Battery pack

Abstract

The present application relates to a battery pack, which includes a box body and a battery module. The battery module is disposed inside the box body. The battery module includes a plurality of battery cells connected in a fitting manner. Each battery cell includes a housing, a battery cell group, a first top cover assembly, a second top cover assembly, and a voltage acquisition structure. The battery cell group includes at least two single battery cells connected in series. The first top cover assembly and the second top cover assembly are respectively electrically connected to the single battery cells. The voltage acquisition structure includes at least two acquisition wire harnesses. One ends of the at least two acquisition wire harnesses are all connected to the first top cover assembly, and the other ends of the at least two acquisition wire harnesses are sequentially connected to at least two single battery cells to acquire the voltage information of each single battery cell. This battery pack integrates the voltage information acquisition structure on the single battery cell, simplifies the electrical structure of the battery pack, improves the acquisition accuracy of the voltage information at the same time, and can reduce the process complexity of the battery system.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a battery pack. Background Art

[0002] During the use of a battery, the quality of its operating state directly affects the performance of the electrical device. Therefore, during the operation of the battery, a battery management system is required to monitor the voltage of the battery in order to timely monitor the operating state of the battery.

[0003] However, currently, the electrical structures of most battery packs are relatively complex and the space utilization rate is low. Summary of the Invention

[0004] In view of this, embodiments of the present application provide a battery pack to solve at least one problem in the background art.

[0005] In a first aspect, embodiments of the present application provide a battery pack, including:

[0006] A box body;

[0007] A battery module, which is arranged in the box body, and the battery module includes a plurality of battery units connected in a fitting manner;

[0008] Wherein, the battery unit includes:

[0009] A housing, provided with opposite first and second openings, and there is a receiving cavity between the first opening and the second opening;

[0010] A battery cell group, located in the receiving cavity, the battery cell group includes at least two single battery cells, and the single battery cells are connected in series;

[0011] A first top cover assembly, connected to the first opening of the housing and electrically connected to the single battery cells;

[0012] A second top cover assembly, connected to the second opening of the housing and electrically connected to the single battery cells;

[0013] A voltage acquisition structure, including at least two acquisition wire harnesses, one ends of at least two of the acquisition wire harnesses are all connected to the first top cover assembly, and the other ends of at least two of the acquisition wire harnesses are sequentially connected to at least two of the single battery cells to acquire the voltage information of each single battery cell.

[0014] Combined with the first aspect of the present application, in an optional implementation manner, the acquisition wire harness is located in the receiving cavity and outside the single battery cells.

[0015] In combination with the first aspect of the present application, in an alternative embodiment, the acquisition wire harness includes a bent portion and an extension portion. The bent portion is connected to the end of the extension portion, and the extension portion extends along the axial direction of the single cell.

[0016] In combination with the first aspect of the present application, in an alternative embodiment, the first top cover assembly and / or the second top cover assembly are provided with insertion portions, and the end of the bent portion of the acquisition wire harness is inserted into the insertion portion.

[0017] In combination with the first aspect of the present application, in an alternative embodiment, the insertion portion is a pin. The pin is embedded in the first top cover assembly and / or the second top cover assembly, and the two ends of the pin protrude from the first top cover assembly and / or the second top cover assembly.

[0018] In combination with the first aspect of the present application, in an alternative embodiment, the accommodation cavity accommodating the battery cell group is filled with a filler, and the filler is a thermal conductive adhesive, a structural adhesive or a thermal conductive structural adhesive.

[0019] In combination with the first aspect of the present application, in an alternative embodiment, the single cell is composed of a first separator, a positive electrode sheet, a second separator and a negative electrode sheet, and the first separator, the positive electrode sheet, the second separator and the negative electrode sheet are stacked in sequence.

[0020] In combination with the first aspect of the present application, in an alternative embodiment, the first top cover assembly includes:

[0021] A first top cover plate, connected to the first opening of the housing;

[0022] A first pole column, connected to the first top cover plate;

[0023] A first insulating member, connected between the first pole column and the first top cover plate;

[0024] A first adapter plate, one end of which is connected to the side of the first top cover plate close to the single cell, and the other end is connected to the positive electrode tab or the negative electrode tab of the single cell adjacent to the first top cover plate.

