Battery pack, sub-battery module, and method for manufacturing battery pack

Abstract

A battery pack includes a plurality of unit cells, a bus bar 302 electrically connecting terminals of the plurality of unit cells, a voltage detection line terminal 401 disposed so as to overlap the bus bar 302 and joined to the bus bar 302, and a bus bar holder 311 provided with a mounting area for the bus bar 302 and the voltage detection line terminal 401. The bus bar (302) and the voltage detection line terminal (401) respectively have recessed portions (321a, 321b) and recessed portions (421a, 421b) as displacement restricting portions disposed so as to overlap each other, and the bus bar holder (311) has protruding portions (331a, 331b) as displacement restriction receiving portions that engage with the displacement restricting portions and restrict displacement of the bus bar (302) and the voltage detection line terminal (401). As a result, it is possible to provide a battery pack, a sub-battery module, and a method for manufacturing a battery pack in which the voltage detection line terminal can be positioned with high accuracy with respect to the bus bar.

Description

Technical Field

[0001] This invention relates to a battery pack, a sub-battery module, and a method for manufacturing the battery pack. Background Technology

[0002] Previously, there was a known battery pack that electrically connected the terminals of multiple individual cells through a busbar and had voltage detection line terminals for measuring the voltage of individual cells.

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2018-81875 Summary of the Invention The problem the invention aims to solve However, accurately positioning the voltage detection line terminals relative to the busbar is not easy, which is a major reason for the increased manufacturing cost of the battery pack.

[0004] The purpose of this invention is to provide a battery pack, a sub-battery module, and a method for manufacturing the battery pack, which can accurately position the voltage detection line terminals relative to the busbar.

[0005] means for solving problems To address the aforementioned problems, the battery pack of the present invention comprises a plurality of individual cells. It includes a busbar that electrically connects the terminals of the plurality of individual cells. The battery pack of the present invention includes voltage detection line terminals that overlap with and engage with the busbar. The battery pack of the present invention includes a busbar support having mounting areas for the busbar and the voltage detection line terminals. The busbar and the voltage detection line terminals each have displacement limiting portions arranged in an overlapping manner. The busbar support has a displacement limiting receiving portion that engages with the displacement limiting portions to limit the displacement of the busbar and the voltage detection line terminals.

[0006] Furthermore, to address the aforementioned problems, the sub-battery module of the present invention includes a busbar for electrically connecting the terminals of multiple individual cells. The sub-battery module of the present invention includes a busbar support with a mounting area for the busbar. The sub-battery module of the present invention restricts the displacement of the busbar by engaging with a displacement limiting portion disposed on the busbar and a displacement limiting receiving portion disposed on the busbar support.

[0007] Furthermore, to address the aforementioned problems, the battery pack manufacturing method of the present invention includes a mounting step in which a busbar for electrically connecting the terminals of multiple individual cells and a voltage detection line terminal engaged with the busbar are overlapped and arranged in a predetermined mounting area of ​​a busbar support. The method also includes a joining step in which the busbar and the voltage detection line terminal are joined. In the mounting step, a displacement limiting portion is configured such that a displacement limiting portion engages with a displacement limiting receiving portion. The displacement limiting portion is formed on the busbar and the voltage detection line terminal and is arranged in an overlapping manner. The displacement limiting receiving portion is formed on the busbar support and limits the displacement of the busbar and the voltage detection line terminal.

[0008] Invention Effects According to the present invention, a battery pack, a sub-battery module, and a method for manufacturing the battery pack are provided, which can accurately position the voltage detection line terminals relative to the busbar. Attached Figure Description

[0009] Figure 1 A perspective view of the battery pack 1 according to an embodiment is shown.

[0010] Figure 2 This is a perspective view showing the constituent components of the battery 100 and the holding unit 200 in a state of decomposition in the stacking direction X.

[0011] Figure 3 This is a perspective view showing the structure of the busbar unit 300 and the voltage detection unit 400 of the first embodiment.

[0012] Figure 4 From Figure 3 The diagram shows the busbar unit 300 and voltage detection unit 400 when viewed from the IV direction.

[0013] Figure 5 From Figure 3 The diagram shows the busbar unit 300 and voltage detection unit 400 when viewed from the V direction.

[0014] Figure 6 for Figure 4 An enlarged view of the portion shown in VI.

[0015] Figure 7 This diagram illustrates the structure of the busbar 302 and the voltage detection line terminal 401.

[0016] Figure 8 for Figure 7 Sectional view of VIII-VIII.

