Battery and assembly method thereof

Abstract

The present invention relates to the field of battery technology, and more particularly to a battery and an assembly method thereof. The battery provided by the present invention is provided with at least one relatively large side surface extending outward from its inner wall in a direction away from the interior of the shell to form a groove with a through hole, and a pole assembly is provided corresponding to the groove, so that the pole assembly is provided on the relatively large side surface of the shell, so that the pole lug of the pole group can be welded to the pole of the pole assembly without bending, avoiding the problem that the conventional pole lug needs to be bent before being welded to the pole, and the bending state of the pole lug cannot be controlled, which may cause a loose connection. At the same time, by providing a groove extending outward from its inner wall in a direction away from the interior of the shell, an external connection plate provided on the outside of the shell protrudes from the outer surface of the shell, which is convenient for operation when the battery needs to be connected to an external circuit in the later stage.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery and an assembling method thereof. Background Art

[0002] Currently, prismatic batteries for electric vehicles are gradually becoming longer and thinner, posing significant challenges to their structure, assembly, and packaging. Prismatic batteries primarily consist of a housing, a cover, and an electrode assembly. The cover houses positive and negative electrode posts, which are welded to the electrode assembly tabs inside the housing. These tabs are typically assembled from dozens of layers of electrode tabs, which are then bent and welded to the electrode posts. However, due to the large number of electrode layers, the bending state of the tabs on each layer cannot be accurately controlled, and the bending state of the tabs cannot be directly observed during assembly. This creates inconvenience during battery assembly and makes it difficult to ensure stable battery performance. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect of inconvenient battery assembly in the prior art, thereby providing a battery that is easy to assemble and an assembly method thereof.

[0004] In order to solve the above problems, the present invention provides a battery, comprising: a shell, comprising a first side surface, a third side surface, a second side surface and a fourth side surface connected in sequence end to end, the area of ​​the first side surface and the second side surface is larger than the area of ​​the third side surface and the fourth side surface, and at least one side surface with a relatively large area extends outward from its inner wall in a direction away from the interior of the shell to form a groove with a through hole; at least one pole assembly is arranged corresponding to the groove, the pole assembly comprises an inner connecting plate, an outer connecting plate and a pole, the inner connecting plate is arranged on the inner side of the shell, the outer connecting plate is arranged on the outer side of the shell, and the pole passes through the inner connecting plate, the shell and the outer connecting plate in sequence; a pole group is arranged in the shell, the pole group has pole ears equal to the number of pole assemblies, the pole ears correspond to the pole assemblies one by one and are electrically connected, and the space formed between the side of the pole assembly facing the interior of the shell and the shell is suitable for the passage of the pole group; a cover plate is arranged at at least one end of the shell along the first direction to close the shell.

[0005] Optionally, the battery further includes: a fixing bracket, which is arranged between the electrode group and the cover plate, with one side of the fixing bracket abutting against the electrode group and the other side abutting against the cover plate.

[0006] Optionally, the first side surface and the second side surface are arranged oppositely and parallel to each other, and at least one end of at least one of the first side surface and the second side extends beyond a portion relative to the opposite surface along the first direction to form an extension portion, and the groove is arranged on the extension portion.

[0007] Optionally, the inner connecting plate is installed in the groove, the outer connecting plate is installed on a side of the groove away from the interior of the shell, and the pole is passed through the through hole.

[0008] Optionally, the side of the inner connecting plate facing the inside of the shell is flush with the inner wall of the shell, or the side of the inner connecting plate facing the inside of the shell is lower than the inner wall of the shell, or the side of the inner connecting plate facing the inside of the shell is higher than the inner wall of the shell.

[0009] Optionally, a height difference between a surface of the inner connecting plate facing the interior of the shell and an inner surface of the shell is 0-2 mm.

[0010] Optionally, the third side surface and the fourth side surface are parallelogram, trapezoidal, rectangular or stepped.

[0011] The present invention also provides a battery assembly method for assembling the above-mentioned battery, the battery assembly method comprising: preparing a pole group; pre-welding the pole ears of the pole group; cutting the pre-welded pole ears; coating the pole group assembly; pushing the coated pole group assembly into the shell from the open end of the shell; welding the pole ears to the poles of the pole assembly provided on the shell; and welding the cover plate to the shell.

[0012] Optionally, the battery further includes a fixing bracket installed between the electrode group and the cover plate.

[0013] The electrode group assembly includes an electrode group and a fixing bracket. The electrode group assembly is coated by: coating the fixing bracket and the electrode group together to fix the fixing bracket and the electrode group;

[0014] Alternatively, the electrode assembly is a electrode group, and coating the electrode assembly includes: coating the electrode group, and after welding the electrode tab and the electrode column assembly, further including: placing the fixing bracket into the shell and abutting against the electrode group.

[0015] Optionally, the pole group assembly includes an inner connecting plate, an outer connecting plate and a pole, and before pushing the coated pole group assembly into the shell from the open end of the shell, it also includes: placing the inner connecting plate on the inner side of the shell; placing the outer connecting plate on the outer side of the shell and opposite to the inner connecting plate; passing the pole through the inner connecting plate, the shell and the outer connecting plate in sequence, and fixing them.

[0016] The present invention has the following advantages:

[0017] 1. The battery provided by the present invention is provided with at least one side surface with a relatively large area extending outward from its inner wall in a direction away from the interior of the shell to form a groove with a through hole, and a pole assembly is provided corresponding to the groove, so that the pole assembly is arranged on the side surface of the shell with a relatively large area, so that the pole lug of the pole group can be welded to the pole of the pole assembly without bending, avoiding the problem that the conventional pole lug needs to be bent before being welded to the pole, and the bending state of the pole lug cannot be controlled, which may cause a loose connection. At the same time, by providing the groove extending outward from the side surface in a direction away from the interior of the shell, the external connection plate arranged on the outside of the shell protrudes from the outer surface of the shell, which is convenient for operation when the battery needs to be connected to an external circuit in the later stage; the shell is closed by directly installing a cover plate on the end of the shell, which, on the one hand, fixes the pole group, and on the other hand, the size of the cover plate is relatively small, the sealing path is short, and the difficulty of assembly and sealing is reduced.

[0018] 2. The battery assembly method provided by the present invention first pushes the electrode group into the shell from the open end of the shell, and then welds the electrode tab to the pole post assembly. Since the pole post assembly is arranged on the side of the shell, after the electrode group is placed in the shell, the electrode tab can be directly welded to the pole post assembly without bending. In addition, there is no side of the shell blocking the top of the pole post assembly, and it is convenient to directly observe whether the electrode tab is installed in place and the status of the electrode tab from the opening above the pole post assembly, avoiding the problem of loose connection caused by the traditional electrode tab needing to be bent before being welded to the pole and the bending status cannot be directly observed and controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 FIG2 shows a schematic diagram of the external structure of a battery according to the first embodiment of the present invention;

[0021] Figure 2 Shown Figure 1 Schematic diagram of the explosion of the battery;

[0022] Figure 3 Shown Figure 1 An exploded diagram of a battery from another perspective;

[0023] Figure 4 Shown Figure 2 A partial enlarged schematic diagram of one end of the negative electrode column assembly of a battery;

[0024] Figure 5 Shown Figure 1 A schematic front view of a battery;

[0025] Figure 6 Shown Figure 1 A schematic structural diagram of a battery from a bottom perspective;

