Battery pack and electric vehicle

Abstract

To utilize a space in a box body sufficiently to improve a volume utilization ratio and energy density.SOLUTION: A battery pack is provided including: a box body 1; one or more cell laminates 3, 4; and an electrode fixing component 100. The cell laminate is formed by laminating a plurality of pouch battery cells in a thickness direction of the pouch battery cells. The electrode fixing component includes: bus bars; and a bus bar bracket supporting the bus bars. The bus bar bracket is engaged and connected with a fixing structure of the box body. The bus bar is engaged and connected with an electrode of the cell laminate.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and more specifically, to a battery pack and an electric vehicle equipped with the battery pack.

Background Art

[0002] The operating voltage of a single secondary battery is about 2.5V to 4.5V. In an electric vehicle or an energy storage system that requires a large capacity and a high voltage output, usually, after a plurality of cells are connected in series and / or in parallel to form a battery module, the battery modules are connected in series and / or in parallel to form a battery pack, and further, the battery pack needs to be used as an energy system or an energy storage system that supplies energy to an electric vehicle. The number, shape of the battery modules used to construct the battery pack, and the number, shape, etc. of the cells used to form the battery modules can be flexibly changed according to actual requirements.

[0003] In the field of power batteries used in electric vehicles, in order to improve the driving range and charging speed of electric vehicles during full charge, it is necessary to further enhance the energy density and cooling performance of the battery pack. As one method of improving the energy density, a CTP (cell to pack) type battery pack directly mounts cells on the battery pack by omitting the step of connecting cells in series and / or in parallel to form a battery module, thereby saving the structure and electrical connection members required for forming the battery module and increasing the space for the cells themselves.

[0004] Currently, general cells are classified into cylindrical cells, prismatic cells, pouch-type battery cells, etc. based on differences in structure. The CTP type battery pack using prismatic cells has already been widely publicized and widely used. Due to the disadvantages that pouch-type battery cells are vulnerable to external impacts and have poor assemblability, a series of problems may still be faced in the process of mounting them as a CTP type battery pack.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention solves at least one of a plurality of problems faced in mounting a pouch-type battery cell in an existing technology on a pouch-type battery CTP battery pack.

Means for Solving the Problems

[0006] The present invention provides a battery pack including a box body, a cell stack, a thermally conductive structural adhesive, and an electrode fixing component. The box body includes a bottom plate. The cell stack is located inside the box body and is formed by stacking a plurality of pouch-type battery cells. An electrode lead-out portion is provided at an end portion of the cell stack in the longitudinal direction of the pouch-type battery cell. The thermally conductive structural adhesive is directly adhered between the cell stack and the bottom plate. The electrode fixing component is located at an end portion of the cell stack where the electrode lead-out portion is formed, and includes a bus bar and a bus bar bracket that supports the bus bar. The bus bar bracket is engaged and connected to the box body, and the electrode lead-out portion is fixed to the bus bar.

[0007] In a battery pack of an optional technical solution, the box body includes a beam fixed to the bottom plate, the bus bar bracket includes a nut member pre-embedded therein, the bus bar bracket is directly fixed to the beam or fixed to the beam via a connection structure, and the bus bar is connected to the bus bar bracket in a form corresponding to the installation of the nut member. Among them, the form in which the bus bar corresponds to the installation of the nut member refers to a form in which the bus bar is connected to the bus bar bracket using the nut member. More specifically, it refers to a form in which a through hole used for connection on the bus bar corresponds to a screw hole of the nut member.

[0008] In a battery pack with selectable technical solutions, the bus bar includes a plate-shaped body and an output connection portion. The output connection portion is formed by bending and extending the end of the plate-shaped body. The bus bar bracket includes a first bus bar support portion and a second bus bar support portion. The second bus bar support portion includes a nut member pre-embedded therein and is directly fixed to the beam or fixed to the beam via a connection structure. The plate-shaped body is fixedly connected in a form that is in surface contact with the first bus bar support portion. The output connection portion is fixedly connected to the second bus bar support portion in a form that overlaps and connects with the nut member. Among them, the plate-shaped body being in surface contact with the first bus bar support portion means that the support surface of the plate-shaped body and the first bus bar support portion are mutually bonded.

[0009] In a battery pack with selectable technical solutions, a long hole is provided in the output connection portion. The long hole has a length extending along the stacking direction of the pouch-type battery cells. The output connection portion is fixedly connected to the second bus bar support portion using a bolt that sequentially penetrates the long hole and the nut member.

[0010] In a battery pack with selectable technical solutions, the first bus bar support portion is provided with a shielding plate. The shielding plate is located between the cell stack and the bus bar. The plate-shaped body is bonded to the surface of the shielding plate parallel to the stacking direction of the pouch-type battery cells.

[0011] In a battery pack with selectable technical solutions, the second bus bar support portion is provided with a buckle that engages with the beam or the connection structure.

[0012] In a battery pack with selectable technical solutions, the top of the nut member is higher than the upper surface close to the output connection portion of the second bus bar support 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 bar support portion satisfies 0.3 mm ≤ D ≤ 0.5 mm.

[0013] In a battery pack with selectable technical solutions, the thickness H of the wall at the position corresponding to the nut member of the second bus bar support portion satisfies 1.2 mm ≤ H ≤ 1.8 mm.

[0014] In a battery pack with selectable technical solutions, a foaming adhesive is filled between the cell stack and the beam, and the foaming adhesive may wrap at least a part of the electrode lead-out part and at least a part of the bus bar.

[0015] In a battery pack with selectable technical solutions, there are two bus bars. A first partition part for separating the plate-shaped bodies of the two bus bars is provided in the first bus bar support part, and a second partition part for separating the output connection parts of the two bus bars is provided in the second bus bar support part.

[0016] In a battery pack with selectable technical solutions, two through holes for passing the electrode lead-out part are provided in the first bus bar support part, and the two through holes are arranged separately on two sides of the first partition part.

[0017] In a battery pack with selectable technical solutions, a positioning block for being clamped by a tool is provided on the bus bar bracket.

[0018] In a battery pack with selectable technical solutions, a positioning hole for inserting a tool is provided at the top of the bus bar bracket.

[0019] In a battery pack with selectable technical solutions, a guide strip is provided on one of the first bus bar support part and the second bus bar support part, and a slot for the guide strip to be engaged and inserted is provided on the other.

[0020] In a battery pack with selectable technical solutions, a through hole for passing the electrode lead-out part is provided in the first bus bar support part.

[0021] In a battery pack with selectable technical solutions, the first bus bar support part and the second bus bar support part are integrally formed.

[0022] In a battery pack with selectable technical solutions, two electrode lead-out parts are provided at one end of a pouch-type battery cell of a cell stack in the longitudinal direction. The positive and negative polarities of the two electrode lead-out parts are opposite, and they are adjacent to each other in the stacking direction of the pouch-type battery cell. The two electrode lead-out parts respectively penetrate through two through holes and are fixed to two bus bars.

[0023] In a battery pack with selectable technical solutions, two electrode lead-out parts are provided at one end of a pouch-type battery cell of a cell stack in the longitudinal direction. The positive and negative polarities of the two electrode lead-out parts are opposite, and they are separately arranged at two ends in the stacking direction of the pouch-type battery cell of the cell stack. There are two electrode fixing components. One electrode lead-out part is fixed to the bus bar of one electrode fixing component, and the other electrode lead-out part is fixed to the bus bar of the other electrode fixing component.

