Battery pack and power utilization system

Abstract

The utility model provides a battery pack and a power utilization system. The battery pack comprises a plurality of battery cells which are arranged along a first direction; the connecting sheet is connected with the two battery cells, and the connecting sheet is provided with a fixing hole; the mounting column is arranged in the fixing hole and is connected with the battery cell, a gap is formed between the mounting column and the fixing hole, and the gap is suitable for the mounting column to move in the fixing hole. The battery pack is simple and clear in design, the connection sheets can be fixed conveniently and quickly due to the matching of the mounting columns and the fixing holes, the battery cells can be connected more firmly, and the problems of insufficient connection strength and easiness in loosening possibly occurring in a traditional connection mode are avoided. By means of the design, the battery pack can be kept stable in external environments such as vibration and impact, and the reliability of the whole structure is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a battery pack and an electricity system. Background Art

[0002] In traditional battery pack designs, the positive and negative terminals of the battery cells are often connected by welding, riveting or simple mechanical connection of the connecting pieces. However, these connection methods are fixed through multiple parts and steps, the fixing position cannot be adjusted, and the installation and fixing are complicated and time-consuming. Utility Model Content

[0003] The utility model aims to provide a battery pack and an electric system, which simplifies the installation and fixing process of the battery core and improves the assembly efficiency.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A battery pack, characterized in that the battery pack comprises:

[0006] A plurality of battery cells, wherein the plurality of battery cells are arranged along a first direction;

[0007] A connecting piece, the connecting piece connects two battery cells, and the connecting piece has a fixing hole;

[0008] A mounting post is disposed in the fixing hole and connected to the battery cell, and a gap is provided between the mounting post and the fixing hole, wherein the gap is suitable for the mounting post to move in the fixing hole.

[0009] Preferably, the fixing hole includes a first hole position and a second hole position, and the first hole position is connected to the second hole position.

[0010] Preferably, the area of ​​the second hole position is larger than the area of ​​the first hole position.

[0011] Preferably, in the first direction, the maximum width of the second hole is greater than the maximum width of the first hole.

[0012] Preferably, detection points are provided on the battery core, and the fixing holes are used to make at least part of the detection points visible.

[0013] Preferably, the mounting column comprises a column head structure and a column tail structure, the cross-sectional area of ​​the column head structure perpendicular to the second direction is larger than the cross-sectional area of ​​the column tail structure perpendicular to the second direction, and the second direction is the same as the direction in which the mounting column protrudes from the battery cell.

[0014] Preferably, along the first direction, the maximum width of the column head structure is L1, the maximum width of the column tail structure is L2, the maximum width of the first hole position is L3, and L1, L2 and L3 satisfy:

[0015] L2≤L3<L1.

[0016] Preferably, the cross-sectional area of ​​the column head structure perpendicular to the second direction is S1, the cross-sectional area of ​​the column tail structure perpendicular to the second direction is S2, the second hole area is S3, and S1, S2 and S3 satisfy:

[0017] S1<S1≤S3.

[0018] Preferably, the mounting post and the battery core are integrally formed.

[0019] Preferably, the connecting sheet is provided with a protruding structure, the protruding structure protrudes along the second direction for connecting the adjacent battery cells, and the protruding structure extends along a third direction, and the third direction is parallel and upward along the contact surfaces of two adjacent battery cells.

[0020] According to a second aspect of the utility model, there is also provided an electricity system, which includes the above-mentioned battery pack.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The mounting post is allowed to move in the fixing hole through the cooperation between the mounting post and the fixing hole, which makes the connection between the battery cells flexible. This design can adapt to the slight deformation or displacement of the battery cell during use and maintain the stability of the connection. The gap design between the mounting post and the fixing hole allows the mounting post to have a certain movement and adjustment space in the fixing hole. This design allows the position of the battery cell to be fine-tuned during installation or use to adapt to different assembly requirements or compensate for manufacturing errors. At the same time, it also provides convenience for subsequent maintenance and replacement of battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative 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.

[0024] Figure 1 is a partial schematic diagram of a battery pack according to an embodiment of the utility model;

[0025] Figure 2 is a schematic diagram of a connecting piece according to an embodiment of the utility model;

[0026] Reference numerals:

[0027] 101: battery cell; 1011: positive terminal;

[0028] 1012: negative terminal; 1013: housing;

[0029] 1021: connecting piece; 1022: mounting column;

[0030] 10221: capital structure; 10222: column tail structure;

[0031] 1023: fixing hole; 10231: first hole position;

[0032] 10232: second hole position; DETAILED DESCRIPTION

[0033] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the description of this embodiment, the terms "upper", "lower", "right", and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present utility model.

