Battery pack and vehicle comprising same

Abstract

The present invention provides a battery pack capable of preventing a tab disconnection problem due to swelling of battery cells, and a vehicle comprising same, and comprises: a cell assembly including a plurality of battery cells arranged in at least one line; and a bus bar assembly electrically connected to the cell assembly, wherein the bus bar assembly includes: bus bar frames provided in a predetermined length in the arrangement direction of the plurality of battery cells; and at least one bus bar connected to electrode leads of the plurality of battery cells and mounted on the bus bar frames to be movable in the longitudinal direction of each bus bar frame.

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 capable of preventing tap disconnection due to swelling of a battery cell and an automobile including the same.

[0002] This application is a priority application for Korean Patent Application No. 10-2024-0150941 filed on October 30, 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, techniques such as increasing the number and size of electrode tabs and leads have been applied to adapt to high-capacity environments for secondary batteries. However, simply increasing the number and / or size of electrode tabs and leads alone makes it difficult to guarantee a stable and reliable connection between them. Furthermore, as the number and / or size of electrode tabs and leads increase, particularly in pouch-type secondary batteries, there is a problem where electrode tabs may break due to load during the electrode tab and lead welding process.

[0006] Here, the electrode assembly consists of alternating positive and negative electrode plates. The positive and negative electrode plates are separated by a separator. Electrode tabs are connected to these plates according to their respective polarities. Leads are welded to the stack of electrode tabs where they are assembled.

[0007] Conventionally, the starting position of the electrode tab stacking section is located very close to the electrode assembly, and the welding position of the electrode tab and the lead is also located very close to the electrode assembly. Consequently, the part of the electrode tab protruding from the electrode assembly is inclined at a steep angle and pulled taut, making it highly vulnerable to stress. When a load is applied to that part during welding, a problem arises where a wire breaks. Furthermore, in this structure, as the overall width of the cell assembly increases due to swelling of the battery cells during use, significant tension is placed on the welded lead portion. As a result, the electrode tab portion, which is inclined at a steep angle and pulled taut, may break.

[0008] Therefore, it is necessary to develop a battery pack with a structure that prevents the electrode tab from becoming disconnected even if swelling occurs due to battery use.

[0009] Accordingly, the technical problem to be solved by the present invention is to provide a battery pack having a structure capable of improving the bonding stability of the electrode lead and the electrode tab, and an automobile including the same.

[0010] In addition, the invention provides a battery pack and an automobile including the same, which is equipped with a structure capable of preventing tap disconnection caused by swelling of the battery cell.

[0011] In addition, the invention provides a battery pack and an automobile including the same, which are equipped with a structure capable of further securing the margin of the electrode leads.

[0012] 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.

[0013] To solve the above objective, the present invention comprises 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 comprises a busbar frame having a predetermined length along the arrangement direction of the plurality of battery cells and at least one busbar mounted on the busbar frame so as to be movable in the longitudinal direction of each busbar frame, connected to the electrode leads of the plurality of battery cells.

[0014] For example, the busbar frame may be composed of a pair of guide frames arranged parallel to each other with a predetermined distance.

[0015] For example, the at least one busbar may be configured to slide along the longitudinal direction of the busbar frame between the pair of guide frames.

[0016] For example, the electrode lead may have a width smaller than the width of the busbar and may be welded to the busbar so as not to contact the busbar frame.

[0017] For example, among the plurality of electrode leads connected together to the busbar, the length of the electrode leads positioned at the outermost edge may be longer than the length of the electrode leads positioned in between.

[0018] For example, the electrode lead can be bent at least once.

[0019] For example, at least some of the plurality of electrode leads connected together to the busbar may have their bending portions partially straightened by the movement of the busbar due to cell swelling of the battery cell.

[0020] For example, the bending portion of the electrode lead may be located in the space between the cell case of the battery cell and the busbar.

[0021] For example, a plurality of electrode leads connected together to the busbar can be bent toward the center of the plurality of electrode leads.

[0022] For example, the above busbars may be provided in multiple numbers and spaced apart from each other by a predetermined distance along the length direction of the busbar frame.

[0023] For example, the busbar assembly may include at least one section configured to be spaced apart from each busbar between mutually adjacent busbars.

[0024] For example, the busbar frame may include a first end portion and a second end portion provided at both ends in the longitudinal direction of the busbar frame, and a groove portion that is recessed to a predetermined depth from one side of the busbar frame along the longitudinal direction of the busbar frame and extends from the first end portion to the second end portion.

[0025] For example, the above-mentioned section may be provided with a connecting part that is inserted into the groove so as to be slidable along the longitudinal direction of the busbar frame.

[0026] For example, at least one fixing part having a through hole of a predetermined size may be formed in the busbar frame.

[0027] For example, the above section can be fixed to the busbar frame through the above fixing part.

[0028] For example, at least one recess may be formed in the busbar frame, recessed to a predetermined depth from one side of the busbar frame.

[0029] For example, the above-mentioned compartment may be configured to be inserted into the above-mentioned recess and fixed in position.

[0030] For example, the busbar frame may include a first end portion and a second end portion provided at both ends in the longitudinal direction of the busbar frame, and a groove portion that is recessed to a predetermined depth from one side of the busbar frame along the longitudinal direction of the busbar frame and extends from the first end portion to the second end portion.

[0031] For example, the busbar may be provided with a connecting portion that is inserted into the groove so as to be slidable along the longitudinal direction of the busbar frame.

[0032] For example, in the busbar assembly, at least one of the connecting portion of the busbar and the groove portion of the busbar frame may be configured as a curved surface.

[0033] For example, the busbar assembly may include a finishing portion configured to make surface contact with at least one of the first end portion and the second end portion.

[0034] For example, the above-mentioned finishing member may include at least one protrusion protruding from one surface of the finishing member and an elastic member connected to the end of the protrusion and having a cross-sectional area larger than the cross-sectional area of ​​the protrusion.

[0035] For example, the above protrusion and the above elastic part may be fitted into an insert formed in either the first end part or the second end part.

[0036] For example, the busbar may be arranged along the longitudinal direction of the busbar frame and may have a concave shape in at least a portion of the side portion of the busbar that is not connected to the busbar frame.

[0037] For example, the electrode lead can be bent along the concave shape.

[0038] For example, the cell assembly may include at least one buffer provided between the plurality of battery cells.

[0039] For example, the battery pack may include a pack case that accommodates a plurality of battery cells, and the pack case may include a base plate that supports the cell assembly and a pair of side plates that each support both sides of the cell assembly.

[0040] For example, the busbar frame may be placed on the pair of side plates and secured with at least one bracket.

[0041] For example, the battery pack may further include a frame support plate configured to be positioned between the pair of busbar frames and to support the busbar assembly from the side.

[0042] For example, the battery pack may include a protective pad provided between the cell assembly and the busbar assembly.

[0043] In addition, the present invention provides a vehicle comprising at least one of the battery packs described above.

