Wiring module and battery pack

Abstract

To provide a wiring module and a battery pack suitable for downsizing a battery pack.SOLUTION: A wiring module of one embodiment is a member used for a battery pack in which a plurality of battery modules are arrayed in a first direction. The wiring module includes an insulating substrate, a wiring member and an electronic component. The substrate is disposed to face a first end of one battery module among the plurality of battery modules in a second direction in a case where the second direction is a direction intersecting the first direction. The wiring member includes a body part supported by the substrate, and a terminal connection part extending from the body part and connected to a detection terminal provided at the first end of the battery module. The electronic component is provided in the wiring member, and is used in association with the battery module.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] FIELD An embodiment of the present invention relates to a wiring module and a battery pack. [Background technology]

[0002] 2. Description of the Related Art Battery packs are known in which a plurality of battery modules are arranged side by side, and battery packs are also known which are provided with signal lines for detecting the state of the batteries. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-82395 [Patent Document 2] Patent Publication No. 2021-72211 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a battery pack including multiple battery modules, if the electronic components used for protecting, adjusting, or detecting the status of each battery module are arranged together in a monitoring device for the battery pack, it may become difficult to miniaturize the battery pack.

[0005] An embodiment of the present invention provides a wiring module and a battery pack that are suitable for miniaturizing a battery pack. [Means for solving the problem]

[0006] A wiring module according to one embodiment of the present invention is a component used in a battery pack in which a plurality of battery modules are arranged in a first direction. The wiring module includes an insulating base, a wiring member, and Multiple fuse componentsWhen a direction intersecting the first direction is defined as a second direction, the base is disposed to face a first end portion of one of the battery modules included in the plurality of battery modules in the second direction. bendable from the main body portion; a main body supported by the base; Branching off from each other extending from the first end of the battery module. Multiple Detection terminal and individually Connected Multiple Terminal connection and a plurality of wirings extending between the main body and the plurality of terminal connection portions so as to be arranged corresponding to the plurality of terminal connection portions, Includes: The plurality of fuse components are provided corresponding to the plurality of wires, respectively, and are connected to the corresponding wires in the main body.

[0007] A battery pack according to an embodiment of the present invention includes a plurality of battery modules and a wiring module. The plurality of battery modules are arranged in a first direction. The wiring module includes an insulating base, a wiring member, and Multiple fuse components When a direction intersecting the first direction is a second direction, the base is disposed to face a first end portion of one of the battery modules included in the plurality of battery modules in the second direction. The wiring member has a main body supported by the base, bendable from the main body portion; From the main body Branching off from each other extending to the first end of the battery module Multiple Detection terminal and individually Connected Multiple Terminal connection and a plurality of wirings extending between the main body and the plurality of terminal connection portions so as to be arranged corresponding to the plurality of terminal connection portions, Includes: The plurality of fuse components are provided corresponding to the plurality of wires, respectively, and are connected to the corresponding wires in the main body. [Effects of the Invention]

[0008] According to one embodiment of the present invention, it is possible to provide a wiring module and a battery pack that are suitable for miniaturizing a battery pack. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view showing the overall configuration of a battery pack according to an embodiment; [Figure 2] FIG. 2 is an exploded perspective view showing a partial configuration of the battery pack according to the embodiment. [Figure 3] FIG. 2 is a front view showing the battery module according to the embodiment. [Figure 4] 4 is a cross-sectional view of the battery pack shown in FIG. 2 taken along line F4-F4. [Figure 5] FIG. 2 is a side view showing the wiring module according to the embodiment. [Figure 6] FIG. 2 is a perspective view showing a wiring module according to the embodiment. [Figure 7] FIG. 2 is a perspective view showing a wiring member, a thermistor, and a connector according to the embodiment. [Figure 8] FIG. 2 is a perspective view illustrating a connection structure of a terminal connection portion according to an embodiment. [Figure 9] FIG. 2 is an electric circuit diagram showing the configuration of the wiring module according to the embodiment. [Figure 10] FIG. 2 is a side view showing two wiring modules according to the embodiment. [Figure 11] FIG. 2 is a perspective view showing a wiring module according to the embodiment; [Figure 12] FIG. 6 is an electric circuit diagram showing the configuration of a wiring module according to a first modified example of the embodiment. [Figure 13] FIG. 10 is an electric circuit diagram showing the configuration of a wiring module according to a second modified example of the embodiment. [Figure 14] FIG. 10 is a side view showing two wiring modules according to a third modified example of the embodiment. [Figure 15] FIG. 10 is a side view showing two wiring modules according to a fourth modified example of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments will be described with reference to the drawings. In the following description, components having the same or similar functions will be assigned the same reference numerals. Duplicate descriptions of these components may be omitted. In this disclosure, terms are defined as follows: "Connection" is not limited to mechanical connection, but may also include electrical connection. That is, "connection" is not limited to direct connection between two elements to be connected, but may also include connection between two elements via another element interposed therebetween. "Supported" is not limited to support via direct contact, but may also include support via another element interposed therebetween.

[0011] In the present disclosure, the +X direction, the −X direction, the +Y direction, the −Y direction, the +Z direction, and the −Z direction are defined as follows: The +X direction is the direction from the battery module 10A described later toward the battery module 10B (see FIG. 2). The −X direction is the direction opposite to the +X direction. When the +X direction and the −X direction are not distinguished, they are simply referred to as the “X direction.” The +Y direction and the −Y direction are directions intersecting (e.g., perpendicular to) the X direction. The +Y direction is the direction from the first end 11EA to the second end 11EB of the battery module 10 described later (see FIG. 2). The −Y direction is the direction opposite to the +Y direction. When the +Y direction and the −Y direction are not distinguished, they are simply referred to as the “Y direction.” The +Z direction is the direction intersecting (e.g., perpendicular to) the X direction and the Y direction. The +Z direction is the direction from the battery module 10 toward the wiring module 80 described later (see FIG. 2). The −Z direction is the direction opposite to the +Z direction. When there is no distinction between the +Z direction and the -Z direction, they are simply referred to as the "Z direction." The X direction is an example of the "first direction." The Y direction is an example of the "second direction." The Z direction is an example of the "third direction."

[0012] (Embodiment) <1. Overall structure of the battery pack> 1 is a perspective view showing the overall configuration of a battery pack 1 according to an embodiment. The battery pack 1 includes, for example, a plurality of battery modules 10, a plurality of wiring modules 20, two wiring modules 80, two insulating members 91, two end plates 92, and a plurality of connecting members 93. The battery pack 1 may further include an outer casing member that houses these members.

[0013] <2. Battery module> First, the battery module 10 will be described. FIG. 2 is an exploded perspective view showing a portion of the battery pack 1. A plurality of battery modules 10 are arranged side by side in the X direction. Each battery module 10 is a structure incorporating a plurality of battery cells 12. In this embodiment, the battery module 10 is a bipolar battery module. Each battery module 10 has, for example, a case 11, a plurality of battery cells 12, a positive electrode terminal 13A (see FIG. 3), a negative electrode terminal 13B (see FIG. 3), and a plurality of voltage detection terminals 14 (see FIG. 3).

[0014] <2.1 Case> The case 11 is a housing that houses multiple battery cells 12. The case 11 has a flat rectangular parallelepiped shape. The case 11 has six end faces. The case 11 is arranged so that the end face (principal face) with the largest area among the six end faces is aligned along the Y direction and the Z direction. The longitudinal direction of the case 11 is, for example, the Y direction.

[0015] In this embodiment, the case 11 has a first end 11EA and a second end 11EB as ends in the Y direction. The first end 11EA is an end on the −Y direction side. The first end 11EA is an example of a “first end of the battery module.” For convenience of explanation, the first end 11EA of the case 11 may be referred to as a “first end 11EA of the battery module 10.” On the other hand, the second end 11EB is an end on the +Y direction side. The second end 11EB is an example of a “second end of the battery module.” For convenience of explanation, the second end 11EB of the case 11 may be referred to as a “second end 11EB of the battery module 10.” Furthermore, hereinafter, when the first end 11EA and the second end 11EB are not to be distinguished from each other, they will simply be referred to as “end 11E.”

[0016] 2.2 Battery cells A plurality of battery cells 12 are housed in the case 11. The plurality of battery cells 12 are arranged, for example, lined up in the X direction inside the case 11. The plurality of battery cells 12 are electrically connected in series. In this embodiment, two battery cells 12 adjacent to each other in the X direction share one current collector that functions as a bipolar electrode. Note that, for convenience of explanation, five battery cells 12 are shown in FIG. 2, but in practice, more battery cells 12 may be arranged.

[0017] <2.3 Positive electrode terminal> FIG. 3 is a front view showing a battery module 10. The positive electrode terminal 13A is a positive terminal (total positive terminal) electrically connected in series to the multiple battery cells 12 included in the battery module 10. The positive electrode terminal 13A is an example of a "first electrode terminal." The positive electrode terminal 13A protrudes to the outside of the case 11 so as to be exposed to the outside of the battery module 10. The positive electrode terminal 13A protrudes in the Y direction from the first end 11EA or the second end 11EB of the case 11. For example, in the battery modules 10 (battery modules 10B, 10D, 10F) located at even-numbered positions counting from the -X direction side, the positive electrode terminal 13A protrudes in the -Y direction from the first end 11EA of the case 11 (see FIG. 4). On the other hand, in the odd-numbered battery modules 10 (battery modules 10A, 10C, 10E) counting from the -X direction side, the positive electrode terminal 13A protrudes in the +Y direction from the second end 11EB of the case 11 (see FIG. 4).

