Energy storage device

Abstract

To provide an energy storage device that can detect the presence of liquid inside the energy storage device with a simple configuration. [Solution] The energy storage device includes a plurality of energy storage modules each having a plurality of energy storage cells, a housing in which the plurality of energy storage modules are installed in parallel along a first direction, an inter-module busbar connecting two adjacent energy storage modules among the plurality of energy storage modules, and conductive terminal pieces extending downward from the inter-module busbar, with their tips facing the housing at a predetermined distance.

Description

Technical Field

[0001] The technology of the present disclosure relates to a power storage device.

Background Art

[0002] Patent Document 1 below describes a leakage determination system including a stacked cell module including a plurality of cells, a connector electrically connected to the cells, and a processor that determines whether the stacked cell module is leaking liquid based on an electrical signal input from the connector.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Vehicles, particularly battery electric vehicles (BEV) and hybrid electric vehicles (HEV), are equipped with large power storage devices. In such power storage devices, not only can the electrolyte in the power storage cells leak, but water can also enter from the outside. The presence of liquids such as the aforementioned electrolyte and water in the power storage device is highly related to the occurrence of short circuits and poor electrical conduction in the power storage device, so it is required to detect this.

[0005] In view of the above problems, an object of the present disclosure is to provide a power storage device capable of detecting the presence of liquid in the power storage device with a simple configuration.

Means for Solving the Problems

[0006] To achieve the above objective, the energy storage device according to claim 1 includes a plurality of energy storage modules each having a plurality of energy storage cells, a housing in which the plurality of energy storage modules are installed in parallel along a first direction, an intermodal busbar connecting two adjacent energy storage modules among the plurality of energy storage modules, and a conductive terminal piece extending downward from the intermodal busbar, with its tip facing the housing at a predetermined distance.

[0007] In the energy storage device according to claim 1, terminal pieces are provided inside the housing, allowing contact between the terminal pieces and liquid generated inside the housing due to leakage from the energy storage cells or intrusion of water from the outside. The terminal pieces are connected to the inter-module busbar, and contact between the terminal pieces and the liquid affects the output of the energy storage module, making it easy to detect the presence of liquid from the output, etc.

[0008] The energy storage device according to claim 2 further includes a monitoring device for monitoring electrical signals input from the plurality of energy storage modules, in the energy storage device described in claim 1.

[0009] In the energy storage device according to claim 2, it becomes possible to detect the liquid inside the housing within the energy storage device.

[0010] The energy storage device according to claim 3 is the energy storage device according to claim 1 or claim 2, further comprising a busbar connected to the plurality of energy storage modules and disposed on one side along a second direction intersecting the first direction of the plurality of energy storage modules, wherein the inter-module busbar is disposed on the other side along the second direction of the plurality of energy storage modules.

[0011] In the energy storage device of claim 3, since the inter-module busbars and busbars are positioned at different locations, the total length of each busbar required to connect multiple energy storage modules and multiple energy storage modules to the outside can be reduced. This improves space efficiency within the energy storage device and enables the provision of a compact, high-capacity energy storage device.

[0012] The energy storage device according to claim 4 is the energy storage device according to any one of claims 1 to 3, wherein the housing includes a receiving portion capable of storing liquid at a position opposite to the tip of the terminal piece.

[0013] In the energy storage device according to claim 4, the contact time between the terminal piece and the liquid can be increased, improving the accuracy of detecting the presence of the liquid. [Effects of the Invention]

[0014] According to the above-described energy storage device, it is possible to detect the presence of liquid inside the energy storage device with a simple configuration. [Brief explanation of the drawing]

[0015] [Figure 1] This is a schematic perspective view showing an example of a power storage device according to one embodiment. [Figure 2] Figure 1 is an exploded perspective view showing a magnified view of the main components of the energy storage device. [Figure 3] This is a magnified perspective view of the inter-module busbars shown in Figure 1. [Figure 4] This is a schematic cross-sectional view taken along line AA shown in Figure 1. [Modes for carrying out the invention]

[0016] The following describes various embodiments for implementing this disclosure with reference to the drawings. In the following, only the necessary parts for explaining the objectives of this disclosure are schematically shown, and the explanation will primarily focus on the parts necessary for explaining the relevant sections of this disclosure. Any parts omitted from the explanation will be considered to be based on prior art. Furthermore, identical or equivalent components in the drawings are denoted by the same or similar reference numerals, and redundant explanations are omitted. Additionally, if multiple identical or equivalent components are included in the drawings, reference numerals may be assigned to only some of them for clarity.

