Battery pack with reduced temperature deviation

Abstract

A battery pack having a reduced temperature deviation according to an embodiment of the present invention comprises: a plurality of cell module assemblies; and a housing accommodating the plurality of unit module assemblies therein, the housing including: an air supply port through which cooling air is introduced into the housing; a discharge port through which the cooling air is discharged from the housing; the electronic device includes a housing, a first side surface portion disposed on one side surface of the housing, in which the first side surface portion includes a plurality of first beads protruding from the first side surface portion toward an interior of the housing.

Description

Technical Field

[0001] The present disclosure relates to a battery pack, and more particularly, to a battery pack capable of improving temperature deviation between cell module assemblies inside the battery pack. Background Art

[0002] Unlike primary batteries that cannot be recharged, secondary batteries refer to batteries that can be charged and discharged, and are applied not only to portable devices but also to electric vehicles (EVs) and hybrid electric vehicles (HEVs) driven by an electric drive source.

[0003] The types of secondary batteries widely used at present include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries and nickel-zinc batteries. The operating voltage of such a unit secondary battery cell, i.e., a unit battery cell, is about 2.5V to 4.6V. Therefore, when a higher output voltage is required, a battery pack is formed by connecting a plurality of battery cells in series. In addition, a battery pack can be formed by connecting a plurality of battery cells in parallel according to the charge / discharge capacity required for the battery pack. Therefore, the number of battery cells included in the battery pack can be set in various ways according to the required output voltage or charge / discharge capacity.

[0004] When a battery pack is formed by connecting a plurality of battery cells in series / parallel, a battery module including at least one battery cell, preferably a plurality of battery cells, is generally first constructed, and a battery pack is formed by using at least one such battery module and adding other components. In this case, a battery module refers to a component in which a plurality of battery cells are connected in series or in parallel, and a battery pack refers to a component in which a plurality of battery modules are connected in series or in parallel to increase capacity, output, etc.

[0005] Typically, a battery pack has a plurality of battery modules or battery module assemblies arranged on the same plane to maintain structural stability.

[0006] In such a battery pack, heat is generated during charging and discharging, and the generated heat needs to be removed by an appropriate cooling method.

[0007] For example, there is a cooling method of introducing cooling air into the battery pack.

[0008] However, there is a problem of temperature deviation between the cell module assemblies (CMA) inside the battery pack, and the temperature of the battery pack and the control of temperature deviation are closely related to battery life and performance. The smaller the temperature deviation, the better product quality and battery life can be expected. Summary of the invention

[0009] [Technical issues]

[0010] The present disclosure provides a battery pack having improved temperature deviation between cell module assemblies.

[0011] [Technical solution]

[0012] According to one embodiment of the present disclosure, a battery pack with improved temperature deviation includes: a plurality of single-cell module assemblies; and a shell that accommodates the plurality of single-cell module assemblies, wherein the shell includes: an air inlet through which cooling air flows into the shell; an air outlet through which the cooling air is discharged from the shell; and a first side portion that is disposed on one side of the shell, wherein the first side portion includes a plurality of first ridges that protrude inwardly from the first side portion into the shell.

[0013] Further, the shell also includes a second side portion, and the second side portion is disposed to face the first side portion.

[0014] Furthermore, the battery pack also includes: an inflow passage, which is disposed on the inner side of the first side portion of the shell, and the cooling air flowing in from the air inlet moves through the inflow passage; and an outflow passage, which is disposed on the inner side of the second side portion of the shell, and the cooling air moves through the outflow passage to be discharged through the air outlet.

[0015] Further, the shell further includes: a third side portion, the third side portion is disposed on the other side of the shell; and a fourth side portion, the fourth side portion is disposed to face the third side portion.

[0016] Further, the air inlet is disposed on the third side, and the air outlet is disposed on the fourth side.

[0017] Further, the plurality of single module assemblies are arranged along a direction from the third side portion to the fourth side portion.

[0018] Further, each of the plurality of first ribs is formed such that an entire thickness of the first side portion protrudes inwardly into the housing.

[0019] Further, each of the plurality of single module assemblies is placed in front of the first ridge.

[0020] Further, each of the plurality of first ribs is disposed on the first side portion to face the space between the plurality of single module assemblies.

[0021] Further, the plurality of first ridges are arranged to correspond in sequence to the plurality of single module assemblies adjacent to the third side portion.

[0022] Further, the plurality of first ridges are disposed within 1 / 2 of the length of the first side portion from one end of the first side portion connected to the third side portion.

[0023] Further, the number of the plurality of first ridges is equal to or less than 1 / 2 of the number of the plurality of single module assemblies.

[0024] Further, each of the plurality of first ridges has a trapezoidal shape in a plan view.

[0025] Further, each of the plurality of first ridges has a triangular shape in a plan view.

[0026] Further, heights of the plurality of first ridges protruding from the first side portion gradually increase along a moving direction of the cooling air flowing in from the air inlet.

[0027] Further, a protrusion height of a first first ridge among the plurality of first ridges that is first positioned from the air inlet from the first side portion is 15% to 25% of a gap between the first side portion and one end of the plurality of monomer module assemblies, a protrusion height of a second first ridge among the plurality of first ridges that is second positioned from the air inlet is 35% to 45% of the gap between the first side portion and the one end of the plurality of monomer module assemblies, and a protrusion height of a third first ridge among the plurality of first ridges that is third positioned from the air inlet is 55% to 65% of the gap between the first side portion and the one end of the plurality of monomer module assemblies.

