Battery pack and motor vehicle

Abstract

A battery pack comprising:a housing (1) comprising a first chamber structure (11c); andat least one battery module (2) arranged in the first chamber structure (11c), wherein the battery module (2) comprises a cell group (22) and a surrounding frame (21) configured to surround the cell group (22), wherein the surrounding frame (21) is detachably connected to the housing (1).

Description

Technical FieldThe present disclosure relates to the field of batteries, and more particularly to a battery pack and an automobile.Prior ArtA battery system including battery cells is a core component of new energy vehicles. When battery cells are grouped in a conventional battery system, the grouped battery cells are typically packaged into one or more battery modules by peripheral structural members, and these battery modules, each of which functions as a unit, are integrated into a battery case. However, the integrated structure as described above is complex and it is cumbersome, time-consuming, and labor-intensive in the assembly process, and the rigid strength of the entire battery pack is also weak.For the above reasons, the CTP (Cell to Pack) battery packs have been devised, omitting the step of manufacturing the battery modules, and instead providing the battery packs directly from the battery cells, thereby eliminating the intermediate steps and improving the space utilization and energy density of the battery packs. Currently, in most CTP battery packs, a large amount of adhesive is used to directly bond and secure a plurality of battery cells to the housing so that the modules cannot be disassembled. Thus, if one of the battery cells in the modules fails, the entire battery pack needs to be replaced, and maintenance costs are significantly increased.Disclosure of the ApplicationThe present disclosure provides a battery pack and an automobile that can solve the above technical problems.The present disclosure includes a battery pack including:a housing including a first chamber structure;at least one battery module disposed in the first chamber structure, wherein the battery module includes a cell group and a surrounding frame for surrounding the cell group, and the surrounding frame is detachably connected to the housing.The present disclosure also provides an automobile including the battery pack as described above.Advantageous EffectsThe present disclosure provides an advantageous effect that, by surrounding the cell group of the battery pack according to the present disclosure using the surrounding frame and detachably connecting the surrounding frame to the case when a cell group fails, the failed cell group is only taken out of the surrounding frame and repaired or replaced without replacing the entire battery pack, thereby reducing maintenance costs and improving maintenance efficiency.Brief Description of the FiguresFIG. 1 is a schematic diagram of a battery pack according to some embodiments of the present disclosure. FIG. 2 is a schematic diagram of a first exploded view of a battery pack according to some embodiments of the present disclosure. FIG. 3 is a schematic diagram of a second exploded view of a battery pack according to some embodiments of the present disclosure. FIG. 4 is a schematic diagram of a third exploded view of a battery pack according to some embodiments of the present disclosure. FIG. 5 is a schematic diagram of a housing in a battery pack according to some embodiments of the present disclosure. FIG. 6 is an exploded schematic view of a housing in a battery pack according to some embodiments of the present disclosure. FIG. 7 is an exploded schematic view of a case frame ( 11) in a case according to some embodiments of the present disclosure. FIG. 8 is a schematic diagram of a cell group in a battery pack according to some embodiments of the present disclosure. FIG. 9 is an exploded schematic view of a cell group in a battery pack according to some embodiments of the present disclosure. FIG. 10 is an exploded schematic view of a CCS package in a cell group according to some embodiments of the present disclosure. FIG. 11 is a schematic diagram of a bus bar in a CCS package according to some embodiments of the present disclosure. FIG. 12 is a schematic diagram of a first conductive element in a bus bar according to some embodiments of the present disclosure. FIG. 13 is a schematic diagram of a second conductive element in a bus bar according to some embodiments of the present disclosure. FIG. 14 is a schematic diagram of a third conductive element in a bus bar according to some embodiments of the present disclosure. FIG. 15 is a schematic diagram for installing a base plate and a plurality of surrounding beams in a cell group according to some embodiments of the present disclosure. FIG. 16 is a schematic diagram of a battery pack according to some embodiments of the present disclosure. FIG. 17 is a schematic diagram showing a structure of a battery pack in which a tip cover of a case is hidden according to some embodiments of the present disclosure. FIG. 18 is an exploded schematic view of an output electrode base according to some embodiments of the present disclosure. FIG. 19 is a schematic diagram of an output electrode base according to some embodiments of the present disclosure. FIG. 20 is a schematic diagram of a bottom surface of an output electrode base according to some embodiments of the present disclosure. FIG. 21 is a plan view of an output electrode base according to some embodiments of the present disclosure. FIG. 22 is a schematic cross-sectional view taken along A-A in FIG. 21. FIG. 23 is an exploded schematic view of a partial structure of a battery pack according to some embodiments of the present disclosure. FIG. 24 is an exploded schematic view of a battery case and an output electrode base in a battery pack according to some embodiments of the present disclosure.Reference Number:1. Housing; 11 Housing frame (11); 11a. First frame; 11b. Second frame; 11c. First chamber structure; 11d. Second chamber structure; 111. First side bar; 112. Second side beam; 113. Slot-Pin Connection Structure; 1131. Convex pin; 1132. Concave slot; 114. Top cover; 12th Inner beam; 121. Mounting groove; 1221. Third female groove; 13th bottom protection plate; 131. First bottom protection plate; 