KR20240082142A - Battery pack - Google Patents

Abstract

The battery pack includes a housing including a plate portion; a plurality of battery devices disposed on the upper surface of the plate portion of the housing; a cover plate disposed on the lower surface of the plate portion of the housing; and a plurality of fastening members for fixing the cover plate and the housing, wherein each of the plurality of fastening members includes a head portion and a cylindrical portion (shank) having a smaller diameter than the head portion, and the plurality of fastening members The head portion of each fastening member contacts the cover plate.

Description

Battery pack{BATTERY PACK}

The present invention relates to a battery pack.

Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as an energy source for various wireless devices such as handsets, laptops, and cordless vacuum cleaners. Recently, the manufacturing cost per unit capacity of secondary batteries has dramatically decreased due to improvements in energy density and economies of scale, and as the range of battery electric vehicles (BEVs) has increased to the same level as fuel vehicles, the main uses of secondary batteries are is moving from mobile devices to mobility.

The trend in technology development of secondary batteries for mobility is improvement in energy density and safety. Here, the energy density of the secondary battery is the maximum electrical energy that the secondary battery can store divided by the mass of the secondary battery. The high energy density of secondary batteries is directly related to the driving efficiency and range of mobility, and various studies are being conducted to improve the energy density of secondary batteries.

Chinese Patent Publication No. 214542426

The problem to be solved by the technical idea of the present invention is to provide a battery pack with improved safety and energy density.

According to exemplary embodiments of the present invention for solving the above-described problems, a battery pack is provided. The battery pack includes a housing including a plate portion; a plurality of battery devices disposed on the upper surface of the plate portion of the housing; a cover plate disposed on the lower surface of the plate portion of the housing; and a plurality of fastening members for fixing the cover plate and the housing, wherein each of the plurality of fastening members includes a head portion and a cylindrical portion (shank) having a smaller diameter than the head portion, and the plurality of fastening members The head portion of each fastening member contacts the cover plate.

The cylindrical portion of each of the plurality of fastening members contacts the housing.

The housing is configured to allow fluid to flow and includes a plurality of channels extending along a first direction parallel to the upper surface of the plate portion.

The plurality of fastening members are interposed between the plurality of channels.

The housing is interposed between the plurality of channels, extends along the first direction, and includes a plurality of ribs.

The plurality of fastening members are coupled to the plurality of ribs.

The width of each of the plurality of ribs ranges from 5 mm to 20 mm.

The housing includes a plurality of cavities, which are empty spaces interposed between the plurality of channels and the plurality of ribs and extending along the first direction.

The housing includes a plurality of first ribs interposed between the plurality of channels and extending along the first direction, and a plurality of second ribs.

Each of the plurality of fastening members is coupled to a corresponding one of the plurality of first ribs.

Each of the plurality of fastening members is spaced apart from the plurality of second ribs.

A width of each of the plurality of first ribs in a second direction perpendicular to the first direction is equal to a width of each of the second ribs in the second direction.

A width of each of the plurality of first ribs in a second direction perpendicular to the first direction is different from a width of each of the second ribs in the second direction.

A width of each of the plurality of first ribs in a second direction perpendicular to the first direction is greater than a width of each of the plurality of second ribs in the second direction.

The housing extends along the first direction and includes first and second plates welded to each other.

Each of the plurality of fastening members is spaced apart from a welded surface of the first plate and the second plate.

The plurality of fastening members are arranged in a matrix.

The plurality of fastening members are arranged in a zigzag pattern.

The housing includes a plurality of thread receiving portions that contact the threads of the plurality of fastening members.

The housing is configured to allow fluid to flow, and includes a plurality of channels extending along a first direction parallel to the upper surface of the plate portion, and the plurality of threaded receiving portions are at the same level as the plurality of channels. .

According to exemplary embodiments of the present invention, a plurality of fastening members for fixing the cover plate and the housing may be inserted into the housing from the lower surface of the cover plate. Accordingly, the cover plate and housing can be fixed without additional elements such as brackets, thereby improving the energy density of the battery pack. Additionally, the plurality of fastening members can be prevented from interfering with battery cells mounted on the housing, thereby improving the safety of the battery pack.

The effects that can be obtained from the exemplary embodiments of the present invention are not limited to the effects mentioned above, and other effects not mentioned are known to those skilled in the art to which the exemplary embodiments of the present disclosure belong from the following description. It can be clearly derived and understood by those who have it. That is, unintended effects resulting from implementing exemplary embodiments of the present disclosure may also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

1 is a top view of a battery pack according to example embodiments.
2 is a bottom view of a battery pack according to example embodiments.
FIG. 3 is a cross-sectional view taken along the cutting line 2I-2I' in FIG. 2.
4 is a bottom view of a battery pack according to example embodiments.
FIG. 5 is a cross-sectional view taken along the cutting line 4I-4I' of FIG. 4.
6 is a bottom view of a battery pack according to example embodiments.
FIG. 7 is a cross-sectional view taken along the cutting line 6I-6I' of FIG. 6.
8 is a bottom view of a battery pack according to example embodiments.
FIG. 9 is a cross-sectional view taken along the cutting line 8I-8I' of FIG. 8.
10 is a bottom view of a battery pack according to example embodiments.
FIG. 11 is a cross-sectional view taken along the cutting line 10I-10I' of FIG. 10.
FIG. 12 shows a portion corresponding to FIG. 3.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, the terms or words used in this specification and claims should not be construed as limited to their usual or dictionary meanings, and the inventor should appropriately use the concept of terms to explain his or her invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle of definability.

Accordingly, the embodiments described in this specification and the configurations shown in the drawings are only one of the most preferred embodiments of the present invention and do not represent the entire technical idea of the present invention, so at the time of filing this application, various alternatives are available to replace them. It should be understood that equivalents and variations may exist.

Additionally, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

Since the embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or schematically shown for clearer description. Therefore, the size or ratio of each component does not entirely reflect the actual size or ratio.

