Battery pack and vehicle

Abstract

The present application discloses a battery pack and a vehicle. The battery pack comprises: a case in which a first cavity structure is formed; and at least one battery module arranged in the first cavity structure. The battery module at least comprises a cell group and an enclosure frame for defining the cell group, wherein the enclosure frame is detachably connected to the case.

Description

Battery pack and vehicle

[0001] This application claims priority to the following Chinese patent applications submitted to the China Patent Office: Application date 20230830, application number 202311111571.8, application name is A CTP battery pack and automobile; Application date 20230830, application number 202322353429.6, application name is An output pole base and battery pack; Application date 20230830, application number 202322353418.8, application name is A CCS component and battery pack; Application date 20230830, application number 202322353410.1, application name is A battery module and battery pack; Application date 20230830, application number 202322353439.X, application name is A battery box and battery pack. The entire contents of the above applications are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery pack and a vehicle. Background Art

[0003] The battery system is a core component of new energy vehicles. Traditional battery systems typically package cells into modules using external structural components, which are then integrated into the battery case. This cell grouping method is not only structurally complex but also cumbersome, time-consuming, and labor-intensive to assemble. Furthermore, the overall package strength is weak.

[0004] To address this issue, the CTP (Cell to Pack) battery pack was developed. This bypasses the production of cell modules and directly builds the battery pack from the cells, eliminating the intermediate steps and effectively improving the battery pack's space utilization and energy density. Currently, most CTP battery packs use a large amount of glue to directly bond multiple cells to the housing, making the module impossible to disassemble. If a cell within a module fails, the entire battery pack must be replaced, significantly increasing repair costs. SUMMARY OF THE INVENTION

[0005] The present application provides a battery pack and a vehicle to solve the above-mentioned technical problems.

[0006] The present application provides a battery pack, comprising:

[0007] a box body, wherein a first cavity structure is formed inside the box body;

[0008] At least one battery module is disposed in the first cavity structure; the battery module comprises at least a battery cell group and an enclosure frame enclosing the battery cell group, and the enclosure frame is detachably connected to the box.

[0009] The present application also provides a car, which includes the battery pack as described above. Beneficial effects

[0010] The beneficial effects of the present application are as follows: the battery pack provided by the present application has a cell group surrounded by an enclosure frame, and the enclosure frame is detachably connected to the box body. With this arrangement, when a cell group fails, the faulty cell group can be removed and repaired and replaced by simply removing the enclosure frame, without having to replace the entire battery pack, thereby reducing repair costs and improving repair efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG1 is a schematic structural diagram of the battery pack of the present application;

[0012] FIG2 is a first exploded schematic diagram of the battery pack of the present application;

[0013] FIG3 is a second exploded schematic diagram of the battery pack of the present application;

[0014] FIG4 is a third exploded schematic diagram of the battery pack of the present application;

[0015] FIG5 is a schematic diagram of the structure of the box in the battery pack of the present application;

[0016] FIG6 is an exploded schematic diagram of a box in the battery pack of the present application;

[0017] FIG7 is an exploded schematic diagram of the box frame in the box of the present application;

[0018] FIG8 is a schematic diagram of the structure of a cell group in the battery pack of the present application;

[0019] FIG9 is a schematic diagram of an explosion of a battery cell group in the battery pack of the present application;

[0020] FIG10 is an exploded schematic diagram of the CCS assembly in the battery cell group of the present application;

[0021] FIG11 is a schematic diagram of the structure of the busbar in the CCS assembly of the present application;

[0022] FIG12 is a schematic structural diagram of the first conductive member in the busbar of the present application;

[0023] FIG13 is a schematic structural diagram of the second conductive member in the busbar of the present application;

[0024] FIG14 is a schematic structural diagram of the third conductive member in the busbar of the present application;

[0025] FIG15 is a schematic diagram of the assembly of the bottom plate and several surrounding beams in the battery cell group of the present application.

[0026] FIG16 is a schematic structural diagram of the battery pack of the present application;

[0027] FIG17 is a schematic diagram of the structure of the battery pack of the present application after the top cover of the box is hidden;

[0028] FIG18 is an exploded schematic diagram of the output pole base of the present application;

[0029] FIG19 is a schematic structural diagram of the output pole base of the present application;

[0030] FIG20 is a schematic diagram of the bottom of the output pole base of the present application;

[0031] FIG21 is a top view of the output pole base of the present application;

[0032] FIG22 is a schematic cross-sectional view taken along line AA in FIG21 ;

[0033] FIG23 is an exploded schematic diagram of a portion of the battery pack structure of the present application;

[0034] Figure 24 is an exploded schematic diagram of the battery box and output pole base in the battery pack of this application.

[0035] Description of reference numerals:

[0036] 1. Box; 11. Box frame; 11a. First frame; 11b. Second frame; 11c. First cavity structure; 11d. Second cavity structure; 111. First side beam; 112. Second side beam; 113. Mortise and tenon joint structure; 1131. Convex block; 1132. Concave groove; 114. Upper cover; 12. Inner beam; 121. Mounting groove; 1221. Third clamping hole; 13. Bottom guard plate; 131. First bottom guard plate; 132. Second bottom guard plate; 133. Water pipe; 14. Electrical components Components; 151, first sealing ring; 152, second sealing ring; 16, positioning rib; 17, reinforcement beam; 18, reinforcement plate; 19, output stage base; 191, third buckle; 2, battery module; 21, enclosing frame; 211, first enclosing beam; 212, second enclosing beam; 213, glue storage tank; 22, battery cell group; 221, battery cell; 23, CCS assembly; 231, insulation cover; 2311, first observation hole; 2312, second observation hole; 232, busbar; 2321, convex 2322, abutting portion; 2323, busbar 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 connecting portion; 23239, second connecting portion; 23240, third connecting portion; 2324, connecting piece; 24, bottom plate; 25, snap-fit ​​structure; 251 , snap fastener; 252, snap hole; 26, liquid cooling assembly; 261, liquid cooling plate; 262, partition hole; 27, second foam glue; 28, thermal insulation layer; 3, first foam glue; 4, plastic bracket; 41, plastic bottom plate; 42, plastic beam; 5, insulating base; 51, limit plate; 6, conductive bracket; 61, connector; 611, annular flange; 612, step structure; 62, cavity; 64, slot body; 7, output stage connecting piece; 8, adapter bracket; 81, first adapter; 82, second adapter. Modes for Carrying Out the Invention

