Battery Module

Abstract

To provide a battery module capable of reliably and stably connecting a battery cell and a lead plate while being efficiently mass-produced.SOLUTION: A battery module includes a plurality of battery cells 1, a lead plate 3 welded to an electrode of each battery cell 1, and a cell holder 2 joining the battery cells 1 and the lead plate 3. The cell holder 2 includes a position restriction stopper 24 arranging the lead plate 3 in a fixed position. The lead plate 3 includes an elastic arm part 35 elastically pressing the cell holder 2, and a collision part 34 that is energized by a reaction of pressing by the elastic arm part 35, and comes into contact with the position restriction stopper 24. The lead plate 3 is further arranged in the cell holder 2 in a freely displaceable manner in a direction in which the collision part 34 approaches the position restriction stopper 24. In the battery module, the lead plate 3 is displaced by a reaction pressing the cell holder 2 by the elastic arm part 35, the collision part 34 of the lead plate 3 comes into contact with the position restriction stopper 24, and thereby the lead plate 3 is arranged in the fixed position of the cell holder 2.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a battery module in which a plurality of battery cells are connected in series or in parallel by lead plates. [Background technology]

[0002] A battery module has been developed in which multiple battery cells are positioned in fixed positions using cell holders, and lead plates are welded to the positive and negative electrodes of each battery cell (see Patent Document 1). In this battery module, both the battery cells and the lead plates are positioned in fixed positions using the cell holder, and the connection leads of the lead plates are welded to the battery cell electrodes. In this battery module, the lead plates are positioned in fixed positions in the cell holder using an interlocking structure, and the connection leads are positioned opposite the positive and negative electrodes of the battery cells. The connection leads positioned opposite the battery cell electrodes can be welded by contacting them with the electrode surfaces in a pressed state. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2021 / 111842 [Patent Document 2] Special Publication No. 2016-516273 Summary of the Invention [Problem to be solved by the invention]

[0004] In a structure in which both the battery cell and the lead plates are fitted into the cell holder to position the battery cell electrodes and the connection leads are welded to the battery cell electrodes, the battery cell electrodes and the welded portions of the connection leads must be positioned precisely opposite each other during the welding process. In particular, battery modules have been developed in which lead plates are fitted to only one end face of the battery cell. However, because these battery modules connect positive and negative connection leads to one end face of the battery cell, the lead plates and the battery electrodes must be positioned relative to each other with extremely high precision (see Patent Document 2). However, in a structure in which the battery cell and the lead plates are fitted into the cell holder to position the battery cells in fixed positions, it is extremely difficult to position them relative to each other with high precision during the actual manufacturing process. This is because errors in the cell holder molding process, errors in the battery cell manufacturing process, errors in the lead plate cutting process, and other errors can cause misalignment between the welded portions and the electrodes. While increasing the dimensional accuracy of the cell holder, battery cells, and lead plates can reduce the relative positional misalignment between the welded parts and the electrodes, increasing the dimensional accuracy of each part has drawbacks such as higher manufacturing costs due to the need for higher processing accuracy and lower yields. Furthermore, in a battery module, reliably and stably welding the lead plates to the electrodes is an extremely important characteristic, as it ensures the reliability and stability of the battery module itself.

[0005] The present invention was developed with the objective of further resolving the above-mentioned problems, and one object of the present invention is to provide a battery module that can be mass-produced efficiently and that can reliably and stably connect battery cells and lead plates. [Means for solving the problem]

[0006] A battery module according to one embodiment of the present invention includes a plurality of battery cells, lead plates formed by welding connection leads to the electrodes of the battery cells, and a cell holder formed by connecting the battery cells to the lead plates. The cell holder includes a positioning stopper that positions the lead plate in a fixed position, and the lead plate includes an elastic arm portion that elastically presses the cell holder and a collision portion that is urged by the reaction of the elastic arm portion pressing against the cell holder and abuts against the positioning stopper. Furthermore, the lead plate is disposed on the cell holder so as to be displaceable in a direction that brings the collision portion closer to the positioning stopper. In the battery module, the lead plate is displaced by the reaction of the elastic arm portion pressing against the cell holder, and the collision portion of the lead plate abuts against the positioning stopper, positioning the lead plate in the fixed position in the cell holder. [Effects of the Invention]

[0007] The object of the present invention is to provide a battery module that can be mass-produced efficiently and that can reliably and stably connect the battery cells and lead plates. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic exploded perspective view of a battery module according to an embodiment of the present invention; [Figure 2] FIG. 2 is an exploded perspective view showing the connection structure between the cell holder, the lead plate, and the battery cell. [Figure 3] FIG. 2 is a plan view showing a positioning structure for a cell holder and a lead plate. [Figure 4] FIG. 2 is a perspective view showing a positioning structure for a cell holder and a lead plate. [Figure 5] FIG. 2 is a cross-sectional perspective view showing a positioning structure for a cell holder and a lead plate. [Figure 6] FIG. 2 is a plan view showing the connection state between the lead plates and the battery cells. [Figure 7] FIG. 4 is an enlarged plan view showing the connection state between the first connection lead and the peripheral electrode. [Figure 8] FIG. 10 is a plan view showing a positioning structure for a cell holder and a lead plate according to a modified example. [Figure 9] 10 is a partially enlarged plan view showing a lead-plate positioning structure for a battery module according to another embodiment of the present invention. FIG. [Figure 10] 10 is a partially enlarged plan view showing a lead-plate positioning structure for a battery module according to another embodiment of the present invention. FIG. [Figure 11] 10 is a partially enlarged plan view showing a lead-plate positioning structure for a battery module according to another embodiment of the present invention. FIG. [Figure 12] 10 is a partially enlarged plan view showing a lead-plate positioning structure for a battery module according to another embodiment of the present invention. FIG. [Figure 13] FIG. 10 is a schematic exploded perspective view of a battery module according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] A battery module according to one embodiment of the present invention includes a plurality of battery cells, lead plates formed by welding connection leads to the electrodes of the battery cells, and cell holders formed by connecting the battery cells and the lead plates, the cell holders having positioning stops that position the lead plates, and the lead plates having elastic arms that elastically press the cell holder and collision parts that are urged by the reaction of the elastic arms pressing the cell holder and abut against the positioning stops. The lead plates are disposed on the cell holder so as to be displaceable in a direction that brings the collision parts closer to the positioning stops. In the battery module, the lead plates are displaced by the reaction of the elastic arms pressing the cell holder, and the collision parts of the lead plates abut against the positioning stops, positioning the lead plates in the cell holder. The cell holder and the lead plate are connected via a connecting mechanism that can displace the relative positions of the two in a direction that brings the collision part closer to the position-regulating stopper. The connecting mechanism has a connecting hole provided in the lead plate and an insertion boss provided in the cell holder and inserted into the connecting hole, and a displacement gap is provided between the connecting hole and the insertion boss in a direction that brings the collision part closer to the position-regulating stopper.

