Battery pack and vehicle comprising same

Abstract

The present invention provides a battery pack having an enhanced service life by improving current deviation. The battery pack according to an embodiment of the present invention comprises: multiple battery cells; and a bus bar assembly electrically connected to the multiple battery cells at one side of each of the multiple battery cells and formed to have at least one of a predetermined width and a predetermined angle to achieve uniform current distribution among the multiple battery cells.

Description

Battery pack and automobile including the same

[0001] The present invention relates to a battery pack and an automobile including the same, and more specifically, to a battery pack with an improved lifespan by improving current deviation and an automobile including the same.

[0002] This application is a priority claim application for Korean Patent Application No. 10-2024-0125116 filed on September 12, 2024, and all contents disclosed in the specification and drawings of said application are incorporated into this application by reference.

[0003] Secondary batteries, which possess electrical characteristics such as high energy density and high applicability across product groups, are widely applied not only to portable devices but also to electric vehicles (EVs) or hybrid electric vehicles (HEVs) powered by electric sources. These secondary batteries are attracting attention as a new energy source for enhancing eco-friendliness and energy efficiency, not only for the primary advantage of drastically reducing the use of fossil fuels but also because they generate no by-products from energy use.

[0004] Currently, widely used types of secondary batteries include lithium-ion batteries, lithium-polymer batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and nickel-zinc batteries. The operating voltage of these unit secondary battery cells, or unit battery cells, is approximately 2.5V to 4.5V. Therefore, if a higher output voltage is required, multiple battery cells are connected in series to form a battery pack. Additionally, depending on the charge / discharge capacity required for the battery pack, multiple battery cells are connected in parallel to form a battery pack. Accordingly, the number of battery cells included in the battery pack can be varied depending on the required output voltage or charge / discharge capacity.

[0005] Meanwhile, when configuring a battery pack by connecting multiple battery cells in series or parallel, it is common practice to first configure a battery module containing at least one battery cell, and then use this at least one battery module to add other components to form the battery pack.

[0006] Recently, medium-to-large battery packs used in electric vehicles and the like are configured to include a large number of battery cells to increase output and / or capacity, and these multiple battery cells are electrically connected through a busbar assembly. When multiple battery cells are electrically connected via a busbar assembly, if current deviations occur depending on the configuration of the current path, current is concentrated on specific battery cells, resulting in a rapid decrease in the battery pack's lifespan. To prevent this, it is necessary to design a busbar assembly that minimizes current deviations during the electrical connection of multiple battery cells and enables uniform current distribution among the battery cells.

[0007] Therefore, it is necessary to explore ways to improve the lifespan of a battery pack by configuring a busbar assembly that can minimize current deviations among battery cells when electrically connecting multiple battery cells.

[0008] Accordingly, the object of the present invention is to provide a battery pack having a busbar assembly capable of minimizing current deviation of battery cells and an automobile including the same.

[0009] In addition, another objective of the present invention is to provide a battery pack capable of extending the lifespan of battery cells and reducing temperature variations, and a vehicle including the same.

[0010] In addition, another objective of the present invention is to provide a battery pack capable of increasing the capacity of the available battery pack and improving the lifespan of the battery pack, and a vehicle including the same.

[0011] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems will be clearly understood by those skilled in the art from the description of the invention below.

[0012] To solve the above objective, the present invention provides a battery pack comprising: a plurality of battery cells; and a busbar assembly electrically connected to the plurality of battery cells on one side thereof and formed to have at least one of a predetermined width and a predetermined angle so as to enable uniform current distribution among the plurality of battery cells.

[0013] Additionally, preferably, the busbar assembly comprises a bidirectional connection busbar connected to the electrodes of the battery cells on each side in the width direction of the busbar assembly; and a unidirectional connection busbar connected to the electrodes of the battery cells on one side in the width direction of the busbar assembly, wherein the bidirectional connection busbar may be configured to have at least one of the predetermined width and the predetermined angle to evenly distribute current to each battery cell side connected on both sides in the width direction of the busbar assembly.

[0014] Additionally, preferably, the bidirectional connection busbar comprises: a busbar body formed with a predetermined length along the longitudinal direction of the busbar assembly; a plurality of first electrode connection portions formed on the busbar body and spaced apart from each other by a predetermined distance along the longitudinal direction of the busbar assembly; and a plurality of second electrode connection portions formed on the busbar body and spaced apart from each other by a predetermined distance along the longitudinal direction of the busbar assembly, wherein each first electrode connection portion and each second electrode connection portion may be connected to the busbar body with a predetermined spacing so as to evenly distribute the current between the first electrode connection portion and the second electrode connection portion.

[0015] Additionally, preferably, the busbar body may have the predetermined width in the width direction of the busbar assembly.

[0016] In addition, preferably, the predetermined width may be 10 mm.

[0017] Additionally, preferably, at least one of the plurality of first electrode connection portions and the plurality of second electrode connection portions may be formed inclined at the predetermined angle from the busbar body.

[0018] Additionally, preferably, the predetermined angle may be 30 degrees.

[0019] Additionally, preferably, the plurality of first electrode connection portions and the plurality of second electrode connection portions may be formed at the same angle of inclination from the busbar body.

[0020] Additionally, preferably, the plurality of first electrode connection parts and the plurality of second electrode connection parts may be arranged in a straight line with respect to each other with the busbar body in between.

[0021] Additionally, preferably, the plurality of first electrode connection parts and the plurality of second electrode connection parts may be arranged diagonally from each other with the busbar body in between.

[0022] Additionally, preferably, the plurality of first electrode connection portions may be formed in a row on the busbar body.

[0023] Additionally, preferably, the plurality of second electrode connection portions may be formed at an angle inclined from the plurality of first electrode connection portions.

[0024] Additionally, preferably, a bending structure may be formed in at least one of the plurality of first electrode connection parts and the plurality of second electrode connection parts.

[0025] Additionally, preferably, the plurality of first electrode connection portions may be formed by bending once from the busbar body.

[0026] Additionally, preferably, the bending angle of the bending structure may be 90 degrees.

[0027] And, the present invention provides a vehicle characterized by including at least one battery pack according to the above-described embodiments.

[0028] According to various embodiments as described above, a battery pack having a busbar assembly capable of minimizing current deviation of battery cells and an automobile including the same can be provided.

[0029] In addition, according to various embodiments as described above, a battery pack capable of extending the lifespan of battery cells and reducing temperature variations, and an automobile including the same can be provided.

[0030] In addition, according to the various embodiments described above, a battery pack capable of increasing the capacity of the available battery pack and improving the lifespan of the battery pack, and a vehicle including the same can be provided.

[0031] In addition, various other additional effects may be achieved by various embodiments of the present invention. These various effects of the present invention are described in detail in each embodiment, or the description of effects that are easily understood by those skilled in the art is omitted.

[0032] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0033] FIG. 1 is a drawing for explaining a battery pack according to one embodiment of the present invention.

[0034] Figure 2 is a schematic plan view of the main part of the battery pack of Figure 1.

[0035] Figure 3 is a drawing for explaining the bidirectional connection busbar of the busbar assembly of the battery pack of Figure 2.

[0036] Figure 4 is a diagram illustrating the improvement of current deviation through the bidirectional connection busbar of Figure 3.

