Battery pack

Abstract

The utility model provides a battery pack, which relates to the technical field of battery related equipment, and comprises at least one battery pack, and the battery pack comprises a first-layer battery monomer group and a second-layer battery monomer group which are sequentially arranged along a first direction; the first-layer battery monomer group comprises first battery monomers which are sequentially arranged along a second direction, the second-layer battery monomer group comprises second battery monomers which are sequentially arranged along the second direction, and each of the first battery monomers and the second battery monomers is provided with a first side wall and a second side wall which is arranged away from the first side wall in the first direction; the first side wall of the first battery monomer and the second side wall of the second battery monomer which are adjacently arranged are oppositely arranged along the first direction and are staggered in the second direction. The battery monomers are arranged in a staggered manner, so that the arrangement space of the battery monomers can be fully utilized, the arrangement modes of the battery monomers are diversified, and the adaptability is better.

Description

Technical Field

[0001] The utility model relates to the technical field of battery-related equipment, in particular to a battery pack. Background Art

[0002] With the rapid development of new energy technology, lithium battery technology has also developed rapidly.

[0003] In the prior art, a battery includes a housing, a battery cell disposed in the housing, and a positive electrode column and a negative electrode column disposed on the housing. The positive electrode ear of the battery cell is connected to the positive electrode column, and the negative electrode ear of the battery cell is connected to the negative electrode column. In a battery pack, multiple battery cells are usually arranged in multiple rows and columns, and adjacent battery rows or adjacent battery columns are aligned and arranged, respectively, which places certain regularity requirements on the battery arrangement space. Utility Model Content

[0004] The purpose of the utility model is to provide a battery pack to alleviate the technical problem of the single arrangement of battery cells in the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] In a first aspect, the utility model provides a battery pack, comprising at least one battery pack, each of which comprises a first layer of battery cell groups and a second layer of battery cell groups sequentially arranged along a first direction;

[0007] The first layer of battery cell groups includes a plurality of first battery cells arranged in sequence along a second direction, the second layer of battery cell groups includes a plurality of second battery cells arranged in sequence along the second direction, the first battery cells and the second battery cells each have a first side wall and a second side wall arranged away from the first side wall in the first direction, the first side walls of the adjacent first battery cells and the second side walls of the adjacent second battery cells are arranged facing each other in the first direction and staggered in the second direction, and the adjacent first battery cells and the second battery cells are electrically connected; wherein, the first direction is perpendicular to the first side wall; and the second direction and the first direction are perpendicular to each other.

[0008] Furthermore, the first battery cell and the second battery cell are both unit batteries, and the unit batteries include:

[0009] A housing, the housing having a containing cavity and a first side wall and a second side wall which are perpendicular to the first direction and opposite to each other;

[0010] A pole, wherein two ends of the pole along a first direction respectively penetrate the first side wall and the second side wall of the shell, and both ends of the pole along the first direction are connected to the shell through an insulating seal.

[0011] Furthermore, a recessed portion and a raised portion are respectively provided at both ends of the pole of the unit battery along the first direction; the raised portion of the adjacent first battery cell and the recessed portion of the second battery cell are plugged together in series, or the recessed portion of the adjacent first battery cell and the raised portion of the second battery cell are plugged together in series.

[0012] Further, the unit battery also includes a battery cell, which is arranged in the accommodating cavity, and the battery cell includes a battery cell body, and two pole ears with opposite polarities are arranged on one side of the third direction of the battery cell body, and the two pole ears are arranged at intervals along the second direction; the number of the pole ears and the pole columns are equal and the positions correspond one to one, and the pole columns are connected to the pole ears of the battery cell with the same polarity, wherein the first direction is perpendicular to the side surface with the largest area in the battery cell, and the third direction and the second direction are perpendicular to each other.

[0013] Furthermore, the pole is directly welded to a pole lug with the same polarity as the pole.