[0024] In a battery pack with selectable technical solutions, the beam includes a side beam and a middle beam. The side beam provided along the edge of the bottom plate surrounds to form a mounting space, and the middle beam extends along the stacking direction of the pouch-type battery cell to partition the mounting space into a first mounting space and a second mounting space. The cell stack includes a first cell stack mounted in the first mounting space and a second cell stack mounted in the second mounting space. A first electrode lead-out part is provided at the end of the first cell stack close to the second cell stack, and a second electrode lead-out part is provided at the end of the second cell stack close to the first cell stack. The positive and negative polarities of the first electrode lead-out part and the second electrode lead-out part are opposite, and they are provided corresponding to each other with the middle beam in between. The bus bar bracket is directly fixed to the middle beam or fixed to the middle beam through a connection structure. The bus bar includes a first bus bar at least partially located in the first mounting space and a second bus bar at least partially located in the second mounting space. The bus bar bracket supports the first bus bar and the second bus bar that are electrically connected to each other. The first electrode lead-out part is fixed to the first bus bar, and the second electrode lead-out part is fixed to the second bus bar.

[0025] In a battery pack with selectable technical solutions, the first bus bar includes a plate-shaped body and an output connection portion formed by bending and extending an end portion of the plate-shaped body. The second bus bar includes a plate-shaped body and an output connection portion formed by bending and extending an end portion of the plate-shaped body. The bus bar bracket supports the output connection portions of the first bus bar and the second bus bar that are spaced apart from each other. The bus bar further includes a transition bus bar, and the transition bus bar is connected between the output connection portion of the first bus bar and the output connection portion of the second bus bar. One bolt penetrates the transition bus bar and the output connection portion of the first bus bar and engages with one nut member pre-assembled inside the bus bar bracket for connection. Another bolt penetrates the transition bus bar and the output connection portion of the second bus bar and engages with another nut member pre-assembled inside the bus bar bracket for connection. 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.

[0026] In a battery pack with selectable technical solutions, the first bus bar includes a plate-shaped body and an output connection portion formed by bending and extending an end portion of the plate-shaped body. The second bus bar includes a plate-shaped body and an output connection portion formed by bending and extending an end portion of the plate-shaped body. The bus bar bracket supports the output connection portions of the first bus bar and the second bus bar that overlap and are connected to each other in the vertical direction. A bolt penetrates the output connection portions of the first bus bar and the second bus bar and engages with a nut member pre-assembled inside the bus bar bracket for connection. 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.

[0027] In a selectable technical solution battery pack, the beam includes a side beam and a middle beam. The side beam provided along the edge of the bottom plate surrounds to form an installation space, and the middle beam extends along the stacking direction of the pouch-type battery cells to partition the installation space into a first installation space and a second installation space. The cell stack includes a first cell stack mounted in the first installation space and a second cell stack mounted in the second installation space. A first positive electrode lead-out portion and a first negative electrode lead-out portion are provided at an end of the first cell stack close to the second cell stack. The first positive electrode lead-out portion and the first negative electrode lead-out portion are separately arranged at two ends in the stacking direction of the pouch-type battery cells of the cell stack. A second positive electrode lead-out portion and a second negative electrode lead-out portion are provided at an end of the second cell stack close to the first cell stack. The second positive electrode lead-out portion and the second negative electrode lead-out portion are separately arranged at two ends in the stacking direction of the pouch-type battery cells of the cell stack, and the positions of the first positive electrode lead-out portion and the second negative electrode lead-out portion correspond to each other, and the positions of the first negative electrode lead-out portion and the second positive electrode lead-out portion correspond to each other. A third positive electrode lead-out portion and a third negative electrode lead-out portion are provided at an end of the first cell stack far from the second 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 pouch-type battery cells.

[0028] The electrode fixing components include a first electrode fixing component, a second electrode fixing component, and a third electrode fixing component. The bus bar bracket of the first electrode fixing component is directly fixed to the middle beam or fixed to the middle beam through a connection structure. The first positive electrode lead-out portion and the second negative electrode lead-out portion are respectively fixed to two electrically connected bus bars of the first electrode fixing component. The bus bar bracket of the second electrode fixing component is directly fixed to the middle beam or fixed to the middle beam through a connection structure. The first negative electrode lead-out portion and the second positive electrode lead-out portion are respectively fixed to two electrically connected bus bars of the second electrode fixing component. The bus bar bracket of the third electrode fixing component is directly fixed to the side beam or fixed to the side beam through a connection structure. The third positive electrode lead-out portion and the third negative electrode lead-out portion are respectively fixed to two spaced-apart bus bars of the third electrode fixing component.

[0029] In a selectable technical solution battery pack, the beam includes a side beam and a middle beam. The side beam provided along the edge of the bottom plate surrounds to form a mounting space, and the middle beam extends along the stacking direction of the pouch-type battery cells to partition the mounting space into a first mounting space and a second mounting space. The cell stack includes a first cell stack mounted in the first mounting space and a second cell stack mounted in the second mounting space. A first positive electrode lead-out portion and a first negative electrode lead-out portion are provided at an end of the first cell stack far from the second cell stack, and the first positive electrode lead-out portion and the first negative electrode lead-out portion are separately arranged at two ends in the stacking direction of the pouch-type battery cells of the cell stack. A second positive electrode lead-out portion and a second negative electrode lead-out portion are provided at an end of the second cell stack close to the first cell stack, and the second positive electrode lead-out portion and the second negative electrode lead-out portion are separately arranged at two ends in the stacking direction of the pouch-type battery cells of the cell stack. A third positive electrode lead-out portion and a third negative electrode lead-out portion are provided at an end of the first cell stack close to the second 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 pouch-type battery cells.

[0030] The electrode fixing component includes a first electrode fixing component, a second electrode fixing component, a third electrode fixing component, a fourth electrode fixing component, and a fifth electrode fixing component. The bus bar bracket of the first electrode fixing component is directly fixed to the side beam or fixed to the side beam through a connection structure, and the first positive electrode lead-out part is fixed to the bus bar of the first electrode fixing component. The bus bar bracket of the second electrode fixing component is directly fixed to the side beam or fixed to the side beam through a connection structure, and the first negative electrode lead-out part is fixed to the bus bar of the second electrode fixing component. The bus bar bracket of the third electrode fixing component is directly fixed to the middle beam or fixed to the middle beam through a connection structure, and the second positive electrode lead-out part is fixed to the bus bar of the third electrode fixing component. The bus bar bracket of the fourth electrode fixing component is directly fixed to the middle beam or fixed to the middle beam through a connection structure, and the second negative electrode lead-out part is fixed to the bus bar of the fourth electrode fixing component. The bus bar bracket of the fifth electrode fixing component is directly fixed to the middle beam or fixed to the middle beam through a connection structure, and the third positive electrode lead-out part and the third negative electrode lead-out part are respectively fixed to two mutually separated bus bars of the fifth electrode fixing component.

[0031] In the battery pack of the selectable technical solution, an elastic member is provided between the second bus bar support part and the beam.

[0032] The present invention further provides an electric vehicle, which is equipped with the battery pack of any one of the above selectable technical solutions.

Effect of the Invention

[0033] By providing the electrode fixing component, the electrodes of the cell stack can be fixed without using the end plate component. Thereby, by realizing directly loading the cell stack into the box body, the space in the box body can be fully utilized to improve the volume utilization rate and the energy density.

Brief Description of the Drawings

[0034]

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Mode for Carrying Out the Invention

[0035] Hereinafter, the operating principle, features, advantages, etc. of the battery pack of the present disclosure will be described with examples, but it should be understood that all the descriptions are provided only for illustrative purposes. Therefore, it should not be understood as a limitation to the present disclosure.

[0036] Also, with respect to any single technical feature described or implied in the embodiments referred to in this specification, or any single technical feature illustrated or implied in each drawing, the present disclosure enables any combination or deletion between these technical features (or their equivalents) without technical obstacles, thereby obtaining further other embodiments of the present disclosure not directly mentioned in this specification.

[0037] <Terms>

[0038] In this specification, the X-axis direction refers to the longitudinal direction of a single pouch-type battery cell, the Y-direction refers to the stacking direction of a single pouch-type battery cell, and the Z-direction refers to the direction perpendicular to the plane defined by the X-axis and the Y-axis.

