Moving body

Abstract

A mobile body capable of suppressing reduction in battery mounting density in a battery case is provided. A mobile body (1) includes: first and second battery modules (2A, 2B) stacked in a first direction by a plurality of battery cells (21); a battery case (3) that houses the battery modules (2A, 2B); a charger (4) that charges the battery modules (2A, 2B); loads (6A, 6B); and a battery control device (7) that controls the battery modules (2A, 2B). The first and second battery modules (2A, 2B) are arranged in the first direction and electrically connected in parallel to the loads (6A, 6B) and the charger (4). The battery control device (7) prohibits charging of one of the battery modules (2A, 2B) when charging of the other of the battery modules (2A, 2B) is performed.

Description

TECHNICAL FIELD

[0001] The present application relates to a mobile body. BACKGROUND

[0002] In recent years, as a specific countermeasure against global climate change, initiatives toward realization of a low-carbon society or a decarbonized society are very active. In a mobile body such as a vehicle, there is also a strong demand for reduction in the amount of CO2 emission, and electrification of a drive source is also rapidly progressing. Specifically, development of a vehicle such as an electrical vehicle (EV) or a hybrid electrical vehicle (HEV) that has an electric motor as a drive source of the vehicle and a battery as a secondary battery that can supply electric power to the electric motor is being promoted.

[0003] In order to increase the distance that such a vehicle can travel, the battery pack is being made larger (for example, Patent Literature 1), and in addition, attempts are being made to mount battery cells and / or battery modules as much as possible inside the case in order to increase the battery mounting density inside the case.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent Application Publication No. 2018-193026 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] However, the volume of a battery cell expands and shrinks depending on the charge capacity. Therefore, the battery module expands when the battery is charged, and the battery module shrinks when the battery is discharged. This tendency is particularly significant in an all-solid battery that uses a solid electrolyte.

[0009] Therefore, when the battery module is arranged inside the case in an initial state, it is necessary to sufficiently separate the battery module from the wall surface of the case, and the mounting density of the battery cells and / or the battery modules with respect to the battery case can decrease.

[0010] The present application provides a mobile body that can suppress a decrease in the mounting density of a battery inside a battery case.

[0011] MEANS FOR SOLVING THE PROBLEMS

[0012] The present application relates to a mobile body that has:

[0013] a first battery module and a second battery module that are each formed by stacking a plurality of battery cells in a first direction;

[0014] a battery housing that houses the first battery module and the second battery module;

[0015] a charger that charges the first battery module and the second battery module;

[0016] a load; and

[0017] a battery control device that controls the first battery module and the second battery module,

[0018] wherein the first battery module and the second battery module are arranged in the first direction,

[0019] the first battery module and the second battery module are electrically connected in parallel to the load and the charger,

[0020] the battery control device prohibits charging of the other one of the first battery module and the second battery module in a case where charging of either one of the first battery module and the second battery module is performed.

[0021] Further, the present application relates to a mobile body that includes:

[0022] a battery housing that houses a plurality of battery cells stacked in a first direction;

[0023] a charger that charges the plurality of battery cells;

[0024] a load; and

[0025] a battery control device that controls the plurality of battery cells,

[0026] wherein the plurality of battery cells include a first battery cell group arranged in a first region and a second battery cell group arranged in a second region, the first battery cell group and the second battery cell group being adjacent in the first direction,

[0027] the first battery cell group and the second battery cell group are electrically connected in parallel to the load and the charger,

[0028] the battery control device prohibits charging of the other one of the first battery cell group and the second battery cell group in a case where charging of either one of the first battery cell group and the second battery cell group is performed.

[0029] Further, the present application relates to a mobile body that includes:

[0030] at least three battery modules each of which is formed by stacking a plurality of battery cells in a first direction;

[0031] a battery housing for housing the at least three battery modules;

[0032] a charger for charging the at least three battery modules;

[0033] load; and

[0034] a battery control device, which controls the at least three battery modules;

[0035] The at least three battery modules are arranged in the first direction.