[0044] A battery pack according to various embodiments of the present invention and an automobile including the same have the effect of preventing disconnection of the welded portions of the electrode tab and the electrode lead.

[0045] In addition, the battery pack according to various embodiments and the vehicle including the same have the effect that the tension applied to the electrode leads of the battery cells is small even due to cell swelling of the battery cells.

[0046] In addition, the battery pack according to various embodiments and the vehicle including the same have the effect of effectively securing the margin of the electrode leads.

[0047] However, the effects obtainable through the present invention are not limited to those described above, and other unmentioned technical effects will be clearly understood by those skilled in the art from the description of the invention below.

[0048] FIG. 1 is a schematic plan view of a battery pack according to one embodiment of the present invention.

[0049] Figure 2 is a drawing for explaining the movement of a busbar of a busbar assembly of a battery pack according to Figure 1.

[0050] FIG. 3 is a schematic cross-sectional view of a battery pack cut along the AA' line of FIG. 1.

[0051] FIG. 4 is a schematic cross-sectional view of a battery pack cut along the BB' line of FIG. 1.

[0052] FIG. 5 is a diagram illustrating the swollen state of multiple battery cells of a battery pack according to FIG. 4.

[0053] FIG. 6 is an exploded perspective view schematically showing a busbar assembly of a battery pack according to FIG. 1.

[0054] Figure 7 is a drawing for explaining the assembly structure of a busbar assembly according to Figure 6.

[0055] FIG. 8 is a schematic cross-sectional view of a busbar assembly cut along the CC' line of FIG. 7.

[0056] FIG. 9 is an exploded perspective view schematically showing another embodiment of the busbar assembly according to FIG. 7.

[0057] FIG. 10 is a drawing for explaining the assembly structure of a busbar assembly according to FIG. 9.

[0058] FIG. 11 is a schematic cross-sectional view of a busbar assembly cut along the EE' line of FIG. 10.

[0059] FIG. 12 is a schematic cross-sectional view of a busbar assembly cut along the line DD' of FIG. 7.

[0060] FIG. 13 is a schematic cross-sectional view showing another embodiment of the busbar assembly according to FIG. 12.

[0061] FIG. 14 is a drawing for explaining the assembly structure of the finishing portion of the busbar assembly according to FIG. 6.

[0062] FIG. 15 is a cross-sectional view schematically showing the end portion of a busbar assembly cut along the FF' line of FIG. 14.

[0063] FIG. 16 is a schematic cross-sectional view showing another exemplary view of a battery pack cut along the BB' line of FIG. 1.

[0064] FIG. 17 is a schematic diagram showing a busbar according to FIG. 16.

[0065] FIG. 18 is a schematic diagram showing a battery pack according to another embodiment of the present invention.

[0066] FIG. 19 is a schematic drawing showing a bracket fixed to the pack case of a battery pack according to FIG. 18.

[0067] FIG. 20 is a schematic diagram showing a battery pack according to another embodiment of the present invention.

[0068] FIG. 21 is a schematic diagram showing a battery pack according to another embodiment of the present invention.

[0069] FIG. 22 is a drawing for explaining the protective pad of a battery pack according to FIG. 21.

[0070] FIG. 23 is a schematic diagram showing a vehicle including battery packs of the embodiments described above.

[0071] 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, but 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.

[0072] 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.

[0073] In addition, the present invention includes various embodiments. For each embodiment, redundant descriptions of substantially identical or similar configurations are omitted, and the focus is on the differences.

[0074] Additionally, to aid in understanding the invention, the attached drawings are not drawn to actual scale, and the dimensions of some components may be exaggerated. Furthermore, the same reference numerals may be assigned to identical components in different embodiments.

[0075] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless specifically stated otherwise, the first component may also be the second component.

[0076] Throughout the specification, unless specifically stated otherwise, each component may be singular or plural.

[0077] In the following, the statement that any configuration is placed on the "upper (or lower)" of a component or on the "upper (or lower)" of a component may mean not only that any configuration is placed in contact with the upper (or lower) surface of said component, but also that another configuration may be interposed between said component and any configuration placed on (or below) said component.

[0078] In addition, where it is stated that one component is "connected," "combined," or "connected" to another component, it should be understood that while the components may be directly connected or connected to each other, another component may be "interposed" between each component, or each component may be "connected," "combined," or "connected" through another component.

[0079] Singular expressions used in this specification include plural expressions unless the context clearly indicates otherwise. In this application, terms such as "composed of" or "comprising" should not be interpreted as necessarily including all of the various components or steps described in the specification, and should be interpreted as meaning that some of the components or steps may be omitted or additional components or steps may be included.

[0080] 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 position or arrangement, rotation, or position of the observer, as is obvious to those skilled in the art of this invention.

[0081] The present invention may be implemented in the following embodiments, each independently. Furthermore, the present invention may be implemented in combination of two or more of the following embodiments. Each of the following embodiments may not only be implemented independently but may also be freely combined with one another.

[0082] As an example, in the drawings of the present invention, the X-axis direction represents the stacking direction of the battery cells, and the Z-axis direction represents the direction perpendicular to the ground.

[0083]

[0084] First, with reference to FIGS. 1 and FIGS. 2, the overall structure of a battery pack (10) according to one embodiment of the present invention will be described.

[0085] FIG. 1 is a schematic plan view of a battery pack (10) according to one embodiment of the present invention, and FIG. 2 is a drawing for explaining the movement of a busbar (220) of a busbar assembly (200) of a battery pack (10) according to FIG. 1.

[0086] Referring to FIGS. 1 and 2, a battery pack (10) according to one embodiment of the present invention includes a cell assembly (100) comprising a plurality of battery cells (110) arranged in at least one row, and a busbar assembly (200) electrically connected to the cell assembly (100).

[0087] First, the plurality of battery cells (110) of the cell assembly (100) can be classified into cylindrical battery cells, prismatic battery cells, and pouch-type battery cells. Hereinafter, in the case of the present embodiment, the battery cells (110) are exemplarily described as being provided as pouch-type battery cells, as shown in the drawings. A pouch-type battery cell generally refers to a battery cell (110) in which the cell case (114) housing the electrode assembly (111) is a pouch case.

[0088] The electrode leads (113) of a plurality of battery cells (110) generally protrude / extend to the outside of the cell case (114). Such a pouch-type battery cell includes an electrode lead (113) of a first polarity and an electrode lead (113) of a second polarity, and at least one cell assembly (100) can be formed by stacking a plurality of pouch-type battery cells facing each other in at least one row.

[0089] The busbar assembly (200) may include a busbar frame (210) and at least one busbar (220) mounted on the busbar frame (210) so as to be electrically connected to the cell assembly (100).

[0090] The busbar frame (210) is provided with a predetermined length along the arrangement direction (X) of the plurality of battery cells (110). The predetermined length may be provided to match the size of the pack case (500) of the battery pack (10) to be described later.

