Battery pack

Abstract

Embodiments provide a battery pack. The battery pack includes a battery pack housing including a bottom plate and a cover; a plurality of battery cell assemblies housed in the battery pack housing and including a plurality of battery cells and a plurality of spacers located between the plurality of battery cells; and a coolant at least partially filling the battery pack housing, wherein each of the plurality of spacers includes a lower flange, an upper flange, and a main body located between the lower flange and the upper flange, the main body including a plurality of cooling channels extending in a first direction parallel to a mounting surface of the bottom plate, and each of the lower flange and the upper flange has a width in a second direction perpendicular to the first direction and parallel to the mounting surface that is different from a width of the main body in the second direction.

Description

Technical Field

[0001] This disclosure relates to a battery pack. This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0130736, filed on September 26, 2024, the entire contents of which are incorporated herein by reference. Background Technology

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. They are widely used as a power source for various types of wireless devices, such as mobile phones, laptops, and cordless vacuum cleaners. Recently, as the manufacturing cost per unit capacity of secondary batteries has significantly decreased due to increased energy density and economies of scale, and as the driving range of battery electric vehicles (BEVs) has increased to the same level as that of gasoline-powered vehicles, the primary use of secondary batteries has shifted from mobile devices to mobility.

[0003] The technological development trend for secondary batteries used in mobility services is towards increased energy density and safety. The safety of secondary batteries for mobility services is directly related to passenger lives and is therefore of paramount importance. The safety of secondary batteries can be achieved through mechanical robustness, reliable electrical insulation, and delays in heat transfer during thermal runaway events. Summary of the Invention

[0004] Technical issues

[0005] This disclosure aims to provide a battery pack with improved safety.

[0006] Technical solution

[0007] Embodiments of this disclosure provide a battery pack. The battery pack includes: a battery pack housing including a base plate and a cover; a plurality of battery cell assemblies disposed within the battery pack housing and including a plurality of battery cells and a plurality of spacers located between the plurality of battery cells; and a coolant that at least partially fills the battery pack housing. Each of the plurality of spacers includes a lower flange, an upper flange, and a body located between the lower flange and the upper flange. The body includes a plurality of cooling channels extending along a first direction parallel to a mounting surface of the base plate, and the width of each of the lower flange and the upper flange in a second direction perpendicular to the first direction and parallel to the mounting surface is different from the width of the body in the second direction.

[0008] Each of the multiple battery cell assemblies may also include multiple pads located between the multiple battery cells.

[0009] Each of the multiple spacers can be spaced apart from each of the multiple pads.

[0010] Each of the multiple pads can make contact with a corresponding one of the multiple battery cells.

[0011] Each of the multiple spacers can make contact with a corresponding one of the multiple battery cells.

[0012] The body may include a plurality of slits extending along the first direction.

[0013] Each of the multiple slits can be connected to a corresponding one of the multiple cooling channels.

[0014] The length of each of the multiple slits in the first direction may be different from the length of each of the multiple cooling channels in the first direction.

[0015] The length of each of the multiple slits in the first direction can be less than the length of each of the multiple cooling channels in the first direction.

[0016] The coolant can fill multiple cooling channels.

[0017] The coolant can fill multiple slits.

[0018] The height of each of the multiple spacers in a third direction perpendicular to the first and second directions may differ from the height of each of the multiple battery cells in the third direction.

[0019] The height of each of the multiple spacers in a third direction perpendicular to the first and second directions can be greater than the height of each of the multiple battery cells in the third direction.

[0020] The height of the main body in a third direction perpendicular to the first and second directions can be equal to the height of each of the multiple battery cells in the third direction.

[0021] The width of each of the upper and lower flanges in the second direction may be greater than the width of the body in the second direction.

[0022] Beneficial effects

[0023] According to embodiments of this disclosure, each cell assembly of the battery pack can be cooled by an immersion method. Therefore, the cooling efficiency and safety of the battery pack can be improved.

[0024] The effects achievable by the embodiments of this disclosure are not limited to those described above, and those skilled in the art to which the embodiments of this disclosure pertain will clearly derive and understand other effects not described herein based on the following description. In other words, those skilled in the art can derive unintended effects from the embodiments of this disclosure when implementing them. Attached Figure Description

[0025] Figure 1 This is a plan view of the battery pack according to an embodiment.