[0037] FIG. 5 is a drawing for explaining a busbar assembly according to another embodiment of the present invention.

[0038] FIG. 6 is a drawing for explaining the bidirectional connection busbar of the busbar assembly of FIG. 2.

[0039] Figure 7 is a diagram illustrating the improvement of current deviation through the bidirectional connection busbar of Figure 6.

[0040] FIG. 8 is a drawing for illustrating a busbar assembly according to another embodiment of the present invention.

[0041] FIG. 9 is a drawing for explaining the bidirectional connection busbar of the busbar assembly of FIG. 8.

[0042] Figure 10 is a diagram illustrating the improvement of current deviation through the bidirectional connection busbar of Figure 9.

[0043] FIG. 11 is a drawing for illustrating a busbar assembly according to another embodiment of the present invention.

[0044] FIG. 12 is a drawing for explaining the bidirectional connection busbar of the busbar assembly of FIG. 11.

[0045] Figure 13 is a diagram illustrating the improvement of current deviation through the bidirectional connection busbar of Figure 12.

[0046] FIG. 14 is a drawing for illustrating a busbar assembly according to another embodiment of the present invention.

[0047] FIG. 15 is a drawing for explaining the bidirectional connection busbar of the busbar assembly of FIG. 14.

[0048] Figure 16 is a diagram illustrating the improvement of current deviation through the bidirectional connection busbar of Figure 15.

[0049] FIG. 17 is a drawing for illustrating a busbar assembly according to another embodiment of the present invention.

[0050] FIG. 18 is a drawing for explaining the bidirectional connection busbar of the busbar assembly of FIG. 17.

[0051] Figure 19 is a diagram illustrating the improvement of current deviation through the bidirectional connection busbar of Figure 18.

[0052] FIG. 20 is a drawing for illustrating a busbar assembly according to another embodiment of the present invention.

[0053] FIG. 21 is a drawing for explaining the bidirectional connection busbar of the busbar assembly of FIG. 20.

[0054] Figure 22 is a diagram illustrating the improvement of current deviation through the bidirectional connection busbar of Figure 21.

[0055] FIG. 23 is a drawing for explaining an automobile according to one embodiment of the present invention.

[0056] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, and should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0057] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0058] Meanwhile, although terms indicating directions such as up, down, left, right, front, and back may be used in this specification, these terms are used merely for convenience of explanation and may vary depending on the location of the object or the position of the observer, it is obvious to those skilled in the art of this invention.

[0059]

[0060] FIG. 1 is a drawing for explaining a battery pack according to an embodiment of the present invention, FIG. 2 is a schematic plan view of the main part of the battery pack of FIG. 1, FIG. 3 is a drawing for explaining a bidirectional connection busbar of the busbar assembly of the battery pack of FIG. 2, and FIG. 4 is a drawing for explaining the improvement of current deviation through the bidirectional connection busbar of FIG. 3.

[0061] Referring to FIGS. 1 to 4, the battery pack (1) may include a plurality of battery cells (10) and a busbar assembly (50).

[0062] The plurality of battery cells (10) above may be provided as secondary batteries, such as cylindrical secondary batteries, pouch-type secondary batteries, or prismatic secondary batteries. Hereinafter, in this embodiment, the description is limited to the plurality of battery cells (10) being provided as cylindrical secondary batteries.

[0063] The busbar assembly (50) is for electrically connecting the plurality of battery cells (10) and may be positioned on one side of the plurality of battery cells (10). Specifically, the busbar assembly (50) may be positioned on the upper side (+Z-axis direction) of the plurality of battery cells (10) so as to be electrically connected to the plurality of battery cells (10) in one direction.

[0064] The busbar assembly (50) may be formed to have at least one of a predetermined width and a predetermined angle so as to distribute the current of the plurality of battery cells (10) uniformly. The busbar assembly (50) is connected to the electrodes (12, 14) of the plurality of battery cells (10) for electrical connection, and can minimize the current deviation of the plurality of battery cells (10) by distributing the current of the plurality of battery cells (10) uniformly.

[0065] In the case of electrical connection of multiple battery cells (10) through the above busbar assembly (50), current may be skewed toward a specific battery cell (10) among the multiple battery cells (10). When current deviation occurs among the multiple battery cells (10) due to this current skew, there is a problem that the lifespan of the battery pack (1) is rapidly reduced.

[0066] The busbar assembly (50) according to the present embodiment is formed to have at least one of a predetermined width and a predetermined angle that can uniformly guide the current distribution of the plurality of battery cells (10), thereby minimizing the current deviation of the plurality of battery cells (10).

[0067] Accordingly, in this embodiment, when electrically connecting the plurality of battery cells (10) and the busbar assembly (50), the current deviation of the plurality of battery cells (10) can be minimized, thereby extending the lifespan of the battery cells (10) and thereby extending the lifespan of the battery pack (1).

[0068] In addition, in this embodiment, the capacity of the battery pack (1) that can be used can also be secured through the improvement of the current deviation.

[0069] In addition, in this embodiment, the temperature difference between the plurality of battery cells (10) can also be reduced through the improvement of the current difference.

[0070]

[0071] Below, the busbar assembly (50) according to this embodiment will be examined in more detail.

[0072] The above busbar assembly (50) may include a bidirectional connection busbar (100) and a unidirectional connection busbar (900).

[0073] The above bidirectional connection busbar (100) may be provided in multiple numbers. The multiple bidirectional connection busbars (100) may be spaced apart from each other by a predetermined distance in the width direction (Y-axis direction) of the busbar assembly (50). In addition, the multiple bidirectional connection busbars (100) may be spaced apart from each other by a predetermined distance in the length direction (X-axis direction) of the busbar assembly (50). These multiple bidirectional connection busbars (100) may be placed between the unidirectional connection busbars (900) described later in the width direction (Y-axis direction) of the busbar assembly (50).

[0074] The above unidirectional connection busbar (900) may be provided in multiple numbers. The multiple unidirectional connection busbars (900) may be arranged on both outermost sides (+Y-axis and -Y-axis directions) in the width direction (Y-axis direction) of the battery cells (10). In addition, the multiple unidirectional connection busbars (900) may be spaced apart from each other by a predetermined distance in the length direction (X-axis direction) of the busbar assembly (50).

[0075] The above unidirectional connection busbar (900) can be connected to the electrodes (12, 14) of the battery cells on one side (+Y-axis direction or -Y-axis direction) in the width direction (Y-axis direction) of the busbar assembly. The above unidirectional connection busbar (900) can be connected to the electrode (12, 14) of the same polarity among the electrodes (12, 14) of the battery cells on one side (+Y-axis direction or -Y-axis direction) in the width direction (Y-axis direction) of the busbar assembly.

[0076] The bidirectional connection busbar (100) can be connected to the electrodes (12, 14) of the battery cells (10) on both sides (+Y-axis direction and -Y-axis direction) in the width direction (Y-axis direction) of the busbar assembly (50). The bidirectional connection busbar (100) can be connected to both electrodes (12, 14) having different polarities of the battery cells (10) on both sides (+Y-axis direction and -Y-axis direction) in the width direction (Y-axis direction) of the busbar assembly (50). Specifically, the bidirectional connection busbar (100) can be connected to the electrodes (12) of a plurality of battery cells (10) having the same polarity on one side (+Y-axis direction) in the width direction. And, the bidirectional connection busbar (100) can be connected to the electrodes (14) of a plurality of battery cells (10) having the same polarity as the electrodes (12) of a plurality of battery cells (10) on the other side of the width direction (-Y-axis direction) having opposite polarity to the electrodes (12) of a plurality of battery cells (10) on the one side of the width direction (+Y-axis direction).