[0091] At least one busbar (220) is connected to the electrode leads (113) of a plurality of battery cells (110), and the polarity of the electrode leads connected to the at least one busbar (220) may be the same or different for each connected battery cell (110).

[0092] The above at least one busbar (220) can be connected to the busbar frame (210) so as to be movable independently along the longitudinal direction of the busbar frame (210).

[0093] The independent movement of at least one bus bar (220) can be coupled with the movement of the electrode lead (113) of the battery cells (110) connected to the at least one bus bar (220). When cell swelling occurs in the battery cell (110), a significant amount of tension may be applied to the electrode lead (113) connected to the bus bar (220) according to the expansion of the battery cell (110). In this embodiment, through the movement of the at least one bus bar (220), the tension applied to the electrode lead (113) between the at least one bus bar (220) and the cell case (114) of the battery cell (110) during cell swelling can be minimized.

[0094] In the battery pack (10) according to the present embodiment, when cell swelling occurs, at least one bus bar (220) connected to the electrode lead (113) of the battery cell (110) is configured to move independently from the bus bar frame (210), thereby sufficiently relieving the tension applied to the electrode lead (113) of the plurality of battery cells (110) compared to a battery pack having a bus bar fixed to the bus bar frame by welding or the like.

[0095] Thus, in one embodiment of the present invention, the tension applied to the electrode lead (113) can be reduced by moving the busbar (220) connected to the electrode lead (113) during cell swelling, thereby maintaining the stability of the electrical connection. As a result, the long-term durability of the battery pack (10) and the reliability of the entire battery system can be enhanced.

[0096] The busbar frame (210) according to the present embodiment may be composed of a pair of guide frames (211) arranged in parallel to maintain a predetermined distance from each other. The guide frames (211) have a rod shape, and this structure may be designed so that the busbar (220), described later, can slide smoothly along the longitudinal direction of the busbar frame (210) between the pair of guide frames (211). In particular, the distance between the guide frames (211) is adjusted to match the size of the busbar (220), thereby ensuring that the busbar (220) can move freely within a certain length range while also being stably fixed.

[0097] In other words, the busbar frame (210) can be designed to provide a rail-shaped movement path composed of a pair of guide frames (211) so that at least one busbar (220) can slide along this rail-shaped movement path.

[0098] For example, a pair of electrode leads (113) provided in a plurality of battery cells (110), namely, an electrode lead (113) of the first polarity or an electrode lead (113) of the second polarity, are each arranged in a parallel line along 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 the electrode leads (113) in a line among the arrangement of the pair of electrode leads (113) provided in parallel. The four busbars (220) can each be mounted on the busbar frame (210) so as to be slidably on both sides along the longitudinal direction of the busbar assembly (200) between a pair of guide frames (211).

[0099] Accordingly, the battery pack (10) according to the present embodiment can provide a structure that can stably mount at least one busbar (220) through a busbar frame (210) in the form of a sliding rail.

[0100] In addition, since the busbar (220) moves in a sliding manner between a pair of guide frames (211), the busbar (220) can be mounted to the busbar frame (210) with a simpler structure when mounting the busbar (220) to the busbar frame (210). Furthermore, since each busbar (220) can be arranged in a line relative to the busbar frame (210), the space utilization within the battery pack (10) is maximized.

[0101]

[0102] Next, a specific connection structure of the cell assembly (100) and the busbar assembly (200) of the battery pack (10) according to one embodiment of the present invention will be described.

[0103] FIG. 3 is a schematic cross-sectional view of a battery pack (10) cut along the AA' line of FIG. 1, FIG. 4 is a schematic cross-sectional view of a battery pack (10) cut along the BB' line of FIG. 1, and FIG. 5 is a drawing for explaining the swollen state of a plurality of battery cells (110) of the battery pack (10) according to FIG. 4.

[0104] Referring to FIGS. 3 and 4, the battery cell (110) may include an electrode assembly (111), an electrode tab (112), a pair of electrode leads (113) and a cell case (114).

[0105] The electrode assembly (111) is formed by alternately stacking positive electrode plates and negative electrode plates, with the plates separated by a separator. Each of these electrode plates may be connected to an electrode tab (112) protruding from the electrode assembly (111) according to its respective polarity. The electrode tab (112) may include a positive electrode tab (1121) and a negative electrode tab (1122).

[0106] A plurality of electrode tabs (112) protruding from such an electrode assembly (111) can be pulled at an angle, gathered, and then compressed to weld to an electrode lead (113). That is, the welded area between the electrode lead (113) and the plurality of electrode tabs (112) is vulnerable to stress when swelling of the battery cell occurs, and thus becomes a part where a disconnection is highly likely to occur.

[0107] A pair of electrode leads (113) can each be connected to a positive tab (1121) and a negative tab (1122) connected to an electrode assembly (111). The electrode lead (113) connected to the positive tab (1121) functions as a positive lead (1131) having a first polarity, and the electrode lead (113) connected to the negative tab (1122) functions as a negative lead (1132) having a first polarity. At least a portion of the electrode leads (113) may protrude outside the cell case (114).

[0108] As previously described, the cell case (114) may be a pouch-type case. Here, the pouch case may typically be composed of a laminate sheet structure consisting of an inner layer, a metal layer, and an outer layer. Here, since the inner layer is in direct contact with the electrode assembly (111), it may have insulating properties and resistance to electrolytes. Additionally, for sealing with respect to the outside, the sealing properties, that is, the sealing portion formed by the heat bonding of the inner layers, may have excellent heat bonding strength.

[0109] The electrode lead (113) protruding out of the cell case (114) of each battery cell (110) shown in FIG. 3 can be connected to the aforementioned bus bar (220).

[0110] The busbar (220) is made of a metal material, such as copper, silver, tin, or plated copper, which has electrical conductivity, so that current can be safely passed through it. The electrode leads (113) can be in close contact with and welded to the busbar (220) to allow current to flow through them. In addition, the busbar frame (210), which provides a path for the busbar (220) to move, can be made of an insulating material to provide electrical insulation.

[0111] A pair of electrode leads (113) provided in a plurality of battery cells (110) are arranged in a parallel line along the stacking direction (X) of the plurality of battery cells (110).

[0112] At this time, the cell assembly (100) may form a group for each of the plurality of battery cells (110). Electrode leads (113) arranged within the same group along one of the arrangements may be attached to the same busbar (220) by means such as welding. Additionally, at least some of the electrode leads (113) arranged within the group along another arrangement and at least some of the electrode leads (113) arranged within another group may be attached to the same busbar (220) by means such as welding. Thus, the cell assembly (100) can be designed to be energized as a whole.

[0113] The electrode leads (113) connected to the same busbar (220) within the same group may consist of some positive leads (1131) and the rest negative leads (1132).

