Battery pack manufacturing method

Abstract

To prevent a power cable connected to a current breaker from being caught between fastening surfaces of a lower case and an upper case when the upper case is assembled to the lower case.SOLUTION: When an upper case is assembled to a lower case 2, a service plug 6 is brought into contact with the side surface of a connector 51 fixed to the lower case 2, and the reaction force due to the bending of a power cable PN1 is used to temporarily fix the service plug 6 to the connector 51.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to a method for manufacturing a battery pack. [Background technology]

[0002] In a battery pack including a battery stack (battery module / battery assembly) in which a plurality of single batteries (battery cells) such as nickel-metal hydride batteries or lithium-ion batteries are stacked, a current breaker (service plug) is provided to cut off the current during inspection and maintenance. For example, Japanese Patent Application Laid-Open Publication No. 2015-201363 (Patent Document 1) discloses a battery pack in which a current breaker and a battery monitoring unit are arranged side by side and adjacent to each other, and the connectors of the current breaker and the battery monitoring unit are positioned in an ingenious way, thereby improving the ease of assembly of the cable connecting the battery stack and the device and suppressing interference between the cables. In this battery pack, the reaction force against bending of the power cable connected to the current breaker is suppressed to improve the ease of assembly, and the voltage detection cable and the power cable are arranged at a distance from each other to suppress interference between the power cable and the voltage detection cable. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-201363 A Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, a battery pack is configured to house a battery stack in a battery case consisting of a lower case and an upper case (upper cover), and after the battery stack is installed (fixed) in the lower case, the upper case is assembled to the lower case. At this time, it is desirable to assemble the battery pack so that the power cable connected to the current breaker is not pinched between the fastening surfaces of the lower case and the upper case. Patent Document 1 discloses how to improve the ease of assembly by suppressing the reaction force against bending of the power cable connected to the current breaker, but does not disclose how to improve the ease of assembly by preventing the power cable from being pinched.

[0005] The present disclosure aims to provide a manufacturing method for a battery pack that can improve assembly by preventing a power cable connected to a current breaker from being pinched between the fastening surfaces of the lower case and upper case when assembling the upper case to the lower case. [Means for solving the problem]

[0006] The present disclosure relates to a method for manufacturing a battery pack in which a battery stack, in which unit cells are stacked, is housed in a battery case consisting of a lower case and an upper case. The battery pack includes a monitoring unit that detects the voltage of the unit cells or the battery stack, a connector that outputs a detection signal from the monitoring unit to the outside of the battery pack, and a current breaker provided on a power cable that connects an output terminal of the battery stack to a high-voltage connector. The method for manufacturing the battery pack includes a step of fixing the battery stack and the connector to the lower case, and a step of assembling the upper case to the lower case while fixing the position of the current breaker by abutting the current breaker against the connector.

[0007] According to this manufacturing method, in the process of assembling the upper case to the lower case, the current breaker is abutted against the connector fixed to the lower case, so that the upper case is assembled to the lower case while fixing the position of the current breaker. The current breaker is provided on the power cable, and when the current breaker is abutted against the connector, the current breaker is fixed at the position of the connector by a reaction force against the bending (flexion) of the power cable. This allows the position of the power cable on which the current breaker is provided (connected) to be fixed when assembling the upper case to the lower case, so that the power cable can be prevented from being pinched between the fastening surfaces of the lower case and upper case, and assembling can be performed with ease.

[0008] Preferably, the method further includes a step of fixing a current interrupter to a side surface of the upper case after assembling the upper case to the lower case, and when the direction perpendicular to the direction in which the single cells are stacked is the width direction of the battery case, the position at which the connector is fixed to the lower case may be located inside the width direction of the battery case from the side surface of the upper case to which the current interrupter is fixed.

