Energy storage device

Abstract

To facilitate the connection between energy storage cells and conductive members, and to maintain these connections. [Solution] The energy storage device comprises an energy storage cell 10 having electrode terminals 12 and a conductor member E1. The conductor member E1 has a housing portion R1 and a through hole R2 connecting the surface of the conductor member E1 to the housing portion R1. The energy storage device further comprises a receiving member 250 positioned in the housing portion R1. The electrode terminals 12 are connected to the receiving member 250 through the through hole R2 and are electrically connected to the conductor member E1 outside the through hole R2 in the housing portion R1.

Description

【Technical Field】 【0001】 The present disclosure relates to a power storage device. 【Background Art】 【0002】 Chinese Patent Application Publication No. 116686151 (Patent Document 1) discloses a power storage device including a plurality of power storage cells fixed within a case (accommodation cavity). The electrode terminals of each power storage cell are provided facing the bottom wall of the case. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Specification of Chinese Patent Application Publication No. 116686151 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 In the power storage device described in Patent Document 1 above, connecting the power storage cell and the bus bar (conductor member) and maintaining their connection are not necessarily easy. 【0005】 The present disclosure has been made to solve the above problems, and its object is to facilitate the connection between the power storage cell and the conductor member and the maintenance of these connections. 【Means for Solving the Problems】 【0006】 According to one aspect of the present disclosure, a power storage device is provided. The power storage device includes a power storage cell having an electrode terminal and a conductor member. The conductor member is formed with a receiving portion and a through hole connecting the receiving portion to the surface of the conductor member. The power storage device further includes a receiving member disposed in the receiving portion. The electrode terminal is connected to the receiving member through the through hole and is electrically connected to the conductor member outside the through hole in the receiving portion. 【Effects of the Invention】 【0007】 According to this disclosure, it becomes possible to facilitate the connection between energy storage cells and conductive members, and the maintenance of these connections. [Brief explanation of the drawing] 【0008】 [Figure 1] This is a diagram illustrating the outline of an energy storage device according to an embodiment of the present disclosure. [Figure 2] This diagram shows the inside of the energy storage device according to this embodiment. [Figure 3] Figure 2 is an end view of the energy storage device along line III-III. [Figure 4] This diagram illustrates the connection structure between the electrode terminals of a power storage cell and the wiring board. [Figure 5] This is a diagram illustrating the manufacturing method of a wiring board according to this embodiment. [Figure 6] This figure shows a modified example of the configuration shown in Figure 4. [Modes for carrying out the invention] 【0009】 Embodiments of this disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and their descriptions will not be repeated. In the drawings used below, the X-axis, Y-axis, and Z-axis refer to three mutually orthogonal axes. Hereafter, the direction indicated by the arrows on the X-axis, Y-axis, and Z-axis will be indicated by a "+" sign, and the opposite direction will be indicated by a "-" sign. 【0010】 Figure 1 is a diagram illustrating the outline of the energy storage device according to this embodiment. 【0011】 Referring to Figure 1, the energy storage device B according to this embodiment includes a lower case 100 (first housing member), an upper cover 110 (second housing member), and a shear panel 120 (third housing member), which function as the housing of the energy storage device B. The lower case 100 opens upward (towards the +Z side) and houses a plurality of energy storage cells and various components related to these energy storage cells. As will be described in detail later, the lower case 100 houses the energy storage cells, a cooler, and a junction box (hereinafter referred to as "J / B") (see Figure 2). The upper cover 110 is positioned above the lower case 100 and functions as a lid for the lower case 100. The shear panel 120 is positioned below the lower case 100 (towards the -Z side) and suppresses impacts to the lower case 100 due to road surface interference. An exhaust passage is also formed between the lower case 100 and the shear panel 120. 【0012】 When the energy storage device B is mounted on the vehicle, for example, the -Z side is downward (downward in the vertical direction), the +Z side is upward (upward in the vertical direction), the -X side is the front of the vehicle, and the +X side is the rear of the vehicle. The energy storage device B may function as a drive energy storage device, commonly referred to as a "battery pack". The vehicle may be an electric vehicle (BEV) or another electric vehicle (xEV). 