[0014] Further, the pole includes a first conductive member and a second conductive member, the first conductive member has a pole lug connecting portion located in the accommodating cavity, the pole lug connecting portion has a pole lug connecting surface perpendicular to the first direction; the pole lug connecting surface of the pole lug connecting portion is provided with a slot; the second conductive member has a plug-in portion located in the accommodating cavity, the first conductive member and the second conductive member are connected by plugging and fitting the plug-in portion and the slot; the pole lug connecting surface of the pole lug connecting portion is connected to the pole lug with the same polarity.

[0015] Furthermore, the battery pack also includes a first cooling plate, and the first layer of battery cell groups is arranged on the first cooling plate.

[0016] Furthermore, the battery pack also includes a second cooling plate, the battery group is located between the first cooling plate and the second cooling plate, and the second cooling plate is arranged on the second layer of battery monomer group.

[0017] Furthermore, the first battery cell and the second battery cell each have a third side wall perpendicular to the third direction, and the third side wall of the first battery cell and the third side wall of the second battery cell are both provided with explosion-proof valves; an exhaust duct is provided on one side of the third direction of the battery pack; a plurality of vents are provided on a side of the exhaust duct facing the explosion-proof valve, wherein the number of the vents on the same side of the exhaust duct and the explosion-proof valve in the same battery pack are equal and their positions correspond one to one.

[0018] Furthermore, the battery pack also includes a third cooling plate, and the battery groups are provided with two groups, the third side walls of the first battery cells in the two groups of the battery groups are arranged back to back along the third direction, and the third side walls of the second battery cells in the two groups of the battery groups are arranged back to back along the third direction; the third cooling plate is located between the two groups of the battery groups, and the two groups of the battery groups are located between the two exhaust ducts.

[0019] The utility model can achieve the following beneficial effects:

[0020] In the utility model, the battery pack includes a first layer of battery cell groups and a second layer of battery cell groups connected to the first layer of battery cell groups; and the first layer of battery cell groups includes first battery cells arranged in sequence along the second direction, and the second layer of battery cell groups includes second battery cells arranged in sequence along the second direction; the first layer of battery cell groups is arranged below the second layer of battery cell groups along the first direction, the first direction is perpendicular to the second direction, and the battery cells located in the first layer are connected in series with the adjacent battery cells located in the second layer.

[0021] Compared with the prior art, the battery pack provided by the present invention arranges the battery cells in a staggered manner, which is conducive to fully utilizing the arrangement space of the battery cells and makes the arrangement of the battery cells diverse and more adaptable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the three-dimensional structure of a battery cell of a battery pack provided by an embodiment of the utility model;

[0024] Figure 2 A schematic diagram of the three-dimensional structure of a battery cell of a battery pack provided by an embodiment of the utility model;

[0025] Figure 3 A three-dimensional schematic diagram of the internal structure of a battery pack provided by an embodiment of the utility model;

[0026] Figure 4 An exploded schematic diagram of a local structure of a battery pack provided in an embodiment of the utility model;

[0027] Figure 5 A schematic diagram of the exploded structure of a battery pack provided in an embodiment of the utility model.

[0028] Icons: 1-unit battery; 11-housing; 111-first side wall; 112-second side wall; 12-pole; 121-first conductive member; 1211-ear connection surface; 122-second conductive member; 13-explosion-proof valve; 14-insulating seal; 15-battery cell; 151-battery cell body; 152-ear; 2-battery pack; 21-first layer of battery cell group; 22-second layer of battery cell group; 31-first cooling plate; 311-protrusion; 32-second cooling plate; 4-third cooling plate; 5-side plate; 51-exhaust flue; 6-battery management system (BMS); 7-battery pack disconnecting unit (BDU). DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present utility model, it should be noted that the terms "upper", "lower", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0036] Embodiment 1