[0009] According to this manufacturing method, the current breaker is fixed to the upper case after the upper case is assembled to the lower case. The position where the connector is fixed to the lower case is located inside the width direction of the battery case from the position (side surface) where the current breaker is fixed to the upper case. As a result, when the upper case is assembled to the lower case, the current breaker is fixed at a position inside the width direction of the battery case from the side surface where the current breaker is fixed to the upper case. Therefore, when the upper case is assembled to the lower case, it becomes relatively easy to fix the power cable on which the current breaker is provided (connected) to a position inside the width direction of the battery case, making it easier to prevent the power cable from being pinched between the fastening surfaces of the lower case and the upper case.

[0010] Preferably, in the stacking direction of the single cells, the monitoring unit, the connector, and the current breaker are arranged on one side of the battery stack, and the power cable is connected to an output terminal of the battery stack on the other side of the stacking direction, and the method further includes a step of fixing the current breaker to the upper case after assembling the upper case to the lower case, and when the direction perpendicular to the stacking direction is the width direction of the battery case, the position at which the connector is fixed to the lower case may be widthwise inward of the battery case from the side surface at which the current breaker is fixed to the upper case.

[0011] With this configuration, the monitoring unit, the connector, and the current breaker are arranged on one side of the battery stack in the stacking direction of the single cells, making inspection and maintenance easier than if they were arranged separately on both sides of the stacking direction of the battery stack. Since the power cable is connected to the output terminal arranged on the other side of the battery stack, the power cable extends in the stacking direction of the battery stack, and there is a high concern that the power cable connected to the current breaker will be pinched between the fastening surfaces of the lower case and the upper case when assembling the upper case to the lower case.

[0012] However, according to this manufacturing method, the position where the connector is fixed to the lower case is located on the inner side in the width direction of the battery case than the position (side surface) where the current breaker is fixed to the upper case, so when the upper case is assembled to the lower case, the current breaker is fixed at a position on the inner side in the width direction of the battery case than the position where the current breaker is fixed to the upper case. Therefore, when the upper case is assembled to the lower case, even if the power cable extends in the stacking direction, it is relatively easy to fix the power cable to a position on the inner side in the width direction of the battery case, and it is possible to prevent the power cable from being pinched between the fastening surfaces of the lower case and the upper case.

[0013] Preferably, the battery pack further includes a relay box incorporating a relay, a bracket for fixing the relay box to the lower case, and a high-voltage connector connected to the power cable, and in the stacking direction of the single cells, the current breaker, relay box, bracket, and high-voltage connector are arranged on one side of the battery stack, and in the process of assembling the upper case to the lower case, the high-voltage connector may be abutted against the bracket fixed to the lower case or the relay box, thereby fixing the position of the high-voltage connector, while assembling the upper case to the lower case.

[0014] According to this configuration, the battery pack includes a relay box incorporating a relay and a bracket for fixing the relay box to the lower case, and a high-voltage connector is connected to the power cable. According to this manufacturing method, in the step of assembling the upper case to the lower case, the high-voltage connector is abutted against the bracket or relay box fixed to the lower case, thereby fixing the position of the high-voltage connector while assembling the upper case to the lower case. Therefore, in the step of assembling the upper case to the lower case, the current breaker is fixed to the connector and the high-voltage connector is fixed to the bracket or relay box by a reaction force against the bending (flexure) of the power cable, so that the position of the power cable can be fixed and the power cable can be prevented from being pinched between the fastening surfaces of the lower case and upper case, improving ease of assembly.

[0015] Furthermore, by arranging the monitoring unit, connector, current breaker, relay box, bracket, and high-voltage connector on one side of the battery stack in the stacking direction of the single cells, inspection and maintenance are made easier than if they were distributed on both sides of the battery stack in the stacking direction. Effect of the Invention