[0026] Figure 2 It is along Figure 1 The cross-sectional view taken from line 1A-1A'.

[0027] Figure 3 It is along Figure 1 The cross-sectional view taken from line 1B-1B'.

[0028] Figure 4 It is along Figure 2 The cross-sectional view taken from line 2A-2A'.

[0029] Figure 5 It is along Figure 2 The cross-sectional view taken from line 2B-2B'.

[0030] Figure 6 It is along Figure 2 The cross-sectional view taken from line 2C-2C'.

[0031] Figures 7 to 9 This is a cross-sectional view of a battery pack according to other embodiments. Detailed Implementation

[0032] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Before describing the embodiments of the present disclosure, the terms or expressions used in this specification and claims should not be construed as limited to terms or expressions as commonly understood or defined in common dictionaries, but should be understood based on the principle that the inventors of this application may appropriately define the terms or expressions to best interpret the present disclosure according to the meanings and concepts corresponding to the present disclosure.

[0033] Therefore, the configurations illustrated in the embodiments and accompanying drawings described herein are merely examples of this disclosure and do not reflect all the technical concepts of this disclosure. It should be understood that, as of the filing date of this application, various equivalents and variations may exist that can replace these configurations.

[0034] When it is determined that well-known configurations or functions related to the description of this disclosure obscure the subject matter of this disclosure due to unnecessary details, these configurations or functions will not be described in detail.

[0035] Because embodiments of this disclosure are provided to illustrate the disclosure more fully to those skilled in the art, the shapes, dimensions, etc., of the components shown in the drawings may be shown enlarged, omitted, or schematically for clarity. Therefore, it should not be construed that the dimensions or proportions of the components fully reflect their actual dimensions or proportions.

[0036] (First embodiment and second embodiment)

[0037] Figure 1 This is a plan view of the battery pack 100 according to an embodiment.

[0038] Figure 2 It is along Figure 1 The cross-sectional view taken from line 1A-1A'.

[0039] Figure 3 It is along Figure 1 The cross-sectional view taken from line 1B-1B'.

[0040] Figure 4 It is along Figure 2 The cross-sectional view taken from line 2A-2A'.

[0041] Figure 5 It is along Figure 2 The cross-sectional view taken from line 2B-2B'.

[0042] Figure 6 It is along Figure 2 The cross-sectional view taken from line 2C-2C'.

[0043] Reference Figures 1 to 6 The battery pack 100 may include a battery pack housing 110, a plurality of battery cell assemblies 120, adhesive layers 131 and 133, and a coolant 140.

[0044] The battery pack housing 110 provides space for mounting the battery cell assembly 120 therein. The battery pack housing 110 may include a base plate 111, side walls (112, 113, 114 and 115), and a cover 116.

[0045] Two directions substantially parallel to the mounting surface 111M of the base plate 111 will be defined hereinafter as the X-axis direction and the Y-axis direction. The mounting surface 111M of the base plate 111 can face multiple battery cell modules 120. The direction substantially perpendicular to the mounting surface 111M of the base plate 111 will be defined hereinafter as the Z-axis direction. The X-axis direction, Y-axis direction, and Z-axis direction can be substantially perpendicular to each other. Unless otherwise stated, the definitions of directions will apply to the following figures.

[0046] Side walls 112, 113, 114, and 115 can be attached to the base plate 111. Side walls 112, 113, 114, and 115 can be welded to the base plate 111. Each of side walls 112, 113, 114, and 115 can be perpendicular to the base plate 111. The cover 116 can be plate-shaped. The cover 116 can be attached to the side walls 112, 113, 114, and 115. The cover 116 can be welded to the side walls 112, 113, 114, and 115.

[0047] Sidewalls 112 and 113 may be substantially perpendicular to the Y-axis direction. Multiple battery cell assemblies 120 may be disposed between sidewalls 112 and 113. Sidewalls 114 and 115 may be substantially perpendicular to the X-axis direction. Multiple battery cell assemblies 120 may be disposed between sidewalls 114 and 115. Sidewalls 112, 113, 114, and 115 may horizontally surround the multiple battery cell assemblies 120.

