Battery pack and vehicle comprising a battery pack

Abstract

A battery pack capable of preventing tab breakage due to swelling of battery cells, and a vehicle including the same, and the battery pack includes: a cell assembly including a plurality of battery cells arranged in at least one row; and a busbar assembly electrically connected to the cell assembly, wherein the busbar assembly includes: a busbar frame provided in a predetermined length along a direction of arrangement of the plurality of battery cells; and at least one busbar connected to electrode leads of the plurality of battery cells and mounted to the busbar frame so as to be movable along a length direction of each busbar frame.

Description

Technical Field

[0001] This disclosure relates to battery packs and vehicles including battery packs, and more specifically, to a battery pack and a vehicle including a battery pack capable of preventing the tabs from disconnecting due to the expansion of the battery cells.

[0002] This application is based on and claims priority to Korean Patent Application No. 10-2024-0150941, filed with the Korean Intellectual Property Office on October 30, 2024, the disclosure of which is incorporated herein by reference in its entirety. Background Technology

[0003] Secondary batteries offer high applicability across product categories and possess electrical characteristics such as high energy density. They are widely used not only in portable devices but also in electric vehicles (EVs) and hybrid electric vehicles (HEVs) powered by electric sources. Due to their significant advantage of reducing fossil fuel use, and because they produce no byproducts in their energy use, secondary batteries are attracting considerable attention as a new energy source for improving environmental sustainability and energy efficiency.

[0004] Currently widely used rechargeable batteries include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The operating voltage of a single rechargeable battery cell (i.e., a single battery cell) is approximately 2.5V to 4.5V. Therefore, when an output voltage higher than this operating voltage is required, a battery pack can be configured by connecting multiple battery cells in series. Alternatively, depending on the required charge / discharge capacity of the battery pack, a battery pack can be configured by connecting multiple battery cells in parallel. Therefore, the number of battery cells included in a battery pack can be set in various ways according to the required output voltage or charge / discharge capacity.

[0005] Furthermore, techniques such as increasing the number and size of electrode tabs and leads have been employed to accommodate the high-capacity environment of secondary batteries. However, simply increasing the number and / or size of electrode tabs and leads makes it difficult to ensure a stable and reliable connection between the electrode tabs and leads. Moreover, with the increase in the number and / or size of electrode tabs and leads, the load may cause the electrode tabs to break during welding, especially in pouch cells.

[0006] Here, the electrode assembly is formed by alternately laminating positive and negative electrode plates. The positive and negative electrode plates are separated by a diaphragm. Electrode tabs are connected to the electrode plates according to their polarity. Leads are soldered to the electrode tab stack where the electrode tabs are assembled.

[0007] Traditionally, the starting position of the electrode tab stack is very close to the electrode assembly, and therefore the welding position of the electrode tabs and leads is also very close to the electrode assembly. Consequently, the portion of the electrode tab protruding from the electrode assembly is highly susceptible to stress due to its being stretched taut while tilted at a steep angle. This, in turn, can lead to disconnection when a load is applied to this portion during welding. Furthermore, in this configuration, the expansion of the battery cell increases the overall width of the cell assembly during use, thus placing high tension on the welded electrode leads. This can also cause the stretched and steeply tilted portion of the electrode tab to break.

[0008] Therefore, it is necessary to develop a battery pack with a structure that prevents the electrode tabs from breaking even when cell expansion occurs due to battery use. Summary of the Invention

[0009] Technical issues

[0010] This disclosure is designed to address the problems of the prior art, and therefore aims to provide a battery pack having a structure capable of improving the bonding stability between electrode leads and electrode tabs, and a vehicle including the battery pack.

[0011] This disclosure also aims to provide a battery pack having a structure capable of preventing the tabs from breaking due to the expansion of the battery cells, and a vehicle including the battery pack.

[0012] This disclosure also aims to provide a battery pack having a structure capable of further ensuring additional length of electrode leads and a vehicle including the battery pack.

[0013] However, the technical problems sought to be solved by this disclosure are not limited to those described above, and those skilled in the art will clearly understand from the description of the invention below that other problems not mentioned above will also be apparent.

[0014] Technical solution

[0015] In one aspect of this disclosure, a battery pack is provided, the battery pack comprising: a cell assembly including a plurality of battery cells arranged in at least one row; and a busbar assembly electrically connected to the cell assembly, wherein the busbar assembly may include: a busbar frame having a predetermined length and disposed along the arrangement direction of the plurality of battery cells; and at least one busbar connected to electrode leads of the plurality of battery cells and mounted to the busbar frame so as to be independently movable along the length direction of each of the busbar frames.

[0016] For example, the busbar frame can be configured as a pair of guide frames arranged in parallel at predetermined distances.

[0017] For example, the at least one busbar can be configured to slide between the pair of guide frames along the length direction of the busbar frame.

[0018] For example, the width of the electrode lead can be smaller than the width of the busbar and the electrode lead can be soldered to the busbar so as not to contact the busbar frame.

[0019] For example, the length of the outermost electrode lead among the multiple electrode leads connected together to the busbar can be longer than the length of the electrode leads between the outermost electrode leads.

[0020] For example, the electrode lead can be bent at least once.

[0021] For example, at least some of the multiple electrode leads connected together to the busbar can be configured such that the bent portions of the electrode leads are partially straightened by the movement of the busbar due to the expansion of the battery cell.

[0022] For example, the bent portion of the electrode lead can be located in the space between the cell housing of the battery cell and the busbar.

[0023] For example, the multiple electrode leads connected together to the busbar can be bent toward the center of the multiple electrode leads.

[0024] For example, the busbar can be configured as a plurality of busbars and the plurality of busbars can be configured to be spaced apart from each other at a predetermined distance along the length direction of the busbar frame.

[0025] For example, the busbar assembly may include at least one separator configured to be spaced apart from each busbar by a predetermined distance between adjacent busbars.

[0026] For example, the busbar frame may include: a first longitudinal end and a second longitudinal end, the first longitudinal end and the second longitudinal end being disposed at both ends of the busbar frame in the length direction; and a groove formed to be recessed from a surface of the busbar frame to a predetermined depth along the length direction of the busbar frame and extending from the first longitudinal end to the second longitudinal end.

[0027] For example, the separator may have a connecting portion that inserts into the groove to allow it to slide along the length direction of the busbar frame.

[0028] For example, the busbar frame may include at least one fixing part with a through hole of a predetermined size.

[0029] For example, the separator can be fixed to the busbar frame via the fixing part.

[0030] For example, the busbar frame may include at least one recess formed to be recessed from one surface of the busbar frame to a predetermined depth.

[0031] For example, the separator can be configured to be inserted into the recess and fixed in position.

[0032] For example, the busbar frame may include: a first longitudinal end and a second longitudinal end, the first longitudinal end and the second longitudinal end being disposed at both ends of the busbar frame in the length direction; and a groove formed to be recessed from a surface of the busbar frame to a predetermined depth along the length direction of the busbar frame and extending from the first longitudinal end to the second longitudinal end.

[0033] For example, the busbar may include a connecting portion inserted into the groove to allow it to slide along the length direction of the busbar frame.

[0034] For example, the busbar assembly may be configured such that at least one of the connecting portion of the busbar and the groove of the busbar frame is formed as a curved surface.

