Battery pack

Abstract

To provide a battery pack which can suppress entrance of foreign material at the time of conveyance and is highly versatile.SOLUTION: A battery pack 10 includes: a cell laminate body 30 in which plural battery cells 40 are laminated; and a case 20 for storing the cell laminate body 30. The case 20 includes: a cell storage space 25 in which the cell storage body 30 is stored, the cell storage space being closed from the outside; an output terminal storage space 27 to which an output conduction member 61 extending from the cell storage space 25 and a drawing conduction member 70 intruding from a first opening part 91 are connected; and a lid member 15 for removably closing the first opening part 91.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a battery pack. [Background technology]

[0002] In recent years, research and development into secondary batteries that contribute to energy efficiency has been conducted in order to ensure that more people have access to affordable, reliable, sustainable and advanced energy.

[0003] Conventional electric vehicles and hybrid vehicles are equipped with one battery pack in which multiple battery modules are housed in a battery case (for example, Patent Document 1). However, in this case, a battery pack needs to be designed for each vehicle, which poses a problem of lack of versatility of the battery pack.

[0004] Also, Patent Document 2 proposes a battery that can be transferred. Patent Document 2 describes that in order to facilitate the attachment and detachment of the battery and the cable terminal during transfer, a slit is provided in the terminal block, and with a Y-shaped (U-shaped) terminal of the cable inserted through the slit, a cam lever exposed to the outside is rotated to fasten the terminals together. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2000-62472 A [Patent Document 2] Patent No. 5945785 Summary of the Invention [Problem to be solved by the invention]

[0006] In Patent Document 2, since the cable terminal is inserted through the slit in the terminal block, only U-shaped terminals can be used as cable terminals, and there is an issue with versatility. On the other hand, if the connection terminal of the terminal block is exposed during transportation, there is a risk that foreign objects may enter the inside of the battery pack, which is undesirable.

[0007] The present invention provides a highly versatile battery pack that can prevent intrusion of foreign matter during transportation, and thus contributes to improved energy efficiency. [Means for solving the problem]

[0008] The present invention relates to A cell stack in which a plurality of battery cells are stacked; A battery pack comprising: a case in which the cell stack is housed; The case is a cell accommodating space that accommodates the cell stack and is closed from the outside; an output terminal accommodating space in which a conductive member extending from the cell accommodating space and an external conductive member entering through an opening are connected; and a cover member that removably closes the opening. Effect of the Invention

[0009] According to the present invention, the battery pack can be mounted in various devices while preventing foreign matter from entering the case. [Brief description of the drawings]

[0010] [Figure 1] 1 is an external perspective view of a battery pack 10. FIG. [Diagram 2] FIG. 2 is an exploded perspective view of the battery pack 10. [Diagram 3] FIG. 2 is an exploded perspective view of the cell stack 30. [Figure 4] FIG. 2 is a plan view of the battery pack 10. [Diagram 5] 13 is a diagram showing an output terminal accommodating space 27 of a modified example. FIG. [Figure 6] FIG. 2 is an external perspective view of the battery assembly 100. [Figure 7] 1 is an external perspective view of the battery assembly 100 seen from the bottom side with the bottom cover 126 disassembled. FIG. [Figure 8] FIG. 2 is an external perspective view of a central frame 120. [Figure 9] 1 is an external perspective view of a central frame 120 seen from the bottom side with a bottom cover 126 disassembled. FIG. [Figure 10] FIG. 1 is a side view of a four-wheeled vehicle 301 in which a battery assembly 100 is disposed under a floor. [Figure 11] FIG. 1 is a side view of a two-wheeled vehicle 302 equipped with a battery assembly 100A. [Figure 12] FIG. 1 is a side view of a lawnmower 303 equipped with a battery assembly 100A. [Figure 13] 1 is a side view of the transport platform 304 on which the battery assembly 100A is mounted. [Figure 14] FIG. 11 is a side view of an electric power unit 305 on which a battery assembly 100B is mounted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the battery pack of the present invention will be described with reference to the accompanying drawings. For convenience, the following description will be given using a coordinate system consisting of a front-rear direction, a left-right direction, and an up-down direction that are mutually orthogonal. In the drawings, the front is indicated as Fr, the rear as Rr, the left side as L, the right side as R, the upside as U, and the downside as D. However, these directions are unrelated to the direction in which the battery pack is mounted on the device. For example, when the battery pack is mounted on a vehicle, the up-down direction of the battery pack may face the traveling direction of the vehicle when mounted on the vehicle, or may face the vehicle width direction.