[0016] According to the present disclosure, when assembling the upper case to the lower case, it is possible to prevent the power cable connected to the current breaker from being pinched between the fastening surfaces of the lower case and the upper case, thereby improving ease of assembly. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a perspective view of the battery pack 100 according to the present embodiment before assembly. [Diagram 2] FIG. 2 is a plan view of the battery stack 4. [Diagram 3] FIG. 2 is an enlarged view of the part surrounded by the dashed line in FIG. [Figure 4] 2 is a perspective view showing a part of the battery pack 100 before the upper case 3 is assembled. FIG. [Diagram 5] FIG. 2 is a plan view showing a part of the battery pack 100 before the upper case 3 is assembled. [Figure 6] 4 is a diagram showing the positions of the service plug 6 and the negative high voltage connector 7 when the upper case 3 is assembled to the lower case 2. FIG. [Figure 7] 2 is a perspective view of the battery pack 100 after the upper case 3 is assembled to the lower case 2. FIG. [Figure 8] 13 is a diagram showing the service plug 6 fixed to the upper case 3. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and the description thereof will not be repeated.

[0019] 1 is a perspective view of a battery pack 100 according to the present embodiment before assembly. The battery case 1 is composed of a lower case 2 and an upper case (upper cover) 3. The battery stack 4 is an assembled battery in which a plurality of unit cells (battery cells) 41 are stacked. The unit cells 41 are sealed rectangular secondary batteries, such as lithium ion batteries.

[0020] FIG. 2 is a plan view of the battery stack 4. FIG. 2 also illustrates the layout of a monitoring unit 5, a connector 51, a service plug 6, a negative high-voltage connector 7, a positive high-voltage connector 8, a relay box 9, a power cable PL1, a power cable PN1, and a power cable PN2, which will be described later. With reference to FIG. 1 and FIG. 2, a plurality of single cells 41 are stacked between a pair of end plates 42a, 42b, and are restrained by restraining members 43, 43 so as to suppress an increase in the distance between the end plates 42a, 42b. The battery stack 4 is formed by connecting the single cells 41 in series, and the positive and negative external terminals of the single cells 41 adjacent to each other in the stacking direction are electrically connected by a bus bar.

[0021] A monitoring unit 5 is provided on one end plate 42a via a bracket or the like. The monitoring unit 5 detects the voltage of the battery stack 4 or the single cells 41, and outputs a detection signal to a control device (not shown) that controls charging and discharging of the battery pack 100. The connector 51 is connected to the monitoring unit 5 via a voltage detection cable 52. By connecting the connector 51 to a connector on the control device side, a voltage signal detected by the monitoring unit 5 is output to the control device outside the battery pack 100.

[0022] The service plug 6 as a current breaker is provided between the power cable (wire harness) PN1 and the power cable (wire harness) PN2. The power cable PN1 is connected to the negative output terminal (negative general terminal) of the battery stack 4. As shown in FIG. 2, the negative output terminal of the battery stack 4 is located on the opposite side (the other side) from the position where the monitoring unit 5 is provided in the stacking direction. FIG. 3 is an enlarged view of the part surrounded by the dashed line in FIG. 1. As shown in FIG. 3, the power cable PN2 is connected to the negative high voltage connector 7 described later. The service plug 6 breaks the current path between the power cable PN1 and the power cable PN2, and is composed of a plug body and a grip that is inserted into the plug body. When the grip is inserted into the plug body, a current flows through the service plug 6, and the negative output terminal of the battery stack 4 and the negative high voltage connector 7 are connected by the power cable PN1 and the power cable PN2. When the grip is pulled out (removed) from the plug body, the current paths of the power cables PN1 and PN2 are physically disconnected (interrupted).

[0023] Referring to Figures 2 and 3, the positive output terminal (positive general terminal) of the battery stack 4 is located on the side (one side) where the monitoring unit 5 is placed, and a positive high-voltage connector 8 is connected to a power cable PL1 connected to the positive output terminal.

[0024] In FIG. 1 , relay box 9 incorporates a system main relay that establishes / breaks electrical connection with a load (e.g., a PCU (Power Control Unit) that drives an electric motor) connected to battery stack 4 (battery pack 100) via negative high-voltage connector 7 and positive high-voltage connector 8. For example, after upper case 3 is assembled to lower case 2, when negative high-voltage connector 7 and positive high-voltage connector 8 are connected to the connector portion of relay box 9, a current path through power cables PN2 and PL1 is connected to the system main relay. Then, a current path is connected between the system main relay and output terminals (terminals for connection with the PCU) of negative high-voltage connector 7 and positive high-voltage connector 8. Relay box 9 is fixed to the lower case by using bracket 10.