[0039] In this specification, "up" refers to the direction far from the bottom plate of the lower housing in the Z-axis direction, and "down" refers to the direction close to the bottom plate of the lower housing in the Z-axis direction.

[0040] <Summary>

[0041] Referring generally to the drawings, based on exemplary embodiments, a pouch-type battery CTP (Cell to Pack) battery pack, a cell stack, and components used to fix the output electrodes of the cell stack are shown. By providing an electrode fixing component, the electrodes of the cell stack can be fixed without using an end plate component. This realizes directly loading the cell stack into the box body, making full use of the space inside the box body to improve the volume utilization rate.

[0042] <Cell stack distribution>

[0043] FIG. 1 is a stack distribution diagram of a pouch-type battery CTP battery pack provided in some embodiments of the present invention.

[0044] Referring to FIG. 1, in some embodiments of the present invention, the pouch-type battery CTP battery pack includes a rectangular box body 1 and a rectangular cell stack. The internal space of the box body 1 can arrange two cell stacks (3, 4) side by side.

[0045] The two cell stacks (3, 4) are, namely, the first cell stack 3 and the second cell stack 4. At two ends of the first cell stack 3 adjacent to the second cell stack 4, a first output positive electrode 301 and a first output negative electrode 302 are respectively provided. Correspondingly, at two ends of the second cell stack 4 adjacent to the first cell stack 3, a second output positive electrode 401 and a second output negative electrode 402 are respectively provided. Among them, the positions of the first output positive electrode 301 and the second output negative electrode 402 correspond, and the positions of the first output negative electrode 302 and the second output positive electrode 401 correspond, thereby shortening the wiring length and facilitating the series electrical connection between the two cell stacks (3, 4).

[0046] In addition, at an end of the first cell stack 3 far from the second cell stack 4, a third output positive electrode 303 and a third output negative electrode 304 adjacent to each other are further provided. 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 for series electrical connection inside the two 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 pouch-type battery CTP battery pack. In some embodiments, the third output positive electrode 303 and the third output negative electrode 304 are electrically connected to a battery pack disconnect unit (BDU), and thereby power is supplied to the entire vehicle by the battery pack disconnect unit.

[0047] The output electrodes provided by the above distribution and electrical connection method, namely, the third output positive electrode 303 and the third output negative electrode 304, are adjacent to each other. Depending on the situation, when it is necessary to separate the output electrodes of the entire pouch-type battery CTP battery pack from each other, the first cell stack 3 may be rotated 180° with respect to FIG. 1 and arranged in the box 1, thereby obtaining the assembly structure shown in FIG. 2.

[0048] Referring to FIG. 2, the third output positive electrode 303 and the third output negative electrode 304 are rotated to positions adjacent to the second cell stack 4. The third output positive electrode 303 and the second output negative electrode 402 are electrically connected via the adapter bus bar 6, and the third output negative electrode 304 and the second output positive electrode 401 are electrically connected via another adapter bus bar 6, thereby realizing a high-voltage electrical connection between the first cell stack 3 and the second cell stack 4. The first output positive electrode 301 and the first output negative electrode 302 may be used as the output electrodes of the pouch-type battery CTP battery pack as a whole. By using the first cell stack 3 and the adapter bus bar 6 of the above-described electrode distribution in combination, different requirements for the output electrode positions can be satisfied by flexibly adjusting the mounting angle of the first cell stack 3.

[0049] As described above, the distribution method and the electrical connection method of the first cell stack 3 and the second cell stack 4 in some embodiments of the present invention have been exemplified. It should be understood that the above description is merely illustrative and should not be construed as a limitation on the distribution method and the electrical connection method. In other embodiments of the present invention, the first cell stack 3 and the second cell stack 4 may be mounted on a single row of cell stacks, and the installation positions of the output electrodes of each cell stack may also be flexibly adjusted according to actual requirements.

[0050] FIG. 3 is an exploded view of a pouch-type battery CTP battery pack adopting the stack distribution corresponding to FIG. 1.

[0051] Referring to FIG. 3, the rectangular box body 1 includes a lower housing 12 and an upper lid 13. The lower housing 12 includes a rectangular lower housing bottom plate 121 and four side beams 122, and the four side beams 122 are respectively fixed to the four sides of the rectangular lower housing bottom plate 121. A chamber used to accommodate the cell stack is formed surrounded by the four side beams 122, the lower housing bottom plate 121, and the upper lid 13. In addition to the four side beams 122, the box body 1 further includes a box body middle beam 123 provided at the center in the longitudinal direction of the box body 1. The box body middle beam 123 partitions the chamber into a first chamber 21 and a second chamber 22. The first chamber 21 is used to accommodate the first cell stack 3, and the second chamber 22 is used to accommodate the second cell stack 4.

[0052] Between the bottom of the cell stack and the lower housing bottom plate 121, they are directly adhesively fixed by a thermally conductive structural adhesive. In order to stabilize the cell stack and enhance the strength of the entire battery pack, a foaming adhesive 5 is further filled between the cell stack and the side beam 122 or the box body middle beam 123. A structural adhesive or an elastomeric component (not shown) is provided at the top of the cell stack to fill the gap between the cell stack and the upper lid 13. By using the thermally conductive structural adhesive between the bottom of the cell stack and the lower housing bottom plate 121, the foaming adhesive 5, and the structural adhesive or elastomeric component provided at the top of the cell stack, stable and buffering support for the cell stack can be formed from each direction of the four sides. In some embodiments, the elastomeric component is formed by compounding a refractory material such as foam and mica, and a double-sided tape or a hot melt adhesive is provided between the elastomeric component and the cell stack.

[0053] 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 component is provided inside the central portion of the short side beam adjacent to the first cell stack 3, and both the third output positive electrode 303 and the third output negative electrode 304 are fixedly connected to the electrode fixing component.

[0054] An electrode fixing component is provided on the box body middle beam 123. The bus bar connected to the first output positive electrode 301 and the bus bar connected to the second output negative electrode 402 are electrically connected and both are fixed to one of the electrode fixing components. The bus bar connected to the first output negative electrode 302 and the bus bar connected to the second output positive electrode 401 are electrically connected and both are fixed to the other of the electrode fixing components. In this way, the electrical connection between the first cell stack 3 and the second cell stack 4 is realized by the two electrode fixing components.

[0055] There are multiple types of specific embodiments of the electrode fixing component, and these embodiments will be described in detail below.

[0056] <Cell stack structure>

[0057] Subsequently, referring to FIG. 3, in the present embodiment, the cell stack is formed by stacking a plurality of pouch-type battery cell units 7. The stacking direction, that is, the Y-axis direction, is the thickness direction of the pouch-type battery cell unit 7 and is also the width direction of the box body 1. The longitudinal direction of the pouch-type battery cell unit 7, that is, the X-axis direction, is also the longitudinal direction of the box body 1. The top and bottom of each pouch-type battery cell unit 7 are insulated and protected by adopting a method of sticking an insulating tape (not shown) on the entire surface.

[0058] <Electrode fixing component 100>

[0059] The first embodiment

[0060] The electrode fixing component 100 in the present embodiment is used to fix the third output positive electrode 303 and the third output negative electrode 304 shown in FIG. 1.

[0061] Figure 4 is a partial view before attaching the cell stack to the box. Referring to Figure 4, the electrode fixing component 100 includes a bus bar bracket 8, a bus bar 9, and a support base 10. Among them, the bus bar bracket 8 includes a first bus bar support portion 81 and a second bus bar support portion 82, and the second bus bar support portion 82 includes a pre-embedded nut 821 provided inside thereof.