[0036] The at least three battery modules are electrically connected in parallel with the load and the charger,

[0037] When at least one battery module among the at least three battery modules is charged, the battery control device discharges at least one battery module among the remaining battery modules.

[0038] Effects of the Invention

[0039] According to the present invention, it is possible to suppress a decrease in the battery loading density in the battery case. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a circuit block diagram showing a schematic configuration of a moving object 1 according to one embodiment of the present invention.

[0041] Figure 2 It is an explanatory diagram showing a state in which the first battery block 2A is charged by the charger 4 .

[0042] Figure 3 1 is an explanatory diagram showing a state in which the first battery module 2A is charged by the charger 4 and the second battery module 2B is discharged to the second load 6B.

[0043] Figure 4 1 is an explanatory diagram showing a state in which the first battery module 2A is charged by the quick charger and the second battery module 2B is discharged to the second load 6B.

[0044] Figure 5 1 is an explanatory diagram showing a state in which the first battery module 2A is discharging to the first load 6A, and the second battery module 2B is being charged by the first battery module 2A.

[0045] Figure 6 1 is an explanatory diagram showing a state in which discharge from the first battery module 2A and the second battery module 2B to the second load 6B occurs when a collision of the moving object 1 is detected or predicted.

[0046] Figure 7is an explanatory view obtained by schematizing the relationship between the charging capacities of the first and second battery modules 2A and 2B and the gap within the battery case 3.

[0047] Figure 8 is a circuit block diagram showing the outline structure of the mobile body 1 of the first modification example.

[0048] Figure 9 is a schematic front view showing the structure within the battery case 3 of the mobile body 1 of Figure 8

[0049] Figure 10 is a circuit block diagram showing the outline structure of the mobile body 1 of the second modification example.

[0050] Figure 11 is an explanatory view explaining the gap between the battery case 3 and the battery modules 2A and 2B.

[0051] BRIEF DESCRIPTION OF DRAWINGS

[0052] 1 mobile body

[0053] 2A first battery module

[0054] 2B second battery module

[0055] 2C first battery cell group

[0056] 2D second battery cell group

[0057] 2E third battery module

[0058] 21 battery cell

[0059] 22 elastic body

[0060] 3 battery case

[0061] 4 charger

[0062] 6A first load

[0063] 6B second load

[0064] 7 battery control device

[0065] 71 sensor device DETAILED DESCRIPTION

[0066] Hereinafter, a mobile body according to one embodiment of the present application will be described with reference to Figures 1 to 7 to one embodiment of the present application will be described.

[0067] The mobile body 1 of one embodiment of the present application is, for example, an electric vehicle that travels with the power of a motor, like Figure 1 ​As shown, it is provided with a battery module group 2, a battery case 3, a charger 4, a normal charging terminal 5A, a quick charging terminal 5B, a first load 6A, a second load 6B, a battery control device (CTR) 7, and the like. The battery module group 2 of the present embodiment includes a plurality of (three in the present embodiment) first battery modules 2A electrically connected in series and a plurality of (three in the present embodiment) second battery modules 2B electrically connected in series.

[0068] The battery case 3 houses the battery module group 2, that is, the three first battery modules 2A and the three second battery modules 2B in the present embodiment. In addition, the number of the first battery modules 2A and the second battery modules 2B can be one or two, or four or more.

[0069] The first battery modules 2A and the second battery modules 2B are each configured by stacking a plurality of battery cells 21 in a first direction. In addition, the first battery modules 2A and the second battery modules 2B are arranged in a row in the first direction, and configured so that the length in the first direction becomes longer due to expansion of the battery cells 21 and becomes shorter due to contraction of the battery cells 21. In other words, the first battery modules 2A and the second battery modules 2B are arranged so that the stacking direction of the plurality of battery cells 21 is the same direction, and are arranged in the stacking direction.

