Busbar and battery pack

Abstract

In the process of connecting multiple cylindrical battery cells in series and parallel, weld flatness is ensured to improve the workability and productivity of the process. [Solution] The battery includes a housing, a plurality of first battery cells housed in the housing and having a first positive terminal and a first negative terminal, a plurality of second battery cells housed in the housing and having a second positive terminal and a second negative terminal, a first busbar connecting the first negative terminals of the plurality of first battery cells, a second busbar connecting the second positive terminals of the plurality of second battery cells, and a third busbar connecting the first positive terminal of the first battery cell and the second negative terminal of the second battery cell, wherein at least one of the first busbar, the second busbar and the third busbar is deformable in shape depending on the positions of the first battery cells and the second battery cells.

Description

Technical Field

[0001] The present disclosure relates to a bus bar and a battery pack.

Background Art

[0002] Generally, as the demand for portable electronic products such as notebook PCs, video cameras, and portable telephones has rapidly increased, and as the commercialization of robots, electric vehicles, etc. has been in full swing, research on high-performance secondary batteries capable of repeated charging and discharging has been actively carried out. In particular, lithium secondary batteries are widely used as an energy source for various electronic products because they have a high energy density, an operating voltage, and excellent storage and life characteristics.

[0003] Among such lithium secondary batteries, a cylindrical secondary battery includes a cylindrical electrode assembly, a cylindrical can that houses the electrode assembly and an electrolytic solution, and a cap assembly that is coupled to an opening of the can to seal the can and allow current generated from the electrode assembly to flow to an external device. The cylindrical secondary battery has a structure in which the can with a negative electrode and the cap assembly with a positive electrode are insulated from each other by a gasket.

[0004] When a cylindrical secondary battery forms a pack, the welding position connected to an electrode connector or a controller is placed horizontally in the length direction of the cylindrical secondary battery or parallel to the body direction. At this time, it is necessary to maintain flatness during laser welding or resistance welding.

[0005] The above-described information disclosed in the technology that is the background of such an invention is only for improving the understanding of the background of the present invention, and thus may include information that does not constitute the prior art.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

[0007] The present invention aims to provide a busbar and battery pack that can improve the workability and productivity of a process by ensuring welding flatness during the process of connecting multiple cylindrical battery cells in series and parallel.

[0008] However, the technical problems that the present invention aims to solve are not limited to those described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention below. [Means for solving the problem]

[0009] A busbar according to one embodiment of the present invention for solving the aforementioned technical problems includes a first parallel connecting portion and a first parallel extension portion extending from the first parallel connecting portion in a first direction, wherein the first parallel connecting portion includes a first parallel center plate, a first parallel connecting plate extending from the first parallel center plate in a direction parallel to a second direction intersecting the first direction, and a first connection adjustment portion formed on the first parallel connecting plate and provided to be length adjustable along the second direction.

[0010] The first connection adjustment section can form a "U" shape or a "V" shape bend.

[0011] The first parallel extension may include a first parallel side plate connected to the first parallel connecting portion and arranged in line with the first direction, a first parallel upper plate extending from the first parallel side plate and arranged to intersect with the first parallel side plate, and a first side plate adjustment portion formed on the first parallel side plate and provided to be length-adjustable along the first direction.

[0012] The first side plate adjustment section is bent into a zigzag shape.

[0013] A battery pack according to one embodiment of the present invention for solving the aforementioned technical problems includes a housing, a plurality of first battery cells housed in the housing and having a first positive terminal and a first negative terminal, a plurality of second battery cells housed in the housing and having a second positive terminal and a second negative terminal, a first busbar connecting the first negative terminals of the plurality of first battery cells, a second busbar connecting the second positive terminals of the plurality of second battery cells, and a third busbar connecting the first positive terminal of the first battery cells and the second negative terminal of the second battery cells, wherein at least one of the first busbar, the second busbar, and the third busbar is deformable in shape depending on the positions of the first battery cells and the second battery cells.

[0014] The first positive terminal and the second negative terminal may be arranged to face a first direction, or the first negative terminal and the second positive terminal may be arranged to face a direction opposite to the first direction.

[0015] The first busbar may include a first parallel connection portion that connects adjacent first negative terminals in parallel, and a first parallel extension portion that extends from the first parallel connection portion in the first direction.

[0016] A plurality of the first battery cells are arranged in a row along a second direction intersecting the first direction, and the first parallel connection portion may include a first parallel center plate, a first parallel connection plate extending from the first parallel center plate parallel to the first direction and connected to the first negative terminal, and a first connection adjustment portion formed on the first parallel connection plate and provided to be length-adjustable along the second direction.

[0017] The first connection adjustment section can form a "U" shape or a "V" shape bend.

[0018] The second busbar may include a second parallel connection portion that connects adjacent second positive terminals in parallel, and a second parallel extension portion that extends from the second parallel connection portion in the first direction.

[0019] A plurality of the second battery cells are arranged along a second direction intersecting the first direction, and the second parallel connection portion may include a second parallel center plate, a second parallel connection plate extending from the second parallel center plate parallel to the second direction and connecting to the second positive terminal, and a second connection adjustment portion formed on the second parallel connection plate and provided to be length-adjustable along the second direction.

[0020] The second connection adjustment section can form a "U" shape or a "V" shape bend.

[0021] The second parallel extension may include a second parallel side plate connected to the second parallel connecting portion and arranged in line with the first direction, a second parallel upper plate extending from the second parallel side plate and arranged to intersect with the second parallel side plate, and a second side plate adjustment portion formed on the second parallel side plate and provided to be length-adjustable along the first direction.

[0022] The second side plate adjustment section is bent into a zigzag shape.

[0023] The third busbar may include a plurality of third series sections connecting the first positive terminal and the second negative terminal in series, a third connecting section connecting the plurality of third series sections, and one or more third adjusting sections formed in the third connecting section, which are length-adjustable along a second direction intersecting the first direction.

[0024] The first battery cell and the second battery cell are arranged to face each other along a third direction intersecting the first direction and the second direction, and the third series part includes a third series center plate, and a third series connection plate extending from the third series center plate in a direction parallel to the third direction and connected to the first positive terminal and the second negative terminal respectively, and a third connection adjustment part formed on the third series connection plate and provided with length adjustment along the third direction.