[0077] Since the bidirectional connection busbar (100) is connected to all electrodes (12, 14) having different polarities of the battery cells (10), there may be a relatively high possibility of current deviation occurring between the battery cells (10). In this embodiment, the bidirectional connection busbar (100) may be configured to have at least one of the predetermined width and the predetermined angle to evenly distribute current to each battery cell (10) connected on both sides in the width direction (Y-axis direction) of the busbar assembly.

[0078]

[0079] Below, we will examine the above-mentioned bidirectional connection busbar (100) in more detail.

[0080] The above bidirectional connection busbar (100) may include a busbar body (110), a plurality of first electrode connection parts (130), and a plurality of second electrode connection parts (150).

[0081] The busbar body (110) may be formed to a predetermined length along the longitudinal direction (X-axis direction) of the busbar assembly (50). This busbar body (100) may be made of a metal material.

[0082] The plurality of first electrode connection portions (130) may be formed on one side (+Y-axis direction) in the width direction (Y-axis direction) of the busbar body (110). These plurality of first electrode connection portions (130) may be integrally formed with the busbar body (110). The plurality of first electrode connection portions (130) may be spaced apart from each other by a predetermined distance along the length direction (X-axis direction) of the busbar assembly (50).

[0083] The plurality of first electrode connection portions (130) can be connected to a first electrode (12) having a first polarity among the electrodes (12, 14) of the battery cells (10). Here, the first electrode (12) having the first polarity of the battery cells (10) may be a positive electrode (12).

[0084] The plurality of second electrode connection parts (150) may be formed on the other side (-Y-axis direction) of the width direction (Y-axis direction) of the busbar body (110). These plurality of second electrode connection parts (150) may be formed integrally with the busbar body (110). The plurality of second electrode connection parts (150) may be spaced apart from each other by a predetermined distance along the length direction (X-axis direction) of the busbar assembly (50), and may be arranged alternately with the plurality of first electrode connection parts (130) along the length direction (axis direction) of the busbar assembly (50). In other words, the plurality of first electrode connection parts (130) and the plurality of second electrode connection parts (150) may be arranged in a zigzag shape along the length direction (X-axis direction) of the busbar body (110).

[0085] The plurality of second electrode connection parts (150) may be connected to the electrodes (14) of the battery cells (10) having opposite polarity to the plurality of first electrode connection parts (130). For example, the plurality of second electrode connection parts (150) may be connected to the second electrode (14) having a second polarity among the electrodes (12, 14) of the battery cells (10). Here, the second electrode (14) having the second polarity of the battery cells (10) may be a negative electrode (14). Meanwhile, the battery cells (10) may include an insulating gasket for electrical insulation between the first electrode (12) and the second electrode (14).

[0086] Each first electrode connection part (130) and each second electrode connection part (150) can be integrally connected to the busbar body (110) so that the current between the first electrode connection part (130) and the second electrode connection part (150) is evenly distributed. To this end, each first electrode connection part (130) and each second electrode connection part (150) can be arranged to have a predetermined spacing distance on the busbar body (110) so as to minimize current deviation due to a zigzag shape structure.

[0087] The busbar body (110) may have a predetermined width (w) in the width direction (Y-axis direction) of the busbar assembly (50). The predetermined width (w) may be the predetermined width of the aforementioned busbar assembly (50). Specifically, the predetermined width (w) may be the predetermined width of the aforementioned bidirectional connection busbar (100). That is, the predetermined width (w) may be a thickness for minimizing the current deviation.

[0088] In this embodiment, the resistance of the bidirectional connection busbar (100) can be reduced by securing the area of ​​the busbar body (110) through the busbar body (110) having the predetermined width (w). Through this reduction in resistance, the current deviation of the bidirectional connection busbar (100) can be minimized. Specifically, the predetermined width (w) of the busbar body (110) may be approximately 10 mm.

[0089] Hereinafter, with further reference to FIG. 4, FIG. 1 to FIG. 3, and the following [Table 1] to [Table 4], we will examine in more detail the structure for improving current deviation according to a predetermined width of the busbar assembly (50) in the battery pack (1).

[0090] First, the bidirectional connecting busbar (30) of the conventional busbar assembly disclosed in FIG. 4(a) may include a busbar body (33), a plurality of first connecting busbars (34) provided on one side (+Y-axis direction) of the busbar body (33), and a plurality of second connecting busbars (35) provided on the other side (-Y-axis direction) of the busbar body (33). Here, the conventional busbar body (33) may have a width (d) of approximately 7 mm.

[0091] Table 1 below discloses the applied current per cell, maximum current per cell, minimum current per cell, and coefficient of variation in the busbar assembly structure of a conventional battery pack. In addition, the values ​​of the applied current per cell, maximum current per cell, minimum current per cell, and coefficient of variation in the busbar assembly structure of a conventional battery pack in Table 1 below were calculated from measurements of 16 battery cells, such as the arrangement structure of battery cells disclosed in FIG. 2.

[0092] Applied current / Cell [A]Max current / Cell [A]Min current / Cell [A]Coefficient of variation (standard deviation / average) [%]32.036.1:Cell #13_21(+12.7%)27.9:Cell #14_21(-12.8%)7.44

[0093] Table 2 below discloses current values ​​measured in a busbar assembly structure of a conventional battery pack. Specifically, Table 2 below discloses current values ​​of battery cells in an array structure such as the array structure of 16 battery cells disclosed in FIG. 2, as described later in Tables 3 and 4.

[0094] _24_23_22_21Cell#1233.7932.5931.4929.81Cell#1327.9831.1733.4636.05Cell#1435.8833.3231.1027.92Cell#1529.4431.9033.0434.29

[0095] In the above [Table 2], reference numerals Cell#12 to Cell#14 represent the vertical axis (Y-axis direction), and reference numerals _25 to _21 represent the horizontal axis (X-axis direction). Specifically, in the above [Table 2], reference numeral Cell#12 represents a line of battery cells (10) arranged along the horizontal direction (X-axis direction) from the top (-Y-axis direction) of the vertical direction (Y-axis direction) of FIG. 2, and reference numerals Cell#13 to Cell#14 represent lines of battery cells (10) arranged sequentially below (+Y-axis direction) the line of battery cells (10) of Cell#12 in the vertical direction (Y-axis direction), and each may represent a line of battery cells (10) arranged along the horizontal direction (X-axis direction). And, reference numeral _24 represents a line of battery cells (10) arranged in a zigzag shape along the vertical direction (Y-axis direction) from the leftmost (-X-axis direction) in the horizontal direction (X-axis direction) of FIG. 2, and reference numerals _23 to _21 represent lines of battery cells (10) arranged sequentially from the horizontal direction (X-axis direction) to the right (+X-axis direction), and may represent a line of battery cells (10) arranged in a zigzag shape along the vertical direction (Y-axis direction).