[0028] Further, vertical heights of the plurality of first ridges on the first side portion gradually increase along a moving direction of the cooling air flowing in from the air inlet.

[0029] Further, the second side portion includes a plurality of second ridges, and the plurality of second ridges protrude inwardly from the second side portion into the housing.

[0030] Further, the shell also includes: a third side portion, which is disposed on the other side of the shell; and a fourth side portion, which is disposed to face the third side portion, wherein the plurality of second ridges are arranged to correspond in sequence to the plurality of single module assemblies adjacent to the fourth side portion.

[0031] Further, the heights of the plurality of second ridges protruding from the second side portion gradually decrease from the air outlet in a direction opposite to a moving direction of the cooling air.

[0032] Further, the plurality of second ribs are disposed within 1 / 2 of the length of the second side portion from one end of the second side portion connected to the fourth side portion.

[0033] Further, the number of the plurality of second ribs is equal to or less than 1 / 2 of the number of the plurality of single module assemblies.

[0034] [Effects of the Invention]

[0035] The battery pack according to the present disclosure has an improved temperature deviation between cell module assemblies inside the battery pack, thereby improving battery performance and increasing battery life.

[0036] Furthermore, the battery pack according to the present disclosure has improved temperature deviation and enhanced case rigidity, which results in reduced thickness due to increased rigidity and reduced cost.

[0037] Description of the drawings

[0038] Figure 1 is a perspective view of a battery pack according to a first embodiment of the present disclosure.

[0039] Figure 2 is an exploded perspective view of a battery pack according to a first embodiment of the present disclosure.

[0040] Figure 3 is a rear perspective view of the battery pack according to the first embodiment of the present disclosure.

[0041] Figure 4 is a rear view of the battery pack according to the first embodiment of the present disclosure.

[0042] Figure 5 is an internal plan view of a battery pack according to a first embodiment of the present disclosure.

[0043] Figure 6 yes Figure 5 A detailed view of a part.

[0044] Figure 7 is a rear view of a battery pack according to a second embodiment of the present disclosure.

[0045] Figure 8 is an internal plan view of a battery pack according to a third embodiment of the present disclosure.

[0046] Fig. 9 is an internal plan view of a battery pack according to a fourth embodiment of the present disclosure.

[0047] Fig.10 yes Fig. 9 A detailed view of a part.

[0048] Fig.11 yes Fig. 9Rear view of.

[0049] Fig.12 is a diagram showing the result of a temperature distribution simulation of a battery pack according to a fourth embodiment of the present disclosure.

[0050] Fig.13 is a partial detailed view of a battery pack according to a fifth embodiment of the present disclosure.

[0051] Fig.14 are diagrams showing various test examples of the present disclosure and comparative examples.

[0052] Fig.15 It is shown Fig.14 Graph of the temperature distribution of the test sample shown in .

[0053] Fig.16 It is shown Fig.14 Graph of the flow rate of each cell module assembly in the test example shown in . DETAILED DESCRIPTION

[0054] By referring to the embodiments described in detail below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the methods for realizing them will become apparent. However, the present disclosure is not limited to the embodiments disclosed below and will be implemented in various different forms. The present embodiment is provided only to make the disclosure of the present disclosure complete and to fully inform the scope of the present disclosure to those of ordinary skill in the art to which the present disclosure belongs, and the present disclosure is limited only by the scope of the claims. Therefore, in some embodiments, well-known process steps, well-known equipment structures, and well-known technologies are not specifically described to avoid ambiguous interpretations of the present disclosure. Throughout the specification, the same reference numerals represent the same components.

[0055] In the accompanying drawings, in order to clearly represent multiple layers and regions, their thicknesses may be shown in proportion. Throughout the specification, the same parts are given the same reference numerals. When describing that a part such as a layer, a film, a region, a plate, etc. is "on" another part, this includes not only the situation where the part is "directly on" the other part, but also the situation where there are other parts between them. On the contrary, when describing that a part is "directly on" another part, this means that there are no other parts between them. In addition, when describing that a part such as a layer, a film, a region, a plate, etc. is "below" another part, this includes not only the situation where the part is "directly below" the other part, but also the situation where there are other parts between them. On the contrary, when describing that a part is "directly below" another part, this means that there are no other parts between them.

[0056] Hereinafter, a battery pack with improved temperature deviation according to preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0057] Figure 1 is a perspective view of a battery pack according to a first embodiment of the present disclosure, Figure 2 is an exploded perspective view of a battery pack according to a first embodiment of the present disclosure, Figure 3 is a rear perspective view of a battery pack according to a first embodiment of the present disclosure, Figure 4 is a rear view of a battery pack according to a first embodiment of the present disclosure, Figure 5 is an internal plan view of a battery pack according to a first embodiment of the present disclosure, and Figure 6 yes Figure 5 A detailed view of a part.

[0058] A battery pack 1000 with improved temperature deviation according to the present disclosure includes a plurality of cell module assemblies (CMAs) 100 and a case 200 for accommodating the plurality of cell module assemblies 100 .

[0059] The cell module assemblies 100 accommodated in the battery pack 1000 include a plurality of battery cells (not shown), and the plurality of battery cells in each cell module assembly 100 may be arranged in close contact.

[0060] Each battery cell may be, for example, a pouch-type battery cell.