[0025] The third adjustment part can form a "U" - shaped or "V" - shaped bending.

[0026] A battery pack according to an embodiment of the present invention for solving the above - mentioned technical problem is provided in the housing, and further includes an elastic member that supports a plurality of the first battery cells and a plurality of the second battery cells and enables height compensation.

Effect of the Invention

[0027] The battery pack according to an embodiment of the present invention can improve the workability of subsequent processes by making the upper heights of the first bus bar, the second bus bar, and the third bus bar that connect a plurality of first battery cells in parallel, a plurality of second battery cells in parallel, and the first battery cells and the second battery cells in series respectively, coincide through displacement adjustment.

[0028] When the flatness of the first bus bar, the second bus bar, and the third bus bar of the battery pack according to an embodiment of the present invention is the same, even if the connector is seated on them in an automated process, the contact between the connector and the first bus bar, the second bus bar, and the third bus bar can be stably maintained, so laser welding can be performed without an additional process for maintaining the contact state.

[0029] However, the effects obtained through the present invention are not limited to those described above, and other technical effects not mentioned can be clearly understood by those skilled in the art from the description of the invention below. [Brief explanation of the drawing]

[0030] The following drawings accompanying this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention described later, serve to further illustrate the technical concept of the present invention. Therefore, the present invention should not be construed as being limited solely to the matters described in such drawings.

[0031] [Figure 1] This figure schematically shows a busbar according to one embodiment of the present invention. [Figure 2] This is a schematic plan view showing a first parallel connection section according to one embodiment of the present invention. [Figure 3] This is a schematic side view showing a first parallel connection section according to one embodiment of the present invention. [Figure 4] This is a schematic side view showing a first parallel extension according to one embodiment of the present invention. [Figure 5] This figure schematically shows a battery pack according to one embodiment of the present invention. [Figure 6] This is a schematic front perspective view showing the inside of a battery pack according to one embodiment of the present invention. [Figure 7] This is a schematic bottom perspective view showing the inside of a battery pack according to one embodiment of the present invention. [Figure 8] This figure schematically shows a second busbar according to one embodiment of the present invention. [Figure 9] This is a schematic plan view showing a second parallel connection section according to one embodiment of the present invention. [Figure 10] This is a schematic side view showing a second parallel connection section according to one embodiment of the present invention. [Figure 11] This is a schematic side view showing a second parallel extension according to one embodiment of the present invention. [Figure 12]This is a schematic perspective view showing a third busbar according to one embodiment of the present invention. [Figure 13] This is a schematic plan view showing a third busbar according to one embodiment of the present invention. [Figure 14] This is a schematic side view showing a third series section according to one embodiment of the present invention. [Figure 15] This is a schematic side view showing a third connecting portion according to one embodiment of the present invention. [Figure 16] This is a schematic perspective view showing a block according to one embodiment of the present invention. [Figure 17] Figure 1 shows an elastic member added according to one embodiment of the present invention. [Figure 18] Figure 1 shows an additional connecting body according to one embodiment of the present invention. [Figure 19] This is a schematic perspective view showing the state of a connected body according to one embodiment of the present invention before welding. [Figure 20] This is a schematic cross-sectional view showing the welded joint state of a connected body according to one embodiment of the present invention. [Modes for carrying out the invention]

[0032] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted in a manner limited to their ordinary or dictionary meanings, but rather should be interpreted in a manner consistent with the technical idea of ​​the present invention, in accordance with the principle that inventors may appropriately define the concepts of terms in order to best describe their invention. Accordingly, the embodiments described herein and the configurations illustrated in the drawings are only some of the most preferred embodiments of the present invention and do not represent the entire technical idea of ​​the present invention, and it should be understood that there are various equivalents and modifications that may substitute for them at the time of filing. Furthermore, as used herein, "comprise, include" and / or "comprising, including" specify the existence of the shapes, figures, stages, actions, members, elements and / or groups thereof mentioned, and do not exclude the existence or addition of one or more other shapes, figures, actions, members, elements and / or groups thereof. Furthermore, when describing embodiments of the present invention, "may" and "may include" may include "one or more embodiments of the present invention."

[0033] Furthermore, to aid in understanding the invention, the accompanying drawings are not drawn to actual scale, and the dimensions of some components may be exaggerated. Also, the same reference numeral may be assigned to the same component in different embodiments.

[0034] The statement that two comparison objects are "identical" means that they are "substantially identical." Therefore, substantially identical objects may include those with deviations considered low in this industry, for example, deviations of 5% or less. Also, the uniformity of parameters within a given region may mean that they are uniform in terms of averages.

[0035] Even if terms such as "first," "second," etc., are used to describe a variety of components, these components are, of course, not limited by these terms. These terms are simply used to distinguish one component from another, and unless otherwise specified, the first component may be the second component.

[0036] Throughout the specification, unless otherwise specifically stated, each component may be singular or plural.

[0037] The placement of any configuration "above (or below)" or "above (or below)" a component means not only that the configuration is placed in contact with the upper (or lower) surface of the component, but also that other configurations may be interposed between the component and any configuration placed on (or below) it.

[0038] Furthermore, when it is stated that one component is “connected,” “joined,” or “connected” to another component, it should be understood that the components are directly connected to or can be connected to one another, but that other components are “interposed” between them, or that each component can be “connected,” “joined,” or “connected” through other components. Also, when it is said that one part is electrically coupled to another part, this includes not only cases where they are directly connected, but also cases where other elements are in between to connect them.

[0039] Throughout the specification, when "A and / or B" is written, it means A only, B only, or A and B, unless otherwise specified. That is, "and / or" includes all combinations or any combination of the enumerated items. When "C to D" is written, it means C or greater and D or less, unless otherwise specified.

[0040] When syntax such as "at least one of A, B, and C", "at least one of A, B, or C", "at least one selected from the group A, B, and C", or "at least one selected from A, B, and C" is used to specify a list of elements A, B, and C, the syntax can refer to any suitable combination.