[0037] This embodiment provides a battery pack, referring to Figure 3 The battery pack includes at least one battery group 2, each battery group 2 includes a first layer of battery monomer groups 21 and a second layer of battery monomer groups 22 arranged in sequence along a first direction; the first layer of battery monomer groups 21 includes a plurality of first battery monomers arranged in sequence along a second direction, the second layer of battery monomer groups 22 includes a plurality of second battery monomers arranged in sequence along the second direction, the first battery monomers and the second battery monomers both have a first side wall 111 and a second side wall 112 arranged away from the first side wall 111 in the first direction, the first side walls 111 and the second side walls 112 of the adjacent first battery monomers are arranged facing each other in the first direction and staggered in the second direction; the adjacent first battery monomers and the second battery monomers are connected in series, wherein the first direction is perpendicular to the first side wall 111; the second direction and the first direction are perpendicular to each other.

[0038] In the embodiment of the utility model, since the first side wall 111 of the first battery cell and the second side wall 112 of the second battery cell arranged adjacent to each other are arranged toward each other along the first direction and staggered in the second direction, the first layer of battery cell groups 21 and the second layer of battery cell groups 22 are staggered, which is conducive to fully utilizing the arrangement space of the battery cells and making the arrangement of the battery cells diverse and more adaptable.

[0039] It should be noted that in the embodiment of the utility model, only the battery cells are limited to be staggered, and the pole setting position is not described. In other words, as long as the adjacent and staggered first battery cells and the second battery cells can be electrically connected, it will be sufficient. For example, the positive and negative poles of the first battery cells and the second battery cells are both arranged on the side walls perpendicular to the third direction, so that after the adjacent first battery cells and the second battery cells are staggered, they can be electrically connected through the busbar.

[0040] In an optional implementation manner of this embodiment, refer to Figure 1 or Figure 2 The first battery cell and the second battery cell are both unit cells 1, and the unit cell 1 includes:

[0041] The housing 11 has a receiving cavity and a first side wall 111 and a second side wall 112 which are perpendicular to and opposite to the first direction;

[0042] The pole 12 has two ends along the first direction that penetrate the first side wall 111 and the second side wall 112 of the housing 11 respectively, and both ends of the pole 12 along the first direction are connected to the housing 11 through the insulating seal 14 .

[0043] In this embodiment, since the pole 12 passes through the first side wall 111 and the second side wall 112 of the outer shell 11, when the first side wall 111 of the adjacent first battery cell and the second side wall 112 of the second battery cell are arranged opposite to each other in the first direction and staggered in the second direction, part of the pole 12 on the first side wall 111 of the first battery cell and part of the pole 12 on the second side wall 112 of the second battery cell can be electrically connected, saving the busbar between the two battery cells and improving the production efficiency.

[0044] It should be noted that, for the convenience of manufacturing, the housing 11 is a split structure, that is, the housing is assembled from multiple parts, wherein the number of components required to assemble the housing is not limited. For example, the housing 11 includes a first part and a second part, the first part and the second part are connected, and the first part and the second part surround a receiving cavity; the first part of the housing is provided with a first through hole, the second part of the housing is provided with a second through hole, one end of the pole 12 in the first direction is connected to the first through hole through an insulating seal 14; the other end of the pole 12 in the first direction is connected to the second through hole through an insulating seal 14.

[0045] Further, refer to Figure 2In order to make the electrical connection between the adjacent first battery cells and the second battery cells more secure and reliable, the pole 12 of the unit battery 1 is provided with a recessed portion and a raised portion at both ends along the first direction respectively; the raised portion of the adjacent first battery cells and the recessed portion of the second battery cells are plugged together in series, or the recessed portion of the adjacent first battery cells and the raised portion of the second battery cells are plugged together in series.

[0046] In this embodiment, since the pole 12 has a recessed portion and a raised portion, the adjacent first battery cell and the second battery cell can be electrically connected by plugging in a manner that the raised portion is inserted into the recessed portion, which is quick to connect.