[0026] Figure 7 A schematic structural diagram of a battery housing according to a first embodiment of the present invention is shown;

[0027] Figure 8 Shown Figure 7 A schematic diagram of the structure of one end of the positive electrode column assembly of the middle battery shell;

[0028] Figure 9 Shown Figure 7 A schematic diagram of the structure of one end of the negative electrode column assembly of the battery shell;

[0029] Figure 10 shows a schematic structural diagram of the electrode group of embodiment 1;

[0030] Figure 11 Shown Figure 10 A top view of the pole group;

[0031] Figure 12 FIG2 shows a schematic diagram of the external structure of a battery according to the second embodiment of the present invention;

[0032] Figure 13 Shown Figure 12 Schematic diagram of the explosion of the battery;

[0033] Figure 14 FIG2 shows a schematic diagram of the external structure of a battery according to a third embodiment of the present invention;

[0034] Figure 15 Shown Figure 14 A schematic diagram of the external structure of the battery from another perspective;

[0035] Figure 16 Shown Figure 14 Schematic diagram of the explosion of the battery;

[0036] Figure 17 Shown Figure 16 An exploded diagram of a battery from another perspective;

[0037] Figure 18 Schematic diagram showing the external structure of a battery according to a fourth embodiment of the present invention;

[0038] Figure 19 Shown Figure 18 Schematic diagram of the explosion of the battery;

[0039] Figure 20 FIG2 shows a schematic diagram of the external structure of a battery according to a fifth embodiment of the present invention;

[0040] Figure 21 Shown Figure 20 Schematic diagram of the explosion of the battery;

[0041] Figure 22 FIG2 shows a schematic diagram of the external structure of a battery according to a sixth embodiment of the present invention;

[0042] Figure 23 Shown Figure 22 A schematic diagram of the external structure of the battery from another perspective;

[0043] Figure 24 Shown Figure 22 Schematic diagram of the explosion of the battery;

[0044] Figure 25 Shown Figure 22 An exploded diagram of a battery from another perspective;

[0045] Figure 26 FIG2 shows a schematic diagram of the external structure of a battery according to a seventh embodiment of the present invention;

[0046] Figure 27 Shown Figure 26 A schematic diagram of the structure of the battery from the bottom perspective;

[0047] Figure 28 Shown Figure 26 Schematic diagram of the explosion of the battery;

[0048] Figure 29 Shown Figure 26 Schematic diagram of a partial explosion of a battery;

[0049] Figure 30 Shown Figure 26 A schematic front view of a battery;

[0050] Figure 31 A schematic structural diagram of a battery housing according to a seventh embodiment of the present invention is shown;

[0051] Figure 32 Shown Figure 31 Explosion diagram of the shell;

[0052] Figure 33 Schematic diagram showing the structure of an electrode group of a battery according to a seventh embodiment of the present invention;

[0053] Figure 34 Shown Figure 33 A top view of the pole group;

[0054] Figure 35FIG2 shows a schematic diagram of the external structure of a battery according to an eighth embodiment of the present invention;

[0055] Figure 36 Shown Figure 35 Schematic diagram of the battery explosion.

[0056] Description of reference numerals:

[0057] 101. First side surface; 102. Second side surface; 103. Third side surface; 104. Fourth side surface; 105. First end surface; 106. Second end surface; 107. Positive electrode column assembly; 1071. Positive electrode inner connecting plate; 1072. Positive electrode inner insulating member; 1073. Positive electrode column; 1074. Positive electrode inner seal; 1075. Positive electrode outer seal; 1076. Positive electrode outer insulating member; 1077. Positive electrode outer connecting plate; 1078. Fuse; 108. Negative electrode column assembly; 1081. Negative electrode inner connecting plate; 1082. Negative electrode inner insulating member; 1083. Negative electrode column; 1084. Negative electrode inner seal; 1085 , negative electrode outer sealing member; 1086, negative electrode outer insulating member; 1087, negative electrode external connecting plate; 109, safety valve; 110, injection hole; 11, shell; 12, cover plate; 121, first cover plate; 122, second cover plate; 13, pole group; 130, pole ear; 1301, positive pole ear; 1302, negative pole ear; 131, positive electrode sheet; 132, negative electrode sheet; 133, diaphragm; 134, tape; 135, insulating film; 136, insulating tape; 14, fixing bracket; 141, positive electrode fixing bracket; 142, negative electrode fixing bracket; 143, reserved hole; 201, first extension portion; 202, second extension portion. DETAILED DESCRIPTION

[0058] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0059] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0060] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0061] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0062] It should be noted that, in order to simplify the description, the same figure marks are used to represent the structural features in the same orientation in each embodiment of the present invention. Those skilled in the art should understand that the same figure marks in each embodiment do not limit the structures to be completely consistent, but should be understood as the specific structural form of the structure corresponding to a certain figure mark in the embodiment to be reasonably determined according to the specific circumstances of each embodiment.

[0063] Eight embodiments of the battery are described below:

[0064] Example 1

[0065] like Figures 1 to 11 As shown, the battery of this embodiment includes: a shell 11, an electrode group 13 and a cover plate, the shell 11 includes a first side surface 101, a third side surface 103, a second side surface 102 and a fourth side surface 104 connected in sequence end to end, the area of ​​the first side surface 101 and the second side surface 102 is larger than the area of ​​the third side surface 103 and the fourth side surface 104, at least one side surface with a relatively large area extends outward from its inner wall in a direction away from the interior of the shell 11 to form a groove with a through hole; at least one pole assembly is arranged corresponding to the groove, and the pole assembly includes an inner connecting plate, an outer connecting plate and The pole, the inner connecting plate is arranged on the inner side of the shell 11, the outer connecting plate is arranged on the outer side of the shell 11 and protrudes from the outer surface of the shell 11, and the pole passes through the inner connecting plate, the shell 11 and the outer connecting plate in sequence; the pole group 13 is arranged in the shell 11, and the pole group 13 has pole ears 130 equal to the number of pole components. The pole ears 130 correspond to the pole components one by one and are electrically connected. The space formed between the side of the pole component facing the inside of the shell 11 and the shell 11 is suitable for the passage of the pole group 13; the cover plate 12 is arranged at at least one end of the shell 11 along the first direction to close the shell 11. The shell 11 has an inner cavity suitable for accommodating the pole group 13. The inside of the shell 11 and the inner side of the shell 11 both refer to the side of the shell 11 facing its inner cavity, and the outer side of the shell 11 refers to the side of the shell 11 away from its inner cavity; the first direction refers to Figure 2The "first direction" indicated by the arrow in the middle (i.e., the x-axis direction of the rectangular coordinate system in the figure); the first side surface 101 and the second side surface 102 are two opposite surfaces of the shell 11 along the thickness direction (i.e., the z-axis direction of the rectangular coordinate system in the figure). It should be noted that at least one side surface with a relatively large area refers to at least one of the first side surface 101 and the second side surface 102, and then at least one of the first side surface 101 and the second side surface 102 is provided with a groove, so that the pole assembly corresponding to the groove is arranged on the side of the shell 11, and after the pole group 13 is placed in the shell 11, the pole lugs of the pole group 13 correspond one-to-one with the pole assembly on the side of the shell 11; the pole of the pole assembly passes through the side of the shell 11, and the end of the pole located on the inner side of the shell 11 is suitable for electrical connection with the pole lug 130, and the end of the pole located on the outer side of the shell 11 is suitable for electrical connection with the circuit outside the battery or another battery.