【0013】 The lower part of Figure 1 shows a view of the lower case 100 in an empty state (nothing contained inside) as seen from above (+Z side). The lower case 100 has a bottom wall 101 (bottom) and a peripheral wall 102 (periphery). The bottom wall 101 includes regions D1 to D5. The peripheral wall 102 includes side walls W1 to W4. Side walls W1, W2, W3, and W4 correspond to the -X side, +X side, -Y side, and +Y side ends of the lower case 100, respectively. Side wall W2 includes side walls W21 to W23. Brackets 121 and 122 are provided on side walls W21 and W23, respectively. Discharge valves 151 and 152 are provided on side wall W22. Side wall W22 is connected to side walls W3 and W4 via side walls W21 and W23, respectively. Brackets 131 and 132 are provided on side walls W3 and W4, respectively. Brackets 111 and 112 are provided on side wall W1. The energy storage device B is connected to the vehicle body (e.g., floor panel) by fastening each bracket to, for example, the floor member of the vehicle. 【0014】 The bottom wall 101 is provided with partition walls 103 and 104 extending in the Y direction. Partition wall 104 is located on the +X side of partition wall 103. Region D5 is a rectangular area located in the center of the lower case 100 and is partitioned by partition walls 103 and 104. Region D5 is the area where the wiring board 200 and energy storage stacks S1 to S6 (see Figure 2), which will be described later, are arranged. Region D5 is located between partition walls 103 and 104. 【0015】 In region D5, openings h1 are formed at the positions where each energy storage cell is placed. Each of the multiple openings h1 is positioned in the Z direction to face the valve 13 of the energy storage cell 10 (see Figure 3), which will be described later. Multiple openings h1 are arranged in the X direction to form rows of openings h1. A number of rows corresponding to the energy storage stack are formed in the bottom wall 101. The openings h1 are, for example, elongated holes that penetrate the bottom wall 101. However, the shape of the openings h1 can be changed as appropriate. The openings h1 are formed, for example, by punching. 【0016】 In this embodiment, cover members 141 to 146 are provided in region D5 of the bottom wall 101. As a result, all openings h1 formed in the bottom wall 101 are covered by the cover members 141 to 146. Each of the cover members 141 to 146 comprises a base material 105 that is elongated in the X direction and N lid portions 105a arranged in the X direction. In this embodiment, the number of energy storage cells included in one energy storage stack is also N. N is, for example, 20 or more and 50 or less. However, it is not limited to this, and N may be 2 or more and less than 20, or it may be more than 50. 【0017】 The base material 105 may have an adhesive on one side (the adhesive side). The base material 105 may be an adhesive tape, such as a PP (polypropylene) tape. N lid portions 105a are formed on the base material 105. In this embodiment, the lid portions 105a contain mica. The N lid portions 105a in the cover members 141, 142, 143, 144, 145, and 146 are each formed to cover the opening h1 located below the energy storage stacks S1, S2, S3, S4, S5, and S6 (see Figure 2), which will be described later. The size of the lid portion 105a is the same as or larger than the opening h1. For example, N lid portions 105a may be formed on the base material 105 by attaching N mica foils to the adhesive surface of the base material 105. Alternatively, N lid portions 105a may be formed on the base material 105 by forming N through holes in the base material 105 and providing mica foil in each of these through holes. The cover members 141 to 146 are attached, for example, to the upper surface (+Z side) of the bottom wall 101 via the adhesive surface of the base material 105. 【0018】 On the -Y side and +Y side of the area D5, area D3 and area D4 are provided respectively. On the outer side (-X side) of the partition wall 103, area D1 is provided. On the outer side (+X side) of the partition wall 104, area D2 is provided. Area D2 is the area where the battery circuit unit 30 (Fig. 2) is arranged. Area D2 is located at the +X side end of the lower case 100 and is partitioned by the partition wall 104 and the side wall W2. In this embodiment, each of the bottom wall 101, the peripheral wall 102, and the partition walls 103 and 104 is formed of metal. However, these materials can be changed as appropriate. 【0019】 Fig. 2 is a view of the inside of the lower case 100 (inside the power storage device B) with the upper cover 110 removed, seen from above. Referring to Fig. 2, between the lower case 100 and the upper cover 110, power storage stacks S1 to S6, a cooling device 20, a battery circuit unit 30, and a wiring board 200 are accommodated. Each of the power storage stacks S1 to S6 includes N power storage cells 10 arranged in the X direction. Details of the configuration of each power storage cell will be described later. The wiring board 200 has wiring patterns for the power storage stacks S1 to S6. The battery circuit unit 30 includes a circuit electrically connected to the power storage stacks S1 to S6. The battery circuit unit 30 may be a single unit or may include a plurality of units. 