Battery pack and electric vehicle

Abstract

The utility model provides a battery pack and an electric vehicle integrated with the battery pack. The battery pack comprises a box body, one or more battery core stacking bodies and an electrode fixing assembly, the battery cell stack body is formed by stacking a plurality of soft package battery cells along the thickness direction of the soft package battery cells. The electrode fixing assembly comprises a busbar and a busbar support for supporting the busbar. The busbar bracket is matched and connected with a fixing structure on the box body; and the busbar is matched and connected with an electrode of the battery cell stacking body.

Description

[0001] This application claims priority to Chinese patent application number 202311785491.0, the contents of which are cited herein. Technical Field

[0002] The utility model relates to the technical field of power batteries, in particular to a battery pack and an electric vehicle integrated with the battery pack. Background Art

[0003] The operating voltage of a single secondary battery is about 2.5V to 4.5V. In electric vehicles or energy storage systems that require large capacity and high voltage output, it is usually necessary to connect multiple battery cells in series and / or in parallel to form a battery module, and then connect the battery modules in series and / or in parallel to form a battery pack, and further use the battery pack as an energy system for powering electric vehicles or as an energy storage system. The number and shape of the battery modules used to build the battery pack and the number and shape of the battery cells used to form the battery module can be flexibly changed according to actual needs.

[0004] In the field of power batteries used in electric vehicles, in order to improve the full-charge endurance and charging speed of electric vehicles, it is necessary to further enhance the energy density and cooling performance of the battery pack. As a solution to improve energy density, the CTP (cell to pack) type battery pack omits the step of connecting the battery cells in series and / or in parallel to form a battery module, and directly integrates the battery cells into a battery pack, thereby eliminating the structural parts and electrical connectors required to form a battery module, so that the space left for the battery cells themselves can be increased.

[0005] At present, common battery cells are divided into cylindrical cells, square-shell cells and soft-pack cells according to their structures. CTP battery packs using square-shell cells have been widely promoted and used, but soft-pack cells still face a series of problems in the process of integration into CTP battery packs because they are not easy to withstand external impacts and have poor assembly properties. Utility Model Content

[0006] The utility model solves at least one of the multiple problems faced by the prior art in which soft-pack battery cells are integrated into a soft-pack CTP battery pack.

[0007] The utility model provides a battery pack, including a box body, a battery cell stack, a thermally conductive structural adhesive and an electrode fixing assembly. The box body includes a bottom plate. The battery cell stack is located in the box body, and is formed by stacking a plurality of soft-pack battery cells. The battery cell stack is provided with an electrode lead-out portion at the end in the length direction of the soft-pack battery cells. The thermally conductive structural adhesive is directly bonded between the battery cell stack and the bottom plate. The electrode fixing assembly is located at the end of the battery cell stack where the electrode lead-out portion is formed, and includes a bus and a bus bracket supporting the bus, the bus bracket is cooperatively connected to the box body, and the electrode lead-out portion is fixed to the bus.

[0008] In the battery pack of the optional technical solution, the box includes a beam fixed to the bottom plate, the bus bracket includes a nut member embedded therein, the bus bracket is directly fixed to the beam or fixed to the beam through a connecting structure, and the bus is connected to the bus bracket in a form corresponding to the nut member. The form in which the bus corresponds to the nut member means a form in which the bus can be connected to the bus bracket using the nut member, and more specifically, a form in which the through hole on the bus for connection is opposite to the threaded hole of the nut member.

[0009] In the battery pack of the optional technical solution, the bus includes a plate-like main body and an output connection part, the output connection part is formed by bending and extending the end of the plate-like main body, and the bus bracket includes a first bus support part and a second bus support part, the second bus support part includes a nut member embedded therein, and is directly fixed to the beam or fixed to the beam through a connecting structure. The plate-like main body is fixedly connected to the first bus support part in a surface-to-surface manner. The output connection part is fixedly connected to the second bus support part in a form of overlapping the nut member. Among them, the plate-like main body and the first bus support part are in surface-to-surface contact, which means that one side plate surface of the plate-like main body and the support surface of the first bus support part are in contact with each other.

[0010] In the battery pack of an optional technical solution, a waist hole is opened on the output connection part, and the waist hole has a length extending along the stacking direction of the soft-pack battery cells. The output connection part is fixedly connected to the second bus support part by a bolt that passes through the waist hole and the nut member in sequence.

[0011] In the battery pack of the optional technical solution, the first busbar support portion has a baffle, the baffle is located between the battery cell stack and the busbar, and the plate-shaped body is attached to the surface of the baffle parallel to the stacking direction of the soft-pack battery cells.

[0012] In the battery pack of an optional technical solution, the second busbar support portion has a buckle that cooperates with the beam or the connecting structure.

[0013] In the battery pack of an optional technical solution, the top of the nut member is higher than the upper surface of the second bus support portion near the output connection portion in the vertical direction, and the vertical distance difference D between the top of the nut member and the upper surface of the second bus support portion satisfies 0.3mm≤D≤0.5mm.

[0014] In the battery pack of the optional technical solution, the thickness H of the wall of the second busbar support portion at a position corresponding to the nut satisfies 1.2 mm≤H≤1.8 mm.

[0015] In the battery pack of the optional technical solution, foam glue is filled between the battery cell stack and the beam, and the foam glue can wrap at least part of the electrode lead-out part and at least part of the bus bar.

[0016] In the battery pack of the optional technical solution, there are two busbars, the first busbar support portion is provided with a first partition portion of a plate-shaped body separating the two busbars, and the second busbar support portion is provided with a second partition portion of an output connection portion separating the two busbars.

[0017] In the battery pack of the optional technical solution, the first busbar supporting portion is provided with two through holes for the electrode lead-out portions to pass through, and the two through holes are disposed on both sides of the first partition portion.

[0018] In the battery pack of the optional technical solution, the busbar bracket is provided with a positioning block for clamping by a tool.

[0019] In the battery pack of the optional technical solution, a positioning hole for inserting a tool is provided on the top of the busbar bracket.

[0020] In the battery pack of the optional technical solution, one of the first busbar support portion and the second busbar support portion is provided with a guide bar, and the other is provided with a slot that matches and plugs with the guide bar.

[0021] In a battery pack of an optional technical solution, the first busbar support portion is provided with a through hole for the electrode lead-out portion to pass through.

[0022] In the battery pack of an optional technical solution, the first busbar support portion and the second busbar support portion are integrally formed.

[0023] In the battery pack of an optional technical solution, two electrode lead-out parts are provided at one end of the cell stack in the length direction of the soft-pack battery cell. The positive and negative polarities of the two electrode lead-out parts are opposite and the two electrode lead-out parts are adjacent to each other in the stacking direction of the soft-pack battery cells. The two electrode lead-out parts respectively pass through two through holes and are respectively fixed to two bus bars.

[0024] In the battery pack of the optional technical solution, two electrode lead-out parts are provided at one end of the cell stack in the length direction of the soft-pack cell, and the positive and negative polarities of the two electrode lead-out parts are opposite and are disposed at the two ends of the cell stack in the stacking direction of the soft-pack cell. There are two electrode fixing assemblies, one electrode lead-out part is fixed to the busbar of one electrode fixing assembly, and the other electrode lead-out part is fixed to the busbar of the other electrode fixing assembly.

[0025] In the battery pack of the optional technical solution, the beam includes a side beam and a middle beam, the side beam is arranged along the edge of the bottom plate and encloses to form an installation space, and the middle beam extends along the stacking direction of the soft-pack battery cell and divides the installation space into a first installation space and a second installation space. The battery cell stack includes a first battery cell stack installed in the first installation space and a second battery cell stack installed in the second installation space, and the first battery cell stack is provided with a first electrode lead-out portion at the end close to the second battery cell stack, and the second battery cell stack is provided with a second electrode lead-out portion at the end close to the first battery cell stack. The positive and negative polarities of the first electrode lead-out portion and the second electrode lead-out portion are opposite, and are arranged corresponding to each other across the middle beam. The busbar bracket is directly fixed to the middle beam or fixed to the middle beam through a connecting structure. The busbar includes a first busbar at least partially located in the first installation space and a second busbar at least partially located in the second installation space, and the busbar bracket supports the first busbar and the second busbar electrically connected to each other. The first electrode lead-out portion is fixed to the first busbar, and the second electrode lead-out portion is fixed to the second busbar.