[0035] For example, the busbar assembly may include an end portion configured to make surface contact with at least one of the first longitudinal end portion and the second longitudinal end portion.

[0036] For example, the end portion may include: at least one protrusion protruding from one surface of the end portion; and an elastic portion connected to the end of the protrusion and made of an elastic material with a cross-sectional area larger than that of the protrusion.

[0037] For example, the protrusion and the elastic portion can be fitted into an insertion portion formed in either the first longitudinal end or the second longitudinal end.

[0038] For example, the busbar may be arranged along the length direction of the busbar frame, and may have a concave shape on at least a portion of the side surface of the busbar that is not connected to the busbar frame.

[0039] For example, the electrode leads can be bent along the concave shape.

[0040] For example, the cell assembly may include at least one buffer section disposed between the plurality of battery cells.

[0041] For example, the battery pack may include a battery pack housing that accommodates the plurality of battery cells, and the battery pack housing may include a base plate that supports the cell assembly and a pair of side plates that respectively support both sides of the cell assembly.

[0042] For example, the busbar frame can be disposed on the pair of side plates and fixed by at least one bracket.

[0043] For example, the battery pack may also include a frame support plate disposed between the pair of busbar frames and configured to support the busbar assembly from the side.

[0044] For example, the battery pack may include a protective pad disposed between the cell assembly and the busbar assembly.

[0045] In another aspect of this disclosure, a vehicle is provided that includes at least one of the aforementioned battery packs.

[0046] Beneficial effects

[0047] Battery packs and vehicles including battery packs according to various embodiments of the present disclosure have the effect of preventing the welded portions of electrode tabs and electrode leads from breaking.

[0048] Furthermore, battery packs and vehicles including battery packs according to various embodiments have the effect of reducing the tension applied to the electrode leads of the battery cells even when the battery cells expand.

[0049] Furthermore, battery packs and vehicles including battery packs according to various embodiments have the effect of effectively ensuring the margin of electrode leads.

[0050] However, the effects that can be obtained by this disclosure are not limited to those described above, and those skilled in the art will clearly understand other effects not mentioned above through the following description of the invention. Attached Figure Description

[0051] Figure 1 This is a schematic plan view of a battery pack according to an embodiment of the present disclosure.

[0052] Figure 2 It shows the basis Figure 1 A diagram showing the movement of the busbars in the busbar assembly of the battery pack.

[0053] Figure 3 It is along Figure 1 A schematic cross-sectional view of the battery pack taken by line A-A'.

[0054] Figure 4 It is along Figure 1 A schematic cross-sectional view of the battery pack taken by line B-B'.

[0055] Figure 5 It shows the basis Figure 4 A diagram showing the expansion state of multiple battery cells in a battery pack.

[0056] Figure 6 It is a schematic representation based on Figure 1 Exploded perspective view of the busbar assembly of the battery pack.

[0057] Figure 7 It shows the basis Figure 6 A diagram showing the component structure of the busbar assembly.

[0058] Figure 8 It is along Figure 7 A schematic cross-sectional view of the busbar assembly taken by line C-C'.

[0059] Figure 9 It is a schematic representation of the basis Figure 7 An exploded perspective view of another embodiment of the busbar assembly.

[0060] Figure 10 It shows the basis Figure 9 A diagram showing the component structure of the busbar assembly.

[0061] Figure 11 It schematically shows along Figure 10 The cross-sectional view of the busbar assembly is taken from line E-E'.

[0062] Figure 12 It schematically shows along Figure 7 The cross-sectional view of the busbar assembly is taken from line D-D'.

[0063] Figure 13 It is a schematic representation based on Figure 12 A cross-sectional view of another embodiment of the busbar assembly.

[0064] Figure 14 It shows the basis Figure 6 A diagram of the component structure at the end of the busbar assembly.

[0065] Figure 15 It is a schematic representation of the path along Figure 14 The cross-sectional view of the end of the busbar assembly is taken by line F-F'.

[0066] Figure 16 It is a schematic representation of the path along Figure 1 Another example of a cross-sectional view of a battery pack, taken by line B-B'.

[0067] Figure 17 It is a schematic representation based on Figure 16 The diagram of the busbars.

[0068] Figure 18 This is a schematic diagram of a battery pack according to another embodiment of the present disclosure.

[0069] Figure 19 It is based on Figure 18 A schematic diagram of the bracket that is fixed to the battery pack housing.

[0070] Figure 20 This is a schematic diagram of a battery pack according to another embodiment of the present disclosure.

[0071] Figure 21 This is a schematic diagram of a battery pack according to another embodiment of the present disclosure.

[0072] Figure 22 It shows the basis Figure 21 A diagram of the protective pads for the battery pack.

[0073] Figure 23 This is a schematic diagram of a vehicle including the battery pack described above. Detailed Implementation

[0074] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Before the description, it should be understood that the terminology used in the specification and appended claims should not be construed as limited to its general and dictionary meaning, but should be interpreted according to the meaning and concept corresponding to the technical aspects of the present disclosure, based on the principle that inventors are allowed to appropriately define terms for the best interpretation.

[0075] Therefore, the description presented herein is merely a preferred example for illustrative purposes and does not represent the full scope of this disclosure. It should be understood that other equivalents and modifications may be made thereto without departing from the scope of this disclosure at the time of its submission.

[0076] Furthermore, this disclosure may include various embodiments. Redundant descriptions of substantially the same or similar configurations will be omitted from the various embodiments, and descriptions will be based on the differences between them.

[0077] Furthermore, for the purpose of better understanding this disclosure, the drawings are not necessarily drawn to scale, and the dimensions of certain elements may be exaggerated for clarity. Additionally, the same reference numerals may indicate the same elements in different embodiments.

[0078] Ordinal terms such as "first" and "second" can be used to describe various components, but components are not limited by these terms. These terms are only used to distinguish one component from another. Therefore, unless otherwise explicitly stated, the first component can be the same as the second component.

[0079] Throughout this instruction manual, unless otherwise expressly stated, each component may be singular or plural.

[0080] The configuration of a component being positioned in the "upper (or lower) part" or "top (or bottom)" of a target component indicates that the component can be configured to contact the upper (or lower) surface of the target component, and indicates that another component can be inserted between the target component and the component positioned at the top (or bottom) of the target component.

[0081] Furthermore, the statement “one element is ‘connected,’ ‘joined,’ or ‘joined’ to another element” should be understood as meaning that the two elements can be directly connected or joined to each other, and that the other element can be “inserted” between the two elements, or that the two elements can be “connected,” “joined,” or “joined” via the other element.

[0082] Unless otherwise stated, the use of a single element herein should be interpreted as including multiple elements. In this specification, the expression “a component” constitutes or includes elements or steps should not be construed as meaning that the component must include all elements or steps, but rather as meaning that the component may exclude some of the elements or steps and that the component may also include additional elements or steps.

[0083] Furthermore, although directional terms such as up, down, left, right, forward, and backward are used in this specification, it will be apparent to those skilled in the art to which this disclosure pertains that these terms are merely for the convenience of interpretation with reference to the accompanying drawings and may vary depending on the position, arrangement, or rotation of the target object or the position of the observer.

[0084] This disclosure can be implemented independently through each of the following embodiments. Furthermore, this disclosure can also be implemented by combining two or more of the following embodiments. Each of the following embodiments can not only be implemented independently, but can also be freely combined with each other.

