Battery cell and battery pack

Abstract

The utility model provides a battery unit and a battery pack, the battery unit comprises at least two battery packs, each battery pack comprises at least two battery core stacking bodies and a middle plate connected between two adjacent battery core stacking bodies in each battery pack; and the connecting assembly is connected between the respective middle plates in the at least two adjacent battery packs. According to the battery unit and the battery pack provided by the invention, the plurality of battery packs are connected into a whole through the connecting assemblies, and when the battery unit as a whole is subjected to mechanical vibration or mechanical impact, the whole is difficult to move relative to the battery pack box body under the action of mechanical vibration or mechanical impact due to relatively large weight; and therefore, the connection between the battery units and the battery pack box body is more reliable, and the safety and reliability of the battery pack can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, and in particular to a battery unit and a battery pack. BACKGROUND

[0002] With the increasing penetration rate of new energy vehicles, commercial vehicles have increasingly high requirements for the cruising range of new energy vehicles. In the related technology, in order to improve the energy density of the battery pack installed in the new energy vehicle, a plurality of cell stacks can be directly installed in the battery pack box.

[0003] However, during the driving of the vehicle, the battery pack will also be subjected to mechanical vibration and mechanical impact, and then the problem of loose connection between the cell stack and the battery pack box may occur. UTILITY MODEL CONTENT

[0004] Therefore, the present application aims to provide a battery unit and a battery pack to at least partially solve the problem of loose connection between the cell stack and the battery pack box.

[0005] To achieve the above purpose, the first aspect of the present application provides a battery unit, comprising: at least two battery groups, each of the battery groups comprising at least two cell stacks, and a middle plate connected between adjacent two cell stacks in each of the battery groups; and a connecting assembly connected between the middle plates of adjacent two battery groups.

[0006] Optionally, the connecting assembly comprises a connecting frame, and the connecting frame is connected to the middle plate of each of the adjacent two battery groups.

[0007] Optionally, the connecting frame is connected to the top of the middle plate by a fastener.

[0008] Optionally, the at least two battery groups are arranged along a first direction, and the connecting frame comprises a plate-shaped frame body, and an edge of the frame body extending along the first direction is provided with a bent edge.

[0009] Optionally, the connecting assembly comprises a connecting beam, and the connecting beam is connected to the middle plate of each of the battery groups.

[0010] Optionally, each middle plate is provided with a beam hole penetrating along the first direction, and the connecting beam is arranged in the beam hole.

[0011] Optionally, the connecting beam is arranged in parallel with at least two.

[0012] Optionally, the connecting assembly comprises an adhesive layer, and the adhesive layer is connected to each of the adjacent two battery groups.

[0013] Optionally, a glue blocking strip is arranged between the side walls of two adjacent battery groups, so that a groove structure is formed between the side wall of the battery group and the glue blocking strip, and the adhesive layer is arranged in the groove structure.

[0014] Based on the same inventive concept, the second aspect of the present application further provides a battery pack comprising the battery unit according to the first aspect.

[0015] Optionally, the battery pack comprises a battery pack box, and the battery unit is arranged in the battery pack box, and the connecting assembly comprises a connecting frame connected to the top of the middle plate by a fastener, and the fastener is connected to the battery pack box through the middle plate.

[0016] As can be seen from the above, the battery unit and the battery pack provided by the present application connect multiple battery groups into a whole through the connecting assembly. When the battery unit as a whole is subjected to mechanical vibration or mechanical impact, the whole is difficult to move relative to the battery pack box under the action of mechanical vibration or mechanical impact due to the large weight, thereby making the connection between the battery unit and the battery pack box more reliable and helping to improve the safety and reliability of the battery pack.