[0041] The term "use" can be considered synonymous with the term "utilize." As used herein, "substantially," "about," and similar terms are used as approximations, not terms of degree, to account for the inherent variability of measured or calculated values ​​as perceived by a general expert in the art.

[0042] In this specification, terms such as first, second, third, etc., may be used to describe various elements, components, regions, layers, and / or sections, but these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, drawing layer, or section from other elements, components, regions, drawing layers, or sections. Accordingly, the first elements, components, regions, layers, or sections discussed below may be named second elements, components, regions, layers, or sections without deviating from the teaching of the exemplary embodiments.

[0043] As shown in the drawings, spatial relative terms such as “beneath,” “below,” “lower,” “above,” and “upper” may be used herein for ease of explanation to describe the relationship between one element or feature and another. Spatially relative positions should be understood to encompass different directions of the device in use or operation, in addition to the direction depicted in the figure. For example, if the device in the drawing is inverted, an element described as “beneath” or “below” another element will be understood as “above” or “upper” another element. Thus, the term “beneath” can encompass all directions, both up and down.

[0044] The terms used herein are for the purpose of describing the embodiments of this disclosure and are not intended to limit this disclosure.

[0045] In the following description of the present invention through multiple embodiments, redundant descriptions of components that are identical or corresponding to each other across multiple embodiments will be omitted. For example, if a configuration disclosed in one embodiment is identical or corresponding to a configuration disclosed in another embodiment, such configurations will be omitted from the description of the other embodiment, and the descriptions will mainly focus on configurations that differ from those disclosed in the first embodiment.

[0046] Figure 1 is a schematic diagram showing a busbar according to one embodiment of the present invention, Figure 2 is a schematic plan view showing a first parallel connection section according to one embodiment of the present invention, Figure 3 is a schematic side view showing a first parallel connection section according to one embodiment of the present invention, and Figure 4 is a schematic side view showing a first parallel extension section according to one embodiment of the present invention.

[0047] Referring to Figures 1 to 4, the first busbar 40 may include a first parallel connection section 41 and a first parallel extension section 42.

[0048] The first parallel connection section 41 forms the exterior of one side of the first busbar 40 and can support the first parallel extension section 42. The first parallel connection section 41 can function as a configuration that provides an electrical connection between the first busbar 40 and electronic equipment such as battery cells.

[0049] The first parallel extension 42 may extend from the first parallel connection 41 in a first direction. The first direction described below may mean an upward direction parallel to the Z-axis, with reference to Figure 1. The first parallel extension 42 is formed integrally with the first parallel connection 41, and electrical connections may be made on its surface. A portion of the first parallel extension 42 may be electrically connected to a circuit board such as a PCM (Protection Circuit Module) or a BMS (Battery Management System).

[0050] The first parallel connection section 41 may include a first parallel center plate 411, a first parallel connecting plate 412, and a first connection adjustment section 413.

[0051] The first parallel center plate 411 can form the appearance of the central part of the first parallel connecting portion 41. In this embodiment, the first parallel center plate 411 can have the shape of a flat plate perpendicular to the first direction.

[0052] One or more first parallel connecting plates 412 may extend from the first parallel center plate 411 in a second direction parallel to a first direction. In this embodiment, the second direction may mean a direction parallel to the y-axis with reference to Figure 1. That is, the first parallel connecting plates 412 may extend from both sides of the first parallel center plate 411 and have a length along the y-axis. Two first parallel connecting plates 412 may extend from both sides of the first parallel center plate 411 and be connected to the first negative terminal 22. Each first parallel connecting plate 412 may include a first plate 4121 and a second plate 4122. The first plate 4121 may extend from the first parallel center plate 411, and the second plate 4122 may extend from the first plate 4121.

[0053] The first connection adjustment portion 413 is formed on the first parallel connecting plate 412 and its length can be adjusted along the second direction. The first connection adjustment portion 413 may be curved to allow for height adjustment. The first connection adjustment portion 413 can be formed during the molding process of the first parallel connecting plate 412. Alternatively, the first connection adjustment portion 413 can be formed by post-processing after molding of the first parallel connecting plate 412.

[0054] With the first connection adjustment section 413 as the boundary, a first plate 4121 extending from the first parallel center plate 411 may be arranged on one side, and a second plate 4122 may be arranged on the other side. The first connection adjustment section 413 may be formed to be inclined upward from the first plate 4121. As a result, the second plate 4122 may be positioned higher than the first plate 4121. The height of the first plate 4121 can be adjusted by adjusting the inclination angle of the first connection adjustment section 413.

[0055] The first connection adjustment section 413 can form a "U"-shaped bend or a "V"-shaped bend. This bending structure of the first connection adjustment section 413 can be adjusted in height while being deformed by an external force.

[0056] The first parallel extension 42 may include a first parallel side plate 421, a first parallel upper plate 422, and a first side plate adjustment section 423.

[0057] The first parallel side plate 421 may be connected to the first parallel connecting portion 41 and arranged in a first direction. The first parallel side plate 421 may extend upward along the z-axis from the first parallel center plate 411. The length of the first parallel side plate 421 may correspond to the vertical length of the first battery cell 20.

[0058] The first parallel upper plate 422 may extend from the first parallel side plate 421, project in a direction intersecting the first parallel side plate 421, and be positioned above the first battery cell 20. The first parallel upper plate 422 may extend in the x-axis direction from the upper end of the first parallel side plate 421. A portion of the first parallel upper plate 422 may be a welding area.

[0059] The first side plate adjustment portion 423 is formed on one or more of the first parallel side plates 421 and may be curved in shape so as to allow length adjustment along the first direction. The first side plate adjustment portion 423 may be formed on at least one of the upper end and lower end of the first parallel side plate 421.

[0060] The first side plate adjustment section 423 may have a multi-bending shape. That is, the first side plate adjustment section 423 may be formed to have a zigzag shape. The first side plate adjustment section 423 may be bent two to three times.

[0061] The first side plate lower adjustment part 4231, positioned at the lower end of the first parallel side plate 421, has a curved shape that overlaps on the x-axis, thereby allowing the length of the first parallel side plate 421 to be adjusted.