132. Second bottom protection plate; 133. Liquid pipe; 14. Electric element; 151. First sealing element; 152. Second sealing member; 16th positioning rib; 17th reinforcing beam; 18th reinforcing plate; 19th output electrode base; 191. Third male buckle; 2. battery module; 21. surrounding frame; 211. First surrounding beam; 212. Second surrounding beam; 213. Adhesive holding groove; 22nd cell group; 221. Battery cell; 23rd CCS assembly; 231. Insulating Cover; 2311. First observation hole; 2312. Second observation hole; 232. Bus bar; 2321. Protrusion; 2322. Abutment portion; 2323. Bus bar unit; 23231. First conductive unit; 23232. Second conductive unit; 23233. Third conductive unit; 23234. Fourth conductive unit; 23235. First conductive row; 23236. Second conductive row; 23237. Third conductive row; 23238. First connection portion; 23239. Second connection portion; 23240. Third connection portion; 2324. Connecting piece; 24th Grundplatte plate; 25th Einrast structure; 251. Male buckle; 252. Female groove; 26th Liquid cooling assembly; 261. Liquid cooling block; 262. Separating hole; 27 Second foam adhesive; 28 Thermal barrier coating; 3 First foam adhesive; 4 Support; 41 Insulating plate; 42 Insulating beam; 5 Insulating base; 51 Boundary plate; 6 Conductive bracket; 61 Connecting member; 611. Annular flange; 612. Step structure; 62th Hohlraum; 64th Nut body; 7th Ausgangs electrode connector; 8th Adapter holder; 81thFirst adapter disk; 82thSecond adapter disk.DETAILED DESCRIPTION OF EMBODIMENTSEmbodiment 1Referring to FIGS. 1 to 15, the present disclosure includes a battery pack including a housing 1 and at least one battery module 2 disposed in the housing 1.The housing 1 may be rectangular. A first chamber structure 11 cmay be disposed in the housing 1. At least one battery module 2 is placed in the first chamber structure 11 c. The battery module 2 includes a cell group 22 and a surrounding frame 21 surrounding the cell group 22. The surrounding frame 21 is detachably connected to the housing 1.The battery pack further includes a fixing member for connecting the surrounding frame 21 to the case 1. One or more adhesive holding grooves 213 are disposed on a side of the surrounding frame 21 opposite to the cell group 22. A part of the first foam adhesive 3 is filled in the adhesive holding grooves 213, and another part of the first foam adhesive 3 is configured to adhere the housing 1.Thereby, the surrounding frame 21 surrounds the peripheral side of the cell group 22 and is firmly bonded to the case 1 by the first foam adhesive 3. When a cell group 22 fails, the failing cell group 22 can be taken out and replaced by dissolving the first foam adhesive 3 with the adhesive remover. Moreover, the first foam adhesive 3 may provide foam columns of different shapes during the foaming process to improve the adhesive strength by providing the adhesive holding grooves 213 on a side of the surrounding frame 21 opposite from the cell group 22.In other embodiments, the surrounding frame 21 may be snap-fastened to the housing. For example, a male buckle may be provided on the outside of the surrounding frame 21, and a corresponding female groove may be provided on the housing 1. The connection between the surrounding frame 21 and the housing 1 is achieved by fastening the male buckle to the female groove, which is convenient for disassembly and assembly. When a cell group 22 fails, the surrounding frame 21 may be disassembled to take out the failing cell group 22 for repair and replacement, which is not limited thereto.Referring to FIGS. 8 to 9, the surrounding frame 21 is composed of two first surrounding beams 211 spaced apart in parallel in the left-right direction and two second surrounding beams 212 spaced apart in parallel in the left-right direction. The two first surrounding beams 211 and the two second surrounding beams 212 may be connected to each other by a slot-and-pin connection structure. The slot-pin connection structure may include a convex pin and a concave slot that are fitted together. For example, the concave slot may be located at the ends of the first surrounding beam 211, and the convex post may be located at the ends of the second surrounding beam 212. As a result, the connection of the first surrounding beams 211 and the second surrounding beams 212 can be realized by the fitting between the convex pin and the concave slot.In other embodiments, the position of the convex pin may be interchanged with the position of the concave slot as long as the same technical effect can be obtained, which is not limited thereto.In the present embodiment, a plurality of first adhesive holding grooves in a rectangular shape are arranged on an outer side wall of the first surrounding beam 211 along its longitudinal direction, and a plurality of second adhesive holding grooves in a wave shape are arranged on an outer side wall of the second surrounding beam 212 along its longitudinal direction. In other embodiments, the adhesive holding grooves 213 may be provided in a triangular or other polygonal shape, which is not limited thereto.Referring to FIGS. 8 to 15, the battery module 2 further includes a base plate 24 at the bottom of the cell group 22, and the base plate 24 and the surrounding frame 21 form a cavity in which the cell group 22 is disposed.Further, the battery pack further includes a second foam adhesive 27 filled in the cavity. The second foam adhesive 27 bonds the cell group 22, the surrounding frame 21, and the base plate 24 together. When the second foam adhesive 27 is filled in the cavity, the surrounding frame 21 can function as a barrier to the foam adhesive and forms an integral module together with the cell group 22 and the base plate 24 through the foam adhesive, thereby preventing the second foam adhesive 27 from overflowing.Referring also to FIGS. 8 to 9, the battery module 2 further includes a heat insulating layer 28 disposed on the base plate 24. For example, the thermal barrier coating 28 is a mica paper bonded to the top and bottom surfaces of the base plate 24. The configuration of the mica paper on the upper side and lower side of the base plate 24 can prevent the base plate 24 from being damaged by thermal runaway, and in turn prevent influence on the battery cells 221.In addition, the battery module 2 further includes a liquid