Busbar module

Abstract

The present disclosure relates to a busbar module to be attached to a battery assembly in which a plurality of unit cells are stacked. The busbar module includes a main wire circuit body including a plurality of electric wires and arranged to extend along a stacking direction of the plurality of unit cells, a relay circuit body including a circuit board having a wiring pattern electrically connected to at least one electric wire extending branched from the main wire circuit body, a busbar to be connected to an electrode of each of the plurality of unit cells, an electronic element attached to a mounting surface of the relay circuit body to connect the wiring pattern to the busbar, and a holder to hold the busbar and to be stretchable and contractable along the stacking direction.

Description

Technical Field

[0001] This disclosure relates to a busbar module. Background Technology

[0002] In the prior art, busbar modules are used, for example, to be assembled into battery modules (battery modules in which multiple battery cells are stacked and arranged), which serve as a drive power source for electric vehicles, hybrid vehicles, etc., as disclosed in patent document JP2014-220128A.

[0003] The busbar module described in patent document JP2014-220128A includes: a plurality of busbars stacked and connecting the positive and negative terminals between adjacent battery cells; and a plurality of voltage detection lines connected to the plurality of busbars and monitoring the battery cells. Each of the plurality of voltage detection lines has a general construction in which its core wire is covered by an insulating sheath.

[0004] Meanwhile, from the perspective of improving the functionality of busbar modules, it is conceivable to include electronic components such as fuses in each voltage detection circuit (i.e., the circuit corresponding to each voltage detection line connecting the busbar to a processing device such as an ECU). However, in existing busbar modules, since the voltage detection circuit is not designed with the installation of such electronic components in mind, it is difficult to install the electronic components on a separate voltage detection circuit. Furthermore, when electronic components are inadvertently placed on the voltage detection circuit of existing busbar modules, the original function of the busbar module may be impaired (e.g., deformation of the battery assembly and responses to manufacturing deviations). Summary of the Invention

[0005] This disclosure provides a busbar module in which electronic components are mounted in a voltage detection circuit without impairing the original function of the busbar module.

[0006] According to this disclosure, a busbar module is mounted on a battery assembly having multiple stacked individual cells. The busbar module includes: a mainline circuit body comprising a plurality of wires arranged to extend along the stacking direction of the multiple individual cells; a relay circuit body comprising a circuit board having a wiring pattern electrically connected to at least one wire branching from the mainline circuit body; a busbar to be connected to the electrodes of each of the multiple individual cells; electronic components mounted on the mounting surface of the relay circuit body to connect the wiring pattern to the busbar; and a retainer that holds the busbar and is retractable along the stacking direction.

[0007] The present disclosure has been briefly described above. Furthermore, the details of the disclosure will become clearer when reading the following description of how to implement the disclosure with reference to the accompanying drawings. Attached Figure Description

[0008] Figure 1 This is a perspective view showing the busbar module according to this embodiment;

[0009] Figure 2 It is shown Figure 1 A perspective view of the battery assembly to which the busbar module is assembled;

[0010] Figure 3 It is a perspective view showing the state in which the busbar is connected to each of the multiple relay circuits connected to the main circuit body;

[0011] Figure 4 It is a perspective view showing a relay circuit connected to the main circuit body;

[0012] Figure 5 It is a perspective view showing the state of the busbar connected to the relay circuit body connected to the main circuit body;

[0013] Figure 6 It is shown as follows Figure 1 A perspective view of the retainer and cap shown;

[0014] Figure 7 This is a bottom view showing the connection between the relay circuit body and the busbar; and

[0015] Figure 8 It is a perspective view showing the state of the relay circuit body connected to the branch line extending in a manner from the main circuit body. Detailed Implementation

[0016] Example

[0017] Hereinafter, a busbar module 10 according to an embodiment of the present disclosure will be described with reference to the accompanying drawings. The busbar module 10 according to this embodiment is used, for example, to be assembled to a long battery assembly 1 (see figure 1) which serves as a drive power source for an electric vehicle. Figure 2 (A battery module with multiple individual cells stacked and arranged).

[0018] In the following text, for ease of description, "front," "back," "left," "right," "up," and "down" will be used as follows: Figure 1 As shown in the definition. The "front-back direction," "left-right direction," and "up-down direction" are orthogonal to each other. The front-back direction is perpendicular to the stacking direction of the multiple individual cells 2 constituting the battery assembly 1 (see...). Figure 1 and Figure 2 (This is consistent with the previous sentence.) Note that these directions are defined for ease of description, and when the busbar module 10 is installed in a vehicle, these directions do not necessarily correspond to the vehicle's front-to-back, left-to-right, and up-down directions.