[0066] The battery using this embodiment is provided with at least one side surface with a relatively large area extending outward from its inner wall in a direction away from the interior of the shell to form a groove with a through hole, and a pole assembly is provided corresponding to the groove, so that the pole assembly is provided on the side surface with a relatively large area of ​​the shell 11, so that the pole lug 130 of the pole group 13 can be welded to the pole of the pole assembly without bending, avoiding the problem that the traditional pole lug 130 needs to be bent before being welded to the pole, and the bending state of the pole lug cannot be controlled, which may cause a loose connection. At the same time, by providing a groove extending outward from the side surface from its inner wall in a direction away from the interior of the shell, the external connection plate provided on the outside of the shell 11 protrudes from the outer surface of the shell 11, which is convenient for operation when the battery needs to be connected to an external circuit in the later stage; the shell 11 is closed by directly installing the cover plate 12 at the end of the shell 11, which, on the one hand, fixes the pole group 13, and on the other hand, the size of the cover plate is relatively small, the sealing path is short, and the difficulty of assembly and sealing is reduced.

[0067] It should be noted that the inner connecting plate and the outer connecting plate are connected via poles. Optionally, the connection method may be riveting, laser welding, or bolt connection.

[0068] In this embodiment, the first side surface 101 and the second side surface 102 are arranged opposite and parallel to each other, and at least one end of at least one of the first side surface 101 and the second side surface 102 extends beyond the opposing side along the first direction to form an extension portion, and the groove is provided on the extension portion. It should be noted that the extension portion is a portion of one side surface that extends beyond the opposing side along the first direction at one end. Therefore, the opposing side corresponding to the portion of the side surface provided with the extension portion is not obstructed by the side surface of the housing 11, resulting in a notched corner of the battery. When at least two batteries are stacked, the external connection plate of one battery corresponds to the notched corner of the adjacent battery, which rationally utilizes space, reduces the thickness of the stacked batteries, and protects the battery terminals from damage.

[0069] Specifically, in this embodiment, both ends of the second side surface 102 are larger than the first side surface 101 along the first direction to form two extensions, each of which is provided with a groove. That is, the length of the first side surface 101 is smaller than the length of the second side surface 102, and the length of both ends of the second side surface 102 along the first direction is larger than the opposite side, wherein the length refers to the length along the first direction. Figure 2 The arrow in the middle points to the dimension in the “length direction” (i.e., the x-axis direction in the rectangular coordinate system, which is also the same direction as the first direction).

[0070] In the battery using this embodiment, an extension portion is formed by arranging at least one end of the second side surface 102 of the shell 11 to extend beyond the first side surface 101 along the first direction, so that the opposite surface of the extension portion is not blocked by the first side surface 101, and a groove is provided on the extension portion, so that after the electrode group 13 is placed in the shell 11, the position and status of the electrode tab 130 can be directly observed, thereby avoiding the problem of loose connection caused by the traditional electrode tab 130 needing to be bent before being welded to the electrode column and the bending status cannot be directly observed and controlled.

[0071] Preferably, the shell 11 is made of aluminum or stainless steel, which are common, easy to obtain and convenient to process.

[0072] Specifically, the electrode assembly 13 consists of a positive electrode sheet 131, a negative electrode sheet 132, a separator 133, a tape 134 for securing the electrode assembly, and an insulating film 135 or insulating tape 136 for insulation protection. The positive electrode sheet 131, negative electrode sheet 132, and separator 133 are wound or laminated to form the electrode assembly. Preferably, the negative electrode sheet 132, separator 133, positive electrode sheet 131, and negative electrode sheet 132 are stacked in sequence in a "Z"-shaped stacking arrangement and secured with tape 134. The positive and negative electrode tabs 1301 and 1302 are pre-welded and offset to one side of the electrode assembly 13 near the second side surface 102 of the housing 11, with the positive and negative tabs positioned in mirror-image symmetry. The number of electrode assemblies 13 ranges from 1 to 6, preferably from 1 to 4.

[0073] In this embodiment, the battery further includes: a fixing bracket 14, which is arranged between the electrode group 13 and the cover plate 12, with one side of the fixing bracket 14 abutting against the electrode group 13 and the other side abutting against the cover plate 12, wherein the other side refers to the side of the fixing bracket 14 away from the electrode group 13. By arranging the fixing bracket 14 between the electrode group 13 and the cover plate 12, and with the two ends of the fixing bracket 14 abutting against the electrode group 13 and the cover plate 12 respectively, the fixing bracket 14 is stuck between the electrode group 13 and the cover plate 12, thereby achieving the function of fixing and insulating the electrode group 13, preventing the electrode group 13 from shaking in the housing 11, and improving the stability of the structure. Optionally, to simplify assembly, the fixing bracket 14 and the cover plate 12 can be pre-assembled and fixed into a whole by encapsulation.

[0074] Preferably, the cross-section of the fixing bracket 14 is triangular, with the three sides of the triangle respectively abutting against the electrode assembly 13, the extension portion, and the cover plate 12, resulting in a stable structure and high reliability. It should be noted that the electrode assembly 13 has a positive electrode tab 1301 and a negative electrode tab 1302 disposed at either end. Accordingly, the end of the battery corresponding to the positive electrode tab 1301 is the positive terminal, and the end corresponding to the negative electrode tab 1302 is the negative terminal. There are two fixing brackets 14, namely a positive electrode fixing bracket 141 and a negative electrode fixing bracket 142. The positive electrode fixing bracket 141 is disposed at the positive terminal of the battery, and the negative electrode fixing bracket 142 is disposed at the negative terminal of the battery.

[0075] In this embodiment, the side of the inner connecting plate facing the interior of the housing 11 is flush with the inner wall of the housing 11. Therefore, during the insertion of the pole group 13 into the housing, the inner connecting plate will not hinder the movement of the pole group 13, thereby avoiding scratching the surface of the pole group 13, thereby improving the smooth progress of the assembly process and the safety of the pole group. It can be understood that as an alternative embodiment, the side of the inner connecting plate facing the interior of the housing 11 is lower than the inner wall of the housing 11, that is, the surface of the side of the pole assembly facing the interior of the housing 11 is recessed relative to the inner wall surface of the housing 11 in a direction away from the interior of the housing 11. Therefore, during the insertion of the pole group 13 into the housing, the pole assembly does not contact the surface of the pole group 13, thus not hindering the movement of the pole group 13 and avoiding scratching the surface of the pole group 13. It can be understood that, as another alternative embodiment, the side of the inner connecting plate facing the inside of the shell 11 is higher than the inner wall of the shell 11, that is, the side of the inner connecting plate facing the inside of the shell 11 protrudes from the inner wall of the shell 11. In this case, it is convenient for processing and assembly of the pole assembly, and the thickness of the shell 11 can be avoided from being too thick. However, the size of the inner connecting plate protruding from the inner wall of the shell 11 is small, which can ensure that the pole group 13 enters the shell 11 smoothly, does not hinder the movement of the pole group 13, and does not scratch the surface of the pole group 13. Among them, the inner wall of the shell 11 refers to the wall surface of the side of the shell 11 facing the inside. It should be noted that after the pole assembly is assembled, the pole usually does not protrude from the surface of the inner connecting plate. Therefore, on the basis of ensuring that the inner connecting plate does not hinder the movement of the pole group 13 during the process of the pole group 13 entering the shell, it can be ensured that the entire pole assembly does not hinder the movement of the pole group 13.