[0062] The first side plate upper adjustment part 4232, positioned at the upper end of the first parallel side plate 421, has a curved shape that overlaps on the z-axis, allowing for adjustment of the length of the first parallel side plate 421 or the height of the first parallel upper plate 422.

[0063] Figure 5 is a schematic diagram of a battery pack according to one embodiment of the present invention, Figure 6 is a schematic front perspective view showing the interior of a battery pack according to one embodiment of the present invention, and Figure 7 is a schematic bottom perspective view showing the interior of a battery pack according to one embodiment of the present invention. Referring to Figures 5 to 7, the battery pack 1 according to one embodiment of the present invention includes a housing 10, a first battery cell 20, a second battery cell 30, a first bus bar 40, a second bus bar 50, and a third bus bar 60.

[0064] The housing 10 may be a container shape with an open top. The housing 10 may be made of resin material. The housing 10 may house a plurality of first battery cells 20 and second battery cells 30. Multiple housings 10 may be arranged in a series.

[0065] Multiple first battery cells 20 can be housed in a housing. Each first battery cell 20 contains a jelly roll-shaped electrode assembly and can form a cylindrical secondary battery having a vertical length in a first direction, i.e., in the z-axis direction. Each first battery cell 20 may be provided with a first positive terminal 21 and a first negative terminal 22. The first positive terminal 21 may be connected to the positive current collector of the electrode assembly, and the first negative terminal 22 may be connected to the negative current collector of the electrode assembly.

[0066] When two first battery cells 20 are arranged adjacent to each other and have a length in a first direction, the first positive terminal 21 may be positioned to face the first direction, and the first negative terminal 22 may be positioned to face the opposite direction. That is, when the first battery cells 20 are upright on the z-axis, the first positive terminal 21 may be positioned at the top, and the first negative terminal 22 may be positioned at the bottom.

[0067] Multiple second battery cells 30 can be housed in a housing. Each second battery cell 30 contains a jelly roll-shaped electrode assembly and can form a cylindrical secondary battery with vertical length in the z-axis direction. Each second battery cell 30 may be provided with a second positive terminal 31 and a second negative terminal 32. The second positive terminal 31 may be connected to the positive current collector of the electrode assembly, and the second negative terminal 32 may be connected to the negative current collector of the electrode assembly.

[0068] When two second battery cells 30 are arranged adjacent to each other and have a length in the first direction, the second negative terminal 32 may be positioned to face the first direction, and the second positive terminal 31 may be positioned to face the opposite direction to the first direction. That is, when the second battery cells 30 are upright on the z-axis, the second negative terminal 32 may be positioned at the top, and the second positive terminal 31 may be positioned at the bottom.

[0069] Using Figure 6 as a reference, multiple first battery cells 20 can be arranged along a second direction intersecting the first direction. Multiple second battery cells 30 can be arranged along a second direction intersecting the first direction. Two first battery cells 20 can be arranged facing each other in the second direction intersecting the first direction, i.e., on the y-axis, and two second battery cells 30 can be arranged facing each other in the second direction intersecting the first direction, i.e., on the y-axis. Two first battery cells 20 and two second battery cells 30 can each be arranged facing each other in a third direction intersecting the second direction, i.e., on the x-axis.

[0070] The first busbar 40 can connect the first negative terminals 22 provided on multiple first battery cells 20. The first busbar 40 can connect a pair of first battery cells 20 in parallel. The first busbar 40 can connect the first negative terminals 22 located at the bottom of each first battery cell 20 in parallel.

[0071] The second busbar 50 can connect the second positive terminals 31 provided on multiple second battery cells 30. The second busbar 50 can connect a pair of second battery cells 30 in parallel. The second busbar 50 can connect the second positive terminals 31 located at the bottom of each second battery cell 30 in parallel.

[0072] The third busbar 60 can connect the first positive terminals 21 provided on multiple first battery cells 20 to the second negative terminals 32 provided on multiple second battery cells 30. The third busbar 60 can connect any one of the two first battery cells 20 to any one of the two second battery cells 30. The third busbar 60 can connect the other one of the two first battery cells 20 to the other one of the two second battery cells 30.

[0073] At least one of the first busbar 40, the second busbar 50, and the third busbar 60 can be deformed in shape depending on the positions of the multiple first battery cells 20 and the multiple second battery cells 30. The first busbar 40, the second busbar 50, and the third busbar 60 may be adjustable in length in the x-axis direction, the y-axis direction, and the z-axis direction, as needed.

[0074] The first busbar 40 may be configured identically to the first busbar 40 described above. For example, the first busbar 40 may include a first parallel connection section 41 and a first parallel extension section 42, as shown in Figures 1 to 4.

[0075] The first parallel connection section 41 can connect two first negative terminals 22 in parallel. The first parallel connection section 41 is located below the two first battery cells 20 and can connect the first negative terminals 22 formed at the bottom of each first battery cell 20 in parallel.

[0076] The first parallel extension 42 may extend upward from the first parallel connection 41. The first parallel extension 42 may be positioned at the same height as the third busbar 60. The first parallel extension 42 may be formed integrally with the first parallel connection 41, and electrical connections may be made on its surface. A portion of the first parallel extension 42 may be electrically connected to a circuit board such as a PCM or BMS.

[0077] The first parallel connection section 41 may include a first parallel center plate 411, a first parallel connecting plate 412, and a first connection adjustment section 413.

[0078] The first parallel center plate 411 may be positioned below a pair of first battery cells 20. The first parallel center plate 411 may be positioned between the first negative terminals 22 provided on each of the first battery cells 20.

[0079] One or more first parallel connecting plates 412 may extend from the first parallel center plate 411 parallel to the second direction and be connected to the first negative terminal 22. That is, the first parallel connecting plates 412 may extend from both sides of the first parallel center plate 411 and have a length along the y-axis. Two first parallel connecting plates 412 may extend from both sides of the first parallel center plate 411 and be connected to the first negative terminal 22. Each first parallel connecting plate 412 may include a first plate 4121 and a second plate 4122. The first plate 4121 may extend from the first parallel center plate 411, and the second plate 4122 may extend from the first plate 4121.