[0025] <Fixing the battery stack 4 and connector 51> FIG. 4 is a perspective view showing a part of the battery pack 100 before the upper case 3 is assembled. FIG. 5 is a plan view showing a part of the battery pack 100 before the upper case 3 is assembled. As shown in FIGS. 4 and 5, before the upper case 3 is assembled to the lower case 2, the battery stack 4 is fixed to the lower case 2 using fastening members (not shown). The fastening members may be bolts and nuts. The relay box 9 is fixed to the lower case 2 via a bracket 10. The connector 51 is fixed to the flange portion of the lower case 2 using bolts 54. The connector 51 may be fixed to the lower case 2 using clips instead of the bolts 54.

[0026] Temporarily fixing the service plug 6 and the negative high voltage connector 7 6 is a diagram showing the positions of the service plug 6 and the negative high-voltage connector 7 when the upper case 3 is assembled to the lower case 2. As shown in FIG. 6, the service plug 6 is brought into contact with the connector 51 fixed to the lower case 2, and the negative high-voltage connector 7 is brought into contact with the relay box 9. For example, the service plug 6 is brought into contact with a side surface of the connector 51. The negative high-voltage connector 7 is brought into contact with a protruding portion 91 of the relay box 9. This protruding portion 91 may be, for example, a connector that connects to a control device to control a system main relay. When the service plug 6 is brought into contact with the connector 51, a pressing force is applied to the contact portion due to a reaction force against the bending (flexure) of the power cables PN1 and PN2, and the service plug 6 is temporarily fixed at that position (the position of the connector 51). Similarly, when the negative high voltage connector 7 abuts against the protrusion 91, a pressing force is applied to the abutting portion due to the reaction force against the bending of the power cable PN2, and the negative high voltage connector 7 is temporarily fixed at that position. Note that in this disclosure, "temporary fixing" does not mean fixing with an adhesive or a fastening member, but uses the reaction force against the bending of the power cable PN1 or the power cable PN2, and "temporary fixing" may also be referred to as "temporary placement."

[0027] <Installation of upper case 3> As shown in Fig. 6, with the service plug 6 and the negative high-voltage connector 7 temporarily fixed (temporarily placed), the upper case 3 is assembled to the lower case 2. Fig. 7 is a perspective view of the battery pack 100 after the upper case 3 is assembled to the lower case 2. The upper case 3 is assembled to the lower case 2 from above the battery stack 4 so that the bolts 21 (e.g., welding bolts) (see Fig. 1) provided on the flange portion of the lower case 2 are inserted into the bolt holes 31 (see Fig. 1) provided on the flange portion of the upper case 3, and the upper case 3 is assembled to the lower case 2 by screwing nuts 33 onto the bolts 21.

[0028] Fig. 8 is a diagram showing the service plug 6 fixed to the upper case 3. After the upper case 3 is assembled to the lower case 2, the service plug 6 is fixed to the side surface 3s of the upper case 3 using bolts 61, as shown in Fig. 8.

[0029] When assembling the upper case 3 to the lower case 2, there is a concern that the power cable PN1 connected to the service plug 6 may be pinched between the fastening surfaces (flanges) of the upper case 3 and the lower case 2. According to this embodiment, in the process of assembling the upper case 3 to the lower case 2, the position of the service plug 6 is fixed (temporarily fixed) by abutting the service plug 6 against the connector 51 fixed to the lower case 2, and the upper case 3 is assembled to the lower case 2. The service plug 6 is provided on the power cables PN1 and PN2, and when the service plug 6 is abutted against the connector 51, the service plug 6 is fixed at the position of the connector 51 by a reaction force against the bending (flexure) of the power cables PN1 and PN2. As a result, when the upper case 3 is assembled to the lower case 2, the positions of the power cables PN1 and PN2 on which the service plug 6 is provided (connected) can also be fixed, thereby preventing the power cables PN1 and PN2 from being pinched between the fastening surfaces of the lower case 2 and the upper case 3, improving ease of assembly.

