Battery pack

Abstract

The present invention relates to a battery pack including a plurality of chargeable and dischargeable battery cells. A battery pack according to one embodiment of the present invention comprises: a plurality of battery cells; a case forming an inner space in which the plurality of battery cells are accommodated; and a reinforcing unit interposed between inner walls of the case to prevent the deformation of the case. The reinforcing unit may comprise: a first reinforcing unit contacting the inner wall on one side of the case; a second reinforcing unit contacting the inner wall on the opposite side of the case; and a third reinforcing unit thicker than the first and second reinforcing units and disposed between and connecting the first and second reinforcing units. In this case, the third reinforcing unit has a rod shape extending in the longitudinal direction of the battery cells, and the third reinforcing unit may include a through-hole formed along the direction in which the third reinforcing unit extends.

Description

battery pack

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2023-0149488, filed November 1, 2023, and Korean Patent Application No. 10-2024-0026582, filed February 23, 2024, the entire contents of which are incorporated herein by reference.

[0003] Technology field

[0004] The present invention relates to a battery pack comprising a plurality of battery cells capable of being charged and discharged.

[0005] Unlike primary batteries, which are non-rechargeable, secondary batteries (rechargeable batteries) are rechargeable and dischargeable. Small secondary batteries are used in portable electronic devices such as cell phones, laptops, and camcorders, while medium- or large-sized secondary batteries are widely used as power sources for motors in hybrid vehicles and other vehicles.

[0006] Secondary batteries can be utilized in the form of battery cells. A battery cell may have a structure in which a cathode, a separator, and a cathode are sequentially stacked within an outer shell, with the inner space of the outer shell filled with an electrolyte. Multiple battery cells can be electrically connected to form a battery module or battery pack.

[0007] A battery pack has a structure in which multiple battery cells are housed within a case. The interior of the case is formed as an empty space to accommodate the multiple battery cells, and the case is formed thin to increase the energy density of the battery pack.

[0008] In this case, the battery pack case was prone to being crushed or damaged by external impact. Furthermore, external impacts applied to the case were transmitted to the battery cells within the case, damaging the battery cells contained within.

[0009] The present invention was conceived in recognition of the above problems, and the purpose of the present invention is to provide a battery pack that can prevent damage to the case or deformation of the case due to external impact, etc.

[0010] A battery pack according to the present invention comprises: a plurality of battery cells; a case forming an internal space in which the plurality of battery cells are accommodated; and a reinforcing member interposed between an inner wall of the case to prevent deformation of the case, wherein the reinforcing member comprises: a first reinforcing member in contact with one inner wall of the case; a second reinforcing member in contact with the other inner wall of the case; and a third reinforcing member formed thicker than the first and second reinforcing members and connecting the first and second reinforcing members between the first and second reinforcing members, wherein the third reinforcing member has a rod shape extending in the longitudinal direction of the battery cells, and the third reinforcing member may include a through hole formed along a direction in which the third reinforcing member extends.

[0011] The above case may be formed with a pair of openings facing the through hole.

[0012] The first reinforcing member may be a plate-shaped member provided between the third reinforcing member and one inner wall in the width direction of the case, and the second reinforcing member may be a plate-shaped member provided between the third reinforcing member and the other inner wall in the width direction of the case.

[0013] The thickness of the third reinforcing portion may be 4 to 5 mm, and the thickness of the first and second reinforcing portions may be 2.5 to 3.5 mm.

[0014] The diameter of the above through hole may be the same as the diameter of the above opening.

[0015] A screw thread may be formed on the inner surface of the above through hole.

[0016] The above case may be made of plastic material.

[0017] The first to third reinforcing parts may be made of a metal material.

[0018] The first to third reinforcing parts may be made of a plastic material.

[0019] The first and second reinforcing members can be fused to the case.

[0020] Meanwhile, a battery pack according to the present invention includes: a plurality of battery cells; a case forming an internal space in which the plurality of battery cells are accommodated; a reinforcing member interposed between an inner wall of the case to prevent deformation of the case; and a cell fixing housing installed in the internal space to fix the plurality of battery cells, wherein the reinforcing member may include: a first reinforcing member in contact with one inner wall of the case; a second reinforcing member in contact with the other inner wall of the case; and a third reinforcing member formed thicker than the first and second reinforcing members and connecting the first and second reinforcing members between the first and second reinforcing members.