[0018] 3, the positive electrode terminal 13A has a plate shape extending along the Y and Z directions. In this embodiment, the width 13W1 of the positive electrode terminal 13A in the Z direction is larger than the width 13W2 of the positive electrode terminal 13A in the Y direction (i.e., the amount of protrusion in the Y direction from the end 11E of the case 11). For example, the width 13W1 of the positive electrode terminal 13A in the Z direction is at least twice the width 13W2 of the positive electrode terminal 13A in the Y direction.

[0019] <2.4 Negative electrode terminal> The negative electrode terminal 13B is a negative terminal (total negative terminal) electrically connected in series to the multiple battery cells 12 included in the battery module 10. The negative electrode terminal 13B is an example of a "second electrode terminal." The negative electrode terminal 13B protrudes to the outside of the case 11 so as to be exposed to the outside of the battery module 10. The negative electrode terminal 13B protrudes in the Y direction from the first end 11EA or the second end 11EB of the case 11. For example, in this embodiment, in the battery modules 10 (battery modules 10B, 10D, 10F) located at even-numbered positions counting from the -X direction side, the negative electrode terminal 13B protrudes in the +Y direction from the second end 11EB of the case 11 (see FIG. 4). On the other hand, in the odd-numbered battery modules 10 (battery modules 10A, 10C, 10E) counting from the -X direction side, the negative electrode terminal 13B protrudes in the -Y direction from the first end 11EA of the case 11 (see FIG. 4).

[0020] As shown in FIG. 3, the negative electrode terminal 13B has a plate shape extending along the Y and Z directions. In this embodiment, the width 13W3 of the negative electrode terminal 13B in the Z direction is greater than the width 13W4 of the negative electrode terminal 13B in the Y direction (i.e., the amount of protrusion in the Y direction from the end 11E of the case 11). For example, the width 13W3 of the negative electrode terminal 13B in the Z direction is at least twice the width 13W4 of the negative electrode terminal 13B in the Y direction. Note that, hereinafter, when there is no need to distinguish between the positive electrode terminal 13A and the negative electrode terminal 13B, they will simply be referred to as "electrode terminals 13."

[0021] <2.5 Voltage detection terminal> The voltage detection terminal 14 is a terminal for detecting a voltage related to the battery module 10 (e.g., a voltage inside the battery module 10). For example, the voltage detection terminal 14 is a terminal for detecting a voltage between two adjacent battery cells 12 inside the battery module 10. For example, the voltage detection terminal 14 is electrically connected to a current collector (bipolar electrode) shared by two adjacent battery cells 12 in the X direction and detects the voltage between the two battery cells 12. In this embodiment, each battery module 10 has multiple (e.g., 10) voltage detection terminals 14. The multiple voltage detection terminals 14 are connected to different positions inside the battery module 10 and detect the voltage between different pairs of adjacent battery cells 12. The voltage detection terminal 14 is an example of a "detection terminal." Note that the "detection terminal" referred to in this disclosure may also be a terminal for detecting a physical quantity other than voltage (e.g., current or temperature).

[0022] Each of the multiple voltage detection terminals 14 protrudes from the case 11 so as to be exposed to the outside of the battery module 10. In this embodiment, the multiple voltage detection terminals 14 include a first group of multiple (e.g., five) voltage detection terminals 14A and a second group of multiple (e.g., five) voltage detection terminals 14B. The multiple voltage detection terminals 14A in the first group protrude in the -Y direction from the first end 11EA of the case 11. The multiple voltage detection terminals 14A in the first group are arranged side by side in the Z direction and spaced apart from each other in the Z direction. The multiple voltage detection terminals 14A in the first group include three or more detection terminals arranged parallel to each other. Each of the multiple voltage detection terminals 14A in the first group is plate-shaped and extends along the Y and Z directions. In this embodiment, the width 14W2 of the voltage detection terminal 14A in the Y direction (i.e., the amount of protrusion in the Y direction from the end 11E of the case 11) is greater than the width 14W1 of the voltage detection terminal 14A in the Z direction.

[0023] On the other hand, the second group of multiple voltage detection terminals 14B protrudes in the +Y direction from the second end 11EB of the case 11. The second group of multiple voltage detection terminals 14B are arranged side by side in the Z direction while being spaced apart from each other in the Z direction. The second group of multiple voltage detection terminals 14B includes three or more detection terminals arranged parallel to each other. Each of the second group of multiple voltage detection terminals 14B is plate-shaped and extends along the Y and Z directions. In this embodiment, the width 14W4 of the voltage detection terminal 14B in the Y direction (i.e., the amount of protrusion in the Y direction from the end 11E of the case 11) is greater than the width 14W3 of the voltage detection terminal 14B in the Z direction.

[0024] <3. Wiring module> Next, the wiring module 20 will be described. The wiring module 20 is, for example, a relay member for transmitting a signal obtained from the detection terminal of the battery module 10 to the outside. In this embodiment, the wiring module 20 is a relay member that electrically connects the detection terminal of the battery module 10 to a wiring module 80, which will be described later. From another perspective, the wiring module 20 is a member for connecting the electrode terminal 13 of one battery module 10 to the electrode terminal 13 of another battery module 10. The wiring module 20 is an example of a "connection module."

[0025] FIG. 4 is a cross-sectional view of the battery pack 1 shown in FIG. 2 taken along line F4-F4. In this embodiment, the battery pack 1 includes, for example, five types of wiring modules 20: wiring modules 20A, 20B, 20C, 20D, and 20E. The wiring module 20A and the wiring module 20C are arranged corresponding to the even-numbered battery modules 10 (e.g., battery modules 10B, 10D, and 10F) counting from the negative X-direction. The wiring module 20A is arranged on the negative Y-direction side of the battery module 10. The wiring module 20C is arranged on the positive Y-direction side of the battery module 10. On the other hand, the wiring module 20B and the wiring module 20D are arranged corresponding to the odd-numbered battery modules 10 (e.g., battery modules 10C and 10E) counting from the negative X-direction. The wiring module 20B is arranged on the negative Y-direction side of the battery module 10. The wiring module 20D is arranged on the positive Y-direction side of the battery module 10. The wiring module 20E is disposed, for example, in correspondence with the battery module 10 (for example, the battery module 10A) closest to the -X direction.

[0026] Here, first, the common configuration of the wiring modules 20A, 20B, 20C, 20D, and 20E will be described using one wiring module 20A as an example. For details of the common configuration of the wiring module 20B, the “−X direction” and “+X direction” can be replaced in the following description of the wiring module 20A. Similarly, for details of the wiring module 20C, the “−Y direction” and “+Y direction” can be replaced, the “first end 11EA” and “second end 11EB” can be replaced, and the “−X direction” and “+X direction” can be replaced. Similarly, for details of the wiring module 20A below, the “−Y direction” and “+Y direction” can be replaced, and the “first end 11EA” and “second end 11EB” can be replaced in the following description of the wiring module 20A. The wiring module 20E will be described later.

[0027] Fig. 5 is a side view showing one wiring module 20 (for example, wiring module 20A). Fig. 6 is a perspective view showing one wiring module 20 (for example, wiring module 20A). The wiring module 20 has, for example, a base 30, an electrode connecting member 40, a wiring member 50, a thermistor 61, a connector 62, a plurality of fuse components 63 (see Fig. 5), and a cover 64 (see Fig. 2).

[0028] <3.1 Base> The base 30 is a member that serves as the base of the wiring module 20. The base 30 is made of an insulating material such as synthetic resin and has insulating properties. The base 30 is disposed so as to face the end 11E of the battery module 10. For example, the base 30 faces the first end 11EA of the battery module 10 from the -Y direction.

[0029] The base 30 is attached to the end 11E of the battery module 10 using, for example, a fixing portion 30f. The fixing portion 30f is a fastening member such as a bolt, but may also be an engaging structure or the like and is not limited to a specific structure. When the base 30 is attached to the end 11E of the battery module 10, the wiring module 20 and the battery module 10 are integrated. In this embodiment, before the multiple battery modules 10 are arranged side by side, a wiring module 20 is attached to each battery module 10 to form a battery module assembly AS (see FIG. 4). Each battery module assembly AS includes one battery module 10 and two wiring modules 20 arranged separately on both sides of the battery module 10 in the Y direction.

[0030] As shown in FIGS. 5 and 6, the base 30 has, for example, a first portion 31, a second portion 32, a protruding wall 33, and a plurality of partition walls .

[0031] The first portion 31 is a thin plate portion extending in the Z direction along the end portion 11E of the battery module 10. The first portion 31 extends across most of the battery module 10 in the Z direction. The thickness W31 of the first portion 31 in the Y direction is smaller than the width in the Y direction of the electrode terminal 13 described above (e.g., width 13W2, see FIG. 3 ) and is also smaller than the width in the Y direction of the voltage detection terminal 14 described above (e.g., width 14W2, see FIG. 3 ). When the wiring module 20 attached to the battery module 10 is viewed from the −X direction, the tip portions of the electrode terminal 13 and the plurality of voltage detection terminals 14 are exposed in the −X direction without overlapping with the first portion 31.

[0032] The second portion 32 is a thick plate portion extending in the Z direction along the end portion 11E of the battery module 10. The second portion 32 is located away from the first portion 31 in the +X direction. The second portion 32 extends in the Z direction parallel to the first portion 31. The thickness in the Y direction of the second portion 32 is greater than the width in the Y direction of the electrode terminal 13 described above (e.g., width 13W2, see FIG. 3) and is also greater than the width in the Y direction of the voltage detection terminal 14 described above (e.g., width W14W2, see FIG. 3).