[0019] First, as preparation for describing busbar module 10, reference will be made to... Figure 2 Describes the battery assembly 1 to which the busbar module 10 is connected. For example... Figure 2 As shown, the battery assembly 1 is formed by stacking multiple rectangular flat single cells 2 extending in the vertical and horizontal directions in the front-back direction. Each of the multiple single cells 2 includes: a battery body 3 having a rectangular flat shape; and a positive electrode 4 and a negative electrode 5 protruding upward from the left and right ends of the upper surface 6 of the battery body 3.

[0020] In the battery assembly 1, multiple single cells 2 are stacked such that the positive electrode 4 and the negative electrode 5 of the single cells 2 that are adjacent to each other in the front-back direction are opposite to each other in the left-right direction, and the positive electrode 4 and the negative electrode 5 are arranged alternately in the front-back direction at each end of the left and right ends of the upper surface of the battery assembly 1.

[0021] The busbar module 10 will be described below. For example... Figure 1 , Figure 3 and Figure 6 As shown, the busbar module 10 includes: a mainline circuit body 20 extending in the front-to-back direction (see...). Figure 3 The busbar module 10 comprises: a plurality of relay circuits 30 connected to the main circuit 20; a plurality of busbars 40 connected to the plurality of relay circuits 30; a plurality of electronic components 50 mounted on the plurality of relay circuits 30; a retainer 60 holding the main circuit 20, the relay circuits 30 and the busbars 40; and a cover 70 covering the main circuit 20 and the relay circuits 30. The components constituting the busbar module 10 will be described in sequence below.

[0022] First, the main circuit body 20 will be described. From Figure 1 and Figure 3 It is understood that the main circuit body 20 includes: a pair of left and right trunk lines 21, each comprising multiple wires and extending in the front-back direction at intervals in the left-right direction; and a junction 22 in which one end of all the wires constituting the pair of trunk lines 21 is brought together. A connector (not shown) for connection to an external voltage detection device (not shown), etc., is installed in the junction 22. Each wire has a structure in which the conductor core is surrounded by an insulating sheath. Therefore, adjacent wires are not electrically connected (short-circuited) to each other.

[0023] From multiple positions in the front-back direction of each of the two main lines 21, the other end of a corresponding wire of that main line 21 (hereinafter referred to as "branch 23") extends outward in the left-right direction to branch off from the main line 21 (see...). Figure 3 The corresponding relay circuit body 30 is connected to each branch line 23 via metal terminals 24. For example... Figure 8As shown, terminal 24 integrally includes: crimp portion 25, on which the conductor core of branch line 23 is crimped and fixed; and flat plate connection portion 26, which is connected to the wiring pattern 37 exposed from the opening 31a of relay circuit body 30, which will be described later.

[0024] When the relay circuit body 30 is connected to the main circuit body 20, the connection portion 26 of the terminal 24 connected to the branch line 23 is electrically connected to the wiring pattern 37 of the relay circuit body 30 by soldering (see...). Figure 8 Thus, the wiring pattern 37 of each relay circuit 30 is independently (i.e., in a state of insulation from the wiring pattern 37 of another relay circuit 30) sequentially connected to an external voltage detection device (not shown) via terminal 24, branch line 23, main line 21, collection section 22, and connector mounted on collection section 22. Since the relay circuit 30 is connected to the main line 21 (main circuit 20) via the easily bendable branch line 23, the relay circuit 30 is electrically connected in the front-back direction, left-right direction, and up-down direction (see...). Figure 5 The white arrow in the middle indicates that the terminal 24 (main circuit body 20) has high relative mobility relative to the main line 21. Typically, soldering can be performed using a method known as pulsed thermal soldering: after sandwiching solder paste between the connection portion 26 of the terminal 24 and the wiring pattern 37, a heating chip capable of heating the solder to a melting temperature is pressed against the soldering portion, and the heating chip is heated to perform soldering. Soldering can be performed using a reflow soldering process in a heating furnace. Alternatively, the electrical connection between the connection portion 26 of the terminal 24 and the wiring pattern 37 can be achieved using ultrasonic welding or conductive adhesive instead of the aforementioned soldering.

[0025] Next, the relay circuit body 30 will be described. The relay circuit body 30 is implemented using a flexible printed circuit board (FPC) that is easily bent. Figure 3 As shown, the relay circuit body 30 is connected via terminal 24 to branch lines 23 that branch outward in the left and right directions from each of the left and right main lines 21 of the main line circuit body 20.