[0026] In the battery pack of the optional technical solution, the first busbar includes a plate-shaped body and an output connection portion formed by bending and extending the end of the plate-shaped body, and the second busbar includes a plate-shaped body and an output connection portion formed by bending and extending the end of the plate-shaped body. The busbar bracket supports the output connection portion of the first busbar and the output connection portion of the second busbar separated from each other. The busbar also includes a transition busbar, which is connected between the output connection portion of the first busbar and the output connection portion of the second busbar. A bolt passes through the transition busbar and the output connection portion of the first busbar, and is connected in cooperation with a nut member embedded in the busbar bracket. Another bolt passes through the output connection portion of the transition busbar and the second busbar, and is connected in cooperation with another nut member embedded in the busbar bracket. The first electrode lead-out portion is fixed to the plate-shaped body of the first busbar, and the second electrode lead-out portion is fixed to the plate-shaped body of the second busbar.

[0027] In the battery pack of the optional technical solution, the first busbar includes a plate-like main body and an output connection portion formed by bending and extending the end of the plate-like main body, and the second busbar includes a plate-like main body and an output connection portion formed by bending and extending the end of the plate-like main body. The busbar bracket supports the output connection portion of the first busbar and the output connection portion of the second busbar stacked on each other in the vertical direction. The bolt passes through the output connection portion of the first busbar and the output connection portion of the second busbar, and is connected in cooperation with the nut member embedded in the busbar bracket. The first electrode lead-out portion is fixed to the plate-like main body of the first busbar, and the second electrode lead-out portion is fixed to the plate-like main body of the second busbar.

[0028] In the battery pack of the optional technical solution, the beam includes a side beam and a middle beam, the side beam is arranged along the edge of the bottom plate and encloses to form an installation space, and the middle beam extends along the stacking direction of the soft-pack battery cell and divides the installation space into a first installation space and a second installation space. The battery cell stack includes a first battery cell stack installed in the first installation space and a second battery cell stack installed in the second installation space. The first positive lead-out portion and the first negative lead-out portion are provided at the end of the first battery cell stack close to the second battery cell stack, and the first positive lead-out portion and the first negative lead-out portion are placed at the two ends of the battery cell stack in the stacking direction of the soft-pack battery cells. The second battery cell stack is provided with a second positive lead-out portion and a second negative lead-out portion at the end close to the first battery cell stack, and the second positive lead-out portion and the second negative lead-out portion are placed at the two ends of the battery cell stack in the stacking direction of the soft-pack battery cells, and the positions of the first positive lead-out portion and the second negative lead-out portion correspond, and the positions of the first negative lead-out portion and the second positive lead-out portion correspond. A third positive electrode lead-out portion and a third negative electrode lead-out portion are provided at an end of the first battery cell stack away from the second battery cell stack. The third positive electrode lead-out portion and the third negative electrode lead-out portion are adjacent to each other in the stacking direction of the soft-pack battery cells.

[0029] The electrode fixing assembly includes a first electrode fixing assembly, a second electrode fixing assembly and a third electrode fixing assembly. The busbar bracket of the first electrode fixing assembly is directly fixed to the middle beam or fixed to the middle beam through a connecting structure, and the first positive lead-out portion and the second negative lead-out portion are respectively fixed to two mutually electrically connected busbars of the first electrode fixing assembly. The busbar bracket of the second electrode fixing assembly is directly fixed to the middle beam or fixed to the middle beam through a connecting structure, and the first negative lead-out portion and the second positive lead-out portion are respectively fixed to two mutually electrically connected busbars of the second electrode fixing assembly. The busbar bracket of the third electrode fixing assembly is directly fixed to the side beam or fixed to the side beam through a connecting structure, and the third positive lead-out portion and the third negative lead-out portion are respectively fixed to two mutually separated busbars of the third electrode fixing assembly.

[0030] In the battery pack of the optional technical solution, the beam includes a side beam and a middle beam, the side beam is arranged along the edge of the bottom plate and encloses to form an installation space, and the middle beam extends along the stacking direction of the soft-pack battery cells and divides the installation space into a first installation space and a second installation space. The battery cell stack includes a first battery cell stack installed in the first installation space and a second battery cell stack installed in the second installation space. The end of the first battery cell stack away from the second battery cell stack is provided with a first positive lead-out portion and a first negative lead-out portion, and the first positive lead-out portion and the first negative lead-out portion are placed at the two ends of the battery cell stack in the stacking direction of the soft-pack battery cells. The end of the second battery cell stack close to the first battery cell stack is provided with a second positive lead-out portion and a second negative lead-out portion, and the second positive lead-out portion and the second negative lead-out portion are placed at the two ends of the battery cell stack in the stacking direction of the soft-pack battery cells. A third positive electrode lead-out portion and a third negative electrode lead-out portion are provided at an end of the first battery cell stack close to the second battery cell stack, and the third positive electrode lead-out portion and the third negative electrode lead-out portion are adjacent to each other in the stacking direction of the soft-pack battery cells.

[0031] The electrode fixing assembly includes a first electrode fixing assembly, a second electrode fixing assembly, a third electrode fixing assembly, a fourth electrode fixing assembly and a fifth electrode fixing assembly. The bus bar bracket of the first electrode fixing assembly is directly fixed to the side beam or fixed to the side beam through a connecting structure, and the first positive lead-out portion is fixed to the bus bar of the first electrode fixing assembly. The bus bar bracket of the second electrode fixing assembly is directly fixed to the side beam or fixed to the side beam through a connecting structure, and the first negative lead-out portion is fixed to the bus bar of the second electrode fixing assembly. The bus bar bracket of the third electrode fixing assembly is directly fixed to the middle beam or fixed to the middle beam through a connecting structure, and the second positive lead-out portion is fixed to the bus bar of the third electrode fixing assembly. The bus bar bracket of the fourth electrode fixing assembly is directly fixed to the middle beam or fixed to the middle beam through a connecting structure, and the second negative lead-out portion is fixed to the bus bar of the fourth electrode fixing assembly. The busbar support of the fifth electrode fixing assembly is fixed to the middle beam directly or through a connecting structure, and the third positive electrode lead-out portion and the third negative electrode lead-out portion are respectively fixed to two separate busbars of the fifth electrode fixing assembly.

[0032] In the battery pack of an optional technical solution, an elastic member is provided between the second busbar support portion and the beam.

[0033] The utility model also provides an electric vehicle, which is integrated with a battery pack in any optional technical solution described above.

[0034] <Beneficial Effects>

[0035] By providing an electrode fixing assembly, the electrodes of the battery cell stack can be fixed without using an end plate assembly, so that the battery cell stack can be directly loaded into the box body, so as to fully utilize the space in the box body and improve the volume utilization rate and energy density. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the stacking distribution of the soft-pack CTP battery pack provided in some embodiments of the present utility model;

[0037] Figure 2 It is a schematic diagram of the stacking distribution of the soft-pack CTP battery pack provided in some embodiments of the present utility model;

[0038] Figure 3 Is to use Figure 1 Exploded diagram of the soft-pack CTP battery pack with the corresponding stack distribution;

[0039] Figure 4 It is a partial schematic diagram of a battery cell stack before being installed relative to a box body in some embodiments of the utility model;

[0040] Figure 5 It is a schematic diagram of the connection between the support base and the box body in some embodiments of the utility model;

[0041] Figure 6 yes Figure 5 A partial enlarged view of the C position in the middle;

[0042] Figure 7 is a schematic diagram of the connection between the second busbar support portion and the support base in some embodiments of the utility model;

[0043] Figure 8 is a schematic diagram of the connection between the first busbar support portion and the busbar in some embodiments of the utility model;

[0044] Fig. 9 It is a partial schematic diagram of a battery cell stack after being installed relative to a box body in some embodiments of the utility model;

[0045] Fig.10 is a three-dimensional diagram of a bus bar, a second bus bar support portion, and a support base connected together in some embodiments of the utility model;

[0046] Fig.11 for Fig.10 A top view of the structure shown in;

[0047] Fig.12 for Fig.11 A cross-sectional view of the structure shown in along BB;

[0048] Fig.13 is an axonometric view of an electrode fixing assembly in some embodiments of the present invention;

[0049] Fig.14 for Fig.13A front view of the structure shown in;

[0050] Fig.15 for Fig.14 A cross-sectional view of the XY plane of the structure shown in ;

[0051] Fig.16 This is a partial enlarged view of the battery cell stack;

[0052] Fig.17 is a schematic diagram of an electrical connection structure between two groups of battery cell stacks in some embodiments of the present utility model;

[0053] Fig.18 for Fig.17 A cross-sectional view of the structure shown in along BB;

[0054] Fig.19 Is to use Figure 1 Exploded diagram of the soft-pack CTP battery pack with the corresponding stack distribution;

[0055] Fig. 20 yes Fig.19 A partial enlarged view of

[0056] Fig.21 Schematic diagram of the electrical connection structure between two groups of battery cell stacks in some embodiments of the present invention

[0057] Fig. 22 Is to use Figure 2 Exploded diagram of the soft-pack CTP battery pack with the corresponding stack distribution;

[0058] Fig.23 It is a schematic diagram of the structure of the electrode fixing assembly in some embodiments of the utility model;

[0059] Fig.24 and Fig.25 for Fig.23 An exploded view of the structure shown in;

[0060] Fig.26 It is a schematic diagram of the structure of the electrode fixing assembly in some embodiments of the present utility model.