【0020】 The cooling device 20 includes ports 20A, 20B, pipes 21A, 21B extending in the Y direction, pipes 22A, 22B extending in the X direction, a plurality of coolers 22C extending in the Y direction, and a cooling pipe 23. These are connected in order from the upstream side as the port 20A, the pipe 21A, the pipe 22A, the cooling pipe 23, the pipe 22B, the pipe 21B, and the port 20B. Also, the pipe 22A and the pipe 22B are connected via a plurality of coolers 22C (cooling plates) arranged in the X direction. Coolers 22C are arranged between adjacent power storage cells in the power storage stacks S1 to S6. Those adjacent power storage cells are cooled by the refrigerant flowing through the flow path formed inside the cooler 22C. The cooler 22C has a flow path communicating with each of the pipes 22A and 22B. The cooling pipe 23 is configured to cool the battery circuit unit 30. 【0021】 Referring to FIGS. 1 and 2, ports 20A and 20B are provided on side wall W1. Port 20B is located on the +Y side of port 20A. Pipes 21A and 21B are arranged in region D1. Pipes 22A and 22B are arranged in region D3 and region D4 respectively. Cooling pipe 23 is arranged in region D2. A plurality of coolers 22C are arranged in region D5. The refrigerant supplied from port 20A to pipe 21A flows in pipe 21A toward the -Y side. The refrigerant flowing from pipe 21A into pipe 22A flows in pipe 22A toward the +X side toward cooling pipe 23 and also flows into the flow paths of each of the plurality of coolers 22C. The refrigerant flowing from pipe 22A into cooler 22C flows toward the +Y side toward pipe 22B while cooling power storage stacks S1 to S6. Further, the refrigerant flowing from pipe 22A into cooling pipe 23 flows toward the +Y side toward pipe 22B while cooling battery circuit unit 30. The refrigerant flowing from cooler 22C or cooling pipe 23 into pipe 22B flows in pipe 22B toward the -X side toward pipe 21B. Thereafter, the refrigerant flows in pipe 21B toward the -Y side and flows out from port 20B. The refrigerant may be a liquid (such as water, oil, antifreeze, etc.) or a gas. 【0022】 In this embodiment, wiring board 200 is arranged on the +Z side of bottom wall 101, and power storage stacks S1 to S6 are further arranged on the +Z side of wiring board 200. 【0023】 Figure 3 is an end view of the energy storage device B along line III-III in Figure 2. As shown in the perspective view on the left side of Figure 3, the energy storage cell 10 comprises a case 10a and an electrode body 10b housed in the case 10a. The case 10a is a rectangular case in the shape of a rectangular parallelepiped. The electrode body 10b may include one or more windings (for example, two windings). The windings have a structure in which, for example, a positive electrode sheet and a negative electrode sheet are wound with a separator in between. Each of the positive electrode sheet and the negative electrode sheet includes an electrode foil and an active material layer. The energy storage cell 10 is a secondary battery such as a lithium-ion battery, nickel-metal hydride battery, or sodium-ion battery. In this embodiment, a liquid-type lithium-ion battery is used as the energy storage cell 10. The case 10a houses the electrolyte together with the electrode body 10b. The type of secondary battery is arbitrary, and for example, it may be an all-solid-state secondary battery. Instead of a wound structure, a laminate (for example, a laminate in which a positive electrode sheet and a negative electrode sheet are laminated with a separator in between) may be used. 【0024】 The energy storage cell 10 has electrode terminals 11, 12 and a valve 13 on the same plane. Specifically, the electrode terminals 11, 12 and the valve 13 are provided on the surface F10 (vertically downward-facing surface) of the case 10a. The valve 13 functions as an exhaust valve. The case 10a is basically maintained in a sealed state. However, if the pressure inside the case 10a exceeds a first reference value, the valve 13 opens to reduce the pressure inside the case 10a. Also, the electrode terminals 11 and 12 are electrically connected to the positive electrode sheet and negative electrode sheet of the electrode body 10b, respectively, and function as positive and negative electrode terminals. The parts of the case 10a surrounding the electrode terminals 11 and 12 may be made of insulating material, and the other parts may be made of metal. However, the material of the case 10a is arbitrary and not limited to this. 【0025】 In this embodiment, each energy cell included in the energy storage stacks S1 to S6 has the same configuration (the configuration shown in Figure 3). By forming the energy storage stacks S1 to S6 using a common energy storage cell 10, the manufacturing of the energy storage device B becomes easier and manufacturing costs can be reduced. However, this is not limited to this, and each energy storage stack may include multiple types of energy storage cells. Also, the number of energy storage stacks can be changed as appropriate. The number of energy storage stacks may be one or more. 【0026】 Each energy cell in the energy storage stack S1 to S6 is electrically connected by the wiring pattern on the wiring board 200. An example of a wiring pattern is shown at the bottom of Figure 2. 