[0085] As an example, the X-axis direction in the accompanying drawings of this disclosure represents the stacking direction of the battery cells, and the Z-axis direction represents the direction perpendicular to the ground.

[0086] First, refer to Figure 1 and Figure 2The overall structure of the battery pack 10 according to an embodiment of the present disclosure is described.

[0087] Figure 1 This is a schematic plan view of a battery pack 10 according to an embodiment of the present disclosure, and Figure 2 It shows the basis Figure 1 A diagram showing the movement of the busbar 220 in the busbar assembly 200 of the battery pack 10.

[0088] Reference Figure 1 and Figure 2 According to an embodiment of the present disclosure, the battery pack 10 includes a cell assembly 100 and a busbar assembly 200. The cell assembly 100 includes a plurality of battery cells 110 arranged in at least one row, and the busbar assembly 200 is electrically connected to the cell assembly 100.

[0089] The battery cells 110 of the battery cell assembly 100 can be classified as cylindrical battery cells, prismatic battery cells, and pouch battery cells. In the following description, as shown in the accompanying drawings, in this embodiment, the battery cell 110 will be described as a pouch battery cell. A pouch battery cell generally refers to a battery cell 110 in which the cell housing 114 housing the electrode assembly 111 is a pouch-shaped housing.

[0090] The electrode leads 113 of the multiple battery cells 110 typically protrude / extend to the outside of the cell housing 114. The pouch battery cell may include electrode leads 113 of a first polarity and electrode leads 113 of a second polarity, and multiple pouch battery cells may be stacked in at least one row to contact each other, thereby forming at least one cell assembly 100.

[0091] Busbar assembly 200 may include busbar frame 210 and at least one busbar 220 mounted on busbar frame 210 for electrical connection to cell assembly 100.

[0092] The busbar frame 210 is configured to have a predetermined length along the arrangement direction (X direction) of the plurality of battery cells 110. The predetermined length can be configured to conform to the dimensions of the battery pack housing 500 of the battery pack 10, which will be described later.

[0093] At least one busbar 220 may be connected to the electrode leads 113 of a plurality of battery cells 110, and in this case, the polarity of the electrode leads connected to at least one busbar 220 may be the same or different among the respective connected battery cells 110.

[0094] One or more busbars 220 may be connected to busbar frame 210 so that they can move independently along the length of busbar frame 210.

[0095] The independent movement of one or more busbars 220 can be associated with the movement of the electrode leads 113 of the battery cell 110 connected to the busbar 220. When cell expansion occurs in the battery cell 110, the expansion of the battery cell 110 may apply a large amount of tension to the electrode leads 113 connected to the busbar 220. In this embodiment, the movement of the busbar 220 can minimize the tension applied to the electrode leads 113 between the busbar 220 and the cell housing 114 of the battery cell 110 during cell expansion.

[0096] When cell expansion occurs in the battery pack 10 according to this embodiment, compared with conventional battery packs where the busbars are fixed to the busbar frame by welding or the like, one or more busbars 220 connected to the electrode leads 113 of the battery cells 110 can move independently on the busbar frame 210, thereby sufficiently relieving the tension applied to the electrode leads 113 of the multiple battery cells 110.

[0097] Therefore, in embodiments of this disclosure, during cell expansion, the tension applied to the electrode leads 113 can be reduced by moving the busbar 220 connected to the electrode leads 113, thereby maintaining the stability of the electrical connection. As a result, the long-term durability of the battery pack 10 and the overall reliability of the battery system can be improved.

[0098] According to this embodiment, the busbar frame 210 can be configured as a pair of guide frames 211 arranged in parallel at predetermined intervals. The guide frames 211 can be rod-shaped, and as described later, this structure allows the busbar 220 to slide smoothly between the pair of guide frames 211 along the length of the busbar frame 210. Specifically, the distance between the guide frames 211 can be adjusted to match the dimensions of the busbar 220, ensuring that the busbar 220 is securely fixed while allowing free movement within a certain distance.

[0099] In other words, the busbar frame 210 can be designed to provide a track-like movement path configured as a pair of guide frames 211, so that one or more busbars 220 can slide along the track-like movement path.

[0100] For example, pairs of electrode leads 113 (i.e., electrode leads of the first polarity or electrode leads of the second polarity) disposed in multiple battery cells 110 are arranged in a row parallel to the stacking direction of the cell assembly 100. In this embodiment, the busbar frame 210 can accommodate four busbars 220 that can be connected to one of the electrode leads 113 in a row of the parallel-arranged pairs of electrode leads 113. The four busbars 220 can be mounted to the busbar frame 210 so that they can slide independently in two directions along the length direction of the busbar assembly 200 between a pair of guide frames 211.

[0101] Therefore, the battery pack 10 according to this embodiment can provide a structure that ensures the stable installation of one or more busbars 220 via the slide rail type busbar frame 210.

[0102] Furthermore, since the busbar 220 slides between a pair of guide frames 211, the busbar 220 can be installed into the busbar frame 210 with a simpler structure. Additionally, since the individual busbars 220 are arranged in a straight line relative to the busbar frame 210, space can be maximized within the battery pack 10.

[0103] Next, a detailed connection structure between the cell assembly 100 and the busbar assembly 200 of the battery pack 10 according to an embodiment of the present disclosure will be described.

[0104] Figure 3 It is along Figure 1 A schematic cross-sectional view of battery pack 10 taken by line A-A' in the figure. Figure 4 It is along Figure 1 A schematic cross-sectional view of battery pack 10 taken by line B-B', and Figure 5 It shows the basis Figure 4 A diagram showing the expansion state of multiple battery cells 110 in the battery pack 10.

[0105] Reference Figure 3 and Figure 4 The battery cell 110 may include an electrode assembly 111, electrode tabs 112, a pair of electrode leads 113, and a cell housing 114.

[0106] Electrode assembly 111 is configured such that positive and negative plates are stacked alternately, with a diaphragm inserted between the positive and negative plates. Electrode tabs 112 are connected to their respective electrode plates according to their polarity, and protrude from electrode assembly 111. Electrode tabs 112 may include a positive tab 1121 and a negative tab 1122.

[0107] Multiple electrode tabs 112 protruding from the electrode assembly 111 can be pulled, gathered, and compressed at a certain angle, and then welded to the electrode leads 113. That is to say, when the battery cell expands, the weld between the electrode leads 113 and the multiple electrode tabs 112 is easily affected by stress and is very prone to breakage.

[0108] A pair of electrode leads 113 can be respectively connected to a positive electrode tab 1121 and a negative electrode tab 1122 connected to the electrode assembly 111. The electrode lead 113 connected to the positive electrode tab 1121 serves as a positive electrode lead 1131 with a first polarity, and the electrode lead 113 connected to the negative electrode tab 1122 serves as a negative electrode lead 1132 with a first polarity. At least a portion of the electrode leads 113 can protrude outside the cell housing 114.

[0109] As described above, the cell housing 114 can be a pouch-type housing. Here, the pouch-type housing can typically be constructed as an inner / metal layer / outer layer laminate. Here, the inner layer, which is in direct contact with the electrode assembly 111, can have insulating properties and resistance to electrolytes. Furthermore, for external sealing, the heat-bonded sealing portion of the inner layer can have excellent heat-bonding strength.

