Battery cell and battery pack with same

Abstract

The utility model discloses a single battery and a battery pack with the single battery, and the single battery comprises a shell with an accommodating cavity; the multiple pole groups extend in the first direction, the multiple pole groups are arranged at intervals in the first direction and electrically connected, the pole groups are arranged in the containing cavity, and the multiple pole groups are suitable for being assembled into the containing cavity in the first direction; the number of the first supporting plates is multiple, the first supporting plates are arranged on the two end faces, oppositely arranged in the first direction, of every two adjacent pole groups respectively, and the end faces are fixedly connected with the first supporting plates. According to the single battery disclosed by the utility model, when the length of the single battery is relatively long, the pole group of the single battery can still keep a stable and reliable structural state during assembly, so that the risk of damage caused by the problems of deformation, breakage and the like of the pole group is greatly reduced, and the assembly and processing yield of the single battery is relatively high.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cell and a battery pack having the same. Background Art

[0002] At present, in order to save the structure of battery cells and improve the space utilization rate, the battery cells have a large-size structural design, and the length of the battery cells is relatively long, so as to reduce the arrangement number of battery cells in the battery pack, thereby reducing the space occupied by structures such as the housing in the battery cells, improving the energy density of the battery pack and reducing the cost. However, when the length of the battery cell is relatively long, the length of the electrode group in the battery cell is correspondingly set to be very long. Due to the strength problem of the electrode group, the electrode group often bends and deforms. For example, when the long electrode group is assembled into the housing of the battery cell during the assembly production of the battery cell, the electrode group is prone to wrinkles, deformation, layer displacement, fracture and other defects, resulting in a decrease in the yield of battery cell production. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a battery cell, which can stably and reliably assemble the electrode group into the housing during assembly, so that the electrode group can maintain a stable and reliable structural state, thereby enabling the battery cell to have a better yield during production and processing.

[0004] The utility model also provides a battery pack having the above battery cell.

[0005] The battery cell according to the first aspect of the utility model includes: a housing having a receiving cavity; an electrode group extending in a first direction, the number of the electrode groups being multiple, the multiple electrode groups being arranged at intervals along the first direction and electrically connected, the electrode groups being disposed in the receiving cavity, and the multiple electrode groups being adapted to be assembled into the receiving cavity along the first direction; a first support plate, the number of the first support plates being multiple, and the first support plates being respectively provided on two end faces of two adjacent electrode groups arranged opposite to each other in the first direction, and the end faces being fixedly connected to the first support plates.

[0006] According to the battery cell of the utility model, by providing multiple electrode groups, the multiple electrode groups extend along the first direction and are arranged at intervals along the first direction, the multiple electrode groups are electrically connected, and the first support plates are respectively fixed on two end faces of two adjacent electrode groups arranged opposite to each other in the first direction. When the length dimension of the battery cell is relatively long, the electrode groups of the battery cell can still maintain a stable and reliable structural state during assembly, greatly reducing the risk of damage caused by problems such as deformation and fracture of the electrode groups, and making the yield of battery cell assembly and processing higher.

[0007] In some embodiments of the utility model, the number of the pole groups is two, and the two pole groups are respectively formed as a first pole group and a second pole group, in the first direction, a first pole ear is provided at one end of the first pole group facing the second pole group, and a second pole ear is provided at one end of the second pole group facing the first pole group, and the first support plate is provided with an avoidance hole, the first pole ear and the second pole ear have opposite polarities and pass through the avoidance holes respectively, and the first pole ear is electrically connected to the second pole ear.

[0008] In one embodiment of the utility model, the battery cell further includes a second support plate, and in the first direction, the second support plate is fixedly connected to an end of the first pole group that is away from the second pole group, and / or the second support plate is fixedly connected to an end of the second pole group that is away from the first pole group.

[0009] In one embodiment of the utility model, the battery cell also includes a support assembly, and the support assembly is arranged between the first pole group and the second pole group. In the first direction, two sides of the support assembly are respectively abutted against the first support plate, and the support assembly forms an avoidance channel, and the first pole ear and the second pole ear are inserted into the avoidance channel.

[0010] In some examples of the present invention, the support assembly includes: a first support member and a second support member, the first support member and the second support member are arranged along a second direction and are snap-connected, the first support member includes a first plate portion, the second support member includes a second plate portion, the first plate portion and the second plate portion both extend along the second direction, wherein the projections of the first plate portion and the second plate portion on a projection plane perpendicular to the first direction partially overlap, and in the first direction, the first plate portion and the second plate portion have a gap to cooperate in defining the avoidance channel, and the second direction intersects with the first direction.

[0011] In one example of the utility model, the first support member also includes a first clamping portion, which is provided at both ends of the first plate portion in the third direction, and the second support member also includes a second clamping portion, which is provided at both ends of the second plate portion in the third direction, the first clamping portion is clamped and connected with the second clamping portion, and the third direction intersects with the second direction and the first direction in pairs.