【0027】 Specifically, the wiring board 200 comprises an insulating substrate 201a, a plurality of conductor members 211, a plurality of conductor members 212, a plurality of conductor members 213, a plurality of conductor members 214, a plurality of conductor members 215, a plurality of conductor members 216, conductor members 221-223, and conductor members 231-236. The insulating substrate 201a is formed of, for example, resin. Although omitted in Figure 2, the wiring board 200 further comprises an insulating sheet 201b, and a plurality of openings h2 (through holes) are formed in the insulating substrate 201a (first insulating layer) and the insulating sheet 201b (second insulating layer). Details of the structure of the wiring board 200 will be described later (see Figures 3 and 5). 【0028】 Each of the multiple conductor members 211 electrically connects the energy cells included in the energy storage stack S1. Each of the multiple conductor members 212 electrically connects the energy cells included in the energy storage stack S2. Each of the multiple conductor members 213 electrically connects the energy cells included in the energy storage stack S3. Each of the multiple conductor members 214 electrically connects the energy cells included in the energy storage stack S4. Each of the multiple conductor members 215 electrically connects the energy cells included in the energy storage stack S5. Each of the multiple conductor members 216 electrically connects the energy cells included in the energy storage stack S6. 【0029】 Conductor member 221 electrically connects energy storage stacks S1 and S2. Conductor member 222 electrically connects energy storage stacks S3 and S4. Conductor member 223 electrically connects energy storage stacks S5 and S6. Conductor members 231, 232, 233, 234, 235, and 236 electrically connect energy storage stacks S1, S2, S3, S4, S5, and S6 to the battery circuit unit 30, respectively. 【0030】 In this embodiment, a wiring pattern is formed by the above-mentioned conductor members. Each of the conductor members 211-216, 221-223, and 231-236 is, for example, a metal plate-shaped member. Each of the conductor members 221-223 may be a U-shaped plate-shaped member. Each conductor member may be a busbar. The material and shape of each conductor member are arbitrary. 【0031】 The wiring board 200 is electrically connected to the battery circuit unit 30. The battery circuit unit 30 includes a total positive terminal 31, a total negative terminal 32, a J / B 33, a fuse 34, and wires L1 to L4. The total positive terminal 31 is located at the positive terminal end of the entire energy storage device B (all energy storage cells). The total negative terminal 32 is located at the negative terminal end of the entire energy storage device B. Wire L1 electrically connects conductor member 232 and conductor member 233. Wire L2 electrically connects conductor member 234 and conductor member 235. A fuse 34 is provided on wire L2. Conductor member 236 is connected to the total positive terminal 31. Wire L3 electrically connects the total positive terminal 31 and J / B 33. Conductor member 231 is connected to the total negative terminal 32. Wire L4 electrically connects the total negative terminal 32 and J / B 33. J / B33 houses various electrical devices. J / B33 may include at least one of a relay, fuse, resistor, current sensor, and connector (e.g., a connector to an on-board charger). The battery circuit unit 30 may further include at least one of a BMS (Battery Management System) and an ECU (Electronic Control Unit). 【0032】 An opening may be formed in the partition wall 104 for passing the conductor members 231 to 236 through. Alternatively, a wire (e.g., a cable) connected to the wiring board 200 may be connected to the battery circuit unit 30 by passing over the partition wall 104. Note that partition walls 103 and 104 are not essential components. At least one of partition walls 103 and 104 may be omitted. 【0033】 In the energy storage stacks S1 to S6, "6 × N" energy storage cells 10 are arranged in a matrix with 6 rows in the Y direction and N rows in the X direction. In the wiring pattern shown in Figure 2, multiple parallel connections are connected in series. The N energy storage cells 10 are arranged so that the positional relationship between the electrode terminals 11 (positive terminal) and electrode terminals 12 (negative terminal) is reversed every two cells. Each of the conductor members 211 to 216 connects two energy storage cells in parallel in the corresponding energy storage stack, and the resulting parallel connections (multiple energy storage cells connected in parallel) are connected in series. The connection configuration of the multiple energy storage cells can be changed as appropriate. For example, the number of energy storage cells connected in parallel may be three or more, instead of two. Alternatively, all energy storage cells may be connected in series without forming parallel connections. 