Battery pack

Abstract

The utility model provides a battery pack. The battery pack includes: a case; the battery cell group is accommodated in the box body; the busbar is arranged on the battery cell group and is used for connecting positive and negative pole columns of two adjacent battery cells in the battery cell group; the pressing plate is arranged between two adjacent battery cell groups and is connected with the box body, and at least one part of the pressing plate is pressed on the busbar; and the insulating buffer piece is arranged between the busbar and the pressing plate. The utility model solves the problem of complex production and assembly process of the battery pack in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, and in particular to a battery pack. Background Art

[0002] With the rapid development of new energy technologies, electric vehicles have developed rapidly. Among them, new energy batteries play a vital role in the overall structure of electric vehicles. Battery packs come in a variety of shapes and structures. Battery packs generally include a battery cell group formed by multiple battery cells and a busbar connecting adjacent battery cells. The busbar and the poles of the battery cells are mostly connected by welding, which leads to a high cost in manufacturing battery packs. At the same time, the welding process requires a high-demand process, otherwise the high temperature generated by welding will interfere with other structures inside the battery pack and even damage other heat-sensitive parts.

[0003] As can be seen from the above, the prior art has the problem of complex production and assembly process of battery packs. Utility Model Content

[0004] The main purpose of the utility model is to provide a battery pack to solve the problem of complex production and assembly process of the battery pack in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a battery pack, including: a box body; a battery cell group, the battery cell group is accommodated in the box body; a bus, the bus is arranged on the battery cell group and is used to connect the positive and negative poles of two adjacent battery cells in the battery cell group; a pressure plate, the pressure plate is arranged between two adjacent battery cell groups and connected to the box body, and at least a part of the pressure plate is pressed on the bus.

[0006] Furthermore, there are multiple busbars, and the pressure plate is provided with multiple connecting structures. The multiple busbars and the multiple connecting structures are arranged in one-to-one correspondence, and each connecting structure is detachably connected to the busbar.

[0007] Furthermore, the battery pack further includes an insulating buffer, which is arranged between the busbar and the pressure plate. There are multiple insulating buffers, wherein the multiple insulating buffers are arranged in groups of two, one group of insulating buffers corresponds to one busbar, and the two insulating buffers in one group are arranged at intervals to avoid the connection structure; or the multiple insulating buffers are arranged in a one-to-one correspondence with the multiple connection structures, and the insulating buffers are provided with avoidance holes for avoiding the connection structures.

[0008] Furthermore, the connection structure includes a buckle, and the bus is correspondingly provided with a buckle hole, and the buckle is buckled and matched with the buckle hole.

[0009] Furthermore, the pressing plate has a plurality of positioning protrusions, the insulating buffer is provided with a plurality of positioning holes, and the plurality of positioning protrusions and the plurality of positioning holes are arranged in a one-to-one correspondence.

[0010] Furthermore, the pressing plate includes a connecting portion and a pressing portion, the connecting portion is connected to the box body, and the pressing portion is pressed on the busbar.

[0011] Furthermore, the pressure plate includes a first pressure plate and a second pressure plate, the first pressure plate is T-shaped, and the first pressure plate is arranged between two adjacent battery cell groups; the second pressure plate is L-shaped, and the second pressure plate is arranged between the outermost battery cell group and the side plate of the box body.

[0012] Further, the first pressure plate includes a connecting portion and a pressing portion, the connecting portion is connected to the box body, there are two pressing portions, the two pressing portions are respectively located on both sides of the connecting portion, and are respectively pressed on the bus bars on two adjacent battery cell groups; or the first pressure plate includes two symmetrical and spaced-apart sub-pressure plates, the sub-pressure plates include a sub-connecting portion and a pressing portion, the sub-connecting portions of the two sub-pressure plates are respectively connected to the box body, and the pressing portions of the two sub-pressure plates are respectively pressed on the bus bars on two adjacent battery cell groups.

[0013] Furthermore, the battery pack also includes: a positioning piece, which is arranged at both ends of the pressure plate and is used to position and stop the two ends of the battery cell group respectively; and / or a reinforcing rib, which is multiple and is arranged at intervals along the length direction of the pressure plate at the connection part and / or the connection between the connection part and the pressing part.