[0012] In some embodiments of the present utility model, openings are provided at both ends of the housing in the first direction, and the openings communicate with the accommodating cavity. The battery cell further includes a cover plate assembly, and the number of the cover plate assemblies is two and they respectively seal the two openings. Among them, the cover plate assembly is provided with a first explosion-proof valve, and the housing is provided with a second explosion-proof valve. In the third direction, the second explosion-proof valve is arranged between two adjacent pole groups.

[0013] In some embodiments of the present utility model, the thickness of the first support plate is greater than 0.3 mm and less than 2 mm.

[0014] In some embodiments of the present utility model, the battery cell further includes: an insulating film sleeved on the outer peripheral sides of the plurality of pole groups and arranged between the plurality of pole groups and the inner wall of the accommodating cavity; a side plate extending along the first direction and arranged between the insulating film and the inner wall of the accommodating cavity, and the side plate is located on one side of the pole group in the third direction.

[0015] The battery pack according to the second aspect of the present utility model includes the battery cell according to the first aspect of the present utility model.

[0016] In the battery pack according to the present utility model, by providing the battery cell of the above first aspect, and by providing a plurality of pole groups that extend along the first direction and are arranged at intervals in the first direction, and the plurality of pole groups are electrically connected, and first support plates are respectively fixed on the two end faces of two adjacent pole groups that are opposite to each other in the first direction. When the length dimension of the battery cell is relatively long, the pole groups of the battery cell can still maintain a stable and reliable structural state during assembly, greatly reducing the risk of damage caused by problems such as deformation and fracture of the pole groups, and making the yield rate of the battery cell assembly processing higher.

[0017] Additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a battery cell according to an embodiment of the present utility model;

[0019] Figure 2 is an exploded view of a battery cell according to an embodiment of the present utility model;

[0020] Figure 3 is a schematic diagram of the battery cell from another angle according to an embodiment of the present utility model;

[0021] Figure 4 is an exploded view of the battery cell from another angle according to an embodiment of the present utility model;

[0022] Figure 5 It is a schematic diagram of another angle of the battery cell according to an embodiment of the present utility model;

[0023] Figure 6 It is Figure 5 a cross-sectional view taken along line A-A shown in

[0024] Figure 7 a schematic diagram of the first pole group, the second pole group and the second support plate according to an embodiment of the present utility model;

[0025] Figure 8 a schematic diagram of the support assembly according to an embodiment of the present utility model;

[0026] Figure 9 a schematic diagram of another angle of the support assembly according to an embodiment of the present utility model;

[0027] Figure 10 It is Figure 9 a cross-sectional view taken along line B-B shown in

[0028] Figure 11 It is Figure 9 a cross-sectional view taken along line C-C shown in

[0029] Figure 12 a schematic diagram of the first support plate according to an embodiment of the present utility model;

[0030] Figure 13 a schematic diagram of another angle of the first support plate according to an embodiment of the present utility model.

[0031] Reference numerals:

[0032] 10, housing; 101, accommodation cavity; 11, second explosion-proof valve;

[0033] 20, first pole group; 21, first pole tab; 30, second pole group; 31, second pole tab;

[0034] 40, first support plate; 401, avoidance hole; 50, second support plate;

[0035] 60, support assembly; 601, avoidance channel;

[0036] 61, first support member; 611, first plate portion; 612, first clamping portion;

[0037] 62, second support member; 621, second plate portion; 622, second clamping portion;

[0038] 70, insulating film; 80, side plate; 90, cover plate assembly; 91, first explosion-proof valve;

[0039] 100, battery cell. Detailed implementation manners

[0040] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0041] Reference will be made below to Figures 1 - 13 describe the battery cell 100 according to the embodiment of the first aspect of the present utility model.

[0042] As Figures 1 - 13 shown, the battery cell 100 according to the embodiment of the first aspect of the present utility model includes: a housing 10, a pole group, and a first support plate 40. The housing 10 has a receiving cavity 101; the pole group extends along a first direction (such as the front-back direction as Figure 4 shown), the number of the pole groups is multiple, the multiple pole groups are arranged at intervals along the first direction and are electrically connected, the pole groups are arranged in the receiving cavity 101, and the multiple pole groups are adapted to be assembled into the receiving cavity 101 along the first direction; the number of the first support plates 40 is multiple, and the adjacent two pole groups are respectively provided with the first support plates 40 on the two end faces arranged opposite to each other in the first direction, and the end faces are fixedly connected to the first support plates 40.

[0043] In this embodiment, the number of the pole groups is set to be multiple, and the multiple pole groups all extend along the first direction and are electrically connected. The multiple pole groups cooperate to form the pole group structure of the battery cell 100. The original single pole group with a longer length dimension is set into multiple pole groups with shorter length dimensions. That is to say, the overall pole group of the battery cell 100 is set into a split-type pole group. Thus, when the length dimension of the battery cell 100 is relatively long, the pole groups in the battery cell 100 can still have shorter length dimensions. The pole groups with shorter dimensions are not prone to wrinkles, deformation and other defects when being assembled into the receiving cavity 101 of the housing 10. Thus, the overall structure of the multiple pole groups can well maintain a stable structural state, and the production and processing of the battery cell 100 can maintain a good product yield. The length dimension here refers to the dimension of the battery cell 100 along the first direction in this embodiment. For example, the number of the pole groups can be two, three, four, etc., and the number of the pole groups can be reasonably set according to needs. The length dimensions of each pole group along the first direction can be the same or different to better adapt to the equipment production line.