[0010] The above battery module allows the connection leads of the lead plates to be welded to the battery cell electrodes while the lead plates are connected in a fixed position to the cell holder. In particular, it has the advantage of absorbing errors that may occur during the manufacturing processes for the battery cells, cell holders, and lead plates, positioning the lead plates and battery cells in fixed positions, and reliably welding the connection leads to the battery cell electrodes. This is because the above battery module presses the cell holder with the elastic arm portions on the lead plates, bringing the impact portions of the lead plates into contact with the cell holder positioning stoppers, eliminating any relative positional misalignment between the lead plates and the cell holders when connecting them.

[0011] Reliable and stable welding of the lead plate's connection leads to the battery cell electrodes is extremely important in battery modules. Reliable welding of the lead plate and battery cell can be achieved by accurately positioning the lead plate's connection leads and the battery cell electrodes facing each other. Lead plates are welded to battery cell electrodes using methods such as laser welding, spot welding, and ultrasonic welding. However, misalignment between the connection leads and the electrodes can hinder reliable welding and cause problems such as the connection leads contacting unconnected electrodes. Relative misalignment can be achieved by increasing the processing precision of the battery cells, cell holders, and lead plates. However, improving the processing precision of these components is extremely difficult in actual manufacturing processes and further increases manufacturing costs. Therefore, mass-produced battery modules require a structure that reliably welds the lead plates to the electrodes while minimizing manufacturing costs.

[0012] In a battery module according to another embodiment of the present invention, the cell holders and the lead plates can be connected via a connecting mechanism that can displace the relative positions of the two in a direction that brings the collision portion closer to the position restricting stopper.

[0013] The above battery module has a connecting mechanism that connects the lead plates and cell holders in a displaceable state, and the lead plates are positioned in a fixed position on the cell holder by the reaction force of the elastic arm portion pressing against the cell holder.This has the advantage that by connecting the lead plates and cell holders, it can be mass-produced efficiently while reducing assembly costs.

[0014] In a battery module according to another embodiment of the present invention, the connecting mechanism includes connecting holes formed in the lead plates and insertion bosses formed in the cell holders and inserted into the connecting holes, and a displacement gap can be provided between the connecting holes and the insertion bosses in a direction that moves the collision portion closer to the position restriction stopper.The above battery module has a feature that the lead plates and cell holders can be connected to each other with freedom of displacement in a predetermined direction using a simple structure in which the insertion bosses of the cell holders are inserted into the connecting holes of the lead plates.

[0015] In a battery module according to another embodiment of the present invention, the position restriction stoppers may be rib-shaped and protrude from the surface of the cell holder, and the collision portion may be used as a cutting line for the lead plate.

[0016] The above battery module has the advantage that the lead plate can be accurately connected to the cell holder with a simple structure in which the cell holder positioning stopper is rib-shaped and the cutting line of the lead plate is pressed against it. In particular, the above battery module uses the positioning stopper as a rib and the cutting line of the lead plate is pressed against it as a collision part to position the two in a fixed position, so there is no need to process the lead plate into a special shape to provide a protrusion, and lead plates that can be connected to the cell holder in a fixed position can be mass-produced inexpensively, reducing manufacturing costs. Furthermore, because the cutting line of the lead plate is pressed against the rib-shaped positioning stopper to position the two in a fixed position, there is the advantage that both can be positioned more accurately without deforming the collision part of the lead plate that is pressed against the cell holder positioning stopper.

[0017] A battery module according to another embodiment of the present invention is a cylindrical battery in which the battery cells have a central electrode in the center and a peripheral electrode on the outer periphery of the electrode end face, and the lead plate can include a first connection lead welded to the peripheral electrode of the battery cell and a second connection lead welded to the central electrode of the battery cell.

[0018] In the battery module described above, both the first and second connection leads are welded to one end surface of the cylindrical battery, eliminating the need to connect lead plates to the bottom of the battery cells. This structure is effective in miniaturizing the battery module. Furthermore, a structure in which both the first and second connection leads are welded to one end surface requires high precision, especially in the welding position of the first connection lead. This is because the peripheral electrode is narrow and the central electrode is located even closer. Misalignment of the welding position of the first connection lead prevents reliable welding of the connection lead, and if it comes into contact with the central electrode, it can cause a short circuit. The above structure, in which the lead plate and cell holder are positioned with high precision and the first connection lead is welded to the peripheral electrode, not only ensures stable welding, but also reliably prevents short circuits due to contact with the central electrode.

[0019] In a battery module according to another embodiment of the present invention, the first connection lead of the lead plate is arm-shaped and extends tangentially to the peripheral electrode of the cylindrical battery, and the lead plate can be biased so that the first connection lead is displaced toward the center of the cylindrical battery.

[0020] In another embodiment of the battery module of the present invention, the collision portion is a cutting line formed by cutting a metal plate in a straight line, the position control stopper is rib-shaped and arranged parallel to the cutting line of the collision portion, and the first connection lead of the lead plate can be arm-shaped and extending in a direction parallel to the cutting line of the collision portion and the position control stopper.

[0021] A battery module according to another embodiment of the present invention can have a structure in which the lead plate has a bridge plate-like portion between the first connection lead and the collision portion, and has a slit between the bridge plate-like portion and the first connection lead, the edge of the bridge plate-like portion facing the position control stopper is the cutting line of the collision portion, the cutting line of the collision portion and the first connection lead are arranged in a parallel position to each other, and the first connection lead extends in the tangential direction of the peripheral electrode and is welded to the peripheral electrode.

[0022] The battery module described above has the advantage that the first connection lead can be positioned in a fixed position on the peripheral electrode with high precision and without misalignment, allowing it to be reliably welded without misalignment. This is because the lead plate has one side edge of the bridge plate portion as a cutting line, and the first connection lead is positioned on the other side edge via a slit, allowing the first connection lead to be positioned close to the cutting line. The first connection lead, which is positioned close to the cutting line that accurately positions the lead plate, is positioned in a fixed position by the cutting line, allowing it to be welded to the peripheral electrode without misalignment.

[0023] In a battery module according to another embodiment of the present invention, the width of the bridge plate portion can be set to 20 mm or less.

