Battery pack

Abstract

The invention relates to a battery pack, the battery pack comprises a box body and a battery module, the battery module is arranged in the box body, the battery module comprises a plurality of battery units which are in fit connection, each battery unit comprises a shell, a battery cell group, a first top cover assembly, a second top cover assembly and a voltage acquisition structure, and the battery cell group comprises at least two single battery cells which are connected in series; the first top cover assembly and the second top cover assembly are electrically connected with the single cells respectively, the voltage acquisition structure comprises at least two acquisition wire harnesses, one ends of the at least two acquisition wire harnesses are connected to the first top cover assembly, and the other ends of the at least two acquisition wire harnesses are sequentially connected with the at least two single cells; therefore, the voltage information of each single cell is acquired. According to the battery pack, the voltage information acquisition structure is integrated on the single cells, so that the electrical structure of the battery pack is simplified, the acquisition accuracy of the voltage information is also improved, and the process complexity of a battery system can be reduced.

Description

Technical Field

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

[0002] The operating status of the battery during use directly affects the performance of the electrical device. Therefore, during the operation of the battery, a battery management system is required to monitor the battery voltage and the battery operating status in a timely manner.

[0003] However, the electrical structure of most current battery packs is relatively complex and has low space utilization. Summary of the invention

[0004] In view of this, an embodiment of the present application provides a battery pack to solve at least one problem existing in the background technology.

[0005] In a first aspect, an embodiment of the present application provides a battery pack, comprising: 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, wherein the battery cell group includes at least two single battery cells, and the single battery cells are connected in series; A first top cover assembly, connected to the first opening of the housing and electrically connected to the single battery cell; A second top cover assembly is connected to the second opening of the housing and is electrically connected to the single battery cell; The voltage collection structure includes at least two collection harnesses, one end of at least two of the collection harnesses is connected to the first top cover assembly, and the other end of at least two of the collection harnesses is connected to at least two of the single cells in sequence to collect voltage information of each of the single cells.

[0006] In combination with the first aspect of the present application, in an optional implementation manner, the collection harness is located in the accommodating cavity and outside the single battery cell.

[0007] In combination with the first aspect of the present application, in an optional implementation, the collection harness includes 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 battery cell.

[0008] In combination with the first aspect of the present application, in an optional embodiment, the first top cover assembly and / or the second top cover assembly is provided with a plug-in portion, and the end of the bent portion of the collection harness is plugged into the plug-in portion.

[0009] In combination with the first aspect of the present application, in an optional embodiment, the plug-in portion is a pin, the pin is embedded in the first top cover assembly and / or the second top cover assembly, and both ends of the pin protrude from the first top cover assembly and / or the second top cover assembly.

[0010] In combination with the first aspect of the present application, in an optional implementation manner, the accommodating 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.

[0011] In combination with the first aspect of the present application, in an optional embodiment, the single battery 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.

[0012] In conjunction with the first aspect of the present application, in an optional implementation, the first top cover assembly includes: 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; The first adapter sheet has one end connected to a side of the first top cover plate close to the single cell, and the other end connected to a positive electrode tab or a negative electrode tab of the single cell adjacent to the first top cover plate.

[0013] In combination with the first aspect of the present application, in an optional embodiment, 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.

[0014] In conjunction with the first aspect of the present application, in an optional implementation, the battery unit includes: 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 also 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.