[0044] In this embodiment, multiple electrode groups are assembled into the accommodation cavity 101 along the first direction. Specifically, the multiple electrode groups can be pre-assembled outside the housing 10 and then integrally assembled into the accommodation cavity 101 along the first direction. In this embodiment, a plurality of first support plates 40 are provided. The two end faces of two adjacent electrode groups arranged opposite to each other in the first direction are respectively provided with a first support plate 40, that is, a first support plate 40 can be fixed to one end face of an electrode group facing the adjacent electrode group. The first support plate 40 can be fixedly connected to the electrode group by means of bonding or hot melting.

[0045] The first support plate 40 can play a role in strengthening the structure of the electrode group, making the integrity of the electrode group better. The first support plate 40 is arranged at one end of the electrode group along the first direction, and can well bear and transmit the resistance and thrust when the multiple electrode groups move along the first direction. When the multiple electrode groups are integrally assembled into the accommodation cavity 101 along the first direction, when the thrust applied along the first direction on the electrode group is transmitted between the multiple electrode groups, the acting force can be evenly and stably transmitted to another electrode group through the first support plate 40, and the resistance during the movement can also be more evenly and stably transmitted among the multiple electrode groups through the first support plate 40, so that the thrust can act on the multiple electrode groups more smoothly, so that the multiple electrode groups can better maintain a stable structural state during the movement, thereby further reducing the risk of damage to the electrode group due to problems such as wrinkles, deformation, and fracture, and enabling the battery cell 100 to have a better yield in the assembly process.

[0046] For the battery cell 100 according to the embodiment of the present invention, by providing a plurality of electrode groups, the plurality of electrode groups extend along the first direction and are arranged at intervals in the first direction, and the plurality of electrode groups are electrically connected. The two end faces of two adjacent electrode groups arranged opposite to each other in the first direction are respectively fixed with a first support plate 40, so that when the length dimension of the battery cell 100 is relatively long, the electrode groups of the battery cell 100 can still maintain a stable and reliable structural state during assembly, greatly reducing the risk of damage to the electrode group due to problems such as deformation and fracture, and making the yield of the battery cell 100 in the assembly process higher.

[0047] In some embodiments of the present invention, as Figure 4 and Figure 7 shown, the number of electrode groups can be two. The two electrode groups are respectively formed as a first electrode group 20 and a second electrode group 30. In the first direction, a first tab 21 is provided at one end of the first electrode group 20 facing the second electrode group 30, and a second tab 31 is provided at one end of the second electrode group 30 facing the first electrode group 20. The first support plate 40 is provided with an avoidance hole 401. The first tab 21 and the second tab 31 have opposite polarities and respectively pass through the avoidance hole 401, and the first tab 21 and the second tab 31 are electrically connected.

[0048] In this embodiment, the number of pole groups is set to two, the structure is simple, and the number of pole groups is small while the size of the pole groups is kept short, so as to facilitate the assembly of the battery cell 100 and improve the integrity and compactness of the pole group structure in the battery cell 100. In this embodiment, the two pole groups are respectively set as the first pole group 20 and the second pole group 30, and the first support plate 40 can be fixed to the end surface of the first pole group 20 facing the second pole group 30, and the first support plate 40 can be fixed to the end surface of the second pole group 30 facing the first pole group 20.

[0049] In this embodiment, the first pole group 20 is provided with a first pole ear 21, and the second pole group 30 is provided with a second pole ear 31. The first pole ear 21 and the second pole ear 31 have opposite polarities and are electrically connected. The structure is simple, and the first pole group 20 and the second pole group 30 can form an integrally connected passage, so that the first pole group 20 and the second pole group 30 can cooperate to form the pole group structure of the battery cell 100, meeting the use requirements of the battery cell 100. The direct connection between the first pole ear 21 and the second pole ear 31 can avoid the use of a connector, so that the space in the accommodating cavity 101 can be more fully used, and the increase in resistance can be avoided, so that the battery cell 100 can have a greater energy density to a certain extent, and the production cost of the battery cell 100 is reduced.

[0050] In this embodiment, a avoidance hole 401 is provided on the first support plate 40 to facilitate the connection between the first pole tab 21 and the second pole tab 31 . The arrangement position of the avoidance hole 401 on the first support plate 40 can be arranged accordingly according to the arrangement position of the first pole tab 21 and the second pole tab 31 .

[0051] In one embodiment of the present invention, reference Figure 4 and Figure 7 As shown, the battery cell 100 may further include a second support plate 50, in a first direction, the second support plate 50 is fixedly connected to an end of the first pole group 20 that faces away from the second pole group 30, and / or, the second support plate 50 is fixedly connected to an end of the second pole group 30 that faces away from the first pole group 20.