[0080] The first connection adjustment portion 413 is formed on the first parallel connecting plate 412 and its length can be adjusted along the second direction. The first connection adjustment portion 413 may be curved to allow for height adjustment. The first connection adjustment portion 413 can be formed during the molding process of the first parallel connecting plate 412. Alternatively, the first connection adjustment portion 413 can be formed by post-processing after molding of the first parallel connecting plate 412.

[0081] With the first connection adjustment section 413 as the boundary, a first plate 4121 extending from the first parallel center plate 411 may be arranged on one side, and a second plate 4122 connecting to the first battery cell 20 may be arranged on the other side. The first connection adjustment section 413 may be formed to be inclined upward from the first plate 4121. As a result, the second plate 4122 may be positioned higher than the first plate 4121. The height of the first plate 4121 can be adjusted by adjusting the inclination angle of the first connection adjustment section 413.

[0082] The first connection adjustment section 413 can form a "U"-shaped bend or a "V"-shaped bend. This bending structure of the first connection adjustment section 413 allows for height adjustment while being deformed by external force.

[0083] The first parallel extension 42 may include a first parallel side plate 421, a first parallel upper plate 422, and a first side plate adjustment section 423.

[0084] The first parallel side plate 421 is connected to the first parallel connecting portion 41 and may be arranged in the longitudinal direction of the first battery cell 20 alongside the first direction. The first parallel side plate 421 may extend upward along the z-axis from the first parallel center plate 411. The length of the first parallel side plate 421 may correspond to the vertical length of the first battery cell 20. The first parallel side plate 421 may be positioned to face the space between an adjacent pair of first battery cells 20.

[0085] The first parallel upper plate 422 may extend from the first parallel side plate 421, project in a direction intersecting the first parallel side plate 421, and be positioned above the first battery cell 20. The first parallel upper plate 422 may extend in the x-axis direction from the upper end of the first parallel side plate 421. A portion of the first parallel upper plate 422 may be a welding area.

[0086] The first side plate adjustment portion 423 is formed on one or more of the first parallel side plates 421 and may be curved in shape so as to allow length adjustment along the first direction. The first side plate adjustment portion 423 may be formed on at least one of the upper end and lower end of the first parallel side plate 421.

[0087] The first side plate adjustment section 423 may have a multi-bending shape. That is, the first side plate adjustment section 423 may be formed to have a zigzag shape. The first side plate adjustment section 423 may be bent two to three times.

[0088] The first side plate lower adjustment part 4231, positioned at the lower end of the first parallel side plate 421, has a curved shape that overlaps on the x-axis, allowing for adjustment of the length of the first parallel side plate 421 or the distance between the first parallel side plate 421 and the first battery cell 20.

[0089] The first side plate upper adjustment part 4232, positioned at the upper end of the first parallel side plate 421, has a curved shape that overlaps on the z-axis, allowing for adjustment of the length of the first parallel side plate 421 or the height of the first parallel upper plate 422.

[0090] Figure 8 is a schematic diagram showing a second busbar according to one embodiment of the present invention, Figure 9 is a schematic plan view showing a second parallel connection according to one embodiment of the present invention, Figure 10 is a schematic side view showing a second parallel connection according to one embodiment of the present invention, and Figure 11 is a schematic side view showing a second parallel extension according to one embodiment of the present invention. Referring to Figures 6 to 11, the first busbar 40 and the second busbar 50 can be arranged symmetrically to each other.

[0091] The second busbar 50 may include a second parallel connection section 51 and a second parallel extension section 52.

[0092] The second parallel connection section 51 can connect two second positive terminals 31 in parallel. The second parallel connection section 51 is located below the two second battery cells 30 and can connect the second positive terminals 31 formed at the bottom of each second battery cell 30 in parallel.

[0093] The second parallel extension 52 may extend upward from the second parallel connection 51. The second parallel extension 52 may be positioned at the same height as the third busbar 60. The highest point of the second parallel extension 52 and the highest point of the first parallel extension 42 may be the same. The second parallel extension 52 is formed integrally with the second parallel connection 51, and electrical connections may be made on its surface. A portion of the second parallel extension 52 may be electrically connected to a circuit board such as a PCM or BMS.

[0094] The second parallel connection section 51 may include a second parallel center plate 511, a second parallel connecting plate 512, and a second connection adjustment section 513.

[0095] A second parallel center plate 511 may be positioned below a pair of second battery cells 30. The second parallel center plate 511 may be positioned between the second positive terminals 31 provided on each of the second battery cells 30.

[0096] One or more second parallel connecting plates 512 may extend from the second parallel center plate 511 parallel to the second direction and be connected to the second positive terminal 31. That is, the second parallel connecting plates 512 may extend from both sides of the second parallel center plate 511 and have a length along the y-axis. Two second parallel connecting plates 512 may extend from both sides of the second parallel center plate 511 and be connected to the second positive terminal 31. Each second parallel connecting plate 512 may include a third plate 5121 and a fourth plate 5122. The third plate 5121 may extend from the second parallel center plate 511, and the fourth plate 5122 may extend from the third plate 5121.

[0097] The second connection adjustment portion 513 is formed on the second parallel connecting plate 512 and may be curved in shape so that its length and height can be adjusted along the second direction. The second connection adjustment portion 513 may be formed during the molding process of the second parallel connecting plate 512. Alternatively, the second connection adjustment portion 513 may be formed by post-processing after the molding of the second parallel connecting plate 512.

[0098] With the second connection adjustment section 513 as the boundary, a third plate 5121 extending from the second parallel center plate 511 may be arranged on one side, and a fourth plate 5122 connecting to the second battery cell 30 may be arranged on the other side. The second connection adjustment section 513 may be formed to be inclined upward from the third plate 5121. As a result, the fourth plate 5122 may be positioned higher than the third plate 5121. The height of the third plate 5121 can be adjusted by adjusting the inclination angle of the second connection adjustment section 513.

[0099] The second connection adjustment section 513 can form a "U"-shaped bend or a "V"-shaped bend. This bending structure of the second connection adjustment section 513 allows for height adjustment while being deformed by external force.