[0048] Multiple battery cell assemblies 120 may be mounted on a base plate 111. The battery pack 100 may be of a module-less type, and each of the multiple battery cell assemblies 120 may not include a module frame. As another example, the battery pack 100 may be of a module type, and each of the multiple battery cell assemblies 120 may include a module frame.

[0049] Multiple battery cell modules 120 can be arranged in the X-axis and Y-axis directions. Figure 1 In this configuration, three battery cell assemblies 120 are arranged along the X-axis, and two are arranged along the Y-axis. Therefore, the multiple battery cell assemblies 120 can be arranged in a 3x2 array. Based on the above description, those skilled in the art will be able to readily deduce that multiple battery cell assemblies 120 can be arranged in an M×N array (where M and N are each integers greater than 2).

[0050] Each of the plurality of battery cell assemblies 120 may include a plurality of battery cells 121, a plurality of pads 122, a plurality of spacers 123, a first integrated circuit assembly 124, a second integrated circuit assembly 125, and a side plate 126. Each of the plurality of battery cell assemblies 120 may also include a flexible flat cable (FFC) assembly connecting the first integrated circuit assembly 124 and the second integrated circuit assembly 125 to each other.

[0051] Each of the plurality of battery cells 121 may be a lithium-ion battery. Each of the plurality of battery cells 121 includes an electrode assembly, an electrolyte, and a casing. Each of the plurality of battery cells may be a cylindrical battery cell, a prismatic battery cell, or a pouch battery cell. The electrode assembly of a cylindrical battery cell is embedded in a cylindrical metal can. The electrode assembly of a prismatic battery cell is embedded in a prismatic metal can. The electrode assembly of a pouch battery cell is embedded in a pouch casing comprising an aluminum laminate.

[0052] An electrode assembly may include a positive electrode, a negative electrode, and a separator between the positive and negative electrodes. The electrode assembly may be a wound electrode assembly or a stacked electrode assembly. A wound electrode assembly may include a structure in which a positive electrode, a negative electrode, and a separator between the positive and negative electrodes are wound together. A stacked electrode assembly may include multiple positive electrodes and multiple negative electrodes stacked sequentially, and multiple separators inserted between them.

[0053] Multiple battery cells 121 can be arranged along the Y-axis. Multiple battery cells 121 can form multiple groups. Each of the multiple groups can include more than one battery cell 121 connected in parallel. Multiple groups can be connected in series with each other. The number of groups connected in series and the number of battery cells 121 connected in parallel can be determined based on the voltage and current to be output from each of the multiple battery cell assemblies 120.

[0054] Multiple battery cells 121 can be inserted between multiple pads 122. The multiple pads 122 can be arranged along the Y-axis. Each of the multiple pads 122 can contact a corresponding one of the multiple battery cells 121. The multiple pads 122 can include a compressible material such as polyurethane, and thus can absorb the expansion of the multiple battery cells 121.

[0055] Multiple spacers 123 may be arranged along the Y-axis. Multiple spacers 123 may be inserted between multiple battery cells 121. Each of the multiple spacers 123 may contact a corresponding one of the multiple battery cells 121. Each of the multiple spacers 123 may comprise, but is not limited to, a material with high rigidity, such as plastic or aluminum. The cross-section of each of the multiple spacers 123 may have a dog-bone shape, an H-shape, or a dumbbell shape.

[0056] Between two adjacent battery cells 121, there may be one or more spacers 123 from a plurality of pads 122. Between two adjacent pads 122, there may be two of the battery cells 121 and one of the spacers 123. Between two adjacent spacers 123, there may be two of the battery cells 121 and one of the pads 122.

[0057] Each of the plurality of spacers 123 may be spaced apart from each of the plurality of pads 122. Each of the plurality of spacers 123 may not be in contact with the plurality of pads 122. A first surface (e.g., a surface substantially perpendicular to the Y-axis direction) of each of the plurality of battery cells 121 may be in contact with one of the plurality of spacers 123, and a second surface (e.g., a surface substantially perpendicular to the Y-axis direction and opposite to the first surface) of each of the plurality of battery cells 121 may be in contact with one of the plurality of pads 122.