[0021] A cell mounting hole into which the battery cell is mounted can be formed in the above cell fixing housing.

[0022] The above-mentioned reinforcing member can be interposed between the inner walls of the case while being inserted into the cell fixing housing.

[0023] Meanwhile, in the battery pack according to the present invention, a plurality of reinforcing parts may be interposed between the inner walls of the case.

[0024] A battery pack according to one embodiment of the present invention includes a plurality of battery cells, a case forming an internal space in which the plurality of battery cells are accommodated, and a reinforcing member interposed between an inner wall of the case to prevent deformation of the case, wherein the reinforcing member includes a first reinforcing member in contact with one inner wall of the case, a second reinforcing member in contact with the other inner wall of the case, and a third reinforcing member formed thicker than the first and second reinforcing members and connecting the first and second reinforcing members between the first and second reinforcing members, thereby having an advantageous effect of preventing deformation and damage of the case due to external impact.

[0025] FIG. 1 is a perspective view of a battery pack according to a first embodiment of the present invention.

[0026] FIG. 2 is a drawing showing the internal configurations of a battery pack according to the first embodiment of the present invention.

[0027] Figure 3 is a cross-sectional view of a battery pack according to the first embodiment of the present invention.

[0028] FIG. 4 is a cross-sectional view showing a battery pack according to the first embodiment of the present invention, with a fixing pin inserted into a reinforcing portion.

[0029] FIG. 5 is a drawing showing a battery pack according to the first embodiment of the present invention, in which a reinforcing member is inserted into a cell fixing housing.

[0030] FIG. 6 is a drawing showing a battery cell and a reinforcing member inserted into a cell fixing housing in a battery pack according to the first embodiment of the present invention.

[0031] FIG. 7 is a drawing showing a state in which a battery pack according to the first embodiment of the present invention is pressurized by a pressurizing member.

[0032] Fig. 8 is a drawing showing a graph of the degree of deformation of the battery pack according to the pressurization of Fig. 7.

[0033] FIG. 9 is a drawing showing a battery pack according to a comparative example of the present invention being pressurized by a pressurizing member.

[0034] Fig. 10 is a drawing showing the degree of deformation of the battery pack according to the pressure of Fig. 9.

[0035] FIG. 11 is a cross-sectional view showing a battery pack according to the first embodiment of the present invention, in which a fixing screw is inserted into a reinforcing portion.

[0036] FIG. 12 is a drawing showing the internal configurations of a battery pack according to a second embodiment of the present invention.

[0037] Hereinafter, with reference to the attached drawings, preferred embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the invention. However, the present invention may be implemented in various different forms and is not limited or restricted by the following examples.

[0038] In order to clearly explain the present invention, a detailed description of a part that is irrelevant to the description or a related known technology that may unnecessarily obscure the gist of the present invention has been omitted, and when adding reference signs to components of each drawing in this specification, the same or similar reference signs are attached to the same or similar components throughout the specification.

[0039] In addition, terms and words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted as meanings and concepts that conform to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term to explain his or her own invention in the best way.

[0040] Hereinafter, a battery pack according to the present invention will be described with reference to the drawings.

[0041]

[0042] Example 1

[0043] Fig. 1 is a perspective view of a battery pack (10) according to a first embodiment of the present invention, and Fig. 2 is a drawing showing the internal configurations of a battery pack (10) according to the first embodiment of the present invention. Fig. 3 is a cross-sectional view of a battery pack (10) according to the first embodiment of the present invention.

[0044] As illustrated in FIGS. 1 to 3, a battery pack (10) according to a first embodiment of the present invention may include a plurality of battery cells (100), a case (200) forming an internal space (S) in which the plurality of battery cells (100) are accommodated, and a reinforcing member (300) interposed between an inner wall of the case (200) to prevent deformation of the case (200). Here, the reinforcing member (300) may include a first reinforcing member (310) that is in contact with one inner wall of the case (200), a second reinforcing member (320) that is in contact with the other inner wall of the case (200), and a third reinforcing member (330) that is formed thicker than the first and second reinforcing members (310, 320) and connects the first and second reinforcing members (310, 320) between the first and second reinforcing members (310, 320).

