Battery pack with improved ventilation

Abstract

The present invention provides a battery pack structure comprising a plurality of battery modules arranged side by side along the width direction, wherein at least one battery module has an open-front shape and includes a rear cover made of a heat-resistant material connected to the rear of the battery module, the rear cover including a pair of partition plates extending rearward from both sides in the width direction of the rear end of the battery module and upward-facing vent holes.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0066904 filed on May 24, 2023, and the contents disclosed in the documents of the Korean patent application are all included as part of this specification.

[0002] The present invention relates to a battery pack with improved vents, and more particularly, to a battery pack in which thermal runaway is prevented and the vent direction is controlled.

Background Art

[0003] Rechargeable batteries, which are highly applicable according to product groups and have electrical characteristics such as high energy density, are widely applied not only to portable devices but also to electric vehicles, hybrid vehicles, or power storage devices driven by an electric drive source. These rechargeable batteries are not only primarily advantageous in that they can significantly reduce the use of fossil fuels, but also environmentally friendly in that they do not generate any by-products from the use of energy and are attracting attention as a new energy source for improving energy efficiency.

[0004] One or two or three battery cells are used per device for small mobile devices, whereas high power and large capacity are required for medium and large-sized devices such as automobiles. Therefore, medium and large-sized battery modules in which a large number of battery cells are electrically connected are used.

[0005] Medium and large-sized battery modules are preferably manufactured to be small in size and weight if possible, so they can be stacked with a high degree of integration, and prismatic batteries, pouch-type batteries, etc., which are light in weight relative to their capacity, are mainly used as the battery cells of medium and large-sized battery modules.

[0006] Figure 1 shows the structure of a typical battery module and the direction of venting at the rear, and Figure 2 shows a cross-section of Figure 1. Referring to these drawings, a typical battery module 1 is formed by housing multiple stacked battery cells 14 within a housing. The housing generally consists of a U-frame 11, a top plate 13, and a pair of end plates 12. The end plates 12 may have a double structure consisting of a metal portion 122 that joins to the U-frame 11 and an injection portion 121 that insulates the metal portion 122 from the battery cells 14 inside.

[0007] The battery cell 14 is at risk of igniting due to impact, short circuit, etc. The resulting high-temperature gas and dust can be discharged from the battery module 1. At this time, the gas and dust can be discharged to the rear through the joint between the metal part 122 and the U-frame 11 and the injection part 121 which are exposed to the outside.

[0008] Figures 3 and 4 show the structure of a battery pack containing the battery module shown in Figure 1, and how heat propagation occurs in the rear space, respectively. Referring to these drawings, multiple battery modules 1 can be assembled and housed in a pack frame 4 to constitute a battery pack (P). Gas and dust emitted from the battery modules 1 can be discharged to the outside of the pack frame 4 through the rear space 41 between the pack frame 4 and each battery module 1, and through a vent device (not shown) provided in the pack frame 4 that connects the inside and outside of the pack frame 4.

[0009] At this time, the gas emitted from the battery module 1 is extremely hot, and there is a risk that other battery modules may ignite due to this high-temperature gas. Furthermore, in order for the gas to be emitted through the vent device, the gas emitted from the battery module 1 needs to be guided upward, but the rear space 41 causes the gas emitted from the battery module 1 to spread laterally, allowing heat to be transmitted to other battery modules, which can cause a chain reaction of ignition between modules.

[0010] Furthermore, at this time, the dust released upward through the rear space may block the vent path including the vent device, making further venting difficult. [Overview of the Initiative] [Problems that the invention aims to solve]

[0011] The present invention was conceived against the background of the prior art described above, and aims to provide a battery module structure that prevents heat propagation between multiple battery modules built into a battery pack. More specifically, the present invention aims to provide a battery pack structure that prevents heat propagation from occurring when high-temperature gas and / or flames discharged from the rear of one battery pack reach other adjacent battery modules.

[0012] A further technical problem of the present invention is to provide a battery module structure that can guide high-temperature gases and dust discharged from inside the battery module to be discharged in a specific direction. For example, the present invention aims to provide a battery pack structure that guides gases discharged to the front and rear of the battery module to be discharged upward.