[0061] Reference numerals:

[0062] Box body 1, lower shell 12, lower shell bottom plate 121, side beam 122, box middle beam 123, upper cover 13, first chamber 21, second chamber 22, first battery cell stack 3, first output positive electrode 301, first output negative electrode 302, third output positive electrode 303, third output negative electrode 304, flexible circuit board 31, side plate 32, second battery cell stack 4, second output positive electrode 401, second output negative electrode 402, foam glue 5, transfer bus 6, soft-pack battery cell monomer 7;

[0063] [First embodiment]

[0064] Electrode fixing assembly 100, busbar bracket 8, first busbar support portion 81, first back plate 811, second back plate 812, side plate 813, through hole 814, rib 815, second busbar support portion 82, nut 821, partition 822, bolt 83, buckle 84, busbar 9, main body (plate-shaped main body) 91, fixing hole 911, folding portion (output connection portion) 92, opening 921, support seat 10, bayonet 101, plate portion 102;

[0065] [Second Embodiment]

[0066] Electrode fixing assembly 200, busbar bracket 8, first busbar support portion 81, back plate 501, through hole 502, retaining edge 503

[0067] Second busbar support portion 82, nut 821, side plate 203, back plate 204, upper plate 205, partition 2051, lower plate 206, buckle 2061, busbar 9, main body (plate-shaped main body) 91, folding portion (output connection portion) 92, opening 921, support seat 10, bayonet 101, plate portion 102;

[0068] [Third Embodiment]

[0069] Electrode fixing assembly 300, busbar bracket 8, bolt 83, busbar 9, transition busbar 601;

[0070] [Fourth Embodiment]

[0071] Electrode fixing assembly 400, busbar bracket 8, bolt 83, busbar 9, battery cell tab (electrode lead portion) 71;

[0072] [Fifth Embodiment]

[0073] Electrode fixing assembly 500, busbar bracket 8, first busbar support portion 81, mounting plate 801, through hole 8011, positioning hole 802, guide bar 803, second busbar support portion 82, nut 821, head 701, body 702, slot 703, busbar 9, main body (plate-shaped main body) 91, folding portion (output connection portion) 92, opening 921;

[0074] [Sixth Embodiment]

[0075] Electrode fixing assembly 600 , busbar bracket 8 , first busbar support portion 81 , second busbar support portion 82 , nut 821 , positioning block 901 , buckle 902 , busbar 9 . DETAILED DESCRIPTION

[0076] It should be noted that the working principle, characteristics and advantages of the battery pack according to the present application will be explained below in an illustrative manner, but it should be understood that all descriptions are given for illustrative purposes only and should not be construed as forming any limitations on the present application.

[0077] In addition, for any single technical feature described or implied in the embodiments mentioned in this document, or any single technical feature displayed or implied in the accompanying drawings, the present application still allows for continued arbitrary combination or deletion between these technical features (or their equivalents) without any technical obstacles, thereby obtaining more other embodiments of the present application that may not be directly mentioned in this document.

[0078] <Term>

[0079] The X-axis direction in this article refers to the length direction of the soft-pack battery cell monomer, the Y-axis direction refers to the stacking direction of the soft-pack battery cell monomer, and the Z-axis direction refers to the direction perpendicular to the plane determined by the X-axis and the Y-axis.

[0080] The "upper" in this article refers to the direction away from the bottom plate of the lower shell in the Z-axis direction, and the "lower" refers to the direction close to the bottom plate of the lower shell in the Z-axis direction.

[0081] <Overview>

[0082] Generally referring to the figures, according to exemplary embodiments, a soft-pack CTP (Cell to Pack) battery pack, a cell stack, and a component for fixing the output electrode of the cell stack are shown. By providing an electrode fixing component, the electrode of the cell stack can be fixed without using an end plate component, so that the cell stack can be directly loaded into the box body, so as to make full use of the space in the box body and improve the volume utilization rate.

[0083] <Battery cell stack distribution>

[0084] Figure 1 It is a schematic diagram of the stacking distribution of soft-pack CTP battery packs provided in some embodiments of the present invention.

[0085] refer to Figure 1 In some embodiments of the present invention, the soft-pack CTP battery pack includes a square box body 1 and a square battery cell stack. The internal space of the box body 1 can accommodate two groups of battery cell stacks (3, 4) placed side by side.

[0086] The two groups of battery cell stacks (3, 4) are a first battery cell stack 3 and a second battery cell stack 4. The first battery cell stack 3 is provided with a first output positive electrode 301 and a first output negative electrode 302 at both ends of a side adjacent to the second battery cell stack 4. Correspondingly, the second battery cell stack 4 is provided with a second output positive electrode 401 and a second output negative electrode 402 at both ends of a side adjacent to the first battery cell stack 3. The positions of the first output positive electrode 301 and the second output negative electrode 402 correspond to each other, and the positions of the first output negative electrode 302 and the second output positive electrode 401 correspond to each other, thereby reducing the wiring length and facilitating the series electrical connection between the two groups of battery cell stacks (3, 4).

[0087] In addition, the first battery cell stack 3 is also provided with a third output positive electrode 303 and a third output negative electrode 304 adjacent to each other at one end away from the second battery cell stack 4. The first output positive electrode 301, the first output negative electrode 302, the second output positive electrode 401 and the second output negative electrode 402 are used as electrodes electrically connected in series inside the two groups of battery cell stacks (3, 4), and the third output positive electrode 303 and the third output negative electrode 304 are used as output electrodes of the entire soft-pack CTP battery pack. In some embodiments, the third output positive electrode 303 and the third output negative electrode 304 are electrically connected to the battery pack disconnecting unit (BDU), and then the whole vehicle is powered by the battery pack disconnecting unit.

[0088] The output electrodes provided by the above distribution and electrical connection, namely the third output positive electrode 303 and the third output negative electrode 304 are adjacent to each other. In some cases, when the output electrodes of the entire soft-pack CTP battery pack need to be away from each other, the first battery cell stack 3 can be relatively Figure 1 Rotate 180° and place it in the box 1, so as to obtain Figure 2 The assembly structure shown.

[0089] refer to Figure 2 , the third output positive electrode 303 and the third output negative electrode 304 are rotated to a position adjacent to the second battery cell stack 4, the third output positive electrode 303 and the second output negative electrode 402 are electrically connected through the adapter bus 6, and the third output negative electrode 304 and the second output positive electrode 401 are electrically connected through another adapter bus 6, thereby realizing a high-voltage electrical connection between the first battery cell stack 3 and the second battery cell stack 4. The first output positive electrode 301 and the first output negative electrode 302 can then serve as the output electrodes of the entire soft-pack CTP battery pack. By using the first battery cell stack 3 and the adapter bus 6 with the above-mentioned electrode distribution, the installation angle of the first battery cell stack 3 can be flexibly adjusted to meet the requirements of different output electrode positions.

[0090] The above examples illustrate the distribution mode and electrical connection mode of the first battery cell stack 3 and the second battery cell stack 4 in some embodiments of the present invention. It can be understood that the above description is only exemplary and should not be understood as a limitation on the distribution mode and electrical connection mode. In other embodiments of the present invention, the first battery cell stack 3 and the second battery cell stack 4 can also be integrated into a single-row battery cell stack, and the setting position of each output electrode of the battery cell stack can also be flexibly adjusted according to actual needs.