[0114] As an example, the battery pack (10) may include a cell assembly (100) in which a plurality of battery cells (110) are arranged in a row, with both a positive lead (1131) and a negative lead (1132) disposed on one side of each cell case (114). In this case, the positive lead (1131) or the negative lead (1132) are arranged in a row parallel to each other along the stacking direction (X) of the plurality of battery cells (110). Four of these plurality of battery cells (110) may form a group, and among the four electrode leads (113) connected to the same busbar (220) within the same group along the same arrangement, two electrode leads (113) may be positive leads (1131) and two electrode leads (113) may be negative leads (1132). That is, this structure is a structure in which the positive leads (1131) and negative leads (1132) of four battery cells (110) are connected in parallel in pairs, and the positive leads (1131) of two battery cells (110) and the negative leads (1132) of two other battery cells are overlapped and welded to both sides of a bus bar (220) to conduct electricity.

[0115] Of course, the number of battery cells (110) to be included in a group can be determined by considering the number of battery cells (110), the capacity of the battery cells (110), etc. Additionally, the number and polarity of the electrode leads (113) coupled to a single busbar (220) may differ from the example given here depending on the series and parallel connection relationship of the plurality of battery cells (110).

[0116] Each electrode lead (113) may have a width (a1) smaller than the width (a2) of the connected busbar (220). This allows the electrode lead (113) to be stably welded to the busbar (220) while avoiding physical contact with the busbar frame (210). Thus, free movement of the busbar (220) within the busbar frame (210) is ensured, thereby maintaining an electrical connection between the electrode lead (113) and the busbar (220) while providing structural flexibility.

[0117] Additionally, the length of the electrode lead (113) protruding out of the cell case (114) can be formed to be longer than the distance between the cell case (114) of the battery cell (110) and the busbar frame (210). This allows the tension applied to the electrode lead (113) in the space between the busbar frame (210) and the cell case (114) to be minimized during cell swelling.

[0118] Additionally, among the multiple electrode leads (113) connected together to the same busbar (220), the outermost electrode lead (113) may be designed to have a longer length than the other electrode leads (113) located in between. This is because when cell swelling occurs, the outermost electrode lead (113) may undergo the greatest positional change as the busbar (220) moves, and thus is likely to receive the greatest mechanical stress and deformation.

[0119] Additionally, the electrode leads (113) of the plurality of battery cells (110) may be provided such that their length gradually increases from the center (C) of the plurality of battery cells (110) having electrode leads (113) connected to the same busbar (220) toward the outermost side.

[0120] The electrode lead (113) can be bent at least once outside the cell case (114) of the battery cell (110) so that it can be positioned without interference problems such as entanglement or twisting between adjacent leads (113) while ensuring sufficient length within the space between the cell case (114) and the busbar frame (210). By doing so, the bent portion of the electrode lead (113) can be at least partially straightened out as the battery cell (110) expands due to cell swelling, thereby effectively minimizing the cell swelling force applied to the electrode lead (113). By doing so, the risk of the electrode lead (113) detaching from the busbar (220) or the connection portion between the electrode lead (113) and the electrode tab (112) being short-circuited during cell swelling can be effectively prevented.

[0121] The bending portion of the electrode lead (113) can be placed in the space between the cell case (114) of the battery cell (110) and the busbar frame (210). This can help prevent the longitudinal movement of the busbar (220) within the busbar frame (210) from being obstructed in the event of expansion of the battery cell (110) due to cell swelling.

[0122] Additionally, among the plurality of electrode leads (113) connected to the same busbar (220), the electrode lead (113) positioned at the outermost edge can be bent more than the remaining electrode leads (113), and the number of bending cycles can increase as one moves from the center (C) of the plurality of battery cells (110) equipped with electrode leads (113) connected to the same busbar (220) toward the outermost edge. By doing so, the margin distance of the electrode lead (113), where positional misalignment due to pressure deformation during cell swelling can occur most severely, can be increased, thereby effectively improving the durability of the overall battery pack (10).

[0123] Additionally, the electrode lead (113) connected to the same busbar (220) may be designed to be bent so that a portion of it protrudes toward the center (C). This configuration can prevent interference or collision between the electrode leads (113) connected to each busbar (220) that may occur due to the independent movement of each busbar (220) when a plurality of busbars (220) are mounted on the busbar frame (210). That is, by bending the electrode lead (113) toward the center (C), the bent portions of the electrode leads (113) can be designed so that they do not collide with each other when movement of each busbar (220) occurs within the busbar frame (210).

[0124] Additionally, the electrode lead (113) connected to the same busbar (220) may be arranged to have a symmetrical shape with respect to the center (C). This reduces the stress applied to a specific area, thereby reducing the risk of breakage or disconnection that may occur at the joint between the electrode tab (112), the electrode lead (113), and the busbar (220).

[0125] Referring to FIG. 5, at least some of the multiple electrode leads (113) connected together to the same busbar (220) move in the direction of expansion, where the width of the cell assembly (100) increases due to the expansion of the battery cell (110) caused by cell swelling. At this time, the tension generated as the bending portion of the electrode lead (113) partially straightens is also transmitted to the busbar (220) connected to the electrode lead (113), causing the busbar (220) to move together in the direction of expansion along the length of the busbar frame (210).

[0126] Thus, when gas is generated inside a battery cell (110) within the cell assembly (100) due to causes such as overcharging, overheating, or external impact, and a swelling phenomenon occurs in which the battery cell (110) expands, the mechanical stress applied to the electrode lead (113) can be effectively relieved.

[0127] Accordingly, the battery pack (10) according to the present embodiment prevents damage to the electrical connection between the busbar (220) and the electrode lead (113) during cell swelling, and disperses the stress applied to the electrode lead (113) to prevent damage and disconnection of the welded portion or electrical joint between the electrode tab (112) and the electrode lead (113).

[0128]

[0129] Hereinafter, we will examine in detail the specific assembly structure of the busbar assembly (200) according to various embodiments of the present invention.

[0130] FIG. 6 is an exploded perspective view schematically showing a busbar assembly (200) of a battery pack (10) according to FIG. 1, FIG. 7 is a drawing for explaining the assembly structure of the busbar assembly (200) according to FIG. 6, and FIG. 8 is a cross-sectional view schematically showing a busbar assembly (200) cut along the CC' line of FIG. 7.

[0131] Referring to FIGS. 6 to 8, a busbar assembly (200) of a battery pack (10) according to one embodiment of the present invention may include at least one partition (230).

[0132] The busbars (220) are provided in multiple numbers and can be spaced apart from each other at a predetermined interval along the length direction of the busbar frame (210). At this time, at least one section (230) is formed between each busbar (220) and can be arranged while maintaining a certain distance from adjacent busbars (220).

[0133] Thus, the partition (230) serves to limit the range of movement of each busbar (220) within the busbar frame (210). As a result, the movement space is partitioned according to the number of busbars (220), thereby ensuring independent movement of each busbar (220) without affecting one another.

[0134] Accordingly, the battery pack (10) according to the present embodiment can effectively suppress physical damage or disconnection that may occur at the welded portion or electrical joint between the electrode tab (112) and the electrode lead (113) by preventing the bus bar (220) from moving excessively. Through this, the stability of the electrical connection of the battery pack (10) is maintained, and at the same time, the long-term reliability and durability of the battery system can be improved.