[0033] The second portion 32 has a first surface 32a and a second surface 32b. The first surface 32a is a flat surface extending along the X and Z directions. The first surface 32a is a surface portion to which a main body 51 of a wiring member 50 (described later) is attached. The second surface 32b is a flat surface extending along the Y and Z directions. For example, the second surface 32b extends in the +Y direction from the end of the first surface 32a on the -X direction side. The second surface 32b is a surface portion facing a second space S2 (described later).

[0034] In this embodiment, a first space S1 and a second space S2 are provided between the first portion 31 and the second portion 32. The first space S1 is provided at a position corresponding to the electrode terminal 13 of the battery module 10. When the wiring module 20 is attached to the battery module 10, the electrode terminal 13 of the battery module 10 is inserted into the first space S1 (see FIG. 8).

[0035] The second space S2 is provided at a position corresponding to the multiple voltage detection terminals 14 of the battery module 10. When the wiring module 20 is attached to the battery module 10, the multiple voltage detection terminals 14 of the battery module 10 are inserted into the second space S2 (see FIG. 8). The second surface 32b of the second portion 32 described above faces the second space S2 from the +X direction side.

[0036] The protruding wall 33 is a portion that protrudes in the -Y direction compared to the second portion 32 of the base 30. The protruding wall 33 is disposed adjacent to the second portion 32 of the base 30 from the +X direction side. The protruding wall 33 extends linearly in the -Z direction parallel to the second portion 32. The protruding wall 33 is an insulating wall that covers the wiring member 50 and connector 62 (described later) from the +X direction side.

[0037] The plurality of partition walls 34 are disposed between the first portion 31 and the second portion 32 of the base 30. The plurality of partition walls 34 are disposed side by side in the Z direction and spaced apart from one another in the Z direction. Each partition wall 34 extends along the X direction and the Y direction. Each partition wall 34 is connected to the first portion 31 and the second portion 32 of the base 30, respectively. The plurality of partition walls 34 are insulating walls provided in the second space portion S2.

[0038] The multiple partition walls 34 divide the second space S2 into multiple regions R. The multiple regions R are arranged side by side in the Z direction and electrically insulated from one another. The multiple regions R are provided in positions that correspond one-to-one to the multiple voltage detection terminals 14 of the battery modules 10. When the wiring module 20 is attached to the battery module 10, the voltage detection terminals 14 of the battery modules 10 are inserted into each region R (see FIG. 8). The multiple partition walls 34 electrically insulate the multiple voltage detection terminals 14 of the battery modules 10 inserted into the second space S2 from one another.

[0039] 3.2 Electrode connecting material The electrode connection member 40 is a member for connecting the electrode terminals 13 of one battery module 10 to the electrode terminals 13 of another battery module 10. The electrode connection member 40 is attached to the second portion 32 of the base 30, for example, by a fixing portion (not shown). The electrode connection member 40 is supported by the second portion 32 of the base 30. The electrode connection member 40 has a base end portion 41 connected to the electrode terminals 13 of the battery module 10, and a tip end portion 42 connected to an electrode connection member 40 provided on another wiring module 20.

[0040] The base end 41 of the electrode connection member 40 is disposed, for example, along the second surface 32b of the second portion 32 of the base 30 (see FIG. 10 ). The base end 41 faces the electrode terminal 13 of the battery module 10 inserted into the first space S1 from the +X direction side. The base end 41 is joined to the electrode terminal 13 of the battery module 10 by, for example, metal joining. The metal joining is achieved, for example, by performing laser welding or the like from the -X direction side in a state in which the base end 41 of the electrode connection member 40 and the electrode terminal 13 overlap when viewed from the -X direction. However, the method of joining the base end 41 of the electrode connection member 40 to the electrode terminal 13 is not limited to the above example.

[0041] The tip portion 42 of the electrode connecting member 40 extends in the X direction from the base end portion 41. The tip portion 42 of the electrode connecting member 40 will be described in detail later.

[0042] In this embodiment, the electrode connection member 40 is also used as a terminal for detecting the voltage of the electrode terminal 13. The electrode connection member 40 is an example of a "detection terminal." In this disclosure, the term "detection terminal" is not limited to a terminal dedicated to detection, but broadly refers to a terminal that can be used for detection.

[0043] <3.3 Wiring materials> FIG. 7 is a perspective view showing a wiring member 50, a thermistor 61, and a connector 62. The wiring member 50 is a member having wiring 53 for transmitting signals obtained from the detection terminals of the battery module 10 to the outside. The wiring member 50 is, for example, a flat wiring member. In this disclosure, the term "flat wiring member" broadly refers to a member including a flexible insulating substrate and wiring (conductive patterns) provided on the insulating substrate. The flat wiring member is, for example, a flexible flat cable (FFC) or a flexible printed circuit (FPC).

[0044] In this embodiment, the wiring member 50 has a main body portion 51 and a plurality of connection portions 52. The wiring member 50 also has a plurality of wires 53. The wires 53 extend between the main body portion 51 and each of the connection portions 52.

[0045] The main body 51 is in the form of a film extending in the X and Z directions. The main body 51 is disposed so as to face the base 30 in the Y direction. The main body 51 is attached to the first surface 32a of the second portion 32 of the base 30 by a fixing portion (not shown) (for example, an adhesive) or the like (see FIG. 6). The main body 51 is supported by the first surface 32a of the second portion 32 of the base 30.

[0046] The plurality of connection portions 52 include, for example, a plurality of (for example, five) terminal connection portions 52A for voltage detection terminals, a terminal connection portion 52B for electrode terminals, and a thermistor connection portion 52C.

[0047] (Terminal connection for voltage detection terminal) The multiple terminal connection portions 52A branch off and extend from the main body 51. Each of the multiple terminal connection portions 52A is a film extending in the Y and Z directions. The multiple terminal connection portions 52A are formed, for example, by bending a portion of the wiring member 50 from the main body 51. The multiple terminal connection portions 52A are arranged along the second surface 32b of the second portion 32 of the base 30. The multiple terminal connection portions 52A may be attached to the second surface 32b of the second portion 32 of the base 30 by a fixing portion (for example, an adhesive) not shown.

[0048] The multiple terminal connection portions 52A are spaced apart from one another in the Z direction. The multiple terminal connection portions 52A include, for example, three or more terminal connection portions 52A arranged parallel to one another. The multiple terminal connection portions 52A extend separately into the multiple regions R defined by the multiple partition walls 34 described above. That is, each of the multiple terminal connection portions 52A is inserted into a different region R from the others. The partition walls 34 are located between the multiple terminal connection portions 52A.

[0049] 8 is a perspective view illustrating the connection structure of the terminal connection portion 52A. The multiple terminal connection portions 52A are individually connected to the multiple voltage detection terminals 14 of the battery module 10. For example, inside the region R into which the terminal connection portion 52A is inserted, each of the multiple terminal connection portions 52A faces, from the +X direction, the voltage detection terminal 14 inserted into the same region R. In this embodiment, the multiple terminal connection portions 52A face the multiple voltage detection terminals 14 in a state where they are bent from the main body portion 51.

[0050] Terminal connection portion 52A is joined to voltage detection terminal 14 by, for example, metal joining. The metal joining is achieved, for example, by performing laser welding or the like from the −X direction side in a state in which terminal connection portion 52A and voltage detection terminal 14 overlap when viewed from the −X direction. However, the method of joining terminal connection portion 52A and voltage detection terminal 14 is not limited to the above example.

[0051] (Terminal connection part for electrode terminal) The terminal connection portion 52B is a terminal connection portion for detecting the voltage of the electrode terminal 13 (the voltage of the power output from the battery module 10). The terminal connection portion 52B extends in the -Z direction from the main body portion 51 while maintaining the same posture as the main body portion 51. The terminal connection portion 52B is in the form of a film extending along the X and Z directions. When viewed from the Y direction, the terminal connection portion 52B overlaps with the electrode connection member 40. Like the terminal connection portion 52A, the terminal connection portion 52B is joined to the electrode connection member 40 by, for example, metal joining. However, the method of joining the terminal connection portion 52B and the electrode connection member 40 is not limited to the above example.

[0052] (thermistor connection part) The thermistor connection portion 52C branches off and extends from the main body portion 51 together with the multiple terminal connection portions 52A. The thermistor connection portion 52C is in the form of a film extending in the Y and Z directions. The thermistor connection portion 52C is formed, for example, by bending a portion of the wiring member 50 from the main body portion 51. The thermistor connection portion 52C is disposed along the second surface 32b of the second portion 32 of the base 30. The thermistor connection portion 52C may be attached to the second surface 32b of the second portion 32 of the base 30 by a fixing portion (e.g., an adhesive) not shown. The thermistor connection portion 52C is disposed at a different position in the Z direction from the multiple terminal connection portions 52A. The thermistor connection portion 52C is connected to a thermistor 61, which will be described later.

[0053] <3.4 Thermistor> The thermistor 61 is a component that detects a temperature related to the battery module 10. The thermistor 61 is provided inside the wiring module 20. In this embodiment, the thermistor 61 is connected to one voltage detection terminal 14. For example, the thermistor 61 faces the voltage detection terminal 14 from the −X direction side. The thermistor 61 faces the voltage detection terminal 14 from the side opposite the terminal connection portion 52A. The thermistor 61, together with the terminal connection portion 52A, is joined to the voltage detection terminal 14 by, for example, metal joining. However, the method of joining the thermistor 61 and the voltage detection terminal 14 is not limited to the above example.