[0091] Figure 3 Is to use Figure 1 Exploded diagram of the soft-pack CTP battery pack with corresponding stacking distribution.

[0092] refer to Figure 3 The square box 1 includes a lower shell 12 and an upper cover 13. The lower shell 12 includes a rectangular lower shell bottom plate 121 and four side beams 122. The four side beams 122 are respectively fixed to the four sides of the rectangular lower shell bottom plate 121. The four side beams 122, the lower shell bottom plate 121 and the upper cover 13 together enclose a chamber for accommodating the battery cell stack. In addition to the four side beams 122, the box 1 also includes a box middle beam 123 arranged in the center of the length direction of the box 1. The box middle beam 123 divides the chamber into a first chamber 21 and a second chamber 22. The first chamber 21 is used to accommodate the first battery cell stack 3, and the second chamber 22 is used to accommodate the second battery cell stack 4.

[0093] The bottom of the battery cell stack is directly bonded and fixed to the bottom plate 121 of the lower shell body by heat-conductive structural adhesive. In order to stabilize the battery cell stack and enhance the overall strength of the battery pack, foam glue 5 is also filled between the battery cell stack and the side beam 122 or the middle beam 123 of the box body. A structural adhesive or elastomer component (not shown) is provided on the top of the battery cell stack to fill the gap between the battery cell stack and the upper cover 13. By using the heat-conductive structural adhesive, foam glue 5 between the bottom of the battery cell stack and the bottom plate 121 of the lower shell body, and the structural adhesive or elastomer component provided on the top of the battery cell stack, a stable and buffering support can be formed for the battery cell stack from all directions. In some embodiments, the elastomer component can be composited with fireproof materials such as foam and mica, and double-sided adhesive or hot melt adhesive is provided between the elastomer component and the battery cell stack.

[0094] The four side beams 122 include two long side beams extending along the X-axis direction and two short side beams extending along the Y-axis direction. An electrode fixing assembly is disposed inside the middle of the short side beam adjacent to the first battery cell stack 3, and the third output positive electrode 303 and the third output negative electrode 304 are both fixedly connected to the electrode fixing assembly.

[0095] An electrode fixing assembly is provided on the middle beam 123 of the box body. The busbar connected to the first output positive electrode 301 and the busbar connected to the second output negative electrode 402 are electrically connected and fixed to one of the electrode fixing assemblies. The busbar connected to the first output negative electrode 302 and the busbar connected to the second output positive electrode 401 are electrically connected and fixed to another of the electrode fixing assemblies. In this way, the electrical connection between the first battery cell stack 3 and the second battery cell stack 4 is achieved through the two electrode fixing assemblies.

[0096] There are many specific implementations of the electrode fixing assembly, which will be described in detail below.

[0097] <Cell stack structure>

[0098] Continue to refer Figure 3 In this embodiment, the battery cell stack is formed by stacking a plurality of soft-pack battery cells 7. The stacking direction is the Y-axis direction, which is the thickness direction of the soft-pack battery cell 7 and the width direction of the box 1. The length direction of the soft-pack battery cell 7 is the X-axis direction, which is also the length direction of the box 1. The top and bottom of each soft-pack battery cell 7 are insulated and protected by full-covering insulating tape (not shown in the figure).

[0099] <Electrode Fixing Assembly 100>

[0100] First embodiment

[0101] The electrode fixing assembly 100 in this embodiment can be used for Figure 1 The third output positive electrode 303 and the third output negative electrode 304 shown in FIG.

[0102] Figure 4 This is a partial schematic diagram of the battery stack before installation relative to the box. Figure 4 The electrode fixing assembly 100 includes: a busbar bracket 8, a busbar 9 and a support seat 10. The busbar bracket 8 includes a first busbar support portion 81 and a second busbar support portion 82, and the second busbar support portion 82 includes an embedded nut 821 therein.

[0103] Figure 5 is a schematic diagram of the connection between the support base 10 and the box body 1, Figure 6 yes Figure 5 A partial enlarged view of the C position in the middle. Figure 5 and Figure 6 The support seat 10 is rectangular and is arranged on the inner wall surface of the side beam 122 of the box body 1. A bayonet 101 is arranged on the outer wall. Two plate portions 102 extending on the plane determined by the X-axis and the Z-axis are arranged inside. Figure 7As shown, the support seat 10 and the second busbar support portion 82 can be connected together by means of snap connection, etc. The support seat 10 is a metal structure, which can be integrally formed and arranged on the side beam 122 or welded and fixed on the side beam 122.

[0104] Figure 8 for Figure 5 , which is a partial enlarged view showing the state where the first busbar support portion 81 and the busbar 9 are connected together.

[0105] The first busbar support portion 81 includes back plates 811, 812 extending in the Z-axis direction, and side plates 813 formed by bending the two sides of the back plates 811, 812. The back plate is composed of a first back plate 811 and a second back plate 812 connected together at the upper edges and arranged side by side, so that the back plate as a whole is comb-shaped. The two busbars 9 can be connected to the first back plate 811 and the second back plate 812 respectively.

[0106] The busbar 9 includes a main body 91 extending in the Z-axis direction and a folded portion 92 formed by folding the upper end of the main body 91 forward. The folded portion 92 is provided with an opening 921 .

[0107] The main body 91 is provided with a fixing hole 911 , and the busbar 9 is connected and fixed to the first busbar support portion 81 through the fixing hole 911 .

[0108] The opening 921 on the folded portion 92 can be a round hole or a waist hole. Preferably, the opening 921 is a waist hole extending along the Y-axis direction. When the opening 921 is a waist hole, even if the battery cell stack moves in the Y-axis direction, the busbar 9 can be locked by connecting bolts through the waist hole to absorb manufacturing tolerances.

[0109] The first back plate 811 and the second back plate 812 of the first busbar support portion 81 are both provided with through holes 814 for the cell tabs (not shown) of the third output positive electrode 303 and the third output negative electrode 304 to pass through. The length of the through hole 814 extending in the Z-axis direction is greater than the width of the cell tab in the Z-axis direction, so as to ensure that the cell tab can pass through the through hole along the X-axis direction and be rolled and bent in the Y-axis direction to fit with the busbar 9 and be welded.

[0110] A rib 815 is provided between the through hole 814 on the first back plate 811 and the second back plate 812 to prevent the battery cell tabs of the third output positive electrode 303 and the third output negative electrode 304 from overlapping and short-circuiting. Preferably, the height of the rib 815 in the Z-axis direction is 2-4 mm to better prevent the occurrence of a short circuit and improve the reliability of the battery.

[0111] Fig. 9 1 is a partial schematic diagram of the battery cell stack after installation relative to the box body 1. Fig. 9 As shown, the busbar 9 is overlapped and fixed on the second busbar support portion 82 in the form of an opening 921 thereof overlapping the nut 821 .

[0112] Fig.10 is a three-dimensional diagram of the bus 9, the second bus support portion 82, and the support seat 10 connected together, Fig.11 for Fig.10 A top view of the structure shown in Fig.12 for Fig.11 The structure shown in the figure is a cross-sectional view along BB. Figures 10 to 12 The support seat 10 is fixed on the inner surface of the side beam 122 of the box body 1. A bayonet 101 is provided on the peripheral wall of the support seat 10, and a buckle 84 that cooperates with the bayonet 101 is provided on the second bus support portion 82. Through the cooperation between the buckle 84 and the bayonet 101, and the supporting effect of the plate portion 102 on the second bus support portion 82, the second bus support portion 82 is fixedly connected to the upper end of the support seat 10. The two busbars 9 are overlapped on the upper surface of the second bus support portion 82 and contact with the nut 821. The bolt 83 passes through the opening 921 of the busbar 9 and is fastened together with the nut 821. The middle part of the second bus support portion 82 has a partition 822 in the form of a protrusion extending upward, and the partition 822 separates the two busbars 9.

[0113] Preferably, the nut 821 is 0.3-0.5 mm higher than the upper surface of the second bus support portion 82 in the Z-axis direction, that is, the vertical distance difference between the upper end surface of the nut 821 and the upper surface of the second bus support portion 82 is 0.3-0.5 mm, to ensure that the bus 9 can be overlapped with the nut 821 first.