[0045] At this time, even if an external impact is applied to the case (200), a significant portion of the external impact transmitted to the reinforcing member (300) through the case (200) can be absorbed by the third reinforcing member (330). Therefore, even under strong external impact, the first and second reinforcing members (310, 320), which are relatively thin, can be prevented from being bent or broken to one side. That is, the reinforcing member (300) having the above structure can withstand strong external impact and continuously support the case (200), thereby effectively preventing deformation and damage to the case (200) due to external impact.

[0046] The battery cell (100) is a rechargeable secondary battery, and may have a structure in which an electrode assembly in which positive and negative electrodes are alternately laminated with a separator in between is accommodated inside an outer material. Here, the electrode assembly may be a jelly-roll type electrode assembly in which a positive electrode, a negative electrode, and a separator are laminated and then rolled in one direction.

[0047] The positive electrode includes a positive electrode current collector and a positive electrode active material coated on the positive electrode current collector, and a region of the positive electrode uncoated with the positive electrode active material among the positive electrode current collectors may be a positive electrode tab. In this case, the positive electrode tab may be electrically connected to the positive electrode lead.

[0048] The negative electrode includes a negative current collector and a negative active material coated on the negative current collector, and a region of the negative current collector that is not coated with the negative active material may be a negative tab. In this case, the negative tab may be electrically connected to the negative lead.

[0049] A separator is a membrane interposed between the anode and cathode to block contact between the two electrodes. It may be composed of an insulating material. At this time, the separator may have numerous pores through which positive ions, such as lithium, can pass.

[0050] The outer case is a case that encloses the electrode assembly and can be configured in various ways. For example, the outer case may be a metal can made of a metal such as aluminum or iron, which may form a space inside to accommodate the electrode assembly.

[0051] Meanwhile, the case (200) forms an empty internal space (S) in which a plurality of battery cells (100) are accommodated, and may be composed of a plurality of members. For example, the case (200) may include an upper plate (220), a lower plate (230), and a connecting plate (210) connecting the upper plate (220) and the lower plate (230) between the upper plate (220) and the lower plate (230).

[0052] Here, the upper plate (220) and the lower plate (230) may have the same horizontal cross-section (ZY direction), and the connecting plate (210) may connect the edge portions of the upper plate (220) and the lower plate (230). At this time, the connecting plate (210) may have various shapes. As illustrated in FIG. 3, the connecting plate (210) may be composed of first to seventh parts (211, 212, 213, 214, 215, 216, 217) to form an internal space (S) having seven corners.

[0053] Meanwhile, the connecting portions connecting the first to seventh parts (211, 212, 213, 214, 215, 216, 217) may be processed into a streamlined shape. In this case, the connecting plate (210) may not have an angled corner portion formed thereon.

[0054] The reinforcing member (300) is interposed between the inner walls of the case (200) to provide outward support to the case (200), thereby preventing the case (200) from being damaged or deformed by external impact. The reinforcing member (300) may be installed at various locations in the inner space (S) of the case (200). For example, as illustrated in FIG. 3, the reinforcing member (300) may be interposed between the first part (211) and the third part (213) constituting the connecting plate (210).

[0055] The reinforcing member (300) may include a first reinforcing member (310) that comes into contact with one inner wall of the case (200); a second reinforcing member (320) that comes into contact with the other inner wall of the case (200); and a third reinforcing member (330) that connects the first and second reinforcing members (310, 320) between the first and second reinforcing members (310, 320). Here, the third reinforcing member (330) may be formed thicker than the first and second reinforcing members (310, 320).

[0056] At this time, even if an external impact is applied to the case (200), a significant portion of the external impact transmitted to the reinforcing member (300) through the case (200) can be absorbed by the third reinforcing member (330). Therefore, even under strong external impact, the first and second reinforcing members (310, 320), which are relatively thin, can be prevented from being bent or broken to one side. That is, the reinforcing member (300) having the above structure can withstand strong external impact and continuously support the case (200), thereby effectively preventing deformation and damage to the case (200) due to external impact.