[0070] In addition, the first battery modules 2A and the second battery modules 2B are electrically connected in parallel to the first load 6A, the second load 6B, the charger 4, and the quick charging terminal 5B.

[0071] If the electrical connection structure is specifically described, the first battery modules 2A are connected to the first load 6A via a connection path CA1, connected to the second load 6B via a connection path CA2, connected to the charger 4 via a connection path CA3 in which a first switch SW1 is present, and connected to the quick charging terminal 5B via a connection path CA4 in which a third switch SW3 is present. In addition, the second battery modules 2B are connected to the first load 6A via a connection path CB1, connected to the second load 6B via a connection path CB2, connected to the charger 4 via a connection path CB3 in which a second switch SW2 is present, and connected to the quick charging terminal 5B via a connection path CB4 in which a fourth switch SW4 is present. Further, the battery modules 2A, 2B are connected to each other via a connection path C5.

[0072] The first battery module 2A and the second battery module 2B of this embodiment are constructed using, for example, all-solid-state batteries. Although not shown in the figure, the all-solid-state battery has an all-solid-state battery positive electrode, an all-solid-state battery negative electrode, and a solid electrolyte disposed between the all-solid-state battery positive electrode and the all-solid-state battery negative electrode. The all-solid-state battery is charged and discharged by exchanging lithium ions between the all-solid-state battery positive electrode and the all-solid-state battery negative electrode via the solid electrolyte. As a solid electrolyte, there is no particular limitation as long as it has lithium ion conductivity and insulation properties, and materials commonly used in all-solid-state lithium-ion batteries can be used. For example, sulfide solid electrolyte materials, oxide solid electrolyte materials, inorganic solid electrolytes containing lithium salts, etc.; polymer solid electrolytes such as polyethylene oxide; gel-type solid electrolytes containing lithium salts and lithium ion conductive ionic liquids, etc. There is no particular limitation on the form of the solid electrolyte material, and for example, a particulate form can be used.

[0073] like Figure 1 As shown, preferably, an elastic body 22 is sandwiched between the first battery module 2A and the second battery module 2B arranged along the first direction within the battery case 3. According to this elastic body 22, even if the first battery module 2A and the second battery module 2B expand and contract in the first direction corresponding to charging and discharging, the elastic body 22 can maintain the restrained state (pressed state) of the first battery module 2A and the second battery module 2B.

[0074] A gap is ensured between the battery case 3 and the battery modules 2A, 2B. The gap in the first direction is set in consideration of the expansion and contraction of the battery modules 2A, 2B in response to charge and discharge.

[0075] For example, Figure 11 As shown on the left side of the diagram, the gap in the first direction is set so that the loading density of the battery modules 2A and 2B is appropriate when the battery modules 2A and 2B are in the initial state (the charging capacity SOC is about 75%). In this case, the expansion of the all-solid-state battery due to charging will increase. Therefore, Figure 11 As shown in the middle of the figure, when both battery modules 2A and 2B are in a fully charged state (the charging capacity SOC is 100%), the battery modules 2A and 2B may interfere with the battery case 3. Figure 11 As shown on the right side of , although the gap in the first direction is increased, the battery loading density will be reduced. The present invention reduces the gap in the first direction through the control described below, thereby suppressing the reduction in the battery loading density in the battery case 3.

[0076] The charger 4 is a vehicle-mounted charger mounted on the mobile body 1, and charges the battery modules 2A, 2B by converting an alternating-current 100 V power source of a household, which is connected to the normal charging terminal 5A, into a direct-current voltage of a prescribed voltage. The battery modules 2A, 2B to be charged by the charger 4 can be selected by switching of the first switch SW1 and the second switch SW2.

[0077] The quick charging terminal 5B is connected to a quick charger (not shown) provided outside the mobile body 1. The battery modules 2A, 2B to be charged by the quick charger can be selected by switching of the third switch SW3 and the fourth switch SW4.