[0030] 5, the dashed dotted line indicates the position, in the width direction, of the side surface 3s of the upper case 3 to which the service plug 6 is fixed in the battery case 1 (battery pack 100). As shown in FIG. 5, the position at which the connector 51 is fixed to the lower case 2 is located inside the side surface 3s to which the service plug 6 is fixed to the upper case 3 in the width direction of the battery case 1. As a result, when the upper case 3 is assembled to the lower case 2, the service plug 6 is fixed at a position inside the side surface 3s to which the service plug 6 is fixed to the upper case 3 in the width direction of the battery case 1. Therefore, when the upper case 3 is assembled to the lower case 2, it is relatively easy to fix (position) the power cable PN1 to which the service plug 6 is connected at a position inside the width direction of the battery case 1, making it easier to prevent the power cable PN1 from being pinched between the fastening surfaces of the lower case 2 and the upper case 3.

[0031] In this embodiment, the monitoring unit 5, connector 51, service plug 6, relay box 9, negative high voltage connector 7, and positive high voltage connector 8 are arranged on one side of the stacking direction of the battery stack 4, and the power cable PN1 is connected to the output terminal of the battery stack 4 on the other side of the stacking direction. This makes inspection and maintenance easier than distributing the monitoring unit 5, relay box 9, etc. on both sides of the stacking direction of the battery stack 4. The power cable PN1 extends in the stacking direction of the battery stack 4 because it is connected to the output terminal on the other side of the stacking direction. However, the upper case 3 and the lower case 2 are assembled while the service plug 6 is temporarily fixed in contact with the connector 51, so that the power cable PN1 can be prevented from being pinched between the fastening surfaces of the lower case 2 and the upper case 3, improving the ease of assembly.

[0032] According to this embodiment, when assembling the upper case 3 to the lower case 2, the service plug 6 is abutted against the connector 51 fixed to the lower case 2 to fix (temporarily fix) the position of the service plug 6, and the negative high voltage connector 7 is abutted against the relay box 9 fixed to the lower case 2 to fix (temporarily fix) the position of the negative high voltage connector 7, and then the upper case 3 is assembled to the lower case 2. Therefore, in the process of assembling the upper case 3 to the lower case 2, the service plug 6 is fixed to the connector 51 and the negative high voltage connector 7 is fixed to the relay box 9 due to a reaction force against the bending (flexure) of the power cables PN1 and PN2, so that the position of the power cable PN2 can be fixed and it is possible to prevent the power cable PN2 from being pinched between the fastening surfaces of the lower case 2 and the upper case 3, thereby improving ease of assembly.

[0033] In this embodiment, when the upper case 3 is assembled to the lower case 2, the negative high-voltage connector 7 is abutted against the protrusion 91 of the relay box 9 fixed to the lower case 2. However, the position at which the negative high-voltage connector 7 is abutted is not limited to this. If the negative high-voltage connector 7 can be temporarily fixed (temporarily placed) using the reaction force of the bending (flexure) of the power cable PN2, for example, the negative high-voltage connector 7 may be abutted against the bracket 10, or may be sandwiched between the bracket 10 and the relay box 9.

[0034] 1 and 2, a duct 12 that introduces cooling air into the battery pack 100 is shown by a dashed line. Also, in Fig. 1, a rear cover 11 is shown by a dashed line, and the rear cover 11 is attached after the upper case 3 is attached to the lower case 2.