[0017] Meanwhile, the fixed connection of the two cell stack bodies and the battery pack box can be achieved through a middle plate, which helps to reduce the space occupied by the structural members other than the cell stack bodies in the battery pack box, thereby enabling more cell stack bodies to be arranged in the battery pack box and helping to improve the space utilization and energy density in the battery pack box. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present application or related art, the following will briefly introduce the drawings needed to be used in the embodiments or related art descriptions. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 It is a schematic view of the battery unit of the embodiment of the present application;

[0020] Figure 2 It is a top view schematic view of the battery unit of the embodiment of the present application;

[0021] Figure 3 It is a partial schematic view of the battery unit of the embodiment of the present application;

[0022] Figure 4 It is a partial schematic view of the battery unit of the embodiment of the present application; Figure 3 It is an enlarged schematic view of the middle B part;

[0023] Figure 5Part exploded schematic view of a battery cell of the embodiment of the present application;

[0024] Figure 6 Part exploded schematic view of a battery cell of the embodiment of the present application; Figure 2 Part cross-sectional view along A-A section of the battery cell of the embodiment of the present application;

[0025] Figure 7 Part schematic view of a battery pack of the embodiment of the present application;

[0026] Figure 8 Part cross-sectional view along C-C section of the battery pack of the embodiment of the present application. Figure 7

[0027] BRIEF DESCRIPTION OF DRAWINGS

[0028] 100, battery pack; 110, cell stack; 120, middle plate; 121, insertion slot; 122, lintel hole; 130, end plate; 140, binding belt;

[0029] 200, connecting assembly; 210, connecting frame; 211, frame body; 212, bent edge; 220, connecting beam; 230, adhesive layer; 240, adhesive blocking strip;

[0030] 300, battery pack box; 310, bottom plate; 311, bottom beam. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the embodiments and the accompanying drawings.

[0032] It should be noted that: unless otherwise specified, the relative arrangement, numerical expression and numerical value of the components set forth in these embodiments do not limit the scope of the present application.

[0033] Meanwhile, it should be understood that, in order to facilitate the description, the size of each part shown in the drawings is not drawn in accordance with the actual proportional relationship.

[0034] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting of the application or its use or functionality.

[0035] ​It should be noted that the technical terms or scientific terms used in the embodiments of the present application should be understood as the general meaning understood by those skilled in the art to which the embodiments of the present application belong, unless otherwise defined. The terms "first", "second" and the like used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. The terms "include" or "contain" and the like mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0036] In some embodiments, each cell stack is connected with a connecting structure, and the connecting structure is connected with the battery pack box through a bolt. The applicant found that if each cell stack is connected with the battery pack box through a respective connecting structure, the influence on a single cell stack is greater when the battery pack is subjected to mechanical vibration or mechanical impact, and the original torque of the bolt fixing the connecting structure may be attenuated, resulting in a greater possibility of loose connection between the connecting structure and the battery pack box.

[0037] However, if multiple cell stacks are combined into a whole, the influence of mechanical vibration or mechanical impact on the whole will be correspondingly reduced due to the greater weight of the whole. At the same time, each connecting structure can fix the whole, so the possibility of loose connection between the whole and the battery pack box will be reduced.

[0038] Therefore, the embodiments of the present application provide a battery unit, as shown in Figure 1 , Figure 1 A schematic diagram of a battery unit is shown, which includes: at least two battery groups 100, each battery group 100 including at least two cell stacks 110, and a middle plate 120 connected between adjacent two cell stacks 110 in each battery group 100, the middle plate 120 being used to connect with a battery pack box 300; and a connecting assembly 200 connected between respective middle plates 120 in at least two adjacent battery groups 100.

[0039] For example, a battery group 100 can include two cell stacks 110, and a middle plate 120 connected between the two cell stacks 110, and an end plate 130 connected to the side of the cell stack 110 away from the middle plate 120. The two end plates 130 and the middle plate 120 can be connected by a binding strap 140.

[0040] Exemplarily, in the battery unit, a plurality of battery groups 100 are arranged along a first direction (e.g. Y direction in the figure) ; in a single battery group 100, at least two cell stacks 110 are arranged along a second direction (e.g. X direction in the figure) ; and the first direction and the second direction are perpendicular. Figure 1 Figure 1

[0041] Exemplarily, the connecting assembly 200 can be connected with the middle plate 120 by means of bonding, plugging, welding or fastener connection, etc.

[0042] Exemplarily, the same connecting assembly 200 can connect the respective middle plates 120 in two battery groups 100, or the respective middle plates 120 in a plurality of battery groups 100.