[0017] Figure 1 is a schematic perspective view showing an example of a power storage device 1 according to one embodiment. In this embodiment, the power storage device (sometimes called a "battery pack") 1 is described as an example of one mounted in an appropriate location on a vehicle, for example, on the floor. In this regard, arrow FR in Figure 1 corresponds to the front of the vehicle on which the power storage device 1 is mounted, and similarly, arrow UPR corresponds to the top of the vehicle, and arrow RH corresponds to the right of the vehicle. In the following description, the direction along arrow FR will be called the front-rear direction, and similarly, the direction along arrow RH will be called the left-right direction, and the direction along arrow RH will be called the up-down direction. The left-right direction mentioned above is an example of the "first direction", the front-rear direction is an example of the "second direction", and the up-down direction is an example of the "third direction".

[0018] As shown in Figure 1, the energy storage device 1 according to this embodiment includes a plurality of energy storage modules 10A to 10D, a housing 20 in which the plurality of energy storage modules 10A to 10D are installed, and inter-module busbars 80A and 80B that electrically connect adjacent energy storage modules. The energy storage device 1 may also include a positive electrode busbar 30 and a negative electrode busbar 40 electrically connected to the plurality of energy storage modules 10A to 10D. The positive electrode busbar 30 and the negative electrode busbar 40 are examples of "busbars".

[0019] Each of the energy storage modules 10A to 10D has multiple energy storage cells 11. The multiple energy storage cells 11 may be arranged in a line along the front-to-back direction. In the energy storage device 1 of this embodiment, as shown in Figure 1, an example is provided in which four long energy storage modules 10A to 10D in the front-to-back direction are installed substantially in parallel along the left-to-right direction in the housing 20. Hereafter, for the sake of ease of explanation, the four energy storage modules 10A to 10D described above may be referred to as the "first energy storage module 10A," the "second energy storage module 10B," the "third energy storage module 10C," and the "fourth energy storage module 10D," respectively. In addition, although the four energy storage modules 10A to 10D of this embodiment are shown as being connected in series with each other, they may be partially connected in parallel.

[0020] Although the four power storage modules 10A to 10D described above have slight differences in the layout of the terminals 15F and 15R, etc., they generally have the same configuration. Specifically, the four power storage modules 10A to 10D may be composed of a plurality of power storage cells 11 arranged in a row along the front-rear direction, end plates 12F and 12R disposed at both ends in the front-rear direction and supporting the plurality of power storage cells 11, and a support 13 supporting the plurality of power storage cells 11 and the end plates 12F and 12R.

[0021] The plurality of power storage cells 11 can be configured by, for example, rectangular cells that are long in the left-right direction. Lithium-ion batteries, lithium iron phosphate (LFP) ion batteries, all-solid-state batteries, etc. can be used for the power storage cells 11, but they are not particularly limited. Further, the shape of the power storage cells 11 is not limited to the above-described rectangular shape, and a cylindrical shape or a pouch shape can also be adopted. The power storage cells 11 may be electrically connected to other adjacent power storage cells 11.

[0022] The end plates 12F and 12R may be respectively disposed at the front end and the rear end of the plurality of power storage cells 11 arranged along the front-rear direction and attached to the support 13 to support the plurality of power storage cells 11. A spacer 14 (see FIG. 4) for supporting the side surface of the power storage cell 11 may be provided between the end plates 12F and 12R and the support 13. Further, at appropriate positions on the outer surfaces of the end plates 12F and 12R in the front-rear direction, projecting portions 16 where the terminals 15F and 15R constituting the positive and negative electrodes of each of the power storage modules 10A to 10D can be installed one by one may be provided.

[0023] The support 13 can be composed of a plate-like member that is long along the front-rear direction and has side walls provided at the left and right ends. A plurality of power storage cells 11 can be placed on the upper part of this support 13.

[0024] Figure 2 is an exploded perspective view showing an enlarged view of the main parts of the energy storage device 1 shown in Figure 1. Four energy storage modules 10A to 10D are installed in parallel along the left-right direction in the housing 20. As shown in Figures 1 and 2, the housing 20 may consist of a lower housing 21 on which the four energy storage modules 10A to 10D are mounted in a horizontally aligned state, and an upper housing 22 that covers the top of the four energy storage modules 10A to 10D mounted on the lower housing 21. The lower housing 21 and the upper housing 22 may be made of a highly impact-resistant material, such as a metal material. The number of energy storage modules installed in the housing 20 is not limited to four, but an even number is preferable because it makes it easier to identify the neutral point, as will be described later.