[0057] The first to third reinforcing members (310, 320, 330) may be provided at various locations in the internal space (S). For example, the third reinforcing member (330) may be provided at the center of the internal space (S), and the first reinforcing member (310) may be provided between the center of the internal space (S) and one inner wall in the width direction of the case (200). In addition, the second reinforcing member (320) may be provided between the center of the internal space (S) and the other inner wall of the case (200).

[0058] Meanwhile, the third reinforcing member (330) may have a rod shape that extends long along the longitudinal direction of the battery cell (100). For example, the third reinforcing member (330) may have a cylindrical rod shape that extends in the longitudinal direction of the battery cell (100). When the third reinforcing member (330) has a cylindrical rod shape, no sharp corner portion is formed on the third reinforcing member (330), thereby preventing a plurality of battery cells (100) arranged around the third reinforcing member (330) from being damaged by contact with the corner portion.

[0059] Here, a through hole (331) may be formed in the third reinforcing member (330) that extends through the third reinforcing member (330) along the direction in which the third reinforcing member (330) extends. Specifically, the through hole (331) may be formed to extend along the central axis of the third reinforcing member (330) in the shape of a cylindrical rod.

[0060] The first reinforcing member (310) and the second reinforcing member (320) are formed on both sides of the third reinforcing member (330), respectively, and may have various shapes. For example, the first reinforcing member (310) may be a plate-shaped member provided between the third reinforcing member (330) and one inner wall in the width direction of the case (200). In addition, the second reinforcing member (320) may be a plate-shaped member provided between the third reinforcing member (330) and the other inner wall in the width direction of the case (200).

[0061] Meanwhile, a pair of openings (221, 231) facing the through hole (331) may be formed in the case (200). Specifically, an upper opening (221) facing the through hole (331) may be formed in the upper plate (220) of the case (200), and a lower opening (231) facing the through hole (331) may be formed in the lower plate (230) of the case (200).

[0062] Here, the upper opening (221), the through hole (331) and the lower opening (231) have the same central axis, so that the upper plate (220), the reinforcing member (300) and the lower plate (230) can be penetrated by a fixing member that fixes the battery pack (10) to a device such as an E-bkie. In this case, the battery pack (10) can be fixed to the device with only one fixing member, so there is an advantageous effect of easily fixing the battery pack (10) to the device.

[0063] As a fixing member, a fixing pin (900) or fixing screw (910) described later may be used. Since most of the volume of the fixing pin (900) or fixing screw (910) is inserted into the through hole (331) described above, installing the battery pack (10) inside a device such as an E-bike may be performed in a space-intensive manner.

[0064] Meanwhile, the battery pack (10) according to the first embodiment of the present invention may include a cell fixing housing (400) that is installed in an internal space (S) and fixes a plurality of battery cells (100). The positions of the plurality of battery cells (100) are fixed by the cell fixing housing (400), so that even when an external impact is applied to the case (200), the plurality of battery cells (100) can be prevented from moving in the internal space (S).

[0065] Meanwhile, Fig. 4 is a cross-sectional view showing a state in which a fixing pin (900) is inserted into a reinforcing member (300). As illustrated in Fig. 4, a vertical through hole (331) is formed in the third reinforcing member (330) constituting the reinforcing member (300), and a vertical housing through hole may be formed in the cell fixing housing (400). Here, the housing through hole formed in the cell fixing housing (400) may face the through hole (331) of the third reinforcing member (330). In addition, an opening (221, 231) facing the through hole (331) of the third reinforcing member (330) may be formed in each of the upper plate (220) and the lower plate (230).

[0066] Here, the diameter of the through hole (331) may be the same as the diameter of the housing through hole and opening (221, 231). In this case, the fixing pin (900) penetrating the lower plate (230), the reinforcing member (300), the cell fixing housing (400), and the upper plate (220) may be fitted into the lower plate (230), the reinforcing member (300), the cell fixing housing (400), and the upper plate (220). Here, the fixing screw (910) may be used as a fixing member for fixing the battery pack (10) to a device such as an E-bkie, and thus has the advantageous effect of firmly fixing the battery pack (10) to the device.