[0062] Figure 5 is a diagram showing the connection between the support base 10 and the box 1, and Figure 6 is a partially enlarged view of position C in Figure 5. Referring to Figures 5 and 6, the support base 10 is rectangular and is provided on the inner wall surface of the side beam 122 of the box 1. A locking hole 101 is provided on the outer peripheral wall, and two plate portions 102 extending in a plane defined by the X-axis and the Z-axis are provided at intervals inside. As shown in Figure 7, the support base 10 and the second bus bar support portion 82 may be connected together by engagement or the like. Among them, the support base 10 has a metal structure and may be integrally formed on the side beam 122 or welded and fixed to the side beam 122.

[0063] Figure 8 is a partially enlarged view of Figure 5, showing the state in which the first bus bar support portion 81 and the bus bar 9 are connected together.

[0064] The first bus bar support portion 81 includes a shielding plate 810. The shielding plate 810 includes back plates 811, 812 extending in the Z-axis direction, and side plates 813 formed by bending both sides of the back plates 811, 812. The back plates are composed of a first back plate 811 and a second back plate 812 whose upper edges are connected together and arranged side by side, whereby the entire back plate presents a comb shape. The two bus bars 9 are respectively connected to the first back plate 811 and the second back plate 812.

[0065] The bus bar 9 includes a main body portion 91 extending in the Z-axis direction, and a bent portion 92 formed by bending forward from the upper end of the main body portion 91. An opening 921 is provided in the bent portion 92.

[0066] A fixing hole 911 is provided in the main body portion 91, and the bus bar 9 is fixedly connected to the first bus bar support portion 81 using the fixing hole 911.

[0067] The opening 921 of the bent portion 92 may be a circular hole or a long hole. It is preferable that the opening 921 is a long hole extending along the Y-axis direction. When the opening 921 is a long hole, even if warping occurs in the Y-axis direction in the cell laminate, the screw connection by the long hole can tightly fasten the bus bar 9 and absorb manufacturing tolerances.

[0068] Through holes 814 for passing electrode tabs (not shown) of the third output positive electrode 303 and the third output negative electrode 304 are provided in the first back plate 811 and the second back plate 812 of the first bus bar support portion 81. By making the length of the through hole 814 extending in the Z-axis direction larger than the width of the electrode tab in the Z-axis direction, it is ensured that the electrode tab can penetrate the through hole along the X-axis direction and be roll-bent in the Y-axis direction to be closely welded to the bus bar 9.

[0069] A rib 815 is provided between the through holes 814 of the first back plate 811 and the second back plate 812 to avoid a short circuit due to the overlap of the cell tabs of the third output positive electrode 303 and the third output negative electrode 304. The height of the rib 815 in the Z-axis direction is preferably 2 to 4 mm in order to more preferably avoid the occurrence of a short circuit and improve the reliability of the battery.

[0070] FIG. 9 is a partial view after the cell laminate is attached to the box body 1. As shown in FIG. 9, the bus bar 9 is overlapped and fixed on the second bus bar support portion 82 in a form in which its opening 921 overlaps and is connected to the nut 821.

[0071] FIG. 10 is a perspective view in which the bus bar 9, the second bus bar support portion 82, and the support base 10 are connected. FIG. 11 is a top view of the structure shown in FIG. 10. FIG. 12 is a cross-sectional view taken along line B-B of the structure shown in FIG. 11. Referring to FIGS. 10 to 12, the support base 10 is fixed on the inner surface of the side beam 122 of the box body 1. Engagement holes 101 are provided in the peripheral wall of the support base 10, and buckles 84 that engage with the engagement holes 101 are provided in the second bus bar support portion 82. By the engagement between the buckle 84 and the engagement hole 101 and the supporting action of the plate portion 102 on the second bus bar support portion 82, the second bus bar support portion 82 is fixedly connected to the upper end of the support base 10. The two bus bars 9 are connected by overlapping the upper surface of the second bus bar support portion 82 and contact the nut 821. The bolt 83 passes through the opening 921 of the bus bar 9 and is fastened to the nut 821. The central portion of the second bus bar support portion 82 is provided with a partition portion 822 in the form of a protrusion extending upward, and the partition portion 822 separates the two bus bars 9.

[0072] To ensure that the bus bar 9 can first overlap and connect with the nut 821, it is preferable that the nut 821 protrudes 0.3 to 0.5 mm from the upper surface of the second bus bar 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 bar support portion 82 is 0.3 to 0.5 mm.

[0073] The thickness of the plastic wall at the position corresponding to the nut 821 of the second bus bar support portion 82 is preferably 1.2 to 1.8 mm.

[0074] In this embodiment, first, the second bus bar support portion 82 is fixed to the support base 10, and the cell tabs of the third output positive electrode 303 and the third output negative electrode 304 are connected to the bus bar 9 fixed to the first bus bar support portion 81. Then, the entire cell stack and the bus bar 9 fixed to the first bus bar support portion 81 are installed in the box body 1, and the bus bar 9 is overlapped with the second bus bar support portion 82 and fixed together.

[0075] In the above description, the electrode fixing component 100 of the present embodiment has been described by taking as an example its use for fixing the third output positive electrode 303 and the third output negative electrode 304 shown in FIG. 1. However, the present invention is not limited thereto. As long as the output electrodes can be fixed using the electrode fixing component 100 described above, the specific positions of the output electrodes in the box body 1 are not particularly limited. For example, in some embodiments, the third output positive electrode 303 and the third output negative electrode 304 shown in FIG. 2 may be fixed using the electrode fixing component 100 provided in the present embodiment, and it is only necessary for the support base 10 to move from the position of the side beam 122 to the position of the box body middle beam 123. Further, for example, in some embodiments, the third output positive electrode 303 and the third output negative electrode 304 shown in FIG. 2 may be fixed using the electrode fixing component 100 provided in the present embodiment. Considering that the output electrodes are located at the central portion of the box body 1, it may be selected to omit the use of the support base 10 mentioned above, or the support base 10 may be mounted on the box body middle beam 123 and used as a part of the box body middle beam 123.

[0076] Second Embodiment

[0077] The electrode fixing component 200 in the present embodiment may be used for fixing the third output positive electrode 303 and the third output negative electrode 304 shown in FIG. 2.

[0078] FIG. 13 is an isometric projection view of the electrode fixing component 200 in the present embodiment. FIG. 14 is a front view of the structure shown in FIG. 13. FIG. 15 is a sectional view in the Z direction of the structure shown in FIG. 14. FIG. 16 is a partially enlarged view of the cell laminate.

[0079] Referring to FIGS. 13 to 16, the electrode fixing component 200 includes a bus bar bracket 8 and a bus bar 9. Among them, the bus bar bracket 8 includes a first bus bar support portion 81 and a second bus bar support portion 82. The second bus bar support portion 82 includes a pre-embedded nut 821 provided inside thereof. Among them, the first bus bar support portion 81 and the second bus bar support portion 82 are integrated as mounting components and injection-molded, and the bus bar 9 is fixed by being incorporated into the bus bar bracket 8.

[0080] The second bus bar support portion 82 includes two side plates 203 provided opposite to each other in the Y-axis direction, two spaced-back plates 204 formed by bending the rear ends of the two side plates 203 to face inward, and an upper plate 205 and a lower plate 206 provided opposite to each other in the Z-axis direction. The nut 821 is provided in the space between the upper plate 205 and the lower plate 206. The nut 821 and the second bus bar support portion 82 are integrated as mounting components and injection-molded. The central portion of the upper plate 205 is connected to the back plate 501 of the first bus bar support portion 81. By integrally injection-molding the first bus bar support portion 81 and the second bus bar support portion 82 as mounting components, accurate alignment between the bus bar 9 and the nut 821 can be ensured. Also, before attaching the cell stack to the box body 1, first fastening the bus bar 9 and the nut 821 with bolts or the like can avoid the situation where the output electrode gap is misaligned during the assembly process.