[0058] The height of each of the plurality of spacers 123 in the Z-axis direction may differ from the height of each of the plurality of battery cells 121 in the Z-axis direction. The height of each of the plurality of spacers 123 in the Z-axis direction may be greater than the height of each of the plurality of battery cells 121 in the Z-axis direction. Therefore, the lower part of each of the plurality of battery cells 121 is spaced apart from the base plate 111, and the upper part of each of the plurality of battery cells 121 is spaced apart from the cover 116, so that the upper and lower parts of each of the plurality of battery cells 121 can be cooled by the coolant 140.

[0059] The height of each of the plurality of spacers 123 in the Z-axis direction may be different from the height of each of the plurality of pads 122 in the Z-axis direction. The height of each of the plurality of spacers 123 in the Z-axis direction may be greater than the height of each of the plurality of pads 122 in the Z-axis direction.

[0060] Each of the plurality of spacers 123 may include a lower flange 123L, an upper flange 123U, and a body 123B. The body 123B may be located between the lower flange 123L and the upper flange 123U. The body 123B may be connected to the lower flange 123L and the upper flange 123U.

[0061] The width of the lower flange 123L in the Y-axis direction may differ from the width of the main body 123B in the Y-axis direction. The width of the lower flange 123L in the Y-axis direction may be greater than the width of the main body 123B in the Y-axis direction.

[0062] The width of the upper flange 123U in the Y-axis direction may differ from the width of the main body 123B in the Y-axis direction. The width of the upper flange 123U in the Y-axis direction may be greater than the width of the main body 123B in the Y-axis direction.

[0063] The width of the lower flange 123L protruding relative to the body 123B in the Y-axis direction may be smaller than the width of each of the plurality of battery cells 121 in the Y-axis direction. Therefore, the lower flange 123L may partially overlap with a corresponding one of the plurality of battery cells 121 in the Z-axis direction. The lower portion of each of the plurality of battery cells 121 may be at least partially exposed and not covered by the lower flange 123L.

[0064] The width of the upper flange 123U protruding relative to the body 123B in the Y-axis direction may be smaller than the width of each of the plurality of battery cells 121 in the Y-axis direction. Therefore, the upper flange 123U may partially overlap with a corresponding one of the plurality of battery cells 121 in the Z-axis direction. The upper part of each of the plurality of battery cells 121 may be at least partially exposed and not covered by the upper flange 123U.

[0065] The height of the main body 123B in the Z-axis direction can be substantially the same as the height of each of the plurality of battery cells 121 in the Z-axis direction. The height of the main body 123B in the Z-axis direction can be substantially the same as the height of each of the plurality of pads 122 in the Z-axis direction.

[0066] Each of the plurality of spacers 123 may include: a first groove 123G1 defined by a first surface 123F1 of a lower flange 123L, an upper flange 123U, and a body 123B, and a second groove 123G2 defined by a second surface 123F2 of a lower flange 123L, an upper flange 123U, and a body 123B. Each of the battery cells 121 may be partially inserted into one of the corresponding first groove 123G1 and second groove 123G2 of the plurality of spacers 123.

[0067] The main body 123B may include a plurality of cooling channels 123CH. Each of the plurality of cooling channels 123CH may extend along the X-axis direction. Each of the plurality of cooling channels 123CH may penetrate the main body 123B along the X-axis direction. The length of each of the plurality of cooling channels 123CH along the X-axis direction may be substantially the same as the length of the main body 123B along the X-axis direction.

[0068] The width of each of the multiple cooling channels 123CH in the Y-axis direction may be less than the width of the main body 123B in the Y-axis direction. The height of each of the multiple cooling channels 123CH in the Z-axis direction may be less than the height of the main body 123B in the Z-axis direction. The multiple cooling channels 123CH may be arranged along the Z-axis direction. The multiple cooling channels 123CH may be spaced apart from each other along the Z-axis direction.

[0069] The main body 123B may also include a plurality of first slits 123S1 and a plurality of second slits 123S2. A plurality of cooling channels 123CH may be located between the plurality of first slits 123S1 and the plurality of second slits 123S2. Each of the plurality of first slits 123S1 may be spaced apart from each of the plurality of second slits 123S2 along the Y-axis direction.