[0067] A battery pack (10) according to the first embodiment of the present invention may include a bus bar (500). The bus bar (500) is a member made of a metal with high electrical conductivity, such as copper or aluminum, and transmits current between a plurality of battery cells (100). A plurality of battery cells (100) installed in an internal space (S) may be welded to the bus bar (500).

[0068] The bus bar (500) may include a first bus bar (510) provided adjacent to the upper plate (220) and a second bus bar (520) provided adjacent to the lower plate (230). Here, the first bus bar (510) may be connected to an electrode tab protruding upwardly from the battery cell (100), and the second bus bar (520) may be connected to an electrode tab protruding downwardly from the battery cell (100).

[0069] A battery pack (10) according to a first embodiment of the present invention may include a cell frame (600) that binds together a plurality of battery cells (100) installed in an internal space (S). The cell frame (600) binds together a plurality of battery cells (100) to protect the battery cells (100) from external impacts such as vibrations, and may be made of various materials. For example, the cell frame (600) may be made of an insulator such as plastic. In addition, the cell frame (600) may have a structure in which an insulating layer is formed on the surface of a metal substrate such as aluminum.

[0070] The battery pack (10) according to the first embodiment of the present invention may include a connector insertion portion (700). The connector insertion portion (700) is where an external connector, such as a charging connector, is inserted, and may be formed at various locations of the battery pack (10). For example, the connector insertion portion (700) may be formed on one side of the upper plate (220) constituting the case (200) of the battery pack (10).

[0071] Meanwhile, Fig. 5 is a drawing showing a reinforcing member (300) inserted into a cell fixing housing (400). Fig. 5 illustrates a transverse cross-section of the cell fixing housing (400) and the reinforcing member (300). Referring to Fig. 5, the reinforcing member (300) composed of the first to third reinforcing members (310, 320, 330) can be inserted into the interior of the cell fixing housing (400). In this case, the reinforcing member (300) can be interposed between the inner walls of the case (200) while being inserted into the interior of the cell fixing housing (400).

[0072] In addition, the cell fixing housing (400) may be formed with a plurality of cell fixing holes (410) into which battery cells (100) are respectively fixed. Here, the cell fixing holes (410) may have a shape corresponding to the battery cell (100) being inserted. For example, when the battery cell (100) is a cylindrical cell, the cell fixing housing (400) may be formed with a plurality of cylindrical cell fixing holes (410).

[0073] Meanwhile, Fig. 6 is a drawing showing a battery cell (100) and a reinforcing member (300) inserted into a cell fixing housing (400). As illustrated in Fig. 6, a reinforcing member (300) composed of first to third reinforcing members (310, 320, 330) and a plurality of battery cells (100) can be inserted into the cell fixing housing (400). At this time, the aforementioned fixing pin (900) can be inserted into the third reinforcing member (330).

[0074] The third reinforcing member (300) is completely inserted into the cell fixing housing (400), and portions of the first and second reinforcing members (310, 320) may protrude to one side and the other side of the cell fixing housing (400). Here, the protruding portions of the first and second reinforcing members (310, 320) may be fitted between the inner walls of the case (200).

[0075] The first reinforcing member (310) and the second reinforcing member (320) inserted into the cell fixing housing (400) may have various thicknesses. For example, the thickness (d1) of the first reinforcing member (310) may be 2.5 to 3.5 mm. Additionally, the thickness (d2) of the second reinforcing member (320) may be 2.5 to 3.5 mm.

[0076] The third reinforcing member (330) may also have various thicknesses. The third reinforcing member (330) has a cylindrical shape that extends long along the longitudinal direction of the battery cell (100) inside the case (200), and the thickness (d3) of the third reinforcing member (330) may be 4 to 5 mm. Specifically, the thickness (d3) of the third reinforcing member (330) is equal to the distance between the through hole (331) formed in the third reinforcing member (330) and the outer surface of the third reinforcing member (330), which may be 4 to 5 mm.