cooling assembly 26 provided in the cavity. The liquid cooling assembly 26 includes a plurality of liquid cooling blocks 261 in a serpentine shape. A plurality of separation holes 262 are formed between adjacent liquid cooling blocks 261. The separation holes 262 are independent of each other and configured to separate adjacent battery cells 221. The separation holes 262 fully wrap the peripheral wall of the battery cell 221. By the configuration, the battery cells 221 are independent of each other. When thermal runaway occurs in one battery cell 221, other battery cells 221 are not affected by the presence of the separation holes 262, thereby preventing thermal runaway from spreading.Referring to FIGS. 11 to 14, the battery pack further includes a plurality of bus bar units. The bus bar units include a plurality of first conductive rows 23235 spaced apart in a first direction X. Each of the first conductive rows 23235 includes a plurality of first conductive elements arranged and connected to each other in a second direction Y. The first conductive member includes a first connection portion 23238, and a first conductive unit 23231 and a second conductive unit 23232 respectively disposed at both ends of the first connection portion 23238. The bottom surface of the first conductive unit 23231 is provided with a protrusion 2321 configured to connect to a positive electrode of one of two adjacent battery cells 221 in the first direction X, and the bottom surface of the second conductive unit 23232 is provided with an abutting portion 2322 configured to connect to a negative electrode of the other of the two adjacent battery cells 221 in the first direction X.In the present embodiment, the first conductive row 23235 includes four first conductive elements arranged and connected to each other in the second direction Y. The cell group 22 includes a plurality of battery cell rows arranged in the second direction Y, and the four first conductive members respectively cooperate with the battery cells 221 at respective positions in four battery cell rows, so that the battery cells 221 at respective positions in the four battery cell rows are connected in parallel by one of the first conductive rows 23235. The first conductive unit 23231 of each first conductive element is connected to the positive electrode of an adjacent battery cell 221 in a battery cell row, and the second conductive unit 23232 is connected to the negative electrode of another adjacent battery cell 221 in the same battery cell row. That is, two adjacent battery cells 221 in the same battery cell row are connected in series by the first conductive member.Further, each of the bus bar units further includes a second conductive row 23236 and a third conductive row 23237 provided at both ends of each of the first conductive rows 23235. The second conductive row 23236 includes a plurality of second conductive elements arranged and connected to each other in the second direction Y. The second conductive element includes a second connection portion 23239 and a third conductive unit 23233 disposed on a side of the second connection portion 23239 facing the first conductive row 23235. The third conductive row 23237 includes a plurality of third conductive elements arranged and connected to each other in the second direction Y. The third conductive element includes a third connection portion 23240 and a fourth conductive unit 23240 disposed on a side of the third connection portion 23240 facing the first conductive row 23235.In the present embodiment, the second conductive row 23236 includes four second conductive elements arranged and connected to each other in the second direction Y. The four second conductive elements respectively cooperate with the battery cells 221 at the corresponding positions in four battery cell rows, such that the battery cells 221 at the corresponding positions in the four battery cell rows are connected in parallel by one of the second conductive rows 23236. Similarly, the third conductive row 23237 includes four third conductive elements arranged and connected to each other in the second direction Y. The four third conductive members respectively cooperate with the battery cells 221 at the respective positions in four battery cell rows, so that the battery cells 221 at the respective positions in the four battery cell rows are connected in parallel by one of the third conductive rows 23237.Referring back to FIG. 11, the present disclosure provides a plurality of bus bar units arranged at intervals in the second direction Y. Each of the bus bar units includes two end bus bars disposed at both edges and a plurality of intermediate bus bars between the two end bus bars. The second conductive row 23236 disposed at one end of one of the end bus bars is connected to the third conductive row 23237 of adjacent one of the intermediate bus bars, and the third conductive row 23237 disposed at the other end of the one of the end bus bars is connected to an output electrode connector 7. The third conductive row 23237 disposed at one end of another end bus bar is connected to the second conductive row 23236 of adjacent ones of the intermediate bus bars, and the second conductive row 23236 disposed at the other end of the other end bus bar is connected to another output electrode connector 7. Further, the second conductive row 23236 in one of the intermediate bus bars is connected to the third conductive row 23237 on the same side in adjacent one of the intermediate bus bars, and the third conductive row 23237 in the one of the intermediate bus bars is connected to the second conductive row 23236 on the same side in another adjacent one of the intermediate bus bars, thereby realizing the series connection of the plurality of bus bar units.Referring to FIG. 10, the battery pack further includes an insulating cover 231. The insulating cover 231 is provided with a plurality of hollow first observation holes 2311 at the positions corresponding to the protrusions 2321 on the bus bars 232. The first observation holes 2311 have a circular shape so as to correspond to the shape of the protrusions 2321, thereby facilitating observation as to whether the protrusions 2321 are in sufficient contact with the positive electrodes of the battery cells 221. The insulating cover 231 is further provided