[0054] <3.5 Connector> The connector 62 is a connection part that electrically and detachably connects the wiring module 20 and the routing module 80. The connector 62 is provided, for example, at an end of the wiring module 20 in the +Z direction. The connector 62 is supported by the base 30. For example, the connector 62 is placed on the main body 51 of the wiring member 50 and supported by the base 30 via the wiring member 50. The connector 62 is connected to the main body 51 of the wiring member 50.

[0055] The connector 62 includes a connector body 62a and a plurality of terminals 62b. The connector body 62a has an opening 62h that opens in the +Z direction and a plurality of terminals (not shown) provided inside the opening 62h. The plurality of terminals 62b are provided between the connector body 62a and the wiring member 50. The plurality of terminals 62b are connected to the plurality of wires 53 of the wiring member 50. In this embodiment, the plurality of terminals 62b correspond one-to-one to the plurality of wires 53 of the wiring member 50.

[0056] <3.6 Fuse Components> The fuse component 63 is provided in the main body 51 of the wiring member 50 (see FIG. 5). The fuse component 63 is, for example, a surface-mount chip fuse. The fuse component 63 is provided in the main body 51 of the wiring member 50, midway along each of the wires 53. For example, each of the wires 53 includes a first portion 53a connected to the connector 62 and a second portion 53b provided at the connection portion 52. The first portion 53a and the second portion 53b are provided spaced apart from each other. The fuse component 63 is electrically connected in series between the first portion 53a and the second portion 53b. When an excessive current flows through the wire 53 on which the fuse component 63 is provided, the fuse component 63 melts to disconnect the first portion 53a from the second portion 53b. For example, the fuse component 63 is provided in the main body 51 of the wiring member 50.

[0057] 9 is an electrical circuit diagram showing the configuration of the wiring module 20 of the embodiment. In this embodiment, the multiple fuse components 63 include multiple (e.g., five) fuse components 63A and one fuse component 63B. The multiple fuse components 63A are arranged electrically in parallel with each other. Each of the multiple fuse components 63A is electrically connected between one voltage detection terminal 14 included in the multiple voltage detection terminals 14 and the connector 62. Meanwhile, the fuse component 63B is electrically connected between the electrode connection member 40 and the connector 62. The fuse components 63 are components used in association with the battery module 10. The fuse components 63 are an example of an "electronic component."

[0058] <3.7 Cover> Returning to Fig. 2, the cover 64 will be described. The cover 64 is a member that forms part of the outer casing of the wiring module 20. The cover 64 covers the base 30, the electrode connecting member 40, the wiring member 50, the thermistor 61, the connector 62, and the plurality of fuse components 63 from the -Y direction side.

[0059] 4. Structure of electrode connecting member Next, a connection structure between the plurality of wiring modules 20 will be described. 10 is a side view showing one wiring module 20A and another wiring module 20B. For ease of explanation, the wiring module 20A will be referred to as the "first wiring module 20A" below. The wiring module 20B will be referred to as the "second wiring module 20B" below.

[0060] The first wiring module 20A is an example of a "first connection module." The electrode terminal 13 (e.g., the positive electrode terminal 13A) of the first wiring module 20A is an example of a "first electrode terminal." The battery module 10 to which the first wiring module 20A is attached is an example of a "first battery module."

[0061] The second wiring module 20B is an example of a "second connection module." The electrode terminal 13 (e.g., negative electrode terminal 13B) of the second wiring module 20B is an example of a "second electrode terminal." The battery module 10 to which the second wiring module 20B is attached is an example of a "second battery module." In the present embodiment, the first wiring module 20A and the second wiring module 20B form an example of a connection module set MS.

[0062] (First wiring module) First, the first wiring module 20A will be described. The first wiring module 20A has a first base 30A as the base 30. The first wiring module 20A also has a first electrode connection member 40A as the electrode connection member 40. The first electrode connection member 40A is, for example, a male engaging member. The first electrode connection member 40A is made of metal. The first electrode connection member 40A has a base end 41A that is connected to the electrode terminal 13 of the first battery module 10, and a tip end 42A that is physically and electrically connected to the electrode connection member 40 of the second wiring module 20B.

[0063] The base end portion 41A includes plate portions extending in the Y and Z directions. When viewed from the Y direction, the base end portion 41A overlaps with the first end portion 11EA of the first battery module 10. The base end portion 41A faces the electrode terminal 13 (e.g., the positive electrode terminal 13A) of the first battery module 10 from the +X direction side. The tip end portion 42A protrudes in the +X direction from the end portion of the base end portion 41A on the -Y direction side. The tip end portion 42A includes plate portions 42p extending in the X and Z directions. The tip end portion 42A protrudes in the +X direction, for example, beyond the end face of the case 11 of the first wiring module 20A on the +X direction side. The tip end portion 42A is an example of a "protruding end portion."

[0064] In this embodiment, the Z-direction width 40W1 of the first electrode connection member 40A is larger than the X-direction width 40W2 of the first electrode connection member 40A and is larger than the Y-direction width 40W3 of the first electrode connection member 40A. Furthermore, the Z-direction width 40W1 of the first electrode connection member 40A is larger than the protrusion amount 40W4 of the first electrode connection member 40A from the end face of the first base 30A on the +X-direction side. For example, the Z-direction width 40W1 of the first electrode connection member 40A is at least twice the protrusion amount 40W4 of the first electrode connection member 40A. For example, the Z-direction width 40W1 of the first electrode connection member 40A is the same as the Z-direction width 13W1 (or width 13W3) of the electrode terminal 13 of the battery module 10 described above.

[0065] In this embodiment, the first base 30A of the first wiring module 20A has a first engagement portion 70A. The first engagement portion 70A includes, for example, a protrusion 71 that protrudes in the +X direction. The protrusion 71 is, for example, a pin that protrudes linearly in the +X direction.

[0066] (Second wiring module) Next, the second wiring module 20B will be described. The second wiring module 20B has a second base 30B as the base 30. The second wiring module 20B also has a second electrode connection member 40B as the electrode connection member 40. The second electrode connection member 40B is, for example, a female engagement member. The second electrode connection member 40B is made of metal. The second electrode connection member 40B has a base end 41B connected to the electrode terminal 13 of the second battery module 10, and a tip end 42B physically and electrically connected to the electrode connection member 40 (first electrode connection member 40A) of the first battery module 10.

[0067] The base end portion 41B includes a plate portion extending along the Y direction and the Z direction. The base end portion 41B faces the electrode terminal 13 (e.g., the negative electrode terminal 13B) of the second battery module 10 from the -X direction side. The tip portion 42B extends from the base end portion 41B in the -X direction. The tip portion 42B includes a space into which the tip portion 42A (protruding end portion) of the first wiring module 20A is inserted along the X direction. The tip portion 42B holds the tip portion 42A (protruding end portion) of the inserted first wiring module 20A. The tip portion 42B is an example of a "holding portion."

[0068] An example of the second electrode connecting member 40B will be described below. In this embodiment, the tip portion 42B includes a support member 44. The support member 44 is a member that supports a leaf spring member 45, which will be described later. The support member 44 has, for example, a first portion 44a, a second portion 44b, and a third portion 44c.

[0069] The first portion 44a is a plate portion extending along the Y and Z directions. The first portion 44a faces the electrode terminal 13 (e.g., the negative electrode terminal 13B) of the second battery module 10 from the -X direction side. The first portion 44a is joined to the electrode terminal 13 of the second battery module 10. The first portion 44a is physically and electrically connected to the electrode terminal 13 of the second battery module 10.

[0070] The second portion 44b is a plate portion extending along the X and Z directions. The second portion 44b extends in the +X direction from the end of the first portion 44a on the -Y direction side. In this embodiment, the second portion 44b extends in the +X direction beyond the electrode terminal 13 of the second battery module 10. The third portion 44c is a plate portion extending along the Y and Z directions. The third portion 44c extends in the -Y direction from the end of the second portion 44b on the +X direction side. The third portion 44c is located on the +X direction side relative to the electrode terminal 13 of the second battery module 10.

[0071] In this embodiment, the tip portion 42B includes a leaf spring member 45. The leaf spring member 45 is joined to and supported by the support member 44. The leaf spring member 45 includes, for example, a pair of clamping portions 45a and 45b, a base portion 45c, and an insertion space 46.

[0072] The base 45c is located at the end of the leaf spring member 45 on the +X direction side. The base 45c extends along the Y and Z directions. The clamping portions 45a and 45b extend in the -X direction from both Y direction ends of the base 45c. The clamping portions 45a and 45b are spaced apart in the Y direction. The +X direction end of each of the clamping portions 45a and 45b is supported by the base 45c. The clamping portions 45a and 45b are elastically deformable in the Y direction. For example, the clamping portions 45a and 45b are elastically deformable relative to the base 45c. The insertion space 46 exists between the clamping portions 45a and 45b.

[0073] In this embodiment, when the first wiring module 20A and the second wiring module 20B are connected, the tip portion 42A (protruding end portion) of the first wiring module 20A is inserted between the clamping portions 45a, 45b of the second wiring module 20B. The tip portion 42A of the first wiring module 20A is press-fitted toward the back of the insertion space 46 while elastically deforming the clamping portions 45a, 45b so as to widen the gap (insertion space 46) between the clamping portions 45a, 45b in the Y direction.