[0025] In combination with the first aspect of the present application, in an alternative embodiment, the box body is provided with a liquid cooling flow channel. The outer surface of the liquid cooling flow channel is attached to the outer surface of the housing, and the outer surface of the liquid cooling flow channel matches the shapes of the outer surfaces of a plurality of the housings.

[0026] In combination with the first aspect of the present application, in an alternative embodiment, the battery unit includes:

[0027] The first battery cell, a plurality of the first battery cells are connected in a first direction to form a first battery core group. The first battery cell has a first side face facing each other in the first direction, and adjacent first battery cells are attached by the first side face. The first battery cell also has a second side face and a third side face facing each other. The first direction is perpendicular to the axial direction of the housing.

[0028] The second battery cell, a plurality of the second battery cells are connected in the first direction to form a second battery core group. The second battery cell has a fourth side face facing each other in the first direction, and adjacent second battery cells are attached by the fourth side face. The second battery cell also has a fifth side face and a sixth side face facing each other. In a second direction, the second side face is attached to the fifth side face, and the third side face is attached to the sixth side face. The second direction is perpendicular to the first direction.

[0029] The battery pack provided by the embodiment of the present application integrates the voltage information acquisition structure on the single battery cell, simplifies the electrical structure of the battery pack, and at the same time improves the acquisition accuracy of the voltage information. In addition, a plurality of single battery cells are connected in series and placed in the housing, which can reduce the process complexity of the battery system, effectively reduce the connecting parts, save space and improve the volume utilization rate.

[0030] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0031] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0032] Figure 1 is a schematic exploded view of the overall structure of the battery pack provided by the embodiment of the present application;

[0033] Figure 2 is a schematic exploded view of the structure of the battery cell in the battery pack provided by the embodiment of the present application;

[0034] Figure 3 is a schematic diagram of the first top cover assembly and multiple acquisition wire harnesses in the battery pack provided by the embodiment of the present application;

[0035] Figure 4 is a schematic diagram of the internal structure of the battery cell in the battery pack provided by the embodiment of the present application;

[0036] Figure 5 is Figure 4 an enlarged view of part A in

[0037] Figure 6 is Figure 4 an enlarged view of part C in

[0038] Figure 7 a schematic cross-sectional view of a single battery cell in the battery pack provided by an embodiment of the present application;

[0039] Figure 8 a partial structural schematic diagram of a box body and a housing in the battery pack provided by an embodiment of the present application;

[0040] Figure 9 a partial structural exploded schematic diagram of a bottom plate and a first liquid cooling channel on the bottom plate in the battery pack provided by an embodiment of the present application;

[0041] Figure 10 is Figure 9 an enlarged view of part B in

[0042] Reference numerals:

[0043] 100, battery pack;

[0044] 10, box body; 1a, liquid cooling channel; 11a, first liquid cooling channel; 12a, second liquid cooling channel; 1a1, first channel; 1a2, first plugging member; 1a21, water inlet; 1a3, second plugging member; 1a31, water outlet; 1a32, triangular plate; 1a33, third channel; 110, bottom plate; 120, frame; 130, upper cover;

[0045] 20, battery module; 210, battery unit; 211, housing; 2111, first opening; 2112, second opening;

[0046] 212, battery cell group; 2121, single battery cell; 212a, first single battery cell; 212b, second single battery cell; 212c, third single battery cell; 212d, fourth single battery cell; 212e, fifth single battery cell; 212f, sixth single battery cell; 2122, positive electrode tab;

[0047] 213, first top cover assembly; 213a, plugging part; 2131, pin; 2132, first top cover plate; 2133, first pole; 2134, first insulating part; 2135, first adapter plate;

[0048] 214, second top cover assembly; 2141, second top cover plate; 2142, second pole; 2143, second insulating part; 2144, second adapter plate;