[0047] Furthermore, in order to make the battery cell more convenient to manufacture, the pole is designed to be a split structure, that is, Figure 2 The pole 12 includes a first conductive member 121 and a second conductive member 122, the first conductive member 121 has a pole ear connection portion located in the accommodating cavity, and the pole ear connection portion has a pole ear connection surface 1211 perpendicular to the first direction; the pole ear connection surface 1211 of the pole ear connection portion is provided with a slot; the second conductive member 122 has a plug-in portion located in the accommodating cavity, and the first conductive member 121 and the second conductive member 122 are connected by plug-in matching of the plug-in portion and the slot; the pole ear connection surface 1211 of the pole ear connection portion is attached and connected to the pole ear 152 with the same polarity.

[0048] In this embodiment, the first conductive member 121 is arranged in the first part of the shell, and the second conductive member 122 is arranged in the second part of the shell. When the first conductive member 121 and the second conductive member 122 are connected by plugging and fitting through the slot and the plug-in part, the first part of the shell and the second part of the shell are covered, which simplifies the assembly process and improves production efficiency.

[0049] It should be noted that in order to ensure that the slot and the plug-in part are securely plugged in, the slot and the plug-in part can be connected by laser welding. Specifically, during laser welding, the laser can penetrate the bottom of the slot.

[0050] In an optional implementation manner of this embodiment, refer to Figure 2 The unit battery 1 also includes a battery cell 15, which is arranged in the accommodating cavity. The battery cell 15 includes a battery cell body 151, and two pole ears 152 with opposite polarities are arranged on one side of the third direction of the battery cell body 151. The two pole ears 152 are arranged at intervals along the second direction. The number of pole ears 152 and the pole column 12 are equal and the positions correspond one to one. The pole column 12 is connected to the pole ear 152 of the battery cell 15 with the same polarity, wherein the first direction is perpendicular to the side surface with the largest area in the battery cell 15, and the third direction and the second direction are perpendicular to each other.

[0051] In this embodiment, since the first direction is perpendicular to the side surface with the largest area in the battery cell 15 and the two pole ears 152 are located on the same side of the battery cell 15, the battery cell can be arranged flat. Since the first layer of battery cell groups 21 and the second layer of battery cell groups 22 are arranged in sequence along the first direction, the overall height of the battery pack is reduced, thereby realizing the installation of the battery pack on the chassis of the vehicle.

[0052] Furthermore, in order to omit the adapter, speed up the battery production efficiency, and reduce the battery production cost, in the optional implementation of this embodiment, refer to Figure 1 or Figure 2 The pole 12 and the pole ear 152 with the same polarity are directly welded, for example, by laser welding.

[0053] In an optional implementation manner of this embodiment, refer to Figure 3 or Figure 4 The battery pack further includes a first cooling plate 31 , and the first layer of battery cell groups 21 are disposed on the first cooling plate 31 .

[0054] In this embodiment, the first cooling plate 31 contacts the second side wall 112 of the first battery cell to cool it down; in addition, since the second side wall 112 has the largest area among the outer walls of the first battery cell, a large area of ​​the first battery cell can be cooled, and the cooling effect is good. Preferably, the first cooling plate 31 can be a water-cooled plate.

[0055] It should be noted that the first cooling plate 31 is provided with a protrusion 311, and the protrusion 311 is used to be inserted into the recessed portion of the first battery cell, and is used to position and fix the first battery cell while better cooling the pole 12.

[0056] Further, refer to Figure 4 or Figure 5 The battery pack also includes a second cooling plate 32 , the battery group 2 is located between the first cooling plate 31 and the second cooling plate 32 , and the second cooling plate 32 is arranged on the second layer of the battery cell group 22 .

[0057] In this embodiment, the second cooling plate 32 contacts the first side wall 111 of the second battery cell to cool it down; in addition, since the first side wall 111 is the largest in area among the outer walls of the second battery cell, a large area of ​​the second battery cell can be cooled, and the cooling effect is good. Preferably, the second cooling plate 32 can be a water-cooled plate.

[0058] It should be noted that the second cooling plate 32 is provided with an inner groove, and the inner groove is plugged into the protrusion of the second battery cell to better cool the pole 12 .