[0061] As an example, the cell module assembly 100 may include a plurality of battery cells stacked on top of each other or in close contact with each other, and each battery cell may be provided with an electrode lead at the front end and / or the rear end, with a positive electrode lead at the front end and a negative electrode lead at the rear end. In the cell module assembly 100, the plurality of battery cells may be arranged to be electrically connected to each other.

[0062] In the cell module assembly 100 , the battery cell is not limited to the pouch-type battery cell, and may be made of other types of battery cells such as a prismatic battery cell.

[0063] The cell module assembly 100 may be placed in the housing 200 of the battery pack 1000 in an open form without a separate housing. In addition, as another example, the cell module assembly 100 may be in the form of a plurality of battery cells stored in a housing, and the cell module assembly 100 may be placed independently in the housing 200 of the battery pack 1000, wherein the cells are in individual housings.

[0064] The housing 200 is used to accommodate the plurality of cell module assemblies 100 , and may include a lower portion 260 , an upper portion 250 , a first side portion 220 , a second side portion 210 , a third side portion 230 , and a fourth side portion 240 .

[0065] The lower portion 260 of the housing 200 may be a horizontally extending plate forming the bottom of the housing 200 , and the plurality of cell module assemblies 100 may be placed above the lower portion 260 .

[0066] As shown in the figure, the plurality of single module assemblies 100 can be arranged at a third side 230 (located at Figure 5 The left side of the housing 200) to the fourth side portion 240 (located at Figure 5 The plurality of housings 200 and 200 are arranged at regular intervals in a direction of the right side of the housing 200.

[0067] In the housing 200 , the third side portion 230 and the fourth side portion 240 may respectively form the left and right sides of the housing 200 in this embodiment, and the third side portion 230 and the fourth side portion 240 may respectively be disposed on the left and right edges of the lower portion 260 .

[0068] like Figures 3 to 6 As shown, the third side portion 230 of the housing 200 may be formed in the shape of a square plate, and the air inlet 201 may be provided on the third side portion 230. The air inlet 201 is a position where cooling air for cooling the coolant of the cell module assembly 100 placed in the battery pack 1000 flows in, and the cooling air introduced through the air inlet 201 may be discharged through the air outlet 202 provided on the opposite fourth side portion 240 after cooling the cell module assembly 100.

[0069] In the present embodiment, the air inlet 201 is disposed at the rear of the third side portion 230 to which the first side portion 220 is connected, and cooling air introduced through the air inlet 201 may flow through an inflow passage 205 between the rear plate 120 and the first side portion 220 to be described later.

[0070] The fourth side portion 240 of the housing 200 may be formed in a square plate shape and may be arranged in parallel to the third side portion 230. In addition, the length of the fourth side portion 240 may be the same as that of the third side portion 230, and the air outlet 202 may be provided in the fourth side portion 240. The air outlet 202 is a location where cooling air for cooling the coolant of the cell module assembly 100 is discharged from the battery pack 1000. In the present embodiment, the air outlet 202 may be provided at the front of the fourth side portion 240 to which the second side portion 210 is connected. The air outlet 202 may be placed diagonally to the air inlet 201 placed in the third side portion 230, as shown in the figure.

[0071] Therefore, cooling air that cools the cell module assembly 100 may flow through the outflow passage 206 between the front plate 110 (to be described later) and the second side portion 210 to be discharged through the air outlet 202 .

[0072] In this embodiment, a fan (not shown) may be disposed in the air outlet 202 . Therefore, the cooling air introduced through the air inlet 201 may be discharged through the air outlet 202 by the fan disposed in the air outlet 202 .

[0073] Furthermore, as another embodiment, a fan may flow cooling air into the housing 200 , and in this case, the air outlet 202 may serve as an air inlet, and the air inlet 201 may serve as an air outlet.

[0074] Furthermore, in another embodiment, a fan may be placed in the air inlet 201 instead of the air outlet 202. In this case, the fan may allow cooling air from the outside to be sucked into the battery pack, and the fan may allow cooling air inside the battery pack to be discharged to the outside.

[0075] In the housing 200, in this embodiment, the first side portion 220 and the second side portion 210 may form the rear surface and the front surface of the housing 200, respectively (see Figure 5 ). The first side portion 220 and the second side portion 210 may be disposed at the rear edge and the front edge of the lower portion 260, respectively. The second side portion 210 may be arranged parallel to the first side portion 220 to face each other, and the length of the second side portion 210 may be the same as the length of the first side portion 220.

[0076] Furthermore, as shown, inside the housing 200 , the front plate 110 may be disposed to be spaced inwardly from and parallel to the second side 210 , and the rear plate 120 may be disposed to be spaced inwardly from and parallel to the first side 220 .

[0077] Each of the cell module assemblies 100 may be placed between the front plate 110 and the rear plate 120 , wherein one end of each of the cell module assemblies 100 may be placed on the rear plate 120 , and the other end of each of the cell module assemblies 100 may be placed on the front plate 110 .

[0078] In addition, the front plate 110 may have a plurality of openings 111 so that the other end of each single module assembly 100 is connected to the space between the front plate 110 and the second side portion 210, and the rear plate 120 may have a plurality of openings so that one end of each single module assembly 100 is connected to the space between the rear plate 120 and the first side portion 220.

[0079] In addition, between the first side portion 220 and the rear plate 120 (one end of the single module assembly 100), an inflow passage 205 through which the cooling air flowing in from the air inlet 201 moves may be formed, and between the second side portion 210 and the front plate 110 (the other end of the single module assembly 100), an outflow passage 206 may be formed.