[0013] The present invention also aims to provide a structure for a battery module and a battery pack in which the emitted gas can be cooled.

[0014] The present invention also aims to provide battery module and battery pack structures in which venting is delayed, preventing the generation of flames due to the outflow of sparks.

[0015] Furthermore, yet another technical problem addressed by the present invention is to provide a battery pack structure that prevents vent blockage and ignition due to dust.

[0016] The technical problems of the present invention are not limited to the objectives mentioned above. Other objectives and advantages of the present invention not mentioned can be understood from the following description and more clearly from the embodiments of the present invention. Furthermore, it is readily apparent that the objectives and advantages of the present invention can be achieved by the means and combinations thereof described in the claims. [Means for solving the problem]

[0017] To solve the aforementioned problems, the present invention provides a battery pack structure comprising a plurality of battery modules arranged side by side along the width direction, wherein at least one battery module has an open front shape and includes a rear cover made of a heat-resistant material connected to the rear of the battery module, the rear cover including a pair of partition plates extending rearward from both sides in the width direction of the rear end of the battery module and upward-facing vent holes.

[0018] The battery pack may include a pack frame and a plurality of battery modules housed adjacent to each other within the pack frame. The battery modules may include two or more battery modules that are adjacent to each other in the width direction, with their rear ends facing the same direction.

[0019] The battery module may include a stack of battery cells and a housing that accommodates it. The housing may include a U-frame that is open at the top and front and rear, a top plate that covers the top of the U-frame, and a pair of end plates that cover the front and rear of the U-frame.

[0020] The rear cover may be made of a heat-resistant material. The rear cover according to one embodiment of the present invention may include mica material.

[0021] The front of the rear cover may be left open and connected to the rear of the battery module. Furthermore, it is preferable that the lower part of the rear cover be left open as well as the front.

[0022] The rear cover may include an upper plate that connects the upper end portions of the pair of partition plates to cover the upper part of the rear cover. At this time, the vent hole may be provided in the upper plate.

[0023] Alternatively, the rear cover may include a rear plate that connects the rear end portions of the pair of partition plates to cover the rear part of the rear cover.

[0024] The rear cover according to an embodiment of the present invention may have a box shape that is substantially open at the front and bottom. Thereby, the gas discharged rearward from the battery module can flow into the interior of the rear cover from the open front, and be discharged above the rear cover through the vent hole. Also, thereby, the dust discharged rearward from the battery module can flow into the interior of the rear cover from the open front, and fall below the rear cover through the open bottom. Since the discharge path of the gas bends from the rear upward, the gas can lose a part of its energy and be cooled and discharged.

[0025] The partition plate can isolate the rear space of the battery module from both sides in its width direction. The partition plate can isolate the rear space of the battery module from both sides in its width direction in at least a partial section in the height direction. At this time, the partition plate can cover a part of both side surfaces in the width direction of the battery module.

[0026] The rear cover may be connected to the rear of the battery module. For example, the rear cover may be connected to the rear side end plate. Alternatively, the rear cover may be connected to the U-frame or the top plate.

[0027] The rear cover may be fastened to a first fastening hole provided in the battery module. The first fastening hole may be provided at the rear end of the battery module so as to face upward. For example, the first fastening hole may be provided in the end plate, or may be provided in the top plate or the U-frame.

[0028] At this time, the rear cover may be provided with a second fastening hole so as to face upward. Preferably, the second fastening hole may be provided in the upper plate together with the vent hole.

[0029] The rear cover according to an embodiment of the present invention can be fastened to the battery module by a fastening member that simultaneously penetrates a first fastening hole provided in the end plate so as to face upward and the second fastening hole provided in the upper plate, with the upper plate of the rear cover covering a part of the upper surface of the battery module. The fastening member may be a normal fastening member such as a bolt or a push rivet, but is not limited thereto. For example, the fastening member may be a click-fit protrusion provided as a part of the rear cover or the battery module.