[0059] In an optional implementation manner of this embodiment, refer to Figure 1 and Figure 4 The first battery cell and the second battery cell both have a third side wall perpendicular to the third direction, and the third side wall of the first battery cell and the third side wall of the second battery cell are both provided with an explosion-proof valve 13; an exhaust duct 51 is provided on one side of the third direction of the battery pack 2; a side of the exhaust duct 51 facing the explosion-proof valve 13 is provided with a plurality of vents, wherein the number of the vents on the same side of the exhaust duct 51 and the explosion-proof valve 13 in the same battery pack 2 are equal and their positions correspond one to one.

[0060] Specifically, the first battery cell and the second battery cell both have a third side wall perpendicular to the third direction, and a side plate 5 is provided on the outside of the third side wall, and an exhaust flue 51 is provided on the side plate 5 in the horizontal direction; and the number of vents on the same side of the exhaust flue 51 and the explosion-proof valve 13 in the same battery pack 2 are equal and the positions correspond one to one. When in use, the exhaust flue 51 is used to discharge the flue gas when the battery pack 2 has thermal runaway.

[0061] Further, refer to Figure 3 or Figure 5 The battery pack also includes a third cooling plate 4. The battery pack 2 is provided with two groups. The third side walls of the first battery cells in the two battery packs 2 are arranged opposite to each other along the third direction, and the third side walls of the second battery cells in the two battery packs 2 are arranged opposite to each other along the third direction; the third cooling plate 4 is located between the two battery packs 2, and the two battery packs 2 are located between the two exhaust ducts 51.

[0062] Specifically: there are two battery groups 2, the third side walls of the first battery cells in the two battery groups 2 are arranged back to back along the third direction, and the third side walls of the second battery cells in the two battery groups 2 are arranged back to back along the third direction, and adjacent battery groups 2 are separated by a third cooling plate 4, that is, the side of the battery group 2 is cooled by the third cooling plate 4, and preferably, the third cooling plate 4 can be a water cooling plate.

[0063] It should be noted that, refer to Figure 5 The battery pack also includes a heat-insulating pad, which is located between the first layer of battery monomer group 21 and the second layer of battery monomer group 22, and is provided with holes that fit with the protrusions.

[0064] The battery pack also includes a battery management system (BMS) 6 and a battery pack disconnecting unit (BDU) 7. The number of first battery cells in the first-layer battery cell group 21 is greater than the number of second battery cells in the second-layer battery cell group 22, and the adjacent first battery cells and second battery cells are staggered. Therefore, accommodating space is reserved on both sides of the second direction of the first-layer battery cell group 21. The battery management system (BMS) 6 and the battery pack disconnecting unit (BDU) 7 are respectively arranged in the two accommodating spaces, and the space utilization rate is high.

[0065] Among them, the battery management system (BMS) 6 is an electronic system for managing and controlling the lithium battery pack, and the battery management system (BMS) 6 includes a BMS main board, a BMS slave board, a BMS main board bracket, a BMS assembly bracket, etc. The battery pack disconnect unit (BDU) 7 includes a PCB board and a BDU housing, etc.

[0066] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referenced to each other; the above embodiments in this specification are only used to illustrate the technical solution of the utility model, rather than to limit it; although the utility model is described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that: it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A battery pack, characterized in that: Comprising at least one group of battery groups (2), each of the battery groups (2) comprising a first layer of battery monomer groups (21) and a second layer of battery monomer groups (22) arranged in sequence along a first direction; The first layer of battery cell groups (21) comprises a plurality of first battery cells arranged in sequence along a second direction, the second layer of battery cell groups (22) comprises a plurality of second battery cells arranged in sequence along the second direction, the first battery cells and the second battery cells both have a first side wall (111) and a second side wall (112) arranged opposite to each other along the first direction, the first side wall (111) of the adjacent first battery cells and the second side wall (112) of the adjacent second battery cells are arranged opposite to each other along the first direction and staggered in the second direction, and the adjacent first battery cells and the second battery cells are electrically connected; wherein the first direction is perpendicular to the first side wall (111); and the second direction and the first direction are perpendicular to each other.