[0096] For example, in Table 2 above, Cell#12_24 may refer to a battery cell (10) placed at the left end from the uppermost side in the vertical direction (Y-axis direction) of FIG. 2, and Cell#12_21 may refer to a battery cell (10) placed at the right end from the uppermost side in the vertical direction (Y-axis direction) of FIG. 2. In Table 2 above, Cell#15_23 may refer to the battery cell (10) positioned second from the left end among the battery cells (10) in the line of battery cells (10) positioned at the bottom side in the vertical direction (Y-axis direction) of FIG. 2, Cell#15_22 may refer to the battery cell (10) positioned third from the left end, and Cell#15_21 may refer to the battery cell (10) positioned fourth from the left end, that is, the battery cell (10) positioned at the right end from the bottom side in the vertical direction (Y-axis direction) of FIG. 2.

[0097]

[0098] Referring to [Table 1] and [Table 2] above, the applied current per cell in the busbar assembly structure of a conventional battery pack may be 32.0 A. The maximum current per cell may be 36.1 A. The minimum current per cell may be 27.9 A. Conventionally, the battery cell having the maximum current value (36.1 A) is a battery cell placed in Cell #13_21 and may have a current value (36.1 A) that is approximately +12.7% higher than the applied current value (32.0 A). Conventionally, the battery cell having the minimum current value (27.9 A) is a battery cell placed in Cell #14_21 and may have a current value (27.9 A) that is approximately -12.8% lower than the applied current value (32.0 A).

[0099] In the busbar assembly structure of such a conventional battery pack, the coefficient of variation may be 7.44%. In this embodiment, the coefficient of variation may refer to the current deviation. That is, the larger the coefficient of variation, the greater the current deviation, and the smaller the coefficient of variation, the smaller the current deviation.

[0100] Applied current / Cell [A]Max current / Cell [A]Min current / Cell [A]Coefficient of variation (standard deviation / average) [%]32.035.4:Cell #13_21(+10.6%)28.7:Cell #14_21(-10.4%)6.1

[0101] Table 3 above discloses the applied current per cell (Applied current / Cell), maximum current per cell (Max current / Cell), minimum current per cell (Min current / Cell), and coefficient of variation in the busbar assembly (50) structure according to the present embodiment. The values ​​of the applied current per cell (Applied current / Cell), maximum current per cell (Max current / Cell), minimum current per cell (Min current / Cell), and coefficient of variation in the busbar assembly structure of the battery pack according to the present embodiment disclosed in Table 3 above were calculated from the measurements of the 16 battery cells disclosed in FIG. 2.

[0102] _24_23_22_21Cell#1233.3632.4431.5730.30Cell#1328.7431.2733.2135.40Cell#1435.2133.1231.2128.68Cell#1529.8731.9732.9133.86

[0103] In [Table 4] above, current values ​​measured in 16 battery cells (10) are disclosed as battery cells (10) disclosed in [Fig. 2]. Referring to [Fig. 4], the preceding Figs. 1 to 3, and [Table 3] and [Table 4], the applied current per cell (Applied current / Cell) in the busbar assembly (50) structure of the battery pack (1) according to the present embodiment may be 32.0 A. The maximum current per cell (Max current / Cell) may be 35.4 A. The minimum current per cell (Min current / Cell) may be 28.7 A. In the present embodiment, the battery cell having the maximum current value (35.4 A) is the battery cell placed in Cell #13_21, and may have a current value (35.4 A) that is approximately +10.6% higher than the applied current value (32.0 A). And, the battery cell having the minimum current value (28.7A) is a battery cell placed in Cell #14_21, and may have a current value (28.7A) that is approximately -10.4% lower than the applied current value (32.0A). In the busbar assembly (50) structure of the battery pack (1) according to this embodiment, the coefficient of variation may be 6.1%.

[0104] As such, in the busbar assembly (50) according to the present embodiment, the busbar body (110) of the bidirectional connection busbar (100) has a predetermined width (w) of approximately 10 mm, so it can be seen that the coefficient of variation is significantly reduced compared to the conventional one. That is, according to the present embodiment, the current deviation can be significantly improved through the increased width (w) of the busbar body (110) compared to the conventional one.

[0105]

[0106] Referring again to FIGS. 2 to 4, the plurality of first electrode connection parts (130) may include an electrode connection part (132) and a body connection part (136).

[0107] The electrode connection portion (132) may be connected to the first electrode (12) of the battery cells (10). Here, the electrode connection portion (132) may be connected to the first electrode (12) of the battery cells (10) through laser welding or through a medium such as a wire. The electrode connection portion (132) may be provided in a shape that roughly corresponds to the shape of the first electrode (12) so as to secure a contact area with the first electrode (12) of the battery cells (10).

[0108] The above body connecting portion (136) protrudes a predetermined length toward one side (+Y-axis direction) of the busbar body (110) and can connect the electrode connecting portion (132) and the busbar body (110).

[0109] The plurality of second electrode connection parts (150) may include an electrode connection part (152) and a body connection part (156).

[0110] The electrode connection portion (152) may be connected to the second electrode (14) of the battery cells (10). Here, the electrode connection portion (152) may be connected to the second electrode (14) of the battery cells (10) via laser welding or via a medium such as a wire. The electrode connection portion (152) may be provided in a roughly semi-elliptical shape and may be connected to one side of the edge of the second electrode (14).

[0111] The above body connecting portion (156) protrudes a predetermined length toward the other side (-Y-axis direction) of the busbar body (110) and can connect the electrode connecting portion (152) and the busbar body (110).

[0112]

[0113] FIG. 5 is a drawing for explaining a busbar assembly according to another embodiment of the present invention, FIG. 6 is a drawing for explaining a bidirectional connection busbar of the busbar assembly of FIG. 2, and FIG. 7 is a drawing for explaining the improvement of current deviation through the bidirectional connection busbar of FIG. 6.

[0114] Since the busbar assembly (51) according to the present embodiment is similar to the busbar assembly (50) of the preceding embodiment, redundant descriptions of configurations that are substantially identical or similar to the preceding embodiment will be omitted, and the following will focus on the differences from the preceding embodiment.

[0115] Referring to FIGS. 5 to 7, the busbar assembly (51) may include a bidirectional connection busbar (200) and a unidirectional connection busbar (900). Since the unidirectional connection busbar (900) is substantially the same or similar as in the preceding embodiment, a redundant description is omitted below.

[0116] The above bidirectional connection busbar (200) may include a busbar body (210), a plurality of first electrode connection parts (230), and a plurality of second electrode connection parts (250).

[0117] The busbar body (210) may have a predetermined width (w). In this embodiment, the busbar body (210) may have a width of approximately 7 mm.

[0118] At least one of the plurality of first electrode connection parts (230) and the plurality of second electrode connection parts (250) may be formed at an angle (θ) inclined from the busbar body (210). Here, the angle (θ) may be approximately 30 degrees. Such an inclined structure at the angle (θ) can reduce the current path length and minimize resistance within the path.

[0119] The plurality of first electrode connection parts (230) and the plurality of second electrode connection parts (250) may be formed at the same angle of inclination from the busbar body (210). Specifically, the body connection part (236) of the plurality of first electrode connection parts (230) and the body connection part (256) of the plurality of second electrode connection parts (250) may be formed at the same angle of inclination while inclining at the predetermined angle (θ). The predetermined angle (θ) may be approximately 30 degrees.