[0049] 215. Voltage acquisition structure; 2151. Acquisition wire harness; 2152. Bending part; 2153. Extension part; 215a. First wire harness; 215b. Second wire harness; 215c. Third wire harness; 215d. Fourth wire harness; 215e. Fifth wire harness; 215f. Sixth wire harness;

[0050] 21a. First battery cell; 21a1. First side; 21a2. Second side; 21a3. Third side; 21b. Second battery cell; 21b1. Fourth side; 21b2. Fifth side; 21b3. Sixth side; 21c. Positive electrode plate; 21d. First separator; 21e. Negative electrode plate; 21f. Second separator. Detailed implementation mode

[0051] To make the technical solutions and beneficial effects of the present invention more obvious and understandable, the following will be described in detail by listing specific embodiments. Among them, the drawings are not necessarily drawn to scale, and local features can be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application belongs.

[0052] In the description of the present invention, the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of simplifying the description of the present invention, rather than indicating that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, that is, it cannot be understood as a limitation to the present invention.

[0053] In the present invention, the terms "first" and "second" are only used for the purpose of clear description, and cannot be understood as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features defined with "first" and "second" can clearly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc.; the meaning of "several" is at least one, such as one, two, three, etc.; unless otherwise clearly and specifically defined.

[0054] In the present invention, unless otherwise clearly defined, terms such as "installed", "connected", "joined", "fixed", "set", etc. shall be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and can also be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the present invention, unless otherwise clearly defined, a first feature being "on", "above", "over", "upward", "under", "beneath", "below", or "downward" of a second feature can be that the first feature is in direct contact with the second feature, or the first feature and the second feature are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "over", or "upward" of a second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. A first feature being "under", "beneath", or "downward" of a second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0056] Please refer to Figures 1 to 5 , a battery pack 100 provided by an embodiment of the present application includes a box body 10 and a battery module 20. The battery module 20 is disposed inside the box body 10. The battery module 20 includes a plurality of battery cells 210 that are attached and connected along a first direction and a second direction, that is, respectively, Figure 1 the direction of arrow s1 shown in Figure 1 and the direction of arrow s2 shown in

[0057] The battery cell 210 includes a housing 211, a battery cell group 212, a first top cover assembly 213, a second top cover assembly 214, and a voltage acquisition structure 215. Among them, the housing 211 is in a prismatic shape and is made of a high-strength metal material such as steel or aluminum. The housing 211 extends along a third direction, that is, Figure 1 the direction of arrow s3 shown in

[0058] The battery cell group 212 is located inside the accommodation cavity. The battery cell group 212 includes at least two single battery cells 2121, and the at least two single battery cells 2121 are connected end to end and in series.

[0059] The first top cover assembly 213 is connected to the first opening 2111 of the housing 211 and is electrically connected to the adjacent single cell 2121. The second top cover assembly 214 is connected to the second opening 2112 of the housing 211 and is electrically connected to the adjacent single cell 2121.

[0060] The voltage acquisition structure 215 includes at least two acquisition wire harnesses 2151. One ends of at least two acquisition wire harnesses 2151 are all connected to the first top cover assembly 213, and the other ends of at least two acquisition wire harnesses 2151 are sequentially connected to at least two single cells 2121 to acquire the voltage information of each single cell 2121.

[0061] In the above battery pack 100, the voltage information acquisition structure is integrated on the single cell 2121, which simplifies the electrical structure of the battery pack 100 and improves the acquisition accuracy of the voltage information at the same time. In addition, multiple single cells 2121 are connected in series and placed in the housing 211, which can reduce the process complexity of the battery system, effectively reduce the connecting parts, save space and improve the volume utilization rate.

[0062] Positive electrode tabs 2122 and negative electrode tabs (not shown in the figure) are correspondingly provided on both sides of the single cell 2121. The single cell 2121 is coated with an aluminum-plastic film. After the bare cell is encapsulated, one end of its pole column is first sealed by plastic sealing, then electrolyte is injected from the other end, and then the other end is sealed by plastic sealing.