[0012] [Battery pack] As shown in Fig. 1 and Fig. 2, the battery pack 10 has two cell stacks 30 arranged side by side in the front-rear direction inside a box-shaped case 20. As shown in Fig. 3, the cell stack 30 has a plurality of rectangular battery cells 40 stacked in the left-right direction and an end plate 31 arranged on one side in the left-right direction (the left side in this embodiment), which are temporarily fixed with a predetermined pressure by using a binder 50. Note that a separator (not shown) may be arranged between adjacent battery cells 40. The binder 50 includes a rectangular lower restraint portion 51 surrounding the bottom surface of the cell stack 30, a rectangular upper restraint portion 52 surrounding the top surface of the cell stack 30, and a pair of side restraint portions 53 that sandwich the cell stack 30 from the front-rear direction, and the lower restraint portion 51 and the pair of side restraint portions 53 are integrally formed. Note that another end plate, separator, etc. may be arranged on the other side in the left-right direction of the cell stack 30 (the right side in this embodiment) so that the battery cells 40 on the other side do not directly contact the case 20. Furthermore, the cell stack 30 does not have to be configured in such a way that the multiple battery cells 40 are restrained by the binder 50;

[0013] The battery cell 40 is, for example, a secondary battery such as a lithium ion battery. A pair of terminal portions 42 and a safety valve 44 disposed between the pair of terminal portions 42 are provided on the upper surface of the battery cell 40. The pair of terminal portions 42 include a positive terminal and a negative terminal, and for example, the positive terminal is connected to the negative terminal of the adjacent battery cell 40 via a bus bar (not shown) and the negative terminal is connected to the positive terminal of the adjacent battery cell 40 via a bus bar (not shown), thereby electrically connecting the multiple battery cells 40 in series. For example, in order to shorten the length of the bus bar, the multiple battery cells 40 may be stacked so that the front-rear direction is alternately reversed.

[0014] The safety valve 44 is a burst type valve that prevents the outer can from bursting when the internal pressure of the battery cell 40 increases abnormally. When the internal pressure of the battery cell 40 increases abnormally, the safety valve 44 bursts and the gas inside the battery cell 40 is released to the outside. By providing the safety valve 44 at the center in the front-to-rear direction of the battery cell 40, the battery cells 40 can be gathered in the same front-to-rear position even if they are stacked so that their front-to-rear orientations are alternately reversed.

[0015] Returning to Fig. 2, the case 20 includes a case body 21 that is open at the top, and a case cover 23 that covers the opening of the case body 21. The case body 21 has a front wall portion 82 and a rear wall portion 84 that extend in the left-right direction, a left wall portion 86 that connects left ends of the front wall portion 82 and the rear wall portion 84, a right wall portion 87 that connects right ends of the front wall portion 82 and the rear wall portion 84, and a bottom wall portion 88. The space surrounded by the front wall portion 82, the rear wall portion 84, the left wall portion 86, and the right wall portion 87 constitutes a cell accommodating space 25 that accommodates the cell stack 30.

[0016] The left wall 86 has an opening 86a that communicates the cell accommodating space 25 with the outside, and the pressure plate 28 is attached via a sealant 16 (e.g., a rubber seal). By fixing the pressure plate 28 to the left wall 86, the pressure plate 28 comes into contact with the end plates 31 of each cell stack 30 through the opening 86a. By the pressure plate 28 pressing the end plates 31 inward, the cell stack 30 temporarily fixed at a predetermined pressure by the binder 50 is further pressurized in the stacking direction and held within the case 20. The pressure plate 28 may be fixed to the left wall 86 by welding such as friction stir welding, or may be fixed with bolts.