[0014] Furthermore, the box body includes a connecting beam, which is vertically disposed in the box body and located between two adjacent battery cell groups and / or between the battery cell group and the box body, and the connecting portion is fixedly connected to the connecting beam.

[0015] By applying the technical solution of the utility model, a battery pack includes a case, a cell group, a bus and a pressing plate. The cell group is accommodated in the case, and the bus is arranged on the cell group for connecting the positive and negative poles of two adjacent cells in the cell group. The pressing plate is arranged between two adjacent cell groups and connected to the case, and at least a part of the pressing plate is pressed on the bus. By changing the connection mode between the bus and the cell poles to a crimping and fixing mode, the force generated in the process of connecting the pressing plate to the case is used to squeeze the bus, so that the bus is connected and fixed to the positive and negative poles of the two adjacent cells, thereby avoiding damaging other components in the battery pack by welding, simplifying the battery pack production and assembly process, reducing the production cost of the battery pack, and solving the problem of complex production and assembly process of the battery pack in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 An exploded view of a battery pack in a specific embodiment of the present invention is shown; and

[0018] Figure 2 A schematic diagram of the assembly structure of a pressing plate and a battery cell group in a specific embodiment of the utility model is shown;

[0019] Figure 3 Shows Figure 2 A partial enlarged view of the middle A;

[0020] Figure 4 A schematic diagram of the assembly structure of a pressing plate, an insulating buffer and a busbar in a specific embodiment of the utility model is shown;

[0021] Figure 5 Shows Figure 4 Exploded diagram of

[0022] Figure 6 A schematic diagram of the assembly structure of a pressing plate, an insulating buffer and a busbar in another specific embodiment of the utility model is shown;

[0023] Figure 7 Shows Figure 6 Exploded diagram of

[0024] Figure 8 Shows Figure 2 The cross-sectional view at B in the middle;

[0025] Fig. 9 A schematic structural diagram showing an angle of a first pressing plate in a specific embodiment of the utility model is shown;

[0026] Fig.10 A schematic structural diagram showing another angle of the first pressing plate in a specific embodiment of the utility model is shown;

[0027] Fig.11 A schematic structural diagram of a first pressing plate in another specific embodiment of the utility model is shown;

[0028] Fig.12 A schematic structural diagram showing an angle of a second pressing plate in a specific embodiment of the utility model is shown;

[0029] Fig.13 A schematic structural diagram showing another angle of the second pressing plate in a specific embodiment of the utility model is shown;

[0030] Fig.14 The figure shows a schematic structural diagram of a busbar in a specific embodiment of the utility model.

[0031] The above drawings include the following reference numerals:

[0032] 10. Box body; 20. Cell group; 30. Bus bar; 31. Snap-in hole; 40. Press plate; 41. Connection structure; 42. Positioning protrusion; 43. Connection part; 44. Pressing part; 45. Sub-connection part; 50. Insulating buffer; 51. Avoidance hole; 52. Positioning hole; 60. Positioning part; 70. Reinforcement rib; 80. Connection beam; 90. Thermal pad. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0035] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0036] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0037] In order to solve the problem of complex production and assembly process of battery packs in the prior art, the utility model provides a battery pack.

[0038] like Figures 1 to 8 As shown, the battery pack includes a box body 10, a battery cell group 20, a bus bar 30 and a pressure plate 40. The battery cell group 20 is accommodated in the box body 10. The bus bar 30 is arranged on the battery cell group 20, and is used to connect the positive and negative poles of two adjacent battery cells in the battery cell group 20. The pressure plate 40 is arranged between two adjacent battery cell groups 20 and connected to the box body 10, and at least a part of the pressure plate 40 is pressed on the bus bar 30.

[0039] By changing the connection method between the bus 30 and the battery cell poles to a crimping fixation method, the force generated by the pressure plate 40 in the process of connecting the box body 10 is used to squeeze the bus 30, thereby connecting and fixing the bus 30 to the positive and negative poles of two adjacent battery cells, avoiding welding to damage other components in the battery pack, simplifying the battery pack production and assembly process, and reducing the production cost of the battery pack.

