Voltage detection device and battery module

Abstract

To secure electric insulation between different lead parts.SOLUTION: A first voltage detection unit 30A includes a plurality of first voltage detection units 310A connected to a plurality of lead parts 110 of a plurality of battery cells 100, a first holder 300A that holds the first voltage detection units 310A, and an insulator provided in the first holder 300A and having at least a part existing between the different lead parts 110.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a voltage detection device and a battery module. [Background technology]

[0002] A battery module such as a lithium-ion secondary battery may include a plurality of stacked battery cells. In such a battery module, the plurality of battery cells are electrically connected to each other by positive and negative electrode leads that are drawn out from the exterior material of the battery cells.

[0003] Patent Document 1 describes an example of a battery module. In this battery module, a positive electrode lead of one battery cell is joined to a negative electrode lead of another battery cell. As a result, the one battery cell and the other battery cell are electrically connected via a lead portion including a positive electrode lead and a negative electrode lead joined to each other.

[0004] Patent Documents 2 and 3 describe examples of battery modules, in which a positive electrode lead of one battery cell and a negative electrode lead of another battery cell are electrically connected to each other via a bus bar.

[0005] Patent Document 4 describes an example of a battery module, in which a positive fastening terminal welded to a positive lead of one battery cell and a negative fastening terminal welded to a negative lead of another battery cell are electrically connected to each other. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2020-47435 A [Patent Document 2] JP 2017-84465 A [Patent Document 3] Special Publication No. 2014-516457 [Patent Document 4] JP 2020-87721 A Summary of the Invention [Problem to be solved by the invention]

[0007] For example, as described in Patent Document 1, when one battery cell and another battery cell are joined to each other via a lead portion, electrical insulation between different lead portions may not be ensured. For example, when a battery module receives a large impact, the lead portion may be deformed. In this case, adjacent lead portions may come into contact with each other, causing a short circuit between the adjacent lead portions.

[0008] One object of the present invention is to ensure electrical insulation between different leads. Other objects of the present invention will become apparent from the description herein. [Means for solving the problem]

[0009] One aspect of the present invention is A plurality of voltage detection units connected to a plurality of lead portions of a plurality of battery cells; A holder that holds the plurality of voltage detection units; an insulator provided on the carrier, at least a portion of which is positioned between the different lead portions; The voltage detection device includes:

[0010] Another aspect of the present invention is The voltage detection device; the plurality of battery cells having the plurality of lead portions electrically connected to the plurality of voltage detection units; A battery module comprising: 。 Effect of the Invention

[0011] According to the above aspect of the present invention, electrical insulation between different lead portions can be ensured. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a front perspective view of the battery module according to the embodiment. [Diagram 2] FIG. 2 is a perspective view of the battery module according to the embodiment, seen from the rear. [Diagram 3] FIG. 2 is a view showing a state in which a container is removed from FIG. 1. [Figure 4] FIG. 3 is a view showing the container removed from FIG. 2. [Diagram 5] FIG. 2 is a perspective view of the cell stack according to the embodiment, as viewed from the front. [Figure 6] 4 is an enlarged view of a position where a first fuse device is provided in the first voltage detection device according to the embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In all the drawings, the same components are given the same reference numerals, and the description will be omitted as appropriate.

[0014] In this specification, ordinal numbers such as "first," "second," "third," etc., unless otherwise specified, are used merely to distinguish between similarly named configurations and do not imply any particular characteristics (e.g., order or importance) of the configurations.

[0015] Fig. 1 is a perspective view of a battery module 50 according to an embodiment, as seen from the front. Fig. 2 is a perspective view of a battery module 50 according to an embodiment, as seen from the rear. Fig. 3 is a view in which a housing body 20 is removed from Fig. 1. Fig. 4 is a view in which a housing body 20 is removed from Fig. 2. Fig. 5 is a perspective view of a cell stack 10 according to an embodiment, as seen from the front.

[0016] 1 to 5, the arrows indicating the first direction X, the second direction Y, and the third direction Z indicate that the direction from the base end of the arrow to the tip end is the positive direction of the direction indicated by the arrow, and the direction from the tip end of the arrow to the base end is the negative direction of the direction indicated by the arrow. The first direction X indicates one direction parallel to the horizontal direction perpendicular to the vertical direction. Specifically, the first direction X indicates the front-to-rear direction of the battery module 50. The positive direction of the first direction X is the direction from the front to the rear of the battery module 50. The negative direction of the first direction X is the direction from the rear to the front of the battery module 50. The second direction Y indicates a direction perpendicular to the vertical direction and the first direction X. The second direction Y indicates the left-to-right direction of the battery module 50. The positive direction of the second direction Y is the direction from the right to the left of the battery module 50 when viewed from the front of the battery module 50. The negative direction of the second direction Y is the direction from the right to the left of the battery module 50 when viewed from the front of the battery module 50. Battery module 50 The third direction Z is the direction from the left to the right of the battery module 50. The third direction Z indicates a direction parallel to the vertical direction. The positive direction of the third direction Z is the direction from the bottom to the top of the battery module 50. The negative direction of the third direction Z is the direction from the top to the bottom of the battery module 50.

[0017] The relationship between the first direction X, the second direction Y, the third direction Z, the vertical direction, and the horizontal direction is not limited to the above example. For example, the first direction X or the second direction Y may be parallel to the vertical direction. Battery module 50 may be arranged.

[0018] Hereinafter, unless otherwise specified, "right" and "left" respectively refer to the right and left when viewed from the front of the battery module 50.

[0019] In this embodiment, the battery module 50 is mounted on a moving object such as an automobile. However, the use of the battery module 50 is not limited to this example.

[0020] The battery module 50 includes a cell stack 10, a housing 20, a first voltage detection device 30A, and a second voltage detection device 30B. The first voltage detection device 30A includes a first fuse device 40A. The second voltage detection device 30B includes a second fuse device 40B. As will be described later with reference to FIG. 6, the first fuse device 40A includes a fuse electrically connected to the terminal positive electrode lead 112T. The second fuse device 40B includes a fuse electrically connected to the terminal negative electrode lead 114T.

[0021] 5, the cell stack 10 includes a plurality of cell groups 100G stacked in a second direction Y. Each cell group 100G includes a plurality of battery cells 100 stacked in the second direction Y. Each battery cell 100 includes an exterior material 102, a positive electrode lead 112, and a negative electrode lead 114.