[0015] The battery pack provided in the embodiment of the present application integrates the voltage information collection structure on the single battery cell, which simplifies the electrical structure of the battery pack and also improves the accuracy of voltage information collection; in addition, multiple single battery cells are placed in series in the shell, which can reduce the process complexity of the battery system and effectively reduce the connection components, while saving space and improving volume utilization.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 A schematic diagram of the overall structure of a battery pack provided in an embodiment of the present application; Figure 2 A schematic diagram of the structural decomposition of a battery cell in a battery pack provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of a first top cover assembly and a plurality of collection harnesses in a battery pack provided in an embodiment of the present application; Figure 4 A schematic diagram of the internal structure of a battery cell in a battery pack provided in an embodiment of the present application; Figure 5 for Figure 4 The enlarged view of point A in the middle; Figure 6 for Figure 4 Enlarged view of point C in the middle; Figure 7 A schematic cross-sectional view of a single cell in a battery pack provided in an embodiment of the present application; Figure 8 A schematic diagram of a portion of the structure of a box and a shell in a battery pack provided in an embodiment of the present application; Fig. 9 A schematic diagram of partial structural decomposition of a base plate and a first liquid cooling channel of the base plate in a battery pack provided in an embodiment of the present application; Fig.10 for Fig. 9 Enlarged view of point B in the middle.

[0018] Reference numerals: 100. Battery pack; 10, box body; 1a, liquid cooling channel; 11a, first liquid cooling channel; 12a, second liquid cooling channel; 1a1, first channel; 1a2, first blocking member; 1a21, water inlet; 1a3, second blocking member; 1a31, water outlet; 1a32, triangle plate; 1a33, third channel; 110, bottom plate; 120, frame; 130, upper cover; 20, battery module; 210, battery cell; 211, housing; 2111, first opening; 2112, second opening; 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; 213, first top cover assembly; 213a, plug-in portion; 2131, pin; 2132, first top cover plate; 2133, first pole; 2134, first insulating member; 2135, first adapter; 214, second top cover assembly; 2141, second top cover plate; 2142, second pole; 2143, second insulating member; 2144, second adapter; 215, voltage collection structure; 2151, collection harness; 2152, bending portion; 2153, extension portion; 215a, first harness; 215b, second harness; 215c, third harness; 215d, fourth harness; 215e, fifth harness; 215f, sixth harness; 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 sheet; 21d, first diaphragm; 21e, negative electrode sheet; 21f, second diaphragm. DETAILED DESCRIPTION

[0019] In order to make the technical solutions and beneficial effects of the present invention more obvious and easy to understand, the following is a detailed description by listing specific embodiments. The drawings are not necessarily drawn to scale, and local features may 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.

[0020] In the description of the present invention, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of simplified description of the present invention, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation to the present invention.

[0021] 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 as "first" and "second" can explicitly include at least one of the features. In the description of the present invention, "multiple" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise clearly and specifically defined.

[0022] In the present invention, unless otherwise clearly defined, the terms "install", "connect", "connect", "fix", "set", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the present invention, unless otherwise clearly defined, a first feature being “on”, “above”, “above”, “below”, “below”, “below” or “below” a second feature may mean that the first feature is in direct contact with the second feature, or the first feature and the second feature are in indirect contact with each other through an intermediate medium. Moreover, a first feature being “on”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the horizontal height of the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0024] Please refer to Figures 1 to 5 A battery pack 100 provided in an embodiment of the present application includes a box body 10 and a battery module 20. The battery module 20 is disposed in the box body 10. The battery module 20 includes a plurality of battery modules along a first direction and a second direction, namely, Figure 1 The direction of arrow s1 shown in Figure 1 The battery cell 210 is fitted and connected in the direction of arrow s2 shown in FIG.

[0025] The battery unit 210 includes a shell 211, a battery cell group 212, a first top cover assembly 213, a second top cover assembly 214 and a voltage collection structure 215; wherein the shell 211 is in the shape of a prism, and the shell 211 is made of a high-strength metal material such as steel or aluminum. The shell 211 is along the third direction, i.e. Figure 1 The shell 211 extends in the direction of arrow s3 shown in the figure. Two ends of the shell 211 are provided with a first opening 2111 and a second opening 2112 opposite to each other, and an accommodating cavity is defined between the first opening 2111 and the second opening 2112.

[0026] The battery cell group 212 is located in the accommodating cavity. The battery cell group 212 includes at least two single battery cells 2121 . The at least two single battery cells 2121 are connected end to end and in series.

[0027] 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.