[0040] like Figures 4 to 7 , Fig.10 and Fig.13 As shown, there are multiple busbars 30 , and the pressure plate 40 is provided with multiple connecting structures 41 . The multiple busbars 30 and the multiple connecting structures 41 are arranged in one-to-one correspondence, and each connecting structure 41 is detachably connected to the busbar 30 .

[0041] Specifically, the connection structure 41 and the busbar 30 can be connected by clamping or bonding, and the connection structure 41 extends toward the busbar 30 and is integrally formed with the pressing plate 40. By connecting multiple busbars 30 to multiple connection structures 41, the positive and negative poles of the cells in the cell group 20 are connected in sequence, and one pressing plate 40 presses and fixes multiple busbars 30 at the same time, ensuring the stability of the electrical connection between the cells in the cell group 20.

[0042] like Figures 4 to 5 As shown, the battery pack further includes an insulating buffer 50, which is arranged between the bus 30 and the pressing plate 40. There are multiple insulating buffers 50, wherein the multiple insulating buffers 50 are arranged in groups of two, one group of insulating buffers 50 corresponds to one bus 30, and the two insulating buffers 50 in one group are arranged at intervals to avoid the connection structure 41. Specifically, the two insulating buffers 50 are square sheet structures, and the width is adapted to the width of the bus 30. The two insulating buffers 50 are respectively arranged at both ends of the bus 30, and are arranged corresponding to the poles of two adjacent battery cells, so as to avoid the connection structure 41 while ensuring that the force brought by the pressing plate 40 squeezing the insulating buffer 50 can directly act on the bus 30 and the poles of the battery cell, so that the bus 30 and the poles fit more closely, ensuring the firmness of the crimping.

[0043] In this embodiment, the pressing plate 40 is made of non-insulating material, and the insulating buffer 50 is made of rubber material, specifically a rubber pad. The insulating buffer 50 is used to achieve insulating buffering between the pressing plate 40 and the busbar 30 .

[0044] Furthermore, when the pressing plate 40 is made of insulating material, the insulating buffer 50 may not be provided, and the pressing plate 40 itself can be used to achieve insulating buffering with the busbar 30 .

[0045] In another embodiment of the present application, Figure 6 to Figure 7 As shown, a plurality of insulating buffers 50 are arranged in one-to-one correspondence with a plurality of connecting structures 41, and the insulating buffers 50 are provided with avoidance holes 51 for avoiding the connecting structures 41. Specifically, the insulating buffers 50 are long strip structures whose shapes match the busbars 30, and the size of the avoidance holes 51 is larger than the size of the connecting structures 41. The avoidance holes 51 are arranged in correspondence with the clamping holes 31, and the connecting structures 41 pass through the insulating buffers 50 and the busbars 30 in sequence during installation.

[0046] Furthermore, when installing the battery pack 20, the surface of the processed battery cell may be uneven. In order to ensure the reliability of the busbar 30 connecting the battery cell pole, a thermal pad 90 may be provided at the bottom of the battery pack 20. Figure 8 The thermal pad 90 is made of silica gel or thermally conductive glue, and has a thickness of 1 to 2 mm. The thermal pad 90 can be compressed, which can alleviate the problem of uneven height of the battery cell group 20 and play a role in absorbing the flatness tolerance of the battery cells.

[0047] In this embodiment, if Figure 5 , Figure 7 and Fig.13 As shown, the connection structure 41 includes a buckle, and the busbar 30 is correspondingly provided with a buckle hole 31 , and the buckle is buckled and matched with the buckle hole 31 .

[0048] Specifically, the buckle and the pressure plate 40 are integrally formed, and the subsequent assembly steps can be simplified by pre-connecting the buckle with the snap-fit ​​hole 31 on the bus 30. The connection structure 41 has a certain elasticity and can be compressed and inserted into the snap-fit ​​hole 31.

[0049] Furthermore, a groove is provided near the clamping hole 31 of the busbar 30, and the inner wall of the groove is smooth, so that the connecting structure 41 can slide into the clamping hole 31 during installation, thereby facilitating the connection between the busbar 30 and the pressure plate 40. Fig.14 shown.