【0034】 The wiring board 200 has a substrate 201 as shown in Figure 3. The substrate 201 includes an insulating substrate 201a and an insulating sheet 201b. Multiple recesses R11 are formed in the insulating substrate 201a. A conductor member 211 and a receiving member 250 connected to the electrode terminals 11 of the energy storage cell 10 are arranged in one of the recesses R11. A conductor member 211 and a receiving member 250 connected to the electrode terminals 12 of the energy storage cell 10 are arranged in another recess R11. The insulating sheet 201b is located on the +Z side of the insulating substrate 201a and covers the +Z side surface of the conductor members arranged in each recess R11. Each of the electrode terminals 11 and 12 shown in Figure 3 is connected to the receiving member 250 by passing through the insulating sheet 201b and the conductor member 211. The tip of each of these electrode terminals 11 and 12 is plastically deformed inside the substrate 201 according to the surface shape of the receiving member 250, and is electrically connected (for example, by crimping) to the corresponding conductor member 211. 【0035】 In the substrate 201, openings h2, as shown in Figure 3, are formed at the same positions as opening h1 (Figure 1) in the XY plane. Each of the same number of openings h2 (6 × N) as opening h1 faces the valve 13 of the energy storage cell 10 in the Z direction. Openings h2 are, for example, elongated holes that penetrate the substrate 201. Openings h2 have larger dimensions than openings h1 in the XY plane. In the XY plane, opening h1 is located inside opening h2. As shown in Figure 3, each opening h2 is connected to opening h1 via a cover portion 105a. 【0036】 In the manufacturing of the energy storage device B, for example, after installing the wiring board 200 inside the lower case 100, the energy storage stacks S1 to S6 are mounted on the wiring board 200 with the surface F10 of each energy storage cell facing downwards in the vertical direction. Then, the battery circuit unit 30 is connected to the wiring board 200, and the cooling device 20 is installed inside the lower case 100. As a result, the inside of the lower case 100 is in the state shown in Figure 2. Of the cooling device 20, the cooler 22C may be installed inside the lower case 100 together with the energy storage stacks S1 to S6. After that, the remaining part of the cooling device 20 may be placed inside the lower case 100, and the pipes 22A and 22B may be connected to the cooler 22C. The wiring board 200 and the battery circuit unit 30 may each be fixed to the lower case 100 with an adhesive (for example, silicone adhesive). 【0037】 As shown in Figure 3, the upper cover 110 is joined to the upper surface (+Z side) of each of the side walls W1 to W4 (only side wall W3 is shown in Figure 3) via, for example, adhesive 110b, and further fastened with bolts 110a. In addition, the shear panel 120 is joined to the lower surface (-Z side) of each of the side walls W1 to W4 via, for example, adhesive 120b. Although not shown in Figure 3, the piping 22A shown in Figure 2 is located in the space V3 between the energy storage cell 10 located at the -Y end of the lower case 100 and the side wall W3. 【0038】 An exhaust passage P1 is formed between the bottom wall 101 of the lower case 100 and the shear panel 120. Each of the side walls W1 to W4 is formed in a hollow shape. An exhaust passage P3 is formed inside side wall W3. Although not shown, exhaust passages are also formed inside side walls W2 and W4 in a manner similar to the exhaust passage P3 of side wall W3. These exhaust passages are in communication with each other. In addition, exhaust holes connected to discharge valves 151 and 152 (Figure 2) are formed in side wall W2. These exhaust holes are in communication with the exhaust passages. 【0039】 When the internal pressure of the energy storage cell 10 exceeds a first reference value, valve 13 opens as shown in Figure 3. Then, the pressure and heat of the gas discharged from inside the energy storage cell 10 through valve 13 create a hole in the cover portion 105a facing valve 13. The gas discharged from the energy storage cell 10 flows into the exhaust passage P1 through this hole. Each of the discharge valves 151 and 152 shown in Figure 2 opens when the pressure in the exhaust passage exceeds a second reference value. The second reference value may be a pressure value lower than the first reference value. For example, check valves are used for each of the discharge valves 151 and 152. When at least one of the discharge valves 151 and 152 opens, the gas in each exhaust passage flows toward the opened discharge valve and is discharged to the outside of the energy storage device B through that valve. The thickness of the lid portion 105a provided on the lower case 100 (Figure 1) is set to a thickness such that a hole is created when the opposing valve 13 opens (for example, when the valve opens in a manner that causes ignition). 【0040】 A mica layer 120a (for example, mica foil) is provided on the inner (+Z side) surface of the shear panel 120. The mica layer 120a may be provided so as to overlap all of the cover portions 105a in the XY plane. The mica layer 120a protects the shear panel 120 from substances (gas, electrolyte, debris, etc.) released from the energy storage cell 10 through the cover portions 105a. 