[0070] The lengths of the plurality of first slits 123S1 and the plurality of second slits 123S2 in the X-axis direction may differ from the lengths of the plurality of cooling channels 123CH in the X-axis direction. The lengths of the plurality of first slits 123S1 and the plurality of second slits 123S2 in the X-axis direction may be less than the lengths of the plurality of cooling channels 123CH in the X-axis direction.

[0071] In this example, the heights of the plurality of first slits 123S1 and the plurality of second slits 123S2 in the Z-axis direction are shown to be substantially the same as the heights of the plurality of cooling channels 123CH in the Z-axis direction, but this is only an example and should not be construed as limiting the technical ideas of this disclosure in any sense.

[0072] The heights of the plurality of first slits 123S1 and the plurality of second slits 123S2 in the Z-axis direction may differ from the heights of the plurality of cooling channels 123CH in the Z-axis direction. The heights of the plurality of first slits 123S1 and the plurality of second slits 123S2 in the Z-axis direction may be greater than the heights of the plurality of cooling channels 123CH in the Z-axis direction. The heights of the plurality of first slits 123S1 and the plurality of second slits 123S2 in the Z-axis direction may be less than the heights of the plurality of cooling channels 123CH in the Z-axis direction.

[0073] Each of the plurality of first slits 123S1 can connect a first groove 123G1 to a corresponding one of the plurality of cooling channels 123CH. Each of the plurality of second slits 123S2 can connect a second groove 123G2 to a corresponding one of the plurality of cooling channels 123CH. Therefore, coolant 140 can fill the plurality of cooling channels 123CH, the plurality of first slits 123S1, and the plurality of second slits 123S2. Coolant 140 can contact the plurality of battery cells 121 through the plurality of first slits 123S1 and the plurality of second slits 123S2, and therefore, the plurality of battery cells 121 can be cooled by coolant 140.

[0074] Multiple battery cells 121 may be located between a first integrated circuit assembly 124 and a second integrated circuit assembly 125. The first integrated circuit assembly 124 may be spaced apart from the second integrated circuit assembly 125 in the X-axis direction, wherein the multiple battery cells 121 are located between the first integrated circuit assembly 124 and the second integrated circuit assembly 125.

[0075] The first integrated circuit assembly 124 may include a first insulating frame 124F, an integrated circuit, a busbar, a sensing board, a sensing strip, a temperature sensor, wires, and an insulating cover.

[0076] The first insulating frame 124F may contain insulating material such as plastic. The first insulating frame 124F may cover the front side of multiple battery cells 121. The first insulating frame 124F may support integrated circuits, busbars, sensing boards, sensing strips, temperature sensors, and wires.

[0077] The busbar can be electrically connected to the positive leads of one or more battery cells 121 in the first group and the negative leads of one or more battery cells 121 in the last group. The busbar can be soldered to the positive leads of one or more battery cells 121 in the first group and the negative leads of one or more battery cells 121 in the last group. The voltage obtained from the multiple battery cells 121 in each of the multiple battery cell assemblies 120 can be output through the busbar. The busbar can be fixed to the first insulating frame 124F.

[0078] An integrated circuit can be mounted on the first insulating frame 124F. Positive and negative leads soldered together can form nodes within the multiple cell assembly 120. The integrated circuit can be configured to measure the voltage of the nodes.

[0079] The sensing strip may contain conductive material. The sensing strip may be rod-shaped. The sensing strip may be electrically connected to a busbar. The sensing strip may be integrated into a busbar. The voltage of the busbar can be measured using the sensing strip.

[0080] Each sensing plate may be in the form of a patch or a pad. The sensing plate may contain conductive material. The sensing plate may be electrically connected to corresponding leads in the positive and negative leads of multiple battery cells 121.

[0081] Each sensing board can be connected to an integrated circuit. The voltage of multiple nodes in each of the multiple battery cell assemblies 120 can be measured through the sensing boards.

[0082] The temperature sensor can be configured to measure the temperature at multiple points on multiple battery cell modules 120. The temperature sensor can be arranged along the X-axis, Y-axis, and Z-axis, thus allowing measurement of the temperature distribution within the multiple battery cell modules 120.