[0017] Figure 9 (a) in the figure shows the displacement limiting part of the busbar 302b. Figure 9(b) is a diagram showing the displacement limiting part of the voltage detection line terminal 401. Figure 9 (c) is a graph showing the ratio (b / a) of the depth / protrusion length (b) to the width (a) of the recesses 321a, 321b, 421a, and 421b.

[0018] Figure 10 (a) in the text is from Figure 3 The diagram shows the state in which busbars 302a, 302b and voltage detection line terminal 401 are embedded in the busbar bracket 311, viewed from direction IV. Figure 10 (b) in the middle is from Figure 3 The diagram shows the state in which busbars 302a, 302b and voltage detection line terminal 401 are arranged on busbar bracket 311, viewed from the V direction.

[0019] Figure 11 Figures (a) to (b) in the second embodiment show the displacement limiting part and the displacement limiting receiving part.

[0020] Figure 12 From Figure 11 The diagram shows the voltage detection line terminal 401 viewed from the XII direction. Detailed Implementation

[0021] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0022] <Overall Description of Battery Pack 1> Reference Figures 1 to 2 The structure of the battery pack 1 according to the embodiments is explained. Embodiments for carrying out the present invention are described with reference to the accompanying drawings. To facilitate understanding of the various embodiments, the size and proportions of the constituent components are exaggerated in the various drawings. The same reference numerals are used for the same structures in the various drawings. Arrows indicate the stacking direction X, width direction Y, and height direction Z of the battery pack 1 in the various drawings. However, the stacking direction X, width direction Y, and height direction Z of the battery pack 1 in the various drawings represent relative positional relationships within the same drawing. That is, the stacking direction X, width direction Y, and height direction Z of the battery pack 1 will change when the battery pack 1 is rotated 180 degrees so that the upper and lower surfaces are reversed, and when the battery pack 1 is rotated 90 degrees so that the upper surface is positioned as a side. The threads on the outer peripheral surface of the fastening bolts and the grooves on the inner peripheral surface of the nut are omitted from the illustrations in the various drawings.

[0023] Reference Figures 1 to 2 The structure of the battery pack 1 in the embodiment is explained.

[0024] Figure 1 A perspective view of the battery pack 1 according to an embodiment is shown. Figure 2This is a perspective view showing the constituent components of the battery 100 and the holding unit 200 in a state of decomposition in the stacking direction X.

[0025] For example, battery pack 1 can be configured as a power source for operating a motor, which in turn propels the vehicle. Alternatively, battery pack 1 can be configured as a power source for operating electrical equipment mounted on the vehicle.

[0026] like Figure 1 As shown, the battery pack 1 includes a plurality of batteries 100, a holding unit 200 for holding the plurality of batteries 100, and a busbar unit 300 for electrically connecting the plurality of batteries 100. Alternatively, the battery pack 1 includes a voltage detection unit 400 for detecting the voltage of the batteries 100 and a temperature measurement unit (not shown) for measuring the temperature of the batteries 100.

[0027] (Structure of battery 100) Battery 100 is an example of a single cell, stacked along the stacking direction X via holding unit 200. For example, 24 batteries 100 may be stacked. For example, battery 100 may be composed of a lithium-ion secondary battery. Battery 100 includes a current collector and an electrolyte. Figure 2 As shown, the battery 100 includes a container 101, a cover 102, a positive terminal 103, a negative terminal 104, and a safety valve 105. The structure of the battery 100 will be described below.

[0028] like Figure 2 As shown, the battery 100 is formed in a cuboid shape. A positive terminal 103 and a negative terminal 104 are provided on the upper surface 100a of the battery 100 along the stacking direction X. Figure 2 In this context, the upper surface 100a corresponds to the upper surface of the battery 100. The upper surface 100a is rectangular. The length of the upper surface 100a along the width direction Y of the battery 100 is longer than the length of the upper surface 100a along the stacking direction X of the battery 100. The upper surface 100a and... Figure 1 The busbar units 300 shown face each other. The two side surfaces 100b of the battery 100 along the stacking direction X are orthogonal to and face the upper surface 100a. The side surfaces 100b are rectangular. The length of the side surfaces 100b along the height direction Z of the battery 100 is longer than its length along the stacking direction X of the battery 100. The two main surfaces 100c of the battery 100 facing each other in the stacking direction X are in contact with the unit spacers 202 of the holding unit 200, etc.