[0120] Meanwhile, the plurality of first electrode connection portions (230) and the plurality of second electrode connection portions (250) of the bidirectional connection busbars (200) facing each other in the width direction (Y-axis direction) of the busbar assembly (51) may have inclination directions opposite to each other. This is for connecting with the battery cells (10) according to the zigzag arrangement of the battery cells (10) in the width direction (Y-axis direction) of the battery cells (10).

[0121]

[0122] Hereinafter, with further reference to the preceding FIGS. 5 to 7 and the following [Table 5] and [Table 6], the current deviation improvement structure of the busbar assembly (51) according to the present embodiment will be examined in more detail.

[0123] Applied current / Cell [A]Max current / Cell [A]Min current / Cell [A]Coefficient of variation (standard deviation / average) [%]32.035.1:Cell #13_21(+9.8%)28.9:Cell #14_21(-9.8%)5.8

[0124] _24_23_22_21Cell#1233.3932.4531.5930.25Cell#1328.9031.4333.1735.14Cell#1435.0333.1231.4028.86Cell#1529.8831.9932.8933.81

[0125] In the busbar assembly (51) structure according to the present embodiment, the applied current per cell (Applied current / Cell) may be 32.0 A. And, the maximum current per cell (Max current / Cell) may be 35.1 A. And, the minimum current per cell (Min current / Cell) may be 28.9 A. In the present embodiment, the battery cell having the maximum current value (35.1 A) is a battery cell placed in Cell #13_21 and may have a current value (35.1 A) that is approximately +9.8% higher than the applied current value (32.0 A). And, the battery cell having the minimum current value (28.9 A) is a battery cell placed in Cell #14_21 and may have a current value (28.9 A) that is approximately -9.8% lower than the applied current value (32.0 A). In the busbar assembly (51) structure according to this embodiment, the coefficient of variation may be 5.8%.

[0126] In this way, in the busbar assembly (51) according to the present embodiment, the coefficient of variation can be significantly reduced compared to the conventional method through the plurality of first electrode connection parts (230) and the plurality of second electrode connection parts (250) formed at an angle (θ) inclined from the busbar body (210) of the bidirectional connection busbar (200). That is, in the present embodiment, the current deviation can be significantly improved compared to the conventional method through the inclined structure at the angle (θ) of the busbar assembly (51). Furthermore, in the present embodiment, the current deviation can be improved without increasing the width (w) of the busbar body (210) compared to the conventional method, thereby reducing the manufacturing cost of the busbar assembly (51) and securing price competitiveness.

[0127]

[0128] FIG. 8 is a drawing for explaining a busbar assembly according to another embodiment of the present invention, FIG. 9 is a drawing for explaining a bidirectional connection busbar of the busbar assembly of FIG. 8, and FIG. 10 is a drawing for explaining the improvement of current deviation through the bidirectional connection busbar of FIG. 9.

[0129] Since the busbar assembly (52) according to the present embodiment is similar to the busbar assembly (51) of the preceding embodiment, redundant descriptions of configurations that are substantially identical or similar to the preceding embodiment will be omitted, and the following will focus on the differences from the preceding embodiment.

[0130] Referring to FIGS. 8 to 10, the busbar assembly (52) may include a bidirectional connection busbar (300) and a unidirectional connection busbar (900). Since the unidirectional connection busbar (900) is substantially the same or similar to the preceding embodiment, a redundant description is omitted below.

[0131] The above bidirectional connection busbar (300) may include a busbar body (310), a plurality of first electrode connection parts (330), and a plurality of second electrode connection parts (350).

[0132] One of the plurality of first electrode connection parts (330) and the plurality of second electrode connection parts (350) may be formed at a predetermined angle (θ) from the busbar body (310). In this embodiment, the plurality of first electrode connection parts (330) may be formed at a predetermined angle (θ) from the busbar body (310). That is, in this embodiment, unlike the previous embodiment, only the plurality of first electrode connection parts (330) among the plurality of first electrode connection parts (330) and the plurality of second electrode connection parts (350) may be formed at a predetermined angle (θ). Here, the predetermined angle (θ) may be approximately 60 degrees. Through a structure having a larger inclination angle of only the plurality of first electrode connection parts (330) as described above, the current path between the plurality of first electrode connection parts (330) and the plurality of second electrode connection parts (350) can be implemented to be shorter.

[0133]

[0134] Hereinafter, with further reference to the preceding FIGS. 8 to 10 and the following [Table 7] and [Table 8], the current deviation improvement structure of the busbar assembly (52) according to the present embodiment will be examined in more detail.

[0135] Applied current / Cell [A]Max current / Cell [A]Min current / Cell [A]Coefficient of variation (standard deviation / average) [%]32.032.9:Cell #13_21(+2.9%)30.8:Cell #13_24(-3.8%)2.0

[0136] _24_23_22_21Cell#1232.2032.0331.8831.55Cell#1330.7831.7232.2632.91Cell#1432.8132.2431.7430.87Cell#1530.8332.1232.2732.46

[0137] In the busbar assembly (52) structure according to the present embodiment, the applied current per cell (Applied current / Cell) may be 32.0 A. And, the maximum current per cell (Max current / Cell) may be 32.9 A. And, the minimum current per cell (Min current / Cell) may be 30.8 A. In the present embodiment, the battery cell having the maximum current value (32.9 A) is a battery cell placed in Cell #13_21 and may have a current value (32.9 A) that is approximately +2.9% higher than the applied current value (32.0 A). And, the battery cell having the minimum current value (30.8 A) is a battery cell placed in Cell #13_24 and may have a current value (30.8 A) that is approximately -3.8% lower than the applied current value (32.0 A). In the busbar assembly (52) structure according to this embodiment, the coefficient of variation may be 2.0%.

[0138] In this way, in the busbar assembly (52) according to the present embodiment, by forming only the plurality of first electrode connection parts (330) at an angle and making the angle of inclination of the predetermined angle (θ) larger, the current path between the plurality of first electrode connection parts (330) and the plurality of second electrode connection parts (350) can be further reduced to further improve the current deviation.

[0139]

[0140] FIG. 11 is a drawing for explaining a busbar assembly according to another embodiment of the present invention, FIG. 12 is a drawing for explaining a bidirectional connection busbar of the busbar assembly of FIG. 11, and FIG. 13 is a drawing for explaining the improvement of current deviation through the bidirectional connection busbar of FIG. 12.

[0141] Since the busbar assembly (53) according to the present embodiment is similar to the busbar assembly (51) of the preceding embodiment, redundant descriptions of configurations that are substantially identical or similar to the preceding embodiment will be omitted, and the following will focus on the differences from the preceding embodiment.

[0142] Referring to FIGS. 11 to 13, the busbar assembly (53) may include a bidirectional connection busbar (400) and a unidirectional connection busbar (900). Since the unidirectional connection busbar (900) is substantially the same or similar to the preceding embodiment, a redundant description is omitted below.

[0143] The above bidirectional connection busbar (400) may include a busbar body (410), a plurality of first electrode connection parts (430), and a plurality of second electrode connection parts (450).