[0110] from Figure 3 The protruding electrode leads 113 of the cell housing 114 of each battery cell 110 shown can be connected to the aforementioned busbar 220.

[0111] Busbar 220 can be made of a conductive metal such as copper, silver, tin, or copper plating, and can safely conduct current. Electrode leads 113 can be tightly attached and soldered to busbar 220 for electrical connection. Furthermore, busbar frame 210, which provides a path for movement of busbar 220, can be made of an insulating material to provide electrical insulation.

[0112] Paired electrode leads 113 disposed in multiple battery cells 110 are arranged in a row parallel to the stacking direction (X direction) of the multiple battery cells 110.

[0113] In this configuration, the cell assembly 100 can be grouped into groups, each comprising some of the plurality of battery cells 110. Electrode leads 113 arranged in a row within the same group can be attached to the same busbar 220 by welding or the like. Furthermore, at least some of the electrode leads 113 arranged in a different row within another group can be attached to the same busbar 220 by welding or the like. As a result, the cell assembly 100 can be configured to conduct current throughout the entire configuration.

[0114] Some of the electrode leads 113 connected to the same busbar 220 within the same group can be configured as positive leads 1131, while the rest can be configured as negative leads 1132.

[0115] As an example, the battery pack 10 may include a cell assembly 100 comprising a plurality of battery cells 110 arranged in a row, each battery cell having both a positive electrode lead 1131 and a negative electrode lead 1132 disposed on one side of the cell housing 114. In this case, the positive electrode lead 1131 or the negative electrode lead 1132 is arranged in a row parallel to the stacking direction (X direction) of the plurality of battery cells 110. Four of the plurality of battery cells 110 may form a group, and within the same group, arranged in a row and connected to the same busbar 220, two electrode leads 113 may be configured as positive electrode leads 1131, and the remaining two electrode leads 113 may be configured as negative electrode leads 1132. That is, in this structure, the two positive electrode leads 1131 and the two negative electrode leads 1132 of the four battery cells 110 are connected in parallel. Specifically, the positive leads 1131 of the two battery cells 110 can overlap, and the negative leads 1132 of the other two battery cells can also overlap, and these leads are tightly attached and welded to both sides of a single busbar 220 in order to conduct current.

[0116] The number of battery cells 110 included in a single group can be determined by taking into account the number of battery cells 110 and the capacity of the battery cells 110. Furthermore, depending on the series and parallel connection relationship of the multiple battery cells 110, the number and polarity of the electrode leads 113 connected to a single busbar 220 may differ from those illustrated herein.

[0117] Each electrode lead 113 may have a width a1 smaller than the width a2 of the connected busbar 220. With this configuration, the electrode leads 113 can be stably soldered to the busbar 220 while avoiding physical contact with the busbar frame 210. Therefore, free movement of the busbar 220 within the busbar frame 210 can be ensured, thereby maintaining the electrical connection between the electrode leads 113 and the busbar 220 while providing structural flexibility.

[0118] Furthermore, the length of the electrode lead 113 protruding from the cell housing 114 can be configured to be longer than the distance between the cell housing 114 of the battery cell 110 and the busbar frame 210. According to this configuration, the tension applied to the electrode lead 113 in the space between the busbar frame 210 and the cell housing 114 can be minimized during cell expansion.

[0119] Furthermore, among the multiple electrode leads 113 connected to the same busbar 220, the outermost electrode lead 113 can be designed to have a greater length than the other electrode leads 113 located in between. This is because, when cell expansion occurs, the outermost electrode lead 113 may experience the greatest positional change due to the movement of the busbar 220, and is therefore most likely to be subjected to the greatest mechanical stress and deformation.

[0120] Furthermore, the length of the electrode leads 113 of the plurality of battery cells 110 can be configured to increase from the center C of the plurality of battery cells 110, including the electrode leads 113 connected to the same busbar 220, toward the outermost side.

[0121] The electrode lead 113 can be bent at least once outside the cell housing 114 of the battery cell 110 to ensure sufficient length within the space between the cell housing 114 and the busbar frame 210, and the electrode lead 113 can be arranged undisturbed in a manner such as tangling or twisting relative to adjacent leads 113. Therefore, when the battery cell 110 expands due to cell expansion, the bent portion of the electrode lead 113 can be at least partially straightened, thereby effectively minimizing the cell expansion force applied to the electrode lead 113. Thus, the risk of the electrode lead 113 detaching from the busbar 220 or breaking at the junction between the electrode lead 113 and the electrode tab 112 during cell expansion can be effectively prevented.

[0122] The bent portion of the electrode lead 113 can be disposed in the space between the cell housing 114 of the battery cell 110 and the busbar frame 210. This allows the busbar 220 to move along its length on the busbar frame 210 without being obstructed when the battery cell 110 expands due to cell expansion.

[0123] Furthermore, among the multiple electrode leads 113 connected to the same busbar 220, the outermost electrode lead 113 can be bent more than the other electrode leads 113, and the number of bends gradually increases from the center C of the multiple battery cells 110, including the electrode leads 113 connected to the same busbar 220, towards the outermost side. Therefore, by increasing the additional length of the electrode lead 113 that undergoes the greatest displacement due to pressure deformation during cell expansion, the durability of the battery pack 10 can be effectively improved.

[0124] Furthermore, the electrode leads 113 connected to the same busbar 220 can be configured to be bent into a shape that partially protrudes towards the center C. This configuration prevents interference or collisions between the electrode leads 113 connected to the multiple busbars 220 mounted to the busbar frame 210 that may occur when the busbars 220 move independently. In other words, since the electrode leads 113 are configured to bend towards the center C, the bent portions of the electrode leads 113 will not collide with each other when the individual busbars 220 move on the busbar frame 210.

[0125] Furthermore, the electrode leads 113 connected to the same busbar 220 can be arranged symmetrically with respect to the center portion C. This can reduce the stress applied to specific parts, thereby minimizing the risk of damage or breakage that may occur at the joints between the electrode tabs 112, the electrode leads 113, and the busbar 220.

[0126] Reference Figure 5 At least some of the multiple electrode leads 113 connected to the same busbar 220 can move in the expansion direction, which causes the total width of the cell assembly 100 to increase due to the expansion of the battery cell 110 caused by cell expansion. At this time, the tension generated by the partial unfolding of the bent portion of the electrode lead 113 is also transmitted to the busbar 220 connected to the relevant electrode lead 113, causing the busbar 220 to move along the length direction of the busbar frame 210, specifically along the expansion direction.

[0127] Therefore, when the battery cell 110 expands due to the gas generated inside the battery cell 110 in the battery cell assembly 100 caused by overcharging, overheating, external impact, etc., the mechanical stress applied to the electrode lead 113 can be effectively reduced.

[0128] Therefore, the battery pack 10 according to this embodiment can prevent damage to the electrical connection between the busbar 220 and the electrode lead 113 during cell expansion and disperse the stress applied to the electrode lead 113, thereby preventing damage or disconnection of the welding or electrical connection between the electrode tab 112 and the electrode lead 113.

[0129] The specific component structure of the busbar assembly 200 according to various embodiments of the present disclosure will be described in detail below.