【0041】 Figure 4 is a diagram illustrating the connection structure between the electrode terminals of the energy storage cell 10 and the conductor members of the wiring board 200. Figure 4 shows the structure of one representative conductor member (conductor member 211), but in this embodiment, other conductor members included in the wiring board 200 also have the structure shown in Figure 4. The upper left plan view of Figure 4 shows an enlarged view of two conductor members 211 from the wiring pattern shown in Figure 2. Hereinafter, of these two conductor members 211, the conductor member 211 on the -Y side will also be referred to as "conductor member E1," and the conductor member 211 on the +Y side will also be referred to as "conductor member E2." The electrode terminals 12 of the two energy storage cells 10, which are aligned in the X direction, are connected to conductor member E1. Hereinafter, of these two energy storage cells 10, the energy storage cell 10 on the -X side will also be referred to as "energy storage cell C1," and the energy storage cell 10 on the +X side will also be referred to as "energy storage cell C2." The electrode terminals 11 of the energy storage cells C1 and C2 are connected to the conductor member E2. 【0042】 As shown in the IV-IV end view (end view along the IV-IV line in the above plan view), the conductor member E1 has a housing section R1 and a through hole R2. The through hole R2 connects the surface (+Z side) of the conductor member E1 to the housing section R1. The housing section R1 extends outward from the through hole R2 (away from the center of the electrode terminals). In the XY plane, the through hole R2 is located inside the housing section R1. A receiving member 250 for receiving the tip of the electrode terminal of the energy storage cell 10 is arranged in the housing section R1. The conductor member E1 has a first layer E11 (first conductor layer) located to the side (X or Y direction) of the receiving member 250, and a second layer E12 (second conductor layer) connected to the +Z side end face of the first layer E11. The through hole R2 is formed in the second layer E12. The first layer E11 and the second layer E12 may be formed separately and joined together, or they may be formed seamlessly and integrally. Furthermore, through-holes R12 are formed in the insulating sheet 201b, which is located on the +Z side of the conductor member E1, at positions corresponding to each through-hole R2. The through-holes R2 (first through-hole) and R12 (second through-hole) may be formed to have the same shape and dimensions in the XY plane. In this embodiment, the wiring board 200 is manufactured so that the wiring pattern (including the conductor member E1) and the receiving member 250 shown in Figure 2 are arranged inside the substrate 201. 【0043】 Figure 5 is a diagram illustrating the manufacturing method of the wiring board 200. Referring to Figure 5, first, an insulating substrate 201a is prepared. Then, recesses R11 are formed in each region of the insulating substrate 201a corresponding to the wiring pattern. 【0044】 Next, in each recess R11, a receiving member 250 is provided at the location where the electrode terminals of the energy storage cell 10 are positioned. Each receiving member 250 may be fixed to the insulating substrate 201a with adhesive. 【0045】 Next, each conductor member (including conductor members E1 and E2) corresponding to the wiring pattern is placed in the corresponding recess R11. Each conductor member has the aforementioned housing portion R1 and through hole R2. The receiving member 250 is housed in the housing portion R1 of each conductor member. The through hole R2 is located on the +Z side of the receiving member 250. 【0046】 Next, insulating sheets 201b are provided on the insulating substrate 201a and the +Z side of each conductor member. The insulating sheets 201b may be made of resin (e.g., a resin film). This forms the substrate 201 with the insulating substrate 201a and insulating sheets 201b. The insulating substrate 201a and each conductor member are covered by the insulating sheets 201b. However, the insulating sheets 201b have through holes R12 at positions corresponding to each through hole R2. From above the substrate 201, the receiving members 250 placed inside the substrate 201 are visible through these through holes R2 and R12. Subsequently, a plurality of openings h2 are formed that penetrate the substrate 201. Each opening h2 is formed, for example, by punching, at a position facing the valve 13 of each energy storage cell 10. This completes the wiring board 200. 【0047】 The manufacturing method of the wiring board 200 is not limited to the above. For example, a first layer E11 may be formed in the recess R11, a receiving member 250 may be provided, a second layer E12 may be formed on the first layer E11 and the receiving member 250, and the first layer E11 and the second layer E12 may be joined together. 【0048】 Referring again to Figure 4, in this embodiment, each electrode terminal of the energy storage cell 10 is connected to the receiving member 250 through a through hole R2 of the corresponding conductor member, and is electrically connected to the conductor member outside the through hole R2 in the housing R1. Specifically, as shown in the partially enlarged view in Figure 4, each electrode terminal of the energy storage cell 10 (electrode terminal 12 is exemplified in Figure 4) has a first portion T11 from the body (case 10a) of the energy storage cell 10 to the through hole R2, a second portion T12 inside the through hole R2, and a third portion T13 from the through hole R2 to the receiving member 250. The third portion T13 is in contact with the surface of the receiving member 250 in the housing R1 and is plastically deformed outward on the surface of the receiving member 250. 