Battery pack

Abstract

To provide a battery pack capable of suppressing possibility that debris blocks a smoke exhaust path.SOLUTION: A battery pack 100 according to the present disclosure is mounted on a vehicle VE, and includes: a plurality of battery cells 1 stacked in a front-rear direction of the vehicle VE in a state where the battery pack 100 is mounted on a lower side of a vehicle room VR of the vehicle VE; a case 2 accommodating the plurality of battery cells 1; and a share panel 3 disposed below the case 2. The battery cell 1 includes a cell opening 1b and a cell valve 1a. The cell opening 1b is provided on a bottom surface 1aa of the battery cell 1. The cell valve 1a is provided on the cell opening 1b. The case 2 includes a case opening 2a communicating with the cell opening 1b. The case opening 2a is provided on a bottom 22a of the case 2. A smoke exhaust route RR is formed between the case 2 and the share panel 3. The share panel 3 protrudes toward a side of the cell valve 1a.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a battery pack. [Background technology]

[0002] In the battery module disclosed in Patent Document 1, multiple battery cells are stacked. A casing houses the multiple battery cells arranged horizontally. A smoke exhaust cover is positioned between the multiple battery cells and the top plate of the casing. A pressure release valve is provided on the top surface of each of the multiple battery cells. For example, a short circuit may occur inside a battery cell, generating high-pressure gas or debris that may be released through the pressure release valve. Hereinafter, the phenomenon of gas or debris being released from the pressure release valve of a battery cell may be simply referred to as "smoke generation." The smoke exhaust cover can effectively guide the gas and debris that are ejected from the battery cell when smoke is generated. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-065217 Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors of the present application have discovered the following problems. The inventors of the present application conceived of a battery pack in which a cell valve is provided on the bottom surface of each of a plurality of battery cells. The case has a case opening facing the cell valve. A shear panel is disposed below the case. A smoke exhaust path is formed between the shear panel and the case. In such a battery pack, when smoke is generated, gas and debris are ejected from the cell valve of the battery cell, pass through the case opening, and are guided by the shear panel and the case. In other words, the debris is discharged through the smoke exhaust path. However, there is a risk that debris will accumulate on the shear panel below the cell valve, blocking the smoke exhaust path.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and provides a battery pack that can reduce the risk of debris blocking the smoke exhaust path. [Means for solving the problem]

[0006] The battery pack according to the present disclosure comprises: A battery pack to be mounted on a vehicle, With the battery pack mounted under the passenger compartment of the vehicle, a plurality of battery cells stacked in the front-rear direction of the vehicle; a case that houses the plurality of battery cells; a shear panel disposed below the case; Equipped with The battery cell includes a cell opening and a cell valve, the cell opening is provided on a bottom surface of the battery cell, the cell valve is provided at the cell opening, the case has a case opening communicating with the cell opening, the case opening is provided on the bottom surface of the case, A smoke exhaust path is formed between the case and the shear panel, The shear panel protrudes toward the cell valve.

[0007] In the battery pack described above, the share panel may include a share panel body and a protrusion provided below the cell valve, the protrusion protruding toward the cell valve.

[0008] In the battery pack described above, the convex portion may be a cylindrical body having a triangular cross-sectional shape, and the angle formed by the intersection of two outer surfaces of the cylindrical body may protrude toward the cell valve.

[0009] In the battery pack described above, the protrusion may be a cylindrical body having a trapezoidal cross section, and the cylindrical body may protrude toward the cell valve. [Effects of the Invention]

[0010] According to the present disclosure, it is possible to reduce the risk of debris blocking the smoke exhaust path. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a top view of a configuration example of a battery pack according to a first embodiment. [Figure 2] 1 is a cross-sectional view of a configuration example of a battery pack according to a first embodiment. [Figure 3] 1 is a cross-sectional view of a configuration example of a battery module according to Embodiment 1. FIG. [Figure 4] 1 is an enlarged cross-sectional view of a configuration example of a battery module according to Embodiment 1. FIG. [Figure 5] FIG. 4 is an enlarged cross-sectional view of a modified example of the battery module according to the first embodiment. [Figure 6] FIG. 10 is an enlarged cross-sectional view of another modified example of the battery module according to the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. In addition, the following description and drawings have been simplified as appropriate for clarity of explanation.

[0013] <First Embodiment> A first embodiment will be described with reference to Figs. 1 to 4. Fig. 1 is a top view of an example of the configuration of a battery pack according to the first embodiment. Fig. 2 is a cross-sectional view of the example of the configuration of the battery pack shown in Fig. 1. Fig. 3 is a cross-sectional view of an example of the configuration of a battery module according to the first embodiment. Fig. 4 is an enlarged cross-sectional view of the example of the configuration of the battery module shown in Fig. 3.