[0063] Figure 2 The figure shows a schematic diagram of the connection relationship of six single cells 2121 connected in series end to end and the corresponding six acquisition wire harnesses 2151. Figure 3 The figure shows Figure 2 a schematic diagram of the connection relationship between the six acquisition wire harnesses 2151 and the first top cover assembly 213 in. As Figure 3 and Figure 5 shown, one ends of the six acquisition wire harnesses 2151 are all connected to the first top cover assembly 213, and the other ends of the six acquisition wire harnesses 2151 are sequentially connected to the other single cells 2121 connected in series, so that each acquisition wire harness 2151 can acquire the voltage information of each single cell 2121 respectively.

[0064] Figure 2 The figure shows a housing 211 in the shape of a regular hexagonal prism. Of course, the shape of the housing 211 is not limited to the regular hexagonal prism shape. The shape of the housing 211 can also be a pentagonal prism shape, an octagonal prism shape, a decagonal prism shape, etc., which can be set according to specific requirements and are not limited in the embodiments of the present application.

[0065] Specifically, please refer to Figures 2 to 4, the six acquisition wire harnesses 2151 include a first wire harness 215a, a second wire harness 215b, a third wire harness 215c, a fourth wire harness 215d, a fifth wire harness 215e, and a sixth wire harness 215f. The first wire harness 215a, the second wire harness 215b, the third wire harness 215c, the fourth wire harness 215d, the fifth wire harness 215e, and the sixth wire harness 215f are sequentially connected to the six single cells 2121.

[0066] Correspondingly, the six single cells 2121 include a first single cell 212a, a second single cell 212b, a third single cell 212c, a fourth single cell 212d, a fifth single cell 212e, and a sixth single cell 212f. The first top cover assembly 213 is electrically connected to the positive electrode tab 2122 of the first single cell 212a. The negative electrode tab of the first single cell 212a is connected to the positive electrode tab 2122 of the second single cell 212b. Sequentially, the negative electrode tab of the second single cell 212b is connected to the positive electrode tab 2122 of the third single cell 212c. The negative electrode tab of the sixth single cell 212f is electrically connected to the second top cover assembly 214. The negative electrode tabs and the positive electrode tabs 2122 of adjacent single cells 2121 are connected by means such as laser welding, ultrasonic welding, riveting, and crimping.

[0067] One end of the first wire harness 215a, the second wire harness 215b, the third wire harness 215c, the fourth wire harness 215d, the fifth wire harness 215e, and the sixth wire harness 215f is connected to the first top cover assembly 213. The other end of the first wire harness 215a is connected to the connection point between the negative electrode tab of the first single cell 212a and the positive electrode tab 2122 of the second single cell 212b. The other end of the second wire harness 215b is connected to the connection point between the negative electrode tab of the second single cell 212b and the positive electrode tab 2122 of the third single cell 212c. The other end of the third wire harness 215c is connected to the connection point between the negative electrode tab of the third single cell 212c and the positive electrode tab 2122 of the fourth single cell 212d. The other end of the fourth wire harness 215d is connected to the connection point between the negative electrode tab of the fourth single cell 212d and the positive electrode tab 2122 of the fifth single cell 212e. The other end of the fifth wire harness 215e is connected to the connection point between the negative electrode tab of the fifth single cell 212e and the positive electrode tab 2122 of the sixth single cell 212f. The other end of the sixth wire harness 215f is connected to the connection point between the negative electrode tab of the sixth single cell 212f and the second top cover assembly 214. Thus, the first wire harness 215a is used to collect the voltage information of the first single cell 212a; the second wire harness 215b is used to collect the voltage information of the first single cell 212a and the second single cell 212b; the third wire harness 215c is used to collect the voltage information of the first single cell 212a, the second single cell 212b, and the third single cell 212c; the fourth wire harness 215d is used to collect the voltage information of the first single cell 212a, the second single cell 212b, the third single cell 212c, and the fourth single cell 212d; the fifth wire harness 215e is used to collect the voltage information of the first single cell 212a, the second single cell 212b, the third single cell 212c, the fourth single cell 212d, and the fifth single cell 212e; the sixth wire harness 215f is used to collect the voltage information of the first single cell 212a, the second single cell 212b, the third single cell 212c, the fourth single cell 212d, the fifth single cell 212e, and the sixth single cell 212f.