[0135] These sections (230) can be directly mounted on the busbar frame (210).

[0136] Specifically, the busbar frame (210) includes a first end portion (2113) and a second end portion (2114) provided at both ends in the longitudinal direction of the busbar frame (210), and may include a groove portion (2111) formed on one surface of the busbar frame (210).

[0137] The groove (2111) of the busbar frame (210) can be formed continuously from the first end portion (2113) to the second end portion (2114) by being recessed to a predetermined depth from one side of the busbar frame (210) along the longitudinal direction of the busbar frame (210).

[0138] The section (230) may be provided with a connecting part (231) configured to be inserted into the groove (2111) of the busbar frame (210) and slide along the longitudinal direction of the busbar frame (210).

[0139] Thus, the section (230) provides a structural advantage that it can be mounted on the busbar frame (210) without a separate connecting member or additional fixing means. In addition, since the section (230) is designed to move in a sliding manner on the busbar frame (210), simple and efficient movement and placement are possible without a complex movement mechanism.

[0140] As described above, the busbar frame (210) may be composed of a pair of guide frames (211), and the connecting portion (231) of the partition portion (230) is configured to protrude a predetermined length from one side of the partition portion (230) and the other side provided on the opposite side, so that it can be inserted as if fitted from both sides.

[0141] Specifically, the structure of the section (230) can be designed to minimize structural interference with the busbar frame (210). The length of the section (230) is designed to maintain an appropriate ratio with the longitudinal direction of the busbar frame (210) so that it can be inserted in a sliding manner into the groove (2111) of the busbar frame (210), and the shape of the connecting part (231) of the section (230) can be designed to correspond to the shape of the groove (2111) of the busbar frame (210). In addition, the thickness of the section (230) is set so that the busbar (220) can slide smoothly within the movement space of the busbar frame (210), and so that the movement of the busbar (220) is not restricted due to excessive thickness.

[0142] At this time, the heights of the section (230) and the busbar frame (210) in the Z-axis direction may be the same or different from each other and are not limited to the exemplary shape shown in the drawing.

[0143] The busbar frame (210) may be provided with at least one fixed part (2112) having a through hole of a predetermined size.

[0144] These fixed parts (2112) serve to fix the position of the partition (230) in the busbar frame (210), thereby maximizing structural stability. For example, the connecting part (231) of the partition (230) can be firmly fixed to the groove (2111) within the busbar frame (210) by welding (W) or bolting through the fixed part (2112). This allows for accurate position control of the partition (230) in the busbar frame (210) even in the event of movement of the busbar (220) due to swelling of the battery cell (110) or external impact.

[0145] In this specification and drawings, a structure in which the connecting portion (231) of the partition portion (230) is inserted into the groove portion (2111) of the busbar frame (210) has been described as an example, but the present invention is not limited thereto. For example, an alternative structure in which a protrusion is formed on the busbar frame (210) itself and this protrusion is inserted into the groove formed in the partition portion (230) is also possible. Such modified structures can be implemented in various ways depending on the design purpose, and the coupling form between the partition portion (230) and the busbar frame (210) can be freely changed according to technical requirements and the efficiency of the manufacturing process.

[0146]

[0147] FIG. 9 is an exploded perspective view schematically showing a busbar assembly (201) according to another embodiment of FIG. 6, FIG. 10 is a drawing for explaining the assembly structure of the busbar assembly (201) according to FIG. 9, and FIG. 11 is a cross-sectional view schematically showing a busbar assembly (201) cut along the line EE' of FIG. 10.

[0148] Referring to FIGS. 9 to 11, a busbar assembly (201) of a battery pack (10) according to one embodiment of the present invention may include at least one partition (230a). Here, regarding the common details between the partition (230a) and the partition (230) described above with reference to FIGS. 6 to 8, the same details may be applied to the partition (230a), and redundant descriptions below will be omitted.

[0149] These sections (230a) are configured as simple rod-shaped and can be directly mounted to the busbar frame (210), thereby enabling simple and efficient assembly.

[0150] At least one recess (2115) may be formed in the busbar frame (210) to a predetermined depth from one side, and the partition (230a) may be inserted into the recess (2115) to fix its position.

[0151] The partition (230a) can be directly inserted from the outside into the recess (2115) of the busbar frame (210), thereby improving installation flexibility and work efficiency. For example, the partition (230a) can be inserted from the top to the bottom into the recess (2115) formed to a predetermined depth on the upper surface of the busbar frame (210), allowing for immediate installation without complex assembly procedures or interference between parts. Thus, the partition (230a) is structured so that it does not require positional adjustment with other components inside the frame, and can be easily inserted from the outside by a worker, thereby simplifying the assembly process and contributing to labor cost reduction.

[0152] In addition, the direct external insertion structure can reinforce the connection in various ways, such as welding (W) or bolt fastening, thereby maintaining a solid fixed state even after mounting while providing the effect of increasing work convenience.

[0153]

[0154] FIG. 12 is a schematic cross-sectional view of a busbar assembly (200) cut along the DD' line of FIG. 7, and FIG. 13 is a schematic cross-sectional view of another embodiment of the busbar assembly (200) according to FIG. 12.

[0155] Referring to FIGS. 12 and FIGS. 13 in addition to FIGS. 6 and FIGS. 7 examined earlier, the busbar frame (210) may include a groove (2111) as described above.

[0156] The busbar (220) may be provided with a connecting part (221) configured to be inserted into a groove (2111) of the busbar frame (210) and slide along the longitudinal direction of the busbar frame (210).

[0157] Thus, the busbar (220) provides a structural advantage of being able to be mounted on the busbar frame (210) without a separate connecting member or additional fixing means. In addition, since the busbar (220) is designed to move in a sliding manner on the busbar frame (210), simple and efficient movement and placement are possible without a complex movement mechanism.

[0158] As described above, the busbar frame (210) may be composed of a pair of guide frames (211), and the connecting portion (221) of the busbar (220) is configured to protrude a predetermined length from one side of the busbar (220) and the other side provided on the opposite side, so that it can be inserted as if fitted from both sides.

[0159] Specifically, the structure of the busbar (220) can be designed to minimize structural interference with the busbar frame (210). The length of the busbar (220) is designed to maintain an appropriate ratio with the longitudinal direction of the busbar frame (210) so that it can be inserted in a sliding manner into the groove (2111) of the busbar frame (210), and 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).

[0160] At this time, the heights of the busbar (220) and the busbar frame (210) in the Z-axis direction may be the same or different from each other and are not limited to the exemplary shapes shown in the drawing.