[0024] In a battery module according to another embodiment of the present invention, the collision portion of the lead plate can be disposed at the base of the first connection lead. This battery module has the advantage that the first connection lead can be accurately positioned at the collision portion, preventing misalignment relative to the peripheral electrode and ensuring reliable welding. This is because the collision portion of the lead plate is disposed at the base of the rear end of the first connection lead, which is close to the welding portion.

[0025] In a battery module according to another embodiment of the present invention, the lead-plates can be metal plates in which first connection leads extending in the tangential direction of the cylindrical batteries are provided integrally with the lead-plate bodies.

[0026] In a battery module according to another embodiment of the present invention, the lead plates can be provided so that the first connection lead and the second connection lead are perpendicular to each other.

[0027] In a battery module according to another embodiment of the present invention, the lead-plate may include a plurality of elastic arms spaced apart in the width direction of the lead-plate. This battery module has the advantage that each elastic arm presses against the cell holder, allowing the lead-plate to move in parallel.

[0028] In a battery module according to another embodiment of the present invention, the lead-plate may have a plurality of collision portions spaced apart in the width direction of the lead-plate. The above-described battery module has the advantage that the entire lead-plate can be positioned in a fixed position.

[0029] In a battery module according to another embodiment of the present invention, the positioning stoppers can be rib-shaped and protrude from the surface of the cell holder as an integral part. The above battery module has the advantage that the lead plates can be connected to the cell holder in accurate positions with a simple structure in which the cell holder positioning stoppers are rib-shaped and the lead plates are pressed against them.

[0030] In a battery module according to another embodiment of the present invention, the opposing edges of the position restriction stopper and the collision portion may extend in a direction intersecting the pressing direction of the elastic arm portion.

[0031] Specific examples of the present invention will be described in detail below with reference to the drawings. In the following description, terms indicating specific directions or positions (e.g., "upper," "lower," and other terms incorporating these terms) will be used as necessary. However, the use of these terms is intended to facilitate understanding of the invention with reference to the drawings, and the meaning of these terms does not limit the technical scope of the present invention. Furthermore, parts with the same reference numerals appearing in multiple drawings indicate the same or equivalent parts or components. Furthermore, the embodiments described below are illustrative examples of the technical concept of the present invention and do not limit the scope of the present invention to the following. Furthermore, unless otherwise specified, the dimensions, materials, shapes, relative positions, etc. of the components described below are intended for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, the content described in one embodiment or example may also be applicable to other embodiments or examples. Furthermore, the sizes and positional relationships of components shown in the drawings may be exaggerated for clarity.

[0032] The battery module of the present invention is primarily suitable as an emergency power source, a power source for supplying power to the motor of an electric vehicle, etc. However, the present invention does not specify the use of the battery module, and it can also be used as a power source for various other electrical devices.

[0033] (Embodiment 1) In the battery module 100 shown in FIGS. 1 to 8, multiple battery cells 1 and lead plates 3 are positioned in fixed positions using cell holders 2 to form a battery assembly 10, which is then housed in an exterior case 4. The cell holders 2 arrange the multiple battery cells 1 in a parallel orientation with their electrode end surfaces 1A flush with one another. The electrode end surfaces 1A are where the positive and negative electrodes are located. Each battery cell 1 in the battery module 100 described above has a central electrode 1b and a peripheral electrode 1a on its electrode end surface 1A. One of the central electrode 1b and the peripheral electrode 1a is a positive electrode, and the other is a negative electrode. The central electrode 1b and the peripheral electrode 1a are connected in series or parallel by welding the connection leads 31 of the lead plates 3, which are positioned opposite the electrode end surface 1A. For ease of explanation of the present invention, FIGS. 2 to 12 below show the battery module shown in FIG. 1 in an inverted state.

[0034] (Battery Assembly 10) The battery assembly 10 has cylindrical battery 1X cells 1 inserted into a cell holder 2 and arranged in multiple rows and columns in parallel orientation. The cell holder 2 has lead plates 3 arranged opposite the electrode end faces 1A of the battery cells 1.

[0035] (Battery cell 1) Battery cell 1 has positive and negative electrodes on electrode end surfaces 1A. The battery cell 1 shown in the figure is a cylindrical battery 1X. Although not shown, cylindrical battery 1X has an electrode assembly housed in a cylindrical outer can 1B, which is filled with electrolyte and the opening of the outer can 1B is sealed with a sealing plate via an insulating material such as a gasket. The cylindrical battery 1X shown in Figure 2 has a central electrode 1b in the center of the sealing plate insulated by the insulating material, and a peripheral electrode 1a on the outer periphery of the outer can 1B.

[0036] The battery cells 1 can be lithium-ion secondary batteries. Lithium-ion secondary batteries have a high charge / discharge capacity relative to their weight and capacity. However, the present invention does not limit the battery cells 1 to lithium-ion batteries; secondary batteries such as currently used or future all-solid-state batteries can also be used. Furthermore, in the battery module 100 illustrated below, the battery cells 1 are cylindrical batteries 1X. However, the battery cells 1 are not limited to cylindrical batteries 1X; prismatic batteries and other types can also be used. The number of battery cells 1 is determined optimally based on the battery module's intended use, charge / discharge capacity, maximum load current, and capacity of each battery cell, and can be, for example, 10 to 100. The battery assembly 10 can increase the maximum current supplied to the load by connecting more battery cells 1 in parallel, and increase the total number of battery cells to increase the overall charge / discharge capacity. The battery module 100 shown in Figures 1 and 2 has 24 battery cells 1 arranged in parallel, with the electrode end surfaces 1A aligned on the same plane. The 24 battery cells are connected in a 6-parallel / 4-series configuration, with six battery cells 1 connected in parallel via lead plates 3 to form a parallel unit, and adjacent parallel units connected in series via lead plates 3. However, the arrangement of the battery cells in a battery module is not limited to the above and can be modified in various ways depending on the application and purpose. For example, as shown in Figure 13, 48 battery cells 1 can be connected in a 12-parallel / 4-series configuration, with the electrode end surfaces 1A of all battery cells 1 arranged in a parallel position with the same plane.

[0037] (Cell holder 2) The cell holder 2 in Figure 1 is made up of a main cell holder 2A that holds the battery cells 1 and lead plates 3 in place, a holding plate 2B that is connected to the main cell holder 2A, and a cover plate 2C that closes the surface of the holding plate 2B. The main cell holder 2A and holding plate 2B can be made from thermoplastic resin such as plastic, which is an insulating material.