[0028] The voltage collection structure 215 includes at least two collection harnesses 2151 , one end of the at least two collection harnesses 2151 is connected to the first top cover assembly 213 , and the other end of the at least two collection harnesses 2151 is connected to at least two single cells 2121 in sequence to collect voltage information of each single cell 2121 .

[0029] The above battery pack 100 integrates the voltage information collection structure on the single cell 2121, which simplifies the electrical structure of the battery pack 100 and also improves the accuracy of voltage information collection; in addition, multiple single cells 2121 are placed in series in the shell 211, which can reduce the process complexity of the battery system and effectively reduce the connection components, while saving space and improving volume utilization.

[0030] The two sides of the single cell 2121 correspond to a positive electrode tab 2122 and a negative electrode tab (not shown in the figure). The single cell 2121 is covered with an aluminum-plastic film. After the aluminum-plastic film encapsulates the bare cell, one end of the pole is first sealed, and then the electrolyte is injected from the other end, and then the other end is sealed.

[0031] Figure 2 Schematic diagram showing the connection relationship between six single cells 2121 connected in series end to end and the corresponding six collection harnesses 2151. Figure 3 It is shown in Figure 2 Schematic diagram of the connection relationship between the six collection harnesses 2151 and the first top cover assembly 213. Figure 3 and Figure 5 As shown, one end of the six collection harnesses 2151 is connected to the first top cover assembly 213, and the other ends of the six collection harnesses 2151 are respectively connected to other single cells 2121 connected in series, so that each collection harness 2151 can collect voltage information of each single cell 2121 respectively.

[0032] Figure 2 The shell 211 is shown in the shape of a regular hexagonal prism. Of course, the shape of the shell 211 is not limited to the regular hexagonal prism. The shape of the shell 211 can also be a pentagonal prism, an octagonal prism, a decagonal prism, etc., which can be set according to specific needs and is not limited in the embodiments of the present application.

[0033] Specifically, please refer to Figures 2 to 4 The six collection harnesses 2151 include a first harness 215a, a second harness 215b, a third harness 215c, a fourth harness 215d, a fifth harness 215e and a sixth harness 215f. The first harness 215a, the second harness 215b, the third harness 215c, the fourth harness 215d, the fifth harness 215e and the sixth harness 215f are connected to the six single cells 2121 in sequence.

[0034] 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, and the negative electrode tab of the second single cell 212b is connected to the positive electrode tab 2122 of the third single cell 212c, and 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 positive electrode tabs 2122 of adjacent single cells 2121 are connected by laser welding, ultrasonic welding, riveting, crimping, etc.

[0035] One end of the first wiring harness 215a, the second wiring harness 215b, the third wiring harness 215c, the fourth wiring harness 215d, the fifth wiring harness 215e and the sixth wiring harness 215f are all connected to the first top cover assembly 213, the other end of the first wiring harness 215a is connected to the connection between the negative electrode tab of the first single battery cell 212a and the positive electrode tab 2122 of the second single battery cell 212b, the other end of the second wiring harness 215b is connected to the connection between the negative electrode tab of the second single battery cell 212b and the positive electrode tab 2122 of the third single battery cell 212c, and the other end of the third wiring harness 215c is connected to the At the connection 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 wiring harness 215d is connected to the connection 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 wiring harness 215e is connected to the connection between the negative electrode tab of the fifth single cell 212e and the positive electrode tab 2122 of the sixth single cell 212f, and the other end of the sixth wiring harness 215f is connected to the connection between the negative electrode tab of the sixth single cell 212f and the second top cover assembly 214. Thus, the first wiring harness 215a is used to collect voltage information of the first single cell 212a; the second wiring harness 215b is used to collect voltage information of the first single cell 212a and the second single cell 212b; the third wiring harness 215c is used to collect voltage information of the first single cell 212a, the second single cell 212b and the third single cell 212c; the fourth wiring harness 215d is used to collect voltage information of the first single cell 212a, the second single cell 212b, the third single cell 212c and the fourth single cell The fifth wiring harness 215e is used to collect the voltage information of the first monomer cell 212a, the second monomer cell 212b, the third monomer cell 212c, the fourth monomer cell 212d and the fifth monomer cell 212e; the sixth wiring harness 215f is used to collect the voltage information of the first monomer cell 212a, the second monomer cell 212b, the third monomer cell 212c, the fourth monomer cell 212d, the fifth monomer cell 212e and the sixth monomer cell 212f.