[0026] like Figure 8 As shown, the relay circuit body 30 is generally a flat plate extending upwards in the front-to-back direction and left-to-right direction, and is longer in the front-to-back direction. The entire surface of the relay circuit body 30, except for the openings 31a, 36a, and 36b (which will be described later), is [see details missing]. Figure 8 Except for the resin layer, it is formed of wiring patterns 37 and 38, which will be described later (see Figure 7 and Figure 8 Each wiring pattern 37, 38 is typically made of copper and consists of conductor patterns extending in strips.

[0027] The terminal-side connection portion 31 is disposed approximately at the center of the relay circuit body 30 in the front-rear direction. The terminal-side connection portion 31 is a portion that connects to a terminal 24 that connects to a branch line 23 branching from the trunk line 21 (main circuit body 20). A pair of openings 31a (see [reference]) are provided on the upper surface of the terminal-side connection portion 31, allowing the surface resin layer to be removed and the wiring pattern 37 to be exposed therefrom. Figure 8 The wiring pattern 37 exposed in the opening 31a extends through the interior of the relay circuit body 30 to the opening 36a provided in the busbar-side connection 36, which will be described later (see...). Figure 7 and Figure 8 ).

[0028] A busbar-side connection portion 36 is provided at the rear end of the relay circuit body 30. The busbar-side connection portion 36 is the part to which the busbar 40 is connected (see...). Figure 5 (etc.). For example... Figure 7 and Figure 8 As shown, on the lower surface of the busbar-side connection portion 36, an opening 36a with the surface resin layer removed is provided at the center in the left-right direction, and openings 36b with the surface resin layer removed are formed at a pair of left and right positions that sandwich the openings 36a in the left-right direction. In the front region of the opening 36a, the end of the wiring pattern 37 is exposed, while in the rear region of the opening 36a, a portion of the wiring pattern 38, which is separated from the wiring pattern 37 and included in the busbar-side connection portion 36, is exposed. In each of the pair of openings 36b, the remaining portion of the wiring pattern 38 is exposed.

[0029] When busbar 40 is connected to relay circuit body 30, use solder H (see Figure 7 The wiring pattern 38 exposed at a pair of openings 36b and the extension 42 of the busbar 40, described later (see below) Figure 3 , Figure 5 and Figure 7 ).

[0030] Electronic component 50 is mounted in the opening 36a of relay circuit body 30 (see Figure 8 (etc.). Electronic component 50 is typically a chip fuse. Electronic component 50 is soldered to wiring patterns 38 and 37 using solder H (see...). Figure 7 The wiring pattern 38 and wiring pattern 37 exposed at the opening 36a are connected across each other via the electronic component 50. Thus, the wiring pattern 38 (i.e., busbar 40) and wiring pattern 37 (i.e., branch line 23 branching from the main circuit body 20) are electrically connected to each other via the electronic component 50. Therefore, the electronic component 50 can be provided on each voltage detection circuit connecting the busbar 40 and the voltage detection device.

[0031] Electronic component 50 is preferably mounted on relay circuit body 30 in a state before relay circuit body 30 is connected to the long main circuit body 20, which is formed to be long in the front-to-back direction (the state in which relay circuit body 30 is alone). By mounting electronic component 50 in the state of relay circuit body 30 alone, compared with the case where the main circuit body 20 and relay circuit body 30 are implemented by a common circuit board (e.g., flexible board), it is not necessary to set up a large mounting device. In other words, since the main circuit body 20 and relay circuit body 30 are separate entities, electronic component 50 can be properly mounted on relay circuit body 30 regardless of the length and size of main circuit body 20, and the manufacturing cost of busbar module 10 can be reduced. In addition, since the main circuit body 20 includes multiple wires, the position of the wires is easier to change compared with the case where the main circuit body 20 is implemented by a circuit board. Therefore, it is easy to arrange the wires side by side in the connector to be installed in the assembly part 22 in the desired order (e.g., according to the potential order of busbar 40).

[0032] Next, busbar 40 will be described. Busbar 40 is formed from a single sheet of metal that has undergone pressing (stamping), bending, or similar processes. Figure 3 As shown, the busbar 40 includes: a busbar body 41 having a generally rectangular flat plate shape; and an extension 42 extending inward in the left-right direction from the rear end of the inner edge of the busbar body 41 extending in the front-rear direction. A through hole 43 opening in the thickness direction (vertical direction) is formed at the extension end of the extension 42. Figure 5 and Figure 7 The through hole 43 serves as a clearance to prevent interference between the extended end of the extension 42 of the busbar 40 and the electronic component 50 when the busbar 40 is connected to the relay circuit body 30.