[0081] In this embodiment, the structures of the first bus bar support portion 81 and the bus bar 9 are similar to those described in the above Embodiment 1. Referring to FIGS. 14 and 15, two through holes 502 through which the cell tabs of the third output positive electrode 303 and the third output negative electrode 304 penetrate are provided in the back plate 501 of the first bus bar support portion 81. To ensure that the cell tabs can penetrate through the through holes 502, the length of the through holes 502 extending in the Z-axis direction is greater than the width of the cell tabs of the third output positive electrode 303 and the third output negative electrode 304 in the Z-axis direction. Further, a rib 503 is provided between the two through holes 502 to avoid a short circuit due to overlap between the cell tabs of the third output positive electrode 303 and the third output negative electrode 304. To more appropriately avoid the occurrence of a short circuit and improve the reliability of the battery, the height of the rib 503 in the Z-axis direction is preferably 2 to 4 mm.

[0082] Referring to FIG. 13, the bus bar 9 is fixed to the first bus bar support portion 81 by hot riveting or buckling, and the bent portions 92 of the two bus bars 9 respectively overlap and are connected to the upper surface of the upper plate 205 of the second bus bar support portion 82. A partition portion 2051 in the form of a protrusion is formed in the central portion of the upper plate 205 to separate the two bus bars 9.

[0083] Buckles 2061 are respectively provided at the lower ends of the two side plates 203 of the second bus bar support portion 82, and a connection structure engaging with the buckles 2061 is provided on the box body 1. The electrode fixing component 200 is fixedly connected to the box body middle beam 123 using the buckles 2061.

[0084] To ensure that the bus bar 9 can first overlap and be connected to the nut 821, the nut 821 preferably protrudes 0.3 to 0.5 mm from the upper surface of the upper plate 205 of the second bus bar 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 preferably 0.3 to 0.5 mm.

[0085] The thickness of the plastic wall at the position corresponding to the nut 821 of the second bus bar support portion 82 is preferably 1.2 to 1.8 mm.

[0086] The bus bar bracket 8 is preferably a plastic bus bar bracket. The heat distortion temperature of the plastic bus bar bracket is ≧100° C., and the flame retardancy satisfies the UL94 V0 grade. The plastic bus bar bracket may be made of a material such as polyamide resin (PA66) or polybutylene terephthalate (PET).

[0087] It is preferable that a foam adhesive 5 is provided between the cell tab of the cell laminate and the box body 1. The foam adhesive 5 may wrap at least a part of the cell tab and the bus bar 9.

[0088] In the present embodiment, the electrode fixing component 200 is connected to the output electrode of the cell laminate, and the bus bar 9 is fastened to the nut 821 by a bolt or the like. Thereafter, the entire electrode fixing component 200 and the cell laminate are attached to the box body 1 and fixedly connected to the box body 1. By fastening the bus bar 9 to the nut 821 by a bolt or the like before the cell laminate enters the box body 1, it is possible to avoid a situation where the output electrode gap is displaced during the assembly process. That is, by integrally injection-molding the first bus bar support portion 81 and the second bus bar support portion 82 as mounting components, it helps to accurately align the space between the bus bar 9 and the second bus bar support portion 82, and thereby the bus bar 9 and the adapter bus bar 6 can be accurately fixed.

[0089] In the above, the electrode fixing component 200 of the present embodiment has been described by taking as an example the use for fixing the third output positive electrode 303 and the third output negative electrode 304 shown in FIG. 2, but the present invention is not limited thereto. As long as the output electrode can be fixed using the electrode fixing component 200 described above, the specific position of the output electrode in the box body 1 is not particularly limited. For example, in some embodiments, the third output positive electrode 303 and the third output negative electrode 304 shown in FIG. 1 may be fixed using the electrode fixing component 200 provided in the present embodiment, and it is only necessary to provide a fixing structure that engages with the electrode fixing component 200 on the side beam 122 of the box body 1.

[0090] Third Embodiment

[0091] The electrode fixing component 300 of the present embodiment may be used to fix the first output positive electrode 301 and the second output negative electrode 402 shown in FIG. 1, or may be used to fix the first output negative electrode 302 and the second output positive electrode 401 shown in FIG. 1.

[0092] FIG. 17 is a diagram showing the electrode fixing component 300 of the present embodiment, and illustrates the electrical connection structure between two cell stacks 3 and 4. FIG. 18 is a cross-sectional view taken along line B-B of the structure shown in FIG. 17.

[0093] Referring to FIGS. 17 and 18, the electrode fixing component 300 includes a bus bar bracket 8, a bus bar 9, and a transition bus bar 601. Among them, the bus bar bracket 8 may be fixed on the middle beam 123 of the box body 1 of the box body and includes a pre-embedded nut 821 provided inside. There are two bus bars 9, one of which is connected to the first cell stack 3 and the other is connected to the second cell stack 4. The transition bus bar 601 overlaps and connects with both of the two bus bars 9.

[0094] In the present embodiment, when the first cell stack 3 and the second cell stack 4 are attached to the box body 1, the two bus bars 9 respectively connected to the two cell stacks 3 and 4 are first fixed on the bus bar bracket 8 in a form corresponding to the nuts. Then, the transition bus bar 601 is attached, and after the bolt 83 passes through the transition bus bar 601, the bus bar 9, and the nut in sequence, the bolt 83 is fastened. In this way, the high-voltage electrical connection between the two cell stacks 3 and 4 can be realized.

[0095] The electrical connection structure of this embodiment can achieve high-voltage connection between different cell stacks in the pouch-type battery CTP, and has a short wiring distance, which is beneficial for enhancing the stability of electrical connection and reducing electrical risks. After the cell stack is attached to the box body 1, the installation is completed as long as the bus bars 9 are interconnected and fastened, and the assembly process is simplified. In addition, the electrical connection structure is simple, has a small volume, basically has no extra structural members, occupies less space in the box body 1 of the structural members, and thus can reduce the occupied volume of the electrical connection structure in the box body 1. Further, by providing the transition bus bar 601, since the transition bus bar 601 is connected to two bus bars 9, the requirements for component accuracy can be reduced to a certain extent, which is beneficial for improving the manufacturing and installation efficiency and reducing the manufacturing and installation costs.

[0096] In the above, the electrode fixing component 300 of this embodiment has been described by taking as an example the use for fixing the first output positive electrode 301 and the second output negative electrode 402 shown in FIG. 1, or the first output negative electrode 302 and the second output positive electrode 401 shown in FIG. 1. However, the present invention is not limited thereto. As long as the output electrodes can be fixed using the electrode fixing component 300 described above, the specific positions of the output electrodes in the box body 1 are not particularly limited.

[0097] Fourth Embodiment

[0098] The electrode fixing component 400 of this embodiment may be used for fixing the first output positive electrode 301 and the second output negative electrode 402 shown in FIG. 1, and for fixing the first output negative electrode 302 and the second output positive electrode 401 shown in FIG. 1.

[0099] FIG. 19 is an exploded view of a pouch-type battery CTP battery pack adopting the laminate distribution corresponding to FIG. 1. FIG. 20 is a partial enlarged view of FIG. 19, in which the structural diagram of the electrode fixing component 400 of this embodiment is illustrated. FIG. 21 is a diagram showing the electrode fixing component 400 of this embodiment, and illustrates the electrical connection structure between two cell stacks 3 and 4.

[0100] Referring to FIGS. 19 to 21, the electrode fixing component 400 includes a bus bar bracket 8 and a bus bar 9. Among them, the bus bar bracket 8 may be fixed on the middle beam 123 of the box body 1 and includes a pre-embedded nut 821 provided inside thereof. There are two bus bars 9. One of them 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 of them 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..