[0076] In this embodiment, the height difference between the surface of the inner connecting plate facing the inside of the housing 11 and the inner surface of the housing 11 is 0 to 2 mm. Specifically, when the side of the inner connecting plate of the pole assembly facing the inside of the housing 11 is flush with the inner wall of the housing 11, the distance between the side of the inner connecting plate facing the inside of the housing 11 and the inner surface of the housing 11 is 0; when the side of the inner connecting plate facing the inside of the housing 11 is lower than the inner wall of the housing 11, the surface of the inner connecting plate facing the inside of the housing 11 is less than 2 mm below the inner surface of the housing 11. On the one hand, this prevents the wall of the housing 11 from being too thick, and on the other hand, it also facilitates the connection between the tab 130 of the pole group 13 and the pole assembly in the later stage; when the side of the inner connecting plate facing the inside of the housing 11 is higher than the inner wall of the housing 11, the surface of the inner connecting plate facing the inside of the housing 11 protrudes from the inner wall of the housing 11 by less than 2 mm. The small protrusion does not hinder the insertion of the pole group 13 into the housing. Preferably, the distance between the side of the inner connecting plate facing the inside of the housing 11 and the inner surface of the housing 11 is 0 to 1 mm. It should be noted that the space formed between the side of the inner connecting plate of the pole assembly facing the inside of the shell 11 and the shell 11 is suitable for the passage of the pole group 13. The pole assembly will not hinder the pole group 13, so that the pole group 13 can be smoothly installed in the shell 11, which is convenient for battery assembly.

[0077] In this embodiment, a first extension portion 201 is formed at each end of the second side surface 102 along the first direction. Figure 5 As shown, the cross-section of the battery in the xz plane of the rectangular coordinate system is trapezoidal. The battery has a structure with tabs on both sides. Each first extension 201 is provided with a terminal post assembly, and each terminal post assembly is connected to a terminal tab. Specifically, the terminal post assembly includes a positive terminal post assembly 107 and a negative terminal post assembly 108. The positive terminal post assembly 107 is provided on the first extension 201 at one end of the second side surface 102 along the first direction, and the negative terminal post assembly 108 is provided on the first extension 201 at the other end of the second side surface 102 along the first direction. The electrode group 13 has a positive terminal tab 1301 and a negative terminal tab 1302 provided at both ends. The positive terminal tab 1301 and the negative terminal tab 1302 are respectively extended from the two ends of the electrode group 13 along the x-axis direction of the rectangular coordinate system. The positive terminal post assembly 107 is electrically connected to the positive terminal tab 1301, and the negative terminal post assembly 108 is electrically connected to the negative terminal tab 1302. By forming a first extension portion 201 at each end of the second side surface 102 , it is convenient for the two tabs at both ends of the battery to be assembled and connected to the terminal assembly respectively, thereby further improving the reliability and convenience of assembly.

[0078] In this embodiment, the shell 11 also includes a third side surface 103 and a fourth side surface 104 that are relatively arranged. The first side surface 101, the third side surface 103, the second side surface 102 and the fourth side surface 104 are connected end to end in sequence, and the formed shell 11 is tubular, specifically a square aluminum tube; the third side surface 103 is an isosceles trapezoid, and the fourth side surface 104 is an isosceles trapezoid. The structure is symmetrical and easy to process. At this time, the cover plate 12 is in a flat plate shape. The cover plate 12 includes a first cover plate 121 and a second cover plate 122. The battery as a whole is a hexahedron. The first cover plate 121 is arranged at one end of the shell 11 with the positive electrode column assembly 107, the first cover plate 121 is the first end face 105 of the battery, and the second cover plate 122 is arranged at one end of the shell 11 with the negative electrode column assembly 108, and the second cover plate 122 is the second end face 106 of the battery. The first end face 105 and the second end face 106 are not parallel. The angle between the first end face 105 and the first side face 101 facing the interior of the shell 11 is greater than 90°, and the angle between the first end face 105 and the first side face 101 facing the interior of the shell 11 is less than 90°. The angle between the second end face 106 and the first side face 101 facing the interior of the shell 11 is greater than 90°, and the angle between the second end face 106 and the second side face 102 facing the interior of the shell 11 is less than 90°. The cover plate 12 is sealed and connected to the shell 11. During the assembly process, the cover plate 12 is buckled on the end of the shell 11, which is simple to operate.

[0079] Preferably, the two first extension portions 201 are symmetrically arranged, the first end face 105 and the second end face 106 are mirror-symmetrical, and the first end face 105 can be coincident with the second end face 106 by mirroring the yz plane of the rectangular coordinate system.

[0080] Specifically, the first side surface 101, the third side surface 103, the second side surface 102, and the fourth side surface 104 of the housing 11 are sequentially connected to form a tubular closed surface, while the first end surface 105 and the second end surface 106 are unclosed surfaces. The closed surface formed by the first side surface 101, the third side surface 103, the second side surface 102, and the fourth side surface 104 can be formed into a single piece by stretching, extrusion, bending, laser welding, or other forming methods.

[0081] Specifically, there are two cover plates 12, each with a wall thickness of 0.1 to 4 mm, preferably 1 to 3 mm. The cover plates 12 are made of aluminum or stainless steel. Preferably, the inner wall of the cover plate 12 contacts the housing 11 and is sealed together by laser welding or crimping. Furthermore, preferably, the inner wall of the cover plate 12 and the housing 11 have a stepped design that secures their relative position, improving positioning and connection stability.

[0082] Optionally, the yz cross-section of the housing 11 is square with a wall thickness of 0.1 mm to 2 mm. Specifically, the wall thickness of the first side 101 is equal to the wall thickness of the second side 102, and the wall thickness of the third side 103 is equal to the wall thickness of the fourth side 104. Preferably, the wall thickness of the first side 101 is equal to the wall thickness of the third side 103, specifically in the range of 0.2 mm to 1 mm. It is understood that, as an alternative embodiment, the wall thickness of the first side 101 and the wall thickness of the third side 103 may not be equal. Specifically, the wall thickness of the first side 101 is less than the wall thickness of the third side 103, with the difference between the two ranging from 0.1 mm to 0.5 mm, preferably 0.5 mm. It is understood that, as an alternative embodiment, the third side 103 and the fourth side 104 may also be curved surfaces, and the yz cross-section of the housing 11 may be an oblong.

[0083] Preferably, the third side surface 103 and the fourth side surface 104 are arranged in parallel; the angle between the first side surface 101 and the third side surface 103, and the angle between the first side surface 101 and the fourth side surface 104 are both 90°, the angle between the second side surface 102 and the third side surface 103, and the angle between the second side surface 102 and the fourth side surface 104 are both 90°, the angle between the first end surface 105 and the third side surface 103, and the angle between the first end surface 105 and the fourth side surface 104 are both 90°, and the angle between the second end surface 106 and the third side surface 103, and the angle between the second end surface 106 and the fourth side surface 104 are both 90°.