[0033] Next, the retainer 60 will be described. The retainer 60 is a resin-molded article, and as... Figure 6 As shown, the device integrally includes: a pair of plate-shaped circuit body holding portions 61 arranged at intervals in the left-right direction and extending in the front-back direction respectively; and a plurality of connecting portions 62 at multiple positions in the front-back direction connecting the pair of left-right circuit body holding portions 61 in the left-right direction. The pair of main line circuit bodies 20 (trunk lines 21) of the main line circuit body 20 and a plurality of relay circuit bodies 30 respectively connected to a plurality of branch lines 23 branching from the main line circuit bodies 20 (trunk lines 21) are placed in the pair of left-right circuit body holding portions 61.

[0034] Specifically, each of the pair of circuit body holding portions 61 extending in the front-rear direction includes: a plurality of partitions 61a arranged side by side in the front-rear direction; and a telescopic portion 63 that connects the partitions 61a adjacent to each other in the front-rear direction. Each telescopic portion 63 has a shape that allows it to easily extend and contract in the front-rear direction due to elastic deformation. Therefore, the pair of circuit body holding portions 61 are telescopic in the front-rear direction.

[0035] For each of the left and right pair of circuit body holding portions 61, each of the plurality of partitions 61a arranged in the front-back direction is integrally provided with a busbar holding portion 64 adjacent to the outer side in the left-right direction. That is, a plurality of busbar holding portions 64 are arranged side by side in the front-back direction on the outer side in the left-right direction of each of the left and right pair of circuit body holding portions 61. Since each busbar holding portion 64 is provided in the corresponding partition 61a, the front-back spacing between adjacent busbar holding portions 64 in the front-back direction can be changed by the function of the telescopic portion 63.

[0036] The busbar body 41 of the busbar 40 is housed in the busbar holding portion 64. Therefore, the busbar holding portion 64 has an upwardly opening, generally rectangular box shape corresponding to the shape of the busbar body 41. A cutout 65 is formed in the portion of the rectangular frame-shaped sidewall of the busbar holding portion 64 that intersects with the extension 42 of the busbar 40 to avoid interference with the extension 42. An opening 66 extending in the front-rear direction is formed in the bottom wall of the busbar holding portion 64. When the holder 60 is attached to the battery assembly 1, the positive electrode 4 and the negative electrode 5, adjacent to each other in the front-rear direction, are arranged in the opening 66 of the busbar holding portion 64.

[0037] Next, the cover 70 will be described. As a resin-molded product, the cover 70 has the function of covering a pair of main lines 21 extending in the front-rear direction of the main circuit body 20, and multiple relay circuit bodies 30 respectively connected to multiple branch lines 23 branching from the main lines 21. The main circuit body 20 and the multiple relay circuit bodies 30 are placed on a pair of left and right circuit body holding portions 61 extending in the front-rear direction of the holder 60 (see...). Figure 1 Therefore, as Figure 6 As shown, the cover 70 has a strip-like shape that is long in the front-to-back direction. The components constituting the busbar module 10 have been described above.

[0038] When the busbar module 10 is assembled to the battery assembly 1, multiple stacked individual cells 2 in the battery assembly 1 are electrically connected in series via multiple busbars 40. Furthermore, each busbar 40 is electrically connected to an external voltage detection device sequentially via a wiring pattern 38 of a corresponding relay circuit 30, an electronic component 50, a wiring pattern 37 of a corresponding relay circuit 30, a terminal 24, a corresponding branch line 23, a trunk line 21, a collection section 22, and a connector mounted on the collection section 22. Thus, the voltage (potential) of each busbar 40 can be detected by the external voltage detection device. When an overcurrent exceeding the rated current flows through the electronic component 50 for some reason, the electrical connection between wiring patterns 37 and 38 is severed by the electronic component 50 due to the fuse function of the electronic component 50. This prevents overcurrent from flowing into the voltage detection device, thereby protecting the voltage detection device.