[0017] 1, the pressure plate 28 is provided with two pressure release valves 13 that communicate with the cell accommodating space 25. The pressure release valves 13 open when gas generated from a safety valve 44 of a battery cell 40 causes an abnormal increase in the internal pressure of the cell accommodating space 25, and release the gas inside the case 20 to the outside.

[0018] Further, in front of and to the left of the front wall 82, a bulging portion 22 is formed so as to protrude further forward from the front wall 82. A space is formed inside the bulging portion 22, and a first opening 91 is provided on the front surface, and a second opening 92 is also provided on the upper surface. A terminal block 60 to which the output conductive member 70 is connected is provided in the internal space of the bulging portion 22, forming the output terminal accommodating space 27. In the terminal block 60, a terminal portion (output terminal) of the output conductive member 61 extending from the cell accommodating space 25 to the output terminal accommodating space 27 is electrically connected to a terminal portion of the output conductive member 70 entering the output terminal accommodating space 27 from the first opening 91. The output conductive member 61 includes a positive side bus bar 62 and a negative side bus bar 63 extending from the positive side output terminal and the negative side output terminal of the two cell stacks 30 electrically connected in series, respectively. The output conductive member 70 includes a positive bus bar 72 and a negative bus bar 73 that are connected to an external positive terminal and a negative terminal, respectively.

[0019] 4, the first opening 91 is provided so as to be offset in the left-right direction with respect to a center line L in the left-right direction of the battery pack 10. That is, the center line L1 of the first opening 91 is provided so as to be offset in the left-right direction with respect to the center line L in the left-right direction of the battery pack 10.

[0020] The terminal block 60 is also provided so as to be oriented in the left-right direction with respect to the center line L in the left-right direction of the battery pack 10. In other words, the center line L2 of the terminal block 60 is provided so as to be offset in the left-right direction with respect to the center line L of the battery pack 10 in the left-right direction.

[0021] The terminal portion of the output conductive member 61 and the terminal portion of the output conductive member 70 are preferably fastened with bolts. By using bolts, the terminal portions of the output conductive member 61 and the output conductive member 70 may be round (R-shaped) or open-ended (Y-shaped). In this manner, by connecting the output conductive member 70 from the first opening 91 of the output terminal accommodating space 27, the battery pack 10 can be mounted on various devices.

[0022] Thus, the inside of the case 20 is provided with a cell accommodating space 25 that accommodates the two cell stacks 30, and an output terminal accommodating space 27 that is disposed in front of and to the left of the cell accommodating space 25 and to which the output conductive member 70 is connected. The number of cell stacks 30 accommodated in the cell accommodating space 25 may be one, or three or more.

[0023] In the front wall portion 82, a region separating the cell accommodating space 25 and the output terminal accommodating space 27 (hereinafter, this portion is referred to as a partition portion 85) is lower in height than other regions. The positive side bus bar 62 and the negative side bus bar 63 extend from above the partition portion 85 into the output terminal accommodating space 27, and are fixed to a terminal block 60 provided in the output terminal accommodating space 27.

[0024] 1, a signal line connector 67 is provided in the output terminal accommodating space 27. A signal line is connected to the signal line connector 67 via a through hole provided in the partition wall portion 85 that connects the cell accommodating space 25 and the output terminal accommodating space 27.

[0025] As shown in FIG. 2, the case cover 23 is attached to the upper surface of the case 20, excluding the partition wall portion 85, via a first seal material 11 (e.g., a rubber seal). The case cover 23 is fixed to the upper surface of the case 20 by welding, for example, friction stir welding or the like. A second seal material 12 (e.g., a foam seal) is provided in the gap between the partition wall portion 85 and the case cover 23, and the cell accommodating space 25 is sealed from the outside by the first seal material 11 and the second seal material 12. By sealing the cell accommodating space 25 from the outside, intrusion of foreign matter into the cell accommodating space 25 is suppressed, and deterioration of the battery cells 40 can be suppressed. Note that it is preferable that a seal material such as a foam seal is also provided in the gap between the through hole provided in the partition wall portion 85 and the signal line.