[0083] The insulating cover may contain an insulating material such as plastic. The insulating cover may be press-fitted into the first insulating frame 124F. The insulating cover may cover the integrated circuit, busbar, sensing board, sensing strip, and temperature sensor, thus protecting the electrical components of the first integrated circuit assembly 124.

[0084] The second integrated circuit assembly 125 may include a second insulating frame 125F, an integrated circuit, a sensing board, a temperature sensor, wires, and an insulating cover. The second integrated circuit assembly 125 is substantially the same as the first integrated circuit assembly 124, except that the second integrated circuit assembly 125 does not include a busbar and a sensing bar.

[0085] The first insulating frame 124F may include a plurality of cooling channels 124CH connected to a plurality of cooling channels 123F. The second insulating frame 125F may include a plurality of cooling channels 125CH connected to a plurality of cooling channels 123F.

[0086] Each of the side plates 126 may be flat. Each of the side plates 126 may extend along the X-axis. The length of each of the side plates 126 in the X-axis direction may be greater than or equal to the length of each of the plurality of battery cells 121 in the X-axis direction.

[0087] Each of the side plates 126 may be spaced apart from each other along the Y-axis. Multiple battery cells 121 may be located between the side plates 126. The side plates 126 may be attached to the outermost pad 122 in the Y-axis direction.

[0088] An adhesive layer 131 may be present between each of the plurality of battery cell assemblies 120 and the base plate 111. The plurality of battery cell assemblies 120 may be secured to the base plate 111 via the adhesive layer 131.

[0089] An adhesive layer 133 may be present between each of the plurality of battery cell assemblies 120 and the cover 116. The plurality of battery cell assemblies 120 may be secured to the cover 116 via the adhesive layer 133.

[0090] Coolant 140 may at least partially fill the internal space of the battery pack housing 110. Coolant 140 may have high thermal conductivity and insulating properties. Coolant 140 may include at least one of mineral oil, synthetic oil, silicone oil, and fluorinated fluid. Coolant 140 may include deionized water.

[0091] The battery pack 100 may further include: an inlet configured to introduce coolant 140 into the battery pack housing 110; and an outlet configured to discharge coolant 140 from the battery pack housing 110. The inlet and outlet may be connected to a coolant circulation system.

[0092] The battery pack 100 may also include a battery management system (BMS). The BMS can be configured to monitor, balance, and control the battery pack 100. Monitoring of the battery pack 100 may include measuring the voltage and current at certain nodes in the plurality of individual cell assemblies 120 and measuring the temperature at designated locations within the battery pack 100. The battery pack 100 may include measuring devices for measuring the voltage, current, and temperature as described above.

[0093] Balancing the battery pack 100 is an operation to reduce deviations between the multiple battery cell assemblies 120. Control of the battery pack 100 includes prevention of overcharging, over-discharging, and overcurrent. Through monitoring, balancing, and control, the battery pack 100 can operate under optimal conditions, thereby preventing a shortened lifespan for each of the multiple battery cell assemblies 120.

[0094] The battery pack 100 may also include additional electronic components, such as a power relay assembly (PRA) and a safety plug. The PRA can be configured to supply power from the high-voltage battery to an external load (e.g., the vehicle's motor) or to disconnect the power supply. In the event of an abnormal voltage, such as a voltage surge, the PRA can disconnect the power supply to the external load (e.g., the vehicle's motor) to protect the multiple battery cell assemblies 120 and the external load.

[0095] The battery pack 100 may further include a plurality of busbars configured to electrically connect a plurality of battery cell assemblies 120. The plurality of battery cell assemblies 120 may be connected in series via the plurality of busbars. Therefore, the battery pack 100 may be configured to output high voltage to an external load (e.g., a vehicle motor).

[0096] (Third embodiment)

[0097] Figures 7 to 9 This is a cross-sectional view of the battery pack 100' according to another embodiment. More specifically, Figure 7 It shows the relationship with Figure 3 The corresponding part, Figure 8 It shows the relationship with Figure 4 The corresponding part, and Figure 9 It shows the relationship with Figure 5 The corresponding part.