[0030] The rear cover may include a melting frame. The melting frame may have a predetermined melting point lower than the melting point of the rear cover. The melting frame according to an embodiment of the present invention may include a PC (Polycarbonate) material.

[0031] The melting frame may be provided so as to face the inner surface or the surface of the rear cover. Preferably, the melting frame may be provided in combination with the rear cover so as to face the inside of the rear cover.

[0032] The melting frame may include a vent delay portion that covers the vent hole.

[0033] The molten frame according to one embodiment of the present invention may substantially have a box shape with its front and rear ends open, and the vent delay portion is provided on the upper plate of the molten frame which is provided below the upper plate of the rear cover, so that the vent hole can be covered from below.

[0034] The vent delay portion may be formed with a thinner thickness than other parts of the molten frame. This allows the vent delay portion to melt faster and more completely than other parts of the molten frame when heated above its melting point.

[0035] According to one embodiment of the present invention, the upper and lower plates of the molten frame may be formed to be thinner than the side plates. When heated above their melting point, the upper and lower plates of the molten frame can melt faster and more completely than other parts of the molten frame. As a result, when venting occurs in the battery module, the gas discharged from the battery module can be discharged above the rear cover, and the dust discharged from the battery module can fall below the rear cover. In this case, these vents may occur with a delay during the time it takes for the upper and lower plates of the molten frame to melt.

[0036] The vent holes may be covered with a mesh or formed in a mesh-like manner. Alternatively, the vent holes may be formed in a slit shape. By discharging the gas from the battery module through small mesh or slit-like openings as described above, the discharge can be delayed and cooled by the throttling action before being discharged.

[0037] The present invention also provides an automobile structure incorporating the battery pack. The battery pack can be incorporated as a power source in an electric vehicle or a hybrid vehicle. According to one embodiment of the present invention, gas vented upward from the battery module can be discharged from the inside to the outside of the pack frame through a venting device provided on the pack frame. [Effects of the Invention]

[0038] By means of solving the aforementioned problems, the present invention can provide a battery pack structure that prevents heat transfer between modules by gas discharged from the rear of the battery module.

[0039] Furthermore, the present invention can provide battery module and battery pack structures in which the vent is delayed and guided upward.

[0040] Another advantage of the present invention is that it can provide battery module and battery pack structures in which spark leakage is prevented and the possibility of ignition is reduced.

[0041] The present invention can also provide battery module and battery pack structures that allow high-temperature gases to be cooled and discharged.

[0042] The present invention can also provide a battery pack structure in which the possibility of vent path blockage and ignition due to dust is significantly reduced.

[0043] In addition, the present invention may have various other effects, which will be described in each embodiment, or the description will be detailed for effects that can be easily inferred by an ordinary person. [Brief explanation of the drawing]

[0044] [Figure 1] This diagram shows the structure of a typical battery module and the direction of venting at the rear. [Figure 2] This figure shows a cross-section of Figure 1. [Figure 3] This diagram shows the structure of a battery pack that incorporates the battery module shown in Figure 1. [Figure 4] This figure shows how heat propagation occurs in the space behind the battery pack shown in Figure 3. [Figure 5]This figure shows how a battery module and a rear cover are connected to each other according to one embodiment of the present invention. [Figure 6] This figure shows how a battery module and a rear cover are connected to each other according to one embodiment of the present invention. [Figure 7] This figure shows how a battery module and a rear cover are connected to each other according to one embodiment of the present invention. [Figure 8] This figure shows a cross-section of a rear cover and molten frame according to one embodiment of the present invention. [Figure 9] This figure shows how a battery module and a rear cover are fastened together according to one embodiment of the present invention. [Figure 10] This figure shows how a battery module and a rear cover are fastened together according to one embodiment of the present invention. [Figure 11] This figure shows the structure of a molten flame before melting according to one embodiment of the present invention. [Figure 12] This figure shows a cross-section of Figure 11. [Figure 13] This figure shows the structure of a molten flame after melting according to one embodiment of the present invention. [Figure 14] This figure shows a cross-section of Figure 13. [Figure 15] This figure shows the venting and heat transfer prevention effects of a battery module according to one embodiment of the present invention. [Figure 16] This figure shows the venting and heat transfer prevention effects of a battery pack according to one embodiment of the present invention. [Figure 17] This figure shows the heat propagation prevention effect of a battery pack according to one embodiment of the present invention. [Figure 18] This figure shows how the battery module and the rear cover are connected to each other according to another embodiment of the present invention. [Figure 19] This figure shows how the battery module and the rear cover are connected to each other according to another embodiment of the present invention. [Figure 20] This figure shows the structure of a battery module according to another embodiment of the present invention. [Figure 21]This figure shows a cross-section of Figure 20. [Figure 22] This figure shows another embodiment of the present invention, illustrating the venting and heat transfer prevention effects of another battery module. [Figure 23] This figure shows the venting and heat transfer prevention effects of a battery pack according to another embodiment of the present invention. [Figure 24] This figure shows the venting and heat transfer prevention effects of a battery pack according to another embodiment of the present invention. [Figure 25] This figure shows the structure of an automobile incorporating a battery pack according to the present invention. [Modes for carrying out the invention]