[0036] The terms "first", "second" and the like in the specification and claims of the present utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0037] In this application Figure 1 As shown, the first direction D1 is the same as the direction in which the battery cells are arranged, the second direction D2 is the same as the direction in which the mounting column protrudes from the battery cells, and the third direction D3 is perpendicular to D1 and D2.

[0038] The utility model provides a battery pack, such as Figure 1 As shown, the battery pack includes: a battery cell 101, a connecting piece 1021 and a mounting post 1022. The connecting piece 1021 connects two battery cells, and the connecting piece 1021 has a fixing hole 1023; the mounting post 1022 is arranged on the battery cell, and the mounting post 1022 is arranged in the fixing hole 1023 and connected to the battery cell, and there is a gap between the mounting post 1022 and the fixing hole 1023, and the gap is suitable for the mounting post 1022 to move and adjust in the fixing hole 1023.

[0039] Through the cooperation between the mounting post and the fixing hole, the connection of the battery cells in the battery pack is more secure, avoiding the problems of insufficient connection strength and easy loosening that may occur in the traditional connection method. This design allows the battery pack to remain stable even under external environments such as vibration and impact, and improves the reliability of the overall structure. The mounting post directly passes through the fixing hole to connect the adjacent battery cells, reducing multiple components and installation steps, making the fixation and connection of the battery cells more concise and efficient, reducing the complexity and time consumption during the installation process, and improving production efficiency. The gap design between the mounting post and the fixing hole allows the mounting post to have a certain amount of movement and adjustment space in the fixing hole. This design allows the position of the battery cell to be fine-tuned during installation or use to adapt to different assembly requirements or compensate for manufacturing errors. At the same time, it also provides convenience for subsequent maintenance and replacement of the battery cell. At the same time, this design has a compact structure and occupies little space, which helps to maximize the capacity and energy density of the battery cell in a limited equipment space.

[0040] In a specific embodiment, the position of the fixing hole 1023 is not limited to a specific area, and in the design of the battery cell connecting piece 1021, the position of the fixing hole has great flexibility. It can be set at any position of the connecting piece according to actual needs and the specific structure of the battery cell. This design idea fully takes into account the diversity and variability of the battery cell connecting piece, so that the fixed structure can adapt to more types of battery cells and battery packs. Similarly, the shape of the connecting piece 1021 is not fixed. It can be arbitrarily designed according to the shape, size and connection requirements of the battery cell. Whether it is a straight shape, a curved shape or other special shapes, as long as it can meet the connection requirements of the positive and negative terminals and ensure effective cooperation with the mounting column and the fixing hole, it can be selected as the shape of the connecting piece. This design flexibility enables the battery cell connecting piece to better adapt to various complex battery pack structures and working environments.

[0041] like Figure 1As shown, the battery cell 101 includes a positive terminal 1011, a negative terminal 1012 and a shell 1013. The fixing hole 1023 on the connecting piece 1021 passes through the mounting post 1022 on the shell 1013 and is fixed tightly. The connecting piece 1021 firmly connects the positive terminal 1011 and the negative terminal 1012 together. At the same time, the mounting post 1022 passes through the fixing hole 1023 to fix the connecting piece 1021, which further enhances the stability of the structure and effectively prevents the battery cell from loosening or falling off during use, thereby improving the safety of the battery cell. The design is simple and clear, and the cooperation between the mounting post 1022 and the fixing hole 1023 makes it convenient and quick to fix the connecting piece 1021. This design not only reduces the difficulty of assembly during the production process, but also facilitates the subsequent maintenance and replacement of the battery cell.

[0042] In a specific embodiment, the battery cells 101 can be arranged horizontally or vertically in parallel in the battery pack, or can be stacked into multiple layers to make full use of the vertical space of the battery pack. In addition, an irregular arrangement can be used to maximize the use of space. For parallel arranged battery cells, the connecting piece can be designed in a linear shape, extending along the arrangement direction of the battery cells to connect adjacent battery cells; when the battery cells are arranged in layers, the connecting piece needs to be designed to span different levels of battery cells to achieve vertical connection. In some other embodiments, depending on the specific shape and arrangement of the battery cells, the connecting piece may need to adopt a special shape, bending angle or connection method to ensure that each battery cell can be stably and reliably connected. At the same time, there are many ways to connect the connecting piece, and the battery cells can be connected in parallel or in series.