[0074] In this case, the tip portion 42A of the first electrode connecting member 40A is pressed from both sides in the Y direction by the clamping portions 45a and 45b. This physically and electrically connects the first electrode connecting member 40A and the second electrode connecting member 40B. In other words, the first wiring module 20A and the second wiring module 20B are physically and electrically connected. In this embodiment, the plate portion 42p of the tip portion 42A of the first wiring module 20A is clamped from both sides in the Y direction by the clamping portions 45a and 45b. In this embodiment, the first electrode connecting member 40A and the second electrode connecting member 40B form an example of an electrode connecting member set TS.

[0075] In this embodiment, the leaf spring member 45 is joined to the second portion 44b and the third portion 44c of the support member 44 and is supported by the second portion 44b and the third portion 44c of the support member 44. In this embodiment, the base portion 45c of the leaf spring member 45 is located on the +X direction side relative to the electrode terminals 13 of the second battery module 10. The clamping portions 45a, 45b extend long in the -X direction from the base portion 45c beyond the electrode terminals 13 of the second battery module 10. Such long clamping portions 45a, 45b are more likely to elastically deform in the Y direction than short clamping portions.

[0076] In this embodiment, the Z-direction width 40W5 of the second electrode connection member 40B is larger than the X-direction width 40W6 of the second electrode connection member 40B. For example, the Z-direction width 40W5 of the second electrode connection member 40B is the same as the Z-direction width 13W1 (or width 13W3) of the electrode terminal 13 of the battery module 10 described above.

[0077] In this embodiment, the second base 30B of the second wiring module 20B has a second engagement portion 70B. The second engagement portion 70B includes, for example, an engagement hole 72 recessed in the +X direction. The protrusion 71 of the first wiring module 20A is inserted into the engagement hole 72 to engage with (for example, fit).

[0078] The arrangement of the positive electrode terminal 13A and the negative electrode terminal 13B may be reversed from the above example. That is, the base end portion 41A of the first wiring module 20A may be connected to the negative electrode terminal 13B of the first battery module 10, and the base end portion 41B of the second wiring module 20B may be connected to the positive electrode terminal 13A of the second battery module 10. The arrangement of the first electrode connection member 40A and the second electrode connection member 40B may be reversed from the above example. That is, the first wiring module 20A may have the second electrode connection member 40B, and the second wiring module 20B may have the first electrode connection member 40A. The arrangement of the protrusion 71 and the engagement hole 72 may be reversed from the above example. That is, the first engagement portion 70A of the first wiring module 20A may have the engagement hole 72, and the second engagement portion 70B of the second wiring module 20B may have the protrusion 71.

[0079] In this embodiment, the first wiring module 20A and the second wiring module 20B are combined with each other after the first wiring module 20A is attached to the first battery module 10 and the second wiring module 20B is attached to the second battery module 10.

[0080] Next, the configuration of the electrode connection members 40 of the wiring modules 20C and 20D will be described with reference to FIG. 4. The configuration of the electrode connection member 40 of the wiring module 20C can be understood by replacing the "-Y direction" with the "+Y direction" in the above description of the second electrode connection member 40B of the wiring module 20B. The configuration of the electrode connection member 40 of the wiring module 20D can be understood by replacing the "-Y direction" with the "+Y direction" in the above description of the first electrode connection member 40A of the wiring module 20A. In this embodiment, the wiring module 20C and the wiring module 20D form an example of another connection module set MS.

[0081] Next, the wiring module 20E will be described with reference to Fig. 2. The wiring module 20E is located furthest in the -X direction among the multiple wiring modules 20. The wiring module 20E has external connection terminals ES to be connected to external components of the battery pack 1 (for example, a power supply unit to a vehicle body on which the battery pack 1 is mounted).

[0082] <5. Routing module> Next, the wiring module 80 will be described. 11 is a perspective view showing the wiring module 80. The wiring module 80 is a component for collecting signals obtained from the multiple wiring modules 20 and transmitting them to the outside. The wiring module 80 includes, for example, a base 81, multiple individual connectors 82, a wiring member 83, and a joint connector 84.

[0083] <5.1 Base> The base 81 is a member that serves as a base of the wiring module 80. The base 81 is formed of an insulating material such as synthetic resin and has insulating properties. The base 81 extends in the X direction. The base 81 faces the multiple wiring modules 20 from the +Z direction side.

[0084] <5.2 Individual Connectors> The individual connectors 82 are connection parts for connection to each wiring module 20. The multiple individual connectors 82 are attached to the surface of the base 81 on the -Z direction side. The individual connectors 82 are connected to wiring members 83. The individual connectors 82 are arranged at positions corresponding to the connectors 62 of each wiring module 20. The individual connectors 82 are detachably connected to the connectors 62 of each wiring module 20 from the +Z direction.

[0085] <5.3 Wiring materials> The wiring member 83 is a member having wiring 83a (see FIG. 9) for transmitting signals obtained through the individual connectors 82 to the joint connector 84. The wiring member 83 is, for example, a flat wiring material. The wiring member 83 is a flexible flat cable (FFC), a flexible printed circuit (FPC), or the like. The wiring member 83 is in the form of a film extending along the X and Y directions. The wiring 83a of the wiring member 83 is electrically connected to the plurality of wirings 53 provided in each of the plurality of wiring modules 20 via the plurality of individual connectors 82.

[0086] <5.4 Joint Connector> The joint connector 84 is a connector that is detachably connected to a signal processing unit that processes signals related to the battery pack 1 (for example, a monitoring unit that monitors the state of the battery pack 1). The signal processing unit may exist as part of the battery pack 1, or may exist as an external device to the battery pack 1. The joint connector 84 is disposed, for example, at the end of the wiring module 80 on the +X direction side. The joint connector 84 transmits information obtained from the plurality of wiring modules 20 via the plurality of individual connectors 82 to the signal processing unit.

[0087] <6. Other configurations> Next, returning to FIG. 1, the insulating member 91, the end plate 92, and the connecting member 93 will be described.

[0088] 6.1 Insulating materials The multiple insulating members 91 include a first insulating member 91A and a second insulating member 91B. The first insulating member 91A and the second insulating member 91B are each plate-shaped along the Y and Z directions. The first insulating member 91A and the second insulating member 91B are elastic. For example, the first insulating member 91A and the second insulating member 91B are formed of an insulating material such as rubber and are elastic. The first insulating member 91A is disposed on the -X direction side of the multiple battery modules 10. The second insulating member 91B is disposed on the +X direction side of the multiple battery modules 10.

[0089] <6.2 End Plate> The multiple end plates 92 include a first end plate 92A and a second end plate 92B. The first end plate 92A and the second end plate 92B are each a plate member extending in the Y and Z directions. The first end plate 92A and the second end plate 92B are made of, for example, metal and have rigidity. The first end plate 92A is disposed on the -X direction side of the first insulating member 91A. The second end plate 92B is disposed on the +X direction side of the second insulating member 91B.

[0090] <6.3 Connecting members> The multiple connecting members 93 extend between the first end plate 92A and the second end plate 92B. The multiple connecting members 93 connect the first end plate 92A and the second end plate 92B. When the first end plate 92A and the second end plate 92B are connected by the connecting members 93, the first end plate 92A applies a pressing force to the multiple battery modules 10 via the first insulating member 91A. When the first end plate 92A and the second end plate 92B are connected by the connecting members 93, the second end plate 92B applies a pressing force to the multiple battery modules 10 via the second insulating member 91B. This restrains the multiple battery modules 10.

[0091] <7. Assembly method> Next, a method for assembling the battery pack 1 will be described. First, the wiring modules 20 are attached to the first end 11EA and the second end 11EB of each battery module 10. This results in a battery module assembly AS including one battery module 10 and two wiring modules 20 separated on both sides of the battery module 10 in the Y direction.

[0092] Next, the multiple battery module assemblies AS are arranged side by side in the X direction. For example, the leading end 42A (protruding end) of the first electrode connection member 40A of one battery module assembly AS (first battery module assembly) is inserted into the leading end 42B (holding portion) of the second electrode connection member 40B of another battery module assembly AS (second battery module assembly). At the same time, the protruding portion 71 of the first battery module assembly AS is engaged with the engaging hole 72 of the second battery module assembly AS.

[0093] Next, the stacked battery module assemblies AS are restrained by attaching a plurality of insulating members 91, a plurality of end plates 92, and a plurality of connecting members 93. Next, two wiring modules 80 are attached to the plurality of battery module assemblies AS. This completes the battery pack 1.

[0094] <8. Variations> Next, several modified examples will be described. Note that the configuration of each modified example other than that described below is the same as the configuration of the above-described embodiment.

[0095] 8.1 First Modification: Cell Balancing Circuit FIG. 12 is an electrical circuit diagram showing the configuration of a wiring module 20 of a first modified example. In this modified example, the wiring module 20 has a cell balancing circuit 110. The cell balancing circuit 110 is a circuit that corrects imbalances in the amounts of stored electricity among the plurality of battery cells 12. The cell balancing circuit 110 has, for example, a plurality of discharge units 111. The discharge units 111 are electrically connected between two adjacent voltage detection terminals 14. The discharge units 111 include, for example, a resistor 111a and a transistor 111b. The transistor 111b is electrically connected in series with the resistor 111a. The transistor 111b is switched between a conductive state and a non-conductive state based on a control signal received from the signal processing unit via the wiring module 80 so as to equalize the voltages or remaining capacities of the plurality of battery cells 12.