[0029] The current collector of battery 100 acts as a charging and discharging element for inputting and outputting power. The current collector of battery 100 is formed by winding or stacking positive and negative electrodes via a separator. The current collector and electrolyte are contained in container 101. A cover 102 seals the current collector and electrolyte together with container 101. The cover 102 is engaged with container 101. Positive terminal 103 and negative terminal 104 relay the input and output of power between the current collector and electrical equipment. Positive terminal 103 and negative terminal 104 are mounted on cover 102. Figure 2 As shown, the positive terminal 103 of one battery 100 and the negative terminal 104 of another battery 100 face each other along the stacking direction X. If the internal pressure of a battery 100 exceeds a specified value, the safety valve 105 cracks outwards from the battery 100. The safety valve 105 is also called a crack valve. For example, the safety valve 105 is provided in the cover 102.

[0030] (Maintain the structure of unit 200) The holding unit 200 holds multiple batteries 100. For example... Figure 2 As shown, the retaining unit 200 includes a first end spacer 201, a unit spacer 202, and a second end spacer 203. Alternatively, the retaining unit 200 includes a first end block 211, a second end block 212, an insulating member 221, and an embedded nut 222. Or, as... Figure 1 As shown, the retaining unit 200 includes a first side plate 231, a second side plate 232, and a fastening bolt 241.

[0031] The following describes the structure included in retaining unit 200.

[0032] like Figure 2 As shown, a first end spacer 201 is disposed between the first end block 211 and the battery 100. The first end spacer 201 contacts the first battery 100 located at one end of the stacked 24 batteries 100. The first end spacer 201 insulates the first end block 211 from the battery 100. The first end spacer 201 covers the respective side surfaces of the first end block 211 and the battery 100 along the width direction Y. The first end spacer 201 covers a portion of the side surface 100b of the battery 100 along the stacking direction X. The thickness of the first end spacer 201 along the stacking direction X is sufficiently thin compared to the thickness of the battery 100 along the stacking direction X. The first end spacer 201 is formed of an insulating material.

[0033] like Figure 2As shown, a cell spacer 202 is disposed between adjacent cells 100. The cell spacer 202 holds adjacent cells 100 together and insulates them. The cell spacer 202 covers a portion of the main surface 100c of each adjacent cell 100 along the width direction Y and a portion of the side surface 100b of each adjacent cell 100 along the stacking direction X. The thickness of the cell spacer 202 along the stacking direction X is sufficiently thin compared to the thickness of the cell 100 along the stacking direction X. The cell spacer 202 is formed of an insulating material.

[0034] like Figure 2 As shown, a second end spacer 203 is disposed between the battery 100 and the second end block 212. The second end spacer 203 contacts the 24th battery 100 located on the other end side of the stacked 24 batteries 100. The second end spacer 203 insulates the battery 100 from the second end block 212. The second end spacer 203 covers the side surfaces of the first end block 211 and the battery 100 respectively along the width direction Y. The second end spacer 203 covers a portion of the side surface 100b of the battery 100 along the stacking direction X. The thickness of the second end spacer 203 along the stacking direction X is sufficiently thin compared to the thickness of the battery 100 along the stacking direction X. The second end spacer 203 is formed of an insulating material.

[0035] like Figure 2 As shown, the first end block 211 is stacked with the first battery 100 located at one end of the stacked 24 batteries 100, separated by a first end spacer 201. The first end block 211 extends along a width direction Y intersecting the stacking direction X of the batteries 100. The first end block 211 is adjacent to and supports the battery 100 located at its end position along the stacking direction X. The first end block 211 is formed into a cuboid shape extending in the width direction Y. Fastening bolts 241 are threadedly fixed in a plurality of threaded holes 211m formed on the side of the first end block 211 along the width direction Y. Figure 1 As shown, the first end block 211 is fixed to the first side plate 231 by fastening bolts 241. Similarly, the first end block 211 is fixed to the second side plate 232 by fastening bolts 241. An insertion hole 211n is formed in the first end block 211 for inserting bolts or the like that securing the battery pack 1. For example, the first end block 211 is made of metal or resin.

[0036] like Figure 2As shown, the second end block 212 is stacked with the 24th battery 100 located on the other end side of the stacked 24 batteries 100, separated by the second end spacer 203. The second end block 212 extends along the width direction Y of the battery 100. The second end block 212 is adjacent to and supports the battery 100 located at the end position along the stacking direction X. The second end block 212 is formed into a cuboid shape extending in the width direction Y. Fastening bolts 241 are threadedly fixed in a plurality of threaded holes formed on the side of the second end block 212 along the width direction Y. Figure 1 As shown, the second end block 212 is fixed to the first side plate 231 by fastening bolts 241. Similarly, the second end block 212 is fixed to the second side plate 232 by fastening bolts 241. An insertion hole 212n is formed in the second end block 212 for inserting bolts or the like that used to fix the battery pack 1. For example, the second end block 212 is made of metal or resin.