[0037] Example 1

[0038] 1-15 , the present application provides a battery pack, including a box body 1 and at least one battery module 2 disposed in the box body 1 .

[0039] Specifically, the housing 1 can be rectangular. A first cavity structure 11c can be formed on one side of the housing 1. At least one battery module 2 is placed within the first cavity structure 11c. The battery module 2 includes at least a cell group 22 and an enclosure frame 21 surrounding the cell group 22. The enclosure frame 21 is detachably connected to the housing 1.

[0040] Specifically, the battery pack further includes a fixing member connecting the enclosing frame 21 and the housing 1. Preferably, the fixing member is a first foamed adhesive 3 that can be dissolved by a dissolving agent. A glue storage tank 213 is defined on the side of the enclosing frame 21 facing away from the battery cell group 22. A portion of the first foamed adhesive 3 is filled in the glue storage tank 213, and the other portion of the first foamed adhesive 3 is glued to the housing 1.

[0041] Thus, the outer periphery of the cell group 22 is enclosed by the enclosing frame 21, and the enclosing frame 21 is bonded and fixed to the housing 1 via the first foamed adhesive 3. If a cell group 22 malfunctions, the first foamed adhesive 3 can be removed for repair and replacement simply by dissolving it with a dissolving agent. Furthermore, a glue reservoir 213 is provided on the side of the enclosing frame 21 facing away from the cell group 22, allowing the first foamed adhesive 3 to form foamed adhesive columns of varying shapes during the foaming process, thereby improving bonding strength.

[0042] Of course, in other embodiments, the enclosing frame 21 can also be connected to the box body in a snap-fit ​​manner, that is, snaps are provided on the outside of the enclosing frame 21, and corresponding snap holes are provided on the side walls of the box body 1. The snaps are snapped into the snap holes to achieve the connection between the enclosing frame 21 and the box body 1. This fixing method is also convenient for disassembly and assembly. When the battery pack 22 fails, the enclosing frame 21 can also be disassembled to remove the battery pack 22 for repair and replacement, so this is not limited here.

[0043] Specifically, referring to Figures 8-9, the enclosing frame 21 is formed by splicing together two first enclosing beams 211 arranged in parallel at intervals along the front-to-back direction and two second enclosing beams 212 arranged in parallel at intervals along the left-to-right direction. Specifically, the two first enclosing beams 211 and the two second enclosing beams 212 are spliced ​​together by a mortise and tenon structure. The mortise and tenon structure may include a convex block and a concave groove that are plugged into each other. For example, the concave groove may be provided at the end of the first enclosing beam 211, and the convex block may be provided at the end of the enclosing beam 212. Thus, the first enclosing beam 211 and the second enclosing beam 212 can be spliced ​​together by plugging the convex block and the concave groove into each other.

[0044] Of course, in other embodiments, the positions of the convex blocks and the concave grooves may be interchanged, which can also achieve the same technical effect, and there is no limitation here.

[0045] In this embodiment, the outer wall of the first enclosing beam 211 is provided with a plurality of rectangular first glue storage grooves along its length, and the outer wall of the second enclosing beam 212 is provided with a wavy second glue storage groove along its length. Of course, in other embodiments, the glue storage grooves 213 may also be provided in a triangular or other polygonal shape, which is not limited here.

[0046] 8-15 , the battery module 2 further includes a bottom plate 24 located at the bottom of the battery cell group 22 . The bottom plate 24 and the enclosing frame 21 form a cavity, and the battery cell group 22 is disposed in the cavity.

[0047] Furthermore, the battery pack also includes a second foam glue 27 filled in the cavity, which bonds the battery cell group 22, the enclosure frame 21, and the bottom plate 24 into one body. Thus, by filling the cavity with the second foam glue 27, the enclosure frame 21 not only acts as a glue barrier, but also bonds with the battery cell group 22 and the bottom plate 24 to form a complete module, preventing the second foam glue 27 from overflowing.

[0048] Referring again to Figures 8-9 , the battery module 2 also includes a thermal insulation layer 28 disposed on the base plate 24. Preferably, the thermal insulation layer 28 is mica paper, which is affixed to the top and bottom of the base plate 24. Thus, by affixing mica paper to the top and bottom of the base plate 24, thermal runaway damage to the base plate 24 and the resulting impact on the battery cells 221 can be prevented.

[0049] The battery module 2 also includes a liquid cooling assembly 26 disposed within the cavity. This assembly comprises a plurality of serpentine-shaped liquid cooling plates 261. Adjacent liquid cooling plates 261 are enclosed to form a plurality of independent partitioning holes 262 that are configured to separate adjacent battery cells 221. These partitioning holes 262 completely enclose the circumferential outer walls of the battery cells 221. This arrangement prevents the battery cells 221 from interfering with each other. If thermal runaway occurs in one battery cell 221, the partitioning holes 262 prevent it from affecting other battery cells 221, thereby preventing the thermal runaway from spreading.