[0084] Specifically, if Figure 5 As shown, let the battery length be a, the length of the first side 101 be b, the length of the second side 102 be c, the left offset of the second side 102 relative to the first side 101 be d, and the right offset of the second side 102 relative to the first side 101 be e, which meets the following relationship:

[0085] a=c=b+d+e, where length refers to Figure 5 The “length direction” indicated by the middle arrow is the x-axis direction of the rectangular coordinate system; the left offset refers to the length of the second side surface 102 along the Figure 5 The "left" direction indicated by the middle arrow (also the negative direction of the x-axis) is longer than the dimension of the first side surface 101; the right offset refers to the dimension of the second side surface 102 along the Figure 5 The "right" direction indicated by the middle arrow (also the positive x-axis direction) is longer than the dimension of the first side 101. Preferably, d = e. Specifically, the positive electrode column assembly 107 is disposed on the second side 102 at an offset d to the left relative to the first side, and the negative electrode column assembly 108 is disposed on the second side 102 at an offset e to the right relative to the first side.

[0086] Specifically, the battery length a ranges from 300mm to 2500mm, preferably from 300mm to 1000mm; the left offset d ranges from 0 to 20mm, preferably from 5 to 10mm; and the right offset e ranges from 0 to 20mm, preferably from 5 to 10mm. Specifically, the battery thickness along the z-axis ranges from 10mm to 75mm, preferably from 15mm to 55mm; and the battery height along the y-axis ranges from 30mm to 300mm, preferably from 40mm to 200mm. In this embodiment, the battery is an isosceles trapezoidal battery with opposite-side tabs. The battery length is 600mm, of which the first side 101 is 580mm long and the second side 102 is 600mm long.

[0087] Specifically, the electrode assembly is disposed on the first extension 201. The electrode sequentially passes through the inner connecting plate, the first extension 201, and the outer connecting plate. The end of the electrode located inside the housing 11 is connected to the electrode tab 130, and the end located outside the housing 11 is suitable for connection to an external circuit. Specifically, the electrode assembly includes a positive electrode assembly 107 and a negative electrode assembly 108. The positive electrode assembly 107 includes a positive inner connecting plate 1071, a positive outer connecting plate 1077, and a positive electrode 1073. The negative electrode assembly 108 includes a negative inner connecting plate 1081, a negative outer connecting plate 1087, and a negative electrode 1083.

[0088] Preferably, the positive electrode inner connecting plate 1071 and the positive electrode outer connecting plate 1077 are made of aluminum; and the positive electrode column 1073 is made of aluminum.

[0089] Preferably, the negative electrode inner connecting plate 1081 is made of copper, and the negative electrode outer connecting plate 1087 is made of aluminum; the negative electrode column 1083 is a copper-aluminum composite material, wherein the end of the negative electrode column 1083 close to the negative electrode inner connecting plate 1081 is copper, and the end close to the negative electrode outer connecting plate 1087 is aluminum.

[0090] In this embodiment, the pole assembly further includes: an inner insulator, an inner seal, an outer seal, and an outer insulator. The inner insulator and the inner seal are disposed inside the housing 11 and between the inner connecting plate and the housing 11. The inner connecting plate abuts and insulated against the housing 11 via the inner insulator and the inner seal. The outer insulator and the outer seal are disposed outside the housing 11 and between the outer connecting plate and the housing 11. The outer connecting plate abuts and insulated against the housing 11 via the outer insulator and the outer seal. The inner connecting plate is insulated from the housing 11 by the inner insulator, and the outer connecting plate is insulated from the housing 11 by the outer insulator. The inner and outer insulators are plastic. Preferably, the inner and outer insulators are made of fluororubber, PP, PE, polytetrafluoroethylene, or bakelite. Specifically, the positive electrode column assembly also includes: a positive electrode inner insulating member 1072, a positive electrode inner seal 1074, a positive electrode outer seal 1075 and a positive electrode outer insulating member 1076; the negative electrode column assembly also includes: a negative electrode inner insulating member 1082, a negative electrode inner seal 1084, a negative electrode outer seal 1085 and a negative electrode outer insulating member 1086.

[0091] Preferably, the inner insulating member and the outer insulating member are made of fluororubber.

[0092] Preferably, a fuse 1078 is designed on the positive electrode inner connecting plate 1071. The fuse 1078 is an overcurrent fuse structure, which will melt when a large current flows through the battery to protect the battery circuit safety. Preferably, the cross-sectional area of ​​the fuse 1078 is 6mm 2 ~15mm 2 , preferably 6mm 2 .

[0093] Preferably, the outer connecting plate of the pole assembly protrudes from the outer wall of the shell 11 toward the outside of the shell 11, which facilitates the connection between batteries. When two adjacent batteries are stacked, the portion of the pole assembly protruding from the shell 11 is just located in the clearance space formed above the first end face 105 or the second end face 106 of the adjacent battery, which saves space and is conducive to protecting the pole assembly. Figure 1 The arrow in the middle points to the direction of "up".

[0094] In this embodiment, a groove with a through-hole is provided on the inner wall of the housing 11. The inner connecting plate is installed in the groove, and the pole is inserted into the through-hole. By providing the groove on the inner wall of the housing 11 and installing the inner connecting plate in the groove, the protrusion of the pole assembly on the inner wall of the housing 11 can be reduced, thereby preventing interference between the pole assembly and the pole group 13 during insertion into the housing, thus protecting the pole group 13. Furthermore, the groove provides a certain positioning and guidance for the installation of the inner connecting plate, facilitating assembly and improving assembly efficiency.

[0095] In this embodiment, the battery also includes a safety valve 109, which opens in the event of thermal runaway to expel high-temperature fumes and prevent explosion. Preferably, each of the two cover plates 12 is provided with a safety valve 109. Alternatively, one cover plate 12 may be provided with a safety valve 109 while the other is not. Alternatively, neither cover plate 12 may have a safety valve 109, with the safety valves 109 instead being provided on the third side 103 and / or fourth side 104 of the housing 11. This can also facilitate the expulsion of high-temperature fumes in the event of thermal runaway. It should be noted that the safety valve 109 opens at a certain pressure to provide explosion protection. The opening pressure of the safety valve 109 is 0.5 to 1.2 MPa. Alternatively, the safety valve 109 may be a notch or a bursting disc.

[0096] In this embodiment, the battery further includes one to two injection holes 110 , which are provided on the cover plate 12 or the housing 11 for injecting electrolyte into the battery.

[0097] Preferably, a reserved hole 143 is provided on the fixing bracket 14 at a position corresponding to the injection hole 110 , and the reserved hole 143 connects the injection hole 110 with the interior of the shell 11 , thereby ensuring smooth circulation of the electrolyte when the electrolyte is injected into the battery through the injection hole 110 .

[0098] Example 2

[0099] like Figures 12 to 13 As shown, the battery of Example 2 differs from Example 1 in the arrangement of the extensions and the appearance of the batteries. In this embodiment, at the first end of the housing 11 along the first direction, the second side surface 102 extends beyond the first side surface 101, and at the second end of the housing 11 along the first direction, the first side surface 101 extends beyond the second side surface 102. Correspondingly, a first extension 201 is formed on the second side surface 102 at the first end of the housing 11 along the first direction, and a second extension 202 is formed on the first side surface 101 at the second end of the housing 11 along the first direction. A terminal assembly is disposed on the second extension 202, and a terminal assembly is disposed on the first extension 201. Preferably, the second extension 202 is rotated 180° to overlap with the first extension 201. The first end and the second end are opposite ends of the housing 11 along the first direction.