(First Example)

1 is a top view of a battery pack 100 according to example embodiments.

Figure 2 is a bottom view of the battery pack 100 according to example embodiments. In Figure 2, the cover plate 150 is omitted for a more complete understanding of the present invention.

FIG. 3 is a cross-sectional view taken along the cutting line 2I-2I' in FIG. 2.

1 to 3, the battery pack 100 includes a housing 110, a plurality of battery devices 120, a center beam 131, a plurality of cross beams 133, and a plurality of exhaust devices 140. ), a cover plate 150, a plurality of fastening members 160, and a thermal interface material (TIM) 170. The battery pack 100 is the final form of a battery system installed in mobility, etc.

The housing 110 may provide a space for mounting a plurality of battery devices 120. The housing 110 includes a first plate 111, a second plate 112, a third plate 113, a first side wall 114, a second side wall 115, a third side wall 116, and a fourth side wall. It may include (117).

The first to third plates 111, 112, and 113 may form the plate portion 110P. The plate 110P may include an upper surface 110U and a lower surface 110L that are substantially parallel to each other. Two directions substantially parallel to the upper surface 110U of the plate portion 110P are defined as the X direction and Y direction, and a direction substantially perpendicular to the plate portion 110P of the housing 110 is defined as the Z direction. Each of the X, Y, and Z directions may be substantially perpendicular to each other. Unless otherwise stated, the definition of direction is the same for the following drawings.

The first plate 111 may contact the second plate 112, and the second plate 112 may contact the third plate 113. The first to third plates 111, 112, and 113 may be joined by, for example, friction stir welding. The first plate 111 may be welded to the second plate 112, and the second plate 112 may be welded to the third plate 113. Accordingly, the plate portion 110P is formed at the first welding surface JS1, which is the boundary between the first plate 111 and the second plate 112, and between the second plate 112 and the third plate 113. It may include a second welding surface (JS2), which is the boundary surface of .

The first plate 111 may include a plurality of channels 111CH, a plurality of cavities 111C, and a plurality of ribs 111R. Each of the channels 111CH, the cavities 111C, and the ribs 111R may extend in the X direction.

According to example embodiments, the plurality of channels 111CH may provide a path for fluid to flow to cool the battery pack 100. A plurality of channels may be spaced apart in the Y direction. A plurality of channels may be arranged along the Y direction.

The plurality of cavities 111C are empty spaces formed inside the first plate 111. Due to the formation of the plurality of cavities 111C, the mass of the first plate 111 may be reduced, and thus the energy density of the battery pack 100 may be improved. The plurality of cavities 111C may be interposed between the plurality of channels 111CH and the plurality of ribs 111R.

A plurality of ribs 111R may be interposed between a plurality of channels 111CH. The plurality of ribs 111R may be alternately arranged with the plurality of channels 111CH in the Y direction. The plurality of ribs 111R are lattices that maintain the rigidity of the first plate 111. The width of the plurality of ribs 111R may range from about 5 mm to about 20 mm.

The second plate 112 may include a plurality of channels 112CH, a plurality of cavities 112C, and a plurality of ribs 112R. Each of the channels 112CH, the cavities 112C, and the ribs 112R may extend in the X direction.

According to example embodiments, the plurality of channels 112CH may provide a path through which fluid for cooling the battery pack 100 flows. A plurality of channels may be spaced apart in the Y direction. A plurality of channels may be arranged along the Y direction.

The plurality of cavities 112C are empty spaces formed inside the second plate 112. Due to the formation of the plurality of cavities 112C, the mass of the second plate 112 may be reduced, and thus the energy density of the battery pack 100 may be improved. The plurality of cavities 112C may be interposed between the plurality of channels 112CH and the plurality of ribs 112R.

A plurality of ribs 112R may be interposed between a plurality of channels 112CH. The plurality of ribs 112R may be alternately arranged with the plurality of channels 112CH in the Y direction. The plurality of ribs 112R are lattices that maintain the rigidity of the second plate 112. The width of the plurality of ribs 112R may range from about 5 mm to about 20 mm.

The third plate 113 may include a plurality of channels 113CH, a plurality of cavities 113C, and a plurality of ribs 113R. Each of the channels 113CH, the cavities 113C, and the ribs 113R may extend in the X direction.

According to example embodiments, the plurality of channels 113CH may provide a path through which fluid for cooling the battery pack 100 flows. A plurality of channels may be spaced apart in the Y direction. A plurality of channels may be arranged along the Y direction.

The plurality of cavities 113C are empty spaces formed inside the third plate 113. Due to the formation of the plurality of cavities 113C, the mass of the third plate 113 may be reduced, and thus the energy density of the battery pack 100 may be improved. The plurality of cavities 113C may be interposed between the plurality of channels 113CH and the plurality of ribs 113R.

A plurality of ribs 113R may be interposed between a plurality of channels 113CH. The plurality of ribs 113R may be alternately arranged with the plurality of channels 113CH in the Y direction. The plurality of ribs 113R are lattices that maintain the rigidity of the third plate 113. The width of the plurality of ribs 113R may range from about 5 mm to about 20 mm.

A plurality of battery devices 120 may be disposed on the upper surface 110U of the plate portion 110P of the housing 110. The plate portion 110P may support a plurality of battery devices 120. The first to fourth side walls 114, 115, 116, and 117 may horizontally surround the plurality of battery devices 120. The first to fourth side walls 114, 115, 116, and 117 may protect the plurality of battery devices 120.

The first and second side walls 114 and 115 may be substantially perpendicular to the Y direction. Each of the third and fourth side walls 116 and 117 may be substantially perpendicular to the X direction. The lower surfaces of the first and second side walls 114 and 115 may be coplanar with the lower surface 110L of the plate portion 110P. The third and fourth side walls 116 and 117 may be disposed on the plate portion 110P.