[0022] In this embodiment, each cell group 100G includes two battery cells 100. However, each cell group 100G may include three or more battery cells 100. Note that in the cell stack 10, the multiple cell groups 100G may not be connected in series, but the multiple battery cells 100 may be connected in series. In other words, the number of battery cells 100 included in the cell group 100G may be only one.

[0023] Each battery cell 100 is placed substantially vertically. The battery cells 100 being placed substantially vertically does not only mean that the battery cells 100 are placed strictly vertically. The battery cells 100 being placed substantially vertically means that the battery cells 100 may be inclined obliquely from the third direction Z as long as the operation of the battery module 50 is not impaired.

[0024] As shown in FIG. 3 and FIG. 4, a plurality of adhesive members 104 are arranged on the upper surface of the cell stack 10. Each adhesive member 104 is, for example, a cured body of a liquid resin. In this embodiment, the plurality of adhesive members 104 are arranged regularly. Specifically, the plurality of adhesive members 104 extend parallel to the second direction Y and are arranged parallel to the first direction X. An insulating sheet (not shown) is arranged above the plurality of adhesive members 104. A sixth cover member 260 (described later) is arranged above the insulating sheet (not shown). The layout of the adhesive members 104 is not limited to the layout according to this embodiment. For example, the adhesive members 104 may be provided over the entire upper surface of the cell stack 10. Alternatively, the plurality of adhesive members 104 may be arranged irregularly, or may be arranged according to a rule different from that shown in FIG. 3 and FIG. 4. The adhesive members are also arranged on the lower surface of the cell stack 10 in the same manner as on the upper surface of the cell stack 10.

[0025] The exterior material 102 contains a positive electrode, a negative electrode, and a separator (not shown) together with an electrolyte (not shown). In one example, the positive electrode, the negative electrode, and the separator are stacked in the exterior material 102 in the second direction Y. Alternatively, the positive electrode, the negative electrode, and the separator may be wound in the exterior material 102.

[0026] The positive electrode lead 112 is drawn out in a substantially horizontal direction from one of the front end and the rear end of the exterior material 102. The positive electrode lead 112 is electrically connected to a positive electrode in the exterior material 102. In one example, the positive electrode lead 112 is made of a metal such as aluminum. The positive electrode lead 112 being drawn out in a substantially horizontal direction does not only mean that the positive electrode lead 112 is drawn out in a strictly horizontal direction. The positive electrode lead 112 being drawn out in a substantially horizontal direction means that the positive electrode lead 112 may be drawn out in a direction deviated from the horizontal direction as long as the operation of the battery module 50 is not impaired.

[0027] The negative electrode lead 114 is drawn out substantially horizontally from the other of the front end and the rear end of the exterior material 102. The negative electrode lead 114 is electrically connected to the negative electrode electrode in the exterior material 102. In one example, the negative electrode lead 114 is made of a metal, such as copper, different from the metal constituting the positive electrode lead 112. The negative electrode lead 114 being drawn out substantially horizontally does not only mean that the negative electrode lead 114 is drawn out strictly horizontally. The negative electrode lead 114 being drawn out substantially horizontally means that the negative electrode lead 114 may be drawn out in a direction deviated from the horizontal direction as long as the operation of the battery module 50 is not impaired.

[0028] When each cell group 100G includes a plurality of battery cells 100, the plurality of battery cells 100 are connected in parallel. Specifically, the plurality of battery cells 100 included in each cell group 100G are stacked in the second direction Y. The positive electrode leads 112 of the plurality of battery cells 100 included in each cell group 100G are bundled and connected to each other in the second direction Y. The negative electrode leads 114 of the plurality of battery cells 100 included in each cell group 100G are bundled and connected to each other in the second direction Y. Adjacent battery cells 100 may be stacked via an adhesive member. Examples of the adhesive member include a double-sided tape and a liquid resin that hardens.

[0029] The multiple cell groups 100G are connected in series via the lead portion 110. The lead portion 110 includes multiple positive electrode leads 112 of one of the cell groups 100G adjacent to each other in the second direction Y, and multiple negative electrode leads 114 of the other of the cell groups 100G adjacent to each other in the second direction Y. The multiple positive electrode leads 112 and the negative electrode leads 114 included in the lead portion 110 are joined to each other by a joining method such as laser welding, ultrasonic bonding, resistance welding, and adhesion. When the material of the positive electrode lead 112 and the material of the negative electrode lead 114 are different, among these joining methods, laser welding is preferable from the viewpoint of high reliability of the joining and reduction in the number of parts. The lead portion 110 is folded back between the cell groups 100G adjacent to each other in the second direction Y. As a result, the multiple lead portions 110 are lined up in the second direction Y at the front of the cell stack 10. Furthermore, at the rear of the cell stack 10, a plurality of lead portions 110 are arranged in the second direction Y.

[0030] In this embodiment, as shown in Fig. 3, at a joint between the positive electrode leads 112 and the negative electrode leads 114 of each lead portion 110 located at the front of the cell stack 10, the negative electrode leads 114 are located forward of the positive electrode leads 112. Also, as shown in Fig. 4, at a joint between the positive electrode leads 112 and the negative electrode leads 114 of each lead portion 110 located at the rear of the cell stack 10, the positive electrode leads 112 are located rearward of the negative electrode leads 114. When the positive electrode leads 112 are located forward of the negative electrode leads 114 at the front of the cell stack 10, the material of the first tip portion 314A described later is preferably the same as the material of the positive electrode lead 112.

[0031] In this embodiment, as shown in FIG. 3, the positive electrode leads 112 included in the cell group 100G at one end of the multiple cell groups 100G connected in series are located on the right front side of the cell stack 10. Hereinafter, as necessary, the positive electrode leads 112 included in the cell group 100G at one end of the multiple cell groups 100G connected in series are referred to as a terminal positive electrode lead 112T. Also, as shown in FIG. 4, the negative electrode leads 114 included in the cell group 100G at the other end of the multiple cell groups 100G connected in series are located on the left rear side of the cell stack 10. Hereinafter, as necessary, the negative electrode leads 114 included in the cell group 100G at the other end of the multiple cell groups 100G connected in series are referred to as a terminal negative electrode lead 114T.

[0032] The structure of the cell stack 10 is not limited to the structure according to this embodiment. For example, the terminal negative electrode lead 114T may be located on the left front side of the cell stack 10 instead of the left rear side. In this example, both the terminal positive electrode lead 112T and the terminal negative electrode lead 114T are located on the front side. Whether the terminal negative electrode lead 114T is located on the left front side or the left rear side of the cell stack 10 can be adjusted depending on the number of cell groups 100G stacked in the second direction Y.