[0050] 11-14 , specifically, the busbar unit includes a plurality of first conductive rows 23235 spaced apart along a first direction X, the first conductive row 23235 including a plurality of first conductive members arranged along a second direction Y and connected to each other, the first conductive member including a first connecting portion 23238 and a first conductive unit 23231 and a second conductive unit 23232 respectively located at both ends of the first connecting portion 23238; a protrusion 2321 is provided at the bottom of the first conductive unit 23231, and the protrusion 2321 can be connected to the positive electrode of one of the two battery cells 221 adjacent to each other along the first direction X; a contact portion 2322 is provided at the bottom of the second conductive unit 23232, and the contact portion 2322 is configured to be connected to the negative electrode of the other battery cell 221 adjacent to each other along the first direction X.

[0051] In this embodiment, the first conductive bar 23235 includes four first conductive members arranged along the second direction Y and interconnected. The battery cell group 22 includes a plurality of battery cell rows arranged along the second direction Y. The four first conductive members respectively cooperate with the battery cells 221 at corresponding positions in the four battery cell rows. That is, one first conductive bar 23235 connects the battery cells 221 at corresponding positions in the four battery cell rows in parallel. The first conductive unit 23231 in each first conductive member is connected to the positive electrode of the preceding battery cell 221 in the same battery cell row, and the second conductive unit 23232 is connected to the negative electrode of the following battery cell 221 in the same battery cell row. In other words, each first conductive member connects two adjacent battery cells 221 in the same battery cell row in series.

[0052] Furthermore, the busbar unit also includes a second conductive bar 23236 and a third conductive bar 23237, respectively disposed at both ends of the plurality of first conductive bars 23235. The second conductive bar 23236 includes a plurality of second conductive elements arranged along a second direction Y and interconnected. The second conductive elements include a second connecting portion 23239 and a third conductive element 23233 located on the side of the second connecting portion 23239 facing the first conductive bar 23235. The third conductive bar 23237 includes a plurality of third conductive elements arranged along the second direction Y and interconnected. The third conductive element includes a third connecting portion 23240 and a fourth conductive element 23234 located on the side of the third connecting portion 23240 facing the first conductive bar 23235.

[0053] In this embodiment, the second conductive bar 23236 includes four second conductive members arranged along the second direction Y and interconnected. The four second conductive members respectively cooperate with the battery cells 221 at corresponding positions in the four battery cell rows. That is, one second conductive bar 23236 connects the battery cells 221 at corresponding positions in the four battery cell rows in parallel. Similarly, the third conductive bar 23237 includes four third conductive members arranged along the second direction Y and interconnected. The four third conductive members respectively cooperate with the battery cells 221 at corresponding positions in the four battery cell rows. That is, one third conductive bar 23237 connects the battery cells 221 at corresponding positions in the four battery cell rows in parallel.

[0054] Referring again to FIG11 , a plurality of busbar units are spaced apart along the second direction Y. The plurality of busbar units include two end busbars at both ends and a plurality of intermediate busbars located between the two end busbars. The second conductive bar 23236 at one end of one end busbar is connected to the third conductive bar 23237 of the adjacent intermediate busbar, and the third conductive bar 23237 at the other end of the end busbar is connected to the output electrode connection plate 7. The third conductive bar 23237 at one end of the other end busbar is connected to the second conductive bar 23236 of the adjacent intermediate busbar, and the second conductive bar 23236 at the other end of the end busbar is connected to the output electrode connection plate 7. In addition, the second conductive bar 23236 in the intermediate bus is connected to the third conductive bar 23237 in the adjacent intermediate bus located on the same side, and the third conductive bar 23237 in the intermediate bus is connected to the second conductive bar 23236 in another adjacent intermediate bus, thereby realizing the series connection of multiple bus units.

[0055] Referring to Figure 10, the insulating cover 231 is provided with a first hollow observation hole 2311 at the position corresponding to the several protrusions 2321 on the bus 232. The first observation hole 2311 is also circular so that it matches the shape of the protrusion 2321, thereby facilitating observation of whether the protrusion 2321 is in sufficient contact with the positive electrode of the battery cell 221; similarly, the insulating cover 231 is provided with a second hollow observation hole 2312 at the position corresponding to the several abutting portions 2322 on the bus 232. The second observation hole 2312 is arc-shaped and matches the size of the rib, thereby facilitating observation of whether the abutting portion 2322 is in sufficient contact with the negative electrode of the battery cell 221.

[0056] Referring to Figures 5-7, the box body 1 includes a box frame 11, a bottom guard plate 13, and an inner beam 12. The box frame 11 and the bottom guard plate 13 enclose a cavity structure. The inner beam 12 is located within the cavity structure and is fixed to the box frame 11 and / or the bottom guard plate 13. The inner beam 12 divides the cavity structure into a first cavity structure 11c and a second cavity structure 11d. The second cavity structure 11d is configured to accommodate electrical components 14. In addition, the box body 1 includes an upper cover plate 114, which covers the box frame 11 to seal the cavity structure.

[0057] Referring again to Figures 5-7, the front and rear ends of the inner beam 12 are respectively connected to the inner side walls of the two first side beams 111, thereby allowing the inner beam 12 to sequentially separate the box frame 11 into a first frame 11a and a second frame 11b, arranged on the left and right. Furthermore, the bottom guard plate 13 includes a first bottom guard plate 131 that covers the bottom of the first frame 11a and a second bottom guard plate 132 that covers the bottom of the second frame 11b. The first frame 11a and the first bottom guard plate 131 together form a first cavity structure 11c configured to accommodate the battery modules 2. The second frame 11b and the second bottom guard plate 132 together form a second cavity structure 11d configured to accommodate the electrical components 14.