Hereinafter, the technical idea of the present invention will be described with reference to an embodiment in which the battery pack 100 is a moduleless type and each of the plurality of battery devices 120 does not include a module frame. However, this is a non-limiting example and does not limit the technical idea of the present invention in any way. A person skilled in the art will be able to easily arrive at a plurality of battery devices including a module frame and a module-type battery pack including the same based on what is described herein.

Each of the plurality of battery devices 120 may include a plurality of battery cells 121 . A plurality of battery cells 121 may be connected to each other in series or parallel to form a battery assembly. Each of the plurality of battery devices 120 may further include a bus bar plate and an end plate.

The plurality of battery cells 121 are the basic unit of a lithium ion battery, that is, a secondary battery. Each of the plurality of battery cells 121 includes an electrode assembly, an electrolyte, and a case. The plurality of battery cells 121 are classified into lithium ion batteries, lithium ion polymer batteries, lithium polymer batteries, etc. depending on the composition of the electrode assembly and electrolyte. Lithium-ion polymer batteries are increasing their market share in secondary batteries because they are less likely to leak electrolyte and are easier to manufacture.

Each of the plurality of battery cells 121 may be one of a cylindrical battery cell, a prismatic battery cell, and a pouch-type battery cell. The electrode assembly of a cylindrical battery cell is embedded in a cylindrical metal can. The electrode assembly of the prismatic battery cell is embedded in a prismatic metal can. The electrode assembly of the pouch-type battery cell is embedded in a pouch case containing aluminum laminate sheets.

The electrode assembly built into the battery case includes an anode, a cathode, and a separator interposed between the anode and the cathode. Electrode assemblies are classified into jelly-roll type and stack type according to assembly type. The jelly roll type is made by winding an anode, a cathode, and a separator sandwiched between them. The stack type includes a plurality of sequentially stacked anodes, a plurality of cathodes, and a plurality of separators interposed between them.

According to example embodiments, the plurality of battery cells 121 may be connected in series and/or in parallel. As an example, a plurality of battery cells 121 may be connected to each other in series. As another example, the plurality of battery cells 121 may be connected to each other in parallel. As another example, a plurality of battery cells 121 connected in parallel may form groups, and the groups of the plurality of battery cells 121 may be connected in series.

Each of the negative leads of the series-connected battery cells 121 may be coupled to the positive lead of the following battery cell 121. Each of the negative leads of the series-connected battery cells 121 may be welded to the positive lead of the subsequent battery cell 121.

The positive electrode leads of the plurality of battery cells 121 connected in parallel may be coupled to each other, and the negative leads of the plurality of battery cells 121 connected in parallel may be coupled to each other. The positive electrode leads of the plurality of battery cells 121 connected in parallel may be welded together, and the negative leads of the plurality of battery cells 121 connected in parallel may be welded together.

The plurality of battery devices 120 may be arranged in the X and Y directions. In FIG. 1, the number of battery devices 120 arranged in the X direction is three, and the number of battery devices 120 arranged in the Y direction is two. Accordingly, the arrangement of the plurality of battery devices 120 can be said to be a 3 * 2 arrangement. A person skilled in the art will be able to easily arrive at a plurality of battery devices 120 arranged in M * N (where M and N are each integers of 2 or more) based on what is described herein.

A TIM 170 may be interposed between the battery cells 121 and the upper surface 110U of the plate portion 110P. The TIM 170 may be configured to mediate heat between the battery cells 121 and the plate portion 110P. The TIM 170 can prevent an air layer from forming between the battery cells 121 and the plate portion 110P. The TIM 170 may fix the battery cells 121 and the plate portion 110P to each other. TIM 170 may include either polyurethane or silicone.

The center beam 131 and the plurality of cross beams 133 may isolate elements mounted on the housing 110 from each other. Accordingly, the center beam 131 and the plurality of cross beams 133 can protect the plurality of battery devices 120 and simultaneously prevent unwanted short circuits between them.

The center beam 131 may extend between the opposing third and fourth side walls 116 and 117. The center beam 131 may extend in the X direction. The center beam 131 may be in contact with the third side wall 116 and may be spaced apart from the fourth side wall 117. The center beam 131 may isolate the plurality of battery devices 120 from each other. The center beam 131 may be interposed between the plurality of battery devices 120.

According to example embodiments, the plurality of cross beams 133 may extend in a direction perpendicular to the center beam 131 (eg, Y direction). According to exemplary embodiments, the plurality of cross beams 133 may extend between the first side wall 114 and the center beam 131 or between the second side wall 115 and the center beam 131. . According to example embodiments, the plurality of cross beams 133 may contact one of the first and second side walls 114 and 115 and the center beam 131. The plurality of cross beams 133 may isolate the plurality of battery devices 120 from each other. The plurality of cross beams 133 may be interposed between the plurality of battery devices 120.

The arrangement of the center beam 131 and the cross beams 133 and the resulting arrangement of the plurality of battery devices 120 disclosed in FIG. 1 are non-limiting examples and do not limit the technical idea of the present invention in any sense. A person skilled in the art will be able to easily arrive at a battery pack including various arrangements and numbers of center beam, cross beams and battery devices based on what is described herein.

A plurality of exhaust devices 140 may be coupled to the fourth side wall 117. The fourth side wall 117 may include a plurality of exhaust holes connected to a plurality of exhaust devices 140 . The plurality of exhaust holes may be configured to provide a path for discharging gas and heat inside the battery pack 100.

When at least one of the plurality of battery devices 120 is in a thermal runaway state, the plurality of exhaust devices 140 emit high temperature gas inside the battery pack 100 to the outside to propagate heat ( It can be configured to delay thermal propagation.

Here, thermal runaway of the plurality of battery devices 120 is a state in which the temperature change of the plurality of battery devices 120 further accelerates the temperature change, and is an uncontrollable positive feedback. The plurality of battery devices 120 in a thermal runaway state exhibit a rapid increase in temperature and emit a large amount of high-pressure gas and combustion debris.