[0161] The shape of the connecting portion (221) of the busbar (220) and the groove portion (2111) of the busbar frame (210) can be varied in design and is not limited to the exemplary shape presented in the present invention. Specifically, the connecting portion (221) of the busbar (220) can take on various geometric shapes, and the groove portion (2111) of the busbar frame (210) can also be modified to various depths, widths, and shapes to maintain mutual coupling with the connecting portion (221) of the busbar (220). For example, as shown in FIG. 12, the shape of the connecting portion (221) of the busbar (220) and the groove portion (2111) of the busbar frame (210) can be designed as a rectangle. Additionally, as shown in FIG. 13, the shape of the connecting portion (221) of the busbar (220) and the groove portion (2111) of the busbar frame (210) can be designed as a curve. This may change depending on the structural requirements of the battery pack (10) or the optimization of the manufacturing process.

[0162] As an example, at least one of the connecting portion (221) of the busbar (220) and the groove portion (2111) of the busbar frame (210) may be formed as a curved surface. Such a curved surface design can make the insertion and removal of the joint part easier, thereby simplifying the assembly process and increasing the convenience of the worker. In addition, since the curved surface induces natural positional alignment upon insertion, positional errors of the part can be reduced even during manual assembly.

[0163] Such design freedom can be implemented in an optimized form according to system requirements, and various modifications are possible by considering structural stability, electrical performance, manufacturing efficiency, etc.

[0164] Likewise, in this specification and drawings, a structure in which the connecting portion (231) of the partition portion (230) is inserted into the groove portion (2111) of the busbar frame (210) has been described as an example, but the present invention is not limited thereto.

[0165]

[0166] FIG. 14 is a drawing for explaining the assembly structure of the end portion (240) of the busbar assembly (200) according to FIG. 6, and FIG. 15 is a cross-sectional view schematically showing the end portion (240) of the busbar assembly (200) cut along the FF' line of FIG. 14.

[0167] Referring to the description of FIG. 7 and FIG. 14 and FIG. 15 above, the busbar assembly (200) according to the present embodiment may include a finishing portion (240).

[0168] The end portion (240) may be configured to make surface contact with at least one of the first end portion (2113) and the second end portion (2114) of the busbar frame (210).

[0169] The end portion (240) is designed to be joined to at least one end portion of the busbar frame (210), thereby contributing to maintaining a constant movement space for at least one busbar (220) provided by the busbar frame (210). By doing so, the overall structural deformation of the busbar frame (210) can be minimized even if external shock or vibration occurs due to fixation at at least one of the first end portion (2113) and the second end portion (2114) of the busbar frame (210).

[0170] In particular, as described above, the busbar frame (210) may be composed of a pair of guide frames (211) arranged in parallel to each other at a predetermined distance. At this time, the structural stability of the busbar frame (210) can be further enhanced by fixing it so that the predetermined distance is maintained at a constant level by the end portion (240).

[0171] The end portion (240) may be configured in a rod shape or a 'U' shape, and such a design can increase structural stability and maximize functional efficiency. The end portion (240) may include at least one protrusion (241) protruding from one side and an elastic portion (242) connected to the end of the protrusion (241).

[0172] The protrusion (241) of the end portion (240) is configured to be fitted into an insert (2116) formed on at least one of the first end portion (2113) and the second end portion (2114) of the busbar frame (210), thereby ensuring a stable and secure connection. For example, two protrusions (241) of the end portion (240) are formed on each side of one surface, and two inserts (2116) are provided on at least one of the first end portion (2113) and the second end portion (2114) of the busbar frame (210) so that they can be fitted into each other. This configuration strengthens the connection between the end portions (2113, 2114) of the busbar frame (210) and the end portion (240), thereby maintaining stability despite external forces or vibrations.

[0173] The elastic portion (242) of the finishing portion (240) may have a cross-sectional area larger than the cross-sectional area of ​​the protrusion (241) of the finishing portion (240).

[0174] That is, the elastic part (242) of the end portion (240) is composed of an elastic member and can be deformed by an external force, so it can be stably fitted and coupled to the insert portion (2116) without a separate fixing member. For example, the elastic part (242) of the end portion (240) may have a width (c2) greater than the width (c1) of the protrusion (241) of the end portion (240). In addition, the width (d1) of the first end portion (2116a) of the insert portion (2116) may be equal to the width (c1) of the protrusion (241) of the end portion (240), and the width (d2) of the second end portion (2116b) of the insert portion (2116) may be configured to be equal to the width (c2) of the elastic part (242) of the end portion (240). Thus, since the overall shape of the protruding and concave parts corresponds, the busbar frame (210) and the finishing part (240) can be firmly fixed while reducing parts such as separate fastening members, thereby reducing the overall weight.

[0175]

[0176] FIG. 16 is a schematic cross-sectional view showing another exemplary view of a battery pack (10) cut along the BB' line of FIG. 1, and FIG. 17 is a schematic perspective view showing a bus bar (220a) according to FIG. 16.

[0177] Referring to FIGS. 16 and 17, the busbar (220a) is a portion arranged along the longitudinal direction of the busbar frame (210), particularly the guide frame (211), and may be provided with a curved portion (222) having a concave shape on at least a part of the side not connected to the busbar frame (210, 211). Here, regarding the common details between the busbar (220) and the busbar (220a) described in FIGS. 1 to 13, the same details can be applied to the busbar (220a), and redundant descriptions below will be omitted.

[0178] The busbar (220a) may be provided with a connecting portion (221a) configured to be inserted into a groove (2111) of the busbar frame (210) and slide along the longitudinal direction of the busbar frame (210). This provides a structural advantage that allows it to be mounted on the busbar frame (210) without a separate connecting member or additional fixing means. In addition, since the connecting portion (221a) is designed to move in a sliding manner on the busbar frame (210), simple and efficient movement and placement are possible without a complex movement mechanism.

[0179] A curved portion (222) may be formed on the side between the connecting portions (221) of the busbar (220a). The electrode lead (113) may be configured to naturally bend along the concave shape formed on the curved portion (222) of the busbar (220a). This concave shape can be precisely formed using a busbar pressurizing device or molding equipment during the manufacturing process. That is, by gently bending the electrode lead (113) inwardly along the concave shape of the curved portion (222) of the busbar (220a), the electrical connection between the electrode lead (113) and the busbar (220a) is smoothly established, and a margin can be secured to accommodate swelling of the battery cell (110) or deformation caused by external impact.

[0180] Thus, even if the bent portion of the electrode lead (113) is not necessarily formed between the cell case (114) and the busbar frame (210), the electrode lead (113) can secure an additional electrode lead margin without obstructing the movement path of the busbar (220a) within the busbar frame (210).

[0181] Accordingly, the battery pack (10) according to the present embodiment can effectively utilize space in relation to the electrode lead (113) with the busbar assembly (200), while also flexibly responding to deformation caused by cell swelling or external impact.

[0182]

[0183] Referring to FIGS. 1 and 2 above, the cell assembly (100) may be a bidirectional withdrawal type battery cell in which a first polarity electrode lead (113) and a second polarity electrode lead (113) are drawn out in opposite directions. The first polarity electrode lead may be a positive lead (1131), and the second polarity electrode lead may be a negative lead (1132). Of course, the opposite may also be true.