[0045] The aforementioned objectives, features, and advantages will be described in detail below with reference to the accompanying drawings, so that a person with ordinary skill in the art to which the present invention pertains can easily implement the technical concept of the present invention. In describing the present invention, if a specific description of known technology according to the present invention is deemed to obscure the gist of the present invention, the detailed description will be omitted. Hereafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings are used to indicate the same or similar components.

[0046] Although terms like "first," "second," etc., are used to describe various components, these components are, of course, not limited by these terms. These terms are simply used to distinguish one component from another, and unless otherwise stated, the first component may also be the second component.

[0047] In the entire specification, unless otherwise stated, each component may be singular or plural.

[0048] In the following, the placement of any configuration "above (or below)" a component or "above (or below)" a component means not only that the configuration faces the upper (or lower) surface of the component, but also that other configurations may be interposed between the component and any configuration placed on (or below) it.

[0049] Furthermore, where it is stated that one component is “linked,” “joined,” or “connected” to another component, it should be understood that the components may be directly linked or connected to one another, but may also be “interposed” between each component, or each component may be “linked,” “joined,” or “connected” through other components.

[0050] In this specification, singular expressions include plural expressions unless the context clearly indicates otherwise. Terms such as “composed of” or “including” in this application should not be interpreted as necessarily including all of the multiple components or stages described in the specification, and some of them may not be included, or may include further components or stages.

[0051] In the entire specification, "A and / or B" means A, B, or A and B unless otherwise specified, and "C to D" means C or greater and D or less unless otherwise specified.

[0052] Figure 1 shows the structure of a typical battery module. Referring to this, the battery module 1 may include a plurality of battery cells 14 and a housing that houses them. The housing may include a U-frame 11 that is open at the top and front and rear, a top plate 13 that covers the top of the U-frame 11, and a pair of end plates 12 that cover the front and rear of the U-frame 11, respectively.

[0053] Figure 2 shows a cross-section of Figure 1. Referring to this, the end plate 12 may include a metal portion 122 that is joined to the U-frame 11, and an injection portion 121 that is located inward from the metal portion 122 and electrically insulates the metal portion 122 and the battery cell 14 from each other.

[0054] Referring to Figures 1 and 2, if the battery cell 14 ignites, the injection section 121 melts, and high-temperature gas and dust can be discharged to the rear of the battery module 1 through the joint between the end plate 12 and the U-frame 11 and the exposed portion of the injection section 121. The discharged gas can transfer heat to other battery modules through the space behind the battery module 1, and the discharged dust can be discharged along with the gas to close the vent path.

[0055] The present invention provides a battery pack structure that incorporates multiple battery modules 1 as described above, in which heat propagation is prevented and ventilation is improved, and a structure for an automobile incorporating the same.