[0033] In this embodiment, as shown in FIG. 3, the front surface of the joint of the positive electrode lead 112 and the negative electrode lead 114 of each lead portion 110 located in the front of the cell stack 10 is substantially parallel to the direction perpendicular to the first direction X. The front surface of the joint is substantially parallel to the direction perpendicular to the first direction X does not only mean that the front surface of the joint is strictly parallel to the direction perpendicular to the first direction X. The front surface of the joint is substantially parallel to the direction perpendicular to the first direction X also means that the front surface of the joint is slightly deformed from the state parallel to the direction perpendicular to the first direction X within a range that does not impair the function of the lead portion 110. In this embodiment, it is easier to join the first voltage detection portion 310A described later to the front surface of the lead portion 110 compared to the case where the front surface of the joint is curved. In another example different from this embodiment, the front surface of the above-mentioned joint may be curved.

[0034] In this embodiment, as shown in FIG. 4, the rear surface of the joint between the positive electrode lead 112 and the negative electrode lead 114 of each lead portion 110 located at the rear of the cell stack 10 is substantially parallel to a direction perpendicular to the first direction X, similar to the front surface of the joint between the positive electrode lead 112 and the negative electrode lead 114 of each lead portion 110 located at the front of the cell stack 10.

[0035] The housing 20 houses the cell stack 10, the first voltage detection device 30A, and the second voltage detection device 30B. The housing 20 has a first cover member 210, a second cover member 220, a third cover member 230, a fourth cover member 240, a fifth cover member 250, and a sixth cover member 260. In this embodiment, the first cover member 210, the second cover member 220, the third cover member 230, the fourth cover member 240, the fifth cover member 250, and the sixth cover member 260 are made of a metal containing aluminum as a main component, for example. However, the material constituting the first cover member 210, the second cover member 220, the third cover member 230, the fourth cover member 240, the fifth cover member 250, and the sixth cover member 260 is not limited to this example.

[0036] The first cover member 210 covers the front side of the cell stack 10 and the first voltage detection device 30A. The second cover member 220 covers the rear side of the cell stack 10 and the second voltage detection device 30B. The third cover member 230 covers the right side of the cell stack 10. The fourth cover member 240 covers the left side of the cell stack 10. The fifth cover member 250 covers the lower side of the cell stack 10. The sixth cover member 260 covers the upper side of the cell stack 10.

[0037] As shown in Figs. 1 and 2, a "+" mark is provided on the right front side of the upper surface of the sixth cover member 260. Also, a "-" mark is provided on the left rear side of the upper surface of the sixth cover member 260. The "+" mark indicates that the terminal positive electrode lead 112T shown in Fig. 3 is located at the position where the "+" mark is provided. The "-" mark indicates that the terminal negative electrode lead 114T shown in Fig. 4 is located at the position where the "-" mark is provided. Therefore, even if the cell stack 10 is almost invisible from the outside of the housing 20, the user of the battery module 50 can determine the positions of the terminal positive electrode lead 112T and the terminal negative electrode lead 114T from the "+" mark and the "-" mark.

[0038] The first voltage detecting device 30A has a first holding body 300A, a plurality of first voltage detecting parts 310A, a plurality of first voltage detecting lines 320A, and a first connector 330A.

[0039] The first holder 300A is provided in front of the cell stack 10. The first holder 300A is an insulator. Examples of the insulator include: P The first holder 300A is attached to the housing 20 by mechanical joining such as snap fitting, screws, etc. The first holder 300A is made of a polypropylene-based resin or a resin having the same or higher hardness and insulating properties as the first holder 300A.

[0040] Each first voltage detection portion 310A has a first base end portion 312A, a first tip end portion 314A, and a first connection portion 316A.

[0041] The first base end 312A is supported movably in the first direction X along the first support shaft 318A provided on the first holder 300A. Thus, each of the first voltage detection units 310A is held by the first holder 300A. The first support shaft 318A penetrates a through hole provided in the first base end 312A in the first direction X. The diameter of the front end of the first support shaft 318A in a direction perpendicular to the first direction X is larger than the diameter of the through hole of the first base end 312A in a direction perpendicular to the first direction X. Therefore, the first base end 312A is prevented from coming off the first support shaft 318A toward the front of the first support shaft 318A.

[0042] In this embodiment, the first tip 314A is positioned horizontally and vertically offset from the first base 312A when viewed from the front of the cell stack 10. Specifically, the first tip 314A is positioned on the lower right side of the first base 312A when viewed from the front of the cell stack 10. As a result, a gap is provided on the right side of the first base 312A and above the first tip 314A, where a part of the front surface of the lead 110 is exposed forward. Therefore, at least a part of a joint such as a laser welded part between the positive electrode lead 112 and the negative electrode lead 114 can be provided in a region of the lead 110 that overlaps the gap with the first direction X. That is, the joint of the lead 110 needs not to overlap the first tip 314A in the first direction X. Therefore, in this embodiment, the vertical length of the joint of the lead portion 110 can be made longer than in the case where the first tip portion 314A is positioned to the right of the first base end portion 312A without being shifted downward relative to the first base end portion 312A. Therefore, in this embodiment, the connection between the positive electrode lead 112 and the negative electrode lead 114 in the lead portion 110 can be made better than in the above-mentioned case.

[0043] In addition, in this embodiment, the first tip portion 314A is shifted toward the lead portion 110 relative to the first base end portion 312A. Therefore, in this embodiment, compared to a case where the position of the first base end portion 312A in the first direction X and the position of the first tip portion 314A in the first direction X are aligned in the first direction X, it is possible to easily bring the first tip portion 314A close to the lead portion 110 and to easily connect the first tip portion 314A to the lead portion 110. In addition, in this embodiment, the range of motion of the first base end portion 312A in the first direction X can be increased compared to the above-mentioned case.