[0101] In this embodiment, in the process of attaching the two cell stacks 3 and 4 to the box body 1, first, the bus bar 9 that overlaps and is connected to the cell stack that first enters the box body 1 is overlapped on the bus bar bracket 8, and then the bus bar 9 that overlaps and is connected to the cell stack that is later attached to the box body is overlapped on the bus bar 9 connected to the cell stack that was first put into the box body. In this way, the position of one of the bus bars 9 on the bus bar bracket 8 is higher than the position of the other bus bar 9 on the bus bar bracket 8 in the Z-axis direction. More specifically, the position of the bus bar 9 connected to the cell stack that later enters the box body 1 on the bus bar bracket 8 is higher than the position of the bus bar 9 connected to the cell stack that was first put into the box body on the bus bar bracket 8. After the two bus bars 9 connected to the two cell stacks 3 and 4 respectively overlap and are connected on the bus bar bracket 8, the bolt 83 directly penetrates through the two overlapped and connected bus bars 9 and the nut in sequence, and then is fastened using the bolt 83. In this way, a high-voltage electrical connection between the two cell stacks 3 and 4 is realized. Since the electrical connection structure of this embodiment omits the transition bus bar 601 of the above embodiment 3, the required installation space is further reduced, and the risk related to insulation is further reduced.

[0102] In the above, the electrode fixing component 400 of the present embodiment has been described by taking as an example the use for fixing the first output positive electrode 301 and the second output negative electrode 402 shown in FIG. 1, and the first output negative electrode 302 and the second output positive electrode 401 shown in FIG. 1. However, the present invention is not limited thereto. As long as the electrode fixing component 400 described above can fix the output electrodes, the specific positions of the output electrodes in the box body 1 are not particularly limited.

[0103] Fifth Embodiment

[0104] The electrode fixing component 500 of the present embodiment may be used for fixing the first output positive electrode 301 and the first output negative electrode 302 shown in FIG. 2, and / or for fixing the second output positive electrode 401 and the second output negative electrode 402 shown in FIG. 2.

[0105] FIG. 22 is an exploded view of a pouch-type battery CTP battery pack adopting the laminate distribution corresponding to FIG. 2. In the pouch-type battery CTP structure, most of the internal space of the box body 1 is used for arranging the cell laminate, and thus the mounting arrangement space for the remaining mounting members is limited. By using an electrode fixing component with high mountability and small volume to save many mounting parts, the mounting space required for the output electrodes is effectively reduced, the mounting difficulty of the output electrodes is lowered, and the volume space inside the box body 1 is utilized to the maximum extent.

[0106] FIG. 23 is a structural diagram of the electrode fixing component 500 in the present embodiment. FIGS. 24 and 25 are exploded views of the structure shown in FIG. 23.

[0107] Referring to FIGS. 23 to 25, the electrode fixing component 500 includes a busbar bracket 8 and a busbar 9. Among them, 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 a pre-assembled nut 821 provided inside.

[0108] The first bus bar support part includes a mounting plate 801, a pair of positioning holes 802, and a pair of guide strips 803. The pair of guide strips 803 are formed by bending both sides of the mounting plate 801 in the Y-axis direction toward the X-axis direction. The guide strip 803 has a length in the Z-axis direction and a width in the X-axis direction. A pair of protrusion structures are provided above the guide strip 803, and the pair of positioning holes 802 are provided on the upper surfaces of the pair of protrusion structures. The bus bar 9 is connected to the mounting plate 801 of the first bus bar support part 81 by hot riveting, buckling, integral injection molding, etc. A through hole 8011 is provided in the mounting plate 801, and the through hole 8011 is used to penetrate the cell tab of the output electrode and weld it to the bus bar 9.

[0109] The second bus bar support part 82 includes a head part 701 and a body part 702. One end of the body part 702 is connected to the head part 701, and the other end extends downward along the Z-axis direction. A pre-embedded nut 821 is embedded inside the head part 701. The upper surface of the head part 701 overlaps and connects so as to engage with the bent part 92 of the bus bar 9. Slots 703 are provided on both sides of the body part 702. The inner width of the slot of the slot 703 is made to coincide with the thickness of the guide strip 803 so that the slot 703 can be engaged and inserted into the guide strip 803. Thereby, a part of the cell tab of the bus bar 9 is provided in an insulated manner in the first bus bar support part 81 and the second bus bar support part 82. The inner width of the slot at the entrance part of the slot 703 is larger than the inner width of the slot at the main body part of the slot 703.

[0110] When installing, by inserting a tool into the positioning hole 802 to limit the position, it is possible to avoid the occurrence of sway when attaching the bus bar 9 and the first bus bar support portion 81, thereby improving the installation accuracy. By engaging the guide strip 803 with the slot 703, the assembly process between the first bus bar support portion 81 and the second bus bar support portion 82 can be made more convenient and smooth. After assembling the first bus bar support portion 81 and the second bus bar support portion 82 together, the bus bar 9 can be more preferably positioned between the first bus bar support portion 81 and the second bus bar support portion 82.

[0111] The installation of the guide strip 803 and the positioning hole 802 makes the position more accurate when installing the cell stack, and the installation process becomes easier, reducing the difficulty and cost of installation. In addition, the guide strip 803 can play a role in positioning the first bus bar support portion 81 and the second bus bar support portion 82, and can insulate and protect the bus bar 9 to prevent contact between the bus bar 9 and the side beam 122 of the box body 1.

[0112] In this embodiment, the second bus bar support portion 82 may be pre-attached to the box body 1 (a structure on the box body middle beam 123 and / or the side beam 122). When the cell stack enters the box body, the first bus bar support portion 81 connected to the cell stack can be engaged with the second bus bar support portion 82 for attachment.

[0113] In the above, the electrode fixing component 500 of this embodiment has been described by taking as an example the use for fixing the first output positive electrode 301 and the first output negative electrode 302 shown in FIG. 2, or the second output positive electrode 401 and the second output negative electrode 402 shown in FIG. 2, but the present invention is not limited thereto. As long as the output electrodes can be fixed using the electrode fixing component 500 described above, the specific positions of the output electrodes in the box body 1 are not particularly limited.

[0114] Sixth Embodiment

[0115] The electrode fixing component 600 of the present embodiment may be used to fix the first output positive electrode 301 and the first output negative electrode 302 shown in FIG. 2, or the second output positive electrode 401 and the second output negative electrode 402 shown in FIG. 2.

[0116] FIG. 26 is a structural diagram of the electrode fixing component 600 in the present embodiment. Referring to FIG. 26, the electrode fixing component 600 includes a bus bar bracket 8 and a bus bar 9. Among them, the bus bar bracket 8 includes a first bus bar support portion 81 and a second bus bar support portion 82, and the second bus bar support portion 82 includes a pre-embedded nut 821 provided inside. Among them, the first bus bar support portion 81 and the second bus bar support portion 82 are integrated as mounting components and injection molded.

[0117] The bus bar 9 is connected to the first bus bar support portion 81 by hot riveting, buckling, integral injection molding, etc. A positioning block 901 and a buckle 902 are provided on the side of the bus bar bracket 8.

[0118] By mounting the first bus bar support portion 81 and the second bus bar support portion 82, it is not necessary to perform an alignment step between the bus bar 9 and the pre-embedded nut 821 of the second bus bar support portion 82 in the manufacturing process, thereby simplifying the manufacturing process and improving the manufacturability.

[0119] In the present embodiment, the electrode fixing component 600 is pre-mounted during installation. After the cell tab is welded to the bus bar 9, the cell stack is placed in the box. During installation, the position is controlled by fastening the tool to the positioning block 901 of the bus bar bracket 8. After the installation is completed, the bus bar bracket 8 can be smoothly engaged and fixed with the box 1 (the structure on the box middle beam 123 and / or the side beam 122) using the buckle 902. That is, the attachment between the electrode fixing component 600 and the box 1 can be realized when the cell stack is placed in the box.