[0058] Thus, by splitting the bottom guard plate 13 into the first bottom guard plate 131 and the second bottom guard plate 132, when an electrical component 14 fails and requires repair, only the second bottom guard plate 132 needs to be removed and the faulty electrical component 14 removed for replacement or repair, thereby eliminating the need to remove the entire battery pack. This reduces the cost of repairing and replacing the electrical component 14 and improves repair efficiency. The inner beam 12 has integrated water pipes 133 configured to communicate with the liquid cooling assembly 26 in the battery module 2, allowing the inner beam 12 to be designed to be the same height as the first side beam 111. That is, the end face of the inner beam 12 facing away from the bottom guard plate 13 is flush with the end face of the box frame 11 facing away from the bottom guard plate 13, thereby increasing the rigidity of the inner beam 12 and, in turn, the overall rigidity of the box frame 11.

[0059] In addition, a first sealing ring 151 is provided between the first bottom guard plate 131 and the first frame 11a, and a second sealing ring 152 is provided between the second bottom guard plate 132 and the second frame 11b. Thus, the first and second bottom guard plates 131, 132 are sealed to the box frame 11 via the first and second sealing rings 151, 152, respectively. The battery module 2 is bonded and sealed to the box body 1 via the first foam adhesive 3, thereby forming a double-layer sealing structure to reduce the risk of air leakage.

[0060] Referring to Figures 6-7 , the inner sidewall of the first side beam 111 is further provided with a positioning ridge 1112 extending along its length. A sidewall of the inner beam 12 is connected to the end of the positioning ridge 1112, and the other end of the positioning ridge 1112 is connected to the sidewall of the second side beam 112. Thus, the provision of the positioning ridge 1112 facilitates positioning of the inner beam 12, thereby improving assembly efficiency. Furthermore, the provision of the positioning ridge 1112 further enhances the support strength of the first side beam 111.

[0061] Referring to Figures 4-6, the box body 1 also includes an output pole base 19 mounted on the inner beam 12, and the output pole base 19 is configured to be connected to the output pole connecting piece 7 on the battery module 2. Specifically, the output pole base 19 includes a plastic base, a copper bracket arranged on the top of the plastic base, and two nuts arranged in the copper bracket and spaced apart. The output pole connecting piece 7 is connected to a nut on the output pole base 19 by a bolt, thereby fixing the output pole connecting piece 7 to the copper bracket to achieve electrical connection. In addition, it also includes an adapter bracket 8 arranged on the side wall of the inner beam 12 and located in the second cavity structure, and a first adapter plate 81 is connected to the adapter bracket 8. The first adapter plate 81 is connected to another nut on the output pole base 19 by a bolt, thereby fixing the first adapter plate 81 to the copper bracket to achieve electrical connection. Preferably, the first adapter plate 81 is a high-voltage copper busbar.

[0062] Furthermore, the electrical component 14 is a BUD system, which is connected to a second adapter plate 82, which is connected to the first adapter plate 81 to achieve electrical connection. Preferably, the second adapter plate 82 is a high-voltage copper busbar. Thus, the output terminal connecting plate 7 on the battery module 2 is electrically connected to the BUD system through the copper bracket on the output terminal base 19, the first adapter plate 81, and the second adapter plate 82.

[0063] Example 2

[0064] Referring to Figures 1-16, the present application provides a battery box, including a box frame 11, which includes two first side beams 111 arranged in parallel and spaced apart in the front-to-back direction and in the shape of long strips, and two second side beams 112 arranged in parallel and spaced apart in the left-to-right direction and in the shape of long strips. The two first side beams 111 and the two second side beams 112 are spliced ​​and welded together by a mortise and tenon interlocking structure 113, thereby splicing into a rectangular box frame 11. The mortise and tenon interlocking structure 113 includes a convex block 1131 and a concave groove 1132 that are interlocked. The convex block 1131 is provided at the end of the first side beam 111, and the concave groove 1132 is provided at the end of the second side beam 112. Thus, the mutual splicing of the first side beam 111 and the second side beam 112 can be achieved by the mutual interlocking of the convex block 1131 and the concave groove 1132.

[0065] Therefore, the first side beam 111 and the second side beam 112 in the box frame 11 are spliced ​​and welded to each other through the mortise and tenon structure 113, thereby improving the rigidity of the connection between the first side beam 111 and the second side beam 112, and further improving the overall rigidity of the box frame 11.

[0066] Of course, in other embodiments, the first side beam 111 and the second side beam 112 may also be configured to be L-shaped or C-shaped, which is not limited here.

[0067] The battery case 1 also includes a plurality of reinforcing beams 17 disposed within the second frame 11b and spaced apart, and a plurality of reinforcing plates 18 disposed within the first frame 11a and spaced apart. The plurality of reinforcing beams 17 are disposed parallel to the first side beam 111, and the plurality of reinforcing plates 18 are disposed 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 is connected to the other side wall of the inner beam 12; one end of the reinforcing plate 18 is connected to the positioning ridge 16 within one first side beam 111, and the other end is connected to the positioning ridge 16 within the other first side beam 111.

[0068] Thus, by providing a plurality of reinforcing plates 18 in the first frame 11 a and a plurality of reinforcing beams 17 in the second frame 11 b , the strength of the battery box 1 is improved.

[0069] The present application also provides a battery pack, including the above-mentioned battery case 1, battery module 2 and electrical component 14, the battery module 2 is installed in the first cavity structure 11c of the battery case 1 through the first foam glue 3, and the electrical component 14 is installed in the second cavity structure 11d of the battery case 1.