The cover plate 150 may be disposed on the lower surface 110L of the plate portion 110P of the housing 110. As a non-limiting example, cover plate 150 may include aluminum, for example. The cover plate 150 may protect the plate portion 110P. The cover plate 150 can supplement the rigidity of the plate portion 110P.

According to example embodiments, the cover plate 150 may be fixed to the plate portion 110P by a plurality of fastening members 160. According to example embodiments, the plurality of fastening members 160 may be arranged in a matrix form when viewed from the bottom. A plurality of fastening members 160 arranged in the X direction may form an array extending in the X direction. A plurality of arrays composed of a plurality of fastening members 160 may be arranged in the Y direction.

According to example embodiments, each of the plurality of fastening members 160 may be a bolt. According to example embodiments, each of the plurality of fastening members 160 may include a head portion 160H and a cylindrical portion (shank) 160S. The cylindrical portion 160S of each of the plurality of fastening members 160 may include a first portion in which a screw thread 160T is formed and a second portion interposed between the first portion and the head portion 160H. .

According to other exemplary embodiments, the plate portion 110P of the housing 110 may further include insert nuts such as helical inserts therebetween. The insert nuts are fixed to the plate portion 110P of the housing and may include an embedded flange formed through a blind insert process or the like and embedded within the plate portion 110P. Accordingly, each of the plurality of fastening members 160 can be coupled to the plate portion 110P of the housing 110 by insert nuts, and the mechanical reliability of the battery pack 100 can be improved.

According to exemplary embodiments, the plurality of fastening members 160 may be inserted from the cover plate 150 into the plate portion 110P of the housing 110. Accordingly, the cover plate 150 and the housing 110 can be fixed without additional elements such as brackets, thereby improving the energy density of the battery pack 100. Additionally, the plurality of fastening members 160 can be prevented from interfering with the plurality of battery cells 121, thereby improving the safety of the battery pack 100.

According to exemplary embodiments, the head portion 160H of the plurality of fastening members 160 may contact the cover plate 150. According to exemplary embodiments, the head portion 160H of the plurality of fastening members 160 may contact the lower surface of the cover plate 150. The upper surface of the cover plate 150 faces the plate portion 110P, and the lower surface of the cover plate 150 is opposite to the upper surface.

According to exemplary embodiments, the cylindrical portion 160S of each of the plurality of fastening members 160 includes a plurality of ribs 111R and 112R of any one of the first to third plates 111, 112, and 113. , 113R). According to example embodiments, the plurality of ribs 111R, 112R, and 113R may include a receiving groove for accommodating the cylindrical portion 160S. Each of the plurality of receiving grooves may include a screw thread receiving portion having a shape complementary to the screw thread 160T of the cylindrical portion 160S. The thread receiving portion may overlap a plurality of channels 111CH, 112CH, and 113CH horizontally (i.e., in the Y direction). The thread receiving portion may be at the same level as the plurality of channels 111CH, 112CH, and 113CH.

According to example embodiments, a plurality of fastening members 160 coupled to the first plate 111 may be alternately arranged with a plurality of channels 111CH. A plurality of cavities 111C may be interposed between the plurality of fastening members 160 coupled to the first plate 111 and the plurality of channels 111CH.

According to example embodiments, a plurality of fastening members 160 coupled to the second plate 112 may be alternately arranged with a plurality of channels 112CH. A plurality of cavities 112C may be interposed between the plurality of fastening members 160 coupled to the second plate 112 and the plurality of channels 112CH.

According to example embodiments, a plurality of fastening members 160 coupled to the third plate 113 may be alternately arranged with a plurality of channels 113CH. A plurality of cavities 113C may be interposed between the plurality of fastening members 160 coupled to the third plate 113 and the plurality of channels 113CH.

According to example embodiments, the plurality of fastening members 160 may be spaced apart horizontally (eg, in the Y direction) from the first and second welding surfaces JS1 and JS2. The first and second welding surfaces JS1 and JS2 have weaker strength than the first to third plates 111, 112, and 113. According to exemplary embodiments, mechanical reliability of the battery pack 100 can be improved by not coupling the plurality of fastening members 160 to the first and second welding surfaces JS1 and JS2.

The battery pack 100 may further include electrical components. Electrical components may be mounted on the housing 110. Electrical components may be disposed between the fourth side wall 117 where the exhaust devices 140 are installed and the plurality of battery devices 120. Electrical components may include any electronic elements necessary to drive the battery pack.

Electrical components may include, for example, a Battery Management System (BMS). The BMS can be configured to monitor, balance, and control the battery pack. Monitoring of the battery pack 100 may include measuring the voltage and current of specific nodes within the plurality of battery devices 120 and measuring the temperature of set locations within the battery pack 100. Battery pack 100 may include instruments for measuring the voltage, current, and temperature described above.

Balancing the battery pack 100 is an operation to reduce the deviation between the plurality of battery devices 120. Control of the battery pack 100 includes preventing the occurrence of overcharge, overdischarge, and overcurrent. Through monitoring, balancing, and control, the battery pack 100 can operate under optimal conditions, thereby preventing the lifespan of each of the plurality of battery devices 120 from being shortened.

Electrical components may further include a cooling device, Power Relay Assembly (PRA), safety plug, etc. The cooling device may include a cooling fan. The cooling fan can prevent each of the plurality of battery devices 120 from overheating by circulating air inside the battery pack 100. The PRA may be configured to supply or block power from the high-voltage battery to an external load (eg, a vehicle motor). PRA can protect the plurality of battery devices 120 and external loads (e.g., vehicle motor) by blocking the power supply to external loads (e.g., vehicle motor) in situations where abnormal voltage such as voltage surge occurs. there is.

