 10 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 opposite ends of the second section 5712. The first section 5711 and the third section 5713 respectively extend in opposite directions along the length direction of the battery pack from opposite ends of the second section 5712. The first section 5711 is connected to the positive electrode of one of the first battery cells 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 battery cells 251 of the battery cell pair 252 are arranged along the width direction of the battery pack. The first electrical connection row 571 is used to connect the two first battery cells 251. The function of the second section 5712 is to connect the two first battery cells 251 in the width direction of the battery pack. The first section 5711 and the third section 5713 are connected to opposite ends of the second section 5712 and extend in opposite directions along the length direction of the battery pack, facilitating the connection of the positive and negative electrodes of the two first battery cells 251. Since the positive electrodes of the two first battery cells 251 are on the same side in the length direction of the battery pack, such a design facilitates the connection of the positive and negative electrodes of the two first battery cells 251 by the first electrical connection row 571. The extending direction of the second section 5712 may intersect with the length direction of the battery pack. In other words, the second section 5712 may be connected to the first section 5711 at an angle, and the second section 5712 may 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, nor the connection angle between the second section 5712 and the third section 5713, and it may be any appropriate angle.

[0162] For example, as Figure 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. The first electrical connection row 571 is configured in a form similar to a "Z" row. Since the two first battery cells 251 between the battery cell pairs 252 are arranged oppositely, the two first battery cells 251 are arranged in parallel. Setting the first electrical connection row 571 in a form similar to a "Z" row facilitates the connection of the first electrical connection row 571 to the two first battery cells 251 and can make the arrangement of the battery cell pairs 252 neat.

[0163] Among them, the specific structure of the second electrical connection row 572 is not limited. Optionally, in an embodiment of the present disclosure, as Figure 10 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 opposite ends of the fifth section 5722. The fourth section 5721 and the sixth section 5723 respectively extend in opposite directions in the length direction of the battery pack from opposite ends of the fifth section 5722. The fourth section 5721 is connected to the positive electrode of one of the adjacent two battery cell pairs 252, and the sixth section 5723 is connected to the negative electrode of the other of the adjacent two battery cell pairs 252. A plurality of battery cell pairs 252 are arranged in the length direction of the battery pack. The second electrical connection row 572 is used to connect two battery cell pairs 252. The function of the fifth section 5722 is to connect two battery cell pairs 252 in the length direction of the battery pack. The fourth section 5721 and the sixth section 5723 are connected to opposite ends of the fifth section 5722 and extend in opposite directions in the length direction of the battery pack. With such a setting, it is convenient for the second electrical connection row 572 to connect the positive and negative electrodes of two battery cell pairs 252.

[0164] In the present disclosure, as Figure 10 shown, the extending direction of the fifth section 5722 can intersect with the length direction of the battery pack. In other words, the fifth section 5722 is angularly connected to the fourth section 5721, and the fifth section 5722 is angularly connected to the sixth section 5723. The present disclosure does not limit the connection angle between the fifth section 5722 and the fourth section 5721, and the connection angle between the fifth section 5722 and the sixth section 5723, and it can be any appropriate angle.

[0165] For example, as Figure 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. 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. The second electrical connection row 572 is configured in a form similar to a "Z" row. Since the battery cell pairs 252 are arranged along the length direction of the battery pack, setting the second electrical connection row 572 in a form similar to a "Z" row facilitates the connection of the positive and negative electrodes of two battery cell pairs 252 and can make the first battery cell column 25 arranged neatly.

[0166] In the length direction of the battery pack, 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 less than the length of the first section 5711.

[0167] In the present disclosure, as Figure 8 shown, in order to facilitate the connection of two adjacent second battery cells 261, the third electrical connection row 573 can be configured 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.

[0168] In order to facilitate the connection of battery cell columns, the fourth electrical connection row 574 and the fifth electrical connection row 575 can be configured as strips extending along the width direction of the battery pack.

[0169] Among them, the fourth electrical connection row 574 and the fifth electrical connection row 575 can have the same structure or different structures. When the fourth electrical connection row 574 and the fifth electrical connection row 575 are configured with the same structure, it is convenient for unified processing. In the present disclosure, the number of battery cell units 20 is not limited, and it is at least one. As Figure 8 shown, the number of battery cell units can be two. In each battery cell unit 20, the number of the first battery cell columns 25 is two, and the number of columns of the second battery cell columns 26 is odd. Thus, as analyzed above, the positive and negative extreme ends of the battery cell unit 20 can be on the same side in the length direction of the battery pack.