[0070] Example 3

[0071] 1-17 , the present application provides a battery module 2 comprising a cell group 22, a CCS assembly 23 disposed on top of the cell group 22, and a base plate 24 disposed at the bottom of the cell group 22. The cell group 22 comprises a plurality of cells 221; the CCS assembly 23 comprises a busbar 232 and an insulating cover plate 231 covering the busbar 232. The busbar 232 connects the plurality of cells 221 in series and in parallel; the base plate 24 is fixedly connected to the insulating cover plate 231.

[0072] Among them, the busbar 232 is provided with several positive conductive units and several negative conductive units, the bottom of the positive conductive unit is provided with a protrusion 2321, and the bottom of the negative conductive unit is provided with an abutment 2322. When the insulating cover 231 is connected and fixed to the bottom plate 24, the insulating cover 231 drives the several protrusions 2321 on the busbar 232 to respectively abut against and deform the positive poles of several battery cells 221 by interference, and drives the several abutment parts 2322 on the busbar 232 to respectively abut against and deform the negative poles of several battery cells 221 by interference, thereby realizing the connection between the busbar 232 and the battery cell group 22.

[0073] Thus, the connection between the CCS assembly 23 and the cell pack 22 is achieved by adopting a welding-free connection method. This not only avoids the inherent defects of the welding process and improves the reliability of product performance, but also eliminates the need for welding equipment and welding professionals, thereby saving electricity and labor costs. In addition, the welding-free connection method is easy to maintain and can be easily disassembled for repair.

[0074] The insulating cover plate 231 is made of plastic or other materials. Of course, in other embodiments, composite materials with higher mechanical strength, electrical pressure resistance, or temperature and flame retardancy may also be used. The insulating cover plate 231 can serve only as an insulating pressure plate for the battery module 2, or it can be part of the outer packaging shell of the entire battery pack.

[0075] In this embodiment, the battery cell 221 is a circular battery cell 221 , the positive electrode of which is the protrusion 2321 on the top of the battery cell 221 , and the negative electrode of which is the shell of the battery cell 221 excluding the top protrusion 2321 and the bottom.

[0076] Specifically, the busbar 232 includes a plurality of busbar units arranged along the Y direction, the busbar unit includes a plurality of first conductive bars 23235 spaced apart along the X direction, the first conductive bars 23235 include a plurality of first conductive members arranged along the Y direction and connected to each other, the first conductive members include a first connecting portion 23238 and a first positive conductive unit and a first negative conductive unit respectively located at both ends of the first connecting portion 23238; a protrusion 2321 is provided at the bottom of the first positive conductive unit, and the protrusion 2321 can be connected to the positive electrode of one of the two battery cells 221 adjacent to each other along the X direction; a contact portion 2322 is provided at the bottom of the first negative conductive unit, and the contact portion 2322 is configured to be connected to the negative electrode of the other battery cell 221 adjacent to each other along the X direction.

[0077] Furthermore, the busbar unit also includes a second conductive bar 23236 and a third conductive bar 23237, respectively disposed at both ends of the plurality of first conductive bars 23235. The second conductive bar 23236 includes a plurality of second conductive elements arranged and interconnected along the Y direction. The second conductive elements include a second connecting portion 23239 and a second positive conductive element located on the side of the second connecting portion 23239 facing the first conductive bar 23235. The third conductive bar 23237 includes a plurality of third conductive elements arranged and interconnected along the Y direction. The third conductive element includes a third connecting portion 23240 and a second negative conductive element located on the side of the third connecting portion 23240 facing the first conductive bar 23235.

[0078] The insulating cover plate 231 covers the top of the four enclosing beams and seals the cavity. The insulating cover plate 231 and the base plate 24 are connected and fixed by a first snap-fit ​​structure, and the insulating cover plate 231 and the enclosing beams are connected and fixed by a second snap-fit ​​structure. Specifically, the first snap-fit ​​structure includes a first snap-fit ​​and a first snap-fit ​​hole that are mutually engaged. The first snap-fit ​​hole is provided on the insulating cover plate 231, and the first snap-fit ​​is provided on the base plate 24. The first snap-fit ​​passes through the gaps between the battery cells 221. Thus, the connection between the insulating cover plate 231 and the base plate 24 can be achieved by snapping the first snap-fit ​​onto the first snap-fit ​​hole. The second snap-fit ​​structure includes a second snap-fit ​​and a second snap-fit ​​hole that are mutually engaged. The second snap-fit ​​hole is provided at the edge of the insulating cover plate 231, and the second snap-fit ​​is provided on the enclosing beam. Thus, the connection between the insulating cover plate 231 and the enclosing beam can be achieved by snapping the second snap-fit ​​onto the second snap-fit ​​hole.

[0079] In this embodiment, the first buckle and the second buckle, and the first buckle hole and the second buckle hole have the same structure; the length of the first buckle is longer than that of the second buckle.

[0080] Of course, in other embodiments, the setting positions of the first clip and the first clip hole can also be interchanged, that is, the first clip hole is set on the base plate 24, and the first clip is set on the insulating cover plate 231, which can also achieve the same technical effect; similarly, the setting positions of the second clip and the second clip hole can also be interchanged, that is, the second clip hole is set on the enclosing beam, and the second clip is set on the insulating cover plate 231, which can also achieve the same technical effect, and there is no restriction here.

[0081] Therefore, the base plate 24 is provided with enclosing beams on all sides and is bonded and fixed by the first foam glue 3. The enclosing beams not only serve as glue barriers, but also form a complete module with the insulating cover plate 231 on the CCS component 23 and the base plate 24 to prevent the first foam glue 3 from overflowing.

[0082] The battery module 2 further includes a thermal insulation layer 28 disposed on the bottom plate 24. Preferably, the thermal insulation layer 28 is mica paper, which is affixed to the top and bottom of the bottom plate 24. Therefore, by affixing mica paper to the top and bottom of the bottom plate 24, thermal runaway can be prevented from burning the bottom plate 24 and affecting the battery cells 221.