[0043] Exemplarily, the middle plate 120 and the battery pack box 300 can be connected by means of bonding, clamping or fastener connection, etc.

[0044] After the respective middle plates 120 in two adjacent battery groups 100 are connected by the connecting assembly 200, and since the middle plate 120 is connected with the cell stack 110, all the cell stacks 110 in all the battery groups 100 are connected as a whole. When the whole is subjected to mechanical vibration or mechanical impact, it is difficult for the mechanical vibration and the mechanical impact to drive the whole to move relative to the battery pack box 300 due to the large weight of the whole, and thus the possibility of loose connection between the middle plate 120 and the battery pack box 300 is reduced.

[0045] Meanwhile, since the whole is connected with the battery pack box 300 through a plurality of middle plates 120, when loose connection occurs between one of the middle plates 120 and the battery pack box 300, the other middle plates 120 can still reliably fix the whole in the preset position in the battery pack box 300.

[0046] The battery unit provided by the embodiment of the present application connects a plurality of battery groups 100 as a whole through the connecting assembly 200. When the battery unit as a whole is subjected to mechanical vibration or mechanical impact, the whole is difficult to move relative to the battery pack box 300 due to the large weight under the action of the mechanical vibration or the mechanical impact, and thus the connection between the battery unit and the battery pack box 300 is more reliable, which helps to improve the safety and reliability of the battery pack using the battery unit of the embodiment.

[0047] ​​Meanwhile, the two cell stack bodies 110 can be fixedly connected to the battery pack box 300 through the middle plate 120, which helps to reduce the space occupied by the structural members other than the cell stack bodies 110 in the battery pack box 300, and thus more cell stack bodies 110 can be arranged in the battery pack box 300, which helps to improve the space utilization and energy density of the battery pack box 300.

[0048] As Figure 2 , Figure 2 A top view of a battery unit is shown. In some embodiments, the connecting assembly 200 includes a connecting frame 210 connected to the middle plates 120 in the adjacent two battery groups 100, respectively.

[0049] For example, the connecting frame 210 can be connected to the middle plate 120 by bonding, welding, inserting, clamping or fastening, etc.

[0050] For example, the connecting frame 210 extends along the first direction.

[0051] For example, the connecting frame 210 can be connected to the top or bottom of the middle plate 120.

[0052] For example, the material of the connecting frame 210 can be a rigid material such as metal.

[0053] The middle plates 120 in the adjacent two battery groups 100 can be arranged side by side along the first direction, and the adjacent two middle plates 120 are connected by the connecting frame 210. On the one hand, since the connecting frame 210 can be directly connected to the plate surface of the middle plate 120, the middle plate 120 does not need to be provided with additional structures for the connecting frame 210, which helps to simplify the structure of the middle plate 120 and reduce the manufacturing cost. At the same time, directly connecting the connecting frame 210 to the surface of the middle plate 120 also helps to reduce the assembly difficulty, improve the assembly efficiency of the battery unit, and is beneficial to mass production.

[0054] As Figure 3 , Figure 3 A partial view of a battery unit is shown. In some embodiments, the connecting frame 210 is connected to the top of the middle plate 120 by a fastener.

[0055] For example, the fastener can be a screw or a bolt.

[0056] Connecting the connecting frame 210 to the top of the middle plate 120 by a fastener facilitates the installation of the fastener by the assembly personnel, which helps to reduce the assembly difficulty between the connecting frame 210 and the middle plate 120, and facilitates the assembly of the battery unit.

[0057] As Figure 2 and Figure 3In some embodiments, the at least two battery groups 100 are arranged along the first direction, and the connecting frame 210 comprises a plate-shaped frame body 211, and an edge of the frame body 211 extending along the first direction is provided with a bent edge 212.

[0058] For example, the connecting frame 210 can be formed by a sheet metal stamping process to form the frame body 211 and the bent edge 212 integrally.

[0059] For example, the bent edge 212 is bent towards a direction away from the middle plate 120.