with a plurality of hollow second observation holes 2312 at the positions corresponding to the abutment portions 2322 on the bus bar 232. The second observation holes 2312 have an arc shape so as to correspond to the size of the abutment portions 2322, thereby facilitating observation as to whether the abutment portions 2322 are sufficiently in contact with the negative electrodes of the battery cells 221.Referring to FIGS. 5 to 7, the housing 1 includes a housing frame (11) 11, a bottom protection plate 13, and an inner beam 12. the housing frame (11) 11 and the bottom protection plate 13 form a chamber structure, and the inner beam 12 is disposed in the chamber structure and is fixed to the housing frame (11) 11 and / or the bottom protection plate 13. The inner beam 12 divides the chamber structure into a first chamber structure 11 cand a second chamber structure 11 dconfigured to place an electrical element 14. Moreover, the housing 1 comprises an upper cover 114 which can cover the housing frame (11) 11 to seal the chamber structure.Referring again to FIGS. 5 to 7, two ends of the inner beam 12 are connected to the inner side walls of two first side beams 111, respectively, so that the inner beam 12 sequentially divides the case frame (11) 11 into a first frame 11a and a second frame 11b. Moreover, the bottom protection plate 13 includes a first bottom protection plate 131 covering the bottom of the first frame 11 aand a second bottom protection plate 132 covering the bottom of the second frame 11 b. The first frame 11 atogether with the first bottom protection plate 131 forms a first chamber structure 11 cconfigured to receive the battery module 2, and the second frame 11 btogether with the second bottom protection plate 132 forms a second chamber structure 11 dconfigured to receive the electrical element 14.The ground protection plate 13 is divided into the first ground protection plate 131 and the second ground protection plate 132, so that when an electric element 14 fails and needs to be repaired, the second ground protection plate 132 is removed and the failed electric element 14 is disassembled for replacement or maintenance, which eliminates the need to remove the entire battery pack, thereby reducing the cost for maintenance and replacement of the electric element 14 and improving the maintenance efficiency. A liquid tube 133 is disposed in the inner beam 12 and configured to communicate with the liquid cooling assembly 26 in the battery module 2. Accordingly, the inner beam 12 may be formed at the same height as the first side beam 111. That is, the surface of the inner beam 12 facing away from the bottom protection plate 13 is flush with the surface of the housing frame ( 11) 11 facing away from the bottom protection plate 13, whereby the rigidity of the inner beam 12 is improved and in turn the overall rigidity of the housing frame ( 11) 11 is improved.Further, a first sealing member 151 is provided between the first bottom protection plate 131 and the first frame 11 a, and a second sealing member 152 is provided between the second bottom protection plate 132 and the second frame 11 b. Therefore, the sealing between the first and second bottom protection plates 131 and 132 and the case frame (11) 11 can be achieved by the first sealing member 151 and the second sealing member 152, respectively. The battery module 2 and the case 1 are bonded and sealed by the first foam adhesive 3, thereby forming a double seal structure to reduce the risk of gas leakage.Referring to FIGS. 6 to 7, a positioning rib 16 is disposed on the inner side wall of the first side beam 111 and extends along the longitudinal direction of the first side beam 111. One end of the positioning rib 16 is connected to a side surface of the inner beam 12, and another end of the positioning rib 16 is connected to a side surface of the second side beam 112. The use of the positioning rib 16 can facilitate the positioning of the inner beam 12 and improve the mounting efficiency of the inner beam 12. Meanwhile, the use of the positioning rib 16 further improves the support strength of the first side beam 111.Referring to Figs. 4 to 6 and 24, the housing 1 further comprises one or more output electrode bases 19 disposed on the inner beam 12. The output electrode base 19 is configured to connect to the output electrode connector 7 in the battery module 2. The output electrode base 19 includes a resin base, a copper holder disposed on the top surface of the resin base, and two nuts spaced in the copper holder. The output electrode connectors 7 are connected to the nuts of the output electrode base 19 by bolts, so that the output electrode connectors 7 are fixed to the copper holder to realize electrical connection. The adapter holders 8 are arranged on a side wall of the inner beam 12 and are located in the second chamber structure. The adapter holder 8 is connected to a first adapter disk 81 which is connected to another nut of the output electrode base 19 by a bolt, so that the first adapter disk 81 is fixed to the copper holder for electrical connection. The first adapter disk 81 is, for example, a high-voltage copper busbar.Further, the electrical element 14 is a BUD system, and a second adapter disk 82 is connected to the BUD system. The second adapter disk 82 is connected to the first adapter disk 81 for electrical connection. For example, the second adapter disk 82 is a high voltage copper bus bar. As a result, the output electrode connectors 7 on the battery module 2 are electrically connected to the BUD system sequentially through the copper holder of the output electrode base 19, the first adapter disk 81, and the second adapter disk 82.Embodiment 2Referring to FIGS. 1 to 16, the present disclosure includes a battery case having a case frame (11) 11. the case frame (11) 11 includes two first side beams 111 arranged in parallel at intervals in the left-right direction and in the form of an elongated rod, and two second side beams 112 arranged in parallel at intervals in the left-right direction and in the form of an elongated rod. The two first side beams 111 and the two second side beams 112 are spliced and welded together by slot-and-pin joint structures 113 to form a rectangular case frame (11) 11. The slot-pin connecting structure 113 includes a convex pin 1131 and a