[0037] like Figure 2 As shown, the insulating member 221 is inserted into the first end block 211. Alternatively, the insulating member 221 is inserted into the second end block 212. For example, the insulating member 221 is formed in a cuboid shape. The insulating member 221 is formed of an insulating material.

[0038] The insulating member 221 can have the following structure: It can be integrally formed with the first end spacer 201 or separately formed with and joined to the first end spacer 201. In this case, a recess is provided on the surface of the first end block 211 facing the first end spacer 201 to accommodate the insulating member 221 along the lamination direction X. Similarly, the insulating member 221 can be integrally formed with the second end spacer 203 or separately formed with and joined to the second end spacer 203. In this case, a recess is provided on the surface of the second end block 212 facing the second end spacer 203 to accommodate the insulating member 221 along the lamination direction X.

[0039] The embedded nut 222 is embedded in a recess formed on the upper surface of the insulating member 221. For example, the embedded nut 222 is secured with a fastening bolt via a busbar that communicates with external control equipment.

[0040] like Figure 1 As shown, a first side plate 231 is disposed at one end of the plurality of batteries 100 along the stacking direction X of the stacked plurality of batteries 100 in the width direction Y. The first side plate 231 holds the plurality of batteries 100 along the stacking direction X. The first side plate 231 is fixed to a first end block 211 and a second end block 212 by fastening bolts 241.

[0041] like Figure 1As shown, the second side plate 232 is disposed at the other end of the plurality of batteries 100 along the stacking direction X of the stacked plurality of batteries 100 in the width direction Y. The second side plate 232 holds the plurality of batteries 100 along the stacking direction X. The second side plate 232 is fixed to the first end block 211 and the second end block 212 by fastening bolts 241.

[0042] (Structure of busbar unit 300 and voltage detection unit 400) [First Implementation] The structure of the busbar unit 300 and the voltage detection unit 400 will be described below through the first embodiment to the second embodiment.

[0043] Figures 3-6 This diagram illustrates the structure of the busbar unit 300 and the voltage detection unit 400 according to the first embodiment.

[0044] in, Figure 3 This is a perspective view showing the structure of the busbar unit 300 and the voltage detection unit 400 of the first embodiment.

[0045] Figure 4 From Figure 3 The image shows the busbar unit 300 and voltage detection unit 400 viewed from direction IV. Additionally, Figure 4 This can also be described as a diagram showing the busbar unit 300 and the voltage detection unit 400 viewed from the opposite direction in the Z-direction. Furthermore, Figure 4 It can also be described as a view showing the front of the busbar unit 300.

[0046] Figure 5 From Figure 3 The diagram shows the busbar unit 300 and the voltage detection unit 400 viewed from the V direction. Additionally, Figure 5 This can also be described as a diagram showing the busbar unit 300 and the voltage detection unit 400 viewed from the Z-direction. Furthermore, Figure 5 It can also be described as a diagram showing the back of the busbar unit 300.

[0047] Figure 6 for Figure 4 An enlarged view of the portion shown in VI.

[0048] like Figures 3-6 As shown, the busbar unit 300 has a first-end busbar 301, multiple busbars 302, a second-end busbar 303, and a busbar support 311. Figures 3-4 As shown, the voltage detection unit 400 has a harness 450. The harness 450 is an assembly that connects the voltage detection line terminal 401, the voltage detection line 402, the connector 403, and the temperature measuring unit together.

[0049] The first terminal busbar 301 and the negative terminal 104 of the battery 100 closest to the first terminal block 211 among the stacked 24 batteries 100 (see reference). Figure 2 ) join.

[0050] Busbar 302 electrically connects the terminals of multiple batteries 100. Thus, as... Figure 3 As shown, busbar 302 electrically connects one adjacent battery 100 to another battery 100 along the stacking direction X. Busbar 302 connects the positive terminal 103 of one adjacent battery 100 along the stacking direction X to the negative terminal 104 of the other adjacent battery 100 along the stacking direction X (see reference). Figure 2 ) join.

[0051] The second terminal busbar 303 engages with the positive terminal 103 of the battery 100 closest to the second terminal block 212 among the 24 stacked batteries 100.