[0052] In this embodiment, a second support plate 50 is fixed to one end of the first electrode group 20 facing away from the second electrode group 30, or a second support plate 50 is fixed to one end of the second electrode group 30 facing away from the first electrode group 20, or second support plates 50 are provided at both the end of the first electrode group 20 facing away from the second electrode group 30 and the end of the second electrode group 30 facing away from the first electrode group 20. When the first electrode group 20 and the second electrode group 30 are integrally assembled into the accommodation cavity 101 of the housing 10 in the first direction, the acting force applied to the electrode group can first act on the second support plate 50, so that the second support plate 50 can uniformly and stably transmit the acting force to the first electrode group 20 or the second electrode group 30 in the first direction. Thus, when the first electrode group 20 and the second electrode group 30 are assembled into the accommodation cavity 101, a balanced, stable and uniform thrust action can be obtained, thereby further improving the overall structural stability of the first electrode group 20 and the second electrode group 30.

[0053] The cooperation between the second support plate 50 and the first support plate 40 can strengthen and protect the structure of the electrode group well during the assembly process, improve the assembly efficiency to a certain extent when the first electrode group 20 and the second electrode group 30 are assembled into the accommodation cavity 101 of the housing 10, and thus make the assembly production of the battery cell 100 more efficient. Preferably, the second support plate 50 can be arranged on the side of the first electrode group 20 facing away from the second electrode group 30 or on the side of the second electrode group 30 facing away from the first electrode group 20, which can reduce the number of the second support plates 50 and make the space utilization rate in the battery cell 100 higher.

[0054] In an embodiment of the present invention, the thickness of the first support plate 40 can be greater than 0.3 mm and less than 2 mm. In this way, the first support plate 40 can have sufficient structural strength to stably and uniformly transmit the acting force to meet the use requirements, and the thickness of the first support plate 40 is small, so that the first support plate 40 can occupy a small space in the accommodation cavity 101, and thus the space utilization rate in the battery cell 100 can be higher. For example, the thickness of the first support plate 40 can be 0.35 mm, 0.38 mm, 0.4 mm, 0.41 mm, 0.49 mm, 0.5 mm, etc.

[0055] In an embodiment of the present invention, the thickness of the second support plate 50 can be greater than 0.3 mm and less than 0.5 mm. In this way, the second support plate 50 can have sufficient structural strength to stably and uniformly transmit the acting force to meet the use requirements, and the thickness of the second support plate 50 is small, so that the second support plate 50 can occupy a small space in the accommodation cavity 101, and thus the space utilization rate in the battery cell 100 can be higher. For example, the thickness of the second support plate 50 can be 0.35 mm, 0.38 mm, 0.4 mm, 0.41 mm, 0.49 mm, 0.5 mm, etc.

[0056] In an embodiment of the present utility model, referring to Figure 6 and Figure 9 shown, the battery cell 100 may further include a support assembly 60. The support assembly 60 is disposed between the first electrode group 20 and the second electrode group 30. In the first direction, both sides of the support assembly 60 are respectively abutted against the first support plate 40. The support assembly 60 is formed with an avoidance channel 601, and the first tab 21 and the second tab 31 are passed through the avoidance channel 601.

[0057] In this embodiment, the support assembly 60 is provided. The support assembly 60 is abutted against the two first support plates 40, so that the first electrode group 20 and the second electrode group 30 form a stable and reliable connection structure in the first direction through the first support plate 40 and the support assembly 60, and the first electrode group 20 and the second electrode group 30 can maintain a stable positional relationship in the first direction. Therefore, when the first electrode group 20 and the second electrode group 30 are assembled into the accommodation cavity 101, the thrust and resistance can be stably and evenly transmitted between the first electrode group 20 and the second electrode group 30 through the support assembly 60, so that the first electrode group 20 and the second electrode group 30 can better maintain a stable structural state during the movement process, thereby further improving the yield rate during the assembly and processing of the battery cell 100.

[0058] It can be understood that the first tab 21 and the second tab 31 have a certain length. After the first tab 21 and the second tab 31 are electrically connected, for example, after the first tab 21 and the second tab 31 are welded and connected, the first tab 21 and the second tab 31 need to maintain a stable current path. In this embodiment, the support assembly 60 is provided. The support assembly 60 is formed with an avoidance channel 601, so that the first tab 21 and the second tab 31 can pass through the avoidance channel 601 for convenient connection, and the structure of the support assembly 60 can play a good role in structural support and limitation for the first tab 21 and the second tab 31, so that the first tab 21 and the second tab 31 can maintain a stable and reliable connection state, so that the first electrode group 20 and the second electrode group 30 can stably form a current path. At the same time, the situation of the first tab 21 and the second tab 31 overlapping can be avoided, so that the first tab 21 and the second tab 31 can well form a single and stable current path, so that the battery cell 100 operates more stably during use.