[0035] The following are examples of embodiments of the present disclosure. 1) A battery pack (100) that houses a battery stack (4) in which unit cells (41) are stacked in a battery case (1) consisting of a lower case (2) and an upper case (3), the battery pack (100) includes a monitoring unit (5) that detects the voltage of the unit cells (41) or the battery stack (4), a connector (51) that outputs a detection signal of the monitoring unit (5) to the outside of the battery pack (100), and a current breaker (6) provided on a power cable (PN1) that is connected to the battery stack (4), a monitoring unit (5), a connector (51), and a current breaker (6) arranged on one side of the battery stack (4), a power cable (PN1) connected to an output terminal of the battery stack (4) on the other side of the stacking direction, and when a direction perpendicular to the direction in which the single cells (41) are stacked is defined as a width direction of the battery case (1), a position at which the connector (51) is fixed to the lower case (2) is on the inner side in the width direction of the battery case (1) than a side surface (3s) of the upper case (3) to which the current breaker (6) is fixed.

[0036] According to this configuration, when the upper case (3) is assembled to the lower case (2), the service plug (2) is brought into contact with the connector (51) fixed to a position on the widthwise inner side of the battery case 1 than the side surface (3s) of the upper case (3) to which the service plug (6) is fixed, and the service plug (6) can be temporarily fixed by a reaction force caused by bending of the power cable (PN1). Since the position at which the connector (51) is fixed to the lower case (2) is on the widthwise inner side of the battery case (1) than the side surface (3s) of the upper case (3) to which the current breaker (6) is fixed, it becomes relatively easy to temporarily fix (position) the power cable (PN1) at a position on the widthwise inner side of the battery case (1) when the upper case (3) is assembled to the lower case (2), and it becomes easier to prevent the power cable (PN1) from being pinched between the fastening surfaces of the lower case (2) and the upper case (3).

[0037] 2)1 further includes a relay box (9) incorporating a relay, a bracket (10) for fixing the relay box (9) to the lower case (2), and a high-voltage connector (7) connected to a power cable (PN2), and in the stacking direction of the single cells (41), the current breaker (6), the relay box (9), the bracket (10), and the high-voltage connector (7) are arranged on one side of the battery stack (4).

[0038] According to this configuration, the monitoring unit (5), connector (51), current breaker (6), high-voltage connector (7), and relay box (9) are disposed on one side of the stacking direction of the battery stack (4), which makes inspection and maintenance easier than when these devices are disposed distributed on both sides of the stacking direction of the battery stack (4). Furthermore, when assembling the upper case (3) to the lower case (2), the service plug (2) can be abutted against the connector (51) fixed to a position on the inner side in the width direction of the battery case 1 from the side surface (3s) of the upper case (3) to which the service plug (6) is fixed, and the high-voltage connector (8) can be abutted against the relay box (9) or bracket (10), so that the service plug (6) and the high-voltage connector (8) can be temporarily fixed using the reaction force caused by bending the power cables (PN1) and (PN2). This makes it possible to prevent the power cable (PN1) from being pinched between the fastening surfaces of the lower case (2) and the upper case (3) when the upper case (3) is attached to the lower case (2).

[0039] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not by the description of the embodiments described above, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0040] 1 battery case, 2 lower case, 3 upper case, 3s side, 4 battery stack, 5 monitoring unit, 6 service plug, 7 negative high voltage connector, 8 positive high voltage connector, 9 relay box, 10 bracket, 11 rear cover, 12 duct, 21 bolt, 31 bolt hole, 33 nut, 41 battery, 42a end plate, 42b end plate, 43 restraining member, 51 connector, 52 voltage detection cable, 61 bolt, 91 protrusion, PN1 power cable, PN2 power cable, PL1 power cable.

Claims

1. A method for manufacturing a battery pack in which a battery stack having unit cells stacked thereon is housed in a battery case consisting of a lower case and an upper case, comprising: The battery pack includes: a monitoring unit for detecting a voltage of the battery cell or the battery stack; a connector for outputting a detection signal from the monitoring unit to the outside of the battery pack; a current breaker provided on a power cable connecting an output terminal of the battery stack and a high-voltage connector, fixing the battery stack and the connector to the lower case; and assembling the upper case to the lower case while fixing a position of the current breaker by abutting the current breaker against the connector, and after assembling the upper case to the lower case, fixing the current breaker to a side surface of the upper case, a side surface of the upper case to which the current breaker is fixed, the side surface of the upper case being fixed to the upper case, the side surface of the upper case being fixed to the upper case, and the side surface of the upper case being fixed to the upper case.