[0025] The lower housing 21 may be divided into a module installation area 23 on which four energy storage modules 10A to 10D are mounted, and a busbar arrangement area 24 on which the positive busbar 30 and negative busbar 40 are arranged. The module installation area 23 may be composed of a rectangular area to match the shape of the four energy storage modules 10A to 10D. The busbar arrangement area 24 may be composed of an area that is narrowed towards the rear so as to not interfere with the rear wheels of the vehicle on which the energy storage device 1 is mounted, while ensuring space for routing the positive busbar 30 and negative busbar 40.

[0026] The polarity of terminals 15F and 15R of the four energy storage modules 10A to 10D installed in the module installation area 23 can be adjusted to match the connection configuration between the energy storage modules 10A to 10D. In this embodiment, terminal 15F of the first energy storage module 10A is configured as the negative terminal and terminal 15R as the positive terminal. Similarly, terminal 15F of the second energy storage module 10B is configured as the positive terminal and terminal 15R as the negative terminal, terminal 15F of the third energy storage module 10C is configured as the negative terminal and terminal 15R as the positive terminal, and terminal 15F of the fourth energy storage module 10D is configured as the positive terminal and terminal 15R as the negative terminal.

[0027] The upper housing 22 may have substantially the same shape as the lower housing 21. This upper housing 22 can function as part of the vehicle's floor. In addition, electrical equipment 50 (see Figure 1) may be installed at the rear upper part of the upper housing 22 such that at least a portion of it overlaps with the positive busbar 30 and the negative busbar 40 when the energy storage device 1 is viewed from above. In a portion of the upper housing 22 corresponding to the busbar arrangement area 24, an opening 25 may be provided that penetrates vertically and electrically connects the electrical equipment 50 and the energy storage modules 10A to 10D. The electrical equipment 50 is an example of a "monitoring device". Note that in Figure 1, the front portion of the upper housing 22 is omitted to make the structure of the four energy storage modules 10A to 10D easier to see. Also, in Figure 3, the illustration of the electrical equipment 50 is omitted.

[0028] The energy storage device 1 preferably includes a battery management system (BMS) to avoid operational abnormalities such as overcharging and overheating of the energy storage modules 10A to 10D. The aforementioned battery management system may include, for example, electrical equipment 50 connected to the energy storage modules 10A to 10D, and a cooling device (not shown) for cooling the energy storage modules 10A to 10D. The cooling device may consist of a refrigerant passage through which a refrigerant can pass, provided at an appropriate location in the lower housing 21 or the upper housing 22. Examples of refrigerants include air and water.

[0029] The electrical equipment 50 may selectively include one or more components, such as a junction box connected to the energy storage modules 10A to 10D to control charging and discharging, a battery ECU that manages the operation of the junction box, an onboard charger (OBC) used during charging, an inverter, or a DC / DC converter. Furthermore, the electrical equipment 50 in this embodiment also functions as a monitoring device that monitors the presence or absence of water inside the housing 20 by monitoring the electrical signals input from the energy storage modules 10A to 10D. It should be noted that the function corresponding to the aforementioned monitoring device does not necessarily need to be located within the energy storage device 1; the electrical signals input from the energy storage modules 10A to 10D may be monitored by an external device, such as the vehicle's ECU.

[0030] As shown in Figure 2, the positive electrode busbar 30 is connected to the positive electrodes of the multiple energy storage modules 10A to 10D and is led out to the busbar installation area 24. This positive electrode busbar 30 constitutes at least a part of the wiring for connecting the multiple energy storage modules 10A to 10D and the electrical equipment 50, and may be made of a strip-shaped metal plate. The positive electrode busbar 30 in this embodiment has contacts at both ends in the longitudinal direction, and one of these contacts may be electrically connected to a terminal 15R provided on the rear end plate 12R of the first energy storage module 10A, which is one of the multiple energy storage modules 10A to 10D that are electrically connected to each other. The terminal 15R of the first energy storage module 10A described above constitutes the positive electrodes of the four electrically connected energy storage modules 10A to 10D. Preferably, the part of the positive electrode busbar 30 other than the contacts is covered with an insulating cover. Copper, aluminum, brass, or alloys thereof may be used for the various busbars, including the positive electrode busbar 30 used in this embodiment.