[0052] Busbar bracket 311 houses a busbar 302 and a voltage detection line terminal 401. The busbar bracket 311 has a mounting area for the busbar 302 and the voltage detection line terminal 401. Furthermore, the busbar 302 and the voltage detection line terminal 401 are overlapped and embedded in this mounting area. For example, the busbar bracket 311 is a resin molded part.

[0053] The voltage detection line terminal 401 is overlapped with and engaged with the busbar 302. Thus, the voltage detection line terminal 401 detects the voltage of the battery 100.

[0054] The voltage detection line 402 is connected to the voltage detection line terminal 401, and the voltage information detected by the voltage detection line terminal 401 is sent to the external control device via the connector 403.

[0055] The first-end busbar 301, busbar 302, the second-end busbar 303, and the voltage detection line terminal 401 are formed, for example, by a cladding material that joins copper and aluminum, or by copper or aluminum.

[0056] (Structure of busbar 302 and voltage detection line terminal 401) Figure 7 This diagram illustrates the structure of the busbar 302 and the voltage detection line terminal 401. Additionally, Figure 8 for Figure 7 Sectional view VIII-VIII. Furthermore... Figure 7 In order to facilitate understanding, the busbar support 311 and busbar 302 are shown in a semi-transparent manner.

[0057] Busbar 302 consists of a pair of busbars 302a and 302b. Busbars 302a and 302b connect the terminals of battery 100. In this case, as... Figure 8 As shown, for example, busbar 302b is connected to the negative terminal 104 as a terminal. In this case, busbar 302a is connected to the positive terminal 103 as a terminal. Busbars 302a and 302b are composed of three surfaces: a bottom M1, a side M2, and a top M3. The bottom M1 is located along the XY plane, the side M2 ​​bends from the bottom M1 in the Z direction and is located along the YZ plane, and the top M3 bends from the side M2 ​​in the X direction and is located along the XY plane. Furthermore, the top M3 of each of the busbars 302a and 302b overlaps and is electrically connected.

[0058] The voltage detection line terminal 401 is respectively joined to the first end busbar 301, multiple busbars 302, and the second end busbar 303 of the busbar unit 300. For example, they are joined by laser welding. Figure 8 As shown, the voltage detection line terminal 401 is connected to the side of the bottom M1 of the busbar 302b facing in the opposite direction to the Z direction. Figure 7 As shown, the voltage detection line 402 connected to the voltage detection line terminal 401 is configured to move in the opposite direction from the voltage detection line terminal 401 toward the Y direction.

[0059] In addition, the busbar 302b and the voltage detection line terminal 401 have displacement limiting parts for configuration with higher precision.

[0060] Figure 9 (a) in the figure shows the displacement limiting part of the busbar 302b. Figure 9 (a) shows the direction Figure 7 Observe the busbar 302b in the opposite direction of the Z direction.

[0061] Figure 9 (b) is a diagram showing the displacement limiting part of the voltage detection line terminal 401. Figure 9 (b) shows the direction Figure 7 Observe the voltage detection line terminal 401 from the opposite direction of the Z direction.

[0062] like Figure 9 As shown in (a), the busbar 302b has recesses 321a and 321b that serve as displacement limiting parts.

[0063] like Figure 9 As shown in (b), the voltage detection line terminal 401 has recesses 421a and 421b that serve as displacement limiting parts.

[0064] When these displacement limiting portions are provided on the busbar bracket 311, they are arranged in such a way that the displacement limiting portions of the busbar 302 and the voltage detection line terminal 401 overlap each other. That is, when provided on the busbar bracket 311, recesses 321a and 421a are located at the same position and overlap each other. In addition, recesses 321b and 421b are located at the same position and overlap each other.

[0065] In addition, such as Figure 9 As shown in (c), the ratio (b / a) of the depth (b) to the width (a) of the recesses 321a, 321b, 421a, and 421b is preferably 1 / 5 or more and 4 or less. In this case, the busbar 302 and the voltage detection line terminal 401 can be configured with higher precision, and the workability during assembly is improved.

[0066] Furthermore, the displacement limiting portion can be either a recess or a convex portion. Therefore, the displacement limiting portion can also be described as a pair of recesses or a pair of convex portions provided on the edges of the busbar 302 and the voltage detection line terminal 401.

[0067] Figure 10 (a) is a diagram showing the state in which busbars 302a, 302b and voltage detection line terminal 401 are embedded in busbar bracket 311. Figure 10 (a) in the middle shows from Figure 3 Observe the busbar bracket 311, busbars 302a and 302b, and voltage detection line terminal 401 from direction IV.