[0043] In addition, by adjusting the shape and size of the fixing hole 1023, it can adapt to different types and specifications of battery cells, showing good flexibility and versatility. At the same time, this design has a compact structure and occupies little space, which helps to maximize the capacity and energy density of the battery cells in a limited equipment space. This is of great significance for improving the application performance of battery cells in various types of equipment. The installation and disassembly actions of the utility model structure will not damage the structure body. When an abnormality occurs in the production process, the rework operation is simple, and the entire set of materials does not need to be scrapped.

[0044] In a specific embodiment of the present application, the fixing hole 1023 is provided with a first hole position 10231 and a second hole position 10232, and the first hole position 10231 and the second hole position 10232 are connected. Through the connection design of the first hole position 10231 and the second hole position 10232, the mounting column 1022 passes through the first hole position 10231 and is pulled down and fixed to the second hole position 10232. The appropriate installation direction can also be selected according to actual needs and spatial layout. Since the first hole position 10231 and the second hole position 10232 are connected, the length of the mounting column 1022 can vary within a certain range, thereby adapting to mounting columns 1022 of different lengths and diameters. This design improves the compatibility between the connecting piece 1021 and the mounting column 1022, so that the same connecting piece 1021 can adapt to more mounting columns 1022 of different specifications, reducing inventory costs and replacement costs. The connection design of the first hole position 10231 and the second hole position 10232 can increase the structural stability of the connecting piece 1021. When the mounting post 1022 passes through the connecting hole, it forms multiple points of contact with the connecting piece 1021, thereby improving the connection strength and stability between the connecting piece 1021 and the mounting post 1022. This design helps to reduce the possibility of loosening or falling off of the connecting piece 1021 during use.

[0045] Furthermore, the second hole is larger in area than the first hole, and the larger second hole can more easily allow the mounting post to be inserted, especially during manual or automated assembly. The mounting post can first be easily positioned through the second hole and then further manipulated to the final position. In the actual manufacturing process, due to tolerances, the dimensions of the battery cell and the connecting piece may deviate. The larger area of ​​the second hole can accommodate these tolerances, ensuring that the mounting post can be smoothly passed through and fixed.

[0046] Further, such as Figure 2As shown, the maximum width of the second hole position 10232 in the third direction is greater than the maximum width of the first hole position 10231 in the third direction. Width refers to the spatial range occupied by an object. In this specification, width is a functional concept, which refers to the ability to accommodate objects of a specific size or shape. This design facilitates the connection piece 1021 to be moved vertically downward after being inserted into the mounting column 1022, so that the connection piece 1021 is hung on the mounting column 1022. This hanging method can effectively prevent the connection piece 1021 from accidentally falling off during the installation process, thereby improving the reliability of the installation. At the same time, it also limits the moving distance of the connection piece 1021 in the horizontal direction. This limiting effect can effectively prevent the connection piece 1021 from horizontal displacement after installation, thereby ensuring a stable connection between the connection piece 1021 and the mounting column 1022. In other embodiments, the width of the second hole position can be designed to change gradually, gradually transitioning from a larger width at the entrance to a smaller width at the junction with the first hole position. This design facilitates the insertion of the mounting column and ensures the stability of the connection. The edge of the hole can be designed to be flexible, with a certain elasticity and deformation ability. At this time, the width of the hole is the width after deformation during use. This design of the hole can adapt to the shape and size changes of the mounting column, improve the flexibility and success rate of installation. In addition, the width of the hole can be adjusted within a certain range. In this way, it can be adjusted according to different mounting column sizes to achieve a more universal connection solution. The width at this time is the width during normal use, and the width is not uniquely fixed.

[0047] In a specific embodiment of the present application, the first hole position 10231 is a rectangular hole, and the second hole position 10232 is a circular hole. The rectangular hole and the circular hole are adapted to the mounting posts 1022 of different shapes respectively. If the mounting post 1022 on the module housing 1013 is of a circular cross-section, the circular hole will provide a more precise fit and higher installation efficiency. On the contrary, if the mounting post 1022 has a rectangular or rectangular-like cross-section, the rectangular hole will better adapt to this shape and ensure a stable connection. If there is a slight deviation in the position or direction of the mounting post 1022, the circular hole can provide a certain tolerance, making it easier to insert the mounting post 1022. The rectangular hole provides clear positioning to ensure the accurate position of the connecting piece 1021 after installation. In addition, the design of the rectangular hole usually increases the thickness of the material around the hole, which can enhance the strength of the connecting piece 1021 in this area. Although the circular hole does not increase the local strength, its circular structure can evenly disperse stress and reduce stress concentration. In some other embodiments, the holes may be designed to be oval holes, polygonal holes (such as triangles, hexagons, etc.), slot holes, and other irregularly shaped holes, depending on factors such as the actual application scenario, the shape and size of the mounting post 1022, the process requirements for manufacturing and assembly, and the performance requirements of the connecting piece 1021. Different hole shapes may be selected.