[0031] As shown in Figure 2, the negative electrode busbar 40 is connected to the negative electrodes of the multiple energy storage modules 10A to 10D and is led out to the busbar installation area 24. Similar to the positive electrode busbar 30, this negative electrode busbar 40 also constitutes at least a part of the wiring for connecting the multiple energy storage modules 10A to 10D and the electrical equipment 50, and may be made of a strip-shaped metal plate. The negative electrode busbar 40 in this embodiment has contacts at both ends, and one of these contacts may be electrically connected to a terminal 15R provided on the rear end plate 12R of the fourth energy storage module 10D, which is one of the multiple energy storage modules 10A to 10D that are electrically connected to each other. The terminal 15R of the fourth energy storage module 10D in this embodiment constitutes the negative electrodes of the four electrically connected energy storage modules 10A to 10D. Furthermore, it is preferable that the portion of the negative electrode busbar 40 excluding the contacts is covered with an insulating cover.

[0032] Furthermore, in order to enable partial charging and discharging of multiple energy storage modules 10A to 10D, the energy storage device 1 may have a pair of neutral point busbars 60 and 70 connected to the neutral points of multiple energy storage modules 10A to 10D that are electrically connected to each other. The pair of neutral point busbars 60 and 70 in this embodiment are led out behind the four energy storage modules 10A to 10D and arranged in the busbar arrangement area 24, similar to the positive electrode busbar 30 and the negative electrode busbar 40. The neutral point refers to the midpoint that bisects the voltage of multiple electrically connected energy storage modules, or the voltage reference point. The neutral point busbars 60 and 70 described above are examples of "busbars," similar to the positive electrode busbar 30 and the negative electrode busbar 40.

[0033] As shown in Figure 2, the neutral busbars 60 and 70, like the positive busbar 30 and negative busbar 40, constitute wiring for connecting the four energy storage modules 10A to 10D and the electrical equipment 50, and may be made of, for example, a strip of metal plate. Each of the neutral busbars 60 and 70 has contacts at both ends, and one of these contacts is connected to the neutral point of the four electrically connected energy storage modules 10A to 10D. In this embodiment, the neutral point of the energy storage device 1 is the contact point to which the second and third energy storage modules 10B and 10C are connected. Therefore, one contact of one neutral busbar 60 is electrically connected to terminal 15R provided on the rear end plate 12R of the second energy storage module 10B. Also, one contact of the other neutral busbar 70 is electrically connected to terminal 15R provided on the rear end plate 12R of the third energy storage module 10C. Furthermore, the parts of the pair of neutral busbars 60 and 70 excluding the contacts may be covered by insulating covers. The polarity of the terminals 15R, 15R to which the pair of neutral busbars 60 and 70 are connected is not particularly limited, but the polarity of the terminals 15R, 15R of the second and third energy storage modules 10B and 10C may be adjusted such that, for example, one neutral busbar 60 is the negative terminal and the other neutral busbar 70 is the positive terminal.

[0034] As described above, by arranging the positive busbar 30, the negative busbar 40, and the neutral busbars 60 and 70 in the busbar arrangement area 24, the wiring between the energy storage modules 10A to 10D and the electrical equipment 50 can be consolidated, resulting in a space-efficient energy storage device. The other contacts of the positive busbar 30, the negative busbar 40, and the neutral busbars 60 and 70 are connected directly or indirectly to the electrical equipment 50.

[0035] As described above, the four energy storage modules 10A to 10D of this embodiment are electrically connected to each other. When making these connections, minimizing the wiring space is important in order to secure ample installation space for the energy storage modules 10A to 10D. With this in mind, the energy storage device 1 further includes inter-module busbars 80A and 80B for connecting two adjacent energy storage modules.

[0036] As shown in Figure 1, the inter-module busbars 80A and 80B are composed of strip-shaped metal plates similar to the positive electrode busbar 30 and negative electrode busbar 40, and connect the terminals of two adjacent energy storage modules. It is preferable that the inter-module busbars 80A and 80B are arranged on the other side, more specifically the front side, along the front-to-back direction of the four energy storage modules 10A to 10D, as this reduces the installation space required for the inter-module busbars 80A and 80B. The energy storage device 1 of this embodiment may include a first inter-module busbar 80A that electrically connects the first energy storage module 10A and the second energy storage module 10B, and a second inter-module busbar 80B that electrically connects the third energy storage module 10C and the fourth energy storage module 10D. The first inter-module busbar 80A and the second inter-module busbar 80B can adopt the same structure, except for the presence or absence of terminal pieces 90. Therefore, the configuration of the second inter-module busbar 80B will be described in more detail below, representing the two inter-module busbars 80A and 80B.