[0078] The first load 6A is, for example, a motor that causes the mobile body 1 to travel, and the second load 6B is, for example, an air conditioning device, a sound device, a light, or the like of the mobile body 1.

[0079] The battery control device 7 controls charging and discharging of the battery modules 2A, 2B. The battery control device 7 of the present embodiment adjusts expansion and shrinkage of the battery modules 2A, 2B based on the charging and discharging control of the battery modules 2A, 2B, whereby the gap in the first direction between the battery housing 3 and the battery modules 2A, 2B can be reduced, and reduction in the battery mounting density can be suppressed. Hereinafter, the specific control content of the battery control device 7 will be described with reference to the drawings. Figures 2 to 7 The specific control content of the battery control device 7 will be described.

[0080] In a case where either one of the first battery module 2A and the second battery module 2B is charged by the charger 4, the battery control device 7 prohibits charging of the other one of the first battery module 2A and the second battery module 2B. Specifically, as shown in FIG. 2, in a case where the first battery module 2A is charged, the battery control device 7 prohibits charging of the second battery module 2B. In this way, even if the first battery module 2A expands, the second battery module 2B does not expand. Also, in a case where the second battery module 2B is charged, the battery control device 7 prohibits charging of the first battery module 2A. Figure 2 Figure 2 In the following examples, a case where the first battery module 2A is charged is exemplified, but of course, the second battery module 2B can be charged instead of the first battery module 2A.

[0081] Accordingly, expansion of the battery modules 2A, 2B in the first direction is suppressed, and thus the gap in the first direction between the battery modules 2A, 2B and the battery housing 3 can be reduced. Accordingly, reduction in the battery mounting density in the battery housing 3 can be suppressed. This control is particularly effective in the case of a full-solid battery having a large amount of expansion.

[0082] Preferably, in a case where one of the battery modules 2A, 2B is charged by the charger 4, the battery control device 7 discharges the other one of the battery modules 2A, 2B. Specifically, as shown in FIG. 2, in a case where the first battery module 2A is charged, the battery control device 7 discharges the second battery module 2B. In this way, even if the first battery module 2A expands, the second battery module 2B does not expand. Also, in a case where the second battery module 2B is charged, the battery control device 7 discharges the first battery module 2A.​Figure 3 As shown, while charging the first battery module 2A, the battery control device 7 controls the second battery module 2B to discharge the battery to the second load 6B. This allows the second battery module 2B to contract, even if the first battery module 2A expands. This further suppresses expansion of the battery modules 2A and 2B in the first direction. Consequently, the gap in the first direction between the battery modules 2A and 2B and the battery case 3 can be further reduced.

[0083] Preferably, when one of the battery modules 2A and 2B is charged by a fast charger, the battery control device 7 controls the other battery module 2A and 2B to discharge. Figure 4 As shown, during rapid charging of the first battery module 2A, the battery control device 7 controls discharge from the second battery module 2B to the second load 6B. Thus, even if the first battery module 2A expands during rapid charging, the second battery module 2B contracts, further suppressing expansion of the battery modules 2A and 2B in the first direction. Consequently, the gap in the first direction between the battery modules 2A and 2B and the battery case 3 can be further reduced.

[0084] Preferably, when one of the battery modules 2A and 2B is discharged (for example, when the vehicle is traveling), the battery control device 7 supplies power from one of the battery modules 2A and 2B to the other of the battery modules 2A and 2B via the connection path C5, thereby charging the other of the battery modules 2A and 2B. Specifically, Figure 5 As shown, when discharging from the first battery module 2A to the first load 6A (for example, when the vehicle is traveling), the battery control device 7 supplies power from the first battery module 2A to the second battery module 2B via the connection path C5, thereby charging the second battery module 2B. This allows the expansion of the other battery module 2A or 2B to offset the contraction of one of the battery modules 2A or 2B. This prevents a reduction in the restraining force caused by excessive contraction of the battery modules 2A or 2B.