[0014] It should be noted that the right-handed XYZ coordinate system shown in Figure 1 and other drawings is a matter of convenience for explaining the positional relationships of the components. Normally, the positive direction of the UPR axis is vertically upward in the vehicle VE, the positive direction of the FR axis is forward in the vehicle VE, and the positive direction of the RH axis is to the right in the vehicle VE. The plane containing the FR axis and the RH axis is a horizontal plane, which is common to all drawings.

[0015] 1 and 2, the battery pack 100 includes a battery module 10, a case 2, and a share panel 3. The battery pack 100 is mounted on a vehicle VE. The battery pack 100 is disposed below the vehicle interior VR of the vehicle VE.

[0016] The case 2 houses the battery module 10. The battery module 10 extends in the FR axis direction. The case 2 includes a lower case 22 and an upper case 21. The shear panel 3 is disposed below the case 2. The shear panel 3 can receive input from the road surface while the vehicle VE is traveling. The shear panel 3 is disposed at a predetermined distance from the case 2. The shear panel 3 is preferably sized to cover the case 2. The case 2 and the shear panel 3 are preferably made of a metal material. Such a metal material is, for example, steel or an aluminum alloy.

[0017] A smoke exhaust route RR is formed between the shared panel 3 and the case 2. When smoke is generated, the gas is expelled from the battery module 10 and preferably passes through the smoke exhaust route RR and is discharged to the outside of the vehicle VE.

[0018] A cell space SP2 is formed between the lower case 22 and the upper case 21. The battery module 10 is housed in the cell space SP2.

[0019] An equipment space SP3 may be formed inside the upper case 21. Equipment constituting the vehicle VE may be arranged in the equipment space SP3.

[0020] The battery module 10 includes a plurality of battery cells 1 and two end plates 4. The plurality of battery cells 1 may be stacked in the FR axis direction with a heat insulating material or the like interposed therebetween. The two end plates 4 may sandwich the plurality of battery cells 1 with a heat insulating material or the like interposed therebetween. As shown in FIG. 3, the battery modules 10 are arranged in parallel in the case 2. In the example shown in FIG. 3, four battery modules 10 are arranged in parallel in the RH axis direction in the case 2.

[0021] 3 and 4, the cooler 5 may be provided on the bottom surface 22a of the lower case 22. The cooler 5 may be in contact with the bottom surface 22a of the lower case 22 via a thermally conductive adhesive. The cooler 5 may be made of a material with good thermal conductivity. Such a material may be, for example, aluminum, copper, or an alloy thereof.

[0022] As shown in FIG. 4, the battery cell 1 has a cell opening 1b and a cell valve 1a. The cell opening 1b is provided on the bottom surface 1aa of the battery cell 1. The cell valve 1a is provided on the cell opening 1b. An example of the cell valve 1a shown in FIG. 4 is provided near the center of the bottom surface 1aa of the battery cell 1. A positive electrode terminal and a negative electrode terminal may be provided on both side surfaces of the battery cell 1. The case 2 has a case opening 2a that communicates with the cell opening 1b. The case opening 2a is provided on the bottom surface 22a of the lower case 22. A case valve may be provided on the case opening 2a. A cooler 5 may be provided around the case opening 2a.

[0023] The shear panel 3 protrudes toward the cell valve 1a. Specifically, the shear panel 3 includes a shear panel main body 3a and a protruding portion 3b. The shear panel main body 3a faces the bottom surface 22a of the lower case 22. The protruding portion 3b is provided below the cell valve 1a (here, in the negative direction of the UPR axis). The shear panel main body 3a and the protruding portion 3b are continuous. The protruding portion 3b protrudes toward the cell valve 1a (here, in the positive direction of the UPR axis). The protective member 6 may cover and protect the protruding portion 3b. By protecting the protruding portion 3b with the protective member 6, the occurrence of melting damage may be suppressed. The heat resistance of the protective member 6 is preferably higher than that of the shear panel 3. The protective member 6 is preferably made of a heat-resistant material, such as mica.

[0024] At this point, the battery cell 1 emits smoke, generating gas FF and high-pressure debris inside the battery cell 1, and the debris reaches the cell valve 1a. This causes the cell valve 1a to open. The debris passes through the case opening 2a and reaches the shear panel 3. As described above, the shear panel 3 protrudes toward the cell valve 1a. This causes the shear panel 3 to branch the debris to both sides in the longitudinal direction (RH axis direction) of the battery cell 1. This allows the debris to be dispersed on the shear panel 3.