[0114] Preferably, the thickness of the plastic wall at the position of the second busbar support portion 82 corresponding to the nut 821 is 1.2-1.8 mm.

[0115] In this embodiment, the second busbar support portion 82 is first fixed to the support seat 10, and the cell tabs of the third output positive electrode 303 and the third output negative electrode 304 are connected to the busbar 9 fixed to the first busbar support portion 81. Then, the cell stack and the busbar 9 fixed to the first busbar support portion 81 are integrally installed in the box body 1, so that the busbar 9 and the second busbar support portion 82 are overlapped and fixed together.

[0116] Although in the above, for fixing Figure 1The electrode fixing assembly 100 in this embodiment is described by taking the third output positive electrode 303 and the third output negative electrode 304 shown in the figure as an example, but the present application is not limited thereto. As long as the output electrode can be fixed by using the electrode fixing assembly 100 as described above, there is no particular limitation on the specific position of the output electrode in the box body 1. For example, in some embodiments, the electrode fixing assembly 100 provided in this embodiment can be used to fix the output electrode as shown in the figure. Figure 2 The third output positive electrode 303 and the third output negative electrode 304 shown in the figure can be obtained by simply moving the support seat 10 from the position of the side beam 122 to the position of the middle beam 123 of the box body. For another example, in some embodiments, the electrode fixing assembly 100 provided in this embodiment can be used to fix the electrode fixing assembly 100 provided in the embodiment. Figure 2 The third output positive electrode 303 and the third output negative electrode 304 are shown in the figure, and considering that the output electrode is located in the middle of the box body 1, it is possible to choose to cancel the use of the support base 10 mentioned above, or to integrate the support base 10 into the middle beam 123 of the box body and become a part of the middle beam 123 of the box body.

[0117] Second embodiment

[0118] The electrode fixing assembly 200 in this embodiment can be used for Figure 2 The third output positive electrode 303 and the third output negative electrode 304 shown in FIG.

[0119] Fig.13 is an axonometric view of the electrode fixing assembly 200 in this embodiment, Fig.14 for Fig.13 A front view of the structure shown in FIG. Fig.15 for Fig.14 The Z-direction cross-sectional view of the structure shown in Fig.16 This is a partial enlarged view of the battery cell stack.

[0120] refer to Figures 13 to 16 The electrode fixing assembly 200 includes: a busbar bracket 8 and a busbar 9. The busbar bracket 8 includes a first busbar support portion 81 and a second busbar support portion 82, and the second busbar support portion 82 includes an embedded nut 821 therein. The first busbar support portion 81 and the second busbar support portion 82 are integrated into an integrated component and injection molded, and the busbar 9 is embedded and fixed on the busbar bracket 8.

[0121] The second busbar support part 82 includes: two side plates 203 arranged opposite to each other in the Y-axis direction; two separated back plates 204 formed by folding the rear ends of the two side plates 203 inwardly opposite to each other; and an upper plate 205 and a lower plate 206 arranged opposite to each other in the Z-axis direction. The nut 821 is arranged in the space between the upper plate 205 and the lower plate 206. The nut 821 is integrated with the second busbar support part 82 as an integrated component and injection molded. The middle part of the upper plate 205 is connected to the back plate 501 of the first busbar support part 81. By integrating the first busbar support part 81 and the second busbar support part 82 into an integrated component and injection molding, it can be ensured that the busbar 9 and the nut 821 can be accurately aligned. In addition, before installing the battery cell stack into the box body 1, the busbar 9 and the nut 821 can be locked by bolts or the like to avoid the situation where the output pole vacancy does not match during the assembly process.

[0122] In this embodiment, the structures of the first busbar support portion 81 and the busbar 9 are similar to those described in the first embodiment. Fig.14 and Fig.15 , two through holes 502 are provided on the back plate 501 of the first busbar support part 81 for the battery cell tabs of the third output positive electrode 303 and the third output negative electrode 304 to pass through. The length of the through hole 502 extending in the Z-axis direction is greater than the width of the battery cell tabs of the third output positive electrode 303 and the third output negative electrode 304 in the Z-axis direction to ensure that the battery cell tabs can pass through the through hole 502. In addition, a rib 503 is provided between the two through holes 502 to avoid overlapping short circuits between the battery cell tabs of the third output positive electrode 303 and the third output negative electrode 304. Preferably, the height of the rib 503 on the Z-axis is 2-4 mm to better avoid the occurrence of short circuits and improve the reliability of the battery.

[0123] refer to Fig.13 The busbar 9 is fixed to the first busbar support portion 81 by hot riveting or snap fastening, and the folded portions 92 of the two busbars 9 are respectively overlapped on the upper surface of the upper plate 205 of the second busbar support portion 82. A convex partition 2051 is formed in the middle of the upper plate 205 to separate the two busbars 9.

[0124] The lower ends of the two side plates 203 of the second busbar support portion 82 are provided with buckles 2061, and the box body 1 is provided with a connecting structure that cooperates with the buckles 2061. The electrode fixing assembly 200 is connected and fixed to the middle beam 123 of the box body by using the buckles 2061.

[0125] Preferably, the nut 821 is 0.3-0.5 mm higher than the upper surface of the upper plate 205 of the second bus support portion 82 in the Z-axis direction, that is, the vertical distance difference between the upper end surface of the nut 821 and the upper surface of the upper plate 205 is 0.3-0.5 mm, to ensure that the bus 9 can be overlapped with the nut 821 first.

[0126] Preferably, the thickness of the plastic wall at the position of the second busbar support portion 82 corresponding to the nut 821 is 1.2-1.8 mm.

[0127] Preferably, the busbar bracket 8 is a plastic busbar bracket, the heat deformation temperature of the plastic busbar bracket is ≥100°C, and the flame retardancy meets the UL94 V0 grade. The plastic busbar bracket can be made of materials such as polyamide resin (PA66) or polybutylene terephthalate (PBT).

[0128] Preferably, a foam glue 5 is provided between the cell tabs of the cell stack and the box body 1 , and the foam glue 5 can wrap at least a portion of the cell tabs and the busbar 9 .

[0129] In this embodiment, the electrode fixing assembly 200 is connected to the output pole of the battery cell stack, and the busbar 9 and the nut 821 are locked by bolts or the like. Then the electrode fixing assembly 200 and the battery cell stack are installed as a whole to the box body 1, and are connected and fixed to the box body 1. By locking the busbar 9 and the nut 821 by bolts or the like before the battery cell stack enters the box body 1, it is possible to avoid the situation where the output pole vacancy does not match during the assembly process. In other words, by integrating the first busbar support portion 81 and the second busbar support portion 82 into an integrated component and injection molding, it is beneficial to accurately position the busbar 9 and the second busbar support portion 82, so that the busbar 9 and the transfer busbar 6 can be accurately fixed.

[0130] Although in the above, for fixing Figure 2 The electrode fixing assembly 200 in this embodiment is described by taking the third output positive electrode 303 and the third output negative electrode 304 as examples, but the present application is not limited thereto. As long as the output electrode can be fixed by using the electrode fixing assembly 200 as described above, there is no particular limitation on the specific position of the output electrode in the box body 1. For example, in some embodiments, the electrode fixing assembly 200 provided in this embodiment can be used to fix the output electrode. Figure 1 The third output positive electrode 303 and the third output negative electrode 304 shown in the figure only need to be provided with a fixing structure matched with the electrode fixing assembly 200 on the side beam 122 of the box body 1 .

[0131] Third embodiment

[0132] The electrode fixing assembly 300 in this embodiment can be used for Figure 1 The first output positive electrode 301 and the second output negative electrode 402 shown in the figure are fixed, or used to Figure 1 The first output negative electrode 302 and the second output positive electrode 401 shown in FIG.

[0133] Fig.17 is a schematic diagram of the electrode fixing assembly 300 in this embodiment, showing the electrical connection structure between the two groups of battery cell stacks 3 and 4. Fig.18 for Fig.17 The structure shown in is a cross-sectional view along BB.

[0134] refer to Fig.17 and Fig.18 The electrode fixing assembly 300 includes: a busbar bracket 8, a busbar 9 and a transition busbar 601. The busbar bracket 8 can be fixed to the middle beam 123 of the box body 1, and includes a pre-embedded nut arranged therein. There are two busbars 9, one of which is connected to the first battery cell stack 3, and the other is connected to the second battery cell stack 4. The transition busbar 601 is overlapped with both busbars 9.