[0068] When an abnormality exists in a certain single cell 2121 and the voltage information collected by one or more collection wire harnesses 2151 is abnormal, the accuracy of voltage information collection can be improved, and the safety of the battery pack 100 can be further ensured.

[0069] In an alternative embodiment, please refer to Figures 2 to 6 , at least two collection wire harnesses 2151 are located in the accommodation cavity and are circumferentially distributed around the axis of the single cell 2121, so that at least two collection wire harnesses 2151 surround the single cell 2121. On the one hand, the mutual interference between the collection wire harnesses 2151 can be reduced, and on the other hand, the occupied space of the cell group 212 and the voltage collection structure 215 can be reduced, improving the space utilization rate.

[0070] In an alternative embodiment, the acquisition wire harness 2151 includes a bending portion 2152 and an extending portion 2153. The bending portion 2152 is connected to the end of the extending portion 2153, and the extending portion 2153 of the acquisition wire harness 2151 extends along the axial direction of the single cell 2121.

[0071] The bending portion 2152 includes a first bending portion and a second bending portion. The first bending portion and the second bending portion are respectively connected to both ends of the extending portion 2153. The end of the first bending portion is connected to the first top cover assembly 213, and the end of the second bending portion can be connected between adjacent single cells 2121 or to the second top cover assembly 214.

[0072] The bending shapes of the first bending portion and the second bending portion can be bent according to specific circumstances, and the embodiments of the present application do not make specific limitations.

[0073] In an alternative embodiment, the first top cover assembly 213 and / or the second top cover assembly 214 are provided with insertion portions 213a. The ends of the bending portion 2152 of the acquisition wire harness 2151 are inserted into the insertion portions 213a, and the use of the insertion portions 213a can improve the installation convenience of the acquisition wire harness 2151.

[0074] Furthermore, the insertion portion 213a is a pin 2131. The pin 2131 is embedded in the first top cover assembly 213 and / or the second top cover assembly 214, and both ends of the pin 2131 protrude from the first top cover assembly 213 and / or the second top cover assembly 214. The pin 2131 and the acquisition wire harness 2151 are connected by cold pressure crimping or welding.

[0075] In an alternative embodiment, the accommodation cavity accommodating the battery cell group 212 and the voltage acquisition structure 215 is filled with a filler, and the filler is a thermal conductive adhesive, a structural adhesive, or a thermal conductive structural adhesive.

[0076] Filling the accommodation cavity of the housing 211 with a thermal conductive adhesive, a structural adhesive, or a thermal conductive structural adhesive can greatly improve the structural strength and reliability of the battery unit, and further ensure the structural strength and reliability of the battery pack 100. In addition, the filler can also limit the position and attitude of the acquisition wire harness 2151, and can avoid the situation where the acquisition wire harness 2151 moves in position during later use, thereby ensuring the stability and accuracy of voltage acquisition.

[0077] In an alternative embodiment, please refer to Figure 7, the single cell 2121 is composed of a first separator 21d, a positive electrode plate 21c, a second separator 21f, and a negative electrode plate 21e. The first separator 21d, the positive electrode plate 21c, the second separator 21f, and the negative electrode plate 21e are stacked in sequence. The starting points of the first separator 21d, the positive electrode plate 21c, the second separator 21f, and the negative electrode plate 21e after being stacked in sequence are wound by a winding needle. The shape of the winding needle can be cylindrical or prismatic, and then the outer shape of the bare cell corresponds to a cylindrical or prismatic shape.