[0096] The resistor 111a and the transistor 111b are each a component used in association with the battery module 10. The discharge unit 111 (resistor 111a and transistor 111b) is provided, for example, in the main body 51 of the wiring member 50. The resistor 111a and the transistor 111b are each an example of an "electronic component." When the discharge unit 111 is formed by one chip component (integrated circuit component), the chip component is an example of an "electronic component."

[0097] 8.2 Second Modification: Signal Processing Section FIG. 13 is an electrical circuit diagram showing the configuration of a wiring module 20 of a second modified example. In this modified example, the wiring module 20 has a signal processing unit 120. The signal processing unit 120 is a functional unit that performs processing related to signals flowing through the wiring 53 of the wiring module 20. For example, the signal processing unit 120 is electrically connected between the plurality of voltage detection terminals 14 and the connector 62. The signal processing unit 120 includes, for example, one or more chip components (integrated circuit components) 121 that perform signal processing. The signal processing unit 120 (chip components 121) is provided, for example, in the main body 51 of the wiring member 50. The chip components 121 are components used in association with the battery module 10. The chip components 121 are an example of an "electronic component."

[0098] In this modification, the signal processing unit 120 performs processing related to the signals flowing from each voltage detection terminal 14 to the wiring 53. For example, the signal processing unit 120 detects the voltage value of the battery cell 12 based on the magnitude of the voltage applied from each voltage detection terminal 14 to the wiring 53. The signal processing unit 120 generates a signal indicating the detected voltage value of the battery cell 12.

[0099] The signal processing unit 120 also performs processing related to the signal flowing from the thermistor 61 to the wiring 53. For example, the signal processing unit 120 detects the temperature value of the battery cell 12 based on the voltage difference between both ends of the thermistor 61. The signal processing unit 120 generates a signal indicating the detected temperature value of the battery cell 12.

[0100] In this modification, the signal processing unit 120 includes a communication circuit unit 130. The communication circuit unit 130 is a circuit having a function of communicating with the signal processing unit. The communication circuit unit 130 converts signals generated by the signal processing unit 120 (for example, signals indicating the voltage values ​​of the battery cells 12 and / or signals indicating the temperature values ​​of the battery cells 12) into signals suitable for data communication, such as packets. The communication circuit unit 130 transmits the converted signals to the signal processing unit via the connector 62 and the wiring module 80 by data communication.

[0101] The communication circuit unit 130 includes, for example, one or more chip components (integrated circuit components) 131 that perform communication processing. The communication circuit unit 130 (chip components 131) is provided, for example, in the main body 51 of the wiring member 50. The chip components 131 are components used in association with the battery module 10. The chip components 131 are an example of an "electronic component."

[0102] In this modification, the signal processing unit 120 is connected to the connector 62 via one or more wires 54. The number of wires 54 between the signal processing unit 120 and the connector 62 is smaller than the number of wires 53 between the signal processing unit 120 and the plurality of voltage detection terminals 14. The communication circuit unit 130 sequentially transmits signals indicating the voltage values ​​of the plurality of voltage detection terminals 14 (the plurality of battery cells 12) at different timings. The communication circuit unit 130 outputs the signals indicating the voltage values ​​of the plurality of voltage detection terminals 14 (the plurality of battery cells 12) to the signal processing unit via a number of wires 54 that is smaller than the number of the plurality of voltage detection terminals 14.

[0103] The signal processing by the signal processing unit 120 is not limited to the above example. For example, instead of or in addition to the above example, the signal processing unit 120 may generate a control signal for operating the cell balancing circuit 110 based on the magnitude of the voltage applied from each voltage detection terminal 14 to the wiring 53, and output the generated control signal to the cell balancing circuit 110. Furthermore, the signal processing by the signal processing unit 120 may also include noise removal, averaging, or comparison with a preset threshold value of the signal obtained from the electrode terminal 13, the voltage detection terminal 14, or thermistor 61.

[0104] 8.3 Third Modification: First Alternative Embodiment of Electrode Connecting Member FIG. 14 is a side view showing the first wiring module 20A and the second wiring module 20B of the third modified example. In this modified example, the tip portion 42B of the second electrode connecting member 40B has a leaf spring member 45. The leaf spring member 45 includes a pair of clamping portions 45a and 45b, a base portion 45c, and an insertion space 46. The clamping portion 45a is plate-shaped and extends along the X and Z directions. Meanwhile, the clamping portion 45b is folded back toward the inside of the insertion space 46. The clamping portion 45b is elastically deformable in the Y direction. For example, the clamping portion 45b is elastically deformable in the Y direction relative to the base portion 45c.

[0105] In this modification, the tip portion 42A of the first wiring module 20A is press-fitted toward the back of the insertion space 46 while elastically deforming the clamping portions 45b so as to widen the gap (insertion space 46) between the clamping portions 45a, 45b in the Y direction. In this case, the tip portion 42A of the first wiring module 20A is pressed from both sides in the Y direction by the clamping portions 45a, 45b. For example, the plate portion 42p of the tip portion 42A of the first wiring module 20A is clamped from both sides in the Y direction by the clamping portions 45a, 45b.

[0106] In this modification, the clamping portion 45b has, for example, one or more (e.g., a plurality of) slits SL. The plurality of slits SL are spaced apart in the Z direction. Each of the plurality of slits SL extends in the +X direction from the −X direction end of the clamping portion 45b. When the slits SL are provided, even if the first electrode connection member 40A is tilted relative to the second electrode connection member 40B, the clamping portion 45b can elastically deform in accordance with the tilt of the first electrode connection member 40A. When the clamping portion 45b can elastically deform in accordance with the tilt of the first electrode connection member 40A, the first electrode connection member 40A and the second electrode connection member 40B are more likely to be connected more firmly.

[0107] 8.4 Fourth Modification: Second Alternative Embodiment of Electrode Connecting Member FIG. 15 is a side view showing a first wiring module 20A and a second wiring module 20B of a fourth modified example. The first wiring module 20A has a first electrode connection member 40A' as the electrode connection member 40. The first electrode connection member 40A' is, for example, a male engaging member. The first electrode connection member 40A' is, for example, a plate member extending in the X and Z directions. The first electrode connection member 40A' has a tip portion 42A' that protrudes in the +X direction. The tip portion 42A' includes plate portions 42p that extend in the X and Z directions. The tip portion 42A' is an example of a "protruding end portion."

[0108] The second wiring module 20B has a second electrode connecting member 40B' as the electrode connecting member 40. The second electrode connecting member 40B' is, for example, a female engaging member. The second electrode connecting member 40B' includes, for example, a cylindrical tip portion 42B' having a space into which the tip portion 42A' of the first electrode connecting member 40A' is inserted. The tip portion 42B' holds the tip portion 42A (protruding end portion) of the inserted first wiring module 20A. The tip portion 42B' is an example of a "holding portion."

[0109] In this modification, the tip portion 42B' has a tubular portion 140 with a slot. That is, the tip portion 42B' has a plurality of slits SL. Each of the plurality of slits SL extends in the +X direction from a first end 140a, which is the end of the tip portion 42B' on the -X direction side. By having the plurality of slits SL, the tip portion 42B' is likely to elastically deform toward the outer periphery of the tubular portion 140. For example, the tip portion 42B' is elastically deformable at least in the Y direction. In this modification, the tip portion 42B' is elastically deformable in the Y direction and the Z direction. The tubular portion 140 includes, for example, a pair of clamping portions 45a, 45b, a base portion 45c, and an insertion space 46.

[0110] In this modification, when the first wiring module 20A and the second wiring module 20B are connected, the tip portion 42A' (protruding end portion) of the first wiring module 20A is press-fitted toward the back of the insertion space 46 while elastically deforming the tip portion 42B' so as to spread the cylindrical tip portion 42B' (holding portion) of the second wiring module 20B outward (for example, so as to spread the gap between the clamping portions 45a and 45b in the Y direction). In this case, the tip portion 42A' of the first wiring module 20A is pressed from the outer periphery by the tip portion 42B' (for example, pressed from both sides in the Y direction by the clamping portions 45a and 45b). This physically and electrically connects the first wiring module 20A and the second wiring module 20B. The plate portion 42p of the tip portion 42A' of the first wiring module 20A is clamped from both sides in the Y direction by the clamping portions 45a and 45b.

[0111] <9. Advantages> <9.1 Advantages from the first perspective> As a comparative example, consider a battery pack in which multiple battery modules are arranged side by side, each battery module having multiple detection terminals, and each of the multiple detection terminals being individually attached to a corresponding electrical connection component. In this comparative example, the task of attaching the individual electrical connection components to each of the multiple detection terminals becomes complicated, which may reduce the ease of assembly of the battery pack. This tendency may become more pronounced as the number of battery modules included in a single battery pack increases as the battery pack capacity increases.

[0112] On the other hand, in this embodiment, the wiring module 20 includes an insulating base 30 and a wiring member 50. When the direction in which the battery modules 10 are arranged is defined as a first direction and a direction different from the first direction is defined as a second direction, the base 30 is disposed so as to face a first end 11EA of one of the battery modules 10 in the second direction. The wiring member 50 includes a main body 51 supported by the base 30 and a plurality of terminal connection portions 52A that branch off from the main body 51 and extend from the main body 51 to be individually connected to a plurality of detection terminals (e.g., voltage detection terminals 14) provided at the first end 11EA of the battery modules 10. With this configuration, even when the battery module 10 has a plurality of detection terminals, electrical connection to the plurality of detection terminals can be achieved by a single wiring member 50. Being able to electrically connect the plurality of detection terminals by a single wiring member 50 improves the workability of assembling the battery pack 1 compared to a case in which individual electrical connection components are attached to each of the plurality of detection terminals.