[0100] The cross-section of the battery of this embodiment in the xz plane of a rectangular coordinate system is a parallelogram, and the battery is a hexahedron, with the electrode group 13 being the opposite-side output tab. Optionally, a negative electrode post assembly 108 is provided on the first extension 201, and a positive electrode post assembly 107 is provided on the second extension 202. That is, the positive electrode post assembly 107 is located on the first side 101 of the housing 11, and the negative electrode post assembly 108 is located on the second side 102. Correspondingly, after pre-welding, the positive electrode tab 1301 is offset to the side closer to the first side 101, and the negative electrode tab 1302 is offset to the side closer to the second side 102. After rotating 180°, the positive electrode tab 1301 overlaps with the negative electrode tab 1302.

[0101] In this embodiment, the third side surface 103 is a parallelogram, and the fourth side surface 104 is a parallelogram.

[0102] In this embodiment, the battery length a, the length b of the first side surface 101, the length c of the second side surface 102, the left offset d of the first side surface 101 relative to the second side surface 102, and the right offset e of the second side surface 102 relative to the first side surface 101 meet the following relationship:

[0103] a=c+d=b+e, where b=c.

[0104] Furthermore, when d=e, the above relationship can also be written as a=c+e=b+d.

[0105] In this embodiment, the length of the battery is 600 mm, the length of the first side surface 101 is 590 mm, and the length of the second side surface 102 is 590 mm.

[0106] Example 3

[0107] like Figures 14 to 17 As shown, the battery of Example 3 differs from that of Example 1 in the arrangement of the extension portion at the end of the battery and the battery's appearance. In this embodiment, at the first end of the shell 11 along the first direction, the second side surface 102 extends beyond the first side surface 101, forming a first extension portion 201. Furthermore, at the second end of the shell 11 along the first direction, the first side surface 101 and the second side surface 102 are flush. A first cover plate 121 perpendicular to both the first side surface 101 and the second side surface 102 is provided at the second end of the shell 11 along the first direction. A pole assembly is provided on the first extension portion 201, and another pole assembly is provided directly on the first cover plate 121. Specifically, the tab 130 connected to one pole assembly provided on the first extension portion 201 is not bent, while the tab 130 connected to the pole assembly on the first cover plate 121 needs to be bent.

[0108] The cross-section of the battery of this embodiment in the xz plane of the rectangular coordinate system is a right-angled trapezoid, and the battery is a hexahedron, with the electrode group 13 as the opposite-side output tab. Optionally, the positive electrode column assembly 107 is disposed on the first cover plate 121, and the negative electrode column assembly 108 is disposed on the first extension 201 of the second side surface 102. Preferably, the safety valve 109 is disposed on the second cover plate 122; the injection port 110 is disposed on the second side surface 102. The stacking method of the electrode group 13 and the lead-out position of the tab 130 are the same as those in Example 1. The pre-welding position of the positive tab 1301 needs to be adjusted according to the thickness of the positive electrode column and the battery. After pre-welding, the negative tab 1302 is offset to the side of the second side surface 102 close to the shell 11.

[0109] In this embodiment, the third side surface 103 is in the shape of a right-angled trapezoid, and the fourth side surface 104 is in the shape of a right-angled trapezoid.

[0110] In this embodiment, the battery length a, the length b of the first side surface 101, the length c of the second side surface 102, the left offset d of the first side surface 101 relative to the second side surface 102, and the right offset e of the second side surface 102 relative to the first side surface 101 meet the following relationship:

[0111] a=c=b+e, where b <c,d=0。

[0112] In this embodiment, the length of the battery is 600 mm, the length of the first side surface 101 is 590 mm, and the length of the second side surface 102 is 600 mm.

[0113] Example 4

[0114] like Figures 18 to 19 As shown, the difference between the battery of Example 4 and the battery of Example 1 lies in that the shape of the third side 103 and the fourth side 104 are different from those of Example 1, and the shape of the cover 12 is different from that of Example 1. Specifically, the shape of the third side 103 and the fourth side 104 is a combination of a rectangle and an isosceles trapezoid, specifically a combination of a rectangle close to the second side 102 and an isosceles trapezoid close to the first side. Correspondingly, the cover 12 includes two surfaces set at an obtuse angle. The cover 12 is constructed into a bent shape that matches the edges of the third side 103 and the fourth side 104. The angle between the cover 12 and the first side 101 toward the inner side of the shell 11 is greater than 90°, and the angle between the cover 12 and the second side 102 is 90°.

[0115] The cross section of the battery of this embodiment in the xz plane of the rectangular coordinate system is hexagonal, and the battery is octahedral.

[0116] In this embodiment, the length of the battery is 600 mm, the length of the first side surface 101 is 580 mm, and the length of the second side surface 102 is 590 mm.

[0117] Example 5

[0118] like Figures 20 to 21 As shown, the difference between the battery of Example 5 and the battery of Example 2 lies in that the shape of the third side 103 and the fourth side 104 are different from those of Example 2, and the shape of the cover 12 is different from that of Example 2. Specifically, the third side 103 and the fourth side 104 are a combination of a rectangle and two right-angled trapezoids. Correspondingly, the cover 12 is composed of two surfaces set at an obtuse angle. The cover 12 is constructed into a bent shape that matches the edges of the third side 103 and the fourth side 104. The angle between the cover 12 and the first side 101 facing the inner side of the shell 11 is not 90°, and the angle with the second side 102 is 90°.

[0119] The cross section of the battery of this embodiment in the xz plane of the rectangular coordinate system is hexagonal, and the battery is octahedral.

[0120] In this embodiment, the length of the battery is 600 mm, the length of the first side surface 101 is 590 mm, and the length of the second side surface 102 is 590 mm.

[0121] Example 6

[0122] like Figures 22 to 25 As shown, the difference between the battery of Example 6 and Example 3 is that the shape of the third side 103 and the fourth side 104 are different from those of Example 3, and the shape of the second cover 122 is different from that of Example 3. Specifically, the third side 103 and the fourth side 104 are a combination of a rectangle and a right-angled trapezoid. Correspondingly, the second cover 122 is composed of two surfaces set at an obtuse angle. The cover 12 is constructed into a bent shape that matches the edges of the third side 103 and the fourth side 104. The angle between the second cover 122 and the first side 101 toward the inner side of the shell 11 is not 90°, and the angle with the second side 102 is 90°.

[0123] The cross section of the battery of this embodiment in the xz plane of the rectangular coordinate system is a pentagon, and the battery is a heptahedron.

[0124] In this embodiment, the length of the battery is 600 mm, the length of the first side surface 101 is 590 mm, and the length of the second side surface 102 is 600 mm.

[0125] Example 7

[0126] like Figures 26 to 34As shown, the difference between the battery of Example 7 and the battery of Example 1 is that the battery of Example 7 is a battery with the tabs on the same side, the second side surface 102 at one end of the shell 11 along the first direction has an extra portion relative to the first side surface 101, forming a first extension portion 201, the other end of the shell 11 along the first direction is a closed end and the first side surface 101 is flush with the second side surface 102, the positive column assembly 107 and the negative column assembly 108 are both arranged on the first extension portion 201, and the shell 11 has only one end with the first extension portion 201 as an open end, and a cover plate 12 is provided at the open end, and the number of cover plates 12 is one. Among them, the first direction refers to Figure 29 The “first direction” indicated by the arrow is the x-axis direction in the rectangular coordinate system.