[0056] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0057] <Example 1> Figures 5 to 7 show how a battery module and a rear cover are connected to each other according to one embodiment of the present invention. Referring to these drawings, the battery module according to one embodiment of the present invention may also include a rear cover 2 and a molten frame 24.

[0058] The rear cover 2 may be made of a heat-resistant material. The rear cover 2 according to one embodiment of the present invention may include mica material.

[0059] The front of the rear cover 2 may be open and connected to the rear of the battery module. Furthermore, it is preferable that the lower part of the rear cover 2 be open, similar to the front.

[0060] The rear cover 2 may include an upper plate 21 that connects the upper ends of the pair of partition plates 23 to each other and covers the upper part of the rear cover 2. In this case, upward-facing vent holes 211 may be provided in the upper plate 21.

[0061] Furthermore, the rear cover 2 may include a thick plate 22 that connects the rear ends of the pair of partition plates 23 to each other and covers the rear of the rear cover 2.

[0062] The partition plate 23 can isolate the space behind the battery module from both sides in the width direction. The partition plate 23 can isolate the space behind the battery module from both sides in the width direction in at least a portion of the height direction. In this case, the partition plate 23 can cover a portion of both sides of the battery module in the width direction.

[0063] In one embodiment of the present invention, the rear cover 2 may have a box shape that is substantially open at the front and bottom. This allows the gas discharged from the battery module to the rear to flow into the interior of the rear cover 2 from the open front and be discharged upward through the vent hole 211. In addition, this allows the dust discharged from the battery module to flow into the interior of the rear cover 2 from the open front and fall downward through the open bottom. As the gas discharge path curves upward from the rear, the gas loses some of its energy and can be discharged after cooling.

[0064] Furthermore, according to this embodiment, the space behind the battery module is isolated in the width direction from other battery modules by the partition plate, thereby preventing the gas from transmitting heat to other battery modules through the space behind it.

[0065] The molten frame 24 may have a predetermined melting point that is lower than the melting point of the rear cover 2. The molten frame 24 according to one embodiment of the present invention may include PC (Polycarbonate) material.

[0066] The molten frame 24 may be provided so as to face the inner or outer surface of the rear cover 2. Preferably, the molten frame 24 may be provided coupled to the rear cover 2 so as to face the inside of the rear cover 2.

[0067] The molten frame 24 may include a vent delay section 241 that covers the vent hole 211. The vent delay section 241 may be provided to prevent gas communication through the vent hole 211 when it is not molten.

[0068] Figure 8 shows a cross-section of a rear cover and molten frame according to one embodiment of the present invention. Referring to this, the vent delay portion 241 may be formed with a thinner thickness than other parts of the molten frame 24. As a result, when heated above its melting point, the vent delay portion 241 can melt faster and more completely than other parts of the molten frame 24.

[0069] According to one embodiment of the present invention, the molten frame 24 may have a box shape with substantially open front and rear sides, and the vent delay portion 241 is provided on the upper plate 241 of the molten frame which is provided below the upper plate 21 of the rear cover 2, so that the vent hole can be covered from below. In this case, the upper plate 241 and bottom plate 242 of the molten frame 24 may be formed to be thinner than the side plates 243.

[0070] Figures 9 and 10 show how a battery module and a rear cover are fastened to each other according to one embodiment of the present invention. Referring to these drawings, the rear cover 2 can be fastened to a first fastening hole 10 provided in the battery module. The first fastening hole 10 may be provided at the rear end of the battery module so as to face upward. For example, the first fastening hole 10 may be provided in the end plate 12, the top plate 13, or the U-frame 11.

[0071] In this case, the rear cover 2 may be provided with a second fastening hole 20 facing upward. Preferably, the second fastening hole 20 may be provided in the upper plate 21 of the rear cover 2 together with the vent hole 211.

[0072] In one embodiment of the present invention, the rear cover 2 has an upper plate that covers a portion of the upper surface of the battery module and can be fastened to the battery module by a fastening member 30 that simultaneously penetrates the first fastening hole 10 provided in the end plate 12 so as to face upward and the second fastening hole 20 provided in the upper plate. The fastening member 30 may be, but is not limited to, a conventional fastening member 30 such as a bolt or a push rivet. For example, the fastening member 30 may be a click-fit projection provided as part of the rear cover 2 or the battery module.