[0068] Figure 10 (b) is a diagram showing the state in which the voltage detection line terminal 401 is positioned on the busbar bracket 311. Figure 10 (b) shows from Figure 3 Observe the busbar bracket 311 and voltage detection line terminal 401 in the V direction. Furthermore, in Figure 10 In (b) of the diagram, the busbar support 311 is described in a semi-transparent manner for ease of understanding.

[0069] The busbar bracket 311 has a displacement limiting receiving part that engages with the displacement limiting part to limit the displacement of the busbar 302 and the voltage detection line terminal 401.

[0070] exist Figure 10 In (a) to (b), the displacement limiting receiving portion is a convex portion 331a, 331b. That is, the concave portions 321a, 421a, which are displacement limiting portions, engage with the convex portion 331a, which is a displacement limiting receiving portion. On the other hand, the concave portions 321b, 421b, which are displacement limiting portions, engage with the convex portion 331b, which is a displacement limiting receiving portion. Furthermore, when the displacement limiting portion is a convex portion, the displacement limiting receiving portion is a concave portion.

[0071] This allows the busbar 302b and voltage detection line terminal 401 to be configured on the busbar bracket 311 with higher precision.

[0072] In addition, such as Figure 10 As shown in (b), a joining portion 340 is provided between the recesses 421a and 421b, which serve as displacement limiting portions, to join the busbar 302b to the voltage detection line terminal 401. The joining portion 340 is located at the position where the busbar 302b and the voltage detection line terminal 401 overlap. As described above, for example, the joining is performed by laser welding; therefore, in this case, the joining portion 340 is a laser welding mark. Alternatively, in this case, it can be said that the joining portion 340 is provided between the recesses 321a and 321b, which serve as displacement limiting portions. Furthermore, in this case, it can also be said that the joining portion 340 is provided between the protrusions 331a and 331b, which serve as displacement limiting receiving portions. In this case, joining with higher precision is possible.

[0073] (Structure of the temperature measuring unit) The temperature measuring unit measures the temperature of the battery 100 under the control of, for example, an external control device. The temperature measuring unit includes a temperature sensor and wires.

[0074] (Effect of battery pack 1 in the first embodiment) The effects of the battery pack 1 in the first embodiment will be explained.

[0075] A battery pack 1 is provided that allows for highly accurate positioning of the voltage detection line terminal 401 relative to the busbar 302. Conventionally, after the voltage detection line terminal 401 is configured, a load is applied to the wiring harness 450 during assembly operations, causing deformation of the engagement portion 340 of the voltage detection line terminal 401 and making it impossible to maintain contact pressure. On the other hand, by implementing a structure that facilitates the positioning of the busbar 302 and the voltage detection line terminal 401, it is less likely to generate loads during assembly, and the engagement portion 340 of the voltage detection line terminal 401 is less prone to deformation. Furthermore, the manufacturing cost of the battery pack 1 is reduced.

[0076] It makes it easier to set up displacement limiting parts.

[0077] It enables higher precision bonding.

[0078] Improve the workability of the joint.

[0079] It enables more precise configuration of the busbar 302 and voltage detection line terminal 401, and improves workability during assembly.

[0080] [Second Implementation] In the first embodiment described above, either the displacement limiting part or the displacement limiting receiving part is a concave portion, and the other is a convex portion. By engaging them, the busbar 302 and the voltage detection line terminal 401 are positioned. However, the configuration of the displacement limiting part and the displacement limiting receiving part is not limited to this. In the second embodiment, another example of the displacement limiting part and the displacement limiting receiving part will be described.

[0081] Figure 11 Figures (a) to (b) in the second embodiment show the displacement limiting part and the displacement limiting receiving part.

[0082] in, Figure 11 (a) is a perspective view showing the structure of the busbars 302a and 302b and the voltage detection line terminal 401 in the second embodiment. Additionally, Figure 11 (b) in the middle is from Figure 11 The diagram shows the busbars 302a and 302b and the voltage detection line terminal 401 viewed from the XIb direction in (a).

[0083] In this case, the displacement limiting portion is a hole 321c formed in the busbar 302b and a recess 421c formed in the voltage detection line terminal 401. On the other hand, the displacement limiting receiving portion is a pin-shaped protrusion 360 formed in the busbar support 311.