[0026] 1, the first opening 91 is detachably closed by a cover member 15. The cover member 15 may be firmly fixed to the front surface of the bulging portion 22 with a bolt or the like, or may be fixed by elastically fitting with resin, rubber, or the like. By closing the first opening 91 with the cover member 15 during transportation, the output terminal accommodating space 27 is closed, and it is possible to prevent foreign matter from entering the case 20. The cover member 15 is removed when the battery pack 10 is used.

[0027] It is preferable that the cover member 15 is fixed to the front surface of the bulge portion 22 via a sealing member. By using the sealing member, the sealing function can be improved and the output terminal accommodating space 27 can be more reliably sealed. The sealing member is, for example, a rubber seal.

[0028] The battery pack 10 thus configured does not include auxiliary devices such as a junction box that houses a contactor, a fuse, etc., and an ECU. Therefore, when the battery pack 10 is used alone, the junction box and / or the ECU may be connected to the battery pack 10 via the connection box 200 or by a cable or the like. When a plurality of battery packs 10 are used, the battery packs 10 may be electrically connected to each other via the connection box 200, and the junction box and / or the ECU may be connected to the connection box 200. The junction box and / or the ECU may be built into the connection box 200, and the plurality of battery packs 10 may be connected to the junction box and / or the ECU within the connection box. The connection box 200 will be described later.

[0029] The upper surface of the case cover 23 is preferably a flat surface or has a fitting shape that fits with the bottom wall portion 88 of the case body 21. This allows the case 20 to be stacked vertically when the device to be mounted requires two or more battery packs 10. For example, it is envisioned that the battery packs 10 will be stacked in about five stages for use as a stationary type.

[0030] In the above embodiment, only the positive bus bar 62 and the negative bus bar 63 of the output conductive member 61 extend from the cell accommodating space 25 to the terminal block 60 of the output terminal accommodating space 27. However, as shown in Fig. 5, the midpoint bus bars 64, 65 may extend from the cell accommodating space 25. The midpoint bus bars 64, 65 are interposed in the middle of the multiple battery cells 40 connected in series, and are fastened to the terminal block 60 with bolts to establish electrical continuity in the series circuit. Therefore, when fastening the output conductive member 61 (positive bus bar 62, negative bus bar 63) to the extraction conductive member 70 (positive bus bar 72, negative bus bar 73), the bolts on the midpoint bus bars 64, 65 can be removed to prevent accidental short circuiting.

[0031] Next, a battery pack mounting structure in which four battery packs 10 are mounted under the floor of a vehicle will be described with reference to Figures 6 to 9. In the following description, the front-rear direction, left-right direction (vehicle width direction), and up-down direction are defined based on the vehicle.

[0032] In this mounting structure, as shown in Fig. 6, a central frame 120 extending in the vehicle width direction is fixed between a left side frame 110L and a right side frame 110R extending in the front-rear direction of the vehicle. In addition, the two battery packs 10 described above are arranged side by side on the left and right in the space in front of the central frame 120, and the two battery packs 10 described above are arranged side by side on the left and right in the space behind the central frame 120. Hereinafter, this structure is referred to as a battery assembly 100.

[0033] [Battery Assembly] In the battery assembly 100, the two front battery packs 10 are arranged so that the bulging portions 22 are located rearward and to the right, and the two rear battery packs 10 are arranged so that the bulging portions 22 are located forward and to the left. That is, the two front battery packs 10 and the two rear battery packs 10 are arranged in a state rotated 180° so that the bulging portions 22 face each other in the front-rear direction with the central frame 120 in between.

[0034] As shown in Figures 8 and 9, the central frame 120 of the battery assembly 100 is a hollow body with a rectangular cross-section, and is fastened to the left side frame 110L and the right side frame 110R by flange portions 127 extending in the front-to-rear direction formed on the left and right ends.

[0035] Two front communication holes 121a are formed in the front surface 121 of the central frame 120, each of which communicates with a first opening 91 formed in the bulging portion 22 of the front battery pack 10. Similarly, two rear communication holes 122a are formed in the rear surface 122 of the central frame 120, each of which communicates with a first opening 91 formed in the bulging portion 22 of the rear battery pack 10.