[0135] In this embodiment, when the first battery cell stack 3 and the second battery cell stack 4 are installed in the box 1, the two busbars 9 connected to the two battery cell stacks 3 and 4 are first fixed to the busbar bracket 8 in a form corresponding to the nuts. Then the transition busbar 601 is installed, and the bolts 83 are passed through the transition busbar 601, the busbar 9 and the nuts in sequence, and then the bolts 83 are tightened. In this way, the high-voltage electrical connection between the two battery cell stacks 3 and 4 can be achieved.

[0136] The electrical connection structure in this embodiment can realize high-voltage connection between different battery cell stacks in the soft-pack CTP, and the wiring distance is short, which is conducive to improving the stability of the electrical connection and reducing electrical risks. After the battery cell stack is installed into the box 1, it is only necessary to connect and lock the bus bars 9 to each other to complete the installation, which simplifies the installation process. In addition, the electrical connection structure is simple and small in size, and there are basically no redundant structural parts, which can reduce the occupation of the space inside the box 1 by the structural parts, thereby reducing the occupied volume of the electrical connection structure in the box 1. In addition, since a transition bus 601 is provided and connected to the two bus bars 9 through the transition bus 601, the requirements for part accuracy can be reduced to a certain extent, which is conducive to improving manufacturing and installation efficiency, and reducing manufacturing and installation costs.

[0137] Although in the above, for fixing Figure 1 The first output positive electrode 301 and the second output negative electrode 402 shown in FIG. Figure 1The electrode fixing assembly 300 in this embodiment is described by taking the first output negative electrode 302 and the second output positive electrode 401 shown in the figure as an example, but the present application is not limited thereto. As long as the output electrode can be fixed using the electrode fixing assembly 300 as described above, the specific position of the output electrode in the box body 1 is not particularly limited.

[0138] Fourth embodiment

[0139] The electrode fixing assembly 400 in this embodiment can be used for Figure 1 The first output positive electrode 301 and the second output negative electrode 402 shown in the figure are fixed, and are used to Figure 1 The first output negative electrode 302 and the second output positive electrode 401 shown in FIG.

[0140] Fig.19 Is to use Figure 1 Exploded diagram of the soft-pack CTP battery pack with corresponding stacking distribution. Fig. 20 yes Fig.19 A partial enlarged view showing the structural schematic diagram of the electrode fixing assembly 400 in this embodiment. Fig.21 is a schematic diagram of the electrode fixing assembly 400 in this embodiment, showing the electrical connection structure between the two groups of battery cell stacks 3 and 4.

[0141] refer to Figures 19 to 21 The electrode fixing assembly 400 includes a busbar bracket 8 and a busbar 9. The busbar bracket 8 can be fixed to the middle beam 123 of the box body 1, and includes a pre-embedded nut arranged therein. There are two busbars 9, one of which is connected to the cell tab 71 of the first output positive electrode 301, and the other is connected to the cell tab 71 of the second output negative electrode 402, or one is connected to the cell tab 71 of the first output negative electrode 302, and the other is connected to the cell tab 71 of the second output positive electrode 401.

[0142] In this embodiment, during the process of installing the two groups of battery cell stacks 3 and 4 into the box 1, the busbar 9 connected to the battery cell stack that enters the box 1 first is overlapped on the busbar bracket 8, and the busbar 9 connected to the battery cell stack that is installed later is overlapped on the busbar 9 connected to the battery cell stack that enters the box first. In this way, the position of one busbar 9 on the busbar bracket 8 will be higher than the position of the other busbar 9 on the busbar bracket 8 in the Z-axis direction. More specifically, the position of the busbar 9 connected to the battery cell stack that enters the box 1 later on the busbar bracket 8 is higher than the position of the busbar 9 connected to the battery cell stack that is installed first on the busbar bracket 8. After the two busbars 9 connected to the two groups of battery cell stacks 3 and 4 are overlapped on the busbar bracket 8, the bolts 83 are passed through the two directly overlapped busbars 9 and nuts in turn, and then they are locked with the bolts 83. In this way, high voltage electrical connection can be achieved between the two groups of battery cell stacks 3 and 4. The electrical connection structure in this embodiment eliminates the transition busbar 601 in the above embodiment 3, so the installation space requirement is smaller and the insulation risk is lower.

[0143] Although in the above, for fixing Figure 1 The first output positive electrode 301 and the second output negative electrode 402 shown in Figure 1 The electrode fixing assembly 400 in this embodiment is described by taking the first output negative electrode 302 and the second output positive electrode 401 shown in the figure as an example, but the present application is not limited thereto. As long as the output electrode can be fixed using the electrode fixing assembly 400 as described above, the specific position of the output electrode in the box body 1 is not particularly limited.

[0144] Fifth embodiment

[0145] The electrode fixing assembly 500 in this embodiment can be used for Figure 2 The first output positive electrode 301 and the first output negative electrode 302 shown in the figure are fixed, and / or used for Figure 2 The second output positive electrode 401 and the second output negative electrode 402 shown in the figure are fixed.

[0146] Fig. 22 Is to use Figure 2 Exploded view of a soft-pack CTP battery pack with a corresponding stack distribution. In this soft-pack CTP structure, most of the internal space of the box 1 is used to place the battery cell stack, so the installation and placement space for the remaining mounting parts is limited. Through the highly integrated and small-volume electrode fixing assembly, redundant mounting parts are eliminated, thereby effectively reducing the installation space required for the output pole and the difficulty of installing the output pole, maximizing the use of the volume space in the box 1.

[0147] Fig.23is a schematic diagram showing the structure of the electrode fixing assembly 500 in this embodiment, Fig.24 and Fig.25 for Fig.23 Exploded view of the structure shown in .

[0148] refer to Figure 23 to Figure 25 The electrode fixing assembly 500 includes: a busbar bracket 8 and a busbar 9. The busbar bracket 8 includes a first busbar support portion 81 and a second busbar support portion 82, and the second busbar support portion 82 includes an embedded nut 821 therein.

[0149] The first busbar support portion includes a mounting plate 801, a pair of positioning holes 802 and a pair of guide bars 803. The pair of guide bars 803 are formed by folding the two sides of the mounting plate 801 in the same direction in the X-axis direction. The guide bar 803 has a length in the Z-axis direction and a width in the X-axis direction. A pair of protrusion structures are arranged above the guide bar 803, and a pair of positioning holes 802 are opened on the upper surface of the pair of protrusion structures. The busbar 9 is connected to the mounting plate 801 of the first busbar support portion 81 by hot riveting, snap-fitting, integral injection molding, etc. A through hole 8011 is opened on the mounting plate 801, and the through hole 8011 is used for the battery cell ear of the output pole to pass through and be welded to the busbar 9.

[0150] The second bus support portion 82 includes a head 701 and a body 702. One end of the body 702 is connected to the head 701, and the other end extends downward along the Z-axis direction. An embedded nut 821 is embedded in the head 701. The upper surface of the head 701 is overlapped with the folded portion 92 of the bus 9. Slots 703 are provided on both sides of the body 702. The slot width of the slot 703 matches the thickness of the guide bar 803, so that the slot 703 can be plugged and matched with the guide bar 803, thereby insulating a part of the earphones of the bus 9 from being arranged in the first bus support portion 81 and the second bus support portion 82. The slot width at the upper port of the slot 703 is slightly larger than the slot width of the main body of the slot 703.

[0151] During installation, by inserting the tool into the positioning hole 802 and limiting the position, the bus 9 and the first bus support portion 81 can be prevented from shaking during installation, thereby improving the installation accuracy. Through the cooperation of the guide bar 803 and the slot 703, the assembly process between the first bus support portion 81 and the second bus support portion 82 can be made more convenient and smooth. After the first bus support portion 81 and the second bus support portion 82 are assembled together, the bus 9 can be better positioned between the first bus support portion 81 and the second bus support portion 82.

[0152] The arrangement of the guide bar 803 and the positioning hole 802 makes the position of the battery cell stack more accurate during installation, and the installation process is more convenient, reducing the difficulty and cost of installation. In addition, the guide bar 803 can not only limit the first busbar support portion 81 and the second busbar support portion 82, but also insulate and protect the busbar 9 to prevent the busbar 9 from contacting the side beam 122 of the box body 1.