[0038] As shown in Figures 1 and 2, the main cell holder 2A has a surface plate 21 integrally molded and connected to the end of the holding section 50, into which each battery cell 1 is inserted and positioned. The main cell holder 2A shown in the figures is structured so that the ends of the battery cells 1 are inserted into multiple battery insertion sections 51 provided in the holding section 50 and positioned in a fixed position. The battery insertion sections 51 are cylindrical and fit along the outer periphery of the battery cells 1, and the inner shape of the battery insertion section 51 is approximately the same as the outer shape of the cylindrical batteries 1X, positioning the inserted cylindrical batteries 1X in a fixed position without misalignment. However, the cell holder is not limited to the above structure and can have any other structure that can hold multiple batteries in a fixed position.

[0039] The cell holder 2 shown in FIG. 1 uses both the main cell holder 2A and the retaining plate 2B to position the battery cells 1 in their designated positions. The main cell holder 2A inserts the battery cells 1 into its cylindrical battery insertion section 51 and positions them in their designated positions, while the retaining plate 2B inserts the battery cells 1 into its through-holes 52 and positions them in their designated positions. The retaining plate 2B is connected to the main cell holder 2A and positions the battery cells 1 in their designated positions. The retaining plate 2B has through-holes 52 into which the ends of each cylindrical battery 1X are inserted. The inner shape of the through-holes 52 is larger than the maximum tolerance of the outer shape of the cylindrical batteries 1X so as not to affect the positioning of the battery cells 1 inserted in the battery insertion section 51. With cylindrical batteries 1X inserted into the battery insertion section 51 of the main cell holder 2A, the retaining plate 2B is connected to the main cell holder 2A and positions each battery cell 1 in the cylindrical battery insertion section 51 of the main cell holder 2A and the through-holes 52 of the retaining plate 2B. A cover plate 2C is fixed to the outer surface of the holding plate 2B. The cover plate 2C is disposed on the bottom surface of the cylindrical battery 1X, that is, on the surface opposite the electrode end surface 1A.

[0040] The main cell holder 2A in FIG. 1 has an integral connecting tube 53 that connects to the holding plate 2B. The connecting tube 53 protrudes vertically from the holding portion 50 toward the holding plate 2B. The main cell holder 2A has multiple connecting tubes 53 at predetermined intervals along the outer periphery of the holding portion 50. The connecting tube 53 has a female threaded hole 53a on its upper end surface as shown in FIG. 1. A set screw 54 threads into this female threaded hole 53a and penetrates the holding plate 2B, connecting the holding plate 2B to the main cell holder 2A. The holding plate 2B has an outer peripheral wall 55 around its periphery, which has a downward-protruding spacing rib 56. The spacing rib 56 creates a cooling gap between the outer peripheral wall 55 of the holding plate 2B and the outer peripheral wall 55 of the main cell holder 2A. This cell holder 2 can cool the battery cells 1 by blowing air into the cooling gap.

[0041] The cell holder 2 secures a cover plate 2C to the holder plate 2B. The cover plate 2C is secured to the holder plate 2B with set screws 58. The set screws 58 are threaded into threaded holes along the outer wall 55 of the holder plate 2B or on the inside of the outer wall 55 to secure the cover plate 2C to the holder plate 2B. The cover plate 2C is positioned away from the surface of the holder plate 2B and supports the end faces of the cylindrical batteries 1X inserted into the through holes 52 in the holder plate 2B. This allows the cover plate 2C to hold the bottom surfaces of multiple cylindrical batteries 1X while positioning them flush. The holder plate 2B has an integral partitioning rib 57 that protrudes toward the inner surface of the cover plate 2C. The partitioning rib 57 can insulate adjacent battery cells 1 with a potential difference. This structure uses cylindrical batteries 1X with an electric potential on the exposed outer can 1B. These cylindrical batteries 1X are placed close to each other while maintaining a potential difference, and the partitioning rib 57 between them ensures reliable insulation.

[0042] The cover plate 2C can be made of insulating material such as plastic to reliably insulate the battery cell 1, but it can also be made of a metal plate. As shown in Figure 13, by sandwiching a thermally conductive sheet 7 with insulating properties between the metal cover plate 2C and the battery cell 1, it can also serve to efficiently dissipate heat generated by the battery cell 1 during charging and discharging.

[0043] The cell holder 2, which positions the battery cells 1 in fixed positions, also positions the lead plates 3 in fixed positions, preventing the lead plates 3 from shifting relative to the battery cells 1 and accurately positioning the connection leads 31 of the lead plates 3 in positions facing the electrodes of the battery cell 1. The cell holder 2 in Figures 2 to 7 has multiple lead plates 3 arranged on the outer surface of the surface plate 21 of the main cell holder 2A. The surface plate 21 positions the multiple lead plates 3 at intervals in the longitudinal direction, and between adjacent lead plates 3, peripheral ribs 22 are integrally formed to position the lead plates 3 (their outer edges) inward. The peripheral ribs 22 are positioned between adjacent lead plates 3 and can also be used as insulating ribs for the adjacent lead plates 3.

[0044] (Position restriction stopper 24) The cell holder 2 is provided with positioning stoppers 24 that position each lead plate 3 in a fixed position to prevent misalignment due to dimensional errors during the manufacturing process and to position the lead plates 3 in their fixed positions with high precision. The positioning stoppers 24 are provided on the surface plate 21 of the main cell holder 2A. The cell holder 2 shown in Figures 2 to 5 uses a portion of the peripheral rib 22, which is provided in a rib shape on the surface of the surface plate 21 of the main cell holder 2A, as the positioning stopper 24. This structure allows the positioning stoppers 24 to be formed by the peripheral rib 22 that is provided to insulate adjacent lead plates 3, without the need for a separate dedicated positioning stopper.

[0045] Peripheral rib 22, part of which also serves as position-regulating stopper 24, positions lead plate 3 inside so that it can be displaced. Lead plate 3 shown in FIG. 3 is placed in fitting recess 25, which is surrounded by peripheral rib 22 and outer peripheral wall 23. Lead plate 3 is positioned in fitting recess 25 so that it can be displaced. The inner shape of fitting recess 25 is slightly larger than the outer shape of lead plate 3, and a displaceable gap is provided between the outer peripheral edge of lead plate 3 and the inner surface of fitting recess 25, so that lead plate 3 is positioned so that it can be displaced.