[0059] In an embodiment of the present utility model, as Figure 8 shown, the support assembly 60 may include: a first support member 61 and a second support member 62. The first support member 61 and the second support member 62 are along the second direction (such as Figure 8They are arranged in the left - right direction (as shown) and are snap - connected. The first support member 61 includes a first plate portion 611, and the second support member 62 includes a second plate portion 621. Both the first plate portion 611 and the second plate portion 621 extend along the second direction. Among them, the projected portions of the first plate portion 611 and the second plate portion 621 on the projection plane perpendicular to the first direction overlap. In the first direction, there is a gap between the first plate portion 611 and the second plate portion 621 to cooperate to define an avoidance channel 601. The second direction intersects the first direction.

[0060] In this embodiment, the support assembly 60 is provided with a first support member 61 and a second support member 62. The first support member 61 and the second support member 62 are arranged in the second direction and are snap - connected. The structure is simple, which is convenient for assembly and disassembly, and can facilitate the formation of an avoidance channel 601 that communicates the two ends of the support assembly 60 in the first direction, so that the connection of the first tab 21 and the second tab 31 is more convenient.

[0061] In this embodiment, the first support member 61 includes a first plate portion 611, and the second support member 62 includes a second plate portion 621. Both the first plate portion 611 and the second plate portion 621 extend along the second direction. The projected portions of the first plate portion 611 and the second plate portion 621 on the projection plane perpendicular to the first direction overlap. That is to say, in the first direction, the first plate portion 611 partially obscures the second plate portion 621, and there is a gap between the first plate portion 611 and the second plate portion 621 in the first direction. Exemplarily, when the first tab 21 and the second tab 31 are connected and pass through the avoidance channel 601, the first tab 21 can extend from the side of the first plate portion 611 facing away from the second plate portion 621 along the second direction towards the end of the first plate portion 611 that partially overlaps with the second plate portion 621. The first tab 21 bypasses one end of the first plate portion 611 and extends into the avoidance channel 601. Similarly, the second tab 31 extends from the side of the second plate portion 621 facing away from the first plate portion 611 along the second direction towards the end of the second plate portion 621 that partially overlaps with the first plate portion 611. The second tab 31 bypasses one end of the second plate portion 621 and extends into the avoidance channel 601 and is connected to the first tab 21.

[0062] When assembling the battery cell 100, after the first tab 21 is connected to the second tab 31, the first support member 61 and the second support member 62 can move from both sides of the first tab 21 and the second tab 31 in the second direction toward the first tab 21 and the second tab 31 respectively. The first plate portion 611 and the second plate portion 621 can cooperate to apply a force to the first tab 21 and the second tab 31, so that after the first support member 61 and the second support member 62 are snapped in place and assembled with the first electrode group 20 and the second electrode group 30 in place, the first plate portion 611 and the second plate portion 621 can stably and reliably clamp and fix the first tab 21 and the second tab 31, so that the first tab 21 and the second tab 31 can form a structure with a zigzag extension and be stably and reliably supported and fixed by the support assembly 60, so that the overall structural stability of the first electrode group 20 and the second electrode group 30 is better.

[0063] In an example of the present utility model, as Figure 8 shown, in the first direction, the surface of the first plate portion 611 facing the avoidance channel 601 and the surface of the second plate portion 621 facing the avoidance channel 601 can be arranged parallel to each other in the second direction. This can keep the avoidance channel 601 unobstructed within the extension range of the second channel, so that the first tab 21 and the second tab 31 can be stably and well arranged through the avoidance channel 601.

[0064] In some specific embodiments of the present utility model, referring to Figure 8 and Figure 10 shown, in the second direction, the thickness of the first plate portion 611 gradually decreases toward the second plate portion 621, and the thickness of the second plate portion 621 gradually decreases toward the first plate portion 611.

[0065] This can make the ends of the first plate portion 611 facing the second plate portion 621 and the ends of the second plate portion 621 facing the first plate portion 611 have a smaller thickness, so that when the first plate portion 611 is assembled with the first tab 21 and the second tab 31 and the second plate portion 621, one end of the first plate portion 611 has a smaller acting surface with the first tab 21 and the second tab 31, and one end of the second plate portion 621 has a smaller acting surface with the first tab 21 and the second tab 31, so that the first tab 21 and the second tab 31 can be stably bent, and the assembly of the support assembly 60 with the first electrode group 20 and the second electrode group 30 is more stable and convenient.

[0066] In some examples of the present utility model, as Figure 8 shown, the first support member 61 may further include a first engaging portion 612, and the first engaging portion 612 is provided on the first plate portion 611 in the third direction (such as Figure 8At both ends in the up - down direction (as shown), the second support member 62 further includes a second clamping portion 622. The second clamping portion 622 is provided at both ends of the second plate portion 621 in the third direction. The first clamping portion 612 and the second clamping portion 622 are clamped and connected. The third direction intersects with the second direction and the first direction pairwise.

[0067] In this embodiment, the first support member 61 is provided with the first clamping portion 612 at both ends of the first plate portion 611 in the third direction, and the second support member 62 is provided with the second clamping portion 622 at both ends of the second plate portion 621 in the third direction. The structure is simple, which is convenient for the clamping and fixing of the first support member 61 and the second support member 62. The two first clamping portions 612 and the two second clamping portions 622 are clamped and connected in one - to - one correspondence, so that the first plate portion 611 and the second plate portion 621 can form a stable and reliable avoidance channel 601 and have good structural strength, making the overall structural stability and reliability of the support assembly 60 better. Thus, the support assembly 60 can form a stable supporting and fixing effect on the first tab 21 and the second tab 31, and the support assembly 60 can stably and reliably transmit the acting force.