[0184] Additionally, the cell assembly (100) may be a unidirectional drawing-type battery cell in which a first polarity electrode lead (113) and a second polarity electrode lead (113) provided for each battery cell (110) are drawn out in the same direction. Likewise, 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 positioned upright so that the side of each battery cell (110) is placed on the ground so that a pair of electrode leads (113) can be arranged to extend along a direction (Z) perpendicular to the ground.

[0185] As an example, the cell assembly (100) may further include at least one buffer (120) between a plurality of battery cells (110) arranged in a row.

[0186] The buffer section (120) may be interposed between adjacent battery cells (110) and may be placed between groups of multiple battery cells (110) connected to the same busbar (220) to minimize the increase in thickness of the cell assembly (100).

[0187] Additionally, the buffer (120) may be made of an elastic material to absorb swelling when cell swelling occurs and the battery cell (110) expands convexly along the stacking direction (X) of the battery cell (110). For example, it may include at least one of expanded polypropylene (EPP) and urethane. Thus, the buffer (120) can stably absorb volume expansion due to swelling of the battery cell (110).

[0188] The busbar frame (210) may be provided by being positioned on at least one side of the cell assembly (100). For example, when a pair of electrode leads (113) are drawn out in opposite directions, the busbar frame (210) may be positioned on both sides of the cell assembly (100), that is, on the sides of the cell assembly (100).

[0189] Additionally, when a pair of electrode leads (113) are drawn out in the same direction, the busbar frame (210) can be positioned on one side of the cell assembly (100), that is, on the top of the cell assembly (100).

[0190] In addition, the battery pack (10) of the present invention may include a pack case (500).

[0191] The pack case (500) can accommodate a cell assembly (100) comprising a plurality of battery cells (110) arranged in at least one row in an inner receiving space, by removing the intermediate module stage. That is, the cell assembly (100) can be located inside the pack case (500).

[0192] Accordingly, the present invention can implement a battery pack (10) with a so-called CTP (Cell to Pack) structure.

[0193]

[0194]

[0195] Hereinafter, with reference to FIGS. 18 to 22, the structure of a battery pack (20, 30, 40) according to various embodiments of the present invention will be examined.

[0196] Here, regarding the common details between the battery pack (10) of the embodiment described above with reference to FIGS. 1 to 17 and the battery packs (20, 30, 40) of the embodiments to be described later, the same details can be applied to the battery packs (20, 30, 40), and redundant descriptions below are omitted.

[0197] A battery pack (10, 20, 30, 40) according to one embodiment of the present invention may further include various other components of a battery pack known at the time of filing the present invention. For example, a battery pack (10, 20, 30, 40) according to one embodiment of the present invention may further include components such as a current sensor, a fuse, and a service plug. Furthermore, the battery pack (10, 20, 30, 40) may be provided with a terminal connection portion (250) extending upward from two of the plurality of bus bars (220, 220a). An external input / output terminal (not shown) in the form of a bolt may be formed in the terminal connection portion (250) to stably perform power input and output.

[0198] FIG. 18 is a schematic drawing of a battery pack (20) according to another embodiment of the present invention, and FIG. 19 is a schematic drawing of a bracket (300) fixed to a pack case (500) of the battery pack (20) according to FIG. 18.

[0199] Referring to the description of FIG. 1 and FIG. 18 and FIG. 19 examined above, the battery pack (10, 20) may include a pack case (500) that forms the exterior of the battery pack (10, 20) and has a receiving space on the inside. This applies similarly to the battery packs (30, 40) of other embodiments to be examined later, and is described here.

[0200] Specifically, the pack case (500) may include a base plate (510), a side plate (520), an end plate (530), and a cover plate (not shown).

[0201] The base plate (510) can form the lower surface of the pack case (500). In other words, the base plate (510) can be located at the bottom. The side plate (520) and the end plate (530) can be positioned along the perimeter of the base plate (510) to cover the left / right and front / rear sides of the cell assembly (100), respectively. The lower sides of the side plate (520) and the end plate (530) can be connected to the base plate (510). Additionally, the cover plate can be configured to cover the upper sides of the side plate (520) and the end plate (530).

[0202] Referring to FIGS. 18 and 19, the battery pack (20) according to the present embodiment can fix a busbar frame (210) to a pack case (500), for example, a side plate (520). Thus, the busbar frame (210) is fixed, and only the busbar (220, 220a) can move independently according to cell swelling.

[0203] As an example, the busbar frame (210) may have both ends in the longitudinal direction of the busbar frame (210) fixed on the side plate (520).

[0204] To reinforce such fixation, at least one bracket (300) may be installed at both ends in the longitudinal direction of the busbar frame (210). Here, the bracket (300) may have a bracket shape with a curved portion formed therein. In addition, the fixing structure of the bracket (300) is exemplified by a bolt connection, but is not limited thereto and may have various fixing structures.

[0205] By doing so, the fixing strength of the side plate (520) and the busbar frame (210) is further strengthened, ensuring the stability of the entire structure and significantly improving resistance to external shocks or vibrations.

[0206] FIG. 20 is a schematic diagram showing a battery pack (30) according to another embodiment of the present invention.

[0207] Referring to FIG. 20, the battery pack (30) according to the present embodiment may include a frame support plate (400) disposed between a pair of busbar frames (210).

[0208] The frame support plate (400) can be formed into a plate-like structure and configured to support the entire structure by fixing each busbar frame (210) from the side. This strengthens the stability of the busbar frame (210) and ensures that electrical connections and mechanical components inside the battery pack (30) remain robust. Additionally, the frame support plate (400) serves as a support for stably placing various electrical components, such as a battery management system (BMS), cooling system, and sensors, thereby maximizing space utilization within the battery pack (30) while providing a high-strength structure. In particular, by fixing the electrical components to the frame support plate (400), damage caused by vibration or external impact is prevented, and accessibility is facilitated during maintenance or component replacement.

[0209] FIG. 21 is a schematic drawing of a battery pack (40) according to another embodiment of the present invention, and FIG. 22 is a drawing for explaining a protective pad (600) of the battery pack (40) according to FIG. 21.

[0210] Referring to FIGS. 21 and 22, the battery pack (40) according to the present embodiment may include a protective pad (600).

[0211] A protective pad (600) is placed between the cell assembly (100) and the busbar assembly (200, 201) to prevent physical collision between the multiple battery cells (110) and the busbar (220, 220a) caused by the movement of the busbar (220, 220a) when the multiple battery cells (110) undergo swelling. This reduces direct contact or friction between the battery cells (110) and the busbar (220, 220a), and prevents electrical connection or structural damage. As a result, the durability and stability of the battery pack (40) can be further improved.

[0212] However, the protective pad (600) can be designed with an appropriate thickness so as not to hinder the movement of the bus bar (220, 220a), and is configured to ensure mobility, especially when placed around the electrode lead (113). Thus, the protective pad (600) prevents physical collisions caused by cell swelling while allowing free movement of the bus bar (220, 220a) and the electrode lead (113), thereby maintaining the electrical connection of the battery pack (40) and enabling stable operation without performance degradation.