[0044] The first connection portion 316A protrudes downward from the first base end portion 312A. One end of the first voltage detection line 320A is connected to the first connection portion 316A. The first connection portion 316A may be integral with the first base end portion 312A, for example. As shown in FIG. 6 described later, in this embodiment, the first connection portion 316A has two first barrels 316aA that crimp one end of the first voltage detection line 320A. The two first barrels 316aA are aligned vertically. One end of the first voltage detection line 320A enters the internal space of the two first barrels 316aA substantially parallel to the vertical direction from below the two first barrels 316aA, and is crimped by the two first barrels 316aA. As a result, one end of the first voltage detection line 320A is fixed to the first connection portion 316A. However, the method of fixing one end of the first voltage detection line 320A to the first connection portion 316A is not limited to the method according to the present embodiment. For example, the number of first barrels 316aA provided on each first connection portion 316A may be only one. In addition, one end of the first voltage detection line 320A may be soldered to the first connection portion 316A.

[0045] The shape of the first voltage detection unit 310A is not limited to the shape according to this embodiment, so long as the first tip portion 314A does not overlap in the first direction X with the joint portion between the positive electrode lead 112 and the negative electrode lead 114 of the lead portion 110. For example, when viewed from the front of the cell stack 10, the above-mentioned gap may not be provided to the right of the first base end portion 312A and above the first tip portion 314A. Furthermore, the position of the first base end portion 312A in the first direction X and the position of the first tip portion 314A in the first direction X may be aligned in the first direction X.

[0046] Each of the multiple first voltage detection units 310A is connected to each of the multiple lead parts 110 at the front of the cell stack 10. Specifically, each first tip part 314A is joined to each lead part 110 at the front of the cell stack 10 by a joining method such as laser welding. In this embodiment, the rear surface of the first tip part 314A is joined to the front surface of the joint part of the positive electrode lead 112 and the negative electrode lead 114 of the lead part 110. It is preferable that the first tip part 314A is made of the same material as the part of the lead part 110 that contacts the first tip part 314A. In this embodiment, the first tip part 314A contacts the negative electrode lead 114. In this example, it is easier to join the first tip part 314A to the negative electrode lead 114 compared to the case where the first tip part 314A is made of a material different from that of the negative electrode lead 114. In another example, first tip 314A may be made of a different material than the portion of lead 110 that contacts first tip 314A.

[0047] Each of the first voltage detection lines 320A electrically connects each of the first voltage detection units 310A to the first connector 330A. As described above, one end of each of the first voltage detection lines 320A is connected to the first connection unit 316A. The other end of each of the first voltage detection lines 320A is connected to the first connector 330A. In this embodiment, a portion of each of the first voltage detection lines 320A is drawn from the first connection unit 316A to a space below the first frame 340A via a notch 350A provided in the first frame 340A described later. The notch 350A is provided at a corner between a second edge 344A and a third edge 346A described later of the first frame 340A. Another portion of each first voltage detection wire 320A passes through a space between adjacent first frames 340A in an area shifted rightward from the center of the first holding body 300A, and is drawn out from the space below the multiple first frames 340A to a first connector 330A located above the multiple first frames 340A. The position of the first voltage detection unit 310A, the routing of the first voltage detection wire 320A, the position of the notch 350A, and the position of the first connector 330A are not limited to the example according to this embodiment.

[0048] In this embodiment, at least a portion of the region of the first voltage detection line 320A located between the first connection portion 316A and the notch 350A is flexible. When the first base end 312A is moved in the first direction X along the first support shaft 318A, the first voltage detection line 320A may come into contact with the first holder 300A or the first frame 340A in the vicinity of the notch 350A. Even in such a case, the first base end 312A can be moved in the first direction X along the first support shaft 318A by bending at least the portion of the first voltage detection line 320A.

[0049] The first holding body 300A has a plurality of first frames 340A. The first frames 340A are insulators. Examples of the insulators include: PA polypropylene-based resin or a resin having hardness and insulating properties equivalent to or greater than that of the polypropylene-based resin is used. Each of the multiple first frames 340A surrounds each of the multiple lead parts 110 and each of the multiple first voltage detection parts 310A. Therefore, the lead parts 110 and the first voltage detection parts 310A can be protected from external impact by the first frames 340A. Each of the first frames 340A does not have to be located in the entire area surrounding each of the lead parts 110 and each of the first voltage detection parts 310A. Each of the first frames 340A may be located in at least a part of the area surrounding each of the lead parts 110 and each of the first voltage detection parts 310A. The first holder 300A may be made of a single member, or may be made of multiple members combined with each other.

[0050] Each first frame 340A includes a first edge 342A, a second edge 344A, a third edge 346A, and a fourth edge 348A. The first edge 342A extends vertically on the right side of the lead 110 and the first voltage detection unit 310A surrounded by each first frame 340A. The second edge 344A extends vertically on the left side of the lead 110 and the first voltage detection unit 310A surrounded by each first frame 340A. The third edge 346A extends left and right on the lower side of the lead 110 and the first voltage detection unit 310A surrounded by each first frame 340A. The fourth edge 348A extends left and right on the upper side of the lead 110 and the first voltage detection unit 310A surrounded by each first frame 340A.

[0051] The shape of the first frame 340A is not limited to the shape according to this embodiment. For example, the first frame 340A may not have one of the first edge portion 342A and the second edge portion 344A. 、 At least one of the third edge 346A and the fourth edge 348A may be absent.

[0052] In this embodiment, at least a portion of the insulator constituting each first frame 340A is located between the first voltage detection unit 310A surrounded by each first frame 340A and a lead portion 110 different from the lead portion 110 connected to the first voltage detection unit 310A. Therefore, in this embodiment, electrical insulation can be ensured between the first voltage detection unit 310A surrounded by each first frame 340A and the lead portion 110 different from the lead portion 110 connected to the first voltage detection unit 310A.

[0053] Specifically, except for the first frame 340A located at the rightmost end, at least a portion of the insulator constituting the first edge 342A is located between the first voltage detection unit 310A located on the left side of the first edge 342A and the lead portion 110 located on the right side of the first edge 342A. Therefore, compared to the case where the first edge 342A is not provided, it is possible to ensure electrical insulation between the first voltage detection unit 310A located on the left side of the first edge 342A and the lead portion 110 located on the right side of the first edge 342A.

[0054] Moreover, except for the first frame 340A located at the leftmost end, at least a portion of the insulator constituting the second edge 344A is located between the first voltage detection unit 310A located on the right side of the second edge 344A and the lead portion 110 located on the left side of the second edge 344A. Therefore, compared to the case where the second edge 344A is not provided, it is possible to ensure electrical insulation between the first voltage detection unit 310A located on the right side of the second edge 344A and the lead portion 110 located on the left side of the second edge 344A.