[0036] When a single battery cell 2121 has an abnormality, the voltage information collected by one or more collection harnesses 2151 has an abnormality, which can improve the accuracy of voltage information collection and further ensure the safety of the battery pack 100.

[0037] In an alternative embodiment, please refer to Figures 2 to 6 At least two collection harnesses 2151 are located in the accommodating cavity and are distributed circumferentially around the axis of the single battery cell 2121, so that at least two collection harnesses 2151 surround the single battery cell 2121. On the one hand, mutual interference between the collection harnesses 2151 can be reduced, and on the other hand, the occupied space of the battery cell group 212 and the voltage collection structure 215 can be reduced, thereby improving space utilization.

[0038] In an optional embodiment, the collection 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 collection harness 2151 extends along the axial direction of the single cell 2121 .

[0039] 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 the two ends of the extension 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 the second top cover assembly 214.

[0040] 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.

[0041] In an optional embodiment, the first top cover assembly 213 and / or the second top cover assembly 214 is provided with a plug-in portion 213a, and the end of the bent portion 2152 of the collection harness 2151 is plugged into the plug-in portion 213a. The plug-in portion 213a can improve the installation convenience of the collection harness 2151.

[0042] Further, the plug-in portion 213a is a pin 2131, which is embedded in the first top cover component 213 and / or the second top cover component 214, and both ends of the pin 2131 protrude from the first top cover component 213 and / or the second top cover component 214. The pin 2131 is connected to the collection harness 2151 by cold pressing or welding.

[0043] In an optional embodiment, the accommodating cavity accommodating the battery cell group 212 and the voltage collection structure 215 is filled with a filler, and the filler is a thermal conductive adhesive, a structural adhesive or a thermal conductive structural adhesive.

[0044] Filling the accommodating cavity of the shell 211 with thermally conductive adhesive, structural adhesive or thermally 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 posture of the collection harness 2151, and can avoid the position movement of the collection harness 2151 during later use, thereby ensuring the stability and accuracy of voltage collection.

[0045] In an alternative embodiment, please refer to Figure 7The single cell 2121 is composed of a first separator 21d, a positive electrode sheet 21c, a second separator 21f and a negative electrode sheet 21e, which are stacked in sequence. The starting point of the stacked first separator 21d, the positive electrode sheet 21c, the second separator 21f and the negative electrode sheet 21e is wound by a winding needle, and the shape of the winding needle can be cylindrical or prismatic, and the shape of the bare cell is correspondingly cylindrical or prismatic.

[0046] In an alternative embodiment, if Figure 5 As 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 2135. The first top cover plate 2132 is connected to the first opening 2111 of the shell 211, and the first top cover plate 2132 is made by nano injection molding. 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 shell 211 is consistent with the material of the shell 211, so as to facilitate the welding of the top cover plate and the shell 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 2135 is connected to one 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 2135 is a flexible adapter, which can be understood as having a deformation amount. When subjected to external force, the first adapter 2135 is deformed, thereby ensuring the structural stability and safety of the battery unit.

[0047] In an alternative embodiment, if Figure 6 As 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 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 2144 is also a flexible adapter like the first adapter 2135, and also has a deformation amount.

[0048] like Figures 4 to 6As shown, the first top cover assembly 213 is provided with a plug-in portion 213a, and a plurality of collection harnesses 2151 are plugged into the plug-in portion 213a, the second top cover assembly 214 is not provided with a plug-in portion 213a, and the sixth harness 215f is connected to the second pole 2142 to collect voltage information of all single cells 2121 in the battery unit. Of course, the second top cover assembly 214 may also be provided with a plug-in portion 213a, and the sixth harness 215f is plugged into the plug-in portion 213a of the second top cover assembly 214, which is not specifically limited in the embodiment of the present application.