[0130] Figure 6 It is a schematic representation based on Figure 1 Exploded perspective view of the busbar assembly 200 of the battery pack 10. Figure 7 It shows the basis Figure 6 A diagram of the component structure of the busbar assembly 200, and Figure 8 It is along Figure 7A schematic cross-sectional view of the busbar assembly 200 taken by line C-C'.

[0131] Reference Figures 6 to 8 According to embodiments of the present disclosure, the busbar assembly 200 of the battery pack 10 may include at least one separator 230.

[0132] Multiple busbars 220 can be provided, and the multiple busbars 220 can be spaced apart from each other at a predetermined distance along the length direction of the busbar frame 210. In this case, one or more separators 230 can be formed between the busbars 220 and can be spaced apart from the adjacent busbars 220 by a predetermined distance.

[0133] Therefore, the separator 230 is used to limit the range of movement of each busbar 220 within the busbar frame 210. As a result, the movement space can be divided according to the number of busbars 220, thereby ensuring that the independent movement of the busbars 220 does not interfere with each other.

[0134] Therefore, the battery pack 10 according to this embodiment can effectively suppress physical damage or disconnection that may occur at the welding or electrical connection between the electrode tabs 112 and the electrode leads 113 by preventing excessive movement of the busbar 220. Thus, the stability of the electrical connections of the battery pack 10 can be maintained, while improving the long-term reliability and durability of the battery system.

[0135] The separator 230 can be directly installed onto the busbar frame 210.

[0136] Specifically, the busbar frame 210 may include a first longitudinal end 2113 and a second longitudinal end 2114 disposed at both ends in the length direction of the busbar frame 210, and a groove 2111 formed on a surface of the busbar frame 210.

[0137] The groove 2111 of the busbar frame 210 can be continuously formed along the length direction of the busbar frame 210 from the first longitudinal end 2113 to the second longitudinal end 2114 in such a way that it is recessed from one surface of the busbar frame 210 to a predetermined depth.

[0138] The separator 230 may include a connecting portion 231, which is configured to be inserted into a groove 2111 of the busbar frame 210 and is slidable along the length of the busbar frame 210.

[0139] As a result, the separator 230 offers the structural advantage of being able to be installed onto the busbar frame 210 without the need for separate connecting members or additional fixing devices. Furthermore, since the separator 230 is designed to slide on the busbar frame 210, simple and efficient movement and placement are possible without complex moving mechanisms.

[0140] As described above, the busbar frame 210 can be configured as a pair of guide frames 211, and the connecting portion 231 of the separator 230 can be configured to protrude a predetermined length from one surface of the separator 230 and another surface disposed on the opposite side, and is configured to be inserted into the grooves on both sides.

[0141] Specifically, the separator 230 can be designed to minimize structural interference with the busbar frame 210. The separator 230 can be designed with a length that maintains an appropriate ratio relative to the length of the busbar frame 210, allowing it to slide into the groove 2111 of the busbar frame 210. Furthermore, the shape of the connecting portion 231 of the separator 230 can be designed to correspond to the shape of the groove 2111 of the busbar frame 210. Additionally, the thickness of the separator 230 is configured to ensure smooth sliding of the busbar 220 within the movement space of the busbar frame 210, and to prevent the movement of the busbar 220 from being restricted due to excessive thickness.

[0142] In this case, the heights of the separator 230 and the busbar frame 210 in the Z-axis direction may be the same or different, and are not limited to the exemplary shapes shown in the figures.

[0143] The busbar frame 210 may have at least one fixing part 2112 with a through hole of a predetermined size.

[0144] The fixing part 2112 can be used to fix the position of the separator 230 to the busbar frame 210, thereby maximizing structural stability. For example, the connecting part 231 of the separator 230 can be firmly fixed to the groove 2111 in the busbar frame 210 by welding or bolting through the fixing part 2112. As a result, even when the busbar 220 moves due to the expansion of the battery cell 110 or when an external impact is applied, the position of the separator 230 can be precisely controlled in the busbar frame 210.

[0145] Although the structure in which the connecting portion 231 of the separator 230 is inserted into the groove 2111 of the busbar frame 210 has been described by way of example in this specification and accompanying drawings, the present disclosure is not limited thereto. For example, alternative structures are also possible, wherein a protrusion is formed in the busbar frame 210 itself and the protrusion is inserted into the groove formed in the separator 230. Such variant structures can be implemented in various ways according to design purposes, and the connection between the separator 230 and the busbar frame 210 can be freely changed according to technical requirements and manufacturing process efficiency.

[0146] Figure 9 It is a schematic representation based on Figure 6An exploded perspective view of a busbar assembly 201 according to another embodiment. Figure 10 It shows the basis Figure 9 A diagram of the component structure of the busbar component 201, and Figure 11 It is a schematic representation of the path along Figure 10 The cross-sectional view of the busbar assembly 201 taken by line E-E' in the figure.

[0147] Reference Figures 9 to 11 According to embodiments of the present disclosure, the busbar assembly 201 of the battery pack 10 may include at least one separator 230a. Here, as shown in reference... Figures 6 to 8 The configuration shared by the partitions 230 and 230a described herein can also be applied to the partition 230a, and its redundant description will be omitted.

[0148] The separator 230a can be configured as a simple bar and can be directly mounted to the busbar frame 210, enabling simple and efficient assembly.

[0149] The busbar frame 210 may have one or more recesses 2115 recessed from a surface to a predetermined depth, and the spacer 230a may be inserted into the recesses 2115 for fixation.

[0150] The separator 230a can be directly inserted into the recess 2115 of the busbar frame 210 from the outside, thereby improving installation flexibility and work efficiency. For example, the separator 230a can be inserted from top to bottom into the recess 2115 formed to a predetermined depth on the upper surface of the busbar frame 210, enabling immediate installation without complex assembly procedures or interference between components. This structure eliminates the need to position the separator 230a relative to other components on the frame and allows workers to easily insert the separator from the outside, thereby simplifying the assembly process and reducing labor costs.

[0151] Furthermore, since the structure can be directly inserted from the outside, various reinforcement methods such as welding or bolting are allowed, which can ensure a firm and secure state after installation and improve assembly efficiency.

[0152] Figure 12 It is a schematic representation of the path along Figure 7 A cross-sectional view of the busbar assembly 200 taken by line D-D' in the diagram, and Figure 13 It is a schematic representation based on Figure 12 A cross-sectional view of another embodiment of the busbar assembly 200.

[0153] Reference Figure 12 and Figure 13 And the previously discussed Figure 6 and Figure 7The busbar frame 210 may include the groove 2111 as described above.

[0154] The busbar 220 may include a connecting portion 221, which is configured to be inserted into a groove 2111 of the busbar frame 210 and is slidable along the length of the busbar frame 210.

[0155] Therefore, the busbar 220 offers the structural advantage of being able to be installed onto the busbar frame 210 without the need for separate connecting members or additional fixing devices. Furthermore, since the busbar 220 is designed to slide on the busbar frame 210, simple and efficient movement and placement are possible without complex moving mechanisms.

[0156] As described above, the busbar frame 210 can be configured as a pair of guide frames 211, and the connecting portion 221 of the busbar 220 can be configured to protrude a predetermined length from one surface of the busbar 220 and another surface disposed on the opposite side, and is configured to be inserted into the grooves on both sides.