[0080] Therefore, the cooling air can reach each battery cell module through the opening of the rear plate 120 while moving through the inflow passage 205 between the first side portion 220 and the rear plate 120 (one end of the cell module assembly 100), and then move through the opening 111 of the front plate 110 to reach the outflow passage 206 between the second side portion 210 and the front plate 110 (the other end of the cell module assembly 100) to be discharged through the air outlet 202.

[0081] In each cell module assembly 100 , electrode leads (anode / cathode leads) of the battery cells may be electrically connected to the front plate 110 and the rear plate 120 , respectively.

[0082] As such, the first side portion 220 , the second side portion 210 , the third side portion 230 , and the fourth side portion 240 of the case 200 may form a side surface of the case 200 .

[0083] The upper portion 250 is placed on the top of the housing 200, and the upper portion 250 is placed above the battery cell assembly 100 in the form of a plate extending in a horizontal direction, and the first side portion 220, the second side portion 210, the third side portion 230, and the fourth side portion 240 are connected at the edge of the upper portion 250. In the present embodiment, the upper portion 250 may be integrally formed with the first side portion 220 and the second side portion 210.

[0084] In the present embodiment, the housing 200 is shown in the form of a square frame as shown, but may be configured in various shapes including a polygonal shape without being limited to the above-mentioned form.

[0085] Furthermore, in the present disclosure, a plurality of beads 300 and 350 may be disposed on the inner side of the first side portion 220 and / or the second side portion 210 of the housing 200 .

[0086] Figure 5 1 is an internal plan view of a battery pack 1000 according to a first embodiment of the present disclosure. In the first embodiment of the present disclosure, six single module assemblies 100 are placed, and three first ribs 300 may be placed on the inner side of the first side portion 220 of the housing 200. In addition, the first rib 300 may be placed within 1 / 2 of the length L of the first side portion 220 from one end of the first side portion 220 connected to the third side portion 230 (to the other end of the first side portion 220 connected to the fourth side portion 240), and the number of the first ribs 300 may be 1 / 2 or less than 1 / 2 of the number of single module assemblies 100.

[0087] The first ribs 300 are intended to improve the temperature deviation between the cell module assemblies 100 inside the battery pack. In the first embodiment, the first ribs 300 are formed to protrude from the first side portion 220 toward the cell module assembly 100, and three first ribs 300 can be placed from one end of the first side portion 220 adjacent to the air inlet 201 along the moving direction of the cooling air.

[0088] Therefore, in the first embodiment, the first ribs 300 may be placed on the first side portion 220 to respectively correspond to the three unit module assemblies 100 adjacent to the air inlet 201 (or the third side portion 230). As shown, each first rib 300 may be placed at a position corresponding to the center of one end of each unit module assembly 100.

[0089] The first rib 300 may be formed by extruding the first side portion 220 during the manufacturing process so that the entire thickness of the first side portion 220 protrudes inside the housing 200, and as shown in FIG. Figure 5 and Figure 6 As shown, the first rib 300 may have a trapezoidal shape in a plan view.

[0090] Specifically, the first rib 300 may include two inclined surface portions 300 a bent at the first side portion 220 and a protruding end portion 300 b connecting the two inclined surface portions 300 a .

[0091] In addition, of the two parallel sides of the trapezoidal first rib 300 in the plan view, the long side may be located on the same plane as the first side portion 220, and the short side may correspond to the protruding end portion 300b of the first rib 300. The inclination angle α of the inclined surface portion 300a in the first rib 300 relative to the first side portion 220 may form an obtuse angle, and may specifically be in the range of 130 to 140 degrees or about 135 degrees. That is, the inclined surface portion 300a may be in the range of 40 to 50 degrees or about 45 degrees relative to the long side of the trapezoid.

[0092] The protruding end portion 300 b may be a plane connecting ends of the two inclined surface portions 300 a , and may be formed parallel to the first side portion 220 .

[0093] In the present disclosure, the cross-section of the first rib 300 is formed in a trapezoidal shape so that the cooling air introduced through the air inlet 201 moves linearly and then moves along the inclined surface portion 300 a to be guided to each cell module assembly 100 .

[0094] The height D of the first rib 300 protruding from the first side portion 220 may be within about 25% to 35% or about 55% to 65% of the gap between the first side portion 220 and the rear plate 120. For example, the protrusion height of the first rib 300 may be about 7.5 mm or about 15 mm. In the first embodiment, three identical first ribs 300 may be disposed, and the protrusion heights D of the first ribs 300 may be the same.

[0095] Furthermore, a vertical height H between the top and bottom of the first rib 300 on the first side portion 220 may be 50% to 100%, 60% to 90%, or 70% to 80% of the height of the first side portion 220 .

[0096] As described above, in the battery pack 1000, cooling air moves through the inflow passage 205 between the rear plate 120 and the first side portion 220, reaches each cell module assembly 100 through the opening of the rear plate 120, and then moves to the outflow passage 206 between the front plate 110 and the second side portion 210 through the opening 111 of the front plate 110 to be discharged through the air outlet 202. In this case, a small flow rate of cooling air flows into the cell module assembly 100 disposed adjacent to the air inlet 201, resulting in reduced cooling efficiency.