[0049] In an alternative embodiment, if Figure 1 As shown, the box body 10 is provided with a liquid cooling channel 1a, the outer surface of the liquid cooling channel 1a is in contact with the outer surface of the shell 211, and the outer surface of the liquid cooling channel 1a matches the shape of the outer surfaces of the multiple shells 211. The liquid cooling channel 1a has a contoured structure that matches the shells 211 of the multiple battery cells 210, which can increase the contact area between the liquid cooling channel 1a and the battery cells 210, thereby improving the heat dissipation capacity of the battery pack 100.

[0050] In an alternative embodiment, if Figure 1 and Figure 8 As shown, the battery cells are Figure 1 The battery unit 210 extends in the direction of the arrow s3 shown in FIG. 1 , and includes a first battery unit 21 a and a second battery unit 21 b .

[0051] Among them, the plurality of first battery cells 21a are arranged in a first direction. Figure 1 The first battery cell group is connected in the direction of arrow s1 shown in the figure, and the first battery cells 21a have first side surfaces 21a1 facing each other in the first direction, and adjacent first battery cells 21a are attached through the first side surfaces 21a1. The first battery cells 21a also have second side surfaces 21a2 and third side surfaces 21a3 facing each other, and the first direction is perpendicular to the axial direction of the shell.

[0052] The plurality of second battery cells 21b are arranged in a first direction. Figure 1 The second battery cell group is formed by connecting in the direction of arrow s1 shown in the figure. The second battery cells 21b have fourth side surfaces 21b1 facing each other in the first direction. Adjacent second battery cells 21b are attached through the fourth side surfaces 21b1. The second battery cells 21b also have fifth side surfaces 21b2 and sixth side surfaces 21b3 facing each other. Figure 1 In the direction of arrow s2 shown in FIG. 1 , the second side surface 21a2 is in contact with the fifth side surface 21b2, and the third side surface 21a3 is in contact with the sixth side surface 21b3, and the second direction is perpendicular to the first direction.

[0053] Figure 8It is shown that the second side 21a2 and the third side 21a3 of the first battery cell 21a are both attached 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 attached to the first liquid cooling channel 11a. It can be understood that the liquid cooling channel 1a has a contoured structure that matches 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.

[0054] 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 directly facing and connected, which not only facilitates the formation of multiple first battery cell groups and multiple second battery cell groups, but also can improve the structural strength of the battery module 20.

[0055] In an alternative embodiment, if Figure 1 and Figure 8 As shown, the box body 10 includes a bottom plate 110, a frame 120 and an upper cover 130. The bottom plate 110, the frame 120 and the upper cover 130 are arranged to form a receiving cavity, and the battery module 20 is located in the receiving cavity.

[0056] The liquid cooling channel 1a includes a first liquid cooling channel 11a, and the first liquid cooling channel 11a is along the third direction, that is, Figure 1 The third direction extends in the direction of arrow s3 shown in the figure, and the third direction is perpendicular to the first direction and the second direction. The bottom plate 110 has a first liquid cooling channel 11a, and the outer surface of the first liquid cooling channel 11a is attached to the fifth side 21b2 and the sixth side 21b3 of the second battery unit 21b.

[0057] In an optional embodiment, the liquid cooling channel 1a includes a second liquid cooling channel 12a, and the second liquid cooling channel 12a is along the third direction. Figure 1 The upper cover 130 extends in the direction of the arrow s3 shown in FIG. 1 , and has a second liquid-cooling channel 12a , and the outer surface of the second liquid-cooling channel 12a is in contact with the second side surface 21a2 and the third side surface 21a3 .

[0058] A second liquid cooling channel 12a and a first liquid cooling channel 11a are respectively provided on the upper cover 130 and the bottom plate 110, and the second liquid cooling channel 12a is closely connected to the first battery cell 21a, and the first liquid cooling channel 11a is closely 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.