[0157] Specifically, the busbar 220 can be designed to minimize structural interference with the busbar frame 210. The busbar 220 can be designed to have a length that maintains an appropriate ratio relative to the length of the busbar frame 210, so as to be slidably inserted into the groove 2111 of the busbar frame 210. Furthermore, the shape of the connecting portion 221 of the busbar 220 can be designed to correspond to the shape of the groove 2111 of the busbar frame 210.

[0158] In this case, the heights of the busbar 220 and the busbar frame 210 in the Z-axis direction may be the same or different, and are not limited to the exemplary shapes shown in the figures.

[0159] The shapes of the connecting portion 221 of the busbar 220 and the groove 2111 of the busbar frame 210 can be designed differently and are not limited to the exemplary shapes presented in this disclosure. Specifically, the connecting portion 221 of the busbar 220 can have various geometries, and the groove 2111 of the busbar frame 210 can also be modified to have various depths, widths, and shapes capable of interlocking with the connecting portion 221 of the busbar 220. For example, as Figure 12 As shown, the connecting portion 221 of the busbar 220 and the groove 2111 of the busbar frame 210 can be designed in a square shape. Furthermore, as... Figure 13 As shown, the connecting portion 221 of the busbar 220 and the groove 2111 of the busbar frame 210 can be designed in a curved shape. This can be modified according to the structural requirements of the battery pack 10 or the optimization of the manufacturing process.

[0160] As an example, at least one of the connector 221 of the busbar 220 and the groove 2111 of the busbar frame 210 can be configured as a curved surface. This curved surface facilitates insertion and removal of the joint, thereby simplifying the assembly process and improving operator convenience. Furthermore, the curved surface promotes natural alignment during insertion, thus reducing component position errors during manual assembly.

[0161] This degree of design freedom allows for optimization based on system requirements, and various modifications can be made considering structural stability, electrical performance, manufacturing efficiency, and other factors.

[0162] Similarly, although this specification and drawings show the structure in which the connecting portion 231 of the separator 230 is inserted into the groove 2111 of the busbar frame 210, this disclosure is not limited thereto.

[0163] Figure 14 It shows the basis Figure 6 A diagram showing the component structure of the finishing portion 240 of the busbar assembly 200, and... Figure 15 It is a schematic representation of the path along Figure 14 The cross-sectional view of the end portion 240 of the busbar assembly 200 taken by line F-F'.

[0164] Reference Figure 14 and Figure 15 as well as Figure 7 According to the description, the busbar assembly 200 according to this embodiment may include an end portion 240.

[0165] The end portion 240 can be configured to make surface contact with at least one of the first longitudinal end portion 2113 and the second longitudinal end portion 2114 of the busbar frame 210.

[0166] The end portion 240 can be designed to connect to one or more ends of the busbar frame 210, thereby helping to maintain a constant movement space for one or more busbars 220 disposed in the busbar frame 210. As a result, even in the event of external impact or vibration, the overall structural deformation of the busbar frame 210 can be minimized by fixing at least one of the first longitudinal end portion 2113 and the second longitudinal end portion 2114 of the busbar frame 210.

[0167] Specifically, as described above, the busbar frame 210 can be configured with a pair of guide frames 211 arranged in parallel at predetermined intervals. In this case, the predetermined distance can be maintained by the end portions 240, thereby further enhancing the structural stability of the busbar frame 210.

[0168] The end portion 240 can be configured as a strip or a "U" shape, and this design can improve structural stability and maximize functional efficiency. The end portion 240 may include at least one protrusion 241 projecting from a surface and an elastic portion 242 connected to the end of the protrusion 241.

[0169] The protrusion 241 of the end portion 240 can be configured to forcibly fit into an insertion portion 2116 formed on at least one of the first longitudinal end portion 2113 and the second longitudinal end portion 2114 of the busbar frame 210, thereby ensuring a stable and secure connection. For example, two protrusions 241 can be formed on each of the opposite side edges of one surface of the end portion 240, and two insertion portions 2116 can be provided on at least one of the first longitudinal end portion 2113 and the second longitudinal end portion 2114 of the busbar frame 210 so that they can engage with each other. This configuration can enhance the connection between the longitudinal ends 2113 and 2114 of the busbar frame 210 and the end portion 240, thereby maintaining stability even under external forces or vibrations.

[0170] The cross-sectional area of ​​the elastic portion 242 of the end portion 240 can be larger than the cross-sectional area of ​​the protrusion 241 of the end portion 240.

[0171] In other words, the elastic portion 242 of the end portion 240 can be made of an elastic material so that its shape can deform under external force, thus allowing it to be stably assembled into the insertion portion 2116 without the need for a separate fixing member. For example, the elastic portion 242 of the end portion 240 can have a width c2 larger than the width c1 of the protrusion 241 of the end portion 240. Furthermore, the width d1 of the first end 2116a of the insertion portion 2116 can be configured to be equal to the width c1 of the protrusion 241 of the end portion 240, and the width d2 of the second end 2116b of the insertion portion 2116 can be configured to be equal to the width c2 of the elastic portion 242 of the end portion 240. Therefore, since the shapes of the protrusion and the concave portion correspond to each other, the busbar frame 210 and the end portion 240 can be securely fixed, while reducing the number of parts such as separate fastening members, thereby reducing the overall weight.

[0172] Figure 16 It is a schematic representation of the path along Figure 1 A cross-sectional view of another example of battery pack 10 taken by line B-B', and Figure 17 It is a schematic representation based on Figure 16 Perspective view of busbar 220a.

[0173] Reference Figure 16 and Figure 17The busbar 220a may be arranged along the length of the busbar frame 210 (particularly the guide frame 211) and may have a curved portion 222 configured to be concave in at least a portion of the side surface not connected to the busbar frame 210 or 211. Here, as referenced Figures 1 to 13 The configuration shared by busbar 220 and busbar 220a described herein can also be applied to busbar 220a, and its redundant description will be omitted.

[0174] The busbar 220a may have a connecting portion 221a configured to insert into a groove 2111 in the busbar frame 210 and be able to slide along the length of the busbar frame 210. This provides the structural advantage of being able to install onto the busbar frame 210 without the need for separate connecting members or additional fixing devices. Furthermore, since the connecting portion 221a is designed to slide on the busbar frame 210, simple and efficient movement and placement are possible without complex moving mechanisms.

[0175] A bend 222 can be formed on the side surface of the busbar 220a between the connecting portions 221a. The electrode lead 113 can be configured to bend naturally along the concave shape formed in the bend 222 of the busbar 220a. During manufacturing, this concave shape can be precisely formed using a busbar pressing device or forming equipment. That is, the electrode lead 113 can be bent slowly inward toward the busbar 220a along the concave shape of the bend 222, thereby promoting the electrical connection between the electrode lead 113 and the busbar 220a and ensuring sufficient space to accommodate deformation caused by the expansion of the battery cell 110 or external impact.

[0176] Therefore, even if the bend in the electrode lead 113 is not necessarily formed between the cell housing 114 and the busbar frame 210, the electrode lead 113 can still ensure the extra length of the electrode lead without interfering with the movement path of the busbar 220a on the busbar frame 210.

[0177] Therefore, the battery pack 10 according to this embodiment can make efficient use of space in relation to the electrode leads 113 and the busbar assembly 200, while flexibly responding to deformation caused by cell expansion or external impact.