[0036] Fastening portions 123 for fastening the corresponding battery packs 10 in a liquid-tight manner are provided around the front communication holes 121a and the rear communication holes 122a, and each battery pack 10 is fixed to the central frame 120 by, for example, bolt fastening. As shown in Fig. 8, the central frame 120 has fastening portions 123 on the front surface 121 and the rear surface 122, respectively, and the front surface 121 and the rear surface 122 protrude upward and downward, so that a cross section cut in the front-to-rear direction has a highly rigid cross-sectional shape like an H-shaped steel beam.

[0037] From the output terminal accommodating space 27 formed in the bulging portion 22 of each battery pack 10, the output conductive member 70 enters the hollow region 125 of the central frame 120 through the first opening 91. As described above, the terminal block 60 of the battery pack is offset in the left-right direction with respect to the center line L, so that the terminal block 60 of the front battery pack 10 and the terminal block 60 of the rear battery pack 10 are offset in the left-right direction. As a result, the output conductive member 70 that is connected to the bus bar unit 140 from the terminal block 60 of the front battery pack 10 through the front communication hole 121a and the output conductive member 70 that is connected to the bus bar unit 140 from the terminal block 60 of the rear battery pack 10 through the rear communication hole 122a are offset in the vehicle width direction. Therefore, the output conductive member 70 extending from the front battery pack 10 and the output conductive member 70 extending from the rear battery pack 10 do not interfere with each other in the hollow region 125 of the central frame 120.

[0038] A busbar unit 140 is disposed in the hollow region 125 of the central frame 120 as shown in Fig. 7. The busbar unit 140 includes, for example, a plurality of connecting busbars, and electrically connects the four battery packs 10 in series as shown by the arrows in Fig. 9. The central frame 120 is an example of the connection box 200 described above.

[0039] A bottom opening 124 is provided on the rear surface of the central frame 120, and the bottom opening 124 is liquid-tightly closed by a bottom cover 126 via a seal member 14 (see FIG. 9). Since the bottom opening 124 of the central frame 120 is liquid-tightly closed by the bottom cover 126 and the communication holes 121a, 122a of the central frame 120 and the first opening 91 of each battery pack 10 are liquid-tightly fastened to each other, intrusion of moisture from the outside into the output terminal accommodating space 27 of the battery pack 10 and the internal space of the central frame 120 is restricted. The output conductive member 70 extending from each battery pack 10 to the hollow region 125 of the central frame 120 is fastened to the bus bar unit 140 from the bottom opening 124 with the bottom cover 126 removed.

[0040] The battery assembly 100 configured in this manner is fixed to the frame members of the vehicle by a pair of central supports 128 provided on the central frame 120 shown in FIG. 8 and side supports 111 provided on the left side frame 110L and the right side frame 110R shown in FIG. 65, and is placed under the floor of the vehicle.

[0041] 10 is a side view of a four-wheeled vehicle 301 in which the battery assembly 100 is disposed under the floor. The four-wheeled vehicle 301 is configured to be operable by driving a motor (not shown) with electric power from the battery pack 10. The four-wheeled vehicle may be a hybrid vehicle, an electric vehicle, or a fuel cell vehicle. The battery pack 10 can be mounted not only on four-wheeled vehicles, but also on various other devices such as vehicles such as two-wheeled vehicles and three-wheeled vehicles, working machines such as lawnmowers and soil compactors, and electric battery units.

[0042] FIG. 11 is a side view of a two-wheeled vehicle 302 on which the battery assembly 100A is mounted. The battery assembly 100A includes battery packs 10 stacked in two levels, one above the other, and a connection box 200 disposed in front of the two battery packs 10 and electrically connecting the two battery packs 10. The two-wheeled vehicle 302 is configured to be operable by driving a motor (not shown) with electric power from the battery packs 10.

[0043] FIG. 12 is a side view of a lawnmower 303 equipped with the battery assembly 100A. The lawnmower 303 rotates the blades by driving a motor (not shown) with the power of the battery pack 10. Note that the power of the battery pack 10 may be used to drive the wheels in addition to rotating the blades.