[0055] In this embodiment, at least a portion of the insulator constituting each first frame 340A is located between different lead portions 110. Specifically, at least a portion of the insulator constituting each first frame 340A is located between adjacent lead portions 110. Therefore, electrical insulation between different lead portions 110 can be ensured, compared to a case where at least a portion of the insulator constituting each first frame 340A is not located between different lead portions 110.

[0056] Specifically, except for the first frame 340A located at the rightmost end, at least a portion of the insulator constituting the first edge 342A is located between the lead portion 110 located on the left side of the first edge 342A and the lead portion 110 located on the right side of the first edge 342A. Therefore, compared to the case where the first edge 342A is not provided, it is possible to ensure electrical insulation between the lead portion 110 located on the left side of the first edge 342A and the lead portion 110 located on the right side of the first edge 342A.

[0057] Moreover, except for the first frame 340A located at the leftmost end, at least a portion of the insulator constituting the second edge 344A is located between the lead portion 110 located on the right side of the second edge 344A and the lead portion 110 located on the left side of the second edge 344A. Therefore, compared to the case where the second edge 344A is not provided, it is possible to ensure electrical insulation between the lead portion 110 located on the right side of the second edge 344A and the lead portion 110 located on the left side of the second edge 344A.

[0058] In addition, an insulating protrusion protruding toward the positive side of the first direction X may be provided on the surface of the first frame 340A on the positive side in the first direction X. At least a part of this protrusion is located between the lead parts 110 adjacent in the second direction Y. For example, the protrusion is provided on the positive side in the first direction X of the first edge part 342A of the first frame 340A on the left side of the first frames 340A adjacent in the second direction Y, and on the positive side in the first direction X of the second edge part 344A of the first frame 340A on the right side of the first frames 340A adjacent in the second direction Y. In this example, when the lead parts 110 adjacent in the second direction Y are shifted in the second direction Y due to a factor such as an external impact, the lead parts 110 hit the protrusion. Therefore, it is possible to suppress the collision between the lead parts 110 adjacent in the second direction Y. The length of the protrusion is not particularly limited, but may be, for example, a length sufficient to prevent the leads 110 adjacent to each other in the second direction Y from colliding with each other. In addition, the position at which the protrusion is provided is not limited to the above example.

[0059] In this embodiment, at least a portion of the insulator constituting each first frame 340A is located between at least one lead portion 110 and at least a portion of the housing 20 that has conductivity. Therefore, in this embodiment, electrical insulation between at least one lead portion 110 and at least a portion of the housing 20 that has conductivity can be ensured.

[0060] Specifically, at least a portion of the third edge 346A is located below the lead 110 surrounded by each first frame 340A. In this embodiment, the front end of the fifth cover member 250 is located below the lower end of the lead 110. In the case where the fifth cover member 250 is conductive, if the lower end of the lead 110 contacts the front end of the fifth cover member 250, there is a risk of a short circuit between the lead 110 and the fifth cover member 250. In contrast, in this embodiment, at least a portion of the insulator constituting the third edge 346A is located between the lower end of the lead 110 and the front end of the fifth cover member 250. Therefore, compared to the case where the third edge 346A is not provided, a short circuit between the lead 110 and the fifth cover member 250 can be suppressed.

[0061] In the above example, it has been described that the third edge 346A ensures electrical insulation between the lower end of the lead 110 and the front end of the fifth cover member 250. However, ensuring electrical insulation between the lead 110 and the container 20 by the first frame 340A is not limited to the above example. For example, the fourth edge 348A can ensure electrical insulation between the upper end of the lead 110 and the front end of the sixth cover member 260. In addition, the first edge 342A of the first frame 340A located at the rightmost end of the multiple first frames 340A can ensure electrical insulation between the right end of the multiple lead 110 and the front end of the third cover member 230. In addition, the second edge 344A of the first frame 340A located at the leftmost end of the multiple first frames 340A can ensure electrical insulation between the left end of the multiple lead 110 and the front end of the fourth cover member 240.

[0062] In this embodiment, between the lead parts 110 adjacent to each other in the second direction Y, there are located a second edge part 344A of the first frame 340A surrounding the right lead part 110 of the lead parts 110 adjacent to each other in the second direction Y, and a first edge part 342A of the first frame 340A surrounding the left lead part 110 of the lead parts 110 adjacent to each other in the second direction Y. Therefore, the distance in the second direction Y between the lead parts 110 adjacent to each other in the second direction Y must be greater than the distance in the second direction Y between the second edge part 344A and the first edge part 342A described above located between the lead parts 110 adjacent to each other in the second direction Y. The distance in the second direction Y between the lead parts 110 adjacent to each other in the second direction Y increases as the number of battery cells 100 included in the cell group 100G increases. Therefore, it is easier to increase the distance in the second direction Y between adjacent lead portions 110 in the second direction Y when the cell group 100G includes multiple battery cells 100 than when the cell group 100G includes only one battery cell 100.

[0063] The second voltage detecting device 30B, like the first voltage detecting device 30A, has a second holding body 300B, a plurality of second voltage detecting parts 310B, a plurality of second voltage detecting lines 320B, and a second connector 330B.

[0064] The second holding body 300B is provided behind the cell stack 10. Each of the second voltage detection units 310B is connected to each of the lead portions 110 at the rear of the cell stack 10. In this embodiment, the surface of each of the second voltage detection units 310B on the negative side in the first direction X is joined to the surface of the joint of the positive electrode lead 112 and the negative electrode lead 114 of the lead portion 110 on the positive side in the first direction X. Each of the second voltage detection lines 320B electrically connects each of the second voltage detection units 310B to the second connector 330B. The second holding body 300B is provided with a plurality of second frames 340B. Each of the second frames 340B is provided behind the cell stack 10 in the same manner as the first frames 340A. A plurality of leads 110 and each of the plurality of second voltage detection units 310B.

[0065] FIG. 6 is an enlarged view of a position where a first fuse device 40A is provided in a first voltage detection device 30A according to an embodiment.

[0066] The first fuse device 40A includes a first base 302A, a first conductor 400A, a first fixture 432A, a second fixture 434A, and a first wire 440A.

[0067] The first base 302A includes a right end portion of the first holding body 300 A. In this embodiment, the first base 302A includes the rightmost two first frames 340A among the plurality of first frames 340A.

[0068] The first conductor 400A is provided on the first base 302A. The first conductor 400A is made of, for example, a metal. The first conductor 400A functions as a bus bar electrically connected to the terminal positive lead 112T.