[0178] Return to reference Figure 1 and Figure 2 The cell assembly 100 can be a bidirectional lead-out battery cell in which the first polarity electrode lead 113 and the second polarity electrode lead 113 extend outward in opposite directions. The first polarity electrode lead can be a positive electrode lead 1131, and the second polarity electrode lead can be a negative electrode lead 1132, and vice versa.

[0179] Alternatively, the cell assembly 100 may be a unidirectional lead-out battery cell in which the first polarity electrode lead 113 and the second polarity electrode lead 113 provided for each battery cell 110 extend in the same direction. Similarly, the first polarity electrode lead may be a positive lead 1131, and the second polarity electrode lead may be a negative lead 1132, and vice versa. That is, in this case, the cell assembly 100 may be configured such that the side of each battery cell 110 is placed on the ground, such that a pair of electrode leads 113 extend in a direction perpendicular to the ground (Z direction).

[0180] As an example, the cell assembly 100 may also include at least one buffer section 120 located between a plurality of battery cells 110 arranged in a row.

[0181] The buffer section 120 can be inserted between adjacent battery cells 110 and can be provided between groups of battery cells 110 connected to the same busbar 220 in order to minimize the increase in thickness of the cell assembly 100.

[0182] Furthermore, the buffer portion 120 may be formed of an elastic material capable of absorbing expansion when cell expansion occurs and the battery cell 110 expands along the stacking direction (X direction) of the battery cell 110. For example, the buffer portion 120 may include at least one of EPP (expanded polypropylene) and polyurethane. Therefore, the buffer portion 120 can stably absorb the volume expansion caused by the expansion of the battery cell 110.

[0183] The busbar frame 210 can be disposed on at least one side of the cell assembly 100. For example, when a pair of electrode leads 113 extend in opposite directions, the busbar frame 210 can be disposed on both sides of the cell assembly 100, i.e., on the lateral side of the cell assembly 100.

[0184] Furthermore, when a pair of electrode leads 113 extend in the same direction, the busbar frame 210 can be disposed on one side of the cell assembly 100, that is, on the upper side of the cell assembly 100.

[0185] In addition, the battery pack 10 disclosed herein may include a battery pack housing 500.

[0186] The battery pack housing 500 can accommodate a cell assembly 100, which includes a plurality of battery cells 110 arranged in at least one row within an internal accommodating space, thereby eliminating intermediate module steps. In other words, the cell assembly 100 can be located inside the battery pack housing 500.

[0187] Therefore, this disclosure enables the battery pack 10 to be implemented as a so-called CTP (cell-to-pack) structure.

[0188] In the following text, reference will be made to Figures 18 to 22 The structure of battery packs 20, 30 and 40 according to various embodiments of the present disclosure is described.

[0189] Here, as referenced Figures 1 to 17 The common configuration of battery pack 10 and battery packs 20, 30 and 40 described herein can also be applied to battery packs 20, 30 and 40, and their redundant description will be omitted.

[0190] Battery packs 10, 20, 30, and 40 according to embodiments of this disclosure may also include various other battery pack components known at the time of filing of this disclosure. For example, battery packs 10, 20, 30, and 40 according to embodiments of this disclosure may also include components such as current sensors, fuses, and service plugs. Furthermore, battery packs 10, 20, 30, and 40 may include two upwardly extending terminal connections 250 from two of a plurality of busbars 220 or 220a. The terminal connections 250 may have bolt-type external input / output terminals (not shown) to ensure stable power input / output.

[0191] Figure 18 This is a schematic diagram of a battery pack 20 according to another embodiment of the present disclosure, and Figure 19 It is fixed according to Figure 18 A schematic diagram of the battery pack housing 500 and the bracket 300 of the battery pack 20.

[0192] Reference Figure 18 and Figure 19 and the above Figure 1 As described herein, battery pack 10 or 20 may include a battery pack housing 500 forming the exterior of battery pack 10 or 20 and forming receiving space therein. This configuration is also applicable to battery packs 30 and 40 according to other embodiments discussed later and described herein.

[0193] Specifically, the battery pack housing 500 may include a base plate 510, a side plate 520, an end plate 530, and a cover plate (not shown).

[0194] The base plate 510 can form the lower surface of the battery pack housing 500. That is, the base plate 510 can be positioned at its lowest point. The side plates 520 and end plates 530 can be configured to cover the left / right and front / rear sides of the cell assembly 100 along the periphery of the base plate 510, respectively. The lower ends of the side plates 520 and end plates 530 can be connected to the base plate 510. In addition, a cover plate can be configured to cover the upper parts of the side plates 520 and end plates 530.

[0195] Reference Figure 18 and Figure 19In the battery pack 20 according to this embodiment, the busbar frame 210 can be fixed to the battery pack housing 500, such as the side plate 520. As a result, the busbar frame 210 can be fixed, allowing only the busbars 220 or 220a to move independently according to cell expansion.

[0196] As an example, the two longitudinal ends of the busbar frame 210 can be fixed to the side plate 520.

[0197] To enhance this fixation, one or more brackets 300 can be installed at both longitudinal ends of the busbar frame 210. Here, the bracket 300 can be a component with a bend. Furthermore, although the bracket 300 is shown as being fixed by bolts, it is not limited to this and can have various fixing structures.

[0198] Therefore, the fixing strength of the side plate 520 and the busbar frame 210 can be further enhanced, ensuring the stability of the overall structure and significantly improving the resistance to external impacts or vibrations.

[0199] Figure 20 This is a schematic diagram of a battery pack 30 according to another embodiment of the present disclosure.

[0200] Reference Figure 20 According to this embodiment, the battery pack 30 may include a frame support plate 400 disposed between a pair of busbar frames 210.

[0201] The frame support plate 400 can be formed in the shape of a plate and is configured to secure the various busbar frames 210 from the sides, thereby supporting the entire structure. This enhances the stability of the busbar frames 210 and ensures that electrical connections and mechanical components within the battery pack 30 are securely held. Furthermore, the frame support plate 400 serves as a support for the stable mounting of various electrical components such as the battery management system (BMS), cooling system, and sensors, thereby maximizing the use of space within the battery pack 30 while providing a high-strength structure. In particular, since the electrical components are secured by the frame support plate 400, damage caused by vibration or external impact is prevented, and convenience is improved during maintenance or component replacement.

[0202] Figure 21 This is a schematic diagram of a battery pack 40 according to another embodiment of the present disclosure, and Figure 22 It shows the basis Figure 21 The image shows the protective pad for the 40 battery pack and the 600 battery pack.

[0203] Reference Figure 21 and Figure 22 The battery pack 40 according to this embodiment may include a protective pad 600.

[0204] A protective pad 600 can be disposed between the cell assembly 100 and the busbar assembly 200 or 201 to prevent physical collision between the battery cell 110 and the busbar 220 or 220a caused by the movement of the busbar 220 or 220a when the battery cell 110 expands. This reduces direct contact or friction between the battery cell 110 and the busbar 220 or 220a and prevents damage to electrical connections or structural components. Therefore, the durability and stability of the battery pack 40 can be further improved.