[0025] Furthermore, the share panel 3 according to this embodiment comprises a share panel body 3a and a protrusion 3b provided below the cell valve 1a. The protrusion 3b protrudes toward the cell valve 1a. With this configuration, the protrusion 3b branches the gas FF and debris to both sides of the battery cell 1 in the longitudinal direction (RH axis direction). This prevents heat from being transferred from the exhaust gas to the share panel 3, while dispersing the debris.

[0026] <Modified Share Panel> Next, each of the modified examples of the share panel 3 will be described.

[0027] The shear panel 13 shown in FIG. 5 is a modified version of the shear panel 3 shown in FIG. 4. FIG. 5 is an enlarged cross-sectional view of a modified version of the battery module according to Embodiment 1. The shear panel 13 includes a shear panel main body 13a and a protruding portion 13b. The shear panel main body 13a faces the bottom surface 22a of the lower case 22. The protruding portion 13b is provided below the cell valve 1a (in the negative direction of the UPR axis). The protruding portion 13b is disposed on the shear panel main body 13a. The protruding portion 13b is a cylindrical body with a triangular cross section. The cylindrical body preferably extends in the FR axis direction. The cylindrical body has outer surfaces 13ba and 13bb. The outer surfaces 13ba and 13bb intersect to form an angle 13bc. The angle 13bc protrudes toward the cell valve 1a (in the positive direction of the UPR axis). With this configuration, the corners 13bc cause the gas FF and debris to branch to both sides in the longitudinal direction (RH axis direction) of the battery cell 1. In addition, because the protrusions 13b are cylindrical, they suppress heat conduction between the gas FF and debris and the shear panel main body 13a. This makes it possible to further disperse debris while improving the heat insulation effect.

[0028] Moreover, the shear panel 23 shown in FIG. 6 is another modified example of the shear panel 3 shown in FIG. 4. FIG. 6 is an enlarged cross-sectional view of another modified example of the battery module according to Embodiment 1. The shear panel 23 includes a shear panel main body 13a and a protruding portion 23b. The protruding portion 23b is provided below the cell valve 1a (in the negative direction of the UPR axis). The protruding portion 23b is disposed on the shear panel main body 13a. The protruding portion 23b is a cylindrical body with a trapezoidal cross section. The cylindrical body preferably extends in the FR axis direction. The trapezoid has a first base 23ba located on the cell valve 1a side and a second base 23bb located on the shear panel main body 13a side. The first base 23ba is located on the cell valve 1a side, and the second base 23bb is located on the shear panel main body 13a side. The first base 23ba is preferably shorter than the second base 23bb. With this configuration, the protrusions 23b branch the gas FF and debris to both sides in the longitudinal direction (RH axis direction) of the battery cell 1. In addition, because the protrusions 23b are cylindrical, they suppress heat conduction between the gas FF and debris and the shear panel main body 13a. This makes it possible to further disperse the debris while improving the heat insulation effect.

[0029] The present invention is not limited to the above-described embodiment, and can be appropriately modified without departing from the spirit and scope of the present invention. Furthermore, the present invention may be implemented by appropriately combining the above-described embodiment and examples thereof. [Explanation of symbols]

[0030] 100 battery packs 10 Battery Module 1 battery cell 1a Cell valve 1aa bottom 1b Cell opening 2 cases 2a Case opening 21 Upper case 22 Lower case 22a Bottom 3, 13, 23 Share Panel 3a, 13a Share panel body 3b, 13b, 23b Convex part 13ba, 13bb outer surface 13bc corner 4 End Plates 5 Cooler 6 Protective materials FF Gas RR Smoke exhaust route SP2 Cell Space SP3 equipment space VE vehicle VR cabin

Claims

1. A battery pack to be mounted on a vehicle, With the battery pack mounted under the passenger compartment of the vehicle, a plurality of battery cells stacked in the front-rear direction of the vehicle; a case that houses the plurality of battery cells; a shear panel disposed below the case; Equipped with The battery cell includes a cell opening and a cell valve, the cell opening is provided on a bottom surface of the battery cell, the cell valve is provided at the cell opening, the case has a case opening communicating with the cell opening, the case opening is provided on the bottom surface of the case, A smoke exhaust path is formed between the case and the shear panel, The shear panel protrudes toward the cell valve. Battery pack.

2. The shear panel includes a shear panel body and a protrusion provided below the cell valve, The protrusion protrudes toward the cell valve. The battery pack according to claim 1 .

3. the protrusion is a cylindrical body having a triangular cross-sectional shape, The angle formed by the intersection of the two outer surfaces of the cylindrical body protrudes toward the cell valve. The battery pack according to claim 2 .

4. the protrusion is a cylindrical body having a trapezoidal cross section, The cylindrical body protrudes toward the cell valve. The battery pack according to claim 2 .

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