[0039] When the battery assembly 1 is in use with the busbar module 10 installed, each individual cell 2 constituting the battery assembly 1 may expand or contract in the stacking direction (front-to-back direction) due to operating heat related to charging and discharging, ambient temperature, etc. Therefore, the battery assembly 1 may deform in a manner that expands and contracts in the stacking direction (front-to-back direction). Furthermore, due to assembly tolerances when multiple individual cells 2 are stacked and arranged, the dimensions of the battery assembly 1 in the stacking direction (front-to-back direction) may differ for each manufactured battery assembly 1 (manufacturing deviation may occur).

[0040] Therefore, in the busbar module 10, even if the battery assembly 1 expands and contracts in the stacking direction (front-back direction) due to the thermal deformation of each individual cell 2 and the manufacturing deviation of the battery assembly 1, the expansion and contraction caused by the thermal deformation and manufacturing deviation of the battery assembly 1 can be easily absorbed because each of the multiple telescopic portions 63 of the retainer 60 expands and contracts in the front-back direction, and the branch line 23 branching from the main circuit body 20 (main line 21) is easy to bend.

[0041] Functions and effects

[0042] As described above, according to the busbar module 10 of this embodiment, the relay circuit body 30 implemented by the circuit board is electrically connected to the wires (branch lines 23) extending branch from the main circuit body 20 (trunk line 21) which includes multiple wires. Electronic components 50 are mounted (i.e., installed) on the relay circuit body 30, and the wiring pattern 38 of the relay circuit body 30 is interconnected with the busbar 40 through the electronic components 50. That is, the busbar 40 and the wires (branch lines 23) are electrically connected to each other through the electronic components 50 of the relay circuit body 30. Therefore, electronic components 50 can be provided on each voltage detection circuit. Furthermore, when the battery assembly 1 expands and contracts in the stacking direction due to the thermal deformation of each individual cell 2, each busbar 40 can move in the stacking direction of the individual cell 2 by bending of the branch lines 23, etc. Similarly, when the branch lines 23 bend, etc., dimensional deviations of the battery assembly 1 in the stacking direction caused by the assembly tolerances of the individual cells 2 can be absorbed. In other words, the busbar module 10 according to this embodiment can easily cope with the expansion and contraction of the battery assembly 1 and manufacturing deviations caused by the deformation of the branch line 23. Therefore, the busbar module 10 according to this embodiment has a configuration that allows electronic components to be installed in the voltage detection circuit without impairing the original function of the busbar module.

[0043] Furthermore, in the busbar module 10 of this embodiment, the main circuit 20 and the relay circuit 30 are manufactured as separate entities and electrically connected. When the electronic component 50 is mounted (i.e., installed) on the relay circuit 30, which is manufactured as a separate entity, a large mounting device for mounting the electronic component 50 is not required, compared to the case where the main circuit 20 and the relay circuit 30 are implemented as a single circuit board (e.g., a flexible board). In other words, regardless of the length and size of the main circuit 20, the electronic component 50 can be properly mounted on the relay circuit 30 using a common mounting device, thereby reducing the manufacturing cost of the busbar module 10. In addition, compared to the case where the main circuit 20 is implemented as a circuit board, the wire positions are easy to change, making it easier to arrange the wires side-by-side in a desired order (e.g., according to the potential order of the busbar 40) to the input connector of a control device such as an ECU.

[0044] Other embodiments

[0045] This disclosure is not limited to the above embodiments, and various modifications can be made within the scope of this disclosure. For example, this disclosure is not limited to the above embodiments, and appropriate modifications and improvements can be made. Furthermore, as long as this disclosure can be implemented, the material, shape, size, quantity, and arrangement of each component in the above embodiments can be freely selected and are not limited.

[0046] In the above embodiment, the relay circuit body 30 is implemented using a flexible printed circuit (FPC). On the other hand, the relay circuit body 30 can be implemented using a rigid plate.

[0047] Furthermore, in the above embodiment, the wiring pattern 37 of the relay circuit body 30 is indirectly connected to the conductor core of the branch line 23 through a terminal 24 connected to the conductor core of the branch line 23 branching from the main circuit body 20. On the other hand, the wiring pattern 37 of the relay circuit body 30 can be directly connected to the conductor core of the branch line 23 branching from the main circuit body 20.

[0048] Here, the features of the above embodiments of the busbar module 10 according to the present disclosure will be briefly summarized and listed in the following first to fourth aspects.