[0170] Among them, as Figure 8 and Figure 9As shown, the first cell columns 25 appear in pairs. The first cells 251 between the two first cell columns 25 are connected in series, and have a positive electrode and a negative electrode located at opposite ends in the length direction of the battery pack. A single second cell column 26 also has a positive electrode and a negative electrode located at opposite ends in the length direction of the battery pack. Therefore, when the second cell column 26 is connected to the two first cell columns 25, positive and negative electrodes located at the same end can be obtained. Then, when the number of second cell columns 26 in the cell unit 20 is an odd number, the multiple second cell columns 26 are connected in series and then connected in series with the two first cell columns 25 having a positive electrode and a negative electrode located at opposite ends in the length direction of the battery pack, so that the positive and negative electrodes of the cell unit 20 can be located at the same end of the battery pack.

[0171] For example, the number of cell units 20 is set to two. When the number of columns of single-row cells in the battery pack is a multiple of 4, such as 20 columns or 24 columns, the ends of each column of cells are connected in series, so that the electrodes of multiple single cell units 20 are all at the same end.

[0172] For example, the number of cell units 20 is set to two. When the number of columns of single-row cells in a single cell unit 20 is not a multiple of 2 and the number of columns of single-row cells in the battery pack is not a multiple of 4, such as 26 columns (the number of columns of single-row cells in a single cell unit 20 is 13 columns), connecting the ends of each column of cells in series cannot make the electrodes of the cell unit 20 located at the same end of the battery pack. As Figure 11 and Figure 12 shown, the single-row cells of the two first cell columns 25 are cross-connected through the first electrical connector 51 and the second electrical connector 52. As Figure 11 and Figure 12 shown by the current arrows, it is equivalent to forming a composite single-row cell. Using this connection scheme, it is equivalent to changing the 13 columns of cells in a single cell unit 20 to 11 columns of cells plus 1 column of composite single-row cells, which is 12 columns of cells, making the total number of cell columns a multiple of 2. That is, changing the 26 columns of cells in two cell units 20 to 22 columns of cells plus 2 columns of composite single-row cells, which is 24 columns of cells, making the total number of cell columns a multiple of 4, and finally ensuring that the electrodes all belong to the same end of the battery pack;

[0173] In the present disclosure, as Figure 8 shown, the number of cell units 20 can be two. The two cell units 20 are arranged correspondingly and can be used alone or in series, and can be adapted to different voltage platforms. Selecting one of the two cell units to be used alone or using the two cell units in series simultaneously can enable the battery pack to be applicable to charging platforms with different charging voltages and can also perform discharging at different voltages.

[0174] 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.

[0175] According to a second aspect of the present disclosure, there is provided an electrical device, which includes a device body and a battery pack. The battery pack is installed on the device body and is used to supply power to the device body.

[0176] Here, the electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc. The electric toy includes fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc.; the electric tool includes metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools. The present disclosure does not limit this.

[0177] Optionally, when the electrical device is a vehicle, the battery pack of the present disclosure may be installed on the vehicle body to provide power for the driving of the vehicle.

[0178] Figure 7 The circuit schematic diagram of the battery pack connected to the high-voltage distribution box 30 is shown. Two battery cell units 20 are connected in series. An opening and closing device 10 and a fuse 40 for controlling the opening and closing of the series circuit are connected to the series circuit. The other end of the two battery cell units 20 connected in series is connected to the circuit of the high-voltage distribution box 30. A pre-charge circuit is provided in the high-voltage distribution box 30 to protect the relay.

[0179] When a single battery cell unit 20 works, F1 (fuse 40) is disconnected from F2 (disconnecting device 10) (or one of them is disconnected), ensuring that the series circuit between the battery cell units 20 is disconnected. The first battery cell unit 21 or the second battery cell unit 22 is separately connected to the high-voltage distribution box 30 and is adapted to the low-voltage charging system. When the two battery cell units 20 work in series, F1 works normally, F2 is closed, and the opposite ends of the series circuit of the first battery cell unit 21 and the second battery cell unit 22 are connected to the high-voltage distribution box 30, which is adapted to the high-voltage charging system.

[0180] It can be understood that Figure 7 This is a circuit schematic diagram provided by the present disclosure for implementing the above functions. The present disclosure does not limit other circuit diagrams or other circuit layout methods that can implement the above functions.

[0181] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0182] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combinations.

[0183] Furthermore, any combination can be made among the various different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A battery pack, characterized in that, It includes a battery pack box body, a switching device, and multiple battery cell units; The multiple battery cell units are arranged inside the battery pack box body; The positive electrode of each battery cell unit is adapted to be electrically connected to the positive extreme of the high-voltage distribution box, and the negative electrode of each battery cell unit is adapted to be electrically connected to the negative extreme of the high-voltage distribution box; Moreover, the multiple battery cell units are arranged in series on the series circuit of the battery pack in sequence, and both ends of the series circuit are respectively connected to the positive extreme and the negative extreme of the high-voltage distribution box; The switching device is arranged on the series circuit and is used to connect or disconnect the series circuit so as to connect the multiple battery cell units in series to the series circuit or disconnect the series connection between the multiple battery cell units.