concave slot 1132 that are fitted together. The convex pin 1131 is disposed at the ends of the first side beam 111, and the concave slot 1132 is disposed at the ends of the second side beam 112. Thus, the mutual splicing of the first side beams 111 and the second side beams 112 can be realized by the mutual splicing of the convex pins 1131 and the concave slits 1132.The configuration of the slot-and-pin joint structures 113 for splicing and welding the first side beams 111 and the second side beams 112 of the case frame (11) 11 improves the strength of the joints between the first side beams 111 and the second side beams 112 and further improves the overall strength of the case frame (11) 11.In other embodiments, the first side beams 111 and the second side beams 112 may be provided in an L-shape or a C-shape, which is not limited thereto.The battery case 1 further includes a plurality of reinforcing beams 17 spaced in the second frame 11 band a plurality of reinforcing plates 18 spaced in the first frame 11 a. Each reinforcing beam 17 is arranged parallel to the first side beam 111, and each reinforcing plate 18 is arranged parallel to the second side beam. One end of the reinforcing beam 17 is connected to the inner side wall of the second side beam 112, and the other end of the reinforcing beam 17 is connected to a side wall of the inner beam 12. One end of the reinforcing plate 18 is connected to the positioning rib 16 in one of the first side beams 111, and the other end of the reinforcing plate 18 is connected to the positioning rib 16 in the other of the first side beams 111.Therefore, by providing a plurality of reinforcing plates 18 in the first frame 11 aand a plurality of reinforcing beams 17 in the second frame 11 b, the strength of the battery case 1 can be improved.The present disclosure further provides a battery pack including the battery case 1, the battery module 2, and the electrical element 14, wherein the battery module 2 is mounted in the first chamber structure 11 cin the battery case 1 by the first foam adhesive 3, and the electrical element 14 is mounted in the second chamber structure 11 din the battery case 1.Embodiment 3Referring to FIGS. 1 to 17, the present disclosure provides the battery module 2 including a cell group 22, a CCS assembly 23 disposed on the upper side of the cell group 22, and the base plate 24 disposed on the lower side of the cell group 22. The cell group 22 includes a plurality of battery cells 221. The CCS assembly 23 includes the bus bars 232 and the insulation cover 231 covering the top of the bus bars 232, wherein the plurality of battery cells 221 are connected in series or in parallel in the bus bars 232. The base plate 24 is connected to the insulating cover 231.The bus bars 232 include a plurality of positive conductive units and a plurality of negative conductive units. The bottom surface of the positive conductive units is provided with the protrusions 2321, and the bottom surface of the negative conductive units is provided with the abutting portions 2322. When the insulating cover 231 is connected and fixed to the base plate 24, the insulating cover 231 drives the protrusions 2321 on the bus bars 232 to generate the interference connection to the positive electrodes of the plurality of battery cells 221 and deformation, and drives the abutting portions 2322 on the bus bars 232 to generate the interference connection to the negative electrodes of the plurality of battery cells 221 and deformation, thereby realizing the connection between the bus bars 232 and the cell group 22.As a result, this welding-free joining method provides the connection between the CCS assembly 23 and the cell group 22, thus avoiding the inherent errors of the welding process, improving the reliability of product performance, and eliminating the need for welding equipment and welding professionals, thereby saving energy and labor costs. Moreover, the use of the weld-free connection is convenient in maintenance and disassembly.The insulating cover 231 is made of a rubber or a plastic. In other embodiments, the insulating cover 231 may be made of a composite having higher mechanical strength, electric pressure resistance, or temperature and flame resistance. The insulating cover 231 may be simply used as an insulating plate on the battery module 2, or may be part of the outer package of the entire battery pack.In the present embodiment, the battery cell 221 is a cycle-type cell, and its positive electrode is the protrusion 2321 on the upper side of the battery cell 221, and its negative electrode is a remaining shell of the battery cell 221 except for the upper protrusion 2321 and the lower side.Specifically, the bus bars 232 include the plurality of bus bar units arranged in the Y direction. The bus bar units include the plurality of first conductive rows 23235 arranged at intervals in the X direction. Each of the first conductive rows 23235 includes the plurality of first conductive elements arranged and connected to each other in the Y direction. The first conductive member includes the first connection portion 23288, and the first positive conductive unit and the first negative conductive unit disposed at both ends of the first connection portion 23238, respectively. The bottom surface of the first positive conductive unit is provided with the protrusion 2321 configured to connect to the positive electrode of one of two adjacent battery cells 221 in the X direction, and the bottom surface of the first negative conductive unit is provided with the abutting portion 2322 configured to connect to the negative electrode of the other of two adjacent battery cells 221 in the X direction.Further, the bus bar unit further includes the second conductive row 23236 and the third conductive row 23237 provided at both ends of each of the first conductive rows 23235, respectively. The second conductive row 23236 includes the plurality of second conductive elements arranged and connected to each other in the Y direction. The second conductive element includes the second connection portion 23239 and the second positive conductive unit located on a side of the second connection portion 23239 facing the first conductive row 23235. The third conductive row 23237 includes the plurality of third conductive elements arranged and connected