[0050] Furthermore, the busbar 30 can be made of copper or aluminum alloy, which is not easy to oxidize and can increase the service life. Of course, aluminum can also be used, but the material needs to be metal-plated on the surface to delay the oxidation of aluminum. Since the busbar 30 and the pole are connected by contact, the side in contact with the battery pole needs to be polished and smoothed. Similarly, the battery pole also needs to be polished to ensure that the contact surface can be fully engaged and reduce the contact resistance.

[0051] like Figure 5 As shown, the pressing plate 40 has a plurality of positioning protrusions 42 , and the insulating buffer 50 is provided with a plurality of positioning holes 52 . The plurality of positioning protrusions 42 and the plurality of positioning holes 52 are arranged in a one-to-one correspondence.

[0052] Specifically, the positioning holes 52 are arranged along the diagonal of the insulating buffer 50, so as to ensure the firmness of the connection between the pressure plate 40 and the insulating buffer 50 under the premise of reducing the positioning protrusions 42 and the positioning holes 52. The insulating buffer 50 can be prevented from shaking after installation by matching multiple positioning holes 52 with multiple positioning protrusions 42, and it is also convenient for installation. In this embodiment, the positioning protrusion 42 is a positioning column, and optionally, the positioning protrusion 42 is a positioning cone. Furthermore, when one insulating buffer 50 corresponds to one bus 30, the setting of the positioning hole 52 can be cancelled, and the buckle can be set as a hot willow column.

[0053] like Figures 3 to 13 As shown, the pressing plate 40 includes a connecting portion 43 and a pressing portion 44 , the connecting portion 43 is connected to the box body 10 , and the pressing portion 44 is pressed on the busbar 30 .

[0054] Specifically, a plurality of through holes are arranged at intervals on the connecting portion 43, and screws are passed through the through holes to connect with the box body 10. By tightening the screws, the pressing portion 44 of the pressing plate 40 is driven to squeeze the insulating buffer 50 and then squeeze the bus 30, and finally complete the crimping between the bus 30 and the battery cell.

[0055] In this embodiment, the pressure plate 40 includes a first pressure plate and a second pressure plate, the first pressure plate is T-shaped and is arranged between two adjacent battery cell groups 20, and the second pressure plate is L-shaped and is arranged between the outermost battery cell group 20 and the side plate of the box body 10.

[0056] Specifically, a plurality of battery cell groups 20 are arranged in the box 10, and a first pressing plate is used between two adjacent battery cell groups 20, and the first pressing plate and a plurality of bus bars 30 are used to simultaneously realize electrical connection of the poles on the two adjacent battery cell groups 20. A second pressing plate is used between the inner wall of the box 10 and the outermost battery cell group 20, and the second pressing plate and the bus bar 30 are used to realize electrical connection of the poles on the outermost battery cell group 20, and the second pressing plate includes a connecting portion 43 and a pressing portion 44, and the two form an L shape, such as Fig.12 and Fig.13 shown.

[0057] In this embodiment, if Figures 3 to 11 As shown, the first pressing plate includes a connecting portion 43 and two pressing portions 44, the connecting portion 43 is connected to the box body 10, and the two pressing portions 44 are respectively located on both sides of the connecting portion 43 and are respectively pressed on the busbars 30 on two adjacent battery cell groups 20. Specifically, the connecting portion 43 is a U-shaped structure, extending downward between the two adjacent battery cell groups 20, and the two pressing portions 44 are respectively connected to the ends of the connecting portion 43 in sequence, thereby forming a "X"-shaped structure. Further, the first pressing plate is an integrally formed structure.

[0058] In another embodiment of the present application, Fig.11As shown, the first pressing plate includes two symmetrical and spaced sub-pressing plates, the sub-pressing plates include a sub-connecting portion 45 and a pressing portion 44, the sub-connecting portions 45 of the two sub-pressing plates are respectively connected to the box body 10, and the pressing portions 44 of the two sub-pressing plates are respectively pressed on the busbars 30 on two adjacent battery cell groups 20. In other words, one sub-pressing plate corresponds to one battery cell group 20, and the two sub-pressing plates are spaced between two adjacent battery cell groups 20 along the arrangement direction of the battery cell groups 20. By pressing the two adjacent battery cell groups 20 with the two sub-pressing plates, it can be ensured that the busbars 30 connected to the poles of the battery cell group 20 are subjected to sufficient pressure. At the same time, it is convenient to disassemble a single battery cell group 20.