[0144] The plurality of first electrode connection portions (430) and the plurality of second electrode connection portions (450) may be formed at an angle (θ) inclined from the busbar body (410). Here, the angle (θ) may be approximately 30 degrees. Such an inclined structure at the angle (θ) can reduce the current path length and minimize resistance within the path.

[0145] The plurality of first electrode connection parts (430) and the plurality of second electrode connection parts (450) may be formed at the same angle of inclination from the busbar body (410). Specifically, in the case of the plurality of first electrode connection parts (430), the body connection part (436) may be formed at an angle of the predetermined angle (θ). And in the case of the plurality of second electrode connection parts (450), both the body connection part (456) and the electrode connection part (452) may be formed at an angle of the predetermined angle (θ). Such an inclined structure of both the body connection part (456) and the electrode connection part (452) of the plurality of second electrode connection parts (450) can further reduce the current path on the side of the plurality of second electrode connection parts (450).

[0146]

[0147] Hereinafter, with further reference to the preceding FIGS. 11 to 13 and the following [Table 9] and [Table 10], the current deviation improvement structure of the busbar assembly (53) according to the present embodiment will be examined in more detail.

[0148] Applied current / Cell [A]Max current / Cell [A]Min current / Cell [A]Coefficient of variation (standard deviation / average) [%]32.033.3:Cell #13_21(+4.0%)30.4:Cell #13_24(-4.9%)2.7

[0149] _24_23_22_21Cell#1232.5132.1431.8231.21Cell#1330.4431.6132.3633.27Cell#1433.2032.3531.6330.48Cell#1530.6232.0032.3332.72

[0150] In the busbar assembly (53) structure according to the present embodiment, the applied current per cell (Applied current / Cell) may be 32.0 A. And, the maximum current per cell (Max current / Cell) may be 33.3 A. And, the minimum current per cell (Min current / Cell) may be 30.4 A. In the present embodiment, the battery cell having the maximum current value (33.3 A) is a battery cell placed in Cell #13_21 and may have a current value (33.3 A) that is approximately +4.0% higher than the applied current value (32.0 A). And, the battery cell having the minimum current value (30.4 A) is a battery cell placed in Cell #13_24 and may have a current value (30.4 A) that is approximately -4.9% lower than the applied current value (32.0 A). In the busbar assembly (53) structure according to this embodiment, the coefficient of variation may be 2.7%.

[0151] In this way, in the busbar assembly (53) according to the present embodiment, by forming both the body connection part (456) and the electrode connection part (452) of the plurality of second electrode connection parts (450) at an angle (θ), the current path on the side of the plurality of second electrode connection parts (450) can be further reduced to improve the current deviation.

[0152]

[0153] FIG. 14 is a drawing for explaining a busbar assembly according to another embodiment of the present invention, FIG. 15 is a drawing for explaining a bidirectional connection busbar of the busbar assembly of FIG. 14, and FIG. 16 is a drawing for explaining the improvement of current deviation through the bidirectional connection busbar of FIG. 15.

[0154] Since the busbar assembly (54) according to the present embodiment is similar to the busbar assembly (53) of the preceding embodiment, redundant descriptions of configurations that are substantially identical or similar to the preceding embodiment will be omitted, and the following will focus on the differences from the preceding embodiment.

[0155] Referring to FIGS. 14 to 16, the busbar assembly (54) may include a bidirectional connection busbar (500) and a unidirectional connection busbar (900). Since the unidirectional connection busbar (900) is substantially the same or similar to the preceding embodiment, a redundant description is omitted below.

[0156] The above bidirectional connection busbar (500) may include a busbar body (510), a plurality of first electrode connection parts (530), and a plurality of second electrode connection parts (550).

[0157] The plurality of first electrode connection portions (530) and the plurality of second electrode connection portions (550) may be formed at a predetermined angle (θ) from the busbar body (510). Here, the predetermined angle (θ) may be approximately 30 degrees. Such a sloped structure at the predetermined angle (θ) can reduce the current path length and minimize resistance within the path.

[0158] The plurality of first electrode connection parts (530) and the plurality of second electrode connection parts (550) may be formed at the same angle of inclination from the busbar body (410). Specifically, in the case of the plurality of first electrode connection parts (530), both the body connection part (536) and the electrode connection part (532) may be formed at an angle of inclination at the predetermined angle (θ). Also, the plurality of second electrode connection parts (550), as well as both the body connection part (556) and the electrode connection part (552), may be formed at an angle of inclination at the predetermined angle (θ).

[0159] Accordingly, the plurality of first electrode connection parts (530) and the plurality of second electrode connection parts (550) can be arranged in a straight line with respect to each other with the busbar body (510) in between. More specifically, the plurality of first electrode connection parts (530) and the plurality of second electrode connection parts (550) can be arranged in a straight line with respect to each other with respect to the busbar body (510).

[0160] The inclined structure of both the body connection part (536) and the electrode connection part (532) of the plurality of first electrode connection parts (530), and the inclined structure of both the body connection part (556) and the electrode connection part (552) of the plurality of second electrode connection parts (550), can further reduce the current path on both the sides of the plurality of first electrode connection parts (530) and the plurality of second electrode connection parts (550).

[0161]

[0162] Hereinafter, with further reference to the preceding FIGS. 14 to 16 and the following [Table 11] and [Table 12], the structure for improving current deviation of the busbar assembly (54) according to the present embodiment will be examined in more detail.

[0163] Applied current / Cell [A]Max current / Cell [A]Min current / Cell [A]Coefficient of variation (standard deviation / average) [%]32.032.7:Cell #13_21(+2.2%)31.0:Cell #13_24(-3.1%)1.6

[0164] _24_23_22_21Cell#1232.1432.0331.9431.58Cell#1331.0031.7932.2332.72Cell#1432.6132.2031.8231.08Cell#1531.0032.1332.2532.36

[0165] In the busbar assembly (54) structure according to the present embodiment, the applied current per cell (Applied current / Cell) may be 32.0 A. And, the maximum current per cell (Max current / Cell) may be 32.7 A. And, the minimum current per cell (Min current / Cell) may be 31.0 A. In the present embodiment, the battery cell having the maximum current value (32.7 A) is a battery cell placed in Cell #13_21 and may have a current value (32.7 A) that is approximately +2.2% higher than the applied current value (32.0 A). And, the battery cell having the minimum current value (31.0 A) is a battery cell placed in Cell #13_24 and may have a current value (31.0 A) that is approximately -3.1% lower than the applied current value (32.0 A). In the busbar assembly (54) structure according to this embodiment, the coefficient of variation may be 1.6%.

[0166] In this way, in the busbar assembly (54) according to the present embodiment, both the body connection part (536) and the electrode connection part (532) of the plurality of first electrode connection parts (530), and both the body connection part (556) and the electrode connection part (552) of the plurality of second electrode connection parts (550) are formed to be inclined at the predetermined angle (θ), thereby further reducing the current path on both the sides of the plurality of first electrode connection parts (530) and the plurality of second electrode connection parts (550) and minimizing the resistance within the path, so that the current deviation can be further improved.

[0167]

[0168] FIG. 17 is a drawing for explaining a busbar assembly according to another embodiment of the present invention, FIG. 18 is a drawing for explaining a bidirectional connection busbar of the busbar assembly of FIG. 17, and FIG. 19 is a drawing for explaining the improvement of current deviation through the bidirectional connection busbar of FIG. 18.