[0068] In this embodiment, the third direction intersects with the second direction and the first direction pairwise, aiming to show that the third direction is not parallel to the first direction and the second direction. For example, the third direction and the second direction can form an acute angle, a right angle or an obtuse angle, the third direction and the first direction can form an acute angle, an obtuse angle or a right angle, and the second direction and the first direction can form an acute angle, an obtuse angle or a right angle.

[0069] In some embodiments of the present utility model, as Figure 1 and Figure 4 shown, the housing 10 can be provided with openings at both ends in the first direction. The openings are communicated with the accommodation cavity 101. The battery cell 100 can further include a cover plate assembly 90. The number of the cover plate assemblies 90 is two and they respectively seal the two openings. Among them, the cover plate assembly 90 is provided with a first explosion - proof valve 91, and the housing 10 is provided with a second explosion - proof valve 11. In the third direction, the second explosion - proof valve 11 is provided between two adjacent pole groups.

[0070] In this embodiment, openings are provided on both sides of the housing 10, and the cover plate assembly 90 seals the openings. The structure is simple and can well meet the needs of the use and assembly of the battery cell 100. In this embodiment, the cover plate assembly 90 is provided with a first explosion - proof valve 91, and the housing 10 is provided with a second explosion - proof valve 11. Among them, in the third direction, the second explosion - proof valve 11 is arranged between two adjacent pole groups. Exemplarily, as Figure 6As shown, the arrows in the figure indicate the flow direction of the gas. The electrode group includes a first electrode group 20 and a second electrode group 30. In the third direction, the second explosion-proof valve 11 can be arranged opposite to the position between the first electrode group 20 and the second electrode group 30. When the battery cell 100 exhausts gas, near the part between the first electrode group 20 and the second electrode group 30, the gas can flow out from the second explosion-proof valve 11, and near the cover plate assembly 90, the gas can be discharged from the first explosion-proof valve 91.

[0071] In this embodiment, by arranging the second explosion-proof valve 11 on the housing 10, and the second explosion-proof valve 11 is arranged at the position of the housing 10 between two adjacent electrode groups, so that when the length dimension of the battery cell 100 is relatively long, the gas at the middle position of the battery cell 100 can be discharged from the second explosion-proof valve 11 relatively quickly, avoiding the long gas flow path when the gas flows along the first direction to the first explosion-proof valve 91 for discharge, greatly improving the exhaust efficiency of the battery cell 100, and thus making the battery cell 100 safer.

[0072] In some embodiments of the present invention, as Figure 4 shown, the battery cell 100 may further include: an insulating film 70 and a side plate 80. The insulating film 70 is sleeved on the outer peripheral side of a plurality of electrode groups, and the insulating film 70 is arranged between the plurality of electrode groups and the inner wall of the accommodation cavity 101; the side plate 80 extends along the first direction, the side plate 80 is arranged between the insulating film 70 and the inner wall of the accommodation cavity 101, and the side plate 80 is located on one side of the electrode group in the third direction.

[0073] In this embodiment, arranging the insulating film 70 to cover the outer peripheral side of a plurality of electrode groups can well play a role in insulating and separating the electrode groups from the housing 10, so that the battery cell 100 can have good safety performance. In this embodiment, the side plate 80 is arranged between the insulating film 70 and the inner wall of the accommodation cavity 101, and the side plate 80 can play a role in structurally strengthening and protecting the electrode groups, greatly reducing the probability of deformation and fracture of the electrode groups when they collide with the housing 10 when the electrode groups are assembled into the accommodation cavity 101, further improving the structural stability of the electrode groups, enabling the electrode groups to be assembled into the accommodation cavity 101 more stably and conveniently during assembly, and making the overall structural stability of the battery cell 100 better.

[0074] In some embodiments of the present invention, the first support plate 40 may be an insulating member. This can well meet the need for electrical isolation between a plurality of electrode groups, enabling the battery cell 100 to operate stably.

[0075] In some embodiments of the present invention, the second support plate 50 may be an insulating member. This can well meet the need for electrical isolation between a plurality of electrode groups, enabling the battery cell 100 to operate stably.

[0076] Reference will be made below to Figures 1 - 13 describe a battery pack according to an embodiment of the second aspect of the present invention.

[0077] As Figures 1 - 13 shown, the battery pack according to an embodiment of the present invention includes a battery cell 100 according to an embodiment of the first aspect of the present invention.

[0078] Other components and operations of the battery pack according to an embodiment of the present invention are known to those of ordinary skill in the art and will not be described in detail here.