[0085] like Figure 1 As shown in FIG. 1 , a sensor device 71 for detecting or predicting a collision of the mobile body 1 may also be provided on the mobile body 1. Figure 6 As shown, preferably, when the sensor device 71 detects or predicts a collision of the mobile object 1, the battery control device 7 causes the first battery module 2A and the second battery module 2B to discharge energy into the second load 6B. This allows the battery modules 2A and 2B to contract during a collision, thereby increasing the gap and reducing the stress acting on the battery modules 2A and 2B.

[0086] Furthermore, the battery control device 7 preferably monitors the charge capacities of the first and second battery modules 2A, 2B and controls the charge and discharge of the first and second battery modules 2A, 2B based on the charge capacities. Specifically, by monitoring the charge capacities, the battery control device 7 can estimate the amount of expansion and contraction of the battery modules 2A, 2B and appropriately control the charge and discharge of the battery modules 2A, 2B.

[0087] For example, Figure 7 As shown, the battery control device 7 controls the charge and discharge of the first battery module 2A and the second battery module 2B in such a manner that the sum of the charge capacity of the first battery module 2A and the charge capacity of the second battery module 2B is less than a predetermined value (e.g., 150%). Figure 7 As shown on the left side of the diagram, the charge capacity of both devices is set to 75%, or as shown on the left side of the diagram, the charge capacity of both devices is set to 75%. Figure 7 As shown in the middle of the figure, set one charge capacity to 100% and the other charge capacity to 50%. Figure 7 As shown on the right side of FIG, the charge capacity of both is set to 50%. This can limit the expansion of the first battery module 2A and the second battery module 2B arranged in the battery case 3 in the first direction, thereby preventing excessive stress from acting on the first battery module 2A and the second battery module 2B.

[0088] <First Modification>

[0089] Next, refer to Figure 8 and Figure 9 A first modified example of the embodiment of the present invention will be described. However, for the same configuration as that of the above embodiment, the description of the above embodiment may be cited using the same reference numerals as those of the above embodiment.

[0090] exist Figure 8 The first modified example shown differs from the above-described embodiment in that, rather than forming a battery module from a plurality of battery cells 21 stacked in the first direction, the plurality of battery cells 21 stacked in the first direction are treated as a first battery cell group 2C arranged in a first region and a second battery cell group 2D arranged in a second region, with the first battery cell group 2C and the second battery cell group 2D adjacent to each other in the first direction. The electrical connection structure, for example, the parallel electrical connection of the first and second battery cell groups 2C, 2D to the loads 6A and 6B and the charger 4, is the same as that of the first and second battery modules 2A, 2B in the first embodiment.

[0091] like Figure 9As shown, among the plurality of battery cells 21 stacked in the first direction, the battery cells 21 located at both ends in the first direction are fixed to the lower plate 23 fixed to the bottom of the battery case 3, and the other battery cells 212 are allowed to displace in the first direction with respect to the lower plate 23. In this way, according to expansion and contraction of the battery cells 21 accompanying charge and discharge, the battery cells 21 displace in the first direction, and thus it is possible to reduce stress acting on the battery cells 21. Preferably, an elastic body 22 is present between a first battery cell group 2C disposed in the first region and a second battery cell group 2D disposed in the second region, the first battery cell group 2C and the second battery cell group 2D being adjacent in the first direction.

[0092] In a case where any one of the first battery cell group 2C and the second battery cell group 2D is charged, the battery control device 7 prohibits charging of the other of the first battery cell group 2C and the second battery cell group 2D. In such a first modified example as well, it is possible to reduce the gap between the battery cells 21 and the battery case 3, and suppress reduction in the battery mounting density.