[0213]

[0214] FIG. 23 is a schematic diagram showing a vehicle (V) including battery packs (10, 20, 30, 40) of the aforementioned embodiments.

[0215] Referring to FIG. 23, a vehicle (V) according to one embodiment of the present invention may include one or more battery packs (10, 20, 30, 40) 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 packs (10, 20, 30, 40). For example, the vehicle (V) according to one embodiment of the present invention may include, in addition to the battery packs (10, 20, 30, 40) according to one embodiment of the present invention, a vehicle body, a motor, an ECU (electronic control unit), or a control device.

[0216] In addition, the battery pack (10, 20, 30, 40) according to one embodiment of the present invention can be applied to various types of energy storage devices or power sources, and it is also possible to equip it in other devices, mechanisms, and facilities, such as an energy storage system using a secondary battery, in addition to the vehicle (V).

[0217]

[0218] 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.

[0219] [Explanation of Symbols] 10, 20, 30, 40: Battery Pack

[0220] 100: Cell Assembly

[0221] 110: Battery cell

[0222] 111: Electrode assembly

[0223] 112: Electrode tab

[0224] 1121: Positive tab

[0225] 1122: Negative tab

[0226] 113: Electrode Lead

[0227] 1131: Positive lead

[0228] 1132: Cathode Lead

[0229] 114: Cell Case

[0230] 120: Buffer

[0231] 200, 201: Busbar assembly

[0232] 210: Busbar Frame

[0233] 211: Guide Frame

[0234] 2111: Homeboo

[0235] 2112: Fixed part

[0236] 2113: 1st terminal section

[0237] 2114: Second terminal section

[0238] 2115: Indentation

[0239] 2116: Insert

[0240] 2116a: First end

[0241] 2116b: Second end

[0242] 220, 220a: Busbar

[0243] 221, 221a: Connection

[0244] 222: Curved part

[0245] 230, 230a: Compartment

[0246] 231: Connection

[0247] 240: Closing section

[0248] 241: Protrusion

[0249] 242: Elastic part

[0250] 250: Terminal connection

[0251] 300: Bracket

[0252] 400: Frame support plate

[0253] 500: Pack Case

[0254] 510: Base Plate

[0255] 520: Side plate

[0256] 530: End plate

[0257] 600: Protective pad

[0258] V: Car

[0259] W: Welding

Claims

1. A cell assembly comprising a plurality of battery cells arranged in at least one row; and It includes a busbar assembly electrically connected to the cell assembly above, and The above busbar assembly is, A busbar frame having a predetermined length along the arrangement direction of the plurality of battery cells; and A battery pack characterized by including at least one busbar mounted on a busbar frame, which is connected to the electrode leads of the plurality of battery cells and is movable independently in the longitudinal direction of each busbar frame.

2. In Paragraph 1, The above busbar frame is, It is composed of a pair of guide frames arranged in parallel to each other at a predetermined distance, and A battery pack characterized in that at least one busbar is configured to slide along the longitudinal direction of the busbar frame between the pair of guide frames.

3. In Paragraph 1, The above electrode lead is, A battery pack having a width smaller than the width of the busbar and welded to the busbar so as not to contact the busbar frame.

4. In Paragraph 1, A battery pack characterized in that the length of the electrode lead positioned at the outermost among a plurality of electrode leads connected together to the busbar is longer than the length of the electrode lead positioned between them.

5. In Paragraph 1, The above electrode lead is, It is bent at least once, and A battery pack characterized in that at least some of the plurality of electrode leads connected together to the busbar have a bending portion of the electrode lead partially straightened by the movement of the busbar due to swelling of the battery cell.

6. In Paragraph 5, The bending portion of the electrode lead above is, A battery pack characterized by being located in the space between the cell case of the battery cell and the busbar.

7. In Paragraph 5, A battery pack characterized in that a plurality of electrode leads connected together to the busbar are bent toward the center of the plurality of electrode leads.

8. In Paragraph 1, The above busbar is, Multiple units are provided and spaced apart from each other by a predetermined distance along the length direction of the busbar frame, The above busbar assembly is, A battery pack characterized by including at least one section configured to be spaced apart from each busbar between mutually adjacent busbars.

9. In Paragraph 8, The above busbar frame is, A first end portion and a second end portion provided at both ends in the longitudinal direction of the above-mentioned busbar frame; and It includes a groove portion that is recessed to a predetermined depth from one side of the busbar frame along the longitudinal direction of the busbar frame and extends from the first end portion to the second end portion. In the above compartment, A battery pack characterized by having a connecting portion that is inserted into the groove portion so as to be slidable along the longitudinal direction of the busbar frame.

10. In Paragraph 8, In the above busbar frame, At least one fixed part having a through hole of a predetermined size is formed, and The above section is, A battery pack characterized by being fixed to the busbar frame through the above-mentioned fixing part.

11. In Paragraph 8, In the above busbar frame, At least one recess is formed by being recessed to a predetermined depth from one side of the busbar frame, and The above section is, A battery pack characterized by being configured to be inserted into the above-mentioned recess and fixed in position.

12. In Paragraph 1, The above busbar frame is, A first end portion and a second end portion provided at both ends in the longitudinal direction of the above-mentioned busbar frame; and It includes a groove portion that is recessed to a predetermined depth from one side of the busbar frame along the longitudinal direction of the busbar frame and extends from the first end portion to the second end portion. In the above busbar, A battery pack characterized by having a connecting portion that is inserted into the groove portion so as to be slidable along the longitudinal direction of the busbar frame.

13. In Paragraph 12, The above busbar assembly is, A battery pack characterized in that at least one of the connecting portion of the busbar and the groove portion of the busbar frame is formed as a curved surface.

14. In Paragraph 12, The above busbar assembly is, A battery pack characterized by including a finishing portion configured to make surface contact with at least one of the first end portion and the second end portion.

15. In Paragraph 14, The above finishing part is, At least one protrusion protruding from one surface of the above-mentioned finishing portion; and It includes an elastic member connected to the end of the above-mentioned protrusion and composed of an elastic member having a cross-sectional area larger than the cross-sectional area of ​​the above-mentioned protrusion, The above protrusion and the above elastic part are, A battery pack characterized by being fitted into an insert formed in either of the first end portion and the second end portion.

16. In Paragraph 5, The above busbar is, A concave shape is formed in at least a portion of the side portion of the busbar that is not connected to the busbar frame and is arranged along the longitudinal direction of the busbar frame. The above electrode lead is, A battery pack characterized by being bent along the above-mentioned concave shape.

17. In Paragraph 1, The above cell assembly is, A battery pack characterized by including at least one buffer portion provided between the plurality of battery cells.

18. An automobile equipped with at least one battery pack according to any one of claims 1 to 17.

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