[0113] In this embodiment, the multiple voltage detection terminals 14 include three or more detection terminals arranged in parallel. The multiple terminal connection portions 52A include three or more terminal connection portions 52A that are connected to the three or more detection terminals, respectively. With this configuration, even when there are three or more detection terminals arranged in parallel, electrical connection to the three or more detection terminals can be easily achieved.

[0114] In this embodiment, the base 30 has a plurality of partition walls 34 that electrically insulate the plurality of detection terminals. The plurality of terminal connection portions 52A extend separately into the interiors of a plurality of regions R defined by the plurality of partition walls 34. With this configuration, the plurality of terminal connection portions 52A can extend separately into the interiors of a plurality of regions R defined by the plurality of partition walls 34. If the plurality of terminal connection portions 52A can extend separately into the interiors of a plurality of regions R, a higher level of insulation between the plurality of terminal connection portions 52A can be ensured.

[0115] In this embodiment, the multiple detection terminals are arranged side by side in a third direction different from the first direction and the second direction. The multiple terminal connection portions 52A are arranged so as to individually face the multiple detection terminals from the first direction. With this configuration, the direction in which the multiple detection terminals are arranged differs from the direction in which the multiple terminal connection portions 52A are connected to the multiple detection terminals. When these directions differ, the gaps between the multiple detection terminals can be made smaller than when the detection terminals and the terminal connection portions 52A are connected in, for example, the third direction. Reducing the gaps between the multiple detection terminals makes it easier to miniaturize the battery pack 1.

[0116] In this embodiment, the main body 51 of the wiring member 50 is disposed so as to face the base 30 from the second direction. The multiple terminal connection portions 52A are bent from the main body 51 and disposed so as to face the multiple detection terminals individually from the first direction. With this configuration, the main body 51, which has a larger area than the terminal connection portions 52A, can be disposed along the first direction. If the main body 51 can be disposed along the first direction, it becomes easier to reduce the size of the battery pack 1.

[0117] In this embodiment, the wiring module 20 has an electrode connection member 40. The electrode connection member 40 includes a base end 41 electrically connected to an electrode terminal 13 of one battery module 10 and a tip end 42 electrically connected to an electrode terminal 13 of another battery module 10. The wiring member 50 further has a terminal connection portion 52B connected to the electrode connection member 40. With this configuration, the terminal connection portion 52B connected to the electrode connection member 40 and the multiple terminal connection portions 52A connected to the multiple detection terminals can be realized by a single wiring member 50. Realizing the terminal connection portion 52B and the multiple terminal connection portions 52A by a single wiring member 50 further improves the ease of assembly of the battery pack 1.

[0118] In this embodiment, the wiring module 20 further includes a thermistor 61 for detecting a temperature associated with the battery module 10. The wiring member 50 further includes a thermistor connection portion 52C connected to the thermistor 61. With this configuration, the thermistor connection portion 52C and the multiple terminal connection portions 52A can be realized by a single wiring member 50. By realizing the thermistor connection portion 52C and the multiple terminal connection portions 52A by a single wiring member 50, the workability of assembling the battery pack 1 can be further improved.

[0119] In the present embodiment, the wiring module 20 further includes a connector 62 that is supported by the base 30 and to which the wiring module 80 is detachably connected. The main body 51 is connected to the connector 62. With this configuration, it is possible to improve the workability of assembling the battery pack 1 inside the wiring module 20 that is attached to each battery module 10.

[0120] In this first aspect, no electronic components may be provided on the wiring member 50. Furthermore, the electrode terminals 13 of the plurality of battery modules 10 may be connected using a connection structure that is fastened with bolts.

[0121] <9.2 Advantages from the second perspective> As a comparative example, consider a battery pack including multiple battery modules, in which electronic components used in association with each battery module are collectively arranged in a signal processing unit (e.g., a monitoring device) of the battery pack. In this comparative example, it may be difficult to reduce the size of the battery pack because the wiring between each battery module and the signal processing unit becomes complicated and / or the signal processing unit (e.g., a monitoring device) tends to become larger due to the collectively arranged electronic components. This tendency may become more pronounced when the number of battery modules included in a single battery pack increases as the capacity of the battery pack increases.

[0122] On the other hand, in this embodiment, the wiring module 20 includes an insulating base 30, a wiring member 50, and electronic components. When a first direction is defined as a direction in which the plurality of battery modules 10 are arranged and a second direction is defined as a direction different from the first direction, the base 30 is disposed so as to face a first end 11EA of one of the battery modules 10 included in the plurality of battery modules 10 in the second direction. The wiring member 50 includes a main body 51 supported by the base 30 and a terminal connection portion 52A (or a terminal connection portion 52B) extending from the main body 51 and connected to a detection terminal provided at the first end 11EA of the battery module 10. The electronic components are provided on the wiring member 50 and used in association with the battery module 10. With this configuration, the wiring module 20 is used to arrange the electronic components, thereby simplifying the wiring between the wiring module 20 and a signal processing unit (e.g., a monitoring device) and / or preventing a large number of electronic components from being arranged together in the signal processing unit (e.g., a monitoring device). As a result, it becomes easier to achieve a reduction in size of the battery pack 1. Note that simplification of wiring means, for example, reducing the number of wires, simplifying the wiring layout, or removing or reducing protection functions.

[0123] In this embodiment, the electronic components are electrically connected to the detection terminals of the battery module 10 via the terminal connection portion 52A (or the terminal connection portion 52B). With this configuration, processing or operations related to the state of the detection terminals of the battery module 10 can be performed near the battery module 10. If such processing or operations can be performed near the battery module 10, the wiring between the wiring module 20 and the signal processing unit can be further simplified. As a result, it becomes easier to further miniaturize the battery pack 1.

[0124] In this embodiment, the wiring module 20 further includes a connector 62 to which a wiring module 80 of the battery pack 1 is detachably connected. The electronic components are electrically connected between the terminals of the battery module 10 and the connector 62. With this configuration, the wiring between the wiring module 20 and the signal processing unit can be simplified, thereby simplifying the wiring module 80. Note that simplification of the wiring module means, for example, reducing the number of wires in the wiring module, simplifying the wiring layout, or removing or reducing protection functions.

[0125] In the present embodiment, the main body 51 of the wiring member 50 is disposed so as to face the base 30 from the second direction. The terminal connection portion 52A is bent from the main body 51 and disposed so as to face the detection terminal of the battery module 10 from the first direction. The electronic component is provided in the main body 51 of the wiring member 50. According to this configuration, the electronic component is disposed in the second direction, which is more likely to have a spatial surplus than in the first direction, and therefore, even when the electronic component is provided in the wiring module 20, it is easier to prevent the wiring module 20 from becoming larger. Furthermore, by providing the electronic component in the main body 51, the electronic component can be mounted more stably than when the electronic component is provided in the terminal connection portion 52A.

[0126] In this embodiment, the electronic component is a fuse component 63 electrically connected to the detection terminal of the battery module 10. With this configuration, a protection function related to the state of the detection terminal of the battery module 10 can be provided near the battery module 10, which makes it easier to simplify the wiring between the wiring module 20 and the signal processing unit.

[0127] In this embodiment, the wiring module 20 further includes a cell balance circuit 110 provided in the wiring member 50. The electronic components are components (e.g., resistors 111a or transistors 111b) included in the cell balance circuit 110. With this configuration, the cell balance circuits 110 corresponding to each battery module 10 can be provided near the battery module 10, which makes it easier to simplify the wiring between the wiring module 20 and the signal processing unit.

[0128] In this embodiment, the wiring module 20 further includes an information processing unit 120 that is provided on the wiring member 50 and performs processing related to signals obtained from the detection terminals of the battery modules 10. The electronic components are included in the information processing unit 120. With this configuration, signal processing corresponding to each battery module 10 can be performed near the battery module 10, which makes it easier to simplify the wiring between the wiring module 20 and the signal processing unit.

[0129] In this embodiment, the wiring module 20 further includes a communication circuit unit 130 that converts and transmits signals obtained from the detection terminals of the battery module 10. The electronic components are included in the communication circuit unit 130. With this configuration, information detected inside the wiring module 20 can be transmitted via data communication. This makes it easier to reduce the number of wires between the wiring module 20 and the signal processing unit.

[0130] In this second aspect, the wiring member 50 does not have to have a plurality of terminal connection portions 52A that branch off from each other. Also, the electrode terminals 13 of the plurality of battery modules 10 may be connected using a connection structure that is fastened with bolts.

[0131] <9.3 Advantages from the third perspective> As a comparative example, consider a battery pack in which multiple battery modules are arranged in a first direction, and when connecting the electrodes of the multiple battery modules, a connection structure is realized by fastening bolts from a direction different from the first direction. In the configuration of this comparative example, the work of connecting the electrodes of the multiple battery modules by fastening bolts becomes complicated, which may reduce the ease of assembly of the battery pack. This tendency may become more pronounced when the number of battery modules included in one battery pack increases as the capacity of the battery pack increases.