[0077] Meanwhile, the case (200) may be composed of various materials. For example, the case (200) may be composed of a metal material such as aluminum or an aluminum alloy. In this case, the case (200) is composed of a metal material having high rigidity, so that the case (200) can be prevented from being destroyed even when a strong external force is applied to the case (200).

[0078] In addition, the case (200) may be made of a plastic material. At this time, a reinforcing member (300) may be interposed in the internal space (S) of the case (200). In this case, since the case (200) is made of a lightweight plastic material, the overall weight of the battery pack (10) can be reduced and the energy density of the battery pack (10) can be increased. In particular, since the reinforcing member (300) is interposed in the interior of the case (200), even though the case (200) is made of a plastic material, it is possible to prevent the case (200) from being easily destroyed by external force.

[0079] Meanwhile, the reinforcing member (300) may be formed of a metal material having high rigidity. For example, the first to third reinforcing members (310, 320, 330) constituting the reinforcing member (300) may be formed of a metal material such as aluminum, an aluminum alloy, or stainless steel. In this case, since the reinforcing member (300) has high rigidity, even when a large force is instantaneously applied to the reinforcing member (300), the reinforcing member (300) can be prevented from being destroyed.

[0080] Meanwhile, FIG. 7 is a drawing showing a state in which a battery pack (10) according to a first embodiment of the present invention is pressed by a pressing member (800). Specifically, FIG. 7 shows a state in which a pressing member (800) formed of a rigid body presses a case (200) of a battery pack (10). Here, a plurality of battery cells (100) are accommodated in an internal space (S) of the case (200), and a reinforcing member (300) that supports the case (200) outward is interposed in the internal space (S). In addition, the reinforcing member (300) is made of aluminum or an aluminum alloy material, and the case (200) is made of a plastic material. A through hole is formed in a thick portion at the center of the reinforcing member (300).

[0081] Fig. 8 is a drawing showing a degree of deformation of a battery pack (10) according to the pressurization of Fig. 7 in a graph. The X-axis of Fig. 8 represents the degree of deformation of the case (200) of the battery pack (10), and the Y-axis of Fig. 8 represents the magnitude of the pressure applied by the pressurizing member (800) to the case (200) of the battery pack (10).

[0082] As a result of pressurizing a case (200) having a reinforcing member (300) installed by a pressurizing member (800) composed of a rigid body, it was confirmed that as the pressure applied by the pressurizing member (800) to the case (200) increased, the degree of deformation of the case (200) increased. Specifically, when the pressurizing member (800) applied a pressure of 36,651 N in the Y-axis direction to the case (200), the pressed portion of the case (200) deformed by 0.8 mm in the Y-axis direction.

[0083] In addition, when the pressurizing member (800) applied a pressure of 101,047 N to the case (200) in the Y-axis direction, the pressurized portion of the case (200) was deformed by 9.6 mm in the Y-axis direction. At this time, it can be confirmed that the reinforcing member (300) installed inside the case (200) was destroyed at the moment when the case (200) was deformed by 5.2 mm in the Y-axis direction.

[0084] Fig. 9 is a drawing showing a state in which a battery pack (10') according to a comparative example of the present invention is pressed by a pressing member (800'). The battery pack (10') according to the comparative example of the present invention is different from the battery pack (10) according to the first embodiment of the present invention in that a reinforcing member (300) is not installed inside the case (200').

[0085] Specifically, FIG. 9 illustrates a pressurizing member (800´) made of a rigid body pressurizing a case (200´) of a battery pack (10´). A plurality of battery cells (100´) are accommodated inside the case (200´), and the case (200´) is made of a plastic material.

[0086] FIG. 10 is a drawing showing a degree of deformation of a battery pack (10´) according to the pressure of FIG. 9, in which the X-axis of FIG. 10 shows the degree of deformation of the case (200´) of the battery pack (10´), and the Y-axis of FIG. 10 shows the size of the pressure applied by the pressure member (800´) to the case (200´) of the battery pack (10´).