The battery pack 100 may further include a plurality of bus bars configured to electrically connect the plurality of battery devices 120. The plurality of battery devices 120 may be connected in series by a plurality of bus bars. Accordingly, the battery pack 100 may be configured to output high voltage to an external load (eg, a vehicle motor).

The battery pack 100 may further include a lead plate coupled to the first to fourth sidewalls 114, 115, 116, and 117. The lead plate may cover elements mounted inside the battery pack 100, such as battery devices 120 and electrical components. The lead plate may be fixed to the battery pack 100 by, for example, a mechanical coupling means such as a fastening member.

(Second Embodiment)

4 is a bottom view of a battery pack according to example embodiments. In Figure 4, the cover plate 150 is omitted for a more complete understanding of the present invention.

FIG. 5 is a cross-sectional view taken along the cutting line 4I-4I' of FIG. 4.

4 and 5, the battery pack 100a includes a housing 110a, a plurality of battery devices 120, a center beam 131, a plurality of cross beams 133 (see FIG. 1), and a plurality of exhaust It may include devices 140, a cover plate 150, a plurality of fastening members 160, and a TIM 170. The battery pack 100a is the final form of a battery system installed in mobility, etc.

A plurality of battery devices 120, a center beam 131, a plurality of cross beams 133 (see FIG. 1), a plurality of exhaust devices 140, and a cover plate 150 are shown in FIGS. 1 to 3. Since they are substantially the same as those described above, duplicate descriptions thereof will be omitted.

According to example embodiments, the housing 110a may provide a space for mounting a plurality of battery devices 120. The housing 110a includes a first plate 111a, a second plate 112a, a third plate 113a, a first side wall 114, a second side wall 115, a third side wall 116, and a fourth side wall. It may include (117). Since the first to fourth side walls 114, 115, 116, and 117 are substantially the same as those described with reference to FIGS. 1 to 3, duplicate description thereof will be omitted.

The first to third plates 111a, 112a, and 113a may form the plate portion 110aP. The first plate 111a may contact the second plate 112a, and the second plate 112a may contact the third plate 113a. The first plate 111a may be welded to the second plate 112a, and the second plate 112a may be welded to the third plate 113a. The plate portion 110aP is a first welding surface JS1a, which is an interface between the first plate 111a and the second plate 112a, and an interface between the second plate 112a and the third plate 113a. It may include a second welding surface (JS2a).

The first plate 111a may include a plurality of channels 111aCH, a plurality of cavities 111aC, a first rib 111aR1, and a second rib 111aR2. Each of the channels 111aCH, the cavities 111aC, the first rib 111aR1, and the second rib 111aR2 may extend in the X direction. According to example embodiments, the width (eg, Y-direction width) of the first rib 111aR1 may be substantially equal to the width (eg, Y-direction width) of the second rib 111aR2.

The second plate 112a may include a plurality of channels 112aCH, a plurality of cavities 112aC, a first rib 112aR1, and a second rib 112aR2. Each of the channels 112aCH, the cavities 112aC, the first rib 112aR1, and the second rib 112aR2 may extend in the X direction. According to example embodiments, the width (eg, Y-direction width) of the first rib 112aR1 may be substantially equal to the width (eg, Y-direction width) of the second rib 112aR2.

The third plate 113 may include a plurality of channels 113CH, a plurality of cavities 113C, a first rib 113aR1, and a second rib 113aR2. Each of the plurality of channels 113CH, the plurality of cavities 113C, and the first rib 113aR1 and the second rib 113aR2 may extend in the X direction. According to example embodiments, the width (eg, Y-direction width) of the first rib 113aR1 may be substantially equal to the width (eg, Y-direction width) of the second rib 113aR2.

Shape, function and arrangement of a plurality of channels (111aCH, 112aCH, 113aCH), a plurality of cavities (111aC, 112aC, 113aC), and first and second ribs (111aR1, 112aR1, 113aR1, 111aR2, 112aR2, 113aR3) is substantially the same as that described with reference to FIGS. 1 to 3, so duplicate description thereof will be omitted.

According to example embodiments, the cover plate 150 may be fixed to the plate portion 110aP by a plurality of fastening members 160. According to example embodiments, the plurality of fastening members 160 may be arranged in a matrix form when viewed from the bottom. A plurality of fastening members 160 arranged in the X direction may form an array extending in the X direction. A plurality of arrays composed of a plurality of fastening members 160 may be arranged in the Y direction.

According to example embodiments, the cylindrical portion 160S of each of the plurality of fastening members 160 may be coupled to any one of the first ribs 111aR1, 112aR1, and 113aR1. According to example embodiments, the cylindrical portion 160S of each of the plurality of fastening members 160 may not be coupled to the second ribs 111aR2, 112aR2, and 113aR2. According to example embodiments, the cylindrical portion 160S of each of the plurality of fastening members 160 may be spaced apart from the second ribs 111aR2, 112aR2, and 113aR2. According to exemplary embodiments, the cylindrical portion 160S of each of the plurality of fastening members 160 may be spaced apart from the first and second welding surfaces JS1a and JS2a.

According to example embodiments, each of the first ribs 111aR1, 112aR1, and 113aR1 may include a plurality of receiving grooves for receiving the cylindrical portion 160S. Each of the plurality of receiving grooves may include a screw thread receiving portion having a shape complementary to the screw thread 160T of the cylindrical portion 160S. The second ribs 111aR2, 112aR2, and 113aR2 may not include a receiving groove for receiving the cylindrical portion 160S.

According to example embodiments, the plurality of fastening members 160 are coupled only to the first ribs 111aR1, 112aR1, and 113aR1, and are not coupled to the second ribs 111aR2, 112aR2, and 113aR2. Accordingly, the housing 110a and the cover plate 150 can be fixed reliably, and the energy density of the battery pack 100a can be improved.

(Third Embodiment)

Figure 6 is a bottom view of the battery pack 100b according to example embodiments. In Figure 6, the cover plate 150 is omitted for a more complete understanding of the present invention.