2. The battery pack according to claim 1, wherein The battery pack further includes the high-voltage distribution box.

3. The battery pack according to claim 1, characterized in that, The battery pack further includes a fuse, and the fuse is arranged on the series circuit.

4. The battery pack according to claim 1, characterized in that, The switching device is a relay.

5. The battery pack according to claim 1, characterized in that, The battery pack further includes at least one insulating member, and the insulating member is arranged between adjacent battery cell units.

6. The battery pack according to claim 1, wherein The number of the battery cell units is an even number.

7. The battery pack according to claim 1, wherein Both the positive electrode and the negative electrode of the battery cell units in the multiple battery cell units are located on the same side of the battery pack.

8. The battery pack according to claim 7, characterized in that, The multiple battery cell units are arranged along the width direction of the battery pack, and each battery cell unit includes at least one battery cell group; The battery cells in each battery cell group extend and are arranged along the length direction of the battery pack; Both the positive electrode and the negative electrode of each battery cell unit are located on the same side in the length direction of the battery pack.

9. The battery pack according to claim 8, wherein, Each battery cell group includes multiple rows of battery cells arranged along the length direction of the battery pack, and each row of battery cells includes multiple battery cells arranged along the width direction of the battery pack; In the same battery cell group, the battery cells in each row of battery cells are connected in series, and the adjacent two rows of battery cells are connected in series.

10. The battery pack according to claim 7, wherein Each battery cell unit includes multiple battery cell columns, each battery cell column includes multiple battery cells arranged along the length direction of the battery pack, and the multiple battery cell columns are arranged along the width direction of the battery pack; The multiple battery cells in each battery cell column are connected in series, and the adjacent two battery cell columns are connected in series.

11. The battery pack according to any one of claims 1-7, characterized in that, The multiple battery cell units include a first battery cell unit and a second battery cell unit arranged adjacent to each other; The switching device is arranged on the circuit between the negative electrode of the first battery cell unit and the positive electrode of the second battery cell.

12. The battery pack according to claim 11, characterized in that, The first battery cell unit and the second battery cell unit are symmetrically arranged.

13. The battery pack according to claim 12, characterized in that, The first battery cell unit and the second battery cell unit are symmetrically arranged with respect to the midline in the width direction of the battery pack.

14. The battery pack according to claim 11, characterized in that, The battery pack further includes a first electrical connector and a second electrical connector; The first electrical connector is adapted to electrically connect the positive electrode of the first battery cell unit to the positive extreme of the high-voltage distribution box; The second electrical connector is adapted to electrically connect the negative electrode of the first battery cell unit to the negative extreme of the high-voltage distribution box.

15. The battery pack according to claim 14, characterized in that, The battery pack further includes a third electrical connection and a fourth electrical connector; The third electrical connector is adapted to electrically connect the positive electrode of the second battery cell unit to the positive extreme of the high-voltage distribution box; The fourth electrical connector is adapted to electrically connect the negative electrode of the second battery cell unit to the negative extreme of the high-voltage distribution box; The switching device is arranged on the circuit between the second electrical connector and the third electrical connector.

16. The battery pack according to claim 15, wherein A fuse is also provided on the circuit between the second electrical connector and the third electrical connector, and the fuse is connected in series with the opening and closing device.

17. The battery pack according to claim 16, characterized in that, The first battery cell unit and the second battery cell unit are arranged along the width direction of the battery pack; The first electrical connector, the second electrical connector, the third electrical connector and the fourth electrical connector are located on the same side in the length direction of the battery pack; In the width direction of the battery pack, the first electrical connector and the fourth electrical connector are the two outermost electrical connectors.

18. The battery pack according to claim 17, characterized in that, In the width direction of the battery pack, the first electrical connector and the fourth electrical connector are symmetrically arranged with respect to the midline in the width direction of the battery pack; and / or, the second electrical connector and the third electrical connector are symmetrically arranged with respect to the midline in the width direction of the battery pack.

19. The battery pack according to claim 17, wherein, The first electrical connector has a first extension section, and the fourth electrical connector has a second extension section; The first extension section and the second extension section extend towards each other along the width direction of the battery pack; The first extension section is adapted to be electrically connected to the positive extreme of the high-voltage distribution box, and the second extension section is adapted to be electrically connected to the negative extreme of the high-voltage distribution box.

20. The battery pack according to claim 17, wherein, The second electrical connector has a first connection section, and the third electrical connector has a second connection section; The first connection section and the second connection section extend towards each other along the width direction of the battery pack. The first connection section is connected to one of the opening and closing device and the fuse, and the second connection section is connected to the other of the opening and closing device and the fuse.