[0100] The second parallel extension 52 may include a second parallel side plate 521, a second parallel upper plate 522, and a second side plate adjustment section 523.

[0101] The second parallel side plate 521 is connected to the second parallel connecting portion 51 and may be arranged in the longitudinal direction of the second battery cell 30. The second parallel side plate 521 may extend upward along the z-axis from the second parallel center plate 511. The length of the second parallel side plate 521 may correspond to the vertical length of the second battery cell 30. The second parallel side plate 521 may be positioned to face the space between an adjacent pair of second battery cells 30.

[0102] The second parallel upper plate 522 may extend from the second parallel side plate 521 and be positioned above the second battery cell 30. The second parallel upper plate 522 may extend in the x-axis direction from the upper end of the second parallel side plate 521. A portion of the second parallel upper plate 522 may be a welding area.

[0103] The second side plate adjustment portion 523 may be formed on one or more of the second parallel side plates 521 and may have a curved shape to allow length adjustment. The second side plate adjustment portion 523 may be formed on at least one of the upper end and lower end of the second parallel side plate 521.

[0104] The second side plate adjustment section 523 may have a multi-bending shape. That is, the second side plate adjustment section 523 may be formed to have a zigzag shape. The second side plate adjustment section 523 may be bent two to three times.

[0105] The second side plate lower adjustment part 5231, located at the lower end of the second parallel side plate 521, has a curved shape that overlaps on the x-axis, allowing adjustment of the length of the second parallel side plate 521 or the distance between the second parallel side plate 521 and the second battery cell 30.

[0106] The second side plate upper adjustment part 5232, positioned at the upper end of the second parallel side plate 521, has a curved shape that overlaps on the z-axis, allowing for adjustment of the length of the second parallel side plate 521 or the height of the second parallel upper plate 522.

[0107] Figure 12 is a schematic perspective view showing a third busbar according to one embodiment of the present invention, Figure 13 is a schematic plan view showing a third busbar according to one embodiment of the present invention, Figure 14 is a schematic side view showing a third series section according to one embodiment of the present invention, and Figure 15 is a schematic side view showing a third connecting section according to one embodiment of the present invention. Referring to Figures 12 to 15, the third busbar 60 includes a third series section 61, a third connecting section 62, and a third adjustment section 63.

[0108] The pair of third series sections 61 can connect the first positive terminal 21 and the second negative terminal 32 in series. The third series section 61 can connect the upper parts of the first battery cell 20 and the second battery cell 30, which are facing each other on the x-axis, in series.

[0109] The third connecting portion 62 can connect a pair of third series portions 61. The third connecting portion 62 may be positioned between a pair of third series portions 61. The third connecting portion 62 is formed integrally with the third series portions 61, and electrical connections may be made on its surface. A portion of the third connecting portion 62 may be electrically connected to a circuit board such as a PCM or BMS.

[0110] Each third series section 61 may include a third series center plate 611, a third series connecting plate 612, and a third connection adjustment section 613.

[0111] The third series center plate 611 may be positioned above the first battery cell 20 and the second battery cell 30. The third series center plate 611 may be positioned above the space between the first battery cell 20 and the second battery cell 30 that are opposite each other on the x-axis.

[0112] One or more third series connection plates 612 may extend from the third series center plate to both sides and be connected to the first positive terminal 21 and the second negative terminal 32, respectively. Two third series connection plates 612 may be spaced apart on each side of the third series center plate 611. Two third series connection plates 612 extending from the third series center plate 611 in the direction opposite to the third direction may be connected to the first positive terminal 21 of the first battery cell 20. Two third series connection plates 612 extending from the third series center plate 611 in the third direction may be connected to the second negative terminal 32 of the second battery cell 30.

[0113] The third connection adjustment portion 613 is formed on the third series connecting plate 612 and may be curved to allow for height adjustment. The third connection adjustment portion 613 can be formed during the molding process of the third series connecting plate 612. Alternatively, the third connection adjustment portion 613 can be formed by post-processing after the molding of the third series connecting plate 612.

[0114] The third series connection plate 612 may include a first connection plate 6121 and a second connection plate 6122. With the third connection adjustment section 613 as a boundary, the first connection plate 6121 extending from the third series center plate 611 may be located on one side, and the second connection plate 6122 connecting to the first battery cell 20 or the second battery cell 30 may be located on the other side. The third connection adjustment section 613 may be formed to incline downward from the first connection plate 6121. Thereafter, the second connection plate 6122 may be positioned lower than the first connection plate 6121. The height of the first connection plate 6121 can be adjusted by adjusting the inclination angle of the third connection adjustment section 613.

[0115] The third adjustment portion 63 may be formed on the third connecting portion 62, one or more of them, and may be curved to allow for height adjustment. The third adjustment portion 63 may be located on both ends of the third connecting portion 62. That is, the third adjustment portion 63 may be located at the ends of the third connecting portion 62 that are connected to the third series portion 61. The upper surface of the third connecting portion 62 located between a pair of third adjustment portions 63 may later become a welding target area.

[0116] The third adjustment part 63 can be formed during the molding process of the third connecting part 62. Alternatively, the third adjustment part 63 can be formed by post-processing after the molding of the third connecting part 62. The third adjustment part 63 can form a "U" shaped bend or a "V" shaped bend. Such a bending structure of the third adjustment part 63 allows for height adjustment while being deformed by external force.

[0117] Figure 16 is a schematic perspective view showing a block according to one embodiment of the present invention. Referring to Figures 2, 3 and 16, the battery pack 1 according to one embodiment of the present invention may further include a block 70. The block 70 can support a plurality of first battery cells 20 and a plurality of second battery cells 30 so as to partition them.

[0118] Block 70 is molded from a resin material, and the first battery cell 20 and the second battery cell 30 can be separated by the block 70. One block 70 may contain two first battery cells 20 and two second battery cells 30.

[0119] Block 70 may include a first block 71, a second block 72, and a third block 73.

[0120] The first block 71 may have height in a first direction and length in a third direction intersecting the first direction. The third direction may be the x-axis in Figure 1. The second block 72 may have height in a first direction and length in a second direction intersecting the third direction. The second direction may be the y-axis in Figure 1.