[0169] Since the busbar assembly (55) according to the present embodiment is similar to the busbar assembly (54) of the preceding embodiment, redundant descriptions of configurations that are substantially identical or similar to the preceding embodiment will be omitted, and the following will focus on the differences from the preceding embodiment.

[0170] Referring to FIGS. 17 to 19, the busbar assembly (55) may include a bidirectional connection busbar (600) and a unidirectional connection busbar (900). Since the unidirectional connection busbar (900) is substantially the same or similar to the preceding embodiment, a redundant description is omitted below.

[0171] The above bidirectional connection busbar (600) may include a busbar body (610), a plurality of first electrode connection parts (630), and a plurality of second electrode connection parts (650).

[0172] The plurality of first electrode connection portions (630) may be formed in a row on the busbar body (610). The plurality of first electrode connection portions (630) may be spaced apart from each other by a predetermined distance along the length direction (X-axis direction) of the busbar body (610).

[0173] The plurality of second electrode connection parts (650) may be formed at an angle (θ) inclined from the plurality of first electrode connection parts (630). The predetermined angle (θ) may be approximately 30 degrees.

[0174] The plurality of second electrode connection parts (650) may include an electrode connection part (652) and a body connection part (656) connecting the electrode connection part (652) and the plurality of first electrode connection parts (630). Both the body connection part (656) and the electrode connection part (652) of the plurality of second electrode connection parts (550) may be formed to be inclined at the predetermined angle (θ).

[0175] In this embodiment, the plurality of first electrode connection portions (630) are formed in a row on the busbar body (610) along the length direction (X-axis direction) of the busbar body (610), thereby further shortening the current path.

[0176]

[0177] Hereinafter, with further reference to the preceding FIGS. 17 to 19 and the following [Table 13] and [Table 14], the current deviation improvement structure of the busbar assembly (55) according to the present embodiment will be examined in more detail.

[0178] Applied current / Cell [A]Max current / Cell [A]Min current / Cell [A]Coefficient of variation (standard deviation / average) [%]32.032.4:Cell #15_23(+1.3%)31.3:Cell #15_24(-2.3%)0.8

[0179] _24_23_22_21Cell#1231.8631.9231.9831.92Cell#1331.7332.0432.1732.04Cell#1431.9632.1132.0131.70Cell#1531.2632.4032.3332.02

[0180] In the busbar assembly (55) structure according to the present embodiment, the applied current per cell (Applied current / Cell) may be 32.0 A. And, the maximum current per cell (Max current / Cell) may be 32.4 A. And, the minimum current per cell (Min current / Cell) may be 31.3 A. In the present embodiment, the battery cell having the maximum current value (32.4 A) is a battery cell placed in Cell #15_23 and may have a current value (32.4 A) that is approximately +1.3% higher than the applied current value (32.0 A). And, the battery cell having the minimum current value (31.3 A) is a battery cell placed in Cell #15_24 and may have a current value (31.3 A) that is approximately -2.3% lower than the applied current value (32.0 A). In the busbar assembly (55) structure according to this embodiment, the coefficient of variation may be 0.8%.

[0181] In this way, in the busbar assembly (55) according to the present embodiment, the plurality of first electrode connection portions (630) are formed in a row on the busbar body (610) along the length direction (X-axis direction) of the busbar body (610), thereby further shortening the current path and further improving the current deviation.

[0182]

[0183] FIG. 20 is a drawing for explaining a busbar assembly according to another embodiment of the present invention, FIG. 21 is a drawing for explaining a bidirectional connection busbar of the busbar assembly of FIG. 20, and FIG. 22 is a drawing for explaining the improvement of current deviation through the bidirectional connection busbar of FIG. 21.

[0184] Since the busbar assembly (56) according to the present embodiment is similar to the busbar assembly (50) of the preceding embodiment, redundant descriptions of configurations that are substantially identical or similar to the preceding embodiment will be omitted, and the following will focus on the differences from the preceding embodiment.

[0185] Referring to FIGS. 20 to 22, the busbar assembly (56) may include a bidirectional connection busbar (700) and a unidirectional connection busbar (900). Since the unidirectional connection busbar (900) is substantially the same or similar to the preceding embodiment, a redundant description is omitted below.

[0186] The above bidirectional connection busbar (700) may include a busbar body (710), a plurality of first electrode connection parts (730), and a plurality of second electrode connection parts (750).

[0187] A bending structure may be formed in at least one of the plurality of first electrode connection parts (730) and the plurality of second electrode connection parts (750). In this embodiment, a bending structure may be formed in the plurality of first electrode connection parts (730). The bending structure of the plurality of first electrode connection parts (730) may be formed by bending once from the busbar body (710). The bending angle of the bending structure may be 90 degrees.

[0188] Through the bending structure of the plurality of first electrode connection parts (730) as described above, the current path passing through both sides (+Y-axis direction and -Y-axis direction) in the width direction (Y-axis direction) of the busbar body (710) can be straightened to correspond to the width of the busbar body (710). In other words, by straightening the current path between the end (-Y-axis direction) of the body connection part (736) opposite the electrode connection part (732) of the plurality of first electrode connection parts (730), the end (+Y-axis direction) of the width direction of the busbar body (710), the other end (-Y-axis direction) of the width direction of the busbar body (710), and the end (+Y-axis direction) of the body connection part (756) opposite the electrode connection part (752) of the plurality of second electrode connection parts (756), the current path when passing through the busbar body (710) can be optimized in the width direction (Y-axis direction) of the busbar body (710).

[0189]

[0190] Hereinafter, with further reference to the preceding FIGS. 20 to 22 and the following [Table 15] and [Table 16], the current deviation improvement structure of the busbar assembly (56) according to the present embodiment will be examined in more detail.

[0191] Applied current / Cell [A]Max current / Cell [A]Min current / Cell [A]Coefficient of variation (standard deviation / average) [%]32.032.4:Cell #15_23(+1.3%)31.7:Cell #12_24(-0.9%)0.5

[0192] _24_23_22_21Cell#1231.7131.9032.0432.02Cell#1332.0432.1732.2132.10Cell#1431.9432.0932.1032.00Cell#1531.7232.4032.2932.09

[0193] In the busbar assembly (56) structure according to the present embodiment, the applied current per cell (Applied current / Cell) may be 32.0 A. And, the maximum current per cell (Max current / Cell) may be 32.4 A. And, the minimum current per cell (Min current / Cell) may be 31.7 A. In the present embodiment, the battery cell having the maximum current value (32.4 A) is a battery cell placed in Cell #15_23 and may have a current value (32.4 A) that is approximately +1.3% higher than the applied current value (32.0 A). And, the battery cell having the minimum current value (31.7 A) is a battery cell placed in Cell #12_24 and may have a current value (31.7 A) that is approximately -0.9% lower than the applied current value (32.0 A). In the busbar assembly (56) structure according to this embodiment, the coefficient of variation may be 0.5%.

[0194] In this way, in the busbar assembly (56) according to the present embodiment, the current path path when passing through the busbar body (710) is optimized in the width direction (Y-axis direction) of the busbar body (710), thereby further improving the current deviation.