[0049] According to a first aspect of this disclosure, a busbar module (10) is mounted on a battery assembly (1) having a plurality of individual cells (2) stacked thereon. The busbar module (10) includes: a main circuit body (20) having a plurality of wires and arranged to extend along the stacking direction of the plurality of individual cells (2); a relay circuit body (30) having a circuit board having wiring patterns (37, 38) electrically connected to at least one wire branching from the main circuit body (20); a busbar (40) to be connected to the electrodes (4, 5) of each of the plurality of individual cells (2); an electronic component (50) mounted on the mounting surface of the relay circuit body (30) to connect the wiring pattern (38) to the busbar (40); and a retainer (60) that holds the busbar (40) and is retractable along the stacking direction.

[0050] According to the busbar module with the configuration described in the first aspect, the relay circuit body implemented by the circuit board is electrically connected to the wires (hereinafter, also called branch lines) extending from the main circuit body (hereinafter, also called trunk line) which includes multiple wires. Electronic components are mounted (i.e., installed) on the relay circuit body, and the wiring pattern of the relay circuit body and the busbar are interconnected through the electronic components. That is, the busbar and the wires (branch lines) are interconnected through the electronic components of the relay circuit body. Therefore, electronic components can be provided on each voltage detection circuit. Furthermore, when the battery pack expands and contracts in the stacking direction due to the thermal deformation of each individual cell, each busbar can move in the stacking direction of the individual cells by bending of the branch lines, etc. Similarly, by bending of the branch lines, etc., the dimensional deviation of the battery pack in the stacking direction caused by the assembly tolerance of the individual cells can be absorbed. In other words, the busbar module of this configuration can easily cope with the expansion and contraction of the battery pack and manufacturing deviations caused by the deformation of the branch lines. Therefore, the busbar module of this configuration has the ability to mount electronic components on the voltage detection circuit without compromising the original function of the busbar module.

[0051] Furthermore, according to the busbar module with the above configuration, the main circuit body and the relay circuit body are prepared as separate entities and electrically connected. When electronic components are mounted (i.e., installed) on the relay circuit body prepared as separate entities, compared to the case where the main circuit body and the relay circuit body are implemented from a single circuit board (e.g., a single continuous flexible board), it is not necessary to provide a large mounting device for mounting electronic components. In other words, regardless of the length and size of the main circuit body, electronic components can be properly mounted on the relay circuit body using a general mounting device, and the manufacturing cost of the busbar module can be reduced. In addition, compared to the case where the main circuit body is implemented from a circuit board, the wire positions are easy to change, making it easy to arrange the wires side by side in the desired order (e.g., according to the potential of the busbar) to the input connector of a control device such as an ECU.

[0052] According to a second aspect of this disclosure, the circuit board of the relay circuit body (30) includes a flexible board or a rigid board.

[0053] According to the busbar module with the configuration described in the second aspect, the relay circuit body with the electronic components can be manufactured using existing general mounting devices by utilizing flexible or rigid plates.

[0054] According to a third aspect of this disclosure, the wiring pattern (37) of the relay circuit body (30) is directly connected to the conductor core of at least one of the wires (23) or connected to the conductor core via a terminal (24) connected to the conductor core.

[0055] According to the busbar module with the configuration described in the third aspect above, the wiring pattern of the relay circuit body is directly connected to the conductor core of the wire (branch), or indirectly connected to the conductor core through terminals connected to the conductor core. Using existing electrical connection technologies, the relay circuit body can be incorporated into the busbar module without incurring significant costs. This connection method can be appropriately selected considering factors such as the cost of connection processing and connection strength. For example, this connection can be achieved using methods such as welding, ultrasonic bonding, or bonding using conductive adhesives.

Claims

1. A busbar module, the busbar module being connected to a battery assembly having multiple stacked individual cells, the busbar module comprising: The main circuit body includes a plurality of wires and is arranged to extend along the stacking direction of the plurality of said single cells; A relay circuit body includes a circuit board having a wiring pattern electrically connected to at least one of the wires extending branching from the main circuit body; A busbar, which is to be connected to the electrodes of each of the plurality of said single cells; An electronic component is mounted on the mounting surface of the relay circuit body to connect the wiring pattern to the busbar; as well as A retainer that holds the busbar and is extendable along the stacking direction.

2. The busbar module according to claim 1, in, The circuit board of the relay circuit includes a flexible board.

3. The busbar module according to claim 1, in, The circuit board of the relay circuit body includes a rigid board.

4. The busbar module according to claim 1, in, The wiring pattern of the relay circuit body is directly connected to the conductor core of the at least one of the wires.

5. The busbar module according to claim 1, in, The wiring pattern of the relay circuit body is connected to the conductor core via a terminal connected to the conductor core of the at least one of the wires.

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