to each other in the Y direction. The third conductive element includes the third connection portion 23240 and the second negative conductive unit disposed on a side of the third connection portion 23240 facing the first conductive row 23235.The insulating cover 231 covers the upper surfaces of the four surrounding beams and seals the cavity. The insulation cover 231 is connected and fixed to the base plate 24 by a first snap-in structure, and to the surrounding beams by a second snap-in structure. Specifically, the first snap-in structure includes a first male buckle and a first groove that are engaged with each other, the first groove being provided on the insulating cover 231, and the first male buckle being provided on the base plate 24 and passing through a gap between the battery cells 221. Thereby, the connection between the insulation cover 231 and the base plate 24 can be realized by fixing the first male buckle to the first groove. The second snap-in structure includes a second male buckle and a second groove engaged with each other, the second groove being provided at the edge of the insulation cover 231, and the second male buckle being provided on the surrounding beam. Thereby, the connection between the insulation cover 231 and the surrounding beams can be realized by fixing the second male buckle to the second groove.In the present embodiment, the first male buckle and the second male buckle have the same structure, and the first groove and the second groove also have the same structure. The length of the first male buckle is longer than that of the second male buckle.In other embodiments, the positions of the first male buckle and the first groove may be interchanged. That is, the first groove is provided on the base plate 24, and the first male buckle is provided on the insulating cover 231 as long as this configuration achieves the same technical effect. Also, the positions of the second male buckle and the second groove may be interchanged. That is, the second male buckle is provided on the surrounding beam, and the second groove is provided on the insulating cover 231 as long as this configuration can also achieve the same technical effect, which is not limited thereto.The surrounding beams are disposed at the periphery of the base plate 24 and bonded and fixed by the first foam adhesive 3 so that the surrounding beams function as a barrier to the adhesive, and form an integral module with the insulation cover 231 on the CCS assembly 23 and the base plate 24, thereby preventing the first foam adhesive 3 from overflowing.The battery module 2 further includes the heat insulating layer 28 provided on the base plate 24. For example, the thermal barrier coating 28 is a mica paper bonded to the top and bottom surfaces of the base plate 24. As a result, the configuration of the mica paper on the upper side and lower side of the base plate 24 can prevent the base plate 24 from being damaged by thermal runaway, and in turn prevent influence on the battery cells 22.The present disclosure also includes a battery pack including a housing 1 and a battery module 2 as described above, and a BUD system provided in the housing 1. The battery module 2 is provided in the first frame 11 a, and the BUD system is provided in the second frame 11 b.Embodiment 4Referring to FIGS. 1 to 17, the present disclosure provides a CCS assembly 23 including bus bars 232 and an insulating cover 231 covering the bus bars 232. The bus bars 232 include a plurality of bus bar units arranged at intervals along the second direction Y. The bus bar unit includes a first conductive unit 23231 and a second conductive unit 23232. The first conductive unit 23231 is provided with the protrusion 2321 configured to abut on the first electrode of the battery cell 221, and the second conductive unit 23232 is provided with the abutting portion 2322 configured to abut on the second electrode of the battery cell 221. For example, the abutting portion 2322 is an annular rib.In the present embodiment, the battery cell 221 is a cycler cell, and the first electrode is a positive electrode of the battery cell 221, that is, the protrusion 2321 on the upper surface of the battery cell 221. The second electrode is the negative electrode of the battery cell, that is, the remaining shell of the battery cell 221 except for the upper protrusion and the lower surface.The insulating cover 231 is configured to be connected and fixed to a support 4 of the battery pack made of a rubber or resin. When the insulating cover 231 is connected and fixed to the support 4, the insulating cover 231 drives the protrusions 2321 on the bus bars 232 to generate the interference connection to the upper surface of the plurality of battery cells 221 and deformation, and drives the protrusion ribs on the bus bars 232 to generate the interference connection to the remaining shell except the upper surface of the battery cells 221 and deformation, thereby realizing the connection between the bus bars 232 and the electrodes of the battery cells 221.In other exemplary embodiments, the protrusion rib may be arranged on the outer edge of the upper side of the battery cell 221 and forms the interference connection with one another. The protrusion ribs may have an arc shape or other shapes, which are not limited thereto.According to some embodiments of the present disclosure, the connection between the CCS assembly 23 and the battery module 2 is simple in structure and convenient in maintenance and disassembly.The insulating cover 231 is made of a rubber or a plastic. In other embodiments, the insulating cover 231 may be made of a composite having higher mechanical strength, electric pressure resistance, or temperature and flame resistance. The insulating cover 231 may be simply used as an insulating plate of the battery pack, or may be part of the outer package of the entire battery pack.The present disclosure also provides the battery pack including the CCS assembly 23, the battery module 2, and the support 4. The support 4 includes an insulating plate 41 and four insulating beams 42 disposed around the insulating plate 41, the insulating plate 41 and the insulating beams 42 being made of a rubber or a plastic. The insulating cover 231 is fixed to the insulating plate 41 and the four insulating beams 42 by a snap structure 