[0048] Furthermore, the battery cell is provided with a detection point, and the fixing hole can expose all or part of the detection point. In the specific embodiment of the present description, the area of ​​the second hole position 10232 is larger than the detection point on the battery cell lead-out sheet, so that after the connecting sheet 1021 is installed, the second hole position 10232 can expose all of the detection points. The detection point is used as a reference point for welding CCD photography, which can accurately identify the position of the lead-out sheet before welding, and the connecting sheet can be welded once after installation, thereby improving the welding accuracy. In other embodiments where detection is performed based on color, etc., welding can be achieved by exposing part of the detection point in the fixing hole.

[0049] In a specific embodiment of the present application, the mounting column 1022 is provided with a column head structure 10221 and a column tail structure 10222. The cross section of the column head structure 10221 in the second direction is the same shape as the second hole position 10232, and the cross section of the column tail structure 10222 in the second direction is the same shape as the first hole position 10231. First, ensure that the hole position of the connecting piece 1021 is clean and free of impurities or obstacles so that the mounting column 1022 can be smoothly inserted. Align the column head structure 10221 of the mounting column 1022 with the second hole position 10232. Since the cross-sectional shapes of the two are the same, precise alignment can be easily achieved. Gently insert the mounting column 1022 into the second hole position 10232 until the column head structure 10221 completely passes through the circular hole. Continue to insert the mounting column 1022 until the column tail structure 10222 reaches the first hole position 10231. Since the cross-sectional shapes match, the column tail structure 10222 will naturally slide into the first hole position 10231. Make sure that the mounting post 1022 is fully inserted and there is no gap or looseness between the connecting piece 1021 and the mounting post 1022. Perform necessary checks to ensure that the installation is firm and reliable. Because the column head structure 10221 and the column tail structure 1022 of the mounting post 1022 match the hole shape of the connecting piece 1021, more precise alignment can be achieved and installation errors can be reduced. This design enables the mounting post 1022 to be smoothly inserted into the hole, reducing the adjustment and correction work during installation and improving installation efficiency. The matching shape can provide better support and fixation between the mounting post 1022 and the connecting piece 1021, enhancing the stability and reliability of the connection. Because the installation process is more precise and smooth, the risk of damage to the connecting piece 1021 or the mounting post 1022 due to improper installation is reduced. By ensuring the precise installation of each component, the overall performance and safety of the entire battery cell or structure can be improved.

[0050] Furthermore, the cross-sectional area of ​​the column head structure perpendicular to the second direction is S1, the cross-sectional area of ​​the column tail structure perpendicular to the second direction is S2, the area of ​​the second hole is S3, and S1, S2 and S3 satisfy: S1<S1≤S3. In a specific embodiment, ensure that the hole of the connecting piece 1021 is clean and free of impurities or obstacles so that the mounting column 1022 can be smoothly inserted. Align the column head structure 10221 of the mounting column 1022 with the second hole 10232. Since S2<S1≤S3, precise alignment can be easily achieved. Insert the mounting column 1022 into the second hole 10232 until the column head structure 10221 completely passes through the second hole 10232. At this time, the connection piece will slide down due to the pull-down or gravity. Along the first direction, the maximum width of the column head structure is L1, the maximum width of the column tail structure is L2, and the maximum width of the first hole is L3. L1, L2 and L3 satisfy: L2≤L3<L1. Since L2≤L1, the column tail structure 10222 slides into the first hole 10231, and the column head structure 10221 cannot enter the first hole 10231 because L3<L1. Ensure that the mounting column 1022 is fully inserted and there is no gap or looseness between the connection piece 1021 and the mounting column 1022. Perform necessary inspections to ensure that the installation is firm and reliable. Since the column head structure 10221 and the column tail structure 10222 of the mounting column 1022 match the hole size of the connecting piece 1021, more precise alignment can be achieved to reduce installation errors. This design enables the mounting column 1022 to be smoothly inserted into the hole, reduces the adjustment and correction work during installation, and improves installation efficiency. Reasonable size can provide better support and fixation between the mounting column 1022 and the connecting piece 1021, and enhance the stability and reliability of the connection. Since the installation process is more precise and smooth, the risk of damage to the connecting piece 1021 or the mounting column 1022 due to improper installation is reduced. By ensuring the precise installation of each component, the overall performance and safety of the entire battery cell or structure can be improved.