[0060] The plate-shaped frame body 211 can better conform to the surface of the middle plate 120, which helps to make the connection between the connecting frame 210 and the middle plate 120 more reliable. The bent edge 212 on the frame body 211 can play a reinforcing role, which helps to improve the strength and rigidity of the connecting frame 210, ensures that the adjacent two middle plates 120 can be reliably and stably connected, and makes the connecting frame 210 not easy to fall into the gap during installation.

[0061] For example, Figure 4 , Figure 4 For example, Figure 3 An enlarged schematic view of part B is shown. In some embodiments, the connecting assembly 200 comprises a connecting beam 220, which is connected with the respective middle plate 120 in each of the battery groups 100.

[0062] For example, the connecting beam 220 can be made of a rigid material such as metal.

[0063] For example, the connecting beam 220 can be connected with the middle plate 120 by means of bonding, insertion, clamping, welding or fasteners.

[0064] For example, Figure 5 , Figure 5 For example, Figure 5 An enlarged schematic view of part B is shown. In some embodiments, the connecting assembly 200 comprises a connecting beam 220, which is connected with the respective middle plate 120 in each of the battery groups 100.

[0065] The connecting beam 220 of the present embodiment adopts another way different from the connecting frame 210 (i.e., connecting two adjacent middle plates 120), which connects all the middle plates 120 through the same connecting beam 220, which can further avoid relative movement between the plurality of battery groups 100, so that the plurality of battery groups 100 can be more stably connected as a whole, and the connection reliability and stability of the battery groups 100 and the battery pack box 300 are enhanced.

[0066] For example, Figure 4 and Figure 5In some embodiments, each middle plate 120 is provided with a beam hole 122 penetrating in the first direction, and the connecting beam 220 is arranged in the beam hole 122.

[0067] For example, the middle plate 120 is provided with a through hole penetrating in the width direction of the middle plate 120, and the through hole is used to reduce the weight and material consumption of the middle plate 120. Meanwhile, the through hole can also be configured as the beam hole 122.

[0068] For example, the radial section of the beam hole 122 is a polygon, such as a rectangle or a triangle.

[0069] The applicant has found that if the connecting beam 220 is connected to the surface of the middle plate 120, the connecting beam 220 will hinder the connection between the battery cell stack 110 and the surface of the middle plate 120. In order to avoid the above problem, in the present embodiment, the beam hole 122 penetrating in the first direction is arranged on the middle plate 120, and the connecting beam 220 can pass through the middle plate 120 from the inside in the width direction of the middle plate 120 through the beam hole 122, and no longer passes through the surface of the middle plate 120, so that the battery cell stack 110 can be connected to the surface of the middle plate 120, which helps to improve the connection reliability between the battery cell stack 110 and the middle plate 120. Meanwhile, it can also avoid damage to the battery cell stack 110 caused by the connecting beam 220.

[0070] For example, the connecting beam 220 is arranged in the beam hole 122. Figure 5 In some embodiments, the connecting beam 220 is arranged in parallel with at least two.

[0071] For example, the two connecting beams 220 are arranged in parallel in the second direction, or the two connecting beams 220 are arranged in parallel in the height direction of the middle plate 120 (such as the Z direction in the middle plate 120). Figure 5

[0072] For example, the two connecting beams 220 are arranged in different beam holes 122, that is, only one connecting beam 220 is arranged in each beam hole 122, so as to avoid that the connecting beam 220 arranged in the beam hole 122 in advance hinders the arrangement of the connecting beam 220 arranged later.

[0073] The arrangement of at least two connecting beams 220 in parallel can further improve the fixing effect of the connecting beam 220 on the middle plate 120, avoid the bending or breaking of the connecting beam 220 during use, and further improve the stability of the whole connected by the plurality of battery packs 100, and further improve the connection reliability and stability of the battery pack 100 and the battery pack box 300.

[0074] For example, the connecting beam 220 is arranged in the beam hole 122. Figure 6 , Figure 6 It is shown that Figure 2 ​A cross-sectional view of the middle A-A section. In some embodiments, the connecting assembly 200 comprises an adhesive layer 230, which is connected to two adjacent battery packs 100 respectively.