25.The battery module 2 includes the plurality of battery cell assemblies corresponding to the plurality of bus bar units. The battery cell assembly includes the plurality of battery cell rows spaced along the second direction Y. The battery cell row includes a plurality of battery cells 221 arranged at intervals along the first direction X.Embodiment 5Referring to FIGS. 1-24, the present disclosure provides the output electrode bases 19 configured to provide insulation protection for the output electrode connector 7 in a battery module. Specifically, the output electrode base 19 includes the insulating base 5 and a conductive bracket 6 fixed to the insulating base 5. The conductive holder 6 is provided with connection members 61, and a part of the connection member 61 is located in the insulating base 5. moreover, at least one of the connection member 61 and the conductive holder 6 has a step structure configured to limit the movement of the connection member 61 in the axial direction, to prevent the connection member 61 from being peeled off, and to in turn prevent the locking reliability from being impaired.The connecting element 61 is a press rivet nut. The upper surface of the rivet nut is provided with an annular flange 611 having a diameter smaller than that of the nut of the rivet nut to form a step structure. The step structure is embedded in the conductive holder 6 to limit the movement of the connecting member 61 in the axial direction.When the connecting member 61 is subjected to a force, the step structure makes the connecting member 61 less prone to loosening in the axial direction, thereby improving the torsion resistance and the extraction resistance of the connecting member 61 on the conductive bracket 6, and further improving the connection reliability between the connecting member 61 and the conductive bracket 6.In other embodiments, a step groove may be provided in the conductive holder 6 to form a step structure. The connecting member 61 may engage with the step structure to limit the movement of the connecting member 61 in the axial direction, thereby achieving the same technical effect, which is not limited thereto.The insulating base 5 may be made of a rubber or plastic. The conductive mount 6 is a copper mount. The press nut is fixed in the conductive bracket 6 by a riveting process. An upper part of the press nut is embedded in the conductive bracket 6, and a lower part of the press nut passes through the conductive bracket 6 and extends into the insulating base 5.The connecting members 61 that play a role of connecting and fixing the output electrode connector 7 enable the output electrode connector 7 to be fixed to the insulating base 5. the insulating base 5 is an injection molded rubber or plastic structure to provide the output electrode connector 7 with insulation protection.Further, the conductive holder 6 is integrally injection molded with the insulating base 5 to allow attachment and connection between the conductive holder 6 and the insulating base 5. Both sides of the conductive holder 6 are bent inward to form a ring structure whose inside forms a cavity 62. An upper part of the connecting members 61 is located in the cavity 62, and the remaining portion in the cavity 62, except for the connecting members 61, is filled with a rubber or plastic material. Moreover, the center of the top surface of the conductive holder 6 is buried to form a groove body 64. The groove body 64 is also filled with a rubber or plastic material.The cavity 62 and the groove body 64 in the conductive holder 6 are filled with a rubber or plastic material, thereby increasing the contact area between the conductive holder 6 and the insulating base 5 and further improving the connection reliability between the conductive holder 6 and the insulating base 5.Further, the third male buckles 191 are disposed at the lower side of the insulating base 5. The third male buckle 191 includes two elastic bulges disposed at intervals that can be moved upon application of force, so that the elastic bulges can be clamped in third female grooves 1211, whereby the insulating base 5 can be fixed to the battery module frame or the housing 1.In addition, limiting plates 51 are individually disposed on both sides of the insulating base 5 and integrally extend upward. The output electrode connector 7 is clamped between the two limiting plates 51 to limit the position of the connector 7, thereby preventing the output electrode connector 7 from being displaced when mounted on the output electrode base 19 and preventing short circuit.The present disclosure also includes a battery pack including a housing 1, a battery module (not illustrated) disposed in the housing 1, and an output electrode base 19 as described above.Mounting grooves 121 are disposed on the inner beam 12, and the output electrode bases 19 are disposed in the mounting grooves 121. The mounting groove 121 is provided with a third woven groove 1211. The third male buckle 191 on the output electrode base 19 is snap-fitted to the third female groove 1211 so that the output electrode base 19 is mounted on the inner beam 12.In other embodiments, it is also possible to exchange the positions of the third male buckles 191 and the third female grooves 1211. That is, the third male buckles 191 are disposed in the mounting groove 121, and the third female grooves 1211 are disposed on the insulating base 5, which is not limited thereto.Further, each of the output electrode connectors 7 is provided with a through hole through which a fixing member for connection to the connecting member 61 passes, so that the output electrode connectors 7 are fixed to the output electrode base 19. In the present embodiment, the fixing member is a screw that is threadedly engaged with the press nut.Specifically, two parallel connection members 61 are disposed on the insulating base 5. One of the connecting members 61 is connected to the output electrode connector 7 by a screw, the other of the connecting members 61 is connected to one end of the first adapter plate 81 by a screw. The other end of the first adapter disk 81 is connected to the second adapter disk 82, which in turn is connected to the BUD system.In the present embodiment, both the first adapter plate 81 and the second adapter plate 82 are a high-voltage copper bus bar.