[0084] In the second embodiment, the displacement limiting part is a hole or recess provided in the busbar 302b and the voltage detection line terminal 401, and the displacement limiting receiving part is a protrusion 360 provided in the busbar bracket 311. Moreover, by the protrusion 360 penetrating through the hole or recess and engaging with the hole or recess, the displacement of the busbar 302b and the voltage detection line terminal 401 is limited.

[0085] Figure 12 From Figure 11 The diagram shows the voltage detection line terminal 401 viewed from the XII direction.

[0086] As shown in the figure, the recess 421c engages with the protrusion 360. Furthermore, a junction 340 is provided to connect the busbar 302b and the voltage detection line terminal 401, surrounding the recess 421c. Additionally, in Figure 12 In order to facilitate understanding, the busbar support 311 is described in a semi-transparent manner.

[0087] In this case, the joint 340 is a U-shaped weld mark. However, it is not limited to this; for example, it can also be a "ko" shape.

[0088] (Effect of battery pack 1 in the second embodiment) The effects of the battery pack 1 in the second embodiment will be explained.

[0089] A battery pack 1 is provided that is capable of positioning the voltage detection line terminal 401 relative to the busbar 302 with high precision.

[0090] It can maintain the electrical connection between the busbar 302 and the voltage detection line terminal 401.

[0091] (Sub-battery module) In the above example, battery pack 1 is described, and busbar unit 300 can also be regarded as an invention of sub-battery module.

[0092] As a sub-battery module, the following approaches are conceivable.

[0093] (1) The busbar 302 is provided on the busbar bracket 311, but the voltage detection line terminal 401 is not provided. The user prepares to connect the voltage detection line terminal 401.

[0094] (2) A busbar 302 and a voltage detection line terminal 401 are provided on the busbar bracket 311. However, these are not connected.

[0095] (3) A busbar 302 and a voltage detection line terminal 401 are provided on the busbar bracket 311. Moreover, these are already connected.

[0096] Method (1) can be regarded as a sub-battery module having a busbar 302 for electrically connecting the terminals of multiple batteries 100 and a busbar bracket 311 having a mounting area for the busbar 302. The displacement of the busbar 302 is restricted by engaging the displacement limiting part provided on each busbar 302 with the displacement limiting receiving part provided on the busbar bracket 311.

[0097] Method (2) can be regarded as a sub-battery module as follows: based on method (1), a voltage detection line terminal 401 is also provided in the mounting area, which overlaps with the busbar 302. The voltage detection line terminal 401 has a displacement limiting part. When the voltage detection line terminal 401 overlaps with the busbar 302, the displacement limiting part of the voltage detection line terminal 401 is positioned at the same position as the displacement limiting part of the busbar 302. The displacement limiting receiving part of the busbar bracket 311 engages with the displacement limiting parts of both the busbar 302 and the voltage detection line terminal 401 to limit the displacement of the busbar 302 and the voltage detection line terminal 401.

[0098] Method (3) can be regarded as a sub-battery module, which, based on method (2), is provided with a joint 340 that connects the busbar 302 to the voltage detection line terminal 401.

[0099] (Effect of the sub-battery module) A sub-battery module capable of positioning the busbar 302 with high precision is provided.

[0100] A sub-battery module is provided that can accurately position the voltage detection line terminal 401 relative to the busbar 302.

[0101] After the busbar 302 and the voltage detection line terminal 401 are positioned with high precision, the busbar 302 and the voltage detection line terminal 401 can be connected in this state.

[0102] (Manufacturing method of battery pack 1) The above method can also be regarded as an invention of the manufacturing method of battery pack 1.

[0103] In this case, the manufacturing method of battery pack 1 includes the following two steps.

[0104] (A) A placement process in which a busbar 302 for electrically connecting the terminals of a plurality of batteries 100 and a voltage detection line terminal 401 to be coupled to the busbar 302 are overlapped in a predetermined placement area of ​​the busbar bracket 311.

[0105] (B) The joining process of connecting the busbar 302 to the voltage detection line terminal 401.

[0106] In the placement process of (A), the displacement limiting part formed on the busbar 302 and the voltage detection line terminal 401 and arranged in an overlapping manner is engaged with the displacement limiting receiving part formed on the busbar support 311 and which limits the displacement of the busbar 302 and the voltage detection line terminal 401.

[0107] In addition, in the joining process of (B), the busbar 302 is joined to the voltage detection line terminal 401 by means of laser welding or the like.

[0108] (Effect of the manufacturing method of battery pack 1) It enables more precise configuration of the busbar 302 and voltage detection line terminal 401, and improves workability during assembly.