[0087] As a result of pressurizing the case (200´) with a pressurizing member (800´) composed of a rigid body, it was confirmed that as the pressure applied by the pressurizing member (800´) to the case (200´) increased, the degree of deformation of the case (200´) increased. Specifically, when the pressurizing member (800´) applied a pressure of 39,228 N to the case (200´) in the Y-axis direction, the pressed portion of the case (200´) was deformed by 6.9 mm in the Y-axis direction. In addition, when the pressurizing member (800´) applied a pressure of 100,229 N to the case (200´) in the Y-axis direction, the pressed portion of the case (200´) was deformed by 17.3 mm in the Y-axis direction.

[0088] Comparing the first embodiment of the present invention and the comparative example of the present invention, the battery pack (10) according to the first embodiment of the present invention was deformed by 0.8 mm under a pressure of 36,651 N (see FIG. 8), whereas the battery pack (10') according to the comparative example of the present invention was deformed by 6.9 mm under a pressure of 39,228 N (see FIG. 10). In addition, the battery pack (10) according to the first embodiment of the present invention was deformed by 9.6 mm under a pressure of 101,047 N, whereas the battery pack (10') according to the comparative example of the present invention was deformed by 17.3 mm under a pressure of 100,229 N. That is, it can be confirmed that when external pressure is applied, the battery pack (10) according to the first embodiment of the present invention is deformed significantly less than the battery pack (10') according to the comparative example of the present invention.

[0089] Meanwhile, the first to third reinforcing parts (310, 320, 330) constituting the reinforcing part (300) may be made of a plastic material. Here, the first and second reinforcing parts (310, 320) may be heat-fused to the case (200) made of a plastic material. In this case, the reinforcing part (300) is heat-fused to the case (200) as a single member, so that it can be firmly combined with the inner surface of the case (200), and even when an external force is applied to the case (200), the reinforcing part (300) can be prevented from being separated from the case (200).

[0090] Fig. 11 is a cross-sectional view showing a state in which a fixing screw (910) is inserted into a reinforcing member (300). As illustrated in Fig. 11, a vertical through hole (331) is formed in the third reinforcing member (330) constituting the reinforcing member (300), and a vertical housing through hole may be formed in the cell fixing housing (400). Here, the housing through hole formed in the cell fixing housing (400) may face the through hole (331) of the third reinforcing member (330). In addition, an opening (221, 231) may be formed in each of the upper plate (220) and the lower plate (230) to face the through hole (331) of the third reinforcing member (330).

[0091] At this time, a screw thread (331a) may be formed on the inner surface of the through hole (331) of the third reinforcing member (330). In this case, the fixing screw (910) may penetrate the lower plate (230), the cell fixing housing (400), and the upper plate (220) while being screwed to the reinforcing member (300). The fixing screw (910) may be used as a fixing member for fixing the battery pack (10) to a device such as an E-bkie, and thus has the advantageous effect of firmly fixing the battery pack (10) to the device.

[0092]

[0093] Second Example

[0094] The battery pack according to the second embodiment of the present invention differs from the first embodiment in that it has multiple reinforcing members installed inside the case. The second embodiment will be described with a focus on differences, omitting any commonalities with the first embodiment as much as possible. It should be noted that any details not described in the second embodiment, if necessary, may be considered as those described in the first embodiment.

[0095] Fig. 12 is a drawing showing the internal configurations of a battery pack (10) according to a second embodiment of the present invention. As illustrated in Fig. 12, in the battery pack (10) according to the second embodiment of the present invention, a plurality of reinforcing members (300) may be interposed between the inner walls of the case (200).

[0096] Here, each reinforcing member (300) may include a first reinforcing member (310) in contact with one inner wall of the case (200), a second reinforcing member (320) in contact with the other inner wall of the case (200), and a third reinforcing member (330) connecting the first and second reinforcing members (310, 320) between the first and second reinforcing members (310, 320). The third reinforcing member (330) may be formed thicker than the first and second reinforcing members (310, 320).

[0097] A plurality of reinforcing members (300) interposed within the case (200) are arranged along the longitudinal direction of the case (200), and each reinforcing member (300) can be interposed between the inner walls of the case (200) in the width direction. In this case, a plurality of reinforcing members (300) are interposed between the inner walls of the case (200) to support the case (200) outwardly, thereby effectively preventing the case (200) from being damaged by external impact.