[0153] In this embodiment, the second busbar support portion 82 can be pre-installed on the box body 1 (structures on the box body middle beam 123 and / or side beam 122). When the battery cell stack is put into the box, the first busbar support portion 81 connected to the battery cell stack can be matched with the second busbar support portion 82 for installation.

[0154] Although in the above, for fixing Figure 2 The first output positive electrode 301 and the first output negative electrode 302 shown in FIG. Figure 2 The electrode fixing assembly 500 in this embodiment is described by taking the second output positive electrode 401 and the second output negative electrode 402 shown in the figure as an example, but the present application is not limited thereto. As long as the output electrode can be fixed using the electrode fixing assembly 500 as described above, the specific position of the output electrode in the box body 1 is not particularly limited.

[0155] Sixth Embodiment

[0156] The electrode fixing assembly 600 in this embodiment can be used for Figure 2 The first output positive electrode 301 and the first output negative electrode 302 shown in the figure are fixed, or used for Figure 2 The second output positive electrode 401 and the second output negative electrode 402 shown in the figure are fixed.

[0157] Fig.26 is a schematic diagram showing the structure of the electrode fixing assembly 600 in this embodiment. Fig.26 The electrode fixing assembly 600 includes: a busbar bracket 8 and a busbar 9. The busbar bracket 8 includes a first busbar support portion 81 and a second busbar support portion 82, and the second busbar support portion 82 includes an embedded nut 821 therein. The first busbar support portion 81 and the second busbar support portion 82 are integrated components and are injection molded.

[0158] The busbar 9 is connected to the first busbar support portion 81 by means of heat riveting, snap fastening, integral injection molding, etc. A positioning block 901 and a snap fastening 902 are provided on the side of the busbar support 8 .

[0159] Since the first busbar support portion 81 and the second busbar support portion 82 are integrated, during the manufacturing process, there is no need to perform the step of aligning the busbar 9 with the embedded nut 821 in the second busbar support portion 82, thereby simplifying the manufacturing process and enhancing manufacturability.

[0160] In this embodiment, the output pole assembly 600 is pre-installed during installation, and after the battery cell pole ear is welded to the bus 9, the battery cell stack is installed into the box. During installation, the position of the bus bracket 8 is controlled by clamping the positioning block 901 on the tooling. After the installation is completed, the bus bracket 8 can be smoothly fixed with the box body 1 (the structure on the middle beam 123 and / or the side beam 122 of the box body) using the buckle 902. In other words, the installation between the output pole assembly 600 and the box body 1 can be achieved when the battery cell stack is put into the box.

[0161] Although in the above, for fixing Figure 2 The first output positive electrode 301 and the first output negative electrode 302 shown in FIG. Figure 2 The electrode fixing assembly 600 in this embodiment is described by taking the second output positive electrode 401 and the second output negative electrode 402 shown in the figure as an example, but the present application is not limited thereto. As long as the output electrode can be fixed using the electrode fixing assembly 600 as described above, the specific position of the output electrode in the box body 1 is not particularly limited.

[0162] Among them, in Figure 2 In the arrangement, the bus 9 on the electrode fixing assembly 500 or the bus 9 on the electrode fixing assembly 600 is electrically connected to the bus 9 on the electrode fixing assembly 100 or the bus 9 on the electrode fixing assembly 200 via the adapter bus 6, and the adapter bus 6 is supported and fixed on the bus bracket 8 of the above-mentioned electrode fixing assembly.

[0163] It should also be noted that the above provides a variety of implementation methods of the electrode fixing assembly, wherein the busbar bracket of the electrode fixing assembly can be a split style or an integrated style. The split style busbar bracket can be installed corresponding to the side beam of the box, or it can be installed corresponding to the middle beam of the box. The integrated style busbar bracket can also be installed corresponding to the side beam of the box, or it can be installed corresponding to the middle beam of the box. In other words, the different styles of the busbar bracket (split or integrated) have no correlation with the installation position (side beam or middle beam) adapted to it in the box. In addition, the electrode fixing assemblies 100-600 can all be used as a transfer fixing assembly between two battery cell stacks or as an output pole fixing assembly for the entire battery pack.

[0164] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: include: The box body, including the bottom plate; A battery cell stack is located in the box and is formed by stacking a plurality of soft-pack battery cells. The battery cell stack is provided with an electrode lead-out portion at an end portion in the length direction of the soft-pack battery cells. Thermally conductive structural adhesive, the thermally conductive structural adhesive is directly bonded between the battery cell stack and the bottom plate; The electrode fixing assembly is located at the end of the battery cell stack where the electrode lead-out portion is formed, and includes a busbar and a busbar bracket supporting the busbar. The busbar bracket is cooperatively connected to the box body, and the electrode lead-out portion is fixed to the busbar.

2. The battery pack according to claim 1, characterized in that: The box body includes a beam fixed to the bottom plate, The busbar support includes a nut member embedded in the busbar support. The busbar support is fixed to the beam directly or through a connecting structure. The busbar is connected to the busbar bracket in a manner corresponding to the arrangement of the nut member.

3. The battery pack according to claim 2, characterized in that: The busbar comprises a plate-shaped body and an output connection portion, wherein the output connection portion is formed by bending and extending the end of the plate-shaped body. The busbar support includes a first busbar support portion and a second busbar support portion, wherein the second busbar support portion includes the nut member embedded therein and is directly fixed to the beam or fixed to the beam through a connecting structure. The plate-shaped body is fixedly connected to the first busbar support portion in a surface-to-surface manner. The output connection portion is fixedly connected to the second busbar support portion in a form of overlapping the nut member.

4. The battery pack according to claim 3, characterized in that: The output connection portion is provided with a waist hole, and the waist hole has a length extending along the stacking direction of the soft-pack battery cells. The output connection portion is fixedly connected to the second busbar support portion by means of a bolt which passes through the waist hole and the nut member in sequence.

5. The battery pack according to claim 3, characterized in that: The first busbar support portion has a baffle, the baffle is located between the battery cell stack and the busbar, and the plate-shaped body is attached to a surface of the baffle parallel to the stacking direction of the soft-pack battery cells.

6. The battery pack according to claim 3, characterized in that: The second busbar supporting portion has a buckle matched with the beam or the connecting structure.

7. The battery pack according to claim 3, characterized in that: The top of the nut member is higher than the upper surface of the second busbar support portion close to the output connection portion in the vertical direction, and a vertical distance difference D between the top of the nut member and the upper surface of the second busbar support portion satisfies 0.3mm≤D≤0.5mm.

8. The battery pack according to claim 7, characterized in that: A thickness H of a wall of the second busbar supporting portion at a position corresponding to the nut satisfies 1.2 mm ≤ H ≤ 1.8 mm.

9. The battery pack according to any one of claims 1 to 3, characterized in that: The space between the battery cell stack and the beam is filled with foam glue, and the foam glue can wrap at least a portion of the electrode lead-out portion and at least a portion of the busbar.

10. The battery pack according to claim 3, characterized in that: There are two buses. The first busbar support portion is provided with a first partition portion of the plate-shaped body that separates two busbars. The second busbar support portion is provided with a second partition portion that separates the output connection portions of the two busbars.

11. The battery pack according to claim 10, characterized in that: The first busbar supporting portion is provided with two through holes for the electrode lead-out portion to pass through, and the two through holes are respectively disposed on two sides of the first partition portion.

12. The battery pack according to claim 2, characterized in that: The busbar bracket is provided with a positioning block for tooling to clamp.

13. The battery pack according to claim 2, characterized in that: The top of the busbar bracket is provided with a positioning hole for inserting a tool.

14. The battery pack according to claim 3, characterized in that: One of the first busbar supporting portion and the second busbar supporting portion is provided with a guide bar, and the other is provided with a slot that matches and plugs with the guide bar.

15. The battery pack according to claim 3, characterized in that: The first busbar support portion is provided with a through hole for the electrode lead-out portion to pass through.

16. The battery pack according to any one of claims 3 to 8, 10, 11, 14 and 15, characterized in that: The first busbar supporting portion and the second busbar supporting portion are integrally formed.