[0059] In an optional embodiment, the bottom plate 110 and the upper cover 130 are both profile structures. The bottom plate 110 and the upper cover 130 both have a channel 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, which improves the overall stability and safety of the prismatic battery pack 100.

[0060] In an alternative embodiment, if Figure 1 , Fig. 9 and Fig.10 As shown, the liquid cooling channel 1a includes a plurality of openings at both ends along the third direction, i.e. Fig. 9 The first flow channel 1a1, the first blocking member 1a2 and the second blocking member 1a3 extending in the direction of the arrow s3 shown in FIG. The first blocking member 1a2 is connected to one end of the plurality of first flow channels 1a1, and the first blocking member 1a2 has a second flow channel and a water inlet 1a21, and the water inlet 1a21 is connected to the second flow channel. The second blocking member 1a3 is connected to the other end of the plurality of first flow channels 1a1, and the second blocking member 1a3 has a third flow channel 1a33 and a water outlet 1a31, and the water outlet 1a31 is connected to the third flow channel 1a33.

[0061] The coolant enters the second flow channel of the first blocking member 1a2 from the water inlet 1a21 and flows along Fig. 9 The coolant flows in the direction of arrow s1 shown in FIG. 1 and flows into a plurality of first flow channels 1a1. The coolant flows in the first flow channels 1a1 along Fig. 9 The water flows in the direction of arrow s3 shown in the figure, and finally flows into the third flow channel 1a33 and is discharged from the water outlet 1a31.

[0062] In an optional embodiment, the cross section of the first flow channel 1a1 is an isosceles triangle. The first flow channel 1a1 with an isosceles triangle cross section can, on the one hand, be used to match the battery cell 210 with a hexagonal prism structure to increase the contact area between the battery cell 210 and the first flow channel 1a1; on the other hand, the first flow channel 1a1 with this structure has a strong structural strength, which can further ensure the structural stability and safety of the prismatic battery pack 100.

[0063] In an alternative embodiment, if Fig.10 As shown, the first blocking member 1a2 has the same structure as the second blocking member 1a3. A plurality of triangular plates 1a32 are provided on one side of the first blocking member 1a2 close to the first flow channel 1a1. The triangular plates 1a32 are connected between adjacent first flow channels 1a1.

[0064] The triangular plate 1a32 is used to make the first sealing member 1a2 match the opening of the first flow channel 1a1, so as to seal the first flow channel 1a1 and the second flow channel, and the first flow channel 1a1 and the third flow channel 1a33, and to improve the structural stability of the first sealing member 1a2 and the first flow channel 1a1, and the second sealing member 1a3 and the first flow channel 1a1.

[0065] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations. Various modifications and changes may also be made on the basis of the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may also be combined arbitrarily to form other embodiments of the present application that may not be clearly described. Therefore, the above embodiments only express several implementations of the present application and do not limit the scope of protection of the patent of this 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, wherein the battery cell group includes at least two single battery cells, and the single battery cells are connected in series; A first top cover assembly, connected to the first opening of the housing and electrically connected to the single battery cell; A second top cover assembly is connected to the second opening of the housing and is electrically connected to the single battery cell; The voltage collection structure includes at least two collection harnesses, one end of at least two of the collection harnesses is connected to the first top cover assembly, and the other end of at least two of the collection harnesses is connected to at least two of the single cells in sequence to collect voltage information of each of the single cells.

2. The battery pack according to claim 1, characterized in that: The collection harness is located in the accommodating cavity and 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 first top cover assembly and / or the second top cover assembly is provided with a plug-in portion, and the end of the bent portion of the collection harness is plugged 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 / or the second top cover component, and both ends of the pin protrude from the first top cover component and / or the second 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, a structural adhesive or a thermal conductive 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; The first adapter sheet has one end connected to a side of the first top cover plate close to the single cell, and the other end connected to a positive electrode tab or a negative 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.

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