Claims

A battery pack, comprising: a housing (1) comprising a first chamber structure (11c); and at least one battery module (2) disposed in the first chamber structure (11c), wherein the battery module (2) comprises a cell group (22) and a surrounding frame (21) configured to surround the cell group (22), wherein the surrounding frame (21) is detachably connected to the housing (1).The battery pack according to claim 1, wherein the surrounding frame (21) is connected to the housing (1) by at least one of a fastening member and a snap-in structure.The battery pack according to claim 2, wherein the fixing member includes a first foam adhesive (3) soluble in an adhesive remover, and a side of the surrounding frame (21) facing away from the cell group (22) is provided with an adhesive retaining groove (213), and the first foam adhesive (3) is filled in the adhesive retaining groove (213) and adhered to the case (1).The battery pack according to any one of claims 1 to 3, wherein the battery module (2) further comprises a base plate (24) at a bottom of the cell group (22), and the base plate (24) and the surrounding frame (21) form a cavity, and the cell group (22) is disposed in the cavity.The battery pack according to claim 4, wherein the battery module (2) further comprises a CCS assembly (23) disposed on the top of the cell group (22), wherein the CCS assembly (23) comprises a bus bar (232) and an insulating cover (231) covering a side of the bus bar (232) facing away from the cell group (22), and wherein the bus bar (232) is connected in series or in parallel to a plurality of battery cells (221) in the cell group (22); and wherein the insulating cover (231) is connected to at least one of the base plate (24) and the surrounding frame (21) through a snap structure (25).The battery pack of claim 4, wherein the battery pack satisfies at least one of the following conditions: the battery pack further comprises a second foam adhesive (27) disposed in the cavity, wherein the second foam adhesive (27) bonds the cell group (22), the surrounding frame (21), and the base plate (24) together, and the battery pack further comprises one or more thermal barrier layers (28) disposed on the base plate (24), and the thermal barrier layers (28) are disposed on at least one of a side of the base plate (24) facing the cell group (22) and a side of the base plate (24) facing away from the cell group (22).The battery pack according to any one of claims 1 to 3, wherein the battery module (2) further comprises a liquid cooling assembly (26) disposed in the cavity, wherein the liquid cooling assembly (26) comprises a plurality of liquid cooling blocks (261) in a serpentine shape, and a plurality of separation holes (262) independent from each other is defined between adjacent liquid cooling blocks (261) and is configured to separate adjacent battery cells (221) in the cell group (22) and wrap the battery cells (221).The battery pack according to claim 5, wherein the bus bar (232) comprises a plurality of bus bar units (2323), and each of the bus bar units (2323) comprises a first conductive unit (23231) and a second conductive unit (23232); wherein the first conductive unit (23231) is provided with a protrusion (2321) and the second conductive unit (23232) is provided with an abutting portion (2322); wherein the battery pack satisfies at least one of the following conditions: the insulating cover (231) is connected and fixed to the base plate (24), and through the insulating cover (231), the protrusion (2321) of the bus bar (232) abuts a first electrode of the corresponding battery cell (221) in the cell group (22), and the abutting portion (2322) of the bus bar (232) abuts a second electrode of the corresponding battery cell (221) in the cell group (22), and the insulating cover (231) is connected and fixed to the surrounding frame (21), and through the insulating cover (231), the protrusion (2321) of the bus bar (232) abuts a first electrode of the corresponding battery cell (221), and the abutting portion (2322) of the bus bar (232) abuts a second electrode of the corresponding battery cell (221).The battery pack according to claim 8, wherein the battery pack satisfies at least one of: hollow first observation holes (2311) are disposed on the insulating cover (231), and each of the first observation holes (2311) corresponds to the protrusion (2321); or hollow second observation holes (2312) are disposed on the insulating cover (231), and each of the second observation holes (2312) corresponds to the abutment portion (2322).The battery pack according to any one of claims 1 to 3, wherein the case (1) comprises a case frame (11), a bottom protection plate (13), and an inner beam (12), wherein the case frame (11) and the bottom protection plate (13) are connected to form the chamber structure, and the inner beam (12) is disposed in the chamber structure and fixed to at least one of the case frame (11) and the bottom protection plate (13); and a liquid pipe (133) is disposed in the inner beam (12), both ends of the inner beam (12) are connected to the case frame (11), and a side surface of the inner beam (12) facing away from the bottom protection plate (13) is flush with a side surface of the case frame (11) facing away from the bottom protection plate (13).The battery pack according to claim 10, wherein the inner beam (12) divides the case frame (11) into a first frame (11a) and a second frame (11b) independent of each other, wherein the bottom protection plate (13) comprises a first bottom protection plate (131) for covering a bottom surface of the first frame (11a) and a second bottom protection plate (132) for covering a bottom surface of the second frame (11b), wherein the first frame (11a) and the first bottom protection plate (131) form the first chamber structure (11c), and the second frame (11b) and the second bottom protection plate (132) form a second chamber structure (11d), and a first sealing member (151) is provided between the first bottom protection plate (131) and the first frame (11a), and a second sealing member (152) is provided between the second bottom protection plate (132) and the second frame (11b).The battery pack according to claim 11, wherein a positioning rib (16) is disposed on an inner side wall of the case frame (11), and an end of the positioning rib (16) is connected to a side wall of the inner beam (12).The battery pack according to claim 12, wherein the battery pack satisfies at least one of the following conditions: a plurality of reinforcing beams (17) are disposed on the case frame (11), one end of each reinforcing beam (17) is connected to the case frame (11), and another end of each reinforcing beam (17) is connected to a side of the inner beam facing away from the positioning rib (16), and a plurality of reinforcing plates (18) are disposed on the case frame (11) at intervals, and both ends of each reinforcing plate (18) are respectively connected to the positioning ribs (16) on different sides of the case frame (11).The battery pack according to any one of claims 1 to 13, wherein the battery pack further comprises: an insulating base disposed on the housing; and a conductive bracket fixed to the insulating base and electrically connected to the battery module; wherein connection members are provided on the conductive bracket, and at least one of the connection members and the conductive bracket has a step structure to limit the axial movement of the connection members.The battery pack according to claim 14, wherein the battery pack satisfies at least one of the following conditions: at least a part of each of the connection members is located in the insulating base, and the connection members are riveted to the conductive bracket, and each of the connection members includes a press rivet nut, and an upper surface of the press rivet nut is provided with an annular flange to form the step structure, a cavity is disposed in the conductive bracket, at least a part of each connection member is disposed in the cavity, and the conductive bracket is filled with a material of the insulating base, the conductive bracket has an annular structure, a part of the conductive bracket is buried to form a groove body, and the groove body is filled with a material of the insulating base, and the battery pack further includes an output electrode connection piece, and the output electrode connector is connected to the connectors by a fixing member to be fixed to an output electrode base, two limiting plates are disposed on opposite sides of the insulating base to limit the output electrode connector, and the output electrode connector is electrically connected to the battery module and the conductive bracket.

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