[0046] The above battery module 100 has a feature in that the lead-plates 3 can be connected to the cell holders 2 in accurate positions with a simple structure in which the position restriction stoppers 24 of the cell holders 2 are rib-shaped and the cutting lines 33 of the lead-plates 3 are pressed against them. In particular, the above battery module 100 positions the lead-plates 3 in a fixed position by pressing the position restriction stoppers 24 as ribs and the cutting lines 33 of the lead-plates 3 against them as collision portions 34, eliminating the need to process the lead-plates 3 into a special shape to provide protrusions. This feature reduces manufacturing costs by enabling inexpensive mass production of lead-plates 3 that can be connected to the cell holders 2 in fixed positions. Furthermore, because the cutting lines 33 of the lead-plates 3 are pressed against the rib-shaped position restriction stoppers 24 to position the lead-plates 3 and the cell holders 2 in accurate positions, the collision portions 34 of the lead-plates 3 and the position restriction stoppers 24 are pressed against each other, and this feature allows the lead-plates 3 to be positioned more accurately without deforming them.

[0047] (Connection mechanism 40) Furthermore, the cell holder 2 in FIG. 3 displaceably connects the lead plate 3 via a connecting mechanism 40. The connecting mechanism 40 and the mating recess 25 position the lead plate 3 on the cell holder 2 so that the collision portion 34, which is the cutting line 33 of the lead plate 3, can be displaced in a direction that brings the collision portion 34 closer to the position-regulating stopper 24 of the cell holder 2. The connecting mechanism 40 guides the insertion boss 42 of the cell holder 2 into the connecting hole 41 provided in the lead plate 3. This can be achieved by providing a displacement gap 43 between the connecting hole 41 and the insertion boss 42 in the pressing direction of the elastic arm portion 35, which will be described later. The connecting mechanism 40 described above has a simple structure that guides the insertion boss 42, which is the connecting protrusion of the cell holder 2, into the connecting hole 41 of the lead plate 3. This allows the lead plate 3 and the cell holder 2 to be displaceably connected, and restricts the displacement direction of the lead plate 3, guiding it in the intended direction for positioning. Furthermore, as described above, the structure in which the lead plate 3 is connected to the cell holder 2 in a freely displaceable manner allows the collision portion 34 of the lead plate 3 to be pressed against the position-regulating stopper 24 by the reaction force of the elastic arm portion 35 described later pressing against the cell holder 2, thereby allowing the lead plate 3 and cell holder 2 to be positioned accurately in the cell holder 2, thereby allowing efficient assembly while the lead plate 3 and cell holder 2 are connected.

[0048] In the above example, a part of the peripheral rib 22 is used as the position restricting stopper 24, but the present invention can also provide a position restricting stopper on the surface of the surface plate separately from the peripheral rib, although this is not shown.

[0049] (Lead plate 3) The lead plates 3 are set into the fitting recesses 25 inside the outer wall 23 and peripheral rib 22 of the cell holder 2 and connected to the battery cells 1. The lead plates 3 have connection leads 31 that are welded to the positive and negative electrodes of each battery cell 1. The connection leads 31 are connected by welding the welding section at their tip to the battery cell 1 electrode. Methods such as laser welding, spot welding, and ultrasonic welding can be used to weld the connection leads 31. Metal plates with good electrical and thermal conductivity are used for the lead plates 3. For example, metal plates such as iron plates with a nickel-plated surface, nickel plates, copper plates, and aluminum plates can be suitably used for the lead plates.

[0050] The lead-plate 3 has connection leads 31 welded to the electrodes. The connection leads 31 are positioned opposite the electrodes of the battery cell 1 and welded to the electrodes. A single lead-plate 3 has multiple connection leads 31 for connection to multiple battery cells 1. The lead-plate 3 shown in Figures 2 to 7 has multiple connection leads 31 formed by cutting a portion of a metal plate. This lead-plate 3 has slits 32 formed between the connection leads 31 and the plate-shaped main plate portion 30, separating the connection leads 31 from the main plate portion 30 and connecting the rear ends of the connection leads 31 to the main plate portion 30. The connection leads 31 are arm-shaped and extend from the main plate portion 30 toward their tip ends, with the tip being a welded portion. The lead-plate 3 has a second connection lead 31b that connects to the central electrode 1b of the battery cell 1 and a first connection lead 31a that connects to the peripheral electrode 1a. The second connection lead 31b is positioned so that it extends in the radial direction of the cylindrical battery 1X, and the first connection lead 31a is positioned so that it extends in the tangential direction of the circular peripheral electrode 1a located on the outer periphery of the cylindrical battery 1X. The lead-plate 3 in Figures 6 and 7 positions the first connection lead 31a and second connection lead 31b so that they are perpendicular to each other, with the first connection lead 31a extending in the tangential direction of the cylindrical battery 1X and the second connection lead 31b extending in the radial direction of the cylindrical battery 1X.

[0051] (Structure for arranging lead plate 3 in fixed position in cell holder 2) The cell holder 2 positions the lead plates 3 in fixed positions, which are welded to the electrodes of the battery cells 1. The cell holder 2 is provided with positioning stoppers 24 to position the lead plates 3 in fixed positions. The lead plates 3 are pressed against the positioning stoppers 24 to be positioned in fixed positions, and the connection leads 31 are welded to the electrodes of the battery cells 1. The lead plates 3 are equipped with elastic arm portions 35 that elastically press against the cell holder 2. The lead plates 3 are pressed against the positioning stoppers 24 as a reaction to the elastic arm portions 35 pressing against the cell holder 2, and are positioned in their fixed positions on the cell holder 2.

[0052] The elastic arm 35 shown in FIGS. 2 to 7 utilizes the outer shape of the lead plate 3 to form a spring shape that is bent or folded back, guiding the lead plate 3 in one direction. The lead plate 3 shown in FIG. 3 has an elastic arm 35 on its right edge that presses against the outer wall 23 or peripheral rib 22 of the cell holder 2. The elastic arm 35 shown in the figure is formed by bending a metal piece protruding from the main plate 30. This elastic arm 35 can be easily formed by cutting a metal plate into a predetermined shape to form the lead plate 3, and then bending the protruding piece protruding from the main plate 30. The lead plate 3 shown in the figures has elastic arms 35 on both ends of the right edge of the main plate 30. With this structure, multiple elastic arms 35 simultaneously press against the outer wall 23 or peripheral rib 22 of the cell holder 2, allowing the lead plate 3 to be stably displaced in a predetermined direction through a reaction force.

[0053] However, the shape, width, thickness, number, structure, mode, and location of the elastic arm portion 35 are not limited. For example, the elastic arm portion 35 can be bent or folded in various shapes, or can be left unfolded. Furthermore, as shown in Figures 9 to 12, which will be described later, the elastic arm portion 35 and the connecting mechanism 40 can be integrated to perform both pressing and positioning by elastic force. Furthermore, although not shown, a convex portion can be provided on the cell holder side, and the shape and structure can be such that the cell holder is received by a concave portion on the elastic arm portion.