【0049】 The right side of Figure 4 shows how the energy storage cell 10 is mounted. The receiving member 250 has a ring-shaped opening R3 in the XY plane. More specifically, the surface of the receiving member 250 includes a slope 251 that becomes lower towards the outside and a step 252 located outside the slope 251. The step 252 is formed by a bottom surface connected to the outer end of the slope 251 and a wall surface rising from the bottom surface on the +Z side. The opening R3 is demarcated by the slope 251 and the bottom and wall surfaces of the step 252. The opening R3 is connected to a through hole R2. In the XY plane, at least a portion of the slope 251 is located inside the through holes R2 and R12. The receiving member 250 is made of an insulating material (e.g., resin). However, it is not limited to this, and the receiving member 250 may be made of metal (e.g., aluminum). 【0050】 Before mounting the energy storage cell 10, each electrode terminal (electrode terminal 12 is shown as an example in Figure 4) has a disc-shaped base end T21 connected to the main body (surface F10) of the energy storage cell 10, and a cylindrical tip T22 protruding from the base end T21 toward the -Z side. During mounting the energy storage cell 10, the cylindrical tip T22 is inserted into the ring-shaped opening R3, and a force toward the -Z side is applied to the energy storage cell 10. Then, by pressing the tip T22 against the inclined surface 251 and causing plastic deformation, the structure shown in the IV-IV end view in Figure 4 is formed. The tip T22 pressed against the inclined surface 251 receives an outward force according to the shape of the inclined surface 251. Then, as the tip T22 plastically deforms outward and hits the step 252, the tip T22 plastically deforms toward the +Z side (second layer E12 side). As a result, a ring-shaped third portion T13 is formed in the ring-shaped opening R3. In this embodiment, the third portion T13 is in contact with the back surface (-Z side) of the second layer E12. The surface F10 of the energy storage cell 10 is in contact with the insulating sheet 201b. 【0051】 As described above, with the configuration shown in Figure 4, by applying the tips of each electrode terminal of the energy storage cell 10 to the receiving member 250 and causing plastic deformation, each electrode terminal of the energy storage cell 10 can be electrically connected to the wiring pattern (any of the conductor members of the wiring board 200). This makes it easier to mount the energy storage cell 10 on the wiring board 200 (for example, connecting the electrode terminals to the busbars). Furthermore, it makes it easier to connect the energy storage cell 10 to the conductor members and to maintain these connections. 【0052】 Figure 6 shows a modified example of the configuration shown in Figure 4. Referring to Figure 6, a receiving member 250A is positioned in the receiving portion R1A formed in the conductor member E1A according to the modified example. The conductor member E1A has a first layer E11A (first conductor layer) located to the side of the receiving member 250A, and a second layer E12A (second conductor layer) connected to the +Z side end face of the first layer E11A. Through holes R2A and R2B are formed in the second layer E12A. Specifically, the insulating sheet 201b has a through hole R12A. The second layer E12A is curved toward the +Z side (insulating sheet 201b side) so that the portion of the second layer E12A in which the through holes R2A and R2B are formed is positioned within the through hole R12A. Each of the through holes R2A and R2B is formed in an arc shape in the XY plane, as shown in the second plan view in Figure 6. Each of the through holes R2A and R2B connects to the housing R1A from the surface (+Z side) of the conductor member E1A. The housing R1A extends outward from each of the through holes R2A and R2B. 【0053】 Each electrode terminal of the energy storage cell 10 (electrode terminal 12 is shown as an example in Figure 6) has a first tip portion connected to the receiving member 250A through a through hole R2A, and a second tip portion connected to the receiving member 250A through a through hole R2B. Of these, the second tip portion has a first portion T11A from the body of the energy storage cell 10 to the through hole R2B, a second portion T12A inside the through hole R2B, and a third portion T13A from the through hole R2B to the receiving member 250A, as shown in the first enlarged view in Figure 6. The third portion T13A contacts the surface of the receiving member 250A in the housing portion R1A and undergoes plastic deformation inward (-X side) and outward (+X side) on the surface of the receiving member 250A. The first tip portion has a similar structure to the second tip portion. However, in the first tip portion, the +X side corresponds to the inside and the -X side corresponds to the outside. 