[0195]

[0196] Referring again to FIGS. 1 and FIGS. 2, the one-way connection busbar (900) may include a busbar body (910) and an electrode connection part (920).

[0197] The above busbar body (910) may be provided with a metal material having a predetermined length and width.

[0198] The electrode connection portion (920) is formed to protrude from the busbar body (910) and may be provided in a plurality. The plurality of electrode connection portions (920) may be connected to any one of the electrodes (12, 14) of the battery cells (10) with the same polarity (12, 14).

[0199] The busbar assembly (50) may further include a pair of busbar covers provided on the upper and lower sides of the unidirectional connection busbar (900) and the bidirectional connection busbar (100). The pair of busbar covers may include an insulating material, for example, a polyimide film. The pair of busbar covers may include at least one opening to guide the electrical connection between the unidirectional connection busbar (900), the bidirectional connection busbar (100), and the battery cells (10).

[0200] Meanwhile, it goes without saying that the battery pack (1) may be configured to include at least one of the busbar assemblies (51 to 56) of the preceding embodiments. Additionally, depending on the design, the battery pack (1) may be configured such that the bidirectional connection busbars are composed of at least one combination of the bidirectional connection busbars (100, 200, 300, 400, 500, 600, 700) of the preceding busbar assemblies (50 to 56).

[0201] And, the battery pack (1) may further include a cooling tube (70).

[0202] The cooling tube (70) is for cooling the plurality of battery cells (10), is formed to be long with a predetermined length, and can be provided between the plurality of battery cells (10). The cooling tube (70) can be provided in multiple numbers.

[0203] The plurality of cooling tubes (70) may be provided to be in contact with the outer surface of the plurality of battery cells (10) to increase cooling performance. The plurality of cooling tubes (70) may be provided with cooling channels for the flow of a cooling medium. Additionally, the plurality of cooling tubes (70) may be connected to a cooling device, etc., for the circulation of the cooling medium. The cooling medium may be provided as a cooling fluid. In this embodiment, the cooling fluid may be provided as water, and may include not only water but also one or more fluids capable of exchanging heat with the surrounding environment.

[0204] The above battery pack (1) may include a pack case (not shown).

[0205] The above pack case can accommodate the aforementioned components constituting the battery pack (1), including the cooling tube (70). To this end, a predetermined receiving space may be provided in the pack case.

[0206] In addition, the battery pack (1) may include an electric field unit.

[0207] The above electrical unit is provided in the pack case and may include electrical components such as a BMS for controlling the battery pack (10). The above electrical unit may further include components such as a current sensor, a fuse, and a service plug.

[0208]

[0209] FIG. 23 is a drawing for explaining an automobile according to one embodiment of the present invention.

[0210] Referring to FIG. 23, a vehicle (V) according to one embodiment of the present invention may include at least one battery pack (1) according to the present invention. In addition, the vehicle (V) according to one embodiment of the present invention may include various other components included in the vehicle in addition to the battery pack (1). For example, the vehicle (V) according to one embodiment of the present invention may include, in addition to the battery pack (1) according to one embodiment of the present invention, a vehicle body, a motor, an ECU (electronic control unit), or other control devices.

[0211] In addition, it is obvious that the battery pack (1) according to one embodiment of the present invention may also be provided in other devices, mechanisms, and facilities, such as an energy storage system using a secondary battery, in addition to the vehicle (V).

[0212]

[0213] According to various embodiments as described above, a battery pack (1) having a busbar assembly (50, 51, 52, 53, 54, 55, 56) capable of minimizing the current deviation of battery cells (10) and a vehicle (V) including the same can be provided.

[0214] In addition, according to various embodiments as described above, a battery pack (1) capable of extending the lifespan of battery cells (10) and reducing temperature variation and a vehicle (V) including the same can be provided.

[0215] In addition, according to the various embodiments described above, a battery pack (1) capable of increasing the capacity of the available battery pack (1) and improving the lifespan of the battery pack (1) and a vehicle (V) including the same can be provided.

[0216]

[0217] As described above, although the present invention has been explained by limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs.

Claims

1. Regarding battery packs, Multiple battery cells; and A busbar assembly electrically connected to the plurality of battery cells on one side of the plurality of battery cells and formed to have at least one of a predetermined width and a predetermined angle to enable uniform current distribution among the plurality of battery cells. A battery pack characterized by including 2. In Paragraph 1, The above busbar assembly is, Bidirectional connection busbars connected to the electrodes of the battery cells on each side in the width direction of the busbar assembly; and It includes a unidirectional connection busbar connected to the electrodes of the battery cells on one side in the width direction of the busbar assembly, and The above bidirectional connection busbar is, A battery pack characterized by being configured to have at least one of the predetermined width and the predetermined angle to evenly distribute current to each battery cell side connected on both sides in the width direction of the busbar assembly.

3. In Paragraph 2, The above bidirectional connection busbar is, A busbar body formed with a predetermined length along the longitudinal direction of the above busbar assembly; A plurality of first electrode connection portions formed on the busbar body and spaced apart from each other by a predetermined distance along the longitudinal direction of the busbar assembly; and A plurality of second electrode connection parts formed on the busbar body and spaced apart from each other by a predetermined distance along the longitudinal direction of the busbar assembly. Includes, Each first electrode connection part and each second electrode connection part, A battery pack characterized by being connected to the busbar body with a predetermined spacing so that the current between the first electrode connection part and the second electrode connection part is evenly distributed.

4. In Paragraph 3, The above busbar body is, A battery pack characterized by having the predetermined width in the width direction of the busbar assembly.

5. In Paragraph 1, The above predetermined width is, A battery pack characterized by being 10mm.

6. In Paragraph 3, At least one of the plurality of first electrode connection parts and the plurality of second electrode connection parts is A battery pack characterized by being formed at a predetermined angle from the busbar body.

7. In Paragraph 1, The above predetermined angle is, A battery pack characterized by being 30 degrees.

8. In Paragraph 3, The plurality of first electrode connection parts and the plurality of second electrode connection parts are A battery pack characterized by being formed at an equal angle from the busbar body.

9. In Paragraph 3, The plurality of first electrode connection parts and the plurality of second electrode connection parts are A battery pack characterized by being arranged in a straight line with the above-mentioned busbar body in between.

10. In Paragraph 3, The plurality of first electrode connection parts and the plurality of second electrode connection parts are A battery pack characterized by being arranged diagonally from each other with the above-mentioned busbar body in between.

11. In Paragraph 3, The above plurality of first electrode connection parts are, A battery pack characterized by being formed in a row on the above-mentioned busbar body.

12. In Paragraph 3, The above plurality of second electrode connection parts are, A battery pack characterized by being formed at a predetermined angle from the plurality of first electrode connection portions.

13. In Paragraph 3, At least one of the plurality of first electrode connection parts and the plurality of second electrode connection parts, A battery pack characterized by the formation of a folded structure.

14. In Paragraph 3, The above plurality of first electrode connection parts are, A battery pack characterized by being formed by folding once from the above-mentioned busbar body.

15. In Paragraph 13, The bending angle of the above bending structure is, A battery pack characterized by being 90 degrees.

16. In automobiles, An automobile characterized by including at least one battery pack according to any one of claims 1 to 15.

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