[0073] Figures 11 and 12 show the structure of a molten frame before melting and a cross-section thereof according to one embodiment of the present invention, and Figures 13 and 14 show the structure of a molten frame after melting and a cross-section thereof according to one embodiment of the present invention. Referring to these drawings, the upper plate 241 and bottom plate 242 of the molten frame can melt faster and more completely than other parts of the molten frame 24 when heated above their melting point. As a result, when venting occurs in the battery module, the gas discharged from the battery module can be discharged above the rear cover 2, and the dust discharged from the battery module can fall below the rear cover 2. At this time, these vents may occur with a delay during the time it takes for the upper plate 241 and bottom plate 242 of the molten frame to melt.

[0074] Figure 15 shows the venting and heat propagation prevention functions of a battery module according to one embodiment of the present invention, and Figures 16 and 17 show the venting and heat propagation prevention functions of a battery pack according to one embodiment of the present invention, respectively. Referring to these drawings, a battery pack (P) can be formed by arranging a plurality of the battery modules 1 side by side in the width direction and housing them in a pack frame 4. Terminals are provided at the front of the battery modules 1 to electrically connect them, and a rear space 41 may be provided between the rear of the battery modules 1 and the pack frame 4. Gas and dust discharged from the battery modules 1 can be vented through the rear space.

[0075] After the upper plate 241 and bottom plate 242 of the molten frame have melted, the side plate 243 can fall down. The side plate 243, together with the partition plate 23 of the rear cover, can isolate the rear space 41 from both sides in its width direction, thereby preventing heat transfer laterally by gas.

[0076] Furthermore, the gas discharged from the battery module 1 flows into the rear space 41 and, after a delay of the time required for the vent delay section 241 to melt, can be vented upward through the vent hole 211. At this time, the gas can be cooled and discharged as its vent path makes a single bend.

[0077] Furthermore, the pack frame 4 according to one embodiment of the present invention may be provided with a vent device (not shown) for discharging gas and dust discharged from the battery module 1. In this case, the dust is discharged to the rear of the battery module 1 and falls below the rear cover 2, so there is no risk of the vent device being blocked.

[0078] Figure 25 shows the structure of an automobile incorporating the battery pack according to the present invention. Referring to this, the battery pack (P) can be incorporated into an automobile (V) as a power source. The automobile (V) may be an electric vehicle or a hybrid vehicle.

[0079] <Example 2> In this embodiment, the parts not described separately are the same as in Embodiment 1.

[0080] Figures 18 and 19 show how a battery module and a rear cover are connected to each other according to another embodiment of the present invention, and Figures 20 and 21 show the structure of a battery module and a cross-section thereof according to another embodiment of the present invention, respectively. Referring to these drawings, the vent hole 211 in the other embodiment of the present invention may be covered with a mesh or formed in a mesh shape. Alternatively, the vent hole 211 may be formed in a slit shape. However, the shape of the vent hole 211 in this embodiment is not limited to these, and it is sufficient if it is formed in the shape of a small opening having a width or area of ​​a predetermined or less.

[0081] According to another embodiment of the present invention, the molten flame 24 may not be provided separately.

[0082] According to another embodiment of the present invention, by forming the vent hole 211 to be small, the flow rate of gas discharged through the vent hole 211 can be reduced, and a vent delay effect can be obtained even without separately providing the molten flame 24. Furthermore, according to this embodiment, the gas discharged to the rear of the battery module 1 and cooled by its first bent vent path can pass through the vent hole 211 with a small cross-sectional area, be throttled, and cooled again.