[0132] On the other hand, in this embodiment, the connection module set MS is a component set used in a battery pack 1 including a first battery module 10 and a second battery module 10 adjacent to the first battery module 10 in a first direction. The connection module set MS has a first wiring module 20A and a second wiring module 20B. The first wiring module 20A includes an insulating first base 30A and a first electrode connection member 40A supported by the first base 30A. The first base 30A is disposed opposite the first end 11EA of the first battery module 10. The first electrode connection member 40A includes a base end 41A electrically connected to the first electrode terminal 13 of the first battery module 10 and a tip end 42A (protruding end) protruding in the first direction. The second wiring module 20B includes an insulating second base 30B and a second electrode connection member 40B supported by the second base 30B. The second base 30B is disposed opposite the first end 11EA of the second battery module 10. The second electrode connection member 40B includes a base end 41B electrically connected to the second electrode terminal 13 of the second battery module 10, and a tip end 42B (holding portion) into which the tip end 42A (protruding end portion) of the first electrode connection member 40A is inserted and held. With this configuration, the first electrode connection member 40A is held by the second electrode connection member 40B as the two battery modules 10 are arranged side by side in the first direction. When such a holding structure is provided, the assembly workability of the battery pack 1 can be improved compared to when such a holding structure is not provided.

[0133] In the present embodiment, the tip portion 42B (holding portion) of the second electrode connection member 40B has a portion that is elastically deformable in a direction intersecting the first direction, and holds the tip portion 42A (protruding end portion) of the first electrode connection member 40A. With this configuration, the tip portion 42A of the first electrode connection member 40A is more firmly held by elastically deforming at least a portion of the tip portion 42B (holding portion) of the second electrode connection member 40B. When the tip portion 42A of the first electrode connection member 40A is more firmly held, it becomes easier to further improve the ease of assembly of the battery pack 1. Note that in the present disclosure, the "direction intersecting the first direction (e.g., X direction)" is not limited to the second direction (e.g., Y direction) and may be a third direction (e.g., Z direction).

[0134] In the present embodiment, the tip portion 42B (holding portion) of the second electrode connection member 40B is elastically deformable at least in the second direction and includes clamping portions 45a, 45b that clamp the tip portion 42A (protruding end portion) of the first electrode connection member 40A from both sides in the second direction. With this configuration, the tip portion 42A (protruding end portion) of the first electrode connection member 40A is clamped and becomes less likely to come off, which further facilitates improving the workability of assembling the battery pack 1.

[0135] In this embodiment, when a direction intersecting the first direction and the second direction is defined as a third direction, the tip end 42A (protruding end) of the first electrode connection member 40A includes a plate portion 42p that extends along the first direction and the third direction. The clamping portions 45a and 45b clamp the plate portion 42p from both sides in the second direction. This configuration can ensure a large connection structure between the tip end 42A of the first electrode connection member 40A and the clamping portions 45a and 45b while preventing the width of the battery pack 1 from increasing in the Y direction.

[0136] In the present embodiment, the tip portion 42B (holding portion) of the second electrode connecting member 40B includes a tubular portion 140. The tubular portion 140 includes a first end 140a on the first wiring module 20A side, and a plurality of slits SL each extending from the first end 140a in a direction away from the first wiring module 20A. With this configuration, it is possible to realize a structure in which the tip portion 42A (protruding end portion) of the first electrode connecting member 40A is held by the tubular portion 140 having the slits SL.

[0137] In this embodiment, one of the first base 30A and the second base 30B includes a protrusion 71 that protrudes in the first direction. The other of the first base 30A and the second base 30B includes an engagement hole 72 into which the protrusion 71 is inserted. With this configuration, in addition to connecting the first electrode connecting member 40A and the second electrode connecting member 40B, the first base 30A and the second base 30B are engaged with each other, allowing for more stable assembly work.

[0138] In the present embodiment, the first wiring module 20A and the second wiring module 20B are combined with each other after the first wiring module 20A is attached to the first battery module 10 and the second wiring module 20B is attached to the second battery module 10. With this configuration, the first electrode connection member 40A and the second electrode connection member 40B can be connected as part of the process of arranging the multiple battery modules 10 in the first direction.

[0139] In this third aspect, the wiring member 50 does not have to have a plurality of terminal connection portions 52A that branch off from each other. Also, the wiring member 50 does not have to be provided with any electronic components.

[0140] The above describes the embodiment and several modified examples. However, the embodiment and modified examples are not limited to the examples described above. For example, the modified examples described above may be combined with each other. In the above embodiment, the battery module 10 is a bipolar battery module. Alternatively, the battery module 10 may be a monopolar battery module. The first wiring module 20A may not have a base 30. That is, the first electrode connection member 40A may be attached directly to the battery module 10. The second wiring module 20B may not have a base 30. That is, the second electrode connection member 40B may be attached directly to the battery module 10. [Explanation of symbols]

[0141] 1. Battery pack 10...Battery module 11...Case 12...Battery cell 13...Electrode terminal (detection terminal) 13A...Positive electrode terminal (detection terminal) 13B...Negative electrode terminal (detection terminal) 14...Voltage detection terminal (detection terminal) 20, 20A, 20B, 20C, 20D, 20E...Wiring module 30...Base 30A…1st base 30B…Second base 34...Partition wall 40...Electrode connecting member 40A...first electrode connecting member 40B...Second electrode connecting member 41... Proximal end of electrode connecting member 41A...base end portion of first electrode connecting member 41B...base end portion of second electrode connecting member 42...Tip of electrode connecting member 42A...Tip portion (protruding end portion) of first electrode connecting member 42B...Tip portion (holding portion) of second electrode connecting member 45a, 45b...gripping part 50...Wiring material 51...Main body 52A, 52B...Terminal connection part 53...Wiring 61...Thermistor 62...Connector 63...Fuse parts 110...Cell balance circuit 111...Discharge part (electronic component) 111a...Resistor (electronic component) 111b...Transistor (electronic component) 120...Information processing section 121...Chip components (electronic components) 130...Communication circuit section 131...Chip components (electronic components)

Claims

1. A component used in a battery pack in which a plurality of battery modules are arranged in a first direction, and a direction intersecting the first direction is a second direction, an insulating base body disposed opposite a first end portion in the second direction of one battery module included in the plurality of battery modules; a wiring member including: a main body supported on the base; a plurality of terminal connection parts that are bendable from the main body part and branch out from the main body part to extend from each other and are connected to a plurality of detection terminals provided at the first end of the battery module, and a plurality of wires that extend between the main body part and the plurality of terminal connection parts so as to be arranged corresponding to the plurality of terminal connection parts, respectively; a plurality of fuse components provided in correspondence with the plurality of wirings and connected to the corresponding wirings in the main body; A wiring module comprising:

2. A component used in a battery pack in which multiple battery modules are arranged in a first direction, and in which a direction intersecting the first direction is a second direction, an insulating base body disposed opposite a first end portion in the second direction of one battery module included in the plurality of battery modules; a wiring member including a main body supported by the base and a terminal connection portion extending from the main body and connected to a detection terminal provided at the first end of the battery module; an electronic component provided on the wiring member and used in association with the battery module; Equipped with the main body portion is disposed to face the base body in the second direction, the terminal connection portion is bent from the main body portion and is disposed so as to face the detection terminal in the first direction; The electronic component is provided in the main body portion. Wiring module.

3. the electronic component is electrically connected to the detection terminal via the terminal connection portion; The wiring module according to claim 2 .

4. a connector supported by the base and to which a wiring module of the battery pack is detachably connected; the electronic component is electrically connected between the detection terminal and the connector; The wiring module according to claim 2 or 3.

5. the electronic component is a fuse component electrically connected to the detection terminal; The wiring module according to claim 2 or 3.

6. The power supply further includes a cell balance circuit provided in the wiring member, the electronic component is a component included in the cell balancing circuit, The wiring module according to claim 2 or 3.

7. an information processing unit that is provided in the wiring member and that processes signals obtained from the detection terminals; the electronic component is a component included in the information processing unit, The wiring module according to claim 2 or 3.

8. a communication circuit unit provided in the wiring member for converting and transmitting a signal obtained from the detection terminal; the electronic component is a component included in the communication circuit unit, The wiring module according to claim 2 or 3.

9. a plurality of battery modules arranged side by side in a first direction; a wiring module having an insulating base, a wiring member, and a plurality of fuse components, wherein, when a direction intersecting the first direction is defined as a second direction, the base is disposed opposite a first end of one of the battery modules in the second direction, the wiring member including a main body supported by the base, a plurality of terminal connection parts that are bendable from the main body part and branch out from the main body part to extend and be connected to a plurality of detection terminals provided at the first end of the battery module, and a plurality of wires that extend between the main body part and the plurality of terminal connection parts so as to be disposed corresponding to the plurality of terminal connection parts, and the plurality of fuse components are provided corresponding to the plurality of wires, and are connected to midpoints of the corresponding wires in the main body part; A battery pack equipped with

10. A plurality of battery modules arranged in a first direction; a wiring module having an insulating base, a wiring member, and an electronic component, wherein, when a direction intersecting the first direction is defined as a second direction, the base is disposed opposite a first end of one battery module included in the plurality of battery modules in the second direction, the wiring member includes a main body portion supported by the base, and a terminal connection portion extending from the main body portion and connected to a detection terminal provided at the first end of the battery module, and the electronic component is provided on the wiring member and used in association with the battery module; Equipped with the main body portion is disposed to face the base body in the second direction, the terminal connection portion is bent from the main body portion and is disposed so as to face the detection terminal in the first direction; The electronic component is provided in the main body portion. Battery pack.

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