[0120] In the above, the electrode fixing component 600 of the present embodiment has been described by taking as an example the use for fixing the first output positive electrode 301 and the first output negative electrode 302 shown in FIG. 2, or the second output positive electrode 401 and the second output negative electrode 402 shown in FIG. 2. However, the present invention is not limited thereto. As long as the output electrodes can be fixed using the electrode fixing component 600 described above, the specific positions of the output electrodes in the box body 1 are not particularly limited.

[0121] Among them, in the arrangement shown in FIG. 2, between the bus bar 9 on the electrode fixing component 500 or the bus bar 9 on the electrode fixing component 600 and the bus bar 9 on the electrode fixing component 100 or the bus bar 9 on the electrode fixing component 200, they are electrically connected via the adapter bus bar 6, and the adapter bus bar 6 is supported and fixed by the bus bar bracket 8 of the above-described electrode fixing component.

[0122] Another point to be separately explained is that in the above, embodiments of a plurality of types of electrode fixing components are provided. Among them, the bus bar bracket of the electrode fixing component may be a separable type or an integral type. The separable bus bar bracket may be attached corresponding to the side beam of the box body, or may be attached corresponding to the middle beam of the box body. Similarly, the integral bus bar bracket may be attached corresponding to the side beam of the box body, or may be attached corresponding to the middle beam of the box body. That is, the different states (separated or integral) of the bus bar bracket have no relation to the appropriate mounting position (side beam or middle beam) in the box body. Also, any of the electrode fixing components 100 to 600 may be an adapter fixing component between two cell laminate bodies or may be an output electrode fixing component for the entire battery pack.

[0123] The above is only a preferred embodiment of the present invention and does not limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Industrial Applicability

[0124] The battery pack of the present invention and the electric vehicle equipped with the battery pack can be applied in the field of power battery technology.

Explanation of Signs

[0125] 1: Box body 3: First cell stack 4: Second cell stack 5: Foam adhesive 6: Adapter bus bar 7: Pouch-type battery cell unit 8: Bus bar bracket 9: Bus bar 10: Support base 12: Lower housing 13: Upper lid 21: First chamber 22: Second chamber 32: Side plate 71: Cell tab (electrode lead-out part) 81: First bus bar support part 82: Second bus bar support part 83: Bolt 84: Buckle 91: Main body part (plate-shaped main body) 92: Bent part (output connection part) 100, 200, 300, 400, 500, 600: Electrode fixing component 101: Engagement hole 102: Plate part 121: Lower housing bottom plate 122: Side beam 123: Box body middle beam 203: Side plate 204: Back plate 205: Upper plate 206: Lower plate 301: First output positive electrode 302: First output negative electrode 303: Third output positive electrode 304: Third output negative electrode 401: Second output positive electrode 402: Second output negative electrode 501: Backplane 502: Through-hole 503: Rib 601: Transition bus bar 701: Head 702: Body part 703: Slot 801: Mounting plate 802: Positioning hole 803: Guide strip 811: First backplane 812: Second backplane 813: Side plate 814: Through-hole 815: Rib 821: Nut 822: Partition part 901: Positioning block 902: Buckle 911: Fixing hole 921: Opening 2051: Partition part 2061: Buckle 8011: Through-hole

Claims

1. A battery pack comprising: a box body including a bottom plate; a cell stack located within the box body and formed by stacking a plurality of pouch-type battery cells, wherein an electrode lead-out portion is provided at an end of the cell stack in the longitudinal direction of the pouch-type battery cell; a thermally conductive structural adhesive directly bonded between the cell stack and the bottom plate; an electrode fixing component located at an end of the cell stack where the electrode lead-out portion is formed, including a bus bar and a bus bar bracket for supporting the bus bar, wherein the bus bar bracket is engaged and connected to the box body, and the electrode lead-out portion is fixed to the bus bar; and characterized in that it is a battery pack.

2. The box body includes a beam fixed to the bottom plate; the bus bar bracket includes a nut member pre-embedded therein; the bus bar bracket is directly fixed to the beam or fixed to the beam via a connection structure; the bus bar is connected to the bus bar bracket in a form corresponding to the installation of the nut member. Characterized in that it is the battery pack according to Claim 1.

3. The bus bar includes a plate-shaped body and an output connection portion, and the output connection portion is formed by bending and extending an end of the plate-shaped body; the bus bar bracket includes a first bus bar support portion and a second bus bar support portion, the second bus bar support portion includes the nut member pre-embedded therein, and is directly fixed to the beam or fixed to the beam via a connection structure; the plate-shaped body is fixedly connected in a form of being in surface contact with the first bus bar support portion; the output connection portion is fixedly connected to the second bus bar support portion in a form of overlapping and connecting with the nut member. Characterized in that it is the battery pack according to Claim 2.

4. A long hole is provided in the output connection portion, and the long hole has a length extending along the stacking direction of the pouch-type battery cells; the output connection portion is fixedly connected to the second bus bar support portion using a bolt that sequentially penetrates the long hole and the nut member. Characterized in that it is the battery pack according to Claim 3.

5. The first bus bar support portion is provided with a shielding plate, the shielding plate is located between the cell stack and the bus bar, and the plate-shaped body is bonded to a surface of the shielding plate parallel to the stacking direction of the pouch-type battery cells. Characterized in that The battery pack according to claim 3.

6. The second bus bar support portion includes a buckle that engages with the beam or the connection structure. Characterized in that The battery pack according to claim 3.

7. The top of the nut member is higher than the upper surface of the second bus bar 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 bar support portion satisfies 0.3 mm ≤ D ≤ 0.5 mm. Characterized in that The battery pack according to claim 3.

8. The thickness H of the wall at the position corresponding to the nut member of the second bus bar support portion satisfies 1.2 mm ≤ H ≤ 1.8 mm. Characterized in that The battery pack according to claim 7.

9. A foaming adhesive is filled between the cell stack and the beam, and the foaming adhesive wraps at least a part of the electrode lead-out portion and at least a part of the bus bar. Characterized in that The battery pack according to any one of claims 1 to 3.

10. There are two bus bars. The first bus bar support portion is provided with a first partition portion for separating the plate-like main bodies of the two bus bars. The second bus bar support portion is provided with a second partition portion for separating the output connection portions of the two bus bars. Characterized in that The battery pack according to claim 3.

11. The first bus bar support portion is provided with two through holes for passing the electrode lead-out portion, and the two through holes are arranged separately on two sides of the first partition portion. Characterized in that The battery pack according to claim 10.

12. The bus bar bracket is provided with a positioning block for being clamped by a tool. Characterized in that The battery pack according to claim 2.

13. A positioning hole for inserting a tool is provided at the top of the bus bar bracket. Characterized in that The battery pack according to claim 2.

14. One of the first bus bar support portion and the second bus bar support portion is provided with a guide strip, and the other is provided with a slot into which the guide strip engages and is inserted. Characterized in that The battery pack according to claim 3.

15. The first bus bar support portion is provided with a through hole for passing the electrode lead-out portion. Characterized in that The battery pack according to claim 3.

16. The first bus bar support part and the second bus bar support part are integrally formed. Characterized in that The battery pack according to any one of claims 3 to 8 and 10 to 15.

17. Two electrode lead-out parts are provided at one end in the longitudinal direction of the pouch-type battery cell of the cell stack, The positive and negative polarities of the two electrode lead-out parts are opposite, and they are adjacent to each other in the stacking direction of the pouch-type battery cell, The two electrode lead-out parts respectively penetrate the two through holes and are respectively fixed to the two bus bars Characterized in that The battery pack according to claim 11.