[0075] For example, the adhesive layer 230 can be formed by solid glue or solidified from fluid glue.

[0076] For example, the adhesive layer 230 is connected to the cell stack 110, the middle plate 120 and the end plate 130 of the battery pack 100.

[0077] For example, the adhesive layer 230 extends in the second direction.

[0078] For example, in the height direction of the battery pack 100, the adhesive layer 230 does not exceed the top of the cell stack 110.

[0079] The adhesive layer 230 is arranged between two adjacent battery packs 100 to provide a connecting force to the two battery packs 100 through the adhesive layer 230, further improving the connection strength between different battery packs 100 and the overall stability of the battery unit connected by multiple battery packs 100.

[0080] For example, Figure 6 In some embodiments, a glue blocking strip 240 is arranged between the side walls of two adjacent battery packs 100, so that a groove structure is formed between the side wall of the battery pack 100 and the glue blocking strip 240, and the adhesive layer 230 is arranged in the groove structure.

[0081] For example, in the height direction of the battery pack 100, the glue blocking strip 240 is located near the top of the battery pack 100.

[0082] For example, the adhesive layer 230 of the present embodiment is formed by solidifying fluid glue.

[0083] Before arranging the adhesive layer 230, the glue blocking strip 240 is arranged between two adjacent battery packs 100, and the glue blocking strip 240 is connected to the opposite side walls of the two battery packs 100 respectively, so that the glue blocking strip 240 and the side walls of the two battery packs 100 form a U-shaped groove structure for accommodating fluid glue. After the fluid glue is solidified in the groove structure, the adhesive layer 230 is formed. The height position of the glue blocking strip 240 on the side wall of the battery pack 100 can be determined according to the preset size of the adhesive layer 230 in the height direction of the battery pack 100 and the amount of glue kept in the groove structure. In other words, the glue blocking strip 240 can limit the position and size of the adhesive layer 230.

[0084] Specifically, if the size of the adhesive layer 230 along the height direction of the battery pack 100 needs to be large, i.e., the connection area of the adhesive layer 230 with the battery pack 100 needs to be large, the glue blocking strip 240 can be made to be far away from the top of the battery pack 100, and the amount of glue kept in the groove structure can be made to be large. If the size of the adhesive layer 230 along the height direction of the battery pack 100 needs to be small, i.e., the connection area of the adhesive layer 230 with the battery pack 100 needs to be small, the glue blocking strip 240 can be made to be close to the top of the battery pack 100, and the amount of glue kept in the groove structure can be made to be small.

[0085] It should be noted that the reason why the fluid glue is used to form the adhesive layer 230 in the embodiment is that when the side wall of the battery pack 100 is a non-planar surface, the fluid glue can better fit the side wall to ensure that the adhesive layer 230 can be more reliably connected with the battery pack 100.

[0086] Based on the same inventive concept and the description of the battery cell in each of the above embodiments, the embodiment provides a battery pack, which has the corresponding technical effects of the battery cell in each of the above embodiments, and details are not repeated here.

[0087] A battery pack includes the battery cell as in each of the above embodiments.

[0088] Figure 7 Part of the top view of the battery pack is shown, Figure 8 Part of the top view of the battery pack is shown, Figure 7 A cross-sectional view of the middle C-C section is shown.

[0089] As Figure 7 As Figure 8 In some embodiments, the battery pack includes a battery pack box 300, the battery cell is arranged in the battery pack box 300, and the connecting assembly 200 includes a connecting frame 210 connected to the top of the middle plate 120 by a fastener, and the fastener is connected to the battery pack box 300 through the middle plate 120.

[0090] For example, the fastener is a long bolt.

[0091] For example, the battery pack box 300 includes a bottom plate 310 and a bottom beam 311 protruding from the surface of the bottom plate 310, the cell stack 110 of the battery pack 100 is arranged on the surface of the bottom plate 310, and the middle plate 120 is connected to the bottom beam 311 by a fastener.

[0092] For example, the bottom beam 311 can extend along a first direction, and since the plurality of battery packs 100 in the battery pack box 300 are also arranged along the first direction, the middle plate 120 of each of the plurality of battery packs 100 can be connected to the same bottom beam 311, which helps to simplify the internal structure of the battery pack box 300.