[0044] FIG. 13 is a side view of the transport vehicle 304 on which the battery assembly 100A is mounted. The transport vehicle 304 is configured to be automatically operable by driving a motor (not shown) using power from the battery pack 10.

[0045] FIG. 14 is a side view of the electric power unit 305 on which the battery assembly 100B is mounted. The battery assembly 100B includes one battery pack 10 and a connection box 200 disposed in front of the battery pack 10. An electric power unit 305 drives a motor 306 using electric power from the battery pack 10. Note that the electric power unit 305 may be a separate type electric power unit in which the battery pack 10 and the motor 306 are separate bodies, or may be an integrated type electric power unit in which the battery pack 10 and the motor 306 are housed in a single case and integrated together.

[0046] The number of battery packs 10 included in the battery assemblies 100, 100A, 100B is not limited as long as the battery assemblies 100, 100A, 100B include one or more battery packs 10. In addition to the above examples, the battery packs 10 may be used as a stationary battery in which a plurality of battery packs are stacked. The battery assemblies 100, 100A, 100B and / or the stationary battery may include a recycled or reused battery pack 10 that has been used for other purposes. By using the battery packs 10 that have been used for other purposes, the number of battery packs 10 to be discarded can be reduced, and resources can be used effectively.

[0047] Although various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present invention. Furthermore, the components in the above-mentioned embodiments may be arbitrarily combined within the scope of the invention.

[0048] For example, the battery pack 10 may be provided with a water jacket either integrally with the bottom wall portion 88 or separately.

[0049] This specification describes at least the following items. Note that, in parentheses, components corresponding to those in the above-mentioned embodiment are shown, but the present invention is not limited to these.

[0050] (1) A cell stack (cell stack 30) in which a plurality of battery cells (battery cells 40) are stacked; A battery pack (battery pack 10) comprising: a case (case 20) in which the cell stack is housed; The case is A cell accommodating space (cell accommodating space 25) in which the cell stack is accommodated and which is closed from the outside; an output terminal accommodating space (output terminal accommodating space 27) in which a conductive member (output conductive member 61) extending from the cell accommodating space and an external conductive member (extraction conductive member 70) entering from an opening (first opening 91) are connected; and a cover member (cover member 15) that detachably closes the opening. Battery pack.

[0051] According to (1), by connecting the external conductive member that enters the output terminal accommodating space from the opening to the conductive member, the battery pack can be mounted on various devices. Also, by closing the output terminal accommodating space with a lid member when transporting the battery pack, it is possible to prevent foreign objects from entering the case.

[0052] (2) A battery pack according to (1), A seal member (second seal member 12) is provided at a communication portion between the cell accommodating space and the output terminal accommodating space, The cell storage space is sealed. Battery pack.

[0053] According to (2), by sealing the cell storage space, deterioration of the battery cells can be suppressed even when the cover member is not attached.

[0054] (3) A battery pack according to (1) or (2), The conductive member and the external conductive member are configured to be electrically connectable by a bolt. Battery pack.

[0055] According to (3), it is highly versatile and can be installed in a variety of devices.

[0056] (4) A battery pack according to any one of (1) to (3), A terminal block (terminal block 60) to which the conductive member and the external conductive member are connected is offset in the width direction with respect to a center line (center line L) in the width direction of the battery pack. Battery pack.

[0057] According to (4), by arranging the battery packs in a state rotated 180 degrees so as to face each other in the front-rear direction, the position of the terminal block can be offset, which makes it possible to suppress interference with an external conductive member that extends from the terminal block of the battery pack and is connected to the conductive member.

[0058] (5) A battery pack according to any one of (1) to (4), The top surface of the case has a flat surface or a fitting shape that fits with the bottom surface of the case, The case is configured to be stackable in the vertical direction. Battery pack.

[0059] According to (5), multiple battery packs can be mounted in a stacked state depending on the device.

[0060] (6) A battery pack according to any one of (1) to (5), The vehicle is equipped with an electric power unit (electric power unit 305) that drives a motor using the power of the battery pack. Battery pack.

[0061] According to (6), it can be used as a battery for an electric power unit that can be used as a power source for a work machine.