[0083] The present application also provides a battery pack, comprising a box 1 and the battery module 2 and BUD system provided above disposed in the box 1. Specifically, the battery module 2 is disposed in a first frame 11a, and the BUD system is disposed in a second frame 11b.

[0084] Example 4

[0085] Referring to Figures 1-17, the present application provides a CCS assembly 23, comprising a busbar 232 and an insulating cover 231 covering the busbar 232. The busbar 232 comprises a plurality of busbar units spaced apart along a second direction Y. The busbar units are provided with a first conductive unit 23231 and a second conductive unit 23232. The first conductive unit 23231 is provided with a protrusion 2321 configured to abut the first electrode of the battery cell 221, and the second conductive unit 23232 is provided with an abutment portion 2322 configured to abut the second electrode of the battery cell 221. Preferably, the abutment portion 2322 is a circular rib.

[0086] In this embodiment, the battery cell 221 is a cylindrical battery cell, the first electrode is the positive electrode of the battery cell, that is, the protrusion 2321 on the top of the battery cell 221; the second electrode is the negative electrode of the battery cell, that is, the rest of the shell of the battery cell 221 except the top protrusion and the bottom.

[0087] Among them, the insulating cover 231 is configured to be connected and fixed to the plastic bracket 4 of the battery pack. When the insulating cover 231 is connected and fixed to the plastic bracket 4, the insulating cover 231 drives the several protrusions 2321 on the bus 232 to respectively interfere with and abut against the top protrusions of several battery cells 221 and deform, and drives the several ribs on the bus 232 to respectively interfere with and abut against the other shells of several battery cells 221 except the top protrusions and deform, thereby realizing the connection between the bus 232 and the electrodes of the battery cells 221.

[0088] Of course, in other embodiments, the rib may also be sleeved on the outer edge of the top of the battery cell 221 and abutted with interference fit, and the rib may also be in an arc shape or other shapes, which are not limited here.

[0089] It can be seen from this that the connection structure between the CCS assembly 23 and the battery cell module 2 of the present application is simple, easy to maintain, and convenient to disassemble and repair.

[0090] The insulating cover plate 231 is made of plastic or other materials. Of course, in other embodiments, composite materials with higher mechanical strength, electrical pressure resistance, or temperature and flame retardancy may also be used. The insulating cover plate 231 may serve only as an insulating pressure plate for the battery pack, or may be part of the outer packaging shell of the entire battery pack.

[0091] The present application also provides a battery pack, including the above-mentioned CCS assembly 23, battery cell module 2 and plastic bracket 4, the plastic bracket 4 includes a plastic base plate 41 and four plastic beams 42 respectively arranged around the plastic base plate 41, and the insulating cover plate 231 is fixed to the plastic base plate 41 and the four plastic beams 42 respectively through a clamping structure 25.

[0092] The cell module 2 includes a plurality of cell assemblies corresponding to the plurality of busbar units. The cell assembly includes a plurality of cell rows spaced apart along the second direction Y. The cell rows include a plurality of cell 221 spaced apart along the first direction X.

[0093] Example 5

[0094] Referring to Figures 1-24, the present application provides an output pole base 19, which is configured to provide insulation protection for the output pole connecting piece 7 in the battery module. Specifically, the output pole base 19 includes an insulating base 5 and a conductive bracket 6 fixed to the insulating base 5. The conductive bracket 6 is provided with a connector 61, and a portion of the connector 61 is located within the insulating base 5. In addition, the connector 61 and at least one of the conductive brackets 6 form a stepped structure. This stepped structure can be configured to limit the axial movement of the connector 61 to prevent the connector 61 from being pulled off, thereby affecting the locking reliability.

[0095] Specifically, the connecting member 61 is a rivet nut, and an annular protrusion 611 is provided on the top of the rivet nut. The diameter of the annular protrusion 611 is smaller than the nut of the rivet nut, thereby forming a step structure. The step structure is embedded in the conductive bracket 6 to limit the axial movement of the connecting member 61.

[0096] Therefore, when the connecting piece 61 is subjected to force, the step structure makes it difficult for the connecting piece 61 to loosen axially, thereby improving the torsion resistance and pull-out resistance of the connecting piece 61 on the conductive bracket 6, and further improving the connection reliability between the connecting piece 61 and the conductive bracket 6.

[0097] Of course, in other embodiments, a step groove may be opened in the conductive bracket 6 to form a step structure, and the connecting member 61 may be clamped in the step structure to limit the movement of the connecting member 61 in the axial direction, which can also achieve the same technical effect and is not limited here.

[0098] Among them, the insulating base 5 is made of plastic or plastic material; the conductive bracket 6 is a copper bracket, the rivet nut is fixed in the conductive bracket 6 by a riveting process, and the upper part of the rivet nut is embedded in the conductive bracket 6; the lower part of the rivet nut passes through the conductive bracket 6 and extends into the insulating base 5, and is integrally injection molded with the insulating base 5 to improve the supporting strength of the rivet nut.

[0099] Thus, the connector 61 can fix the output pole connecting piece 7 on the insulating base 5, thereby connecting and fastening the output pole connecting piece 7. At the same time, the insulating base 5 is an injection-molded plastic structure or a plastic structure, thereby being able to provide insulation protection for the output pole connecting piece 7.

[0100] Furthermore, the conductive bracket 6 and the insulating base 5 are integrally injection-molded, thereby achieving a fixed connection between the conductive bracket 6 and the insulating base 5. Specifically, the two sides of the conductive bracket 6 are bent inward to form a circular ring structure. The interior of the circular ring structure forms a cavity 62, and the upper portion of the connector 61 is located within the cavity 62. The entire area of ​​the cavity 62, except for the connector 61, is filled with plastic. In addition, the top center of the conductive bracket 6 is recessed to form a groove 64, which is also filled with plastic.