[0127] The cross section of the battery of this embodiment in the xz plane of the rectangular coordinate system is a right-angled trapezoid, the battery is a hexahedron, and the electrode group 13 has the electrode ears on the same side.

[0128] In this embodiment, the battery length a, the length b of the first side surface 101, the length c of the second side surface 102, the left offset d of the first side surface 101 relative to the second side surface 102, and the right offset e of the second side surface 102 relative to the first side surface 101 meet the following relationship:

[0129] a=c=b+e, where b <c,d=0。

[0130] Specifically, the value range of a and / or c (the size of the battery along the x-axis) is 30mm to 350mm, preferably 40mm to 120mm; the value range of e is 0 to 20mm, preferably 5 to 10mm; the value range of the size of the battery along the z-axis is 10mm to 100mm, preferably 15mm to 75mm; the value range of the size of the battery along the y-axis is 50mm to 400mm, preferably in the range of 100mm to 300mm.

[0131] Example 8

[0132] like Figures 35 to 36 As shown, the difference between the battery of Example 8 and the battery of Example 7 is that the shapes of the third side surface 103 and the fourth side surface 104 are different from those of Example 3. Specifically, the shapes of the third side surface 103 and the fourth side surface 104 are a combination of a rectangle and a right-angled trapezoid. Correspondingly, the cover plate 12 is composed of two surfaces set at an obtuse angle. The cover plate 12 is constructed into a bent shape that matches the edges of the third side surface 103 and the fourth side surface 104. The angle between the cover plate 12 and the first side surface 101 toward the inner side of the shell 11 is not 90°, and the angle with the second side surface 102 is 90°.

[0133] It can be understood that, as an alternative embodiment, the third side surface 103 and the fourth side surface 104 may also be in a stepped shape or a combination of a rectangle and other shapes.

[0134] Eight embodiments of the battery assembly method are described below:

[0135] Example 1

[0136] The battery assembly method of this embodiment is used to assemble the battery of embodiment 1, and the battery assembly method includes:

[0137] Step S101: preparing an electrode group 13.

[0138] Specifically, the prepared positive electrode sheet 131 , negative electrode sheet 132 , and separator 133 are assembled into the electrode group 13 by lamination and fixed with tape 134 .

[0139] Step S102 : pre-welding the tabs 130 of the electrode group 13 , ie, pre-welding the tabs.

[0140] Specifically, the multiple layers of tabs of the positive electrode sheet are pre-welded together to form a positive electrode tab 1301, and the multiple layers of tabs of the negative electrode sheet are pre-welded together to form a negative electrode tab 1302. Preferably, the positive electrode tab 1301 and the negative electrode tab 1302 are pre-welded and offset to one side of the electrode assembly 13 close to the second side surface 102 of the housing 11. Ultrasonic welding is preferably used for pre-welding.

[0141] Step S103: cutting the pre-welded tab 130 , ie, tab cutting.

[0142] Specifically, the ends of the positive electrode tab 1301 and the negative electrode tab 1302 are trimmed neatly.

[0143] Step S104 : coating the electrode assembly, i.e., electrode assembly coating. Specifically, the coating material is an insulating film 135 or an insulating tape 136 , which ensures insulation between the electrode assembly and the housing 11 and protects the electrode assembly 13 .

[0144] Step S105: Push the coated electrode assembly into the shell 11 from the open end of the shell 11, that is, the electrode assembly is put into the shell.

[0145] Specifically, the electrode group 13 is pushed into a designated position in the housing 11 along the length direction of the battery. The electrode column assembly does not hinder the advancement of the electrode group 13, is easy to install, and helps protect the electrode group 13 from damage.

[0146] Step S106: welding the electrode tab 130 to the electrode of the electrode assembly.

[0147] Specifically, the positive electrode tab 1301 is welded to the positive electrode post assembly 107, and the negative electrode tab 1302 is welded to the negative electrode post assembly 108. Because the post is positioned on the extension, there is no housing 11 blocking the upper portion of the extension. This facilitates operation and observation of the welding of the tabs 130 and the post. Furthermore, the tabs 130 do not need to be bent, resulting in a reliable connection and high efficiency. The upper portion of the extension refers to the position on the first side 101 opposite the second side 102 along the z-axis of the rectangular coordinate system.

[0148] Step S107 : welding the cover plate 12 to the housing 11 .

[0149] Specifically, a first cover plate 121 is installed at the positive end of the battery and welded to the housing 11, and a second cover plate 122 is installed at the negative end of the battery and welded to the housing 11. Preferably, the welding method between the cover plate 12 and the housing 11 is laser welding.

[0150] In this embodiment, the battery further includes a fixing bracket 14, which is installed between the electrode group 13 and the cover plate 12. Preferably, the fixing bracket 14 is fixed to the electrode group 13 before the electrode group is placed in the shell. Then, the electrode group assembly in the above step S104 is a combination of the electrode group 13 and the fixing bracket 14. The above step S104 specifically comprises: wrapping the fixing bracket 14 and the electrode group 13 together to fix the fixing bracket 14 to the electrode group 13. It should be noted that during the wrapping process, the four surfaces of the electrode group 13 without electrode tabs and the fixing bracket 14 are wrapped with an insulating film 135 or an insulating tape 136 to ensure that the electrode group 13 is insulated from the shell 11. It can be understood that, as an alternative embodiment, the electrode group assembly only includes the electrode group 13, and the fixing bracket 14 and the electrode group 13 are separately installed in the shell 11. Then, after the above step S105, the following steps are further included: Step S108: placing the fixing bracket 14 into the shell 11 and abutting against the electrode group 13. Specifically, a fixing bracket 14 is placed at the positive terminal and the negative terminal of the battery respectively.

[0151] In this embodiment, the following steps are further included after the above-mentioned S101:

[0152] Step S109: Hot pressing the electrode assembly. Specifically, hot pressing or cold pressing is used to tightly bond the positive electrode sheet 131, negative electrode sheet 132, and separator 133 in the electrode assembly 13 together, improving the quality of the electrode assembly 13. When hot pressing is used, the hot pressing temperature is 50-120°C, the pre-pressing time is 1-30 seconds, and the pressure is 1-8 MPa. When cold pressing is used, the pre-pressing time is 1-30 seconds and the pressure is 1-8 MPa.

[0153] In this embodiment, the pole group assembly includes an inner connecting plate, an outer connecting plate and a pole, and the pole assembly is assembled with the housing 11 in advance. Specifically, before the above-mentioned step S105, the following steps are also included:

[0154] Step S201 : placing the inner connecting plate inside the housing 11 . Specifically, the inner connecting plate is placed in a groove on the side surface of the housing 11 , and the inner connecting plate is located inside the housing 11 .

[0155] Step S202 : placing the outer connecting plate outside the housing 11 and opposite to the inner connecting plate. Specifically, the outer connecting plate is located on the side of the groove away from the interior of the housing 11 , that is, the outer connecting plate is located outside the housing 11 .

[0156] Step S203: The poles are sequentially passed through the inner connecting plate, the housing 11, and the outer connecting plate, and fixed. Specifically, the poles are passed through the through holes of the grooves on the housing 11. The poles pass through the housing 11, that is, the poles pass through the through holes, and the inner and outer connecting plates are fixedly connected to the housing 11 through the poles.