FIG. 7 is a cross-sectional view taken along the cutting line 6I-6I' of FIG. 6.

6 and 7, the battery pack 100b includes a housing 110b, a plurality of battery devices 120, a center beam 131, a plurality of cross beams 133 (see FIG. 1), and a plurality of exhaust It may include devices 140, a cover plate 150, a plurality of fastening members 160, and a TIM 170. The battery pack 100b is the final form of a battery system installed in mobility, etc.

A plurality of battery devices 120, a center beam 131, a plurality of cross beams 133 (see FIG. 1), a plurality of exhaust devices 140, and a cover plate 150 are shown in FIGS. 1 to 3. Since they are substantially the same as those described above, duplicate descriptions thereof will be omitted.

According to example embodiments, the housing 110b may provide a space for mounting a plurality of battery devices 120. The housing 110b includes a first plate 111b, a second plate 112b, a third plate 113b, a first side wall 114, a second side wall 115, a third side wall 116, and a fourth side wall. It may include (117). Since the first to fourth side walls 114, 115, 116, and 117 are substantially the same as those described with reference to FIGS. 1 to 3, duplicate description thereof will be omitted.

The first to third plates 111b, 112b, and 113b may form the plate portion 110bP. The first plate 111b may contact the second plate 112b, and the second plate 112b may contact the third plate 113b. The first plate 111b may be welded to the second plate 112b, and the second plate 112b may be welded to the third plate 113b. The plate portion 110bP is a first welding surface JS1b, which is an interface between the first plate 111b and the second plate 112b, and an interface between the second plate 112b and the third plate 113b. It may include a second welding surface (JS2b).

The first plate 111a may include a plurality of channels 111bCH, a plurality of cavities 111bC, a first rib 111bR1, and a second rib 111bR2. Each of the channels 111bCH, the cavities 111bC, the first rib 111bR1, and the second rib 111bR2 may extend in the X direction. According to example embodiments, the width (eg, Y-direction width) of the first rib 111bR1 may be different from the width (eg, Y-direction width) of the second rib 111bR2. According to example embodiments, the width (eg, Y-direction width) of the first rib 111bR1 may be larger than the width (eg, Y-direction width) of the second rib 111bR2.

The second plate 112b may include a plurality of channels 112bCH, a plurality of cavities 112bC, a first rib 112bR1, and a second rib 112bR2. Each of the channels 112bCH, the cavities 112bC, the first rib 112bR1, and the second rib 112bR2 may extend in the X direction. According to example embodiments, the width (eg, Y-direction width) of the first rib 112bR1 may be different from the width (eg, Y-direction width) of the second rib 112bR2. According to example embodiments, the width (eg, Y-direction width) of the first rib 112bR1 may be larger than the width (eg, Y-direction width) of the second rib 112bR2.

The third plate 113 may include a plurality of channels 113CH, a plurality of cavities 113C, a first rib 113bR1, and a second rib 113bR2. Each of the plurality of channels 113CH, the plurality of cavities 113C, and the first rib 113bR1 and the second rib 113bR2 may extend in the X direction. According to example embodiments, the width (eg, Y-direction width) of the first rib 113bR1 may be different from the width (eg, Y-direction width) of the second rib 113bR2. According to example embodiments, the width (eg, Y-direction width) of the first rib 113bR1 may be larger than the width (eg, Y-direction width) of the second rib 113bR2.

Shape, function and arrangement of a plurality of channels (111bCH, 112bCH, 113bCH), a plurality of cavities (111bC, 112bC, 113bC), and first and second ribs (111bR1, 112bR1, 113bR1, 111bR2, 112bR2, 113bR3) is substantially the same as that described with reference to FIGS. 1 to 3 except for the widths of the first and second ribs 111bR1, 112bR1, 113bR1, 111bR2, 112bR2, and 113bR3, so duplicate description thereof will be omitted.

According to example embodiments, the cover plate 150 may be fixed to the plate portion 110bP by a plurality of fastening members 160. According to example embodiments, the plurality of fastening members 160 may be arranged in a matrix form when viewed from the bottom. A plurality of fastening members 160 arranged in the X direction may form an array extending in the X direction. A plurality of arrays composed of a plurality of fastening members 160 may be arranged in the Y direction.

According to example embodiments, the cylindrical portion 160S of each of the plurality of fastening members 160 may be coupled to any one of the first ribs 111bR1, 112bR1, and 113bR1. According to example embodiments, the cylindrical portion 160S of each of the plurality of fastening members 160 may not be coupled to the second ribs 111bR2, 112bR2, and 113bR2. According to exemplary embodiments, the cylindrical portion 160S of each of the plurality of fastening members 160 may be spaced apart from the second ribs 111bR2, 112bR2, and 113bR2. According to exemplary embodiments, the cylindrical portion 160S of each of the plurality of fastening members 160 may be spaced apart from the first and second welding surfaces JS1b and JS2b.

According to example embodiments, each of the first ribs 111bR1, 112bR1, and 113bR1 may include a plurality of receiving grooves for receiving the cylindrical portion 160S. Each of the plurality of receiving grooves may include a screw thread receiving portion having a shape complementary to the screw thread 160T of the cylindrical portion 160S. The second ribs 111bR2, 112bR2, and 113bR2 may not include a receiving groove for receiving the cylindrical portion 160S.

According to exemplary embodiments, the second ribs to which the plurality of fastening members 160 are not coupled compared to the width of the first ribs 111bR1, 112bR1, and 113bR1 to which the plurality of fastening members 160 are coupled. The width of (111bR2, 112bR2, 113bR2) is small. Accordingly, the housing 110b can be lightweight, and the energy density of the battery pack 100c can be improved.

(Fourth Embodiment)

Figure 8 is a bottom view of the battery pack 100c according to example embodiments. In Figure 8, the cover plate 150 is omitted for a more complete understanding of the present invention.