[0079] For the battery pack according to an embodiment of the present invention, by providing the battery cell 100 of the above-mentioned first aspect embodiment, by providing a plurality of pole groups, the plurality of pole groups extend in the first direction and are arranged at intervals in the first direction, the plurality of pole groups are electrically connected, and first support plates 40 are respectively fixed to two end faces opposite in the first direction of two adjacent pole groups. When the length dimension of the battery cell 100 is relatively long, the pole groups of the battery cell 100 can still maintain a stable and reliable structural state during assembly, greatly reducing the risk of damage caused by problems such as deformation and fracture of the pole groups, and making the yield of the assembly and processing of the battery cell 100 higher.

[0080] Reference will be made below to Figures 1 - 13 describe a battery pack according to a specific embodiment of the present invention.

[0081] As Figures 1 - 13 shown, the battery pack includes a battery cell 100, and the battery cell 100 is a battery cell with a relatively large length dimension. The battery cell 100 includes a housing 10, a cover assembly 90, a first pole group 20, a second pole group 30, a first support plate 40, a second support plate 50, a support assembly 60, a side plate 80, and an insulating film 70.

[0082] The shell 10 extends along the first direction, and the shell 10 has an accommodating cavity 101 opened at both ends in the first direction. The cover plate assembly 90 is provided with two and respectively covers the open sides of the accommodating cavity 101. The cover plate assembly 90 is provided with a first explosion-proof valve 91, and the shell 10 is provided with a second explosion-proof valve 11 in the middle position of the first direction; the first pole group 20 and the second pole group 30 both extend along the first direction and are arranged at intervals in the first direction, the first pole group 20 is provided with a first pole ear 21 on the side facing the second pole group 30, and the second pole group 30 is provided with a second pole ear 31 on the side facing the first pole group 20, and the first support plate 40 and the second support plate 50 are both insulating parts. For example, the first support plate 40 and the second support plate 50 can be insulating parts such as polypropylene, polyethylene, polycarbonate, etc. that are insulated and resistant to electrolyte corrosion. Two first support plates 40 are provided, and the first support plate 40 is fixedly connected to the end of the first pole group 20 facing the second pole group 30 by bonding or hot melting. The first support plate 40 is fixedly connected to the end of the second pole group 30 facing the first pole group 20 by bonding or hot melting, and the first support plate 40 is provided with an avoidance hole 401.

[0083] The support assembly 60 includes a first support member 61 and a second support member 62. The first support member 61 and the second support member 62 are arranged along the second direction and are connected by a snap-fit. Specifically, the first snap-fit portion 612 of the first support member 61 can be provided with a snap-fit protrusion, and the second snap-fit portion 622 of the second support member 62 can be provided with a snap-fit groove. The snap-fit protrusion and the snap-fit groove are snap-fitted and connected, so that the first support member 61 and the second support member 62 are snap-fitted and fixed. The first support member 61 and the second support member 62 cooperate to form an avoidance channel 601, and the first pole ear 21 and the second pole ear 31 respectively pass through the avoidance hole 401 and extend into the avoidance channel 601 for welding connection.

[0084] The length dimension of the first pole group 20 and the second pole group 30 in the first direction is the same, so as to facilitate mass production. The second support plate 50 is arranged on the side of the first pole group 20 away from the second pole group 30 and is fixedly connected to the first pole group 20 by bonding or hot melting. Specifically, the second support plate 50 may be formed with a through hole so that another pole ear of the first pole group 20 can pass through, so as to meet the electrical connection requirements of the first pole group 20 and the cover plate assembly 90. The insulating film 70 is a Mylar film, and the insulating film 70 is coated on the outer surface of the overall structure of the first pole group 20 and the second pole group 30, the first support plate 40, the second support plate 50 and the support assembly 60. The side plate 80 includes two, and the side plate 80 extends along the first direction. The two side walls are arranged corresponding to the first pole group 20 and the second pole group 30, respectively, and the side plate 80 is arranged between the insulating film 70 and the inner wall of the accommodating cavity 101 of the shell 10.

[0085] When assembling the battery cell 100, the first electrode group 20 and the second electrode group 30 can be first assembled and fixed to the first support plate 40 and the second support plate 50. The first tab 21 and the second tab 31 are welded together. Then, the first support member 61 and the second support member 62 of the support assembly 60 are clamped and fixed to the first tab 21 and the second tab 31 in cooperation. The support assembly 60 abuts against the two first support plates 40, so that the first electrode group 20 and the second electrode group 30 can form a complete and continuous whole along the first direction.

[0086] After the assembled first electrode group 20, second electrode group 30, support assembly 60, first support plate 40 and second support plate 50 are integrally coated with the insulating film 70, the side plate 80 is arranged on the insulating film 70 and then the whole is assembled into the accommodation cavity 101 from one end of the housing 10. The assembly personnel or the assembly equipment can apply a thrust to the second support plate 50, so that the first electrode group 20, etc. are integrally moved into the accommodation cavity 101 and moved into place, and then the assembly operation of the cover plate assembly 90 and the first electrode group 20, etc. is carried out, thereby completing the assembly of the battery cell 100.