[0093] <Second Modified Example>

[0094] Next, the second modified example of the embodiment of the application will be described with reference to Figure 10 A second modified example of the embodiment of the application will be described.

[0095] In the above-described embodiment, the number of battery modules arranged in series in the first direction within the battery case 3 is two, but in the second modified example, the number of battery modules arranged in series in the first direction is three.

[0096] In the present modified example, the battery module group 2 includes a plurality of (three in the present embodiment) first battery modules 2A electrically connected in series, a plurality of (three in the present embodiment) second battery modules 2B electrically connected in series, and a plurality of (three in the present embodiment) third battery modules 2E electrically connected in series. In addition, the number of the first battery modules 2A, the second battery modules 2B, and the third battery modules 2E can be one or two, or four or more.

[0097] Although not shown, the first battery modules 2A, the second battery modules 2B, and the third battery modules 2E are electrically connected in parallel with the first load 6A, the second load 6B, the charger 4, and the terminal 5B for rapid charging. In a case where at least one of the three battery modules is charged, the battery control device 7 discharges at least one of the remaining battery modules. Thereby, it is possible to reduce the gap between the battery modules and the battery case, and suppress reduction in the battery mounting density. In addition, the number of battery modules arranged in series in the first direction can also be four or more.

[0098] The above-described various embodiments have been described with reference to the drawings, but the present application is of course not limited to these examples. It is obvious that a person skilled in the art can conceive various modifications or corrections within the scope recited in the claims, and it should be understood that these modifications and corrections also belong to the technical scope of the present application. Furthermore, the constituent elements in the above-described embodiments can be arbitrarily combined within the scope of the gist of the present application.

[0099] For example, in the above-described embodiments, a full solid-state battery using a solid electrolyte is exemplified, but is not limited thereto, and can be applied to a secondary battery using an electrolytic solution.

[0100] In the present specification, at least the following matters are described. In addition, the corresponding constituent elements and the like in the above-described embodiments are shown in parentheses, but are not limited thereto.

[0101] (1) A mobile body (mobile body 1) including:

[0102] a first battery module (first battery module 2A) and a second battery module (second battery module 2B) each of which is formed by stacking a plurality of battery cells (battery cell 21) in a first direction;

[0103] a battery case (battery case 3) that accommodates the first battery module and the second battery module;

[0104] a charger (charger 4) that charges the first battery module and the second battery module;

[0105] a load (load 6A); and

[0106] a battery control device (battery control device 7) that controls the first battery module and the second battery module,

[0107] wherein the first battery module and the second battery module are arranged in the first direction,

[0108] the first battery module and the second battery module are electrically connected in parallel to the load and the charger,

[0109] the battery control device prohibits charging of the other one of the first battery module and the second battery module when charging of either one of the first battery module and the second battery module is performed.

[0110] According to (1), taking into account the characteristic of battery cells expanding during charging, when charging one of the battery modules arranged along the stacking direction of the battery cells within the battery housing, charging of the other battery module is prohibited, thereby suppressing the expansion of the first and second battery modules in the first direction. As a result, the gap between the battery module and the battery housing can be reduced, and the reduction in the battery packing density within the battery housing can be suppressed.

[0111] (2) The moving object according to (1), wherein

[0112] The first battery module and the second battery module have a solid electrolyte.

[0113] According to (2), since the expansion amount of the battery cell of the all-solid-state battery is large during charging, the gap can be reduced more effectively.

[0114] (3) The moving object according to (1) or (2), wherein

[0115] When charging the one battery module, the battery control device discharges the other battery module.

[0116] According to (3), taking into account the characteristics of battery cells that expand during charging and contract during discharging, when charging one battery module, the other battery module is discharged, thereby further suppressing the expansion of the first battery module and the second battery module in the first direction and further reducing the gap.

[0117] (4) The moving object according to (1) or (2), wherein

[0118] When discharging the one battery module, the battery control device supplies power from the one battery module to the other battery module to charge the other battery module.