[0097] In the present disclosure, by placing the first rib 300 on the first side portion 220, the rigidity of the battery pack can be enhanced, and the thickness of the shell can be reduced due to the enhanced rigidity, thereby achieving a cost reduction effect. In addition, in the present disclosure, cooling air is smoothly introduced into the single module assembly 100 adjacent to the air inlet 201, thereby reducing the temperature deviation between the single module assemblies 100, thereby improving the quality of the battery pack and the battery life.

[0098] Next, a battery pack 1000 with improved temperature deviation according to a second embodiment of the present disclosure will be described.

[0099] Figure 7 is a rear view of a battery pack 1000 according to the second embodiment of the present disclosure.

[0100] The battery pack 1000 according to the second embodiment of the present disclosure is different from the battery pack according to the first embodiment in that the vertical height H between the top and the bottom of the three first ridges 300 on the first side 220 is the same in the first embodiment, while in the second embodiment, the vertical heights H of the three first ridges 300 are different from each other.

[0101] In this embodiment, the vertical height H of the first convex ridge 300 on the first side portion 220 may be set to gradually increase from one end of the first side portion 220 adjacent to the air inlet 201 along the moving direction of the cooling air.

[0102] Specifically, the first ridge 300 (located at Figure 7 Compared with the vertical height H of the first ridge 300 (the rightmost side), the vertical height H of the second first ridge 300 can be increased by 10% to 20%, and compared with the vertical height H of the first first ridge 300, the vertical height H of the third first ridge 300 farthest from the air inlet 201 can be increased by 20% to 30%.

[0103] In the second embodiment, the vertical height H of the first rib 300 is set to gradually increase from the air inlet 201 along the moving direction of the cooling air, thereby preventing the cooling air from excessively flowing into the first single module assembly 100 corresponding to the first first rib 300, and effectively distributing the cooling air to reduce temperature deviation.

[0104] Next, a battery pack 1000 with improved temperature deviation according to a third embodiment of the present disclosure will be described.

[0105] Figure 8 is an internal plan view of a battery pack 1000 according to a third embodiment of the present disclosure.

[0106] The difference between the battery pack 1000 according to the third embodiment of the present disclosure and the battery pack according to the first embodiment is that in the first embodiment the first rib 300 is disposed only on the first side portion 220 , while in the third embodiment the rib is also disposed on the second side portion 210 .

[0107] In the third embodiment, six single module assemblies 100 are placed inside the housing 200, three first ribs 300 are placed on the inner side of the first side portion 220 of the housing 200, and three second ribs 350 identical to the first ribs 300 may be placed on the inner side of the second side portion 210. The size of the second ribs 350 may be the same as that of the first ribs 300.

[0108] In this embodiment, in the same manner as the first embodiment, the three first ridges 300 disposed on the first side portion 220 can be formed to protrude from the first side portion 220 toward the single module assembly 100, can be disposed from one end of the first side portion 220 adjacent to the air inlet 201 along the movement direction of the cooling air, and can be disposed to correspond to the three single module assemblies 100 adjacent to the air inlet 201, respectively.

[0109] In the present embodiment, similar to the first rib 300, three second ribs 350 disposed on the second side portion 210 are intended to improve the temperature deviation between the cell module assemblies 100, and the second ribs 350 have the same configuration as the first rib 300. The second ribs 350 may be formed to protrude from the second side portion 210 toward the cell module assembly 100, may be disposed in a direction opposite to the moving direction of the cooling air from one end adjacent to the air outlet 202 of the second side portion 210, and may be arranged to correspond to the three cell module assemblies 100 adjacent to the air outlet 202, respectively.

[0110] Similar to the first rib 300, the second rib 350 may be formed such that the entire thickness of the second side portion 210 protrudes inwardly into the housing 200, and may have a trapezoidal shape in a plan view. In addition, the long side of the two parallel sides of the trapezoidal second rib 350 may be located on the same plane as the second side portion 210, and the short side may be placed at the protruding end of the second rib 350.

[0111] In the present disclosure, the cross-section of the second rib 350 is formed in a trapezoidal shape so that the cooling air cooling the cell module assemblies 100 and moving along the outflow passage 206 can be guided to each cell module assembly 100 along the inclined sides of the trapezoid.

[0112] The height of the second rib 350 protruding from the second side portion 210 may be the same as the height of the first rib 300. For example, the second rib 350 may be within about 25% to 35%, or about 55% to 65% of the gap between the second side portion 210 and the other end (front plate 110) of the cell module assembly 100. For example, the protrusion height of the second rib 350 may be about 7.5 mm or about 15 mm. In this embodiment, the protrusion heights of the three second ribs 350 may be the same.

[0113] In addition, the second rib 350 can be placed within 1 / 2 of the length L of the second side portion 210 from one end of the second side portion 210 connected to the fourth side portion 240 (to the other end of the second side portion 210 connected to the third side portion 230), and the number of second ribs 350 can be 1 / 2 or less than 1 / 2 of the number of single module assemblies 100.

[0114] Therefore, in this embodiment, the first rib 300 can be disposed on the first side portion 220 adjacent to the air inlet 201, as many as the number of the single-unit module assemblies 100 corresponding to half of the total single-unit module assemblies 100, and the second rib 350 can be disposed on the second side portion 210 adjacent to the air outlet 202, as many as the number of the remaining half of the single-unit module assemblies 100.

