Battery pack and vehicle

Abstract

The present invention relates to a battery pack and a vehicle, wherein the battery pack comprises a box assembly (1), a battery cell (2), a restraining component (3) and an outer cover (4), wherein the box assembly (1) comprises a box (11) and a fixing beam (12), wherein the fixing beam (12) is fixed in the box (11); the battery cell (2) is arranged in the box (11); the restraining component (3) covers the battery cell (2) and is fixed to the fixing beam (12); the outer cover (4) is arranged on a side of the restraining component (3) away from the box (11), and closes the open end of the box (11). By arranging the restraining component and fixing it to the fixing beam, the battery pack can provide a stable and effective pressing force to the battery cell when it expands, thereby reducing the expansion deformation degree of the battery cell; and, since the restraining component is arranged, the deformation of the outer cover can be reduced, thereby improving the sealing performance of the battery pack.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery pack and a vehicle. Background Art

[0002] In recent years, rechargeable batteries have been widely used to provide power for vehicles. Multiple rechargeable batteries are connected in series, parallel or hybrid to achieve a larger capacity or power.

[0003] In actual use, it was found that the battery pack cover is large and has poor rigidity, and the battery cells expand during the charge and discharge process, causing the battery pack cover to deform significantly. The deformation of the battery pack cover will reduce the sealing performance of the cover and the box, causing external water vapor to enter the battery pack and cause a short circuit problem; and because the deformation of the battery pack cover may hit other parts of the vehicle, when the battery pack needs to be removed from the vehicle for maintenance, it will be difficult to remove and reinstall it. Summary of the invention

[0004] Embodiments of the present invention provide a battery pack and a vehicle, which can improve the sealing performance of the battery pack.

[0005] According to one aspect of the present invention, there is provided a battery pack, comprising:

[0006] The box assembly comprises a box and a fixed beam, wherein the fixed beam is fixed in the box;

[0007] A battery cell is arranged in the box;

[0008] a restraining member covering the battery cell and fixed to the fixing beam; and

[0009] The outer cover is arranged on a side of the restraining component away from the box body and closes the open end of the box body.

[0010] In some embodiments, the fixed beam divides the box into multiple accommodating cavities, the battery pack includes multiple battery cells, and the multiple battery cells are divided into multiple groups in a plane perpendicular to the height direction, each group of battery cells has at least two battery cells and are respectively arranged in different accommodating cavities.

[0011] In some embodiments, the battery pack includes a plurality of fixing beams, and each group of battery cells is provided with fixing beams on both sides along the grouping direction.

[0012] In some embodiments, the plurality of battery cells are grouped along the length direction of the battery pack, and the fixing beams extend along the width direction of the battery pack; and / or

[0013] A plurality of battery cells are grouped along a width direction of the battery pack, and a fixing beam extends along a length direction of the battery pack.

[0014] In some embodiments, the battery pack includes a plurality of restraining components, each restraining component covers a different group of battery cells.

[0015] In some embodiments, the restraining component comprises:

[0016] A limiting portion covering the battery cells of the corresponding group; and

[0017] The two mounting parts are respectively connected to the two sides of the limiting part along the battery monomer grouping direction, and the two mounting parts are respectively fixed to the fixing beams on the two sides of the battery monomers of the corresponding group.

[0018] In some embodiments, the limiting portion as a whole protrudes relative to the mounting portion in a direction away from the battery cell.

[0019] In some embodiments, a fixed beam is provided between two adjacent groups of battery cells, and two adjacent mounting portions fixed to the fixed beam each include multiple mounting blocks, the multiple mounting blocks are arranged at intervals along the extension direction of the fixed beam, and the multiple mounting blocks corresponding to the two adjacent mounting portions are arranged alternately.

[0020] In some embodiments, the restraint component is a split structure and covers at least a portion of the surface of the corresponding battery cell.

[0021] In some embodiments, there is a preset gap between the inner surface of the outer cover and the outer surface of the restraint component. Preferably, the preset gap ranges from 2 mm to 100 mm.

[0022] In some embodiments, the battery pack further comprises:

[0023] The pressure strip and the fastener, the mounting portion is arranged between the pressure strip and the fixed beam, and the fastener passes through the pressure strip and the mounting portion and is fixed to the fixed beam to fix the mounting portion on the fixed beam.

[0024] In some embodiments, the battery pack further includes a seal, which is disposed between the outer cover and the box body to close the open end of the box body.

[0025] In some embodiments, an adhesive layer is provided between the bottommost battery cell and the bottom surface of the box body; and / or,

[0026] An adhesive layer is provided between two adjacent battery cells in each group of battery cells; and / or,

[0027] An adhesive layer is provided between the restraining component and the topmost battery cell.

[0028] In some embodiments, the battery cell comprises:

[0029] a housing; and

[0030] An electrode assembly disposed in the housing, the electrode assembly comprising a first pole piece, a second pole piece, and a diaphragm disposed between the first pole piece and the second pole piece;

[0031] Wherein, the electrode assembly is of a wound structure and is flat, and the outer surface of the electrode assembly includes two flat surfaces, and the two flat surfaces are arranged opposite to each other in the height direction; or,

[0032] The electrode assembly is a laminated structure, with the first pole piece and the second pole piece stacked in a height direction.