2. The battery pack according to claim 1, characterized in that: The first battery cell and the second battery cell are both unit batteries (1), and the unit batteries (1) include: A housing (11), the housing (11) comprising a receiving cavity and a first side wall (111) and a second side wall (112) which are perpendicular to the first direction and arranged opposite to each other; A pole (12), wherein two ends of the pole (12) along a first direction respectively penetrate a first side wall (111) and a second side wall (112) of the housing (11), and both ends of the pole (12) along the first direction are connected to the housing (11) via an insulating seal (14).

3. The battery pack according to claim 2, characterized in that: The pole (12) of the unit battery (1) is provided with a recessed portion and a raised portion at both ends along the first direction respectively; the raised portion of the adjacent first battery cell and the recessed portion of the adjacent second battery cell are plugged together and connected in series, or the recessed portion of the adjacent first battery cell and the raised portion of the adjacent second battery cell are plugged together and connected in series.

4. The battery pack according to claim 2, characterized in that: The unit battery (1) also includes a battery cell (15), wherein the battery cell (15) is arranged in the accommodating cavity, and the battery cell (15) includes a battery cell body (151), and two pole ears (152) with opposite polarities are arranged on one side of the battery cell body (151) in the third direction, and the two pole ears (152) are arranged at intervals along the second direction; the number of the pole ears (152) and the pole column (12) are equal and the positions correspond one to one, and the pole column (12) is connected to the pole ear (152) of the battery cell (15) with the same polarity, wherein the first direction is perpendicular to a side surface with the largest area in the battery cell (15), and the third direction and the second direction are perpendicular to each other.

5. The battery pack according to claim 4, characterized in that: The pole (12) and the pole lug (152) with the same polarity are directly welded.

6. The battery pack according to claim 5, characterized in that: The pole (12) comprises a first conductive member (121) and a second conductive member (122), wherein the first conductive member (121) has a pole lug connection portion located in a receiving cavity, and the pole lug connection portion has a pole lug connection surface (1211) perpendicular to the first direction; the pole lug connection surface (1211) of the pole lug connection portion is provided with a slot; the second conductive member (122) has a plug-in portion located in the receiving cavity, and the first conductive member (121) and the second conductive member (122) are connected by plugging and matching the plug-in portion and the slot; the pole lug connection surface of the pole lug connection portion is connected to the pole lug (152) having the same polarity as the pole lug.

7. The battery pack according to any one of claims 1 to 6, characterized in that: It also includes a first cooling plate (31), on which the first layer of battery cell groups (21) are arranged.

8. The battery pack according to claim 7, characterized in that: It also includes a second cooling plate (32), the battery group (2) is located between the first cooling plate (31) and the second cooling plate (32), and the second cooling plate (32) is arranged on the second layer of battery monomer group (22).

9. The battery pack according to claim 7, characterized in that: The first battery cell and the second battery cell both have a third side wall which is perpendicular to the third direction, and the third side wall of the first battery cell and the third side wall of the second battery cell are both provided with an explosion-proof valve (13); an exhaust duct (51) is provided on one side of the third direction of the battery pack (2); a plurality of vents are provided on a side of the exhaust duct (51) facing the explosion-proof valve (13), wherein the number of the vents on the same side of the exhaust duct (51) and the explosion-proof valve (13) in the same battery pack (2) are equal and their positions correspond one to one.

10. The battery pack according to claim 9, characterized in that: It also includes a third cooling plate (4), the battery group (2) is provided with two groups, the third side walls of the first battery cells in the two groups of the battery groups (2) are arranged opposite to each other along the third direction, and the third side walls of the second battery cells in the two groups of the battery groups (2) are arranged opposite to each other along the third direction; the third cooling plate (4) is located between the two groups of the battery groups (2), and the two groups of the battery groups (2) are located between the two exhaust ducts (51).

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