[0054] Furthermore, the lead plate 3 is also provided with a collision portion 34 that positions itself in a fixed position when it comes into contact with the position-regulating stopper 24 of the cell holder 2. When the collision portion 34 of the lead plate 3 approaches the cell holder 2 and abuts against the position-regulating stopper 24, it acts as a stopper to regulate the position and hold the cell holder in the intended predetermined position. As described above, the lead plate 3 is set in the cell holder 2 with a displaceable gap between it and the cell holder 2 so that the lead plate 3 moves relative to the cell holder 2 in reaction to the elastic arm portion 35 pushing the cell holder 2, and the collision portion 34 abuts against the position-regulating stopper 24 to be positioned in a fixed position.

[0055] 3, the lead-plate 3 has a cutting line 33 cut linearly along the outer edge of the metal plate as a collision area 34, and the positioning stopper 24 has a rib shape parallel to the cutting line 33 at the collision area 34. Furthermore, the first connection lead 31a attached to the lead-plate 3 is arm-shaped and extends tangentially to the peripheral electrode 1a of the cylindrical battery 1X, and the elastic arm 35 elastically presses the lead-plate 3 in the radial direction of the cylindrical battery 1X, with the first connection lead 31a directed toward the center of the cylindrical battery 1X. This structure urges the lead-plate 3 in the radial direction of the cylindrical battery 1X as a reaction to the elastic arm 35 pressing against the cell holder 2, preventing misalignment in this direction between the lead-plate 3 and the cell holder 2, and positions the first connection lead 31a without misalignment in the radial direction of the cylindrical battery 1X. This structure allows the first connection lead 31a to be reliably welded to the peripheral electrode 1a in a position extending tangentially to the peripheral electrode 1a without contacting the central electrode 1b. This is because the collision portion 34 is the linear cutting line 33, the positioning stopper 24 is a rib-shaped stopper that is parallel to the cutting line 33, and the first connection lead 31a is an arm-shaped stopper that extends parallel to the cutting line 33. This allows the cutting line 33 and the positioning stopper 24 to abut linearly over a predetermined length, positioning the lead-plate 3 accurately on the cell holder 2, particularly preventing misalignment of the first connection lead 31a in the width direction, and allowing the first connection lead 31a to be reliably welded to the peripheral electrode 1a of the cylindrical battery 1X without misalignment.

[0056] The lead plate 3 preferably has multiple elastic arm portions 35 spaced apart in the width direction. This lead plate 3 has the advantage that each elastic arm portion 35 presses against the cell holder 2, allowing the lead plate 3 to move in a parallel direction. Furthermore, the lead plate 3 preferably has multiple collision portions 34 spaced apart in the width direction. This lead plate 3 has the advantage that each collision portion 34, spaced apart in the width direction of the lead plate 3, can be positioned in a fixed position by a positioning stopper 24, allowing the entire lead plate 3 to be positioned in a fixed position. The lead plate 3 shown in FIG. 3 has elastic arm portions 35 on both sides in the width direction, and collision portions 34 on both sides in the width direction. This lead plate 3 has the advantage that each elastic arm portion 35 presses against the cell holder 2, allowing the lead plate 3 to move in a parallel direction. Furthermore, the parallel-moving lead plate 3 can be positioned in a fixed position by the collision portions 34 on both sides, allowing the entire lead plate 3 to be positioned in a fixed position with high precision.

[0057] Furthermore, the lead-plate 3 in Figures 2 to 7 has a bridge plate portion 36 on part of the main plate portion 30. The bridge plate portion 36 is located between the cutting line 33 of the collision portion 34 and the first connection lead 31a. A slit 32 is provided between the bridge plate portion 36 and the first connection lead 31a. The connection lead 31 has a base portion 37 connected to the main plate portion 30 and has slits 32 around its periphery. The connection lead 31 can be welded by moving its welding portion toward the electrode end surface 1A of the battery cell 1. The edge of the bridge plate portion 36 facing the position restriction stopper 24 is the cutting line 33 of the collision portion 34, and the position restriction stopper 24, cutting line 33, and first connection lead 31a are positioned parallel to each other. The first connection lead 31a extends tangentially to the peripheral electrode 1a of the cylindrical battery 1X, and the welding portion at its tip is welded to the peripheral electrode 1a. The width (W) of the bridge plate portion 36 is, for example, 20 mm or less, preferably 15 mm or less, and more preferably 10 mm or less, so that the first connection lead 31a can be positioned with greater precision on the peripheral electrode 1a of the cylindrical battery 1X without misalignment.

[0058] The above structure has the advantage of being able to position the first connection lead 31a facing the peripheral electrode 1a with high precision and without misalignment, ensuring reliable welding. This is because the first connection lead 31a is positioned close to the cutting line 33 of the collision section 34 via the bridge plate section 36, and the first connection lead 31a extending tangentially to the peripheral electrode 1a and the cutting line 33 of the collision section 34 are positioned parallel to each other, ensuring that the collision section 34 of the cutting line 33 reliably prevents the first connection lead 31a from misaligning in the radial direction of the cylindrical battery 1X.

[0059] 8, the first connection lead 31a can be positioned in a predetermined position by locating the collision portion 34 of the lead plate 3 at the base portion 37 of the first connection lead 31a and having this collision portion 34 abut against the position restriction stopper 24 on the wall that restricts the position. This is because the base portion 37 is closer to and more directly connected to the first connection lead 31a, and the collision portion 34 of the cutting line 33 can reliably prevent the first connection lead 31a from shifting in the radial direction of the cylindrical battery 1X.

[0060] The connecting mechanism 40 shown in the enlarged views of essential parts in Figures 4 and 6 is composed of a connecting hole 41 that is elongated in the displacement direction and penetrates the lead plate 3, and an insertion boss 42 that protrudes from the surface plate 21 of the cell holder 2. A displacement gap 43 is provided between the connecting hole 41 and the insertion boss 42 in the direction in which the collision portion 34 approaches the positioning stopper 24 and in the pressing direction of the elastic arm portion 35. This allows the collision portion 34 of the lead plate 3 to move toward the positioning stopper 24, i.e., the lead plate 3 is displaceably connected to the cell holder 2. This connecting mechanism 40 has a simple structure in which the insertion boss 42 is integrally formed with the cell holder 2 and a connecting hole 41 is provided through the lead plate 3, allowing the lead plate 3 to be connected to the cell holder 2 so that it can be displaced in the pressing direction of the elastic arm portion 35. The connecting mechanism 40 restricts the displacement direction of the lead plate 3, thereby guiding and positioning the lead plate 3 in the intended direction.