FIG. 9 is a cross-sectional view taken along the cutting line 8I-8I' of FIG. 8.

8 and 9, the battery pack 100c includes a housing 110c, a plurality of battery devices 120, a center beam 131, a plurality of cross beams 133 (see FIG. 1), and a plurality of exhaust It may include devices 140, a cover plate 150, a plurality of fastening members 160, and a TIM 170. The battery pack 100c is the final form of a battery system installed in mobility, etc.

A plurality of battery devices 120, a center beam 131, a plurality of cross beams 133 (see FIG. 1), a plurality of exhaust devices 140, and a cover plate 150 are shown in FIGS. 1 to 3. Since they are substantially the same as those described above, duplicate descriptions thereof will be omitted.

According to example embodiments, the housing 110c may provide a space for mounting a plurality of battery devices 120. The housing 110c includes a first plate 111c, a second plate 112c, a third plate 113c, a first side wall 114, a second side wall 115, a third side wall 116, and a fourth side wall. It may include (117). Since the first to fourth side walls 114, 115, 116, and 117 are substantially the same as those described with reference to FIGS. 1 to 3, duplicate description thereof will be omitted.

The first to third plates 111c, 112c, and 113c may form the plate portion 110cP. The first plate 111c may contact the second plate 112c, and the second plate 112c may contact the third plate 113c. The first plate 111c may be welded to the second plate 112c, and the second plate 112c may be welded to the third plate 113c. The plate portion 110cP has a first welding surface JS1c, which is the interface between the first plate 111c and the second plate 112c, and an interface between the second plate 112c and the third plate 113c. It may include a second welding surface (JS2c).

The first plate 111c may include a plurality of channels 111cCH, a plurality of cavities 111cC, and a plurality of ribs 111cR. The second plate 112c may include a plurality of channels 112cCH, a plurality of cavities 112cC, and a plurality of ribs 112cR. The third plate 113 may include a plurality of channels 113CH, a plurality of cavities 113C, and a plurality of ribs 113cR.

The shape, function, and arrangement of the plurality of channels (111cCH, 112cCH, 113cCH), the plurality of cavities (111cC, 112cC, 113cC), and the plurality of ribs (111cR, 112cR, 113cR) are shown with reference to FIGS. 1 to 3. Since they are substantially the same as those described above, duplicate descriptions thereof will be omitted.

According to example embodiments, the cover plate 150 may be fixed to the plate portion 110cP by a plurality of fastening members 160. According to example embodiments, the plurality of fastening members 160 may be arranged in a zigzag pattern when viewed from the bottom.

According to example embodiments, the cylindrical portion 160S of each of the plurality of fastening members 160 may be coupled to any one of the plurality of ribs 111cR, 112cR, and 113cR. According to exemplary embodiments, the cylindrical portion 160S of each of the plurality of fastening members 160 may be spaced apart from the first and second welding surfaces JS1c and JS2c.

According to example embodiments, each of the plurality of ribs 111cR, 112cR, and 113cR may include a plurality of receiving grooves for accommodating the cylindrical portion 160S. Each of the plurality of receiving grooves may include a screw thread receiving portion having a shape complementary to the screw thread 160T of the cylindrical portion 160S.

According to exemplary embodiments, by arranging the plurality of fastening members 160 in a zigzag manner, the housing 110c and the cover plate 150 are reliably fixed and the required number of fastening members 160 is reduced. can be saved. Accordingly, the energy density of the battery pack 100c can be improved.

(Embodiment 5)

10 is a bottom view of a battery pack according to example embodiments. In Figure 10, the cover plate 150 is omitted for a more complete understanding of the present invention.

FIG. 11 is a cross-sectional view taken along the cutting line 10I-10I' of FIG. 10.

10 and 11, the battery pack 100d includes a housing 110d, a plurality of battery devices 120, a center beam 131, a plurality of cross beams 133 (see FIG. 1), and a plurality of exhaust It may include devices 140, a cover plate 150, a plurality of fastening members 160, and a TIM 170. The battery pack 100d is the final form of a battery system installed in mobility, etc.

A plurality of battery devices 120, a center beam 131, a plurality of cross beams 133 (see FIG. 1), a plurality of exhaust devices 140, and a cover plate 150 are shown in FIGS. 1 to 3. Since they are substantially the same as those described above, duplicate descriptions thereof will be omitted.

A plurality of battery devices 120, a center beam 131, a plurality of cross beams 133 (see FIG. 1), a plurality of exhaust devices 140, and a cover plate 150 are shown in FIGS. 1 to 3. Since they are substantially the same as those described above, duplicate descriptions thereof will be omitted.

According to example embodiments, the housing 110d may provide a space for mounting a plurality of battery devices 120. The housing 110d includes a first plate 111d, a second plate 112d, a third plate 113d, a first side wall 114, a second side wall 115, a third side wall 116, and a fourth side wall. It may include (117). Since the first to fourth side walls 114, 115, 116, and 117 are substantially the same as those described with reference to FIGS. 1 to 3, duplicate description thereof will be omitted.

The first to third plates 111d, 112d, and 113d may form the plate portion 110dP. The first plate 111d may contact the second plate 112d, and the second plate 112d may contact the third plate 113d. The first plate 111d may be welded to the second plate 112c, and the second plate 112d may be welded to the third plate 113d. The plate portion 110dP is a first welding surface JS1d, which is the interface between the first plate 111d and the second plate 112d, and an interface between the second plate 112d and the third plate 113d. It may include a second welding surface (JS2d).

The first plate 111d may include a plurality of channels 111dCH and a plurality of ribs 111dR. The second plate 112d may include a plurality of channels 112dCH and a plurality of ribs 112dR. The third plate 113 may include a plurality of channels 113CH and a plurality of ribs 113dR. The shape, function, and arrangement of the plurality of channels (111dCH, 112dCH, 113dCH) and the plurality of ribs (111dR, 112dR, 113dR) are substantially the same as those described with reference to FIGS. 1 to 3, so a duplicate description thereof is provided. is omitted.