[0119] According to (4), taking into account the characteristics of battery cells that expand during charging and contract during discharging, when one battery module is discharged, the other battery module is charged, thereby suppressing the reduction in the restraint force caused by excessive contraction of the first battery module and the second battery module in the first direction.

[0120] (5) The mobile object according to any one of (1) to (4), wherein

[0121] An elastic body (elastic body 22 ) is sandwiched between the first battery module and the second battery module.

[0122] According to (5), the restrained state (pressed state) of the first battery module and the second battery module can be maintained by the elastic body.

[0123] (6) The moving body according to any one of (1) to (5), wherein

[0124] the moving body further includes a sensor device (sensor device 71) that detects or predicts a collision of the moving body,

[0125] the battery control device discharges the first battery module and the second battery module when a collision of the moving body is detected or predicted.

[0126] According to (6), the first battery module and the second battery module are discharged when a collision is detected or predicted, so that the battery modules are contracted, whereby stress acting on the first battery module and the second battery module can be reduced by the gap lowering effect.

[0127] (7) The moving body according to any one of (1) to (6), wherein

[0128] the battery control device monitors charge capacities of the first battery module and the second battery module, and controls charge and discharge of the first battery module and the second battery module on the basis of the charge capacities.

[0129] According to (7), the expansion amount and the contraction amount of the battery modules can be estimated by monitoring the charge capacities.

[0130] (8) The moving body according to (7), wherein

[0131] the battery control device controls charge and discharge of the first battery module and the second battery module in such a manner that the sum of the charge capacity of the first battery module and the charge capacity of the second battery module is equal to or less than a prescribed value.

[0132] According to (8), the sum of the charge capacity of the first battery module and the charge capacity of the second battery module arranged in the stacking direction of the battery cells is equal to or less than a prescribed value, whereby excessive stress can be prevented from acting on the first battery module and the second battery module arranged in the battery case.

[0133] (9) The moving body according to any one of (1) to (8), wherein

[0134] the moving body is configured to be connectable to a quick charger provided outside the moving body,

[0135] the battery control device controls the other battery module to be discharged in a case where the one battery module is charged by the quick charger.

[0136] According to (9), by controlling in a manner that another battery module is discharged when one battery module is rapidly charged, expansion of the first battery module and the second battery module in the first direction at the time of rapid charging is suppressed. Therefore, it is possible to reduce the gap between the battery module and the battery case, and it is possible to suppress a reduction in the battery mounting density within the battery case.

[0137] (10) A mobile body (mobile body 1) including:

[0138] a battery case (battery case 3) that houses a plurality of battery cells (battery cell 21) stacked in a first direction;

[0139] a charger (charger 4) that charges the plurality of battery cells;

[0140] a load (load 6A); and

[0141] a battery control device (battery control device 7) that controls the plurality of battery cells,

[0142] wherein the plurality of battery cells includes a first battery cell group (first battery cell group 2C) disposed in a first region and a second battery cell group (second battery cell group 2D) disposed in a second region, the first battery cell group and the second battery cell group being adjacent in the first direction,

[0143] the first battery cell group and the second battery cell group are electrically connected in parallel to the load and the charger,

[0144] in a case where the first battery cell group and the second battery cell group are charged, the battery control device prohibits charging of the other battery cell group of the first battery cell group and the second battery cell group.

[0145] According to (10), in consideration of the characteristics of the battery cells that expand at the time of charging, in a case where one of the battery cell groups arranged in the stacking direction of the battery cells within the case is charged, charging of the other battery cell group is prohibited, and expansion of the first battery cell group and the second battery cell group in the first direction is suppressed. Therefore, it is possible to reduce the gap between the battery cell group and the battery case, and it is possible to suppress a reduction in the battery mounting density within the battery case.