[0078] In an alternative embodiment, as Figure 5 shown, the first top cover assembly 213 includes a first top cover plate 2132, a first pole 2133, a first insulating member 2134, and a first adapter plate 2135. Among them, the first top cover plate 2132 is connected to the first opening 2111 of the housing 211, and the first top cover plate 2132 is made by a nano-injection molding process. The first pole 2133 is connected to the first top cover plate 2132, and the material of the first pole 2133 is aluminum or copper. The material of the top cover plate in contact with the housing 211 is the same as that of the housing 211 to facilitate the welding of the top cover plate and the housing 211. The first insulating member 2134 is connected between the first pole 2133 and the first top cover plate 2132. One end of the first adapter plate 2135 is connected to the side of the first top cover plate 2132 close to the single cell 2121, and the other end is connected to the positive electrode tab 2122 or the negative electrode tab of the single cell 2121 adjacent to the first top cover plate 2132. The first adapter plate 2135 is a flexible adapter plate. It can be understood that the first adapter plate 2135 has a deformation amount. When an external force is applied, the first adapter plate 2135 deforms, and thus the structural stability and safety of the battery unit can be ensured.

[0079] In an alternative embodiment, as Figure 6 shown, the second top cover assembly 214 includes a second top cover plate 2141, a second pole 2142, a second insulating member 2143, and a second adapter plate 2144. The second top cover plate 2141 is connected to the second opening 2112 of the housing 211, and the second insulating member 2143 is connected between the second pole 2142 and the second top cover plate 2141. The second adapter plate 2144 and the first adapter plate 2135 are also flexible adapter plates and also have a deformation amount.

[0080] As Figures 4 to 6As shown, the first top cover assembly 213 is provided with a plug-in portion 213a, and multiple collection wire harnesses 2151 are inserted into the plug-in portion 213a. The second top cover assembly 214 is not provided with the plug-in portion 213a. The sixth wire harness 215f is connected to the second pole 2142 to be able to collect the voltage information of all the single cells 2121 in the battery unit. Of course, the second top cover assembly 214 may also be provided with the plug-in portion 213a, and the sixth wire harness 215f is inserted into the plug-in portion 213a of the second top cover assembly 214. The embodiments of the present application do not make specific limitations in this regard.

[0081] In an alternative embodiment, as Figure 1 shown, the box body 10 is provided with a liquid cooling flow channel 1a. The outer surface of the liquid cooling flow channel 1a is attached to the outer surface of the housing 211, and the outer surface of the liquid cooling flow channel 1a matches the outer surfaces of multiple housings 211 in shape. The liquid cooling flow channel 1a has a profiling structure matching the housings 211 of multiple battery units 210, which can increase the contact area between the liquid cooling flow channel 1a and the battery unit 210, thereby improving the heat dissipation capacity of the battery pack 100.

[0082] In an alternative embodiment, as Figure 1 and Figure 8 shown, the battery unit extends along the Figure 1 arrow s3 direction shown in, and the battery unit 210 includes a first battery unit 21a and a second battery unit 21b.

[0083] Among them, multiple first battery units 21a are connected in the first direction, that is, the Figure 1 arrow s1 direction shown in, to form a first battery cell group. The first battery unit 21a has a first side surface 21a1 facing each other in the first direction. Adjacent first battery units 21a are attached through the first side surface 21a1. The first battery unit 21a also has a second side surface 21a2 and a third side surface 21a3 facing each other. The first direction is perpendicular to the axis direction of the housing.

[0084] Multiple second battery units 21b are connected in the first direction, that is, the Figure 1 arrow s1 direction shown in, to form a second battery cell group. The second battery unit 21b has a fourth side surface 21b1 facing each other in the first direction. Adjacent second battery units 21b are attached through the fourth side surface 21b1. The second battery unit 21b also has a fifth side surface 21b2 and a sixth side surface 21b3 facing each other. In the second direction, that is, the Figure 1 arrow s2 direction shown in, the second side surface 21a2 and the fifth side surface 21b2 are attached, and the third side surface 21a3 and the sixth side surface 21b3 are attached. The second direction is perpendicular to the first direction.

[0085] Figure 8It is shown that the second side 21a2 and the third side 21a3 of the first battery cell 21a are both adhesively connected to the second liquid cooling channel 12a, and the fifth side 21b2 and the sixth side 21b3 of the second battery cell 21b are both adhesively connected to the first liquid cooling channel 11a. It can be understood that the liquid cooling channel 1a has a profiling structure matching the side of the battery cell 210, which can increase the contact area between the liquid cooling channel 1a and the battery cell 210, thereby improving the heat dissipation capacity of the battery pack 100.