[0083] Figure 22 shows the venting and heat propagation prevention effects of another battery module in another embodiment of the present invention, and Figures 23 and 24 show the venting and heat propagation prevention effects of a battery pack according to another embodiment of the present invention, respectively. Referring to these drawings, in the battery pack (P) according to another embodiment of the present invention, heat propagation between modules through the rear space 41 is prevented by the partition plate 23 of the rear cover 2. Furthermore, according to this embodiment, the gas discharged from the battery module 1 to the rear is cooled as it passes through a first-order curved path, and can be throttled and cooled again as it passes through the mesh-like vent holes 211. Furthermore, according to this embodiment, the dust discharged from the battery module 1 falls and accumulates below the opening of the rear cover 2, and is discharged upward, so it is not necessary to close the vent path including the vent device.

[0084] The embodiments described above should be understood to be illustrative and not limiting in all respects, and the scope of the present invention is indicated more by the claims described below than by the detailed description above. Furthermore, the meaning and scope of the claims described below, as well as any modified and transformable forms conceived from their equivalent concepts, should all be interpreted as being included within the scope of the present invention.

[0085] As described above, the present invention has been explained with reference to the illustrative drawings. However, the present invention is not limited to the embodiments and drawings disclosed herein, and it is obvious to an ordinary person skilled in the art that various modifications can be made within the scope of the technical concept of the present invention. Furthermore, even if the effects of the configuration of the present invention are not explicitly described and explained while embodiments of the present invention are described above, it is natural to acknowledge that predictable effects can be obtained from such configuration. [Explanation of Symbols]

[0086] 1 Battery Module 10 1st fastening hole 11 U-frame 12 End Plates 121 Injection part 122 Metal parts 13 Top Plate 14 battery cells 2 Rear cover 20 2nd fastening hole 21 Top plate 211 Vent holes 22 Rear plate 23 Partition plate 24 molten flame 241 Top plate (vent delay section) 242 Bottom plate 243 Side panel 30 Fastening members 4-pack frame 41 Rear space P Battery Pack V Automobile

Claims

1. In a battery pack including multiple battery modules arranged side by side along the width direction, At least one battery module includes an end plate forming at least a portion of its rear surface, and a rear cover made of a heat-resistant material having an open front shape and positioned behind the end plate. Includes, The aforementioned rear cover is A pair of partition plates extending rearward from both sides in the width direction of the rear end of the battery module, An upward-facing vent hole, including, Battery pack.

2. The rear cover is fastened to the first fastening hole provided in the battery module. The battery pack according to claim 1.

3. The rear cover includes an upper plate that connects the upper ends of the pair of partition plates to each other and covers the upper part of the rear cover. The upper plate is provided with the vent hole and the second fastening hole facing upward. The first fastening hole is provided at the rear end of the battery module so as to face upward, The rear cover covers a portion of the upper surface of the battery module and is fastened to the battery module by fastening members that simultaneously pass through the first fastening hole and the second fastening hole. The battery pack according to claim 2.

4. The partition plate covers a portion of both sides in the width direction of the battery module. The battery pack according to claim 3.

5. The rear cover includes a rear plate that connects the rear ends of the pair of partition plates to each other and covers the rear of the rear cover. The battery pack according to claim 1.

6. The aforementioned rear cover has an open shape at its lower end. The battery pack according to claim 1.

7. The aforementioned rear cover includes a molten frame, The molten frame includes a vent delay portion that covers the vent hole. The battery pack according to claim 1.

8. The vent delay portion is formed to be thinner than other parts of the molten frame. The battery pack according to claim 7.

9. The molten frame has a box shape that is substantially open at both the front and rear ends. The upper and lower plates of the molten frame are formed to be thinner than the side plates. The battery pack according to claim 7.

10. The molten flame has a predetermined melting point that is lower than the melting point of the rear cover. The battery pack according to claim 7.

11. The aforementioned rear cover includes mica material, The battery pack according to claim 1.

12. The molten frame includes a polycarbonate material. The battery pack according to claim 7.

13. The aforementioned vent holes are covered with mesh. The battery pack according to claim 1.

14. The vent holes are formed in a mesh-like manner. The battery pack according to claim 1.

15. The vent hole is formed in the shape of a slit. The battery pack according to claim 1.

16. A battery pack according to any one of claims 1 to 15 is incorporated. car.

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