[0115] In this embodiment, the cooling air moving through the inflow passage 205 between the rear plate 120 and the first side portion 220 can be smoothly guided to the single module assembly 100 adjacent to the air inlet 201 through the first ridge 300 of the first side portion 220. In addition, the cooling air moving through the outflow passage 206 between the front plate 110 and the second side portion 210 can be guided to the single module assembly 100 adjacent to the air outlet 202 through the second ridge 350 of the second side portion 210 before being discharged through the air outlet 202, thereby further reducing the temperature deviation between the single module assemblies 100.

[0116] The other configurations and effects are the same as those of the first embodiment, and detailed descriptions thereof are omitted here.

[0117] Next, a battery pack 1000 with improved temperature deviation according to a fourth embodiment of the present disclosure will be described.

[0118] Fig. 9 is an internal plan view of a battery pack according to a fourth embodiment of the present disclosure, Fig.10 yes Fig. 9 A detailed view of the local area, Fig.11 yes Fig. 9 The rear view of Fig.12 is a diagram showing simulation results of temperature distribution of a battery pack according to a fourth embodiment of the present disclosure.

[0119] The battery pack 1000 according to the fourth embodiment of the present disclosure is different from the battery pack of the first embodiment in that, in the first embodiment, three identical first ridges 300 are placed on the first side portion 220, while in the fourth embodiment, the first ridges 300 have different heights D protruding from the first side portion 220 (the distance between the first side portion 220 and the protruding end 300b of the first ridge 300).

[0120] In a fourth embodiment, the first ridge 300 can be placed on the first side portion 220 to respectively correspond to the three single module assemblies 100 adjacent to the air inlet 201, and the height D of the first ridge 300 protruding from the first side portion 220 can be set to gradually increase from one end of the first side portion 220 adjacent to the air inlet 201 along the moving direction of the cooling air.

[0121] Specifically, the height D of the first first rib 300 protruding from the first side portion 220 closest to the air inlet 201 may be within about 15% to 25% of the gap between the first side portion 220 and one end of the unit module assembly 100 (or the rear plate 120), the height D of the second first rib 300 protruding from the first side portion 220 may be within about 35% to 45% of the gap between the first side portion 220 and one end of the module assembly 100 (or the rear plate 120), and the height D of the third first rib 300 protruding from the first side portion 220 may be within about 55% to 65% of the gap between the first side portion 220 and one end of the unit module assembly 100 (or the rear plate 120). For example, with respect to the heights of the first ribs 300 protruding from the first side portion 220, the height of the first first rib 300 may be about 5 mm, the height of the second first rib 300 may be about 10 mm, and the height of the third first rib 300 may be about 15 mm. In addition, if Fig.11 As shown, the width of the first rib 300 in the left-right direction on the first side portion 220 may be formed to gradually increase along the moving direction of the cooling air.

[0122] In the fourth embodiment, the first ribs 300 are arranged so that the height D protruding from the first side portion 220 gradually increases, thereby preventing excessive inflow of cooling air into the first single module assembly 100 (corresponding to the first first rib 300), and the cooling air is effectively distributed, thereby reducing temperature deviation. The other configurations are the same as those of the first ribs 300 in the first embodiment.

[0123] at the same time, Fig.12 The result of temperature distribution simulation using CFD (Computational Fluid Dynamics) to simulate temperature deviation in the battery pack 1000 according to the fourth embodiment is shown.

[0124] In the present embodiment, the temperature distribution showed the minimum temperature deviation (2.5 / 3.37) per CP, as shown in Table 1 described later, and the temperature deviation was reduced by 70% / 42%, compared with a general battery pack without convex ribs.

[0125] Meanwhile, in the present embodiment, the first rib 300 is disposed only on the first side portion 220, but in another embodiment, the second rib 350 may also be disposed on the second side portion 210, and the second rib 350 disposed on the second side portion 210 may be disposed to correspond to each of the three single module assemblies 100 adjacent to the air outlet 202. In this case, the height of the second rib 350 protruding from the second side portion 210 may be set to gradually decrease from the air outlet 202 in the opposite direction of the moving direction of the cooling air. The height of the first second rib 350 protruding from the second side portion 210 closest to the air outlet 202 may be within about 60±5% of the gap between the second side portion 210 and the other end (front plate 110) of the monomer module assembly 100, the height of the second second rib 350 may be within about 40±5% of the gap between the second side portion 210 and the other end (front plate 110) of the monomer module assembly 100, and the height of the third second rib 350 may be within about 20±5% of the gap between the second side portion 210 and the other end (front plate 110) of the monomer module assembly 100.

[0126] Next, a battery pack 1000 with improved temperature deviation according to a fifth embodiment of the present disclosure will be described.

[0127] Fig.13 is a partial detailed view of a battery pack according to a fifth embodiment of the present disclosure.

[0128] The difference between the battery pack 1000 according to the fifth embodiment of the present disclosure and the battery packs of the previous embodiments is that the first rib 300 (or the second rib 350 ) has a different shape in a plan view.

[0129] That is, in the previous embodiment, the first rib 300 (or the second rib 350 ) is formed in a trapezoidal shape in a plan view, but in the present embodiment, the first rib 300 may be formed in a triangular shape in a plan view.

[0130] like Fig.13 As shown, the first rib 300 (or the second rib 350 ) may include a first inclined surface portion 301 a bent from the first side portion 220 and a second inclined surface portion 301 b bent from the first inclined surface portion 301 a and connected to the first side portion 220 .