[0098] Reference Figures 7 to 9 Apart from the individual battery cell assembly 120', the battery pack 100' is the same as the one mentioned above. Figures 1 to 6 The battery pack 100 described is substantially the same. The battery cell assembly 120' may include a plurality of battery cells 121, a plurality of pads 122, a plurality of spacers 123', a first integrated circuit assembly 124, a second integrated circuit assembly 125, and a side plate 126.

[0099] Multiple battery cells 121, multiple pads 122, a first integrated circuit assembly 124, a second integrated circuit assembly 125, and a side plate 126 are referenced above. Figures 1 to 6 The descriptions are essentially the same, so redundant descriptions are omitted here.

[0100] Each of the plurality of spacers 123' may include a first opening 123O1 and a second opening 123O2. The first opening 123O1 may connect the plurality of cooling channels 123CH and the first recess 123G1. The second opening 123O2 may connect the plurality of cooling channels 123CH and the second recess 123G2. The first opening 123O1 may replace a plurality of first slits 123S1 (see...). Figure 4 Furthermore, the second opening 123O2 can replace multiple second slits 123S2 (see...). Figure 4 ).

[0101] According to an embodiment, by providing a plurality of spacers 123' including a first opening 123O1 and a second opening 123O2 connected to a plurality of cooling channels 123CH, the contact area between the coolant 140 and the plurality of battery cells 121 can be increased, and the cooling efficiency of the battery pack 100' can be improved.

[0102] The present disclosure has been described in more detail above with reference to the accompanying drawings and embodiments. However, the configurations shown in the drawings or the embodiments described in this specification are merely examples of the present disclosure and do not reflect the full technical concept of the present disclosure. Therefore, it should be understood that, as of the filing date of this application, various equivalents and variations may exist that can replace these configurations.

Claims

1. A battery pack, comprising: Battery pack housing, including base plate and cover; Multiple battery cell assemblies are disposed in the battery pack housing and include multiple battery cells and multiple spacers located between the multiple battery cells; as well as Coolant, at least partially filling the battery pack casing, Each of the plurality of spacers includes a lower flange, an upper flange, and a main body located between the lower flange and the upper flange. The main body includes a plurality of cooling channels extending along a first direction parallel to the mounting surface of the base plate, and The width of each of the lower flange and the upper flange in the second direction is different from the width of the body in the second direction, wherein the second direction is perpendicular to the first direction and parallel to the mounting surface.

2. The battery pack according to claim 1, wherein, Each of the plurality of battery cell assemblies also includes a plurality of pads located between the plurality of battery cells.

3. The battery pack according to claim 2, wherein, Each of the plurality of spacers is spaced apart from each of the plurality of pads.

4. The battery pack according to claim 2, wherein, Each of the plurality of pads is in contact with a corresponding one of the plurality of battery cells.

5. The battery pack according to claim 1, wherein, Each of the plurality of spacers is in contact with a corresponding one of the plurality of battery cells.

6. The battery pack according to claim 1, wherein, The body includes a plurality of slits extending along the first direction.

7. The battery pack according to claim 6, wherein, Each of the plurality of slits is connected to a corresponding one of the plurality of cooling channels.

8. The battery pack according to claim 6, wherein, The length of each of the plurality of slits in the first direction is different from the length of each of the plurality of cooling channels in the first direction.

9. The battery pack according to claim 6, wherein, The length of each of the plurality of slits in the first direction is less than the length of each of the plurality of cooling channels in the first direction.

10. The battery pack according to claim 6, wherein, The coolant fills the plurality of cooling channels.

11. The battery pack according to claim 6, wherein, The coolant fills the plurality of slits.

12. The battery pack according to claim 1, wherein, The height of each of the plurality of spacers in the third direction is different from the height of each of the plurality of battery cells in the third direction, wherein the third direction is perpendicular to the first direction and the second direction.

13. The battery pack according to claim 1, wherein, The height of each of the plurality of spacers in the third direction is greater than the height of each of the plurality of battery cells in the third direction, wherein the third direction is perpendicular to the first direction and the second direction.

14. The battery pack according to claim 1, wherein, The height of the main body in the third direction is equal to the height of each of the plurality of battery cells in the third direction, wherein the third direction is perpendicular to the first direction and the second direction.

15. The battery pack according to claim 1, wherein, The width of each of the upper flange and the lower flange in the second direction is greater than the width of the body in the second direction.

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