2. A method for manufacturing a battery pack in which a battery stack having unit cells stacked thereon is housed in a battery case consisting of a lower case and an upper case, comprising: The battery pack includes: a monitoring unit for detecting a voltage of the battery cell or the battery stack; a connector for outputting a detection signal from the monitoring unit to the outside of the battery pack; a current breaker provided on a power cable connecting an output terminal of the battery stack and a high-voltage connector, fixing the battery stack and the connector to the lower case; and assembling the upper case to the lower case while fixing a position of the current breaker by abutting the current breaker against the connector, the monitoring unit, the connector, and the current breaker are disposed on one side of the battery stack in a stacking direction of the single cells, and the power cable is connected to an output terminal of the battery stack on the other side of the stacking direction; and after assembling the upper case to the lower case, fixing the current breaker to a side surface of the upper case, A method for manufacturing a battery pack, wherein, when a direction perpendicular to the stacking direction is the width direction of the battery case, a position at which the connector is fixed to the lower case is widthwise inward of the battery case from the side of the upper case to which the current breaker is fixed.

3. A method for manufacturing a battery pack in which a battery stack having unit cells stacked thereon is housed in a battery case consisting of a lower case and an upper case, comprising: The battery pack includes: a monitoring unit for detecting a voltage of the battery cell or the battery stack; a connector for outputting a detection signal from the monitoring unit to the outside of the battery pack; a current breaker provided on a power cable connecting an output terminal of the battery stack and a high-voltage connector, fixing the battery stack and the connector to the lower case; and assembling the upper case to the lower case while fixing a position of the current breaker by abutting the current breaker against the connector, The battery pack includes: A relay box with a built-in relay; a bracket for fixing the relay box to the lower case; a high voltage connector connected to the power cable, the current breaker, the relay box, the bracket, and the high-voltage connector are disposed on one side of the battery stack in a stacking direction of the unit cells; A method for manufacturing a battery pack, in which, in a process of assembling the upper case to the lower case, the upper case is assembled to the lower case while fixing the position of the high-voltage connector by abutting the high-voltage connector to the bracket fixed to the lower case or the relay box.

4. A method for manufacturing a battery pack in which a battery stack having unit cells stacked thereon is housed in a battery case consisting of a lower case and an upper case, comprising: The battery pack includes: a monitoring unit for detecting a voltage of the battery cell or the battery stack; a connector for outputting a detection signal from the monitoring unit to the outside of the battery pack; a current breaker provided on a power cable connecting an output terminal of the battery stack and a high-voltage connector, fixing the battery stack and the connector to the lower case; and assembling the upper case to the lower case while fixing a position of the current breaker by abutting the current breaker against the connector, The battery pack includes: A relay box with a built-in relay; a bracket for fixing the relay box to the lower case; a high voltage connector connected to the power cable, the monitoring unit, the connector, the current breaker, the relay box, the bracket, and the high-voltage connector are disposed on one side of the battery stack in a stacking direction of the single cells, and the power cable is connected to the output terminal of the battery stack on the other side of the stacking direction; In a step of assembling the upper case to the lower case, the high-voltage connector is abutted against the bracket or the relay box fixed to the lower case, thereby fixing a position of the high-voltage connector, and the upper case is assembled to the lower case, and after assembling the upper case to the lower case, fixing the current breaker to a side surface of the upper case, A method for manufacturing a battery pack, wherein, when a direction perpendicular to the stacking direction is the width direction of the battery case, a position at which the connector is fixed to the lower case is widthwise inward of the battery case from the side of the upper case to which the current breaker is fixed.

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