17. The battery pack according to claim 11, characterized in that: The battery cell stack is provided with two electrode lead-out portions at one end portion in the length direction of the soft-pack battery cell. The two electrode lead-out portions have opposite positive and negative polarities and are adjacent to each other in the stacking direction of the soft-pack battery cells. The two electrode lead-out portions pass through the two through holes respectively and are fixed to the two bus bars respectively.

18. The battery pack according to any one of claims 12 to 15, characterized in that: The battery cell stack is provided with two electrode lead-out portions at one end portion in the length direction of the soft-pack battery cell. The two electrode lead-out portions have opposite positive and negative polarities and are disposed at two ends of the battery cell stack in the stacking direction of the soft-pack battery cells. There are two electrode fixing assemblies, one electrode lead-out portion is fixed to the busbar of one electrode fixing assembly, and the other electrode lead-out portion is fixed to the busbar of the other electrode fixing assembly.

19. The battery pack according to claim 2, characterized in that: The beam includes a side beam and a middle beam, the side beam is arranged along the edge of the bottom plate and encloses an installation space, the middle beam extends along the stacking direction of the soft-pack battery cells and divides the installation space into a first installation space and a second installation space, The battery cell stack comprises a first battery cell stack installed in the first installation space and a second battery cell stack installed in the second installation space, wherein the first battery cell stack is provided with a first electrode lead-out portion at an end close to the second battery cell stack, and the second battery cell stack is provided with a second electrode lead-out portion at an end close to the first battery cell stack. The first electrode lead-out portion and the second electrode lead-out portion have opposite positive and negative polarities and are arranged corresponding to each other across the middle beam. The busbar support is directly fixed to the middle beam or fixed to the middle beam through a connecting structure. The busbar includes a first busbar at least partially located in the first installation space and a second busbar at least partially located in the second installation space, and the busbar support supports the first busbar and the second busbar electrically connected to each other. The first electrode lead-out portion is fixed to the first bus bar, and the second electrode lead-out portion is fixed to the second bus bar.

20. The battery pack according to claim 19, characterized in that: The first busbar includes a plate-shaped body and an output connection portion formed by bending and extending the end of the plate-shaped body, and the second busbar includes a plate-shaped body and an output connection portion formed by bending and extending the end of the plate-shaped body. The busbar support supports the output connection portion of the first busbar and the output connection portion of the second busbar which are separated from each other. The busbar further includes a transition busbar connected between the output connection portion of the first busbar and the output connection portion of the second busbar. A bolt passes through the output connection portion of the transition busbar and the first busbar, and is connected with a nut member embedded in the busbar bracket. Another bolt passes through the output connection parts of the transition busbar and the second busbar, and is connected with another nut member embedded in the busbar bracket. The first electrode lead-out portion is fixed to the plate-shaped body of the first bus bar, and the second electrode lead-out portion is fixed to the plate-shaped body of the second bus bar.

21. The battery pack according to claim 19, characterized in that: The first busbar includes a plate-shaped body and an output connection portion formed by bending and extending the end of the plate-shaped body, and the second busbar includes a plate-shaped body and an output connection portion formed by bending and extending the end of the plate-shaped body. The busbar support supports the output connection portion of the first busbar and the output connection portion of the second busbar which are stacked on each other in a vertical direction, The bolt passes through the output connection portion of the first busbar and the output connection portion of the second busbar, and is connected with the nut member embedded in the busbar bracket. The first electrode lead-out portion is fixed to the plate-shaped body of the first bus bar, and the second electrode lead-out portion is fixed to the plate-shaped body of the second bus bar.

22. The battery pack according to claim 2, characterized in that: The beam includes a side beam and a middle beam, the side beam is arranged along the edge of the bottom plate and encloses an installation space, the middle beam extends along the stacking direction of the soft-pack battery cells and divides the installation space into a first installation space and a second installation space, The battery cell stack includes a first battery cell stack installed in the first installation space and a second battery cell stack installed in the second installation space. The first cell stack is provided with a first positive lead-out portion and a first negative lead-out portion at an end portion close to the second cell stack, and the first positive lead-out portion and the first negative lead-out portion are placed at two ends of the cell stack in the stacking direction of the soft-pack cells. The second battery cell stack is provided with a second positive lead-out portion and a second negative lead-out portion at an end portion close to the first battery cell stack, the second positive lead-out portion and the second negative lead-out portion are placed at two ends of the battery cell stack in the stacking direction of the soft-pack battery cells, and the positions of the first positive lead-out portion and the second negative lead-out portion correspond to each other, and the positions of the first negative lead-out portion and the second positive lead-out portion correspond to each other, The end of the first battery cell stack away from the second battery cell stack is provided with a third positive electrode lead-out portion and a third negative electrode lead-out portion, and the third positive electrode lead-out portion and the third negative electrode lead-out portion are adjacent to each other in the stacking direction of the soft-pack battery cells. The electrode fixing assembly includes a first electrode fixing assembly, a second electrode fixing assembly and a third electrode fixing assembly, The busbar support of the first electrode fixing assembly is directly fixed to the middle beam or fixed to the middle beam through a connecting structure, and the first positive electrode lead-out portion and the second negative electrode lead-out portion are respectively fixed to two mutually electrically connected busbars of the first electrode fixing assembly, The busbar support of the second electrode fixing assembly is directly fixed to the middle beam or fixed to the middle beam through a connecting structure, and the first negative electrode lead-out portion and the second positive electrode lead-out portion are respectively fixed to two mutually electrically connected busbars of the second electrode fixing assembly, The busbar bracket of the third electrode fixing assembly is directly fixed to the side beam or fixed to the side beam through a connecting structure, and the third positive electrode lead-out portion and the third negative electrode lead-out portion are respectively fixed to two busbars of the third electrode fixing assembly that are separated from each other.

23. The battery pack according to claim 2, characterized in that: The beam includes a side beam and a middle beam, the side beam is arranged along the edge of the bottom plate and encloses an installation space, the middle beam extends along the stacking direction of the soft-pack battery cells and divides the installation space into a first installation space and a second installation space, The battery cell stack includes a first battery cell stack installed in the first installation space and a second battery cell stack installed in the second installation space. The first cell stack is provided with a first positive lead-out portion and a first negative lead-out portion at an end away from the second cell stack, and the first positive lead-out portion and the first negative lead-out portion are placed at two ends of the cell stack in the stacking direction of the soft-pack cells. The second cell stack is provided with a second positive lead-out portion and a second negative lead-out portion at an end portion close to the first cell stack, and the second positive lead-out portion and the second negative lead-out portion are placed at two ends of the cell stack in the stacking direction of the soft-pack cells. The end of the first battery cell stack close to the second battery cell stack is provided with a third positive electrode lead-out portion and a third negative electrode lead-out portion, and the third positive electrode lead-out portion and the third negative electrode lead-out portion are adjacent to each other in the stacking direction of the soft-pack battery cells. The electrode fixing assembly includes a first electrode fixing assembly, a second electrode fixing assembly, a third electrode fixing assembly, a fourth electrode fixing assembly and a fifth electrode fixing assembly, The busbar bracket of the first electrode fixing assembly is directly fixed to the side beam or fixed to the side beam through a connecting structure, and the first positive electrode lead-out portion is fixed to the busbar of the first electrode fixing assembly. The busbar bracket of the second electrode fixing assembly is directly fixed to the side beam or fixed to the side beam through a connecting structure, and the first negative electrode lead-out portion is fixed to the busbar of the second electrode fixing assembly. The busbar support of the third electrode fixing assembly is directly fixed to the middle beam or fixed to the middle beam through a connecting structure, and the second positive electrode lead-out portion is fixed to the busbar of the third electrode fixing assembly. The busbar support of the fourth electrode fixing assembly is directly fixed to the middle beam or fixed to the middle beam through a connecting structure, and the second negative electrode lead-out portion is fixed to the busbar of the fourth electrode fixing assembly. The busbar bracket of the fifth electrode fixing assembly is directly fixed to the middle beam or fixed to the middle beam through a connecting structure, and the third positive electrode lead-out portion and the third negative electrode lead-out portion are respectively fixed to two mutually separated busbars of the fifth electrode fixing assembly.

24. The battery pack according to claim 3, characterized in that: An elastic member is disposed between the second busbar support portion and the beam.

25. An electric vehicle, characterized in that: A battery pack according to any one of claims 1 to 24 is integrated.

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