[0101] Therefore, the cavity 62 and the groove 64 in the conductive bracket 6 are filled with plastic material, thereby increasing the contact area between the conductive bracket 6 and the insulating base 5 and further improving the connection reliability between the two.

[0102] Furthermore, a third clip 191 is provided at the bottom of the insulating base 5. The third clip 191 is two elastic protrusions arranged at intervals. When the two elastic protrusions are subjected to force, they can be displaced to facilitate being clamped in the third clamping hole 1211, thereby fixing the insulating base 5 on the battery module frame or box 1.

[0103] In addition, the two sides of the insulating base 5 are integrally provided with limit plates 51 extending upward, and the output pole connecting piece 7 is clamped between the two limit plates 51 to achieve limitation, thereby preventing the output pole connecting piece 7 from being offset when locked on the output pole base 19 and causing a short circuit.

[0104] The present application also provides a battery pack, including a box body 1, a battery module (not shown in the figure) arranged in the box body 1, and the output pole base 19 mentioned above.

[0105] The inner beam 12 is provided with a mounting groove 121, and the output pole base 19 is installed in the mounting groove 121. Specifically, the mounting groove 121 is provided with a third latch hole 1211, and the output pole base 19 can be mounted on the inner beam 12 by latching the third latch 191 on the output pole base 19 with the third latch hole 1211 in the mounting groove 121.

[0106] Of course, in other embodiments, the positions of the third buckle 191 and the third hole 1211 may be swapped, that is, the third buckle 191 may be set in the installation groove 121 and the third hole 1211 may be set on the insulating base 5 , which is not limited here.

[0107] Furthermore, the output pole connecting piece 7 provided on the battery module is provided with a through hole, and the output pole connecting piece 7 can be fixed to the output pole base 19 by using a fastener to pass through the through hole and connect with the connector 61. In this embodiment, the fastener is a bolt threadedly connected to a rivet nut.

[0108] Specifically, two connecting pieces 61 arranged in parallel are provided on the insulating base 5. The output pole connecting piece 7 is connected to one connecting piece 61 by bolts. One end of the first adapter piece 81 is connected to the other connecting piece 61 on the insulating base 5 by bolts, and the other end is connected to the second adapter piece 82. The other end of the second adapter piece 82 is connected to the BUD system.

[0109] In this embodiment, the first transfer plate 81 and the second transfer plate 82 are both high-voltage copper busbars.

Claims

1. A battery pack, comprising: A box body (1), wherein a first cavity structure (11c) is formed inside the box body; At least one battery module (2) is arranged in the first cavity structure (11c); the battery module (2) comprises at least a battery cell group (22) and an enclosure frame (21) enclosing the battery cell group (22); the enclosure frame (21) is detachably connected to the box body (1).

2. The battery pack according to claim 1, further comprising a fixing member, wherein the fixing member connects the enclosing frame (21) and the box body (1); And / or, the enclosing frame (21) is snap-connected to the box body (1).

3. The battery pack according to claim 2, wherein: The fixing member comprises a first foam glue (3) that can be dissolved by a dissolving agent, a glue storage groove (213) is provided on a side of the enclosing frame (21) facing away from the battery cell group (22), a portion of the first foam glue (3) is filled in the glue storage groove (213), and another portion of the first foam glue (3) is glued to the box body (1).

4. The battery pack according to any one of claims 1 to 3, wherein: The battery module (2) further comprises a bottom plate (24) located at the bottom of the battery cell group (22), the bottom plate (24) and the enclosing frame (21) enclosing to form a cavity, and the battery cell group (22) is arranged in the cavity.

5. The battery pack according to claim 4, wherein: The battery module (2) further comprises a CCS assembly (23) located on the top of the battery cell group (22), wherein: The CCS assembly (23) comprises a busbar (232) and an insulating cover plate (231) covering a side of the busbar (232) facing away from the battery cell group (22), wherein the busbar (232) is connected in series and in parallel with a plurality of battery cells (221) in the battery cell group (22); The insulating cover plate (231) is connected to the bottom plate (24) via a clamping structure (25), and / or the insulating cover plate (231) is connected to the enclosing frame via a clamping structure (25).

6. The battery pack according to claim 5, wherein: The snap-fit ​​structure (25) comprises a snap buckle (251) and a snap hole (252) that are snap-fitted to each other, one of the snap buckle (251) and the snap hole (252) being arranged on the insulating cover plate (231), and the other of the snap buckle (251) and the snap hole (252) being arranged on the bottom plate (24) and the enclosing frame (21).

7. The battery pack according to claim 6, further comprising a second foam glue (27) filled in the cavity, wherein the second foam glue (27) bonds the battery cell group (22), the enclosing frame (21) and the bottom plate (24) into one body.

8. The battery pack according to any one of claims 1 to 3, wherein: The battery module (2) further comprises a liquid cooling assembly (26) arranged in the cavity, the liquid cooling assembly (26) comprising a plurality of snake-shaped liquid cooling plates (261), adjacent liquid cooling plates (261) enclosing a plurality of mutually independent separation holes (262) configured to separate adjacent battery cells (221) in the battery cell group (22), the battery cells (221) being wrapped in the separation holes (262).

9. The battery pack according to claim 4, further comprising a heat insulating layer (28) arranged on the bottom plate (24), the heat insulating layer (28) being arranged on a side of the bottom plate (24) close to the battery cell group (22) and / or a side away from the battery cell group (22).