18. Two electrode lead-out parts are provided at one end in the longitudinal direction of the pouch-type battery cell of the cell stack, The positive and negative polarities of the two electrode lead-out parts are opposite, and they are arranged separately at the two ends in the stacking direction of the pouch-type battery cell of the cell stack, There are two electrode fixing components. One of the electrode lead-out parts is fixed to the bus bar of one of the electrode fixing components, and the other electrode lead-out part is fixed to the bus bar of the other electrode fixing component. Characterized in that The battery pack according to any one of claims 12 to 15.

19. The beam includes a side beam and a middle beam. The side beam provided along the edge of the bottom plate surrounds to form an installation space. The middle beam extends along the stacking direction of the pouch-type battery cell to partition the installation space into a first installation space and a second installation space. The cell stack includes a first cell stack attached to the first installation space and a second cell stack attached to the second installation space. A first electrode lead-out part is provided at an end of the first cell stack close to the second cell stack, and a second electrode lead-out part is provided at an end of the second cell stack close to the first cell stack. The positive and negative polarities of the first electrode lead-out part and the second electrode lead-out part are opposite, and they are provided corresponding to each other with the middle beam interposed therebetween. The bus bar bracket is directly fixed to the middle beam or fixed to the middle beam through a connection structure. The bus bar includes a first bus bar that is at least partially located in the first mounting space and a second bus bar that is at least partially located in the second mounting space, and the bus bar bracket supports the first bus bar and the second bus bar that are 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. characterized in that The battery pack according to claim 2.

20. The first bus bar includes a plate-shaped main body and an output connection portion formed by bending and extending an end portion of the plate-shaped main body. The second bus bar includes a plate-shaped main body and an output connection portion formed by bending and extending an end portion of the plate-shaped main body. The bus bar bracket supports the output connection portions of the first bus bar and the second bus bar that are spaced apart from each other. The bus bar further includes a transition bus bar, and the transition bus bar is connected between the output connection portion of the first bus bar and the output connection portion of the second bus bar. One bolt penetrates the transition bus bar and the output connection portion of the first bus bar and is engaged and connected with one nut member pre-assembled inside the bus bar bracket. Another bolt penetrates the transition bus bar and the output connection portion of the second bus bar and is engaged and connected with another nut member pre-assembled inside the bus bar bracket. The first electrode lead-out portion is fixed to the plate-shaped main body of the first bus bar, and the second electrode lead-out portion is fixed to the plate-shaped main body of the second bus bar. characterized in that The battery pack according to claim 19.

21. The first bus bar includes a plate-shaped main body and an output connection portion formed by bending and extending an end portion of the plate-shaped main body. The second bus bar includes a plate-shaped main body and an output connection portion formed by bending and extending an end portion of the plate-shaped main body. The bus bar bracket supports the output connection portions of the first bus bar and the second bus bar that are vertically overlapped and connected to each other. A bolt penetrates the output connection portions of the first bus bar and the second bus bar and is engaged and connected with a nut member pre-assembled inside the bus bar bracket. The first electrode lead-out part is fixed to the plate-shaped main body of the first bus bar, and the second electrode lead-out part is fixed to the plate-shaped main body of the second bus bar. Characterized in that The battery pack according to claim 19.

22. The beam includes a side beam and a middle beam. The side beam provided along the edge of the bottom plate surrounds to form a mounting space. The middle beam extends along the stacking direction of the pouch-type battery cells to partition the mounting space into a first mounting space and a second mounting space. The cell stack includes a first cell stack mounted in the first mounting space and a second cell stack mounted in the second mounting space. A first positive electrode lead-out part and a first negative electrode lead-out part are provided at an end of the first cell stack close to the second cell stack. The first positive electrode lead-out part and the first negative electrode lead-out part are separately arranged at two ends of the cell stack in the stacking direction of the pouch-type battery cells. A second positive electrode lead-out part and a second negative electrode lead-out part are provided at an end of the second cell stack close to the first cell stack. The second positive electrode lead-out part and the second negative electrode lead-out part are separately arranged at two ends of the cell stack in the stacking direction of the pouch-type battery cells, and the positions of the first positive electrode lead-out part and the second negative electrode lead-out part correspond to each other, and the positions of the first negative electrode lead-out part and the second positive electrode lead-out part correspond to each other. A third positive electrode lead-out part and a third negative electrode lead-out part are provided at an end of the first cell stack far from the second cell stack. The third positive electrode lead-out part and the third negative electrode lead-out part are adjacent to each other in the stacking direction of the pouch-type battery cells. The electrode fixing component includes a first electrode fixing component, a second electrode fixing component, and a third electrode fixing component. The bus bar bracket of the first electrode fixing component is directly fixed to the middle beam or fixed to the middle beam through a connection structure. The first positive electrode lead-out part and the second negative electrode lead-out part are respectively fixed to two electrically connected bus bars of the first electrode fixing component. The bus bar bracket of the second electrode fixing component is directly fixed to the middle beam or fixed to the middle beam through a connection structure. The first negative electrode lead-out part and the second positive electrode lead-out part are respectively fixed to two electrically connected bus bars of the second electrode fixing component. The bus bar bracket of the third electrode fixing component is directly fixed to the side beam or fixed to the side beam through a connection structure, and the third positive electrode lead-out part and the third negative electrode lead-out part are respectively fixed to two spaced-apart bus bars of the third electrode fixing component. Characterized in that The battery pack according to claim 2.

23. The beam includes a side beam and a middle beam. The side beam provided along the edge of the bottom plate surrounds to form an installation space. The middle beam extends along the stacking direction of the pouch-type battery cells to partition the installation space into a first installation space and a second installation space. The cell stack includes a first cell stack mounted in the first mounting space and a second cell stack mounted in the second mounting space. A first positive electrode lead-out part and a first negative electrode lead-out part are provided at an end of the first cell stack far from the second cell stack. The first positive electrode lead-out part and the first negative electrode lead-out part are separately arranged at two ends of the cell stack in the stacking direction of the pouch-type battery cells. A second positive electrode lead-out part and a second negative electrode lead-out part are provided at an end of the second cell stack close to the first cell stack. The second positive electrode lead-out part and the second negative electrode lead-out part are separately arranged at two ends of the cell stack in the stacking direction of the pouch-type battery cells. A third positive electrode lead-out part and a third negative electrode lead-out part are provided at an end of the first cell stack close to the second cell stack. The third positive electrode lead-out part and the third negative electrode lead-out part are adjacent to each other in the stacking direction of the pouch-type battery cells. The electrode fixing component includes a first electrode fixing component, a second electrode fixing component, a third electrode fixing component, a fourth electrode fixing component, and a fifth electrode fixing component. The bus bar bracket of the first electrode fixing component is directly fixed to the side beam or fixed to the side beam through a connection structure, and the first positive electrode lead-out part is fixed to the bus bar of the first electrode fixing component. The bus bar bracket of the second electrode fixing component is directly fixed to the side beam or fixed to the side beam through a connection structure, and the first negative electrode lead-out part is fixed to the bus bar of the second electrode fixing component. The bus bar bracket of the third electrode fixing component is directly fixed to the middle beam or fixed to the middle beam through a connection structure, and the second positive electrode lead-out part is fixed to the bus bar of the third electrode fixing component. The bus bar bracket of the fourth electrode fixing component is directly fixed to the middle beam or fixed to the middle beam through a connection structure, and the second negative electrode lead-out part is fixed to the bus bar of the fourth electrode fixing component. The bus bar bracket of the fifth electrode fixing component is directly fixed to the middle beam or fixed to the middle beam through a connection structure, and the third positive electrode lead-out part and the third negative electrode lead-out part are respectively fixed to two spaced-apart bus bars of the fifth electrode fixing component. Characterized in that The battery pack according to claim 2.

24. An elastic member is provided between the second bus bar support part and the beam. Characterized in that The battery pack according to claim 2.

25. The battery pack according to any one of claims 1 to 8, 10 to 15, 17, 19 to 24 is mounted on An electric vehicle.

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