[0121] The first block 71 and the second block 72 may be cross-shaped and have the same length. The first block 71 and the second block 72 can divide the space into a first space 711, a second space 712, a third space 713, and a fourth space 714.

[0122] The third block 73 is formed between the first block 71 and the second block 72 and can accommodate a plurality of first battery cells 20 and second battery cells 30, respectively. The third block 73 is formed integrally with the first block 71 and the second block 72 and may protrude into the first space 711, the second space 712, the third space 713, and the fourth space 714. The third block 73 may have curved surfaces that correspond to the surfaces of the first battery cells 20 and the second battery cells 30.

[0123] Figure 17 is a diagram of Figure 1 with an elastic member added according to one embodiment of the present invention. Referring to Figure 17, the battery pack 1 according to one embodiment of the present invention may further include an elastic member 80. The elastic member 80 is provided in the housing 10 and supports the first battery cell 20 and the second battery cell 30, and is capable of height compensation.

[0124] The elastic member 80 may include rubber or foam material. When the pressure exceeds a set pressure, the elastic member 80 may contract to eliminate the height difference between the first battery cell 20 and the second battery cell 30.

[0125] The elastic member 80 can be attached to or bonded to the upper surface of the bottom 11 of the housing 10. The two first battery cells 20 and the two second battery cells 30 can be fixed to the elastic member 80. At this time, an external force can be applied to at least one of the first battery cells 20 and the second battery cells 30 to guide them so that their upper heights become the same. In other words, the elastic member 80 can compensate for the z-axis position of the first battery cells 20 and the second battery cells 30.

[0126] Figure 18 is a diagram of Figure 1 with an additional connecting body according to one embodiment of the present invention, Figure 19 is a schematic perspective view showing the state of the connecting body according to one embodiment of the present invention before welding, and Figure 20 is a schematic cross-sectional view showing the welded state of the connecting body according to one embodiment of the present invention. Referring to Figures 18 to 20, the battery pack 1 according to one embodiment of the present invention may further include a connecting body 90.

[0127] The connecting body 90 can be fixedly attached to the first busbar 40, the second busbar 50, and the third busbar 60 by laser welding. At this time, since the high points of the first busbar 40, the second busbar 50, and the third busbar 60 are the same, laser welding can be performed simultaneously.

[0128] The connector 90 may be a circuit board such as a PCM or BMS. The connector 90 may include a connector board 91 and a connector tap 92.

[0129] The connecting substrate 91 includes various circuits and may have substrate holes 910 formed for laser welding. The substrate holes 910 may include a pair of adjacent first holes 911 and a second hole 912 positioned between the first holes 911. The connecting tap 92 can be mounted on the connecting substrate 91 and laser-welded after contacting the first busbar 40, the second busbar 50, and the third busbar 60.

[0130] The connecting tap 92 is mounted on the connecting substrate 91 and can be laser-welded to the first busbar 40, the second busbar 50, and the third busbar 60, respectively. The connecting tap 92 may include a first tap 921 covering the first hole 911 and a second tap 922 covering the second hole 912. The first tap 921 may contact the first parallel extension 42 of the first busbar 40 and the second parallel extension 52 of the second busbar 50. The second tap 922 may contact the third connecting portion 62 of the third busbar 60.

[0131] With two first battery cells 20 and two second battery cells 30 partitioned and supported in block 70, the first busbar 40 connects the first negative terminals 22 located at the bottom of the first battery cells 20 in parallel, and the second busbar 50 connects the second positive terminals 31 located at the bottom of the second battery cells 30 in parallel. The third busbar 60 connects the first positive terminal 21 located at the top of the first battery cell 20 and the second negative terminals 32 located at the top of the second battery cells 30 in series. At this time, the third connecting portion 62 of the third busbar 60 is positioned between the first parallel extension portion 42 of the first busbar 40 and the second parallel extension portion 52 of the second busbar 50.

[0132] The first busbar 40, the second busbar 50, and the third busbar 60 each have one or more bending regions that allow for displacement adjustment. As a result, the displacement is adjusted so that the upper surfaces of the first parallel extension 42, the second parallel extension 52, and the third connecting portion 62 are aligned on the same line.

[0133] When the heights of the first parallel extension 42, the second parallel extension 52, and the third connecting portion 62 are aligned, the connecting tap 92 mounted on the connecting substrate 91 makes surface contact with the first parallel extension 42, the second parallel extension 52, and the third connecting portion 62, respectively.

[0134] When the connecting tap 92 makes surface contact with the first parallel extension 42, the second parallel extension 52, and the third connecting portion 62, respectively, the welding and joining process can be performed simultaneously or sequentially by laser welding.

[0135] In an embodiment of the present invention, the battery pack 1 includes a first bus bar 40 connecting a plurality of first battery cells 20 in parallel, a second bus bar 50 connecting a plurality of second battery cells 30 in parallel, and a third bus bar 60 connecting the first battery cells 20 and the second battery cells 30 in series, and by adjusting the displacement, the upper heights of the first bus bar 40, the second bus bar 50, and the third bus bar 60 can be made to match, thereby improving the workability of subsequent processes.

[0136] In the battery pack 1 according to an embodiment of the present invention, when the flatness of the first bus bar 40, the second bus bar 50, and the third bus bar 60 matches, even when the connector 90 is fixed to them in an automated process, the contact between the connector 90 and the first bus bar 40, the second bus bar 50, and the third bus bar 60 is stably maintained, so that laser welding can be performed without additional steps to maintain the contact state.