[0146] (11) A mobile body (mobile body 1) including:

[0147] at least three battery modules (battery module 2A, 2B, 2E) each of which is formed by stacking a plurality of battery cells (battery cell 21) in a first direction;

[0148] a battery case (battery case 3) that houses the at least three battery modules;

[0149] a charger (charger 4) that charges the at least three battery modules;

[0150] a load (load 6A); and

[0151] a battery control device (battery control device 7) that controls the at least three battery modules,

[0152] wherein the at least three battery modules are arranged in the first direction,

[0153] the at least three battery modules are electrically connected in parallel to the load and the charger,

[0154] in a case where at least one of the at least three battery modules is charged, the battery control device discharges at least one of the remaining battery modules.

[0155] According to (11), in a case where a plurality of battery modules are arranged in the stacking direction of the battery cells within the case, in consideration of the characteristics that the battery cells expand when charged, at least one of the remaining battery modules is discharged when at least one of the at least three battery modules is charged. Thereby, the gap between the battery modules and the battery case can be reduced, and the reduction in the battery mounting density within the battery case can be suppressed.

Claims

1. A mobile object comprising: A first battery module and a second battery module, each of which is formed by stacking a plurality of battery cells in a first direction; a battery housing for accommodating the first battery module and the second battery module; a charger for charging the first battery module and the second battery module; load; and a battery control device, which controls the first battery module and the second battery module, The first battery module and the second battery module are arranged in the first direction. The first battery module and the second battery module are electrically connected in parallel with the load and the charger, When charging any one of the first battery module and the second battery module, the battery control device prohibits charging the other of the first battery module and the second battery module. An elastic body is sandwiched between the first battery module and the second battery module.

2. The mobile object according to claim 1, wherein The first battery module and the second battery module have a solid electrolyte.

3. The mobile object according to claim 1 or 2, wherein: When charging the one battery module, the battery control device discharges the other battery module.

4. The mobile object according to claim 1 or 2, wherein: When discharging the one battery module, the battery control device supplies power from the one battery module to the other battery module to charge the other battery module.

5. The moving object according to claim 1 or 2, wherein: The mobile body further includes a sensor device for detecting or predicting a collision of the mobile body. The battery control device discharges the first battery module and the second battery module when a collision of the moving object is detected or predicted.

6. The moving object according to claim 1 or 2, wherein: The battery control device monitors charge capacities of the first battery module and the second battery module, and controls charge and discharge of the first battery module and the second battery module based on the charge capacities.

7. The moving object according to claim 6, wherein: The battery control device controls charging and discharging of the first battery module and the second battery module so that the sum of the charging capacity of the first battery module and the charging capacity of the second battery module is equal to or less than a predetermined value.

8. The moving object according to claim 1 or 2, wherein: The mobile body is configured to be connectable to a quick charger provided outside the mobile body. When the one battery module is charged by the quick charger, the battery control device controls the other battery module to discharge.

9. A mobile object comprising: a battery housing for accommodating a plurality of battery cells stacked in a first direction; a charger for charging the plurality of battery cells; load; and a battery control device that controls the plurality of battery cells; in, The plurality of battery cells include a first battery cell group arranged in a first area and a second battery cell group arranged in a second area, the first battery cell group and the second battery cell group being adjacent to each other in the first direction. The first battery cell group and the second battery cell group are electrically connected in parallel with the load and the charger, When charging is being performed on either one of the first battery cell group and the second battery cell group, the battery control device prohibits charging on the other of the first battery cell group and the second battery cell group.

10. A mobile object comprising: at least three battery modules, each of which is formed by stacking a plurality of battery cells in a first direction; a battery housing for housing the at least three battery modules; a charger for charging the at least three battery modules; load; and a battery control device, which controls the at least three battery modules; The at least three battery modules are arranged in the first direction. The at least three battery modules are electrically connected in parallel with the load and the charger, When at least one battery module among the at least three battery modules is charged, the battery control device discharges at least one battery module among the remaining battery modules.

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