[0086] In addition, adjacent first battery cells 21a, adjacent second battery cells 21b, and adjacent first battery cells 21a and second battery cells 21b are all adhesively connected face to face, which not only facilitates the formation of multiple first cell groups and multiple second cell groups, but also improves the structural strength of the battery module 20.

[0087] In an alternative embodiment, as Figure 1 and Figure 8 shown, the box body 10 includes a bottom plate 110, a frame 120, and a top cover 130. The bottom plate 110, the frame 120, and the top cover 130 enclose a receiving cavity, and the battery module 20 is located in the receiving cavity.

[0088] The liquid cooling channel 1a includes a first liquid cooling channel 11a, and the first liquid cooling channel 11a extends along the third direction, that is, the direction of the arrow s3 shown in Figure 1 . The third direction is perpendicular to the first direction and the second direction. The bottom plate 110 has the first liquid cooling channel 11a, and the outer surface of the first liquid cooling channel 11a is adhesively connected to the fifth side 21b2 and the sixth side 21b3 of the second battery cell 21b.

[0089] In an alternative embodiment, the liquid cooling channel 1a includes a second liquid cooling channel 12a, and the second liquid cooling channel 12a extends along the third direction, that is, the direction of the arrow s3 shown in Figure 1 . The top cover 130 has the second liquid cooling channel 12a, and the outer surface of the second liquid cooling channel 12a is adhesively connected to the second side 21a2 and the third side 21a3.

[0090] The second liquid cooling channel 12a and the first liquid cooling channel 11a are respectively provided on the top cover 130 and the bottom plate 110, and the second liquid cooling channel 12a is adhesively connected to the first battery cell 21a, and the first liquid cooling channel 11a is adhesively connected to the second battery cell 21b, which can increase the contact area between the battery cell 210 and the liquid cooling channel 1a and improve the heat dissipation effect of the battery cell 210.

[0091] In an alternative embodiment, both the bottom plate 110 and the top cover 130 are profile structures. Both the bottom plate 110 and the top cover 130 have channels with a rectangular cross-section, which can improve the heat dissipation effect of the battery cell 210, and the profile structure has the characteristics of light weight and high strength, improving the overall stability and safety of the prismatic battery pack 100.

[0092] In an alternative embodiment, as Figure 1 , Figure 9 and Figure 10 shown, the liquid cooling channel 1a includes a plurality of first channels 1a1 that are open at both ends and extend in the third direction, i.e., the direction of the arrow s3 shown in Figure 9 . A first plugging member 1a2 and a second plugging member 1a3. The first plugging member 1a2 is connected to one end of the plurality of first channels 1a1. The first plugging member 1a2 has a second channel and a water inlet 1a21, and the water inlet 1a21 communicates with the second channel. The second plugging member 1a3 is connected to the other end of the plurality of first channels 1a1. The second plugging member 1a3 has a third channel 1a33 and a water outlet 1a31, and the water outlet 1a31 communicates with the third channel 1a33.

[0093] The coolant enters the second channel of the first plugging member 1a2 from the water inlet 1a21 and flows along the Figure 9 direction of the arrow s1 shown in Figure 9 , and flows into the plurality of first channels 1a1. The coolant flows in the first channels 1a1 along the

[0094] direction of the arrow s3 shown in

[0095] Finally, it flows into the third channel 1a33 and is discharged from the water outlet 1a31. Figure 10 In an alternative embodiment, as

[0096] shown, the first plugging member 1a2 and the second plugging member 1a3 have the same structure. A plurality of triangular plates 1a32 are provided on the side of the first plugging member 1a2 close to the first channels 1a1, and the triangular plates 1a32 are connected between adjacent first channels 1a1.