[0051] In a specific embodiment of the present application, the column head structure 10221 is provided with a chamfer. The chamfer forms a slope at the edge of the column head structure 10221, where the edge refers to the outer boundary or contour line of the column head structure. This helps to guide the mounting column 1022 to smoothly enter the hole of the connecting piece 1021 during the installation process. Especially when manually installed or installed in a limited space, the chamfer can effectively reduce the resistance during insertion and make the installation smoother. The chamfer design can remove the sharp part of the edge of the column head structure 10221, thereby reducing the risk of stress concentration. During assembly or use, sharp edges may cause stress concentration and increase the possibility of damage to the connecting piece 1021 or the mounting column 1022. By chamfering, stress can be dispersed and the durability of the structure can be improved. During the installation process, the chamfer can play a buffering role to protect the mounting column 1022 and the connecting piece 1021 from damage caused by collision or scratching. This helps to maintain the integrity and appearance quality of the mounting column 1022 and the connecting piece 1021.

[0052] The mounting post is integrally formed with the battery cell. Furthermore, the mounting post can be integrally formed with the battery cell housing to enhance the overall structural strength of the battery pack. In addition, it can also be integrally formed with the internal support structure of the battery cell. In a specific embodiment of the present application, the mounting post 1022 is integrally formed with the shell 1013. For the shell 1013 of plastic material, the mounting post 1022 and the shell 1013 can be integrally formed by injection molding. First of all, this design can enhance the integrity and stability of the product. Since the mounting post 1022 and the shell 1013 are manufactured as a whole, the connection between them is more secure and not prone to loosening or falling off. This helps to improve the durability and safety of the product. The one-piece design can simplify the production process. In the traditional production method, the mounting post 1022 and the shell 1013 may need to be manufactured separately and then assembled. The one-piece design can complete the manufacture of the entire product in one processing process, reducing the production links and assembly workload, and improving production efficiency. The one-piece design also helps to reduce production costs. Since the material waste and labor costs in the production process are effectively controlled, more economical and affordable products can be produced, improving the market competitiveness of the products. In other embodiments, the mounting post may also be connected to other parts of the battery cell.

[0053] In the specific embodiments of the present application, Figure 1 and Figure 2As shown, the connecting piece 1021 is provided with a raised structure. The raised structure can increase the elasticity of the connecting piece 1021 to a certain extent, which means that the connecting piece 1021 can have a certain deformation space when subjected to external force, thereby reducing the risk of breakage or damage caused by external force. It can also make the stress of the connecting piece 1021 more evenly dispersed when it is subjected to force, avoiding local damage caused by stress concentration. In addition, the raised structure allows the connecting piece 1021 to adjust its shape to a certain extent to adapt to battery cells of different sizes and specifications. This flexibility allows the same connecting piece 1021 to be applied to a variety of different battery cells, improving the versatility and applicability of the connecting piece 1021.

[0054] The protruding structure protrudes along the second direction and is used to connect the adjacent battery cells. The protruding structure is extended along the third direction. In other embodiments, in addition to the strip-shaped protrusions extending along the third direction, the protruding structure can also be designed as a strip-shaped structure of other shapes, such as a wavy shape, a sawtooth shape, etc., to increase the friction or contact area with the battery cell. In addition, the protruding structure can form a mesh or honeycomb structure to increase the overall rigidity of the connecting piece and the contact stability with the battery cell; the protruding structure can also be interwoven or staggered in multiple directions to provide a more comprehensive connection and support, and can be designed to be oblique or inclined to adapt to the specific arrangement or space limitation of the battery cell while ensuring the stability of the connection. In certain cases, the protruding structure can be designed as a curved surface shape to better fit the curve or curvature of the battery cell and improve the fit and stability of the connection.

[0055] During the installation process, the connecting piece 1021 needs to be fixed to the mounting column 1022. If the connecting piece 1021 does not have sufficient ductility, stress concentration may occur during the fixing process, causing damage to the connecting piece 1021. The design of the raised structure can help absorb and disperse this part of the stress and protect the connecting piece 1021 from damage. The raised structure also makes the connecting piece 1021 more flexible during assembly and can adapt to more application scenarios. In addition, the design of the raised structure can make the connecting piece 1021 easier to operate during installation and disassembly. For example, during installation, the raised structure can be used as a positioning point to help the operator quickly and accurately install the connecting piece 1021 to the correct position; during disassembly, the raised structure can also be used as a lever point for disassembly, making it convenient for the operator to apply force for disassembly.