[0157] Specifically, there are two grooves, and each of the two grooves corresponds to a pole assembly, namely a positive pole assembly 107 and a negative pole assembly 108 .

[0158] The battery assembly method of this embodiment is applied, by first pushing the electrode group 13 into the shell 11 from the open end of the shell 11, and then welding the pole lug 130 to the pole post assembly. Since the pole post assembly is arranged on the side of the shell 11, after the electrode group 13 is placed in the shell 11, the pole lug 130 can be directly welded to the pole of the pole post assembly without bending. In addition, there is no side cover of the shell 11 above the pole post assembly, and it is convenient to directly observe whether the installation of the pole lug 130 is in place and the status of the pole lug 130 from the opening above the pole post assembly, avoiding the problem of loose connection caused by the traditional pole lug 130 needing to be bent before being welded to the pole and the bending status cannot be directly observed and controlled.

[0159] Example 2

[0160] The battery assembly method of this embodiment is used to assemble the battery of Example 2, and has the same steps as the battery assembly method of Example 1. The only difference is that the pre-welding of the tabs, the cutting of the tabs, the welding of the tabs and the pole assembly, the placement of the fixing bracket 14, and the welding of the cover plate 12 and the shell 11 require adjustment of the pole group 13 and the battery positioning according to the actual position of the pole.

[0161] Example 3

[0162] The battery assembly method of this embodiment is used to assemble the battery of the third embodiment. Steps S101 to S105 and steps S107 to S109 of the battery assembly method of this embodiment are the same as those of the battery assembly method of the first embodiment. The difference is that the battery assembly method of this embodiment further includes the following steps after step S106:

[0163] Step S301: Welding the second cover plate 122 to the housing 11. Specifically, one end of the housing 11 provided with the first extension portion 201 is placed into the second cover plate 122 and welded to seal.

[0164] Step S302: Welding the first cover plate 121 to the housing 11. Specifically, first bend the positive electrode tab 1301, then press the first cover plate 121 and the housing 11 together, and weld them to seal.

[0165] Example 4

[0166] The battery assembly method of this embodiment is used to assemble the battery of the fourth embodiment, and has the same steps as the battery assembly method of the first embodiment.

[0167] Example 5

[0168] The battery assembly method of this embodiment is used to assemble the battery of the fifth embodiment, and has the same steps as the battery assembly method of the second embodiment.

[0169] Example 6

[0170] The battery assembly method of this embodiment is used to assemble the battery of the sixth embodiment, and has the same steps as the battery assembly method of the third embodiment.

[0171] Example 7

[0172] The battery assembly method of this embodiment is used to assemble the battery of the seventh embodiment. The difference from the battery assembly method of the first embodiment is that in the battery assembly method of this embodiment, only one cover plate 12 needs to be welded in step S107.

[0173] Example 8

[0174] The battery assembly method of this embodiment is used to assemble the battery of embodiment 8, which is the same as the battery assembly method of embodiment 7.

[0175] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0176] The problems of tab bending and long peripheral sealing paths are effectively avoided.

[0177] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A battery, characterized in that: include: A shell (11) comprises a first side surface (101), a third side surface (103), a second side surface (102), and a fourth side surface (104) connected end to end in sequence, wherein the areas of the first side surface (101) and the second side surface (102) are larger than the areas of the third side surface (103) and the fourth side surface (104), and at least one side surface with a relatively larger area extends outward from its inner wall in a direction away from the interior of the shell (11) to form a groove with a through hole; At least one pole assembly is arranged corresponding to the groove, the pole assembly comprises an inner connecting plate, an outer connecting plate and a pole, the inner connecting plate is arranged on the inner side of the shell (11), the outer connecting plate is arranged on the outer side of the shell (11), and the pole passes through the inner connecting plate, the shell (11) and the outer connecting plate in sequence; A pole group (13) is arranged in the housing (11), the pole group (13) has pole ears (130) equal in number to the pole column assemblies, the pole ears (130) correspond to the pole column assemblies one-to-one and are electrically connected, and a space formed between a side of the pole column assembly facing the interior of the housing (11) and the housing (11) is suitable for the pole group (13) to pass through; a cover plate (12) disposed at at least one end of the housing (11) along a first direction to close the housing (11); The first side surface (101) and the second side surface (102) are arranged opposite to and in parallel, and at least one end of at least one of the first side surface (101) and the second side surface (102) extends beyond a portion relative to its opposite surface along the first direction to form an extension portion, and the groove is arranged on the extension portion.

2. The battery according to claim 1, characterized in that Also includes: A fixing bracket (14) is provided between the pole group (13) and the cover plate (12), one side of the fixing bracket (14) abuts against the pole group (13) and the other side abuts against the cover plate (12).

3. The battery according to claim 1, characterized in that The inner connecting plate is installed in the groove, the outer connecting plate is installed on a side of the groove away from the interior of the housing (11), and the pole is passed through the through hole.

4. The battery according to claim 1, characterized in that The side of the inner connecting plate facing the interior of the shell (11) is flush with the inner wall of the shell (11), or the side of the inner connecting plate facing the interior of the shell (11) is lower than the inner wall of the shell (11), or the side of the inner connecting plate facing the interior of the shell (11) is higher than the inner wall of the shell (11).

5. The battery according to claim 4, characterized in that The height difference between the surface of the inner connecting plate facing the interior of the shell (11) and the inner surface of the shell (11) is 0 to 2 mm.

6. The battery according to claim 1, characterized in that The third side surface (103) and the fourth side surface (104) are parallelogram-shaped, trapezoidal-shaped, rectangular-shaped, or stepped-shaped.

7. A battery assembly method, characterized in that: The battery assembly method is used to assemble the battery according to any one of claims 1 to 6, and the battery assembly method comprises: preparing a pole group (13); Pre-welding the pole lugs (130) of the pole group (13); cutting the pre-welded tab (130); Coating the electrode assembly; Pushing the coated electrode assembly into the housing (11) from the open end of the housing (11); Welding the pole lug (130) to a pole of a pole assembly provided on the housing (11); The cover plate (12) is welded to the housing (11).

8. The battery assembly method according to claim 7, characterized in that: The battery further comprises a fixing bracket (14), wherein the fixing bracket (14) is installed between the electrode group (13) and the cover plate (12). The electrode group assembly comprises the electrode group (13) and the fixing bracket (14), and the coating of the electrode group assembly comprises: coating the fixing bracket (14) and the electrode group (13) together to fix the fixing bracket (14) and the electrode group (13); Alternatively, the pole group assembly is the pole group (13), and the coating of the pole group assembly comprises: coating the pole group (13), and after welding the pole lug (130) and the pole column assembly, further comprising: placing a fixing bracket (14) into the housing (11) and abutting against the pole group.

9. The battery assembly method according to claim 7, wherein: The electrode group assembly comprises an inner connecting plate, an outer connecting plate and a pole, and before the coated electrode group assembly is pushed into the shell (11) from the open end of the shell (11), the method further comprises: Placing the inner connecting plate on the inner side of the housing (11); placing the outer connecting plate outside the housing (11) and opposite to the inner connecting plate; The pole is sequentially passed through the inner connecting plate, the shell (11) and the outer connecting plate and fixed.

Images