[0062] (7) A battery pack according to any one of (1) to (5), The battery pack is powered by a motor to drive the transport vehicle (transport vehicle 304), and the transport vehicle is mounted on the transport vehicle (transport vehicle 304). Battery pack.

[0063] According to (7), it can be used as a battery for a transport cart that transports items.

[0064] (8) A battery pack according to any one of (1) to (5), The battery pack is used to drive a motor to rotate a blade. The battery pack is used to drive a motor ... motor is mounted on a lawnmower (lawnmower 303) that rotates a blade. Battery pack.

[0065] According to (8), it can be used as a battery for a lawnmower.

[0066] (9) A battery pack according to any one of (1) to (5), The vehicle is mounted on a two-wheeled vehicle (two-wheeled vehicle 302) that can be driven by driving a motor using the power of the battery pack. Battery pack.

[0067] According to (9), it can be used as a battery for electric motorcycles.

[0068] (10) A battery pack according to any one of (1) to (5), The vehicle is mounted on a four-wheeled vehicle (four-wheeled vehicle 301) that can be driven by driving a motor using the power of the battery pack. Battery pack.

[0069] According to (10), it can be used as a battery for electric vehicles.

[0070] (11) A battery pack according to any one of (1) to (5), A plurality of the battery packs are stacked and mounted on a stationary battery. Battery pack.

[0071] According to (11), it can be used as a stationary battery.

[0072] (12) The battery pack according to (11), The stationary battery includes a battery pack that has been used for another purpose. Battery pack.

[0073] According to (12), used battery packs can be reused for other purposes, the number of battery packs to be discarded can be reduced, and resources can be used effectively. [Explanation of symbols]

[0074] 10 Battery pack 12 Second seal material (sealing member) 15 Lid member 20 cases 25 Cell Containment Space 27 Output terminal housing space 30 Cell stack 40 Battery Cells 60 terminal block 61 Output conductive member (conductive member) 70 Extraction conductive member (external conductive member) 91 First opening (opening) 301 Four-wheeled vehicle 302 Motorcycle 303 Lawnmower 304 Transport Trolley 305 Electric Power Unit L Center line of battery pack

Claims

1. A cell stack in which a plurality of battery cells are stacked; A battery pack comprising: a case in which the cell stack is housed; The case is a cell accommodating space that accommodates the cell stack and is closed from the outside; an output terminal accommodating space in which a conductive member extending from the cell accommodating space and an external conductive member entering through an opening are connected; A cover member that detachably closes the opening. Battery pack.

2. 2. The battery pack according to claim 1, a seal member is provided at a communication portion between the cell accommodating space and the output terminal accommodating space, The cell storage space is sealed. Battery pack.

3. 2. The battery pack according to claim 1, The conductive member and the external conductive member are configured to be electrically connectable by a bolt. Battery pack.

4. 2. The battery pack according to claim 1, a terminal block to which the conductive member and the external conductive member are connected is offset in a width direction with respect to a center line in the width direction of the battery pack; Battery pack.

5. 2. The battery pack according to claim 1, The top surface of the case has a flat surface or a fitting shape that fits with the bottom surface of the case, The case is configured to be stackable in the vertical direction. Battery pack.

6. 6. The battery pack according to claim 1, The battery pack is mounted on an electric power unit that drives a motor using the electric power of the battery pack. Battery pack.

7. 6. The battery pack according to claim 1, The battery pack is mounted on a transport vehicle that can move by driving a motor using the power of the battery pack. Battery pack.

8. 6. The battery pack according to claim 1, The battery pack is electrically powered to drive a motor to rotate a lawnmower. Battery pack.

9. 6. The battery pack according to claim 1, The battery pack is mounted on a two-wheeled vehicle that can be driven by driving a motor using the power of the battery pack. Battery pack.

10. 6. The battery pack according to claim 1, The battery pack is mounted on a four-wheeled vehicle that can be driven by driving a motor using the power of the battery pack. Battery pack.

11. 6. The battery pack according to claim 1, A plurality of the battery packs are stacked and mounted on a stationary battery. Battery pack.

12. 12. The battery pack of claim 11, The stationary battery includes a battery pack that has been used for another purpose. Battery pack.

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