[0059] like Figures 3 to 7 as well as Fig.10 As shown, the battery pack further includes a positioning member 60 and a reinforcing rib 70. The positioning member 60 is disposed at both ends of the pressure plate 40, and is used to position and stop at both ends of the battery cell group 20. There are multiple reinforcing ribs 70, and the multiple reinforcing ribs 70 are spaced along the length direction of the pressure plate 40 at the connection portion 43 and / or the connection between the connection portion 43 and the pressing portion 44.

[0060] Specifically, the positioning member 60 and the pressing plate 40 are integrally formed or welded, and two positioning members 60 are arranged on both sides of the pressing plate 40, so that the pressing plate 40 is easily aligned with the battery cell group 20 during installation. At the same time, the present application adopts a module-free technology, and the two positioning members 60 can serve as a limit stop for the battery cell group 20. The reinforcing ribs 70 can strengthen the overall structural strength of the pressing plate 40.

[0061] Furthermore, when the first pressing plate is an integrated structure, the reinforcing rib 70 is provided on the connecting portion 43 and the connection between the connecting portion 43 and the pressing portion 44, and the connection is located on the inner side of the pressing plate 40. When the first pressing plate is a split structure, i.e., includes two sub-pressing plates, the reinforcing rib 70 is provided on the sub-connecting portion 45 and the connection between the connecting portion 43 and the pressing portion 44, and the connection is also located on the inner side of the pressing plate 40.

[0062] like Figure 3 and Figure 8 As shown, the box body 10 includes a connecting beam 80 , which is vertically disposed in the box body 10 and located between two adjacent battery cell groups 20 and / or between the battery cell group 20 and the box body 10 , and the connecting portion 43 is connected and fixed to the connecting beam 80 .

[0063] Specifically, the connecting beam 80 is provided with a plurality of threaded holes arranged at intervals, and bolts pass through the pressure plate 40 and are connected to the threaded holes. Furthermore, there are a plurality of connecting beams 80, and the plurality of connecting beams 80 are arranged inside the box body 10 at intervals along the width direction of the box body 10, and a battery cell group 20 is arranged between any two adjacent connecting beams 80.

[0064] Furthermore, the connecting beam 80 between the battery cell group 20 and the box body 10 can also be formed by protruding inwardly from the side wall of the box body 10. In other words, the connecting beam 80 at this location is an integrated structure with the side wall of the box body 10. Of course, the connecting beam 80 between two adjacent battery cell groups 20 can also be formed in one piece with the bottom plate of the box body 10 to improve the structural strength and ensure the stability of the connection.

[0065] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: by setting the battery pack including the box body 10, the battery cell group 20, the bus bar 30, the pressure plate 40 and the insulating buffer 50, the battery cell group 20 is accommodated in the box body 10, the bus bar 30 is arranged on the battery cell group 20, and is used to connect the positive and negative poles of two adjacent battery cells in the battery cell group 20, the pressure plate 40 is arranged between the two adjacent battery cell groups 20 and connected to the box body 10, at least a part of the pressure plate 40 is pressed on the bus bar 30, and the insulating buffer 50 is arranged between the bus bar 30 and the pressure plate 40. By changing the connection mode between the busbar 30 and the battery cell pole into a crimping fixation mode, and setting an insulating buffer 50 between the busbar 30 and the pressing plate 40, the insulating buffer 50 is squeezed by the force generated in the process of connecting the pressing plate 40 to the box body 10, and then the busbar 30 is squeezed, so that the busbar 30 is connected and fixed to the positive and negative poles of the two adjacent battery cells, thereby ensuring the connection reliability and achieving insulation, avoiding damage to other components in the battery pack by welding, simplifying the battery pack production and assembly process, and reducing the production cost of the battery pack.