[0061] As described above, the structure in which the cell holder 2 is provided with a mating recess 25 and further the lead plate 3 and cell holder 2 are connected in a displaceable manner by a connecting mechanism consisting of a connecting hole and an insertion boss has the advantage of being able to assemble efficiently, since the lead plate 3 can be easily set in a predetermined position on the cell holder 2 and then pressed against the cell holder 2 with the elastic arm portion 35 to place the lead plate 3 in the fixed position on the cell holder 2.

[0062] The connecting mechanism 40 has a structure in which an insertion boss 42 of the cell holder 2 is inserted into a connecting hole 41 provided in the lead plate 3, and can be realized by providing a displacement gap 43 between the connecting hole 41 and the insertion boss 42 in the pressing direction of the elastic arm 35. The above connecting mechanism 40 has a simple structure in which the insertion boss 42 of the cell holder 2 is inserted into the connecting hole 41 of the lead plate 3, and can displaceably connect the lead plate 3 to the cell holder 2. Furthermore, the structure in which the lead plate 3 is displaceably connected to the cell holder 2 as described above is urged in the opposite direction by the reaction of the elastic arm 35, which will be described later, pressing the lead plate 3 against the positioning stopper 24, thereby accurately positioning the cell holder 2. This allows efficient assembly of the lead plate 3 and cell holder 2 in a connected state.

[0063] As described above, the displacement direction of the lead plate 3 can be restricted by the connecting mechanism 40 consisting of the elongated connecting holes 41 and the insertion bosses 42. Furthermore, the connecting mechanism 40 can be configured with the peripheral rib 22, the outer peripheral wall 23, and the cutting lines or side edges of the lead plate 3 that move along them, to specify the displacement direction of the lead plate 3. For example, as shown in FIG. 3, the connecting mechanism 40 can use parts of the peripheral rib 22 that are arranged parallel to the pressing direction of the elastic arm portion 35 as left and right guide walls 27 to restrict the displacement direction of the lead plate 3. The left and right guide walls 27 can be used as a substitute for the connecting mechanism 40 or in addition to it.

[0064] (Embodiment 2) The battery module 200 in FIGS. 9 to 12 shows a specific example in which the shape and structure of the lead-plate 3 connected to the cell holder 2 are different. In this embodiment, the shape and structure of the lead-plate 3 connected to the cell holder 2 are the same as those of the first embodiment. The lead-plate 3 differs from the first embodiment in the structure of the elastic arm portion 35 that elastically presses the cell holder 2. The elastic arm portion 35 of the lead-plate 3 shown in FIGS. 9 to 11 is a leaf spring with a protruding piece that protrudes inward from the edge of the opening of the connection hole 45 opened in the main plate portion 30. In this structure, the lead-plate 3 guides the insertion boss 42 of the cell holder 2 into the connection hole 45, and the elastic arm portion 35, which is a leaf spring with a protruding piece, presses the insertion boss 42. The lead-plate 3 is urged in the opposite direction by the reaction of the elastic arm portion 35 pressing the insertion boss 42, and is displaced toward the position restriction stopper 24. As a result, the collision portion 34 of the lead plate 3 approaches the position restriction stopper 24, and the collision portion 34 comes into contact with the position restriction stopper 24 while being pressed against it, thereby positioning the lead plate 3.

[0065] The elastic arm portion 35a in FIG. 9 elastically presses one side surface of the insertion boss 42 guided into the connecting hole 45, thereby urging the lead plate 3 in the displacement direction. Therefore, the lead plate 3 in this figure, with the elastic arm portion 35a and the connecting mechanism 40 integrated, connects the lead plate 3 to the cell holder 2 in a displaceable manner. The elastic arm portion 35a urges the collision portion 34 of the lead plate 3 in a direction pressing it against the positioning stopper 24. The elastic arm portion 35a in FIG. 9 urges the lead plate 3 in a direction perpendicular to the collision portion 34 and the positioning stopper 24, which are linear and arranged in parallel. The elastic arm portion 35a in FIG. 9 elastically presses one side surface of the insertion boss 42 guided into the connecting hole 45, thereby urging the lead plate 3 in the displacement direction. The connecting hole 45 in FIG. 9 is tapered in one direction so that the lead plate 3 can be guided toward the intended position, thereby functioning as the connecting mechanism 40.

[0066] The shape, width, thickness, etc. of the elastic arm portion 35 protruding into the connecting hole 45 can be determined appropriately depending on the elastic force and the pressing direction. Multiple elastic arm portions 35 can be provided protruding into one connecting hole 45. Figure 10 shows three elastic arm portions 35b, 35c, and 35d pressing against one connecting hole 45 with elastic forces from three directions. In Figure 10, elastic arm portion 35b presses in the same elastic direction as elastic arm portion 35a in Figure 9. Furthermore, elastic arm portions 35c and 35d press from the left and right in a direction perpendicular to the elastic direction of elastic arm portion 35b, sandwiching the insertion boss 42 and preventing left-right misalignment. When multiple elastic arm portions 35 are provided, each elastic arm portion 35 can have a different elastic force. For example, the elastic arm portion 35b in Fig. 10 can be used as the main elastic force, and can provide a stronger elastic pressing force than the secondary elastic arm portions 35c and 35d, which suppress left-right misalignment. In Fig. 11, two elastic arm portions 35e and 35f press against one connecting hole 41 with elastic forces from two directions. The elastic arm portions 35e and 35f function to press in the elastic direction as with the elastic arm portion 35a in Fig. 9, and also to restrict left-right movement.

[0067] As shown in FIGS. 9 to 11, even when the elastic arm portion 35 and the connecting mechanism 40 are integrated to connect the lead plate 3 to the cell holder 2 in a displaceable manner, preferably, multiple connecting mechanisms 40 are arranged spaced apart in the width direction of the lead plate 3, and the cell holder 2 and the lead plate 3 are connected via these connecting mechanisms 40. Multiple connecting holes 45 and elastic arm portions 35 are arranged in the lead plate 3, and multiple insertion bosses 42 are arranged in the cell holder 2, spaced apart in the width direction of the lead plate 3. The connecting mechanism 40 of the first embodiment shown in FIGS. 3 to 7 and the positioning connecting mechanism 40 of the second embodiment can be used together. Furthermore, the elastic arm portion 35 utilizing the outer shape of the lead plate 3 of the first embodiment and the elastic arm portion 35 shown in FIG. 12 can also be used together.