[0097] It should be understood that the above embodiments are all exemplary and do not cover all possible implementation manners. Without departing from the scope of the present disclosure, various deformations and changes can also be made on the basis of the above embodiments. Similarly, any combination of the technical features of the above embodiments can also be made to form additional embodiments of the present application that may not be clearly described. Therefore, the above embodiments only represent several implementation manners of the present application and do not limit the protection scope of the patent of the present application.

Claims

1. A battery pack, characterized in that: include: Box; A battery module, which is arranged in the box, and includes a plurality of battery cells connected in a close connection; Wherein, the battery unit comprises: The housing is provided with a first opening and a second opening opposite to each other, and a receiving cavity is provided between the first opening and the second opening; A battery cell group is located in the accommodating cavity, the battery cell group includes at least two single battery cells arranged along the axis direction of the shell, the single battery cells are connected in series, and the positive electrode tab of each of the single battery cells faces the first opening, and the negative electrode tab of each of the single battery cells faces the second opening; A first top cover assembly is connected to the first opening of the housing and is connected to the positive electrode tab of the adjacent single cell through a first adapter sheet; A second top cover assembly is connected to the second opening of the housing and is connected to the negative electrode tab of the adjacent single cell through a second adapter sheet; The first adapter sheet and the second adapter sheet are flexible adapter sheets; The voltage collection structure includes the same number of collection harnesses as the single battery cells, the collection harnesses are located in the accommodating cavity, one end of each of the collection harnesses is inserted into the plug-in portion provided on the first top cover assembly, and the other end extends along the axis direction of the shell and is connected to the negative pole ear of each of the single battery cells, and multiple collection harnesses are distributed circumferentially around the axis of the single battery cell.

2. The battery pack according to claim 1, characterized in that: The collection harness is located outside the single battery cell.

3. The battery pack according to claim 1, characterized in that: The collection harness comprises a bending portion and an extending portion, the bending portion is connected to an end of the extending portion, and the extending portion extends along an axial direction of the single cell.

4. The battery pack according to claim 3, characterized in that: The end of the bent portion of the collection harness is inserted into the plug-in portion.

5. The battery pack according to claim 4, characterized in that: The plug-in portion is a pin, the pin is embedded in the first top cover component, and two ends of the pin protrude from the first top cover component.

6. The battery pack according to any one of claims 1 to 5, characterized in that: The accommodating cavity accommodating the battery cell group is filled with a filler, and the filler is a thermal conductive adhesive or a structural adhesive.

7. The battery pack according to any one of claims 1 to 5, characterized in that: The single cell is composed of a first separator, a positive electrode sheet, a second separator and a negative electrode sheet, and the first separator, the positive electrode sheet, the second separator and the negative electrode sheet are stacked in sequence.

8. The battery pack according to claim 1, characterized in that: The first top cover assembly comprises: A first top cover plate connected to the first opening of the shell; A first pole connected to the first top cover plate; A first insulating member connected between the first pole and the first top cover plate; One end of the first adapter sheet is connected to a side of the first top cover plate close to the single cell, and the other end is connected to a positive electrode tab of the single cell adjacent to the first top cover plate.

9. The battery pack according to claim 1, characterized in that: The box body is provided with a liquid cooling channel, the outer surface of the liquid cooling channel is in contact with the outer surface of the shell, and the outer surface of the liquid cooling channel matches the shape of multiple outer surfaces of the shell.

10. The battery pack according to claim 9, characterized in that: The battery unit comprises: A first battery unit, wherein a plurality of the first battery units are connected in a first direction to form a first battery cell group, the first battery units have first side surfaces facing each other in the first direction, adjacent first battery units are attached via the first side surfaces, the first battery units further have second side surfaces and third side surfaces facing each other, and the first direction is perpendicular to the axial direction of the housing; A second battery cell, a plurality of the second battery cells are connected in the first direction to form a second battery cell group, the second battery cells have fourth sides facing each other in the first direction, adjacent second battery cells are bonded via the fourth sides, the second battery cells also have a fifth side and a sixth side facing each other, in the second direction the second side is bonded to the fifth side, and the third side is bonded to the sixth side, and the second direction is perpendicular to the first direction.

Images