[0137] Although the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely illustrative, and a person with ordinary skill in the art will understand that a variety of modifications and equivalent other embodiments are possible therefrom. Therefore, the scope of technical protection of the present invention should be determined by the following claims. [Explanation of Symbols]

[0138] 10: Housing 11: Bottom 20: First battery cell 21: First positive terminal 22: First negative terminal 30: Second battery cell 31: Second positive terminal 32: Second negative terminal 40: First bus bar 41: First parallel connection section 42: First parallel extension 50: Second bus bar 51: Second parallel connection section 52: Second parallel extension 60: Third bus bar 61: Third series section 62: Third connecting section 63: Third adjustment section 70: Block 71: Block 1 72: Second block 73: Third Block 80: Elastic member 90: Connector 91: Connecting board 92: Connecting Tap 411: First parallel center plate 412: First parallel connection board 413: First connection adjustment section 421: First parallel side plate 422: First parallel upper plate 423: First side panel adjustment section 4121: First board 4122: Second board 4231: Lower adjustment part of the first side panel 4232: Upper adjustment part of the first side panel 511: Second parallel center plate 512: Second parallel connection board 513: Second connection adjustment section 521: Second parallel side plate 522: Second parallel upper plate 523: Second side panel adjustment section 5121: Third board 5122: The 4th board 5231: Lower adjustment part of the second side panel 5232: Second side panel upper adjustment section 611: Third series center plate 612: Third series connection board 613: Third connection adjustment section 6121: First connecting plate 6122: Second connecting plate 711: The first space 712: The Second Space 713: The Third Space 714: The Fourth Space 910: Circuit board hole 911: Hall 1 912: Second Hall 921: First tap 922: Second tap

Claims

1. The first parallel connection section, It includes a first parallel extension extending in a first direction from the first parallel connection, The first parallel connection section is, The first parallel center plate, A first parallel connecting plate extending from the first parallel center plate in a direction parallel to a second direction intersecting the first direction, A busbar characterized by including a first connection adjustment portion formed on the first parallel connection plate and provided to be length-adjustable along the second direction.

2. The bus bar according to claim 1, characterized in that the first connection adjustment portion forms a "U" shape or a "V" shape bend.

3. The first parallel extension is, A first parallel side plate connected to the first parallel connecting section and arranged in the same direction as the first, A first parallel upper plate extends from the first parallel side plate and is arranged to intersect with the first parallel side plate, The bus bar according to claim 1, further comprising: a first side plate adjustment portion formed on the first parallel side plate and provided to be length-adjustable along the first direction.

4. The bus bar according to claim 3, characterized in that the first side plate adjustment portion is bent in a zigzag shape.

5. Housing and The housing contains a plurality of first battery cells, each having a first positive terminal and a first negative terminal. The housing contains a plurality of second battery cells, each having a second positive terminal and a second negative terminal. A first busbar connecting the first negative terminals of a plurality of the first battery cells, A second busbar connecting the second positive terminals of multiple second battery cells, The battery cell includes a first positive terminal of the first battery cell and a third busbar connecting the second negative terminal of the second battery cell, A battery pack characterized in that at least one of the first busbar, the second busbar, and the third busbar is deformable in shape depending on the positions of the first battery cell and the second battery cell.

6. The first positive terminal and the second negative terminal are arranged to face the first direction. The battery pack according to claim 5, characterized in that the first negative terminal and the second positive terminal are arranged to face in the opposite direction to the first direction.

7. The first busbar is, A first parallel connection section that connects adjacent first negative terminals in parallel, The battery pack according to claim 6, characterized by including a first parallel extension portion extending from the first parallel connection portion in the first direction.

8. Multiple of the first battery cells are arranged in a row along a second direction intersecting the first direction. The first parallel connection section is, The first parallel center plate, A first parallel connecting plate extends from the first parallel center plate parallel to the second direction and connects to the first negative terminal, The battery pack according to claim 7, further comprising: a first connection adjustment portion formed on the first parallel connection plate and provided to be length-adjustable along the second direction.

9. The battery pack according to claim 8, characterized in that the first connection adjustment portion forms a "U" shape or a "V" shape bend.

10. The first parallel extension is, A first parallel side plate connected to the first parallel connecting section and arranged in the same direction as the first, A first parallel upper plate extends from the first parallel side plate and is arranged to intersect with the first parallel side plate, The battery pack according to claim 8, further comprising: a first side plate adjustment portion formed on the first parallel side plate and provided to be length-adjustable along the first direction.

11. The battery pack according to claim 10, characterized in that the first side plate adjustment portion is bent in a zigzag shape.

12. The second busbar is, A second parallel connection section that connects adjacent first positive terminals in parallel, The battery pack according to claim 6, characterized by including a second parallel extension portion extending from the second parallel connection portion in the first direction.

13. Multiple of the second battery cells are arranged in a row along a second direction intersecting the first direction. The second parallel connection section is, The second parallel center plate, A second parallel connecting plate extends from the second parallel center plate parallel to the second direction and connects to the second positive terminal, The battery pack according to claim 12, characterized in that it includes a second connection adjustment portion formed on the second parallel connection plate and provided to be length-adjustable along the second direction.

14. The battery pack according to claim 13, characterized in that the second connection adjustment portion can form a "U" shape or a "V" shape bend.

15. The second parallel extension mentioned above is, A second parallel side plate connected to the second parallel connecting section and arranged in the same direction as the first, A second parallel upper plate extends from the second parallel side plate and is positioned to intersect with the second parallel side plate, The battery pack according to claim 12, further comprising: a second side plate adjustment portion formed on the second parallel side plate and provided to be length-adjustable along the first direction.

16. The battery pack according to claim 15, characterized in that the second side plate adjustment portion is bent in a zigzag shape.

17. The third busbar is, A plurality of third series sections connecting the first positive terminal and the second negative terminal in series, A third connecting section that connects a plurality of the aforementioned third series sections, The battery pack according to claim 6, further comprising: one or more third adjusting portions formed on the third connecting portion, which are provided to be length-adjustable along a second direction intersecting the first direction.

18. The first battery cell and the second battery cell are arranged to face each other along a third direction intersecting the first and second directions. The third series section is, The third series center plate, A third series connecting plate extends from the third series center plate in a direction parallel to the third direction and connects to the first positive terminal and the second negative terminal, respectively. The battery pack according to claim 17, further comprising: a third connection adjustment portion formed on the third series connection plate and provided to be length-adjustable along the third direction.

19. The battery pack according to claim 17, characterized in that the third adjustment portion forms a "U" shape or a "V" shape bend.

20. The battery pack according to claim 5, further comprising an elastic member provided in the housing that supports a plurality of the first battery cells and a plurality of the second battery cells and is capable of compensating for height.

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