[0205] However, the protective pad 600 can be designed to have an appropriate thickness so as not to impede the movement of the busbar 220 or 220a, especially ensuring mobility even when it is positioned around the electrode lead 113. Therefore, the protective pad 600 can prevent physical impacts due to cell expansion while allowing free movement of the busbar 220 or 220a and the electrode lead 113, thereby maintaining the electrical connection of the battery pack 40 and achieving stable operation without performance degradation.

[0206] Figure 23 The diagram schematically illustrates a vehicle V including battery packs 10, 20, 30, or 40 according to the above embodiments.

[0207] Reference Figure 23 A vehicle V according to an embodiment of the present disclosure may include one or more battery packs 10, 20, 30, or 40 according to the present disclosure. In addition to battery packs 10, 20, 30, or 40, a vehicle V according to an embodiment of the present disclosure may also include various other components included in a vehicle. For example, in addition to battery packs 10, 20, 30, or 40 according to an embodiment of the present disclosure, a vehicle V according to an embodiment of the present disclosure may also include a body, a motor, and control devices such as an electronic control unit (ECU).

[0208] Furthermore, the battery packs 10, 20, 30 or 40 according to embodiments of this disclosure can be applied to various types of energy storage devices or power sources, and can be applied to other devices, equipment and facilities that use secondary batteries, such as energy storage systems, in addition to the vehicle V.

[0209] As described above, although this disclosure is described with reference to limited embodiments and drawings, it is not limited thereto, and those skilled in the art to which this disclosure pertains can make various modifications and variations without departing from the technical concept of this disclosure and the equivalents of the claims described below.

[0210] [Explanation of reference numerals in the attached figures]

[0211] 10, 20, 30, 40: Battery pack

[0212] 100: Battery cell assembly

[0213] 110: Battery Cells

[0214] 111: Electrode Assembly

[0215] 112: Electrode tabs

[0216] 1121: Positive electrode tab

[0217] 1122: Negative electrode tab

[0218] 113: Electrode leads

[0219] 1131: Positive lead

[0220] 1132: Negative lead

[0221] 114: Cell casing

[0222] 120: Buffer section

[0223] 200, 201: Busbar Components

[0224] 210: Busbar Frame

[0225] 211: Bootstrap Framework

[0226] 2111: Groove

[0227] 2112: Fixing part

[0228] 2113: First longitudinal end

[0229] 2114: Second longitudinal end

[0230] 2115: concave part

[0231] 2116: Insertion section

[0232] 2116a: First end

[0233] 2116b: Second end

[0234] 220, 220a: Busbar

[0235] 221, 221a: Connecting parts

[0236] 222: Bend

[0237] 230, 230a: Separator

[0238] 231: Connecting part

[0239] 240: terminal part

[0240] 241: Protrusion

[0241] 242: Elastic part

[0242] 250: Terminal connection part

[0243] 300: Bracket

[0244] 400: Frame support plate

[0245] 500: Battery pack casing

[0246] 510: Base Plate

[0247] 520: Side panel

[0248] 530: End plate

[0249] 600: Protective pad

[0250] V: Vehicle

[0251] W: Welding

Claims

1. A battery pack, the battery pack comprising: A battery cell assembly, the battery cell assembly comprising at least a plurality of battery cells arranged in a row; as well as Busbar assembly, the busbar assembly being electrically connected to the cell assembly, The busbar assembly includes: A busbar frame having a predetermined length and arranged along the arrangement direction of the plurality of battery cells; and At least one busbar is connected to the electrode leads of the plurality of battery cells and is mounted to the busbar frame so as to be able to move independently along the length of each busbar frame.

2. The battery pack according to claim 1, in, The busbar frame is configured as a pair of guide frames arranged in parallel at predetermined intervals, and The at least one busbar is configured to slide between the pair of guide frames along the length direction of the busbar frame.

3. The battery pack according to claim 1, in, The width of the electrode lead is smaller than the width of the busbar, and the electrode lead is soldered to the busbar so as not to contact the busbar frame.

4. The battery pack according to claim 1, in, The outermost electrode lead among the multiple electrode leads connected together to the busbar is longer than the length of the electrode leads between the outermost electrode leads.

5. The battery pack according to claim 1, in, The electrode lead is bent at least once, and At least some of the multiple electrode leads connected together to the busbar are configured such that the bent portions of the electrode leads are partially straightened by the movement of the busbar due to the expansion of the battery cell.

6. The battery pack according to claim 5, in, The bent portion of the electrode lead is located in the space between the battery cell housing and the busbar.

7. The battery pack according to claim 5, in, The plurality of electrode leads connected together to the busbar are bent toward the center of the plurality of electrode leads.

8. The battery pack according to claim 1, in, The busbars are configured as a plurality of busbars, and the plurality of busbars are configured to be spaced apart from each other at a predetermined distance along the length direction of the busbar frame. The busbar assembly includes at least one spacer configured to be spaced apart from each busbar by a predetermined distance between adjacent busbars.

9. The battery pack according to claim 8, in, The busbar frame includes: A first longitudinal end and a second longitudinal end, the first longitudinal end and the second longitudinal end being disposed at both ends of the busbar frame in the length direction; and A groove, the groove being formed to be recessed along the length direction of the busbar frame from one surface of the busbar frame to a predetermined depth and extending from the first longitudinal end to the second longitudinal end, and The separator has a connecting portion that is inserted into the groove and is capable of sliding along the length direction of the busbar frame.

10. The battery pack according to claim 8, in, The busbar frame includes at least one fixing part with a through hole of a predetermined size, and The separator is fixed to the busbar frame by the fixing part.

11. The battery pack according to claim 8, in, The busbar frame includes at least one recess formed to be recessed from one surface of the busbar frame to a predetermined depth, and The separator is configured to be inserted into the recess and fixed in position.

12. The battery pack according to claim 1, in, The busbar frame includes: A first longitudinal end and a second longitudinal end, the first longitudinal end and the second longitudinal end being disposed at both ends of the busbar frame in the length direction; and A groove, the groove being formed to be recessed along the length direction of the busbar frame from one surface of the busbar frame to a predetermined depth and extending from the first longitudinal end to the second longitudinal end, and The busbar includes a connecting portion that is inserted into the groove and is capable of sliding along the length direction of the busbar frame.

13. The battery pack according to claim 12, in, The busbar assembly is configured such that at least one of the connecting portion of the busbar and the groove of the busbar frame forms a curved surface.

14. The battery pack according to claim 12, in, The busbar assembly includes an end portion configured to make surface contact with at least one of the first longitudinal end portion and the second longitudinal end portion.

15. The battery pack according to claim 14, in, The terminal portion includes: At least one protrusion, said at least one protrusion projecting from one surface of said end portion; and An elastic portion, which is connected to the end of the protrusion and is made of an elastic material with a cross-sectional area larger than that of the protrusion, and The protrusion and the elastic portion are fitted into an insertion portion formed in either the first longitudinal end or the second longitudinal end.

16. The battery pack according to claim 5, in, The busbar is arranged along the length direction of the busbar frame, and at least a portion of the side surface of the busbar not connected to the busbar frame has a concave shape. The electrode lead is bent along the concave shape.

17. The battery pack according to claim 1, in, The cell assembly includes at least one buffer section disposed between the plurality of battery cells.

18. A vehicle comprising at least one battery pack according to any one of claims 1 to 17.

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