[0068] The elastic arm portion 35 shown in Figures 9 to 11 is a leaf spring and is configured to elastically press the insertion boss 42 guided in the connecting hole 45, thereby pressing the cell holder 2. However, the leaf spring-like elastic arm portion 35 is not limited to a structure that presses the insertion boss 42 guided in the connecting hole 45. The lead plate 3 shown in Figure 12 has a leaf spring-like elastic arm portion 35g on its outer periphery, and the cell holder 2 has a protrusion 28 that protrudes from the outer periphery wall 23 or peripheral rib 22 toward the fitting recess 25, and this protrusion 28 is pressed by the elastic arm portion 35g. The lead plate 3 shown in the figures has a recess 38 on its outer periphery that guides the protrusion 28 of the cell holder 2, and is configured to elastically press the protrusion 28 by the elastic arm portion 35g, which is a protruding piece provided inside the recess 38. 12 includes an extension 28a extending in the displacement direction of lead-plate 3 in a plan view, and a semicircular curved portion 28b connected to the tip of extension 28a. Lead-plate 3 has a resilient arm 35g positioned inside recess 38 that guides protrusion 28, facing curved portion 28b, and pressing against protrusion 28. Resilient arm 35g presses protrusion 28 in the extension direction of extension 28a, and urges lead-plate 3 in the opposite direction as a reaction to the pressing force, displacing lead-plate 3 in a predetermined direction. [Industrial Applicability]

[0069] The battery module according to the present invention can be suitably used as a chargeable and dischargeable battery module for battery-powered devices such as assisted bicycles, electric motorcycles, electric wheelchairs, electric carts, cleaners, and power tools. [Explanation of symbols]

[0070] 100, 200... Battery Module 1...Battery cell 1x cylindrical battery 1A…electrode end surface 1B...Outer can 1a...Peripheral electrode 1b…Central electrode 2...Cell holder 2A...Main cell holder 2B...Retaining plate 2C...Cover plate 3...Reed plate 4...Outer case 7...Thermal conductive sheet 10. Battery assembly 21...Surface plate 22...Peripheral rib 23…Outer wall 24...Position control stopper 25...Mating recess 27…Guiding wall 28...Convex part 28a...Extension part 28b...Bend 30...Main body plate 31...Connection lead 31a...First connection lead 31b...Second connecting lead 32...Slit 33...Cutting line 34...Collision part 35, 35a, 35b, 35c, 35d, 35e, 35f, 35g...Elastic arm part 36...Bridge plate 37...Base 38...recess 40...Connection mechanism 41...Connection hole 42...Insertion boss 43...Displacement gap 50...Holding part 51...Battery insertion section 52...Through hole 53...Connection tube 53a...female screw hole 54...Set screw 55...Outer wall 56...Space rib section 57...Dividing rib 58...Set screw

Claims

1. A plurality of battery cells; a lead plate formed by welding a connection lead to an electrode of the battery cell; a cell holder that connects the battery cell and the lead plate; the cell holder includes a position-regulating stopper for locating the lead plate in a fixed position; The lead plate is an elastic arm portion that elastically presses the cell holder; a collision portion that is biased by a reaction force of the elastic arm portion pressing the cell holder and abuts against the position restriction stopper, Furthermore, the lead plate is disposed in the cell holder so as to be displaceable in a direction in which the collision portion approaches the position regulating stopper, the lead plate is displaced by a reaction force of the elastic arm portion pressing against the cell holder, and the collision portion of the lead plate abuts against the position regulating stopper, so that the lead plate is arranged at a fixed position in the cell holder, the cell holder and the lead plate are connected via a connecting mechanism that can displace the relative positions of the cell holder and the lead plate in a direction that brings the collision portion closer to the position regulating stopper, The coupling mechanism a connecting hole formed in the lead plate; an insertion boss provided on the cell holder and inserted into the connecting hole; The battery module has a displacement gap provided between the connecting hole and the insertion boss in a direction that allows the collision portion to approach the position restriction stopper.

2. The battery module according to claim 1, The position-regulating stopper has a rib shape that protrudes from the surface of the cell holder, The battery module, wherein the collision portion is a cutting line of the lead plate.

3. The battery module according to claim 1 or 2, The battery cell is a cylindrical battery having a central electrode in the center and a peripheral electrode on the outer periphery of the electrode end surface, The lead plate is a first connection lead welded to a peripheral electrode of the battery cell; a second connection lead welded to the central electrode of the battery cell; A battery module comprising:

4. The battery module according to claim 3, The first connection lead of the lead plate has an arm shape extending in a tangential direction of the peripheral electrode of the cylindrical battery, The battery module is configured such that the lead plate is biased so that the first connection lead is displaced toward the center of the cylindrical battery.

5. The battery module according to claim 3 or 4, The collision portion is A cutting line made by cutting a metal plate in a straight line. The position restriction stopper is A rib shape arranged parallel to the cutting line of the collision portion, The first connection lead of the lead plate is The battery module has an arm shape extending in a direction parallel to the cutting line of the collision portion and the position restriction stopper.

6. The battery module according to claim 5, The lead plate is a bridge plate-shaped portion is provided between the first connection lead and the collision portion, a slit is provided between the bridge plate portion and the first connection lead; The bridge plate-shaped portion is The edge facing the position regulating stopper is set as the cutting line of the collision portion, the cutting line of the collision portion and the first connection lead are arranged in a parallel orientation to each other, The first connection lead extends in a tangential direction of the peripheral electrode and is welded to the peripheral electrode.

7. The battery module according to claim 6, A battery module in which the width of the bridge plate-shaped portion is 20 mm or less.

8. The battery module according to any one of claims 3 to 7, a base portion of the first connection lead; The battery module in which the collision portion of the lead plate is arranged.

9. The battery module according to any one of claims 3 to 8, The lead plate is a metal plate integrally provided with the first connection lead extending in the tangential direction of the cylindrical battery.

10. The battery module according to any one of claims 3 to 9, The lead plate is a battery module in which the first connection lead and the second connection lead are provided in directions perpendicular to each other;

11. The battery module according to any one of claims 1 to 10, The lead plate is The battery module includes a plurality of elastic arm portions spaced apart in the width direction of the lead plate.

12. The battery module according to any one of claims 1 to 11, The lead plate is The battery module includes a plurality of the collision portions spaced apart in the width direction of the lead plates.

13. The battery module according to any one of claims 1 to 12, The position restriction stopper is The battery module has ribs formed integrally with the cell holder so as to protrude from the surface.

14. The battery module according to any one of claims 1 to 13, The position restriction stopper and the opposing edge of the collision portion are The battery module extends in a direction intersecting the pressing direction of the elastic arm portion.

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