[0069] The first conductor 400A includes a plurality of extensions extending in different directions, at least a portion of at least one of which is held by the first base 302A.

[0070] Specifically, the first conductor 400A includes a first extension 410A extending in the horizontal direction and a second extension 420A extending in the vertical direction. The second extension 420A extends downward from the right end of the first extension 410A. The first extension 410A and the second extension 420A are integrally formed. However, the first conductor 400A may be formed by combining, for example, a metal that becomes the first extension 410A and a metal that becomes the second extension 420A. However, the method of forming the first conductor 400A is not limited to this example. In addition, the shape of the first conductor 400A is not limited to the shape according to this embodiment. For example, the first conductor 400A may not include the second extension 420A.

[0071] The first extension body 410A includes a first wide portion 412A, a narrow portion 414A, and a second wide portion 416A. The left end of the narrow portion 414A is connected to the right end of the first wide portion 412A. The right end of the narrow portion 414A is connected to the left end of the second wide portion 416A.

[0072] The first wide portion 412A functions as a terminal for electrically connecting to another battery module (not shown). A fastening hole 450A is provided at the left end of the first wide portion 412A. For example, a fastener (not shown) for fixing a bus bar (not shown) electrically connected to another battery module is fixed to the fastening hole 450A. In this embodiment, the periphery of the fastening hole 450A of the first wide portion 412A is located higher than the narrow portion 414A. However, the periphery of the fastening hole 450A of the first wide portion 412A may be located at the same height as the narrow portion 414A.

[0073] The narrow portion 414A functions as a fuse. The width of the narrow portion 414A in the first direction X is narrower than both the width of the first wide portion 412A in the first direction X and the width of the second wide portion 416A in the first direction X. Therefore, the cross-sectional area perpendicular to the second direction Y of the narrow portion 414A is smaller than both the cross-sectional area perpendicular to the second direction Y of the first wide portion 412A and the cross-sectional area perpendicular to the second direction Y of the second wide portion 416A. Therefore, when an overcurrent flows through the first conductor 400A, the narrow portion 414A is more likely to melt than the first wide portion 412A and the second wide portion 416A.

[0074] In the present embodiment, the narrow portion 414A is attached to the first holding body 300A. Therefore, the first voltage detection unit 310A and the fuse can be provided more efficiently in terms of space than when a structure for holding the fuse is provided separately from the first holding body 300A.

[0075] Furthermore, in this embodiment, the battery module 50 can be made smaller than when a tubular fuse tube is used as the fuse. Specifically, when a tubular fuse is used, the higher the energy of the battery module 50, the larger the size of the tubular fuse. Therefore, in a battery module 50 with a relatively high energy, the space required for providing the tubular fuse is relatively large. In contrast, when a portion of the first conductor 400A functions as a fuse, the space required for providing the fuse can be made smaller than when a tubular fuse is used.

[0076] In this embodiment, the narrow portion 414A extends in the same direction as the extension direction of the first wide portion 412A. That is, the first wide portion 412A and the narrow portion 414A extend in the second direction Y. If the narrow portion 414A is provided in the second extension body 420A and extends in a direction perpendicular to the extension direction of the first wide portion 412A, it may be difficult to join the narrow portion 414A provided in the second extension body 420A to the terminal positive electrode lead 112T. In contrast, in this embodiment, it is not necessary to provide the narrow portion 414A in the second extension body 420A. Therefore, in this embodiment, the length in the third direction Z of the joint portion between the second extension body 420A and the terminal positive electrode lead 112T can be made longer than in the above-mentioned case. In addition, in this embodiment, the length in the second direction Y of the narrow portion 414A can be easily adjusted compared to the above-mentioned case. Furthermore, in this embodiment, the narrow portion 414A and the terminal positive lead 112T can be provided farther apart than in the above-mentioned case. Therefore, in this embodiment, the influence of heat generation in the narrow portion 414A on the terminal positive lead 112T can be suppressed compared to the above-mentioned case.

[0077] A first space 402A that defines the narrow width portion 414A is provided in front of the narrow width portion 414A of the first extension body 410A. In this embodiment, the first space 402A is formed by punching out a front portion of a portion of the conductor that constitutes the first extension body 410A that becomes the narrow width portion 414A by press working.

[0078] The first extension body 410A has no space behind the narrow portion 414A that defines the narrow portion 414A. However, the method of forming the narrow portion 414A is not limited to the method according to this embodiment. For example, the first space 402A may be provided behind the narrow portion 414A. Alternatively, the first space 402A may be provided both in front and behind the narrow portion 414A. The first space 402A may be formed by a through hole that penetrates the first extension body 410A in the vertical direction. In this case, the portions of the first extension body 410A on both sides of the first space 402A in the first direction X become the narrow portions 414A that function as fuses.

[0079] When the narrow portion 414A is formed by pressing, as in the present embodiment, it is preferable that the space defining the narrow portion 414A is provided only on one of both sides of the first extension 410A in the first direction X. In this case, it is not necessary to punch out the rear portion of the portion of the conductor constituting the first extension 410A that will become the narrow portion 414A by pressing. The present embodiment is compared with a case in which both the front and rear portions of the portion of the conductor constituting the first extension 410A that will become the narrow portion 414A are punched out by pressing. In the above case, compared to the present embodiment, the front and rear portions of the portion that will become the narrow portion 414A must be punched out simultaneously or individually, so that the mechanical load applied to the narrow portion 414A that is the narrowest in the first extension 410A during pressing increases. For this reason, in the above case, compared to the present embodiment, it is necessary to widen the width of the narrow portion 414A in the first direction X from the viewpoint of suppressing breakage of the narrow portion 414A. In contrast to this, in this embodiment, the width of the narrow width portion 414A in the first direction X can be made narrower than in the above-mentioned case, and the degree of freedom in the size of the narrow width portion 414A can be increased.

[0080] The method of forming the narrow portion 414A is not limited to press processing. The narrow portion 414A may be formed by laser processing, for example. When the narrow portion 414A is formed by laser processing, the space defining the narrow portion 414A may be provided on only one of both sides of the first extension body 410A in the first direction X, or may be provided on both sides of the first extension body 410A in the first direction X.

[0081] The second space 304A is provided below the narrow portion 414A. The second space 304A is defined by a recess provided on the upper surface of the first base 302A on which the first extension body 410A is placed. In this embodiment, when an overcurrent flows through the first conductor 400A and the narrow portion 414A melts, the melted narrow portion 414A can fall toward the second space 304A. Therefore, according to this embodiment, the probability of melting the narrow portion 414A can be increased compared to when the lower surface of the narrow portion 414A is in contact with the upper surface of the first base 302A.