[0066] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0067] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0068] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery pack, characterized in that: include: Box body (10); A battery cell group (20), the battery cell group (20) being accommodated in the box (10); A busbar (30), the busbar (30) being arranged on the battery cell group (20) and being used to connect the positive and negative poles of two adjacent battery cells in the battery cell group (20); A pressure plate (40), wherein the pressure plate (40) is arranged between two adjacent battery cell groups (20) and / or between the battery cell group (20) and the box body (10), and is connected to the box body (10), and at least a portion of the pressure plate (40) is pressed onto the bus bar (30).

2. The battery pack according to claim 1, characterized in that: There are a plurality of busbars (30), and the pressure plate (40) is provided with a plurality of connection structures (41). The plurality of busbars (30) and the plurality of connection structures (41) are arranged in one-to-one correspondence, and each connection structure (41) is detachably connected to the busbar (30).

3. The battery pack according to claim 2, characterized in that: The battery pack further comprises an insulating buffer (50), wherein the insulating buffer (50) is arranged between the busbar (30) and the pressing plate (40), and there are a plurality of insulating buffers (50), wherein: A plurality of the insulating buffer members (50) are arranged in groups of two, one group of the insulating buffer members (50) corresponds to one busbar (30), and two insulating buffer members (50) in one group are arranged at intervals to avoid the connection structure (41); or The plurality of insulating buffers (50) are arranged in one-to-one correspondence with the plurality of connecting structures (41), and the insulating buffers (50) are provided with avoidance holes (51) for avoiding the connecting structures (41).

4. The battery pack according to claim 2, characterized in that: The connection structure (41) comprises a buckle, and the busbar (30) is correspondingly provided with a buckle hole (31), and the buckle is buckled and matched with the buckle hole (31).

5. The battery pack according to claim 3, characterized in that: The pressing plate (40) has a plurality of positioning protrusions (42), the insulating buffer member (50) is provided with a plurality of positioning holes (52), and the plurality of positioning protrusions (42) and the plurality of positioning holes (52) are arranged in a one-to-one correspondence.

6. The battery pack according to claim 1, characterized in that: The pressing plate (40) comprises a connecting portion (43) and a pressing portion (44); the connecting portion (43) is connected to the box body (10); and the pressing portion (44) is pressed onto the busbar (30).

7. The battery pack according to claim 1, characterized in that: The pressing plate (40) comprises a first pressing plate and a second pressing plate, wherein the first pressing plate is T-shaped and is arranged between two adjacent battery cell groups (20); and the second pressing plate is L-shaped and is arranged between the outermost battery cell group (20) and a side plate of the box body (10).

8. The battery pack according to claim 7, characterized in that: The first pressing plate comprises a connecting portion (43) and a pressing portion (44), the connecting portion (43) being connected to the box body (10), and there are two pressing portions (44), the two pressing portions (44) being respectively located on both sides of the connecting portion (43) and respectively pressed on the bus bars (30) on two adjacent battery cell groups (20); or The first pressure plate comprises two symmetrical and spaced-apart sub-pressure plates, the sub-pressure plates comprising a sub-connecting portion (45) and a pressing portion (44), the sub-connecting portions (45) of the two sub-pressure plates being respectively connected to the box body (10), and the pressing portions (44) of the two sub-pressure plates being respectively pressed onto the bus bars (30) on two adjacent battery cell groups (20).

9. The battery pack according to claim 6, characterized in that: The battery pack further comprises: Positioning members (60), the positioning members (60) being arranged at two ends of the pressing plate (40) and used for positioning and stopping at two ends of the battery cell group (20) respectively; and / or A reinforcing rib (70), wherein the reinforcing rib (70) is in multiple numbers, and the multiple reinforcing ribs (70) are arranged at intervals along the length direction of the pressing plate (40) at the connection portion (43) and / or at the connection between the connection portion (43) and the pressing portion (44).

10. The battery pack according to claim 6, characterized in that: The box body (10) comprises a connecting beam (80), the connecting beam (80) being vertically disposed in the box body (10) and being located between two adjacent battery cell groups (20) and / or between the battery cell group (20) and the box body (10), and the connecting portion (43) being connected and fixed to the connecting beam (80).

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