【0054】 As shown in the second enlarged section of Figure 6, the surface of the receiving member 250A includes a slope 251A that becomes lower towards the outside and a step 252A located outside the slope 251A. The second enlarged section shows only the form of the receiving member 250A on the side of the through hole R2A. However, the receiving member 250A has a plane-symmetric form with respect to the YZ plane. Each of the through holes R2A and R2B is located above the slope 251A (on the +Z side). The receiving member 250A is formed of, for example, metal. However, the receiving member 250A may be formed of an insulating material. 【0055】 Before mounting the energy storage cell 10, each electrode terminal (electrode terminal 12 is shown as an example in Figure 6) has a disc-shaped base end T31 connected to the main body (surface F10) of the energy storage cell 10, and two tip ends T32A and T32B protruding from the base end T31 toward the -Z side. The tip ends T32A and T32B are shaped to be insertable into through holes R2A and R2B, respectively. The tip ends T32A and T32B may also be formed into curved plate shapes corresponding to the planar shapes of the through holes R2A and R2B, respectively. When mounting the energy storage cell 10, the tip ends T32A and T32B are inserted into the through holes R2A and R2B, respectively, and each of the tip ends T32A and T32B is pressed against the inclined surface 251A to cause plastic deformation. As a result, the tip sections T32A and T32B each undergo plastic deformation outward, colliding with the step 252A and deforming plastically toward the +Z side (the second layer E12A side). This causes the tip sections T32A and T32B to become the first tip section and the second tip section, respectively. 【0056】 As described above, the configuration shown in Figure 6 also facilitates the connection between the energy storage cell 10 and the conductive member, and the maintenance of these connections. The various features of the energy storage device described above (each feature described in the embodiments and modifications) may be applied in any combination. Furthermore, some components may be omitted as needed. For example, the insulating sheet 201b may be omitted. The application of the energy storage device is arbitrary. The energy storage device may be used in vehicles other than automobiles, mobile machinery (agricultural machinery, construction machinery, etc.), unmanned mobile bodies, robots, or buildings. 【0057】 The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than by the description of the embodiments above, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of Symbols] 【0058】 10 Energy storage cell, 11,12 Electrode terminals, 13 Valve, 100 Lower case, 110 Upper cover, 120 Shear panel, 200 Wiring board, 201a Insulating substrate, 201b Insulating sheet, 211~216 Conductor components, B Energy storage device.

Claims

[Claim 1] An energy storage device comprising an energy storage cell having electrode terminals and a conductive member, The conductor member has a housing portion and a first through-hole connecting the surface of the conductor member to the housing portion. The energy storage device further comprises a receiving member arranged in the housing section, An energy storage device in which the electrode terminal is connected to the receiving member through the first through hole and is electrically connected to the conductor member outside the first through hole in the housing portion. [Claim 2] The electrode terminals are, The first portion from the main body of the energy storage cell to the first through hole, The second portion within the first through hole, The third portion from the first through hole to the receiving member, It has, The energy storage device according to claim 1, wherein the third portion is in contact with the surface of the receiving member in the housing portion and is plastically deformed outward on the surface of the receiving member. [Claim 3] The energy storage device according to claim 2, wherein the surface of the receiving member has a slope that becomes lower towards the outside and a step located outside the slope. [Claim 4] The aforementioned energy storage device further comprises an upper cover, a lower case, a share panel, and a wiring board. The energy storage cell and the wiring board are housed between the lower case and the upper cover. The wiring board has a wiring pattern formed by a plurality of conductor members, including the conductor member. The energy storage cell has the electrode terminals and exhaust valve on a vertically downward-facing surface. The energy storage device according to any one of claims 1 to 3, wherein an exhaust passage is formed between the lower case and the share panel. [Claim 5] The aforementioned wiring board further comprises a first insulating layer and a second insulating layer, The first insulating layer has a recess formed therein. The conductor member and the receiving member are arranged in the recess. The conductor member includes a first conductor layer located to the side of the receiving member and a second conductor layer in which the first through hole is formed. The energy storage device according to claim 4, wherein the second insulating layer has a second through-hole at a position corresponding to the first through-hole and covers the first insulating layer and the second conductor layer.

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