[0082] In this embodiment, at least a portion of the narrow portion 414A is located above at least one of the positive electrode lead 112 and the negative electrode lead 114. In addition, at least a portion of the first base 302A is located between at least one of the positive electrode lead 112 and the negative electrode lead 114 and at least a portion of the narrow portion 414A in the third direction Z. Specifically, a portion defining the bottom of the recess in the first base 302A is located between at least one of the positive electrode lead 112 and the negative electrode lead 114 and at least a portion of the narrow portion 414A in the third direction Z. Therefore, it is possible to prevent the molten narrow portion 414A from contacting the positive electrode lead 112 or the negative electrode lead 114 located below the narrow portion 414A.

[0083] First base 302AThe portion located above at least one of the positive electrode lead 112 and the negative electrode lead 114 may have heat resistance. For example, a heat-resistant layer may be provided on the bottom surface of the recess of the first base 302A. The heat-resistant layer may be a metal or an inorganic material such as ceramic or glass. By providing the heat-resistant layer, it is possible to more reliably prevent the molten narrow width portion 414A from melting the main body of the first base 302A and coming into contact with the positive electrode lead 112, the negative electrode lead 114, or the first wiring 440A.

[0084] The first wide portion 412A is fixed to the first base 302A by a first fastener 432A. In this embodiment, the first fastener 432A is a screw that penetrates the first wide portion 412A in the vertical direction and is inserted into a portion of the first base 302A that is located below the first wide portion 412A. The first wide portion 412A is provided with a through hole through which the shaft portion of the first fastener 432A can be inserted in the vertical direction. The first fastener 432A may be a fastener other than a screw, for example, a screw, a bolt, or the like.

[0085] The second wide portion 416A is fixed to the first base 302A by the second fastener 434A. In this embodiment, the second fastener 434A is a screw that penetrates the second wide portion 416A in the vertical direction and is inserted into a portion of the first base 302A that is located below the second wide portion 416A. The second wide portion 416A is provided with a through hole through which the shaft portion of the second fastener 434A can be inserted in the vertical direction. The second fastener 434A may be a fastener other than a screw, for example, a screw, a bolt, or the like.

[0086] In this embodiment, the fasteners such as the first fastener 432A and the second fastener 434A are detachable from the first conductor 400A. Therefore, when it becomes necessary to replace the first conductor 400A due to melting of the narrow portion 414A, the first conductor 400A can be replaced with a new first conductor 400A by removing the fasteners such as the first fastener 432A and the second fastener 434A.

[0087] The method of fixing the first conductor 400A to the first base 302A is not limited to the above example. For example, at least a portion of the first conductor 400A may be joined to at least a portion of the first base 302A via a mechanical joint such as a snap fit.

[0088] In this embodiment, both the first wide portion 412A and the second wide portion 416A are fixed to the first base 302A by the first fastener 432A and the second fastener 434A. In this case, it is possible to suppress the application of a force that breaks the narrow portion 414A to the narrow portion 414A, compared with a case in which at least one of the first wide portion 412A and the second wide portion 416A is not fixed to the first base 302A. The force that breaks the narrow portion 414A occurs when a fastener (not shown) is fixed to the fastening hole 450A when a bus bar (not shown) is attached to the first wide portion 412A to electrically connect the battery module 50 to another battery module (not shown). This is because the fastening hole 450A and the narrow portion 414A are located in approximately the same plane perpendicular to the third direction Z.

[0089] The first fixture 432A and the second fixture 434A are preferably disposed in a position close to the narrow width portion 414A. For example, the first fixture 432A and the second fixture 434A are preferably provided in positions facing each other across the first space 402A.

[0090] In this embodiment, at least a portion of the first wiring 440A passes through the first space 402A. In this case, the first wiring 440A can be arranged spatially more efficiently than when the first wiring 440A passes through a region other than the first space 402A.

[0091] In this embodiment, at least a portion of the first wiring 440A passes through a portion horizontally shifted from a portion located below the narrow portion 414A of the first base 302A. In this embodiment, a through hole through which the first wiring 440A passes is provided in the bottom surface of a recess that defines the second space 304A in the first base 302A. The through hole is located on the negative side of the first direction X from the region directly below the narrow portion 414A. This makes it possible to make it difficult for the narrow portion 414A, which has melted and fallen into the second space 304A, to come into contact with the first wiring 440A.

[0092] The first wiring 440A has one end connected to the second wide portion 416A and the other end connected to the first connector 330A shown in FIG. 3. A portion of the first wiring 440A is drawn downward from the end of the first wiring 440A connected to the second wide portion 416A and passes through the first space 402A and the second space 304A. Another portion of the first wiring 440A passes through a portion of the first base 302A located below the second space 304A and a region between the two rightmost first frames 340A, and is drawn to a space below the first frames 340A. Still another portion of the first wiring 440A passes through a space between the adjacent first frames 340A in a region shifted to the right from the center of the first holding body 300A, and is drawn from the space below the first frames 340A to the first connector 330A located above the first frames 340A. The layout of the first wiring 440A is not limited to the example according to this embodiment.

[0093] In this embodiment, one end of the first wiring 440A connected to the second wide portion 416A is fixed to the second wide portion 416A by the second fixing device 434A. In this embodiment, the first wiring 440A can be easily attached and detached when the narrow portion 414A melts, compared to a case where the one end of the first wiring 440A is fixed to the second wide portion 416A by, for example, solder. A connection part such as a crimp terminal may be provided at the one end of the first wiring 440A. In this case, the connection part is fixed by the second fixing device 434A, so that the one end of the first wiring 440A can be fixed to the second wide portion 416A. However, the method of connecting the one end of the first wiring 440A to the second wide portion 416A is not limited to this example.

[0094] In this embodiment, the second fixture 434A fixes both the second wide portion 416A and one end of the first wiring 440A connected to the second wide portion 416A to the first base 302A. In this case, the number of parts can be reduced compared to a case in which a fixture for fixing the second wide portion 416A to the first base 302A and a fixture for fixing the one end of the first wiring 440A to the first base 302A are separately provided. In another example different from this embodiment, a fixture for fixing the second wide portion 416A to the first base 302A and a fixture for fixing the one end of the first wiring 440A to the first base 302A may be separately provided.