10. The battery pack according to claim 5, wherein: The bus bar comprises a plurality of bus bar units (2323); the bus bar unit (2323) is provided with a first conductive unit (23231) and a second conductive unit (23232); the first conductive unit (23231) is provided with a protrusion (2321), and the second conductive unit (23232) is provided with an abutment portion (2322); When the insulating cover plate (231) is connected and fixed to the bottom plate (24), the insulating cover plate (231) drives the plurality of protrusions (2321) on the bus bar (232) to respectively abut against first electrodes of a plurality of battery cells (221) in the battery cell group (22), and drives the plurality of abutting portions (2322) on the bus bar (232) to respectively abut against second electrodes of a plurality of battery cells (221) in the battery cell group (22).

11. The battery pack according to claim 5, wherein: The invention comprises the CCS assembly (23), the battery cell group (22) and a plastic bracket (4), wherein the insulating cover plate (231) is connected and fixed to the enclosing frame (21), and the insulating cover plate (231) drives a plurality of protrusions (2321) on the bus bar (232) to respectively abut against first electrodes of a plurality of battery cells (221), and drives a plurality of abutting portions (2322) on the bus bar (232) to respectively abut against second electrodes of a plurality of battery cells (221).

12. The battery pack according to claim 10, wherein: Positions on the insulating cover plate (231) corresponding to the plurality of protrusions (2321) are each provided with a hollow first observation hole (2311), and / or positions on the insulating cover plate (231) corresponding to the plurality of abutment portions (2322) are each provided with a hollow second observation hole (2312).

13. The battery pack according to any one of claims 1 to 3, wherein: The box body (1) comprises a box body frame (11), a bottom guard plate (13) and an inner beam (12); the box body frame (11) and the bottom guard plate (13) are arranged to form a cavity structure; the inner beam (12) is located in the cavity structure and is fixed to the box body frame (11) and / or the bottom guard plate (13); The inner beam (12) divides the cavity structure into the first cavity structure (11c) and the second cavity structure (11d), and the second cavity structure (11d) is configured to place an electrical component (14).

14. The battery pack according to any one of claims 1 to 3, wherein: The box body (1) comprises a box body frame (11), a bottom guard plate (13) and an inner beam (12); the box body frame (11) and the bottom guard plate (13) are arranged to form a cavity structure; the inner beam (12) is located in the cavity structure and is fixed to the box body frame (11) and / or the bottom guard plate (13); A water pipe (133) is integrated inside the inner beam (12); both ends of the inner beam (12) are connected to the box frame (11), and the end surface of the inner beam (12) facing away from the bottom guard plate (13) is flush with the end surface of the box frame (11) facing away from the bottom guard plate (13).

15. The battery pack according to claim 14, wherein: The inner beam (12) separates the box frame (11) into a first frame (11a) and a second frame (11b) which are independently arranged; the bottom guard plate (13) comprises a first bottom guard plate (131) covering the bottom of the first frame (11a) and a second bottom guard plate (132) covering the bottom of the second frame (11b); the first frame (11a) and the first bottom guard plate (131) are combined to form the first cavity structure (11c); and the second frame (11b) and the second bottom guard plate (132) are combined to form the second cavity structure (11d).

16. The battery pack according to claim 15, wherein: A first sealing ring (151) is provided between the first bottom guard plate (131) and the first frame (11a), and a second sealing ring (152) is provided between the second bottom guard plate (132) and the second frame (11b).

17. The battery pack according to any one of claims 14 to 16, wherein: The inner side wall of the box frame (11) is provided with a positioning convex strip (16), and the side wall of the inner beam (12) is connected to the end of the positioning convex strip (16).

18. The battery pack according to claim 17, further comprising a plurality of reinforcing beams (17) arranged in the box frame (11), one end of the reinforcing beam (17) being connected to the box frame (11), and the other end of the reinforcing beam (17) being connected to a side of the inner beam (12) away from the positioning ridge (16).

19. The battery pack according to claim 17, wherein: It also includes a plurality of reinforcing plates (18) disposed in the accommodating cavity and arranged at intervals, wherein both ends of the reinforcing plates (18) are connected to the positioning convex strips (16) on different sides of the box frame (11).

20. The battery pack according to any one of claims 1 to 19, further comprising: An insulating base (5) mounted on the box (1); A conductive bracket (6) fixed on the insulating base (5), the conductive bracket (6) being electrically connected to the battery module (2); Wherein, a connecting piece (61) is provided in the conductive bracket (6); the connecting piece (61) and at least one of the conductive brackets (6) form a step structure to limit the axial movement of the connecting piece (61).

21. The battery pack according to claim 20, wherein: At least a portion of the connecting piece (61) is located inside the insulating base (5), the connecting piece (61) is riveted to the conductive bracket (6), and the connecting piece (61) comprises a rivet nut, and a ring-shaped convex edge (611) is provided on the top of the rivet nut to form the step structure.

22. The battery pack according to claim 20, wherein: A cavity (62) is provided inside the conductive support (6), and at least a portion of the connecting piece (61) is located inside the cavity (62); the cavity (62) is filled with a portion of the insulating base (5).

23. The battery pack according to claim 20, wherein: The conductive support (6) is an annular structure, and a portion of the conductive support (6) is concave to form a groove (64), and a portion of the insulating base (5) is filled in the groove (64).

24. The battery pack according to claim 20, further comprising an output pole connecting piece (7), wherein the output pole connecting piece (7) is connected to the connecting piece (61) via a fastener to be fixed on the output pole base (19), and limiting plates (51) configured to limit the output pole connecting piece (7) are protruding from both sides of the insulating base (5), and the output pole connecting piece (7) is electrically connected to the battery module (2) and the conductive bracket (6).

25. An automobile comprising the battery pack according to any one of claims 1 to 24.

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