[0131] In addition, the inclination angle of the first inclined surface portion 301a in the first convex ridge 300 relative to the first side portion 220 may be an obtuse angle, and specifically in the range of 130 to 140 degrees, or about 135 degrees. That is, the first inclined surface portion 301a may be in the range of 40 to 50 degrees, or about 45 degrees, relative to an imaginary line connecting the first inclined surface portion 301a and the second inclined surface portion 301b (the first inclined surface portion 301a and the second inclined surface portion 301b are separated from each other).

[0132] The second inclined surface portion 301b is bent at an end of the first inclined surface portion 301a and extends toward the first side portion 220, and the end of the second inclined surface portion 301b may be connected to the first side portion 220. The inclination angle of the second inclined surface portion 301b relative to the first side portion 220 may be the same as the inclination angle of the first inclined surface portion 301a relative to the first side portion 220. That is, the inclination angle of the second inclined surface portion 301b relative to the first side portion 220 may be an obtuse angle, and specifically in the range of 130 to 140 degrees, or about 135 degrees.

[0133] Furthermore, in the present embodiment, the plurality of first ribs 300 (or second ribs 350) disposed on the first side portion 220 may be formed such that their plane cross-sectional areas gradually increase while maintaining a triangular shape along the moving direction of the cooling air from one end of the first side portion 220 adjacent to the air inlet 201. That is, the inclination angle of the first inclined surface portion 301a of the plurality of first ribs 300 (or second ribs 350) disposed on the first side portion 220 may be the same as the inclination angle of the second inclined surface portion 301b, but may be formed such that as the plane cross-sectional area increases, the height D protruding from the first side portion 220 gradually increases along the moving direction of the cooling air from one end of the first side portion 220 adjacent to the air inlet 201.

[0134] Specifically, a height D of the first first rib 300 protruding from the first side portion 220 closest to the air inlet 201 may be within approximately 15% to 25% of a gap between the first side portion 220 and one end of the cell module assembly 100 (or the rear plate 120), a height D of the second first rib 300 protruding from the first side portion 220 may be within approximately 35% to 45% of a gap between the first side portion 220 and one end of the cell module assembly 100 (or the rear plate 120), and a height D of the third first rib 300 protruding from the first side portion 220 may be within approximately 55% to 65% of a gap between the first side portion 220 and one end of the cell module assembly 100 (or the rear plate 120).

[0135] In the present embodiment, the first rib 300 (or the second rib 350) may be arranged on the first side portion 220 to face the space between the cell module assemblies 100, and may be placed in a region where an extension of the space between the two cell module assemblies 100 meets the first side portion 220. In this way, by arranging the first rib 300 on the first side portion 220 to face the space between the cell module assemblies 100, cooling air may be smoothly guided into the space between the cell module assemblies 100.

[0136] In the present embodiment, the cooling air introduced through the air inlet 201 moves linearly and then moves along the first inclined surface portion 301a, thereby allowing the cooling air to be guided between the cell module assemblies 100. Fig.13 , the distances between the first ribs 300 are shown to be the same, but the distance between the first first rib 300 and the second first rib 300 is longer than the distance from the air inlet 210 to the first first rib.

[0137] [Test example]

[0138] In order to confirm the effect of reducing temperature deviation according to the present disclosure, temperature distribution simulation was performed using CFD (Computational Fluid Dynamics), and the results are shown in Fig.15 and Fig.16 Shown in.

[0139] Fig.14 are diagrams showing various test examples of the present disclosure and comparative examples, Fig.15 It is shown Fig.14 A diagram of the temperature distribution of the test sample is shown, and Fig.16 It is shown Fig.14 A graph of the flow rate for each cell module assembly in the test example shown.

[0140] Fig.14 An example of a rib application arrangement for performing a temperature distribution simulation is shown. Fig.14, case #1 shows a general battery pack without the ribs of the present disclosure, case #2 shows a battery pack according to the first embodiment of the present disclosure, wherein three ribs are arranged on the first side and each rib has a protrusion height of 15 mm, case #3 shows a battery pack according to the first embodiment of the present disclosure, wherein three ribs are arranged on the first side and each rib has a protrusion height of 7.5 mm, case #4 shows a battery pack according to the fourth embodiment of the present disclosure, wherein three ribs are arranged on the first side and the protrusion heights of the ribs are 5 mm, 10 mm and 15 mm respectively, case #5 shows a battery pack according to the third embodiment of the present disclosure, wherein three ribs are placed on each of the first side and the second side and each rib has a protrusion height of 7.5 mm, and case #6 shows a battery pack according to the fourth embodiment of the present disclosure, wherein three ribs with protrusion heights of 5 mm, 10 mm and 15 mm are arranged on the first side, and in addition, three ribs with protrusion heights of 5 mm, 10 mm and 15 mm are arranged on the second side.

[0141] The following Tables 1 and 2 show Fig.14 The results of the temperature distribution simulation for the corresponding case.

[0142] [Table 1] 0.25 CP heat source temperature

[0143] [Table 2] 0.5 CP heat source temperature

[0144] Table 1 shows the maximum temperature and the minimum temperature of each case when 25°C cooling air is injected at a 0.25 CP heat source temperature (1 cp is the power that can fully charge a battery in 1 hour), and Table 2 shows the maximum temperature and the minimum temperature of each case when 25°C cooling air is injected at a 0.5 CP heat source temperature, and shows that compared with the conventional case (case #1), in all cases (cases #2-6) according to the present disclosure, the temperature deviation is reduced, and the minimum temperature deviation is confirmed in case #4.