[0095] The portion of the second wide portion 416A where the second fixing device 434A is provided functions as a voltage detection portion that detects the voltage of the terminal positive lead 112T. That is, the terminal positive lead 112T is a voltage detection target of the portion of the second wide portion 416A where the second fixing device 434A is provided. The first wiring 440A functions as a voltage detection line electrically connected to the voltage detection portion. In this embodiment, one end of the first wiring 440A fixed by the second fixing device 434A is electrically connected to the second wide portion 416A. In this case, compared to the case where the first wiring 440A is electrically connected to the first wide portion 412A, the voltage of the terminal positive lead 112T can be detected by suppressing the influence of the voltage drop in the narrow portion 414A, so that the voltage of the terminal positive lead 112T can be detected more accurately.

[0096] In FIG. 3 and FIG. 6, the second extension 420A is electrically connected to the terminal positive lead 112T. In this embodiment, the right side of the second extension 420A and the left side of the terminal positive lead 112T are joined to each other by a joining method such as laser welding. The second extension 420A does not have to be provided. When the second extension 420A is not provided, it is also possible to electrically connect the terminal positive lead 112T and the first extension 410A via an L-shaped bus bar (not shown).

[0097] At least a portion of the second extension body 420A is held by at least a portion of the first base 302A. Second extension body 420A The upper end of the first base 302A is Second extension body 420AThe upper end of the second extension 420A is held by both side surfaces in the second direction Y of a through hole through which the second extension 420A penetrates. The lower end of the second extension 420A is held by both side surfaces in the second direction Y of a hole in the first base 302A into which the lower end of the second extension 420A is inserted. In this embodiment, it is preferable because it is possible to suppress the application of a force that rotates the narrow portion 414A in a direction perpendicular to the vertical direction, compared to a case in which the second extension 420A is not held by the first base 302A. Therefore, it is possible to further suppress the breakage of the narrow portion 414A, compared to a case in which the second extension 420A is not held by the first base 302A.

[0098] Although the embodiments of the present invention have been described above with reference to the drawings, these are merely examples of the present invention, and various configurations other than those described above can also be adopted.

[0099] For example, the first fuse device 40A according to the embodiment is electrically connected to the battery cell 100. However, the first fuse device 40A may be electrically connected to an electronic device different from the battery cell 100. The same applies to the second fuse device 40B. Below, examples of reference forms are given. 1. A plurality of voltage detection units connected to a plurality of lead portions of a plurality of battery cells; A holder that holds the plurality of voltage detection units; an insulator provided on the carrier, at least a portion of which is positioned between the different lead portions; A voltage detection device comprising: 2. A voltage detection device as described in 1., wherein at least another portion of the insulator is located between the lead portion and at least a conductive portion of a housing that houses the multiple battery cells. 3. A voltage detection device according to claim 1 or 2, wherein the insulator is located in at least a portion of the area surrounding the voltage detection portion. 4. A voltage detection device according to any one of 1 to 3, wherein the lead portion includes a plurality of positive electrode leads connected to each other and a plurality of negative electrode leads connected to each other. 5. A voltage detection device according to any one of 1. to 4., the plurality of battery cells having the plurality of lead portions electrically connected to the plurality of voltage detection units; A battery module comprising: [Explanation of symbols]

[0100] 10 Cell stack 20 Containment Unit 30A First Voltage Detector 30B Second voltage detection device 40A First Fuse Unit 40B Second fuse device 50 Battery Module 100 Battery Cells 100G Cell Group 102 Exterior materials 104 Adhesive material 110 Lead section 112 Positive lead 112T Termination Positive Lead 114 Negative lead 114T Negative terminal lead 210 First cover member 220 Second cover member 230 Third cover member 240 Fourth cover member 250 Fifth cover member 260 Sixth cover member 300A 1st holding body 300B 2nd holding body 302A 1st Base 304A 2nd space 310A First voltage detection section 310B Second voltage detection unit 312A First proximal end 314A 1st tip 316A 1st Connection 316aA 1st barrel 318A 1st support shaft 320A 1st voltage detection wire 320B Second voltage detection line 330A 1st Connector 330B 2nd Connector 340A 1st Frame 340B 2nd Frame 342A 1st edge 344A Second Edge 346A Third Edge 348A 4th edge 350A notch 400A First Conductor 402A 1st space 410A First extension 412A First Wide Section 414A Narrow section 416A 2nd wide section 420A Second extension 432A 1st fixture 434A 2nd fixture 440A 1st Wiring 450A Fastening hole X 1st direction Y Second direction Z 3rd direction

Claims

1. A battery cell having a plurality of lead portions; a voltage detection device including: a plurality of voltage detection units connected to the plurality of lead portions; a holder for holding the plurality of voltage detection units; and an insulator provided on the holder, at least a portion of which is located between different lead portions; Equipped with a battery module, wherein each of the plurality of lead portions includes a positive electrode lead of at least one battery cell and a negative electrode lead of at least one other battery cell, the positive electrode lead and the negative electrode lead are joined to each other, and each of the plurality of lead portions is folded back between the at least one battery cell and the at least one other battery cell.

2. 2. The battery module according to claim 1, wherein at least another portion of the insulator is located between the lead portion and at least a conductive portion of a housing that houses the plurality of battery cells.

3. The battery module according to claim 1 , wherein the insulator is located in at least a part of a region surrounding the voltage detection portion.

4. The battery module according to any one of claims 1 to 3, wherein the lead portion includes a plurality of positive electrode leads connected to each other and a plurality of negative electrode leads connected to each other.

5. A plurality of voltage detection units connected to a plurality of lead portions of a plurality of battery cells; A holder that holds the plurality of voltage detection units; an insulator provided on the carrier, at least a portion of which is positioned between the different lead portions; Equipped with a voltage detection device, wherein at least another portion of the insulator is located between the lead portion and at least a conductive portion of a housing that houses the multiple battery cells.

6. A plurality of voltage detection units connected to a plurality of lead portions of a plurality of battery cells; A holder that holds the plurality of voltage detection units; an insulator provided on the carrier, at least a portion of which is positioned between the different lead portions; Equipped with A voltage detection device, wherein the lead portion includes a plurality of positive electrode leads connected to each other and a plurality of negative electrode leads connected to each other.

7. The voltage detection device according to claim 5 , wherein the insulator is located in at least a part of a region surrounding the voltage detection portion.

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