21. The battery pack according to claim 17, wherein, The first battery cell unit includes two battery cell groups arranged in series along the width direction of the battery pack; the first electrical connector is connected to the positive electrode of the battery cell group located on the outer side in the width direction in the first battery cell unit; The second electrical connector is connected to the negative electrode of the battery cell group located on the inner side in the width direction in the first battery cell unit; The second battery cell unit includes two battery cell groups arranged in series along the width direction of the battery pack; The third electrical connector is connected to the positive electrode of the battery cell group located on the inner side in the width direction in the second battery cell unit; The fourth electrical connector is connected to the negative electrode of the battery cell group located on the outer side in the width direction in the second battery cell unit.

22. The battery pack according to claim 21, wherein The battery pack further includes a plurality of jumper connectors and a plurality of adapter connectors; The four battery cell groups include multiple rows of battery cells arranged along the length direction of the battery pack, and each row of battery cells includes multiple battery cells arranged along the width direction of the battery pack; Each battery cell extends along the length direction of the battery pack, and the positive electrode and the negative electrode of the battery cell are arranged at both ends of the battery cell along the length direction of the battery pack. Adjacent battery cells in the same row are connected in series through the jumper connector, and adjacent battery cells in two adjacent rows are connected in series through the adapter connector.

23. The battery pack according to claim 22, wherein, The adapter connector includes an adapter straight row and an adapter bent row; The adapter straight row connects two battery cells with their narrow faces opposite to each other in the width direction of the battery in two adjacent rows of battery cells; The adapter bent row connects two battery cells with their narrow faces offset in the width direction of the battery pack in two adjacent rows of battery cells.

24. The battery pack according to claim 17, wherein The second electrical connector and the third electrical connector are located in the middle of the width direction of the battery pack.

25. The battery pack according to claim 17, wherein, The first battery cell unit and the second battery cell unit both include a plurality of battery cell columns, each battery cell column includes a plurality of battery cells arranged along the length direction of the battery pack, and the plurality of battery cell columns are arranged along the width direction of the battery pack; The plurality of battery cells in each battery cell column are connected in series, and adjacent two battery cell columns are connected in series.

26. The battery pack according to claim 25, wherein, The first electrical connection member is connected to the battery cell column located on the outermost side in the width direction of the battery pack in the first battery cell unit; The second electrical connection member is connected to the battery cell column located on the innermost side in the width direction of the battery pack in the first battery cell unit; The third electrical connection member is connected to the battery cell column located on the innermost side in the width direction of the battery pack in the second battery cell unit; The fourth electrical connection member is connected to the battery cell column located on the outermost side in the width direction of the battery pack in the second battery cell unit.

27. The battery pack according to any one of claims 1-7, characterized in that, The plurality of battery cell columns in each battery cell unit includes at least two first battery cell columns, and each first battery cell column includes a plurality of first battery cells arranged along the length direction of the battery pack; In the length direction of the battery pack, the plurality of first battery cells in one of the first battery cell columns are arranged corresponding to the plurality of first battery cells in another adjacent first battery cell column, and a plurality of battery cell pairs are constructed, and each battery cell pair includes two first battery cells located in different first battery cell columns; The battery pack further includes a first electrical connection row and a second electrical connection row; The two first battery cells in each battery cell pair are connected in series through the first electrical connection row, and adjacent two battery cell pairs are adapted to be connected in series through the second electrical connection row.

28. The battery pack according to claim 27, wherein, In the length direction of the battery pack, the positive electrodes of the two first battery cells in each battery cell pair are located on the same side; The positive electrode of one first battery cell in each battery cell pair is electrically connected to the negative electrode of another first battery cell through the first electrical connection member, and the positive electrode of one of the adjacent two battery cell pairs is electrically connected to the negative electrode of the other through the second electrical connection row.

29. The battery pack according to claim 27, characterized in that, The plurality of battery cell columns in each battery cell unit further includes at least one second battery cell column; The second battery cell column and the first battery cell column are arranged along the width direction of the battery pack, and the at least one second battery cell column is connected in series with the first battery cell column; The second battery cell column includes a plurality of second battery cells arranged along the length direction of the battery pack; The plurality of second battery cells in the same second battery cell column are connected in series.

30. The battery pack according to claim 29, wherein, The battery pack further includes a plurality of third electrical connection rows, a plurality of fourth electrical connection rows and a plurality of fifth electrical connection rows; Adjacent two of the second battery cells in the same second battery cell column are connected in series through the third electrical connection row; Adjacent two second battery cell columns are connected in series through the fourth electrical connection row; The first battery cell column and the adjacent second battery cell column are connected in series through the fifth electrical connection row.

31. An electrical device, characterized in that, Including an equipment main body and the battery pack according to any one of claims 1-30, the battery pack is installed on the equipment main body and is used to supply power to the equipment main body.

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