[0145] At the same time, Table 3 and Fig.16 The inflow flow rate of each case in the cell module assembly 100 is shown, wherein CMA#6 to CMA#1 indicate cell module assemblies (arranged sequentially in the direction from the air inlet 201 to the air outlet 202), CMA#6 represents the cell module assembly 100 closest to the air inlet 201, and CMA#1 represents the cell module assembly 100 closest to the air outlet 202.

[0146] It can be seen that the inflow flow rate generally increases from CMA #6 (which is the cell module assembly 100 closest to the air inlet 201) to the air outlet 202, and it can be seen that CMA #1 (which is the cell module assembly 100 closest to the air outlet 202) shows the highest inflow flow rate.

[0147] It is also shown that the flow rate deviation in the cases according to the present disclosure (Case #2 to Case #6) is reduced compared to Case #1, which is a general battery pack without the ribs of the present disclosure.

[0148] [Table 3]: Inflow rate of CMA [CMH]

[0149] As described above, the battery pack according to the present disclosure may improve the battery life by minimizing the temperature deviation, and may ensure the battery performance and the battery operation safety due to the improved battery life.

[0150] Although the present disclosure has been described with reference to the preferred embodiments as described above, the present disclosure is not limited to the above embodiments, and various changes and modifications may be made by a person skilled in the art to which the present disclosure belongs without departing from the concept of the present disclosure.

[0151] [Industrial Applicability]

[0152] The present disclosure may provide a battery pack in which temperature deviation between battery cell assemblies in the battery pack is improved, resulting in improved battery performance and increased battery life.

Claims

1. A battery pack with improved temperature deviation, the battery pack comprising: Multiple single module components; as well as a housing for accommodating the plurality of single module assemblies, Wherein, the housing comprises: an air inlet through which cooling air flows into the housing; an air outlet through which the cooling air is discharged from the housing; and A first side portion is disposed on a side of the housing, wherein the first side portion includes a plurality of first ribs protruding inwardly from the first side portion into the housing.

2. The battery pack according to claim 1, wherein: The housing further includes a second side portion disposed to face the first side portion.

3. The battery pack according to claim 2, further comprising: an inflow passage disposed inside the first side portion of the housing, through which the cooling air flowing in from the air inlet moves; as well as An outflow passage is disposed inside the second side portion of the housing, and the cooling air moves through the outflow passage to be discharged through the air outlet.

4. The battery pack according to claim 2, wherein: The housing further comprises: a third side portion disposed on the other side of the housing; and A fourth side portion is disposed to face the third side portion.

5. The battery pack according to claim 4, wherein: The air inlet is disposed on the third side, and the air outlet is disposed on the fourth side.

6. The battery pack according to claim 4, wherein: The plurality of cell module assemblies are arranged along a direction from the third side to the fourth side.

7. The battery pack according to claim 1, wherein: Each of the plurality of first ribs is formed such that an entire thickness of the first side portion protrudes inwardly into the housing.

8. The battery pack according to claim 1, wherein: Each of the plurality of first ribs is disposed on the first side portion to face a space between the plurality of single module assemblies.

9. The battery pack according to claim 1, wherein: Each of the plurality of first ridges has a trapezoidal shape in a plan view.

10. The battery pack according to claim 5, wherein: The plurality of first ribs are disposed within 1 / 2 of the length of the first side portion from one end of the first side portion connected to the third side portion.

11. The battery pack according to claim 10, wherein: The number of the plurality of first ribs is equal to or less than 1 / 2 of the number of the plurality of single module assemblies.

12. The battery pack according to claim 1, wherein: Each of the plurality of first ridges has a triangular shape in a plan view.

13. The battery pack according to claim 1, wherein: The heights of the plurality of first ribs protruding from the first side portion gradually increase along a moving direction of the cooling air flowing in from the air inlet.

14. The battery pack according to claim 13, wherein: A protrusion height of a first first rib among the plurality of first ribs that is first positioned from the air inlet from the first side portion is 15% to 25% of a gap between the first side portion and one end of the plurality of monomer module assemblies, a protrusion height of a second first rib among the plurality of first ribs that is second positioned from the air inlet is 35% to 45% of the gap between the first side portion and the one end of the plurality of monomer module assemblies, and a protrusion height of a third first rib among the plurality of first ribs that is third positioned from the air inlet is 55% to 65% of the gap between the first side portion and the one end of the plurality of monomer module assemblies.

15. The battery pack according to claim 1, wherein: A vertical height of the plurality of first ribs on the first side portion gradually increases along a moving direction of the cooling air flowing in from the air inlet.

16. The battery pack according to claim 2, wherein: The second side portion includes a plurality of second ribs that protrude inwardly from the second side portion into the housing.

17. The battery pack according to claim 16, wherein: The housing further comprises: a third side portion disposed on the other side of the housing; and a fourth side portion, the fourth side portion being disposed to face the third side portion, and The plurality of second ridges are arranged to correspond in sequence to the plurality of single module assemblies adjacent to the fourth side portion.

18. The battery pack according to claim 17, wherein: The heights of the plurality of second ribs protruding from the second side portion gradually decrease from the air outlet in a direction opposite to a moving direction of the cooling air.

19. The battery pack according to claim 18, wherein: The plurality of second ribs are disposed within 1 / 2 of the length of the second side portion from one end of the second side portion connected to the fourth side portion.

20. The battery pack according to claim 19, wherein: The number of the plurality of second ribs is equal to or less than 1 / 2 of the number of the plurality of single module assemblies.

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