[0098] At this time, a through hole (331) may be formed in each of the plurality of reinforcing parts (300). The through hole (331) may be formed in the third reinforcing part (330) having the thickest thickness among the reinforcing parts (300). Here, the third reinforcing part (330) has a cylindrical rod shape, and the through hole (331) may penetrate the third reinforcing part (330) along the central axis of the third reinforcing part (330).

[0099] Additionally, a plurality of openings (221, 231) may be formed in the case (200). Specifically, a plurality of upper openings (221) facing the through holes (331) may be formed in the upper plate (220). Additionally, a plurality of lower openings (231) facing the through holes (331) may be formed in the lower plate (230).

[0100]

[0101] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and various embodiments are possible within the scope equivalent to the technical idea of ​​the present invention and the patent claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

[0102]

[0103] [Explanation of symbols]

[0104] 10: Battery pack 100: Battery cell

[0105] 200: Case 210: Connecting Plate

[0106] 220: Upper plate 230: Lower plate

[0107] 300: Reinforcement 310: First Reinforcement

[0108] 320: Second Reinforcement Section 330: Third Reinforcement Section

[0109] 400: Cell fixing housing 410: Cell mounting hole

[0110] 500: Busbar 510: 1st Busbar

[0111] 520: Second busbar 600: Cell frame

[0112] 610: First cell frame 620: Second cell frame

[0113] 700: Connector insert 800: Pressurized member

[0114] 900: Fixed pin 910: Fixed screw

[0115] S: Interior space

Claims

1. Multiple battery cells; A case forming an internal space in which the plurality of battery cells are accommodated; and It includes a reinforcing member interposed between the inner walls of the case to prevent deformation of the case, The above reinforcement part, A first reinforcing member in contact with one inner wall of the case; A second reinforcing member in contact with the inner wall of the other side of the case; and A third reinforcing member is formed thicker than the first and second reinforcing members and connects the first and second reinforcing members between the first and second reinforcing members. The third reinforcing member has a rod shape extending in the longitudinal direction of the battery cell, A battery pack characterized in that the third reinforcing member includes a through hole formed along the direction in which the third reinforcing member extends.

2. In claim 1, A battery pack characterized in that a pair of openings facing the through hole are formed in the case.

3. In claim 1, The above first reinforcing member is a plate-shaped member provided between the third reinforcing member and one inner wall in the width direction of the case, A battery pack characterized in that the second reinforcing member is a plate-shaped member provided between the third reinforcing member and the inner wall of the other side in the width direction of the case.

4. In claim 3, The thickness of the third reinforcement part is 4 to 5 mm, A battery pack, characterized in that the thickness of the first and second reinforcing parts is 2.5 to 3.5 mm.

5. In claim 2, A battery pack characterized in that the diameter of the above through hole is the same as the diameter of the above opening.

6. In claim 1, A battery pack characterized in that a screw thread is formed on the inner surface of the above through hole.

7. In claim 1, A battery pack characterized in that the above case is made of plastic material.

8. In claim 1, A battery pack characterized in that the first to third reinforcing parts are made of a metal material.

9. In claim 7, A battery pack characterized in that the first to third reinforcing parts are made of a plastic material.

10. In claim 9, A battery pack characterized in that the first and second reinforcing parts are fused to the case.

11. Multiple battery cells; A case forming an internal space in which the plurality of battery cells are accommodated; A reinforcing member interposed between the inner walls of the case to prevent deformation of the case; and It is installed in the above internal space and includes a cell fixing housing that fixes the plurality of battery cells, The above reinforcement part, A first reinforcing member in contact with one inner wall of the case; A second reinforcing member in contact with the inner wall of the other side of the case; and A battery pack including a third reinforcing member formed thicker than the first and second reinforcing members and connecting the first and second reinforcing members between the first and second reinforcing members.

12. In claim 11, A battery pack characterized in that the cell fixing housing has a cell fixing hole formed therein in which the battery cell is fixed.

13. In claim 11, A battery pack characterized in that the reinforcing member is interposed between the inner walls of the case while being inserted into the cell fixing housing.

14. In claim 1, A battery pack characterized in that a plurality of reinforcing members are interposed between the inner walls of the case.

Images