[0037] Figure 3 is an enlarged perspective view of the second intermodule busbar shown in Figure 1. Figure 4 is a schematic cross-sectional view taken along line AA shown in Figure 1. Note that Figure 4 shows a cross-sectional view taken along line AA after the energy storage device 1 has been assembled. Also, in Figure 4, the detailed structure of each component is partially omitted. As shown in Figures 3 and 4, the second intermodule busbar 80B is equipped with a pair of contacts 81A and 81B, which are electrically connected by a connecting portion 82. A through hole into which a screw 83 can be inserted is formed approximately in the center of the pair of contacts 81A and 81B.

[0038] The screw 83 is used to bring the pair of contacts 81A and 81B into contact with the terminal 15F of the third energy storage module 10C and the terminal 15F of the fourth energy storage module 10D. In connection with this, the terminals 15F of each energy storage module 10A to 10D are provided with through holes into which the screw 83 is inserted, and the protruding portion 16 of each energy storage module 10A to 10D is provided with a screw hole 16A into which the screw 83 is screwed. In addition, washers 84 may be inserted between the screw 83 and the pair of contacts 81A and 81B.

[0039] In this embodiment, the connection between the inter-module busbars 80A and 80B and the terminals 15F of each energy storage module 10A to 10D is first made by placing the inter-module busbars 80A and 80B on top of the terminals 15F to which their respective contacts 81A and 81B are connected. Next, the respective contacts 81A and 81B are screwed to the protruding portion 16 of the end plate 12F using screws 83. As a result, the contacts 81A and 81B and the terminals 15F are fixed in a stacked state and electrically connected.

[0040] The energy storage device 1 of this embodiment employs a conductive terminal piece 90 to quickly detect when water enters the housing 20 from the outside or when leakage occurs from the energy storage cell 11. The terminal piece 90 is provided so as to extend downward from one contact 81B of the intermodule bus bar, more specifically the second intermodule bus bar 80B. As shown in Figure 4, the tip 91 of this terminal piece 90 faces the upper surface of the housing 20, more specifically the lower housing 21, at a predetermined distance. The terminal piece 90 of this embodiment is illustrated as being integrated with the second intermodule bus bar 80B, but is not limited to this. For example, the terminal piece 90 may be prepared as a separate component from the second intermodule bus bar 80B and attached to an appropriate location on the second intermodule bus bar 80B.

[0041] The terminal piece 90 in this embodiment has a shape that extends horizontally from the front end of one contact 81B of the second intermodule busbar 80B, curves downward, and then extends toward the upper surface of the lower housing 21. The reason for positioning the terminal piece 90 at the front end of one contact 81B is that, since no other members such as the support 13 are disposed between that part and the lower housing 21, the tip 91 of the terminal piece 90 can be positioned at a desired location while keeping the overall length of the terminal piece 90 down. The position of the tip 91 of the terminal piece 90 should be adjusted so that the tip 91 does not come into contact with the lower housing 21 when the energy storage device 1 is in use. Note that the position of the terminal piece 90 is not limited to the front end of one contact 81B of the second intermodule busbar 80B as described above, but may be at other locations on the second intermodule busbar 80B. Furthermore, in this embodiment, a terminal piece 90 is provided on the second intermodule busbar 80B as an example, but instead of this, or in addition, the aforementioned terminal piece 90 can also be placed on the first intermodule busbar 80A.

[0042] Preferably, the length and shape of the terminal piece 90 described above are adjusted so that it quickly contacts the liquid present at the bottom of the housing 20. When the terminal piece 90 comes into contact with the liquid, a change occurs in the electrical signal input from each energy storage module 10A to 10D to the electrical equipment 50. The electrical equipment 50 can detect the presence or absence of liquid inside the housing 20 by monitoring whether or not this change occurs. Furthermore, since the inter-module busbars 80A and 80B are located on the front side of the energy storage device 1, the terminal piece 90 provided on the second inter-module busbar 80B can be positioned near the front end of the housing 20. This position is more prone to liquid accumulation inside the housing 20 compared to the center of the housing 20, so the energy storage device 1 of this embodiment is arranged in a way that facilitates contact between the terminal piece 90 and the liquid inside the housing 20.