[0087] During the process of assembling the first electrode group 20, etc. into the accommodation cavity 101 of the housing 10, the first support plate 40, the second support plate 50, the support assembly 60 and the side plate 80 cooperate together to play a role of stable, reliable structural support, strengthening and protection for the first electrode group 20 and the second electrode group 30. And in combination with the electrode group structure form of the first electrode group 20 with a shorter size and the electrode group combination, the probability of the first electrode group 20 and the second electrode group 30 being wrinkled, deformed, delaminated, fractured, etc. under the action of thrust and resistance is greatly reduced, so that the overall structural stability of the first electrode group 20 and the second electrode group 30 is better, and the yield rate during the assembly and processing of the battery cell 100 is higher.

[0088] When the battery cell 100 has a thermal runaway, the high-temperature gas located in the middle position can be quickly discharged from the second explosion-proof valve 11, so that the battery cell 100 has better safety performance, and thus the safety of the battery pack is better.

[0089] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0090] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more, unless otherwise specifically defined.

[0091] In the present utility model, unless otherwise clearly specified and defined, terms such as "installed", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0092] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0093] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, Comprising: A housing (10), the housing (10) having a receiving cavity (101); A pole group, the pole group extending in a first direction, the number of the pole groups being multiple, the multiple pole groups being arranged at intervals in the first direction and electrically connected, the pole group being disposed in the receiving cavity (101), and the multiple pole groups being adapted to be assembled into the receiving cavity (101) in the first direction; A first support plate (40), the number of the first support plates (40) being multiple, the first support plates (40) being respectively provided at two end faces of two adjacent pole groups that are oppositely arranged in the first direction, and the end faces being fixedly connected to the first support plates (40).

2. The battery cell according to claim 1, characterized in that, The number of the pole groups is two, the two pole groups are respectively formed as a first pole group (20) and a second pole group (30), in the first direction, a first pole tab (21) is provided at one end of the first pole group (20) facing the second pole group (30), a second pole tab (31) is provided at one end of the second pole group (30) facing the first pole group (20), the first support plate (40) is provided with an avoidance hole (401), the first pole tab (21) and the second pole tab (31) have opposite polarities and respectively pass through the avoidance hole (401), and the first pole tab (21) is electrically connected to the second pole tab (31).

3. The battery cell according to claim 2, wherein It further includes a second support plate (50), in the first direction, the second support plate (50) is fixedly connected to one end of the first pole group (20) facing away from the second pole group (30), and / or, the second support plate (50) is fixedly connected to one end of the second pole group (30) facing away from the first pole group (20).

4. The battery cell according to claim 2, wherein It further includes a support assembly (60), the support assembly (60) being disposed between the first pole group (20) and the second pole group (30), in the first direction, two sides of the support assembly (60) are respectively abutted against the first support plate (40), the support assembly (60) is formed with an avoidance channel (601), and the first pole tab (21) and the second pole tab (31) are passed through the avoidance channel (601).

5. The battery cell according to claim 4, wherein The support assembly (60) includes: a first support member (61) and a second support member (62), the first support member (61) and the second support member (62) are arranged in a second direction and are snap-connected, the first support member (61) includes a first plate portion (611), the second support member (62) includes a second plate portion (621), and the first plate portion (611) and the second plate portion (621) both extend in the second direction, wherein, The projections of the first plate portion (611) and the second plate portion (621) on a projection plane perpendicular to the first direction partially overlap, and in the first direction, there is a gap between the first plate portion (611) and the second plate portion (621) to cooperatively define the avoidance channel (601), and the second direction intersects with the first direction.

6. The battery cell according to claim 5, characterized in that, The first support member (61) further includes a first clamping portion (612), the first clamping portion (612) is provided at both ends of the first plate portion (611) in the third direction, the second support member (62) further includes a second clamping portion (622), the second clamping portion (622) is provided at both ends of the second plate portion (621) in the third direction, the first clamping portion (612) is in clamping connection with the second clamping portion (622), and the third direction intersects with the second direction and the first direction pairwise.

7. The battery cell according to claim 1, characterized in that Openings are provided at both ends of the housing (10) in the first direction, the openings communicate with the accommodation cavity (101), the battery cell further includes a cover plate assembly (90), the number of the cover plate assemblies (90) is two and they respectively seal the two openings. Wherein, the cover plate assembly (90) is provided with a first explosion-proof valve (91), the housing (10) is provided with a second explosion-proof valve (11), and in the third direction, the second explosion-proof valve (11) is provided between two adjacent pole groups.

8. The battery cell according to claim 1, characterized in that, The thickness of the first support plate (40) is greater than 0.3 mm and less than 2 mm.

9. The battery cell according to claim 1, characterized in that, Further comprising: An insulating film (70), the insulating film (70) is sleeved on the outer peripheral sides of a plurality of the pole groups, and the insulating film (70) is provided between the plurality of pole groups and the inner wall of the accommodation cavity (101); A side plate (80), the side plate (80) extends along the first direction, the side plate (80) is provided between the insulating film (70) and the inner wall of the accommodation cavity (101), and the side plate (80) is located on one side of the pole group in the third direction.

10. A battery pack, characterized in that, Comprising a battery cell according to any one of claims 1-9.

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