[0093] For example, asFigure 5 And Figure 8 The bottom of the middle plate 120 can be provided with a plug-in groove 121 matched with the bottom beam 311, when the battery pack 100 is in surface contact with the bottom plate 310, the bottom beam 311 is inserted into the plug-in groove 121, so as to realize the positioning of the battery pack 100 through the cooperation of the bottom beam 311 and the middle plate 120.

[0094] The fastener for fixing the connecting frame 210 can pass through the middle plate 120 from the top of the middle plate 120 and extend out from the bottom of the middle plate 120 to be connected with the battery pack box 300. At this time, the fastener is not only used for the connection between the connecting frame 210 and the middle plate 120, but also used for the connection between the middle plate 120 and the battery pack box 300. Through the same fastener, different functions can be realized at the same time, which helps to reduce the number of parts of the battery pack, reduce the cost of the battery pack, and facilitate the assembly of the battery pack, and is conducive to mass production.

[0095] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in a different order than the order described above and still achieve desirable results. In addition, the processes depicted in the figures do not necessarily require the particular order shown or sequential order to achieve the desired results. In certain implementations, multitasking and parallel processing can be advantageous.

[0096] Each of the embodiments in the present application is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0097] The description of the present application is given for example and description, and is not exhaustive or limits the present application to the disclosed form. Many modifications and changes are obvious to those skilled in the art. The selection and description of embodiments are to better illustrate the principles and practical application of the present application, and to enable those skilled in the art to understand the present application so as to design various embodiments with various modifications suitable for specific purposes.

[0098] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to limit the scope of the present application to these examples; under the idea of the present application, the above embodiments or technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the embodiments of the present application as described above. In order to be brief, they are not provided in detail.

[0099] While the application has been described in connection with specific embodiments thereof, it will be understood that many modifications, substitutions, and changes will be apparent to those of ordinary skill in the art from the foregoing description.

[0100] It is intended to cover all alternatives, modifications, and variations of this application falling within the scope of the application. Accordingly, any and all such alternatives, modifications and variations should be included within the scope of the present application.

Claims

1. A battery cell, characterized by, The application relates to a battery pack and a battery unit. The battery pack comprises at least two battery groups, each of which comprises at least two cell stacks and a middle plate connected between two adjacent cell stacks in each battery group. A connecting assembly is connected between the middle plates of at least two adjacent battery groups.

2. The battery cell of claim 1, wherein, The connecting assembly comprises a connecting frame connected to the middle plates of two adjacent battery groups respectively.

3. The battery cell of claim 2, wherein, The connecting frame is connected to the top of the middle plates by fasteners.

4. The battery cell of claim 2, wherein, The at least two battery groups are arranged in a first direction, and the connecting frame comprises a plate-shaped frame body, and the edge of the frame body extending in the first direction is provided with a bent edge.

5. The battery cell of claim 1, wherein, The connecting assembly comprises a connecting beam connected to the middle plates of all the battery groups respectively.

6. The battery cell of claim 5, wherein, Each middle plate is provided with a beam hole penetrating in the first direction, and the connecting beam is arranged in the beam hole.

7. The battery cell of claim 5, wherein, The connecting beam is arranged in parallel with at least two connecting beams.

8. The battery cell of claim 1, wherein, The connecting assembly comprises an adhesive layer connected to two adjacent battery groups respectively.

9. The battery cell of claim 8, wherein, A glue-blocking strip is arranged between the side walls of two adjacent battery groups, so that a groove structure is formed between the side walls of the battery groups and the glue-blocking strip, and the adhesive layer is arranged in the groove structure.

10. A battery pack, characterized by, The application further relates to a battery unit comprising any one of the battery units according to claims 1 to 9.

11. The battery pack of claim 10, wherein, The battery pack comprises a battery pack box, the battery unit is arranged in the battery pack box, the connecting assembly comprises a connecting frame connected to the top of the middle plates by fasteners, and the fasteners are connected to the battery pack box through the middle plates.

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