[0056] In a specific embodiment of the present application, appropriate materials, such as high-strength, corrosion-resistant metals or plastics, are selected to make the outer shell and internal support structure of the battery pack. These materials need to have good mechanical properties and chemical stability to ensure that the battery pack can withstand various environmental and load conditions during use. The outer shell and internal components of the battery pack are made by injection molding and other processes. At this stage, the accuracy and quality of each component need to be ensured to ensure the overall performance and safety of the battery pack. Install the battery cell connecting piece 1021 inside the battery pack. This step requires ensuring that the position of the fixed structure is accurate and the installation is firm so that the battery cell can be effectively fixed to prevent it from shaking or damage during transportation and use. Place the battery cell inside the battery pack and fix it with the connecting piece 1021. In this process, it is necessary to ensure that the connection between the battery cell and the connecting piece is tight and stable to ensure the stability and safety of the battery cell in the battery pack. After the assembly of the battery pack is completed, quality inspection and testing are carried out to ensure the overall performance and safety of the battery pack. This includes checking the position and fixation of the battery cell, testing the electrical performance and safety performance of the battery pack, etc.

[0057] According to the second aspect of the utility model, there is also provided an electric system, which includes the above-mentioned battery pack. The connecting pieces in the battery pack can connect the battery cells together stably and reliably, ensuring the stable transmission of current. This structure not only simplifies the installation process and improves work efficiency, but also greatly enhances the stability and safety of the electric system. In some electric systems such as automobiles, the battery pack is the only source of power, and its stability and reliability are directly related to the safety performance of the vehicle. By ensuring a stable connection between the battery cells, the battery pack can maintain stable power output under various driving conditions, including high-speed driving, sudden braking, bumpy roads, etc., thereby ensuring the safe driving of the vehicle.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: The battery pack comprises: A plurality of battery cells, wherein the plurality of battery cells are arranged along a first direction; A connecting piece, the connecting piece connects two battery cells, and the connecting piece has a fixing hole; A mounting post is disposed in the fixing hole and connected to the battery cell, and a gap is provided between the mounting post and the fixing hole, wherein the gap is suitable for the mounting post to move in the fixing hole.

2. The battery pack according to claim 1, characterized in that: The fixing hole includes a first hole position and a second hole position, and the first hole position is connected to the second hole position.

3. The battery pack according to claim 2, characterized in that: The area of ​​the second hole is larger than the area of ​​the first hole.

4. The battery pack according to claim 2, characterized in that: In the first direction, the maximum width of the second hole is greater than the maximum width of the first hole.

5. The battery pack according to any one of claims 1 to 4, characterized in that: The battery core is provided with detection points, and the fixing holes are used to make at least part of the detection points visible.

6. The battery pack according to claim 2, characterized in that: The mounting column includes a column head structure and a column tail structure, the cross-sectional area of ​​the column head structure perpendicular to a second direction is larger than the cross-sectional area of ​​the column tail structure perpendicular to the second direction, and the second direction is the same as the direction in which the mounting column protrudes from the battery cell.

7. The battery pack according to claim 6, characterized in that: Along the first direction, the maximum width of the column head structure is L1, the maximum width of the column tail structure is L2, and the maximum width of the first hole position is L3. L1, L2 and L3 satisfy: L2≤L3<L1.

8. The battery pack according to claim 6, characterized in that: The cross-sectional area of ​​the column head structure perpendicular to the second direction is S1, the cross-sectional area of ​​the column tail structure perpendicular to the second direction is S2, and the second hole area is S3. S1, S2 and S3 satisfy: S1<S1≤S3.

9. The battery pack according to claim 1, characterized in that: The mounting post is integrally formed with the battery core.

10. The battery pack according to claim 1, characterized in that: The connecting sheet is provided with a protruding structure, the protruding structure protrudes along the second direction for connecting adjacent battery cells, and the protruding structure extends along the third direction. The second direction is the same as a direction in which the mounting post protrudes from the battery cell, and the third direction is perpendicular to the first direction and the second direction respectively.

11. An electricity system, characterized in that: The power system comprises the battery pack according to any one of claims 1-10.

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