[0043] If the contact time between the liquid accumulated at the bottom of the housing 20 and the terminal piece 90 is short, the change in the electrical signal input from each energy storage module 10A to 10D to the electrical equipment 50 will be temporary, making it difficult for the electrical equipment 50 to detect whether or not it has come into contact with the liquid. In particular, when the energy storage device 1 is mounted on a moving object such as a vehicle, the liquid in the housing 20 may move frequently, so the contact time between the terminal piece 90 and the liquid tends to be short. Therefore, in this embodiment, a receiving portion 26 capable of temporarily storing liquid is adopted at a position opposite the tip 91 of the terminal piece 90 of the lower housing 21. Note that this receiving portion 26 can be omitted.

[0044] The receiving portion 26 can be composed of a substantially box-shaped member including a bottom wall positioned opposite the tip 91 of the terminal piece 90 with a small gap (for example, about 1 to 10 mm) between them, and side walls extending from around the bottom wall to a position slightly higher (for example, about 1 to 50 mm) than the height of the tip 91 of the terminal piece 90. The receiving portion 26 is capable of at least temporarily storing liquid that enters from the opening at the top, and at least the tip 91 of the terminal piece 90 is located inside the receiving portion 26. In order to quickly bring the liquid into contact with the terminal piece 90 when liquid enters the receiving portion 26, it is preferable that the size of the bottom wall of the receiving portion 26 and the distance from the tip 91 of the terminal piece 90 are adjusted to be small enough so as not to come into contact with the terminal piece 90 during use.

[0045] By adopting the aforementioned receiving portion 26, the liquid that enters the receiving portion 26 can be retained within the receiving portion 26, thereby increasing the contact time between the terminal piece 90 and the liquid. This makes it easier for the electrical device 50 to detect changes in electrical signals and enables accurate detection of the presence of liquid inside the housing 20.

[0046] In the energy storage device 1, which includes the configuration described above, the numerical value of the electrical signal input from the energy storage modules 10A to 10D to the electrical equipment 50 changes when the terminal piece 90 comes into contact with the liquid. When the electrical equipment 50 detects this change, it notifies the user, such as the vehicle driver, that liquid is present inside the housing 20. Such notification can alert the user to the possibility of damage to the housing 20, submersion of the energy storage device 1, or leakage of liquid from the energy storage cell 11, and can provide a trigger for performing maintenance on the energy storage device 1.

[0047] According to the energy storage device 1 with the above configuration, if water enters from the outside or if liquid leaks from the energy storage cell 11 and liquid is present inside the housing 20, the presence of the liquid can be quickly detected by bringing the liquid into contact with the terminal piece 90. Therefore, by simply adopting a relatively simple configuration such as the terminal piece 90, it becomes possible to detect the presence of liquid inside the housing 20.

[0048] This disclosure is not limited to the embodiments described above, and can be implemented with various modifications without departing from the spirit of this disclosure. All such modifications are included in the technical concept of this disclosure. Furthermore, unless otherwise specified in the specification, each component of this disclosure is not limited to one, but may exist in multiple forms. [Explanation of Symbols]

[0049] 1. Energy storage device 10A~10D Energy Storage Module 11 energy storage cells 15F, 15R terminals 20 cabinets 26 Receiving part 30. Positive busbar (an example of a busbar) 40. Negative electrode busbar (an example of a busbar) 50. Electrical equipment (an example of a monitoring device) 60, 70 Neutral point busbar (an example of a busbar) 80A, 80B Intermodal Busbars 81A, 81B contacts 90 Terminal piece 91 Tip

Claims

1. Multiple energy storage modules, each equipped with multiple energy storage cells, A housing in which the plurality of energy storage modules are installed in parallel along the first direction, An inter-module busbar connecting two adjacent energy storage modules among the plurality of energy storage modules, A conductive terminal piece extending downward from the intermodule busbar, with its tip facing the housing at a predetermined distance, A power storage device equipped with the following features.

2. The system further includes a monitoring device that monitors electrical signals input from the aforementioned multiple energy storage modules. The energy storage device according to claim 1.

3. The system further comprises a busbar connected to the plurality of energy storage modules and disposed on one side along a second direction intersecting the first direction of the plurality of energy storage modules, The inter-module busbar is arranged on the other side of the plurality of energy storage modules along the second direction. The energy storage device according to claim 1.

4. The housing is provided with a receiving portion capable of storing liquid at a position opposite to the tip of the terminal piece. The energy storage device according to claim 1.

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