[0109] (Battery packs in other embodiments) The battery pack of the present invention is not limited to the structure of the battery pack described in the embodiments, and can be appropriately configured based on the contents described in the claims.

[0110] The embodiments described in detail or in summary are for the purpose of illustrative purposes to facilitate understanding of the invention, and do not necessarily include all the structures described, or may include structures not shown. Furthermore, a portion of the structure of an embodiment may be omitted, replaced with structures from other embodiments, or combined with structures from other embodiments.

[0111] The battery pack 1 includes, but is not limited to, 24 batteries 100. The batteries 100 are not limited to lithium-ion batteries. For example, the batteries 100 can be nickel-metal hydride batteries and lead-acid batteries. The batteries 100 are not limited to rechargeable batteries. For example, the batteries 100 can be primary batteries.

[0112] Explanation of reference numerals in the attached figures 1 Battery pack (100 single cells), 200 Holding unit, 300 Busbar unit (sub-battery module), 302, 302a, 302b Busbars, 311 Busbar bracket, 321a, 321b, 421a, 421b Recesses (displacement limiting parts), 321c Hole (displacement limiting part), 331a, 331b Protrusions (displacement limiting receiving parts), 340 Joint, 360 Protrusion (displacement limiting receiving part), 400 Voltage detection unit, 401 Voltage detection line terminal, 402 Voltage detection line.

Claims

1. A battery pack, characterized in that, have: Multiple single batteries, The busbar electrically connects the terminals of the multiple individual batteries. The voltage detection line terminal is configured to overlap with the busbar and engage with the busbar. Busbar bracket, having a mounting area for the busbar and the voltage detection line terminals; The busbar and the voltage detection line terminal each have displacement limiting parts arranged in an overlapping manner. The busbar bracket has a displacement limiting receiving part that engages with the displacement limiting part to limit the displacement of the busbar and the voltage detection line terminal.

2. The battery pack according to claim 1, wherein, The displacement limiting part is a pair of recesses or a pair of protrusions provided on the edge of the busbar and the voltage detection line terminal.

3. The battery pack according to claim 2, wherein, Between the pair of recesses or the pair of protrusions, there is a joint for connecting the busbar to the voltage detection line terminal.

4. The battery pack according to claim 3, wherein, The joint is formed by laser welding.

5. The battery pack according to claim 2, wherein, The ratio (b / a) of the depth (b) to the width (a) of the recess or the protrusion is more than 1 / 5 and less than 4.

6. The battery pack according to claim 1, wherein, The displacement limiting part is a hole or recess provided in the busbar and the voltage detection line terminal, and the displacement limiting receiving part is a protrusion provided in the busbar bracket. The protrusion penetrates the hole or recess and engages with the hole or recess, thereby restricting the displacement of the busbar and the voltage detection line terminal.

7. The battery pack according to claim 6, wherein, A joint portion is provided to connect the busbar to the voltage detection line terminal in a manner that surrounds the displacement limiting portion.

8. A sub-battery module, characterized in that, have: Busbars are used to electrically connect the terminals of multiple individual batteries, and A busbar bracket is provided with a mounting area for the busbar; The displacement of the busbar is restricted by engaging the displacement limiting part disposed on the busbar and the displacement limiting receiving part disposed on the busbar bracket.

9. The sub-battery module according to claim 8, wherein, The sub-battery module also has a voltage detection line terminal that overlaps with the busbar and is disposed in the mounting area. The voltage detection line terminal has a displacement limiting portion, which is configured to be located at the same position as the displacement limiting portion disposed on the busbar when the voltage detection line terminal is overlapped with the busbar. The displacement limiting receiving part of the busbar bracket engages with the displacement limiting parts of both the busbar and the voltage detection line terminal to limit the displacement of the busbar and the voltage detection line terminal.

10. The sub-battery module according to claim 9, wherein, The sub-battery module is provided with a joint for connecting the busbar to the voltage detection line terminal.

11. A method for manufacturing a battery pack, wherein, include: The mounting process involves overlapping and arranging a busbar for electrically connecting the terminals of multiple individual cells and voltage detection line terminals to be coupled to the busbar in a predetermined mounting area of ​​the busbar support. The joining process involves joining the busbar to the voltage detection line terminal; In the mounting process, the displacement limiting part is configured to engage with the displacement limiting receiving part. The displacement limiting part is formed on the busbar and the voltage detection line terminal and is arranged to overlap each other. The displacement limiting receiving part is formed on the busbar support to limit the displacement of the busbar and the voltage detection line terminal.

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