According to exemplary embodiments, the first to third plates 111, 112, and 113 do not include cavities. Accordingly, the mechanical strength of the housing 110d can be improved. Additionally, since the position of the plate portion 110dP where the plurality of fastening members 160 are coupled can be freely determined, the degree of freedom in designing the battery pack 100 can be improved.

According to example embodiments, the cover plate 150 may be fixed to the plate portion 110dP by a plurality of fastening members 160. According to example embodiments, the plurality of fastening members 160 may be arranged in a matrix when viewed from the bottom.

According to exemplary embodiments, the cylindrical portion 160S of each of the plurality of fastening members 160 may be coupled to any one of the first to third plates 111d, 112d, and 113d. According to exemplary embodiments, the cylindrical portion 160S of each of the plurality of fastening members 160 may be spaced apart from the first and second welding surfaces JS1d and JS2d.

According to example embodiments, each of the first to third plates 111d, 112d, and 113d may include a plurality of receiving grooves for accommodating the cylindrical portion 160S. Each of the plurality of receiving grooves may include a screw thread receiving portion having a shape complementary to the screw thread 160T of the cylindrical portion 160S.

(Example 6)

FIG. 12 shows a portion corresponding to FIG. 3. In FIG. 12, elements except for the cover plate 151 are the same as those in FIG. 3, so duplicate descriptions thereof will be omitted. The cover plate 151 of FIG. 12 is the battery pack 100 of FIG. 1, the battery pack 100a of FIG. 4, the battery pack 100b of FIG. 6, the battery pack 100c of FIG. 8, and the battery pack 100 of FIG. 10 described above. In the battery pack 100d, the cover plate 150 can be replaced.

Referring to FIG. 12, the cover plate 151 may include a bottom portion 151B and grooves 151G. The grooves 151G are parts for coupling the plurality of fastening members 160. The grooves 151G may be closer to the plate portion 111P than the bottom portion 151B. The head portion 160H of each of the plurality of fastening members 160 may contact the grooves 151G. The plurality of fastening members 160 may be spaced apart from the bottom portion 151B. The grooves 151G may extend according to the design of the position where the plurality of fastening members 160 are to be fastened, and may have various planar shapes such as line, cross, or grid shape. Due to the formation of the grooves 151G, the head portion 160H of each of the plurality of fastening members 160 is located above the bottom portion 151B, thereby improving the stability of the battery pack.

Above, the present invention has been described in more detail through drawings and examples. However, since the configurations described in the drawings or examples described in this specification are only one embodiment of the present invention and do not represent the entire technical idea of the present invention, at the time of filing this application, various equivalents and It should be understood that variations may exist.

100, 100a, 100b, 100c, 100d: Battery pack
110, 110a, 110b, 110c, 110d: housing
120: battery device, 131, 133: bulkhead, 140 exhaust device
150: cover plate, 160: fastening member

Claims (15)

A housing including a plate portion;
a plurality of battery devices disposed on the upper surface of the plate portion of the housing;
a cover plate disposed on the lower surface of the plate portion of the housing; and
Includes a plurality of fastening members for fixing the cover plate and the housing,
Each of the plurality of fastening members includes a head portion and a cylindrical portion (shank) having a smaller diameter than the head portion, and
A battery pack, wherein the head portion of each of the plurality of fastening members is in contact with the cover plate. According to paragraph 1,
The battery pack, wherein the cylindrical portion of each of the plurality of fastening members is in contact with the housing. According to paragraph 1,
The housing is configured to allow fluid to flow, and includes a plurality of channels extending along a first direction parallel to the upper surface of the plate portion, and
The battery pack, wherein the plurality of fastening members are interposed between the plurality of channels. According to paragraph 3,
The housing is interposed between the plurality of channels, extends along the first direction, and includes a plurality of ribs,
A battery pack, wherein the plurality of fastening members are coupled to the plurality of ribs. According to paragraph 4,
A battery pack, characterized in that the width of each of the plurality of ribs is in the range of 5 mm to 20 mm. According to paragraph 4,
The battery pack, wherein the housing includes a plurality of cavities, which are empty spaces interposed between the plurality of channels and the plurality of ribs and extending along the first direction. According to paragraph 3,
The housing includes a plurality of first ribs and a plurality of second ribs interposed between the plurality of channels and extending along the first direction,
Each of the plurality of fastening members is coupled to a corresponding one of the plurality of first ribs, and
A battery pack, wherein each of the plurality of fastening members is spaced apart from the plurality of second ribs. In clause 7,
A battery pack, wherein a width of each of the plurality of first ribs in a second direction perpendicular to the first direction is equal to a width of each of the second ribs in the second direction. In clause 7,
A battery pack, wherein a width of each of the plurality of first ribs in a second direction perpendicular to the first direction is different from a width of each of the second ribs in the second direction. In clause 7,
A battery pack, wherein a width of each of the plurality of first ribs in a second direction perpendicular to the first direction is greater than a width of each of the plurality of second ribs in the second direction. According to paragraph 1,
The housing extends along a first direction and includes first and second plates welded together, and
A battery pack, wherein each of the plurality of fastening members is spaced apart from a welded surface of the first plate and the second plate. According to paragraph 1,
A battery pack, wherein the plurality of fastening members are arranged in a matrix. According to paragraph 1,
A battery pack, wherein the plurality of fastening members are arranged in a zigzag pattern. According to paragraph 1,
The battery pack, wherein the housing includes a plurality of thread receiving portions that contact the threads of the plurality of fastening members. According to clause 14,
The housing is configured to allow fluid to flow, and includes a plurality of channels extending along a first direction parallel to the upper surface of the plate portion, and
A battery pack, wherein the plurality of threaded receiving portions are at the same level as the plurality of channels.

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