[0033] According to another aspect of the present invention, there is provided a vehicle, comprising:

[0034] The vehicle body; and

[0035] The battery pack of the above embodiment is arranged on the vehicle body.

[0036] Based on the above technical solution, a battery pack according to an embodiment of the present invention is provided with a restraining component and fixed to a fixed beam. When a battery cell expands, a stable and effective pressing force can be provided to the battery cell, thereby reducing the degree of expansion deformation of the battery cell. Moreover, since the restraining component is provided, the deformation of the outer cover can be reduced, thereby improving the sealing of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0038] Figure 1 It is an exploded schematic diagram of an implementation of the battery pack of the present invention;

[0039] Figure 2 for Figure 1 The schematic diagram of the structure of the battery pack with the outer cover opened;

[0040] Figure 3 for Figure 1 A cross-sectional view of the battery pack shown along the xz plane;

[0041] Figure 4 for Figure 2 A partial cross-sectional view of the internal structure of the battery pack;

[0042] Figure 5 A schematic diagram of the structure of a pressure strip and a seal in a battery pack;

[0043] Figure 6 is an exploded view of another embodiment of a battery pack of the present invention;

[0044] Figure 7 for Figure 6The schematic diagram of the internal structure of the battery pack after the outer cover is opened;

[0045] Figure 8 is an exploded schematic diagram of an embodiment of a battery cell in a battery pack;

[0046] Fig. 9 The battery cell adopts a wound electrode assembly along the Figure 8 Sectional view of the xz plane;

[0047] Fig.10 The battery cell adopts a laminated electrode assembly along the Figure 8 Cross-sectional view in the xz plane.

[0048] Description of Reference Numerals

[0049] 1. Box assembly; 11. Box; 111. First flange; 12. Fixed beam; 121. First mounting hole; 13. Accommodating cavity;

[0050] 2. Battery cell; 20A, first group of battery cells; 20B, second group of battery cells; 21, housing; 22, electrode assembly; 221, first pole piece; 222, second pole piece; 223, diaphragm; 224, flat surface; 23, adapter; 24, cover plate assembly; 241, cover plate; 242, first electrode terminal; 243, second electrode terminal;

[0051] 3. Constraint component; 3A. First constraint component; 3B. Second constraint component; 31. Position limiting portion; 32. Mounting portion; 321. Mounting block; 322. Second mounting hole;

[0052] 4. outer cover; 41. second flange;

[0053] 5. Fasteners; 6. Pressure strips; 7. Seals. DETAILED DESCRIPTION

[0054] The present invention is described in detail below. In the following paragraphs, different aspects of the embodiments are defined in more detail. Each aspect so defined can be combined with any other aspect or aspects, unless explicitly stated not to be combined. In particular, any feature that is considered to be preferred or advantageous can be combined with one or more other features that are considered to be preferred or advantageous.

[0055] The terms "first", "second" and the like appearing in the present invention are only for the convenience of description to distinguish different components with the same name, and do not indicate a sequence or a primary and secondary relationship.

[0056] In addition, when an element is referred to as being "on" another element, the element may be directly on the other element, or may be indirectly on the other element with one or more intermediate elements interposed therebetween. In addition, when an element is referred to as being "connected to" another element, the element may be directly connected to the other element, or may be indirectly connected to the other element with one or more intermediate elements interposed therebetween. Hereinafter, the same reference numerals represent the same elements.

[0057] The term "plurality" used in the present invention refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two), and "multiple roots" refers to more than two roots (including two).

[0058] In order to clearly describe various directions in the following embodiments, for example Figure 1 The coordinate system in defines the various directions of the battery pack. The x direction represents the length direction of the battery pack; the y direction represents the width direction of the battery pack; the z direction is perpendicular to the plane formed by the x and y directions, representing the height direction of the battery pack. When the battery pack is installed on the vehicle, the height direction of the battery pack is parallel to the vertical direction. The vertical direction mentioned here allows a certain angle deviation relative to the theoretical vertical direction. Based on this orientation definition, "up", "down", "top" and "bottom" are used, all relative to the height direction.

[0059] In some embodiments, the present invention provides a vehicle, which includes a vehicle body and a battery pack, and the battery pack is arranged in the vehicle body. The vehicle is a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle. A drive motor is arranged in the vehicle body, the drive motor is electrically connected to the battery pack, and the battery pack provides electrical energy. The drive motor is connected to the wheels on the vehicle body through a transmission mechanism, thereby driving the vehicle to move forward. Preferably, the battery pack can be horizontally arranged at the bottom of the vehicle body, and can be installed in a top-mounted and / or bottom-supported manner.

[0060] Figures 1 to 5 The battery pack 100 is a schematic structural diagram of an embodiment of the present invention. The battery pack 100 comprises: a box assembly 1, a battery cell 2, a restraining component 3 and an outer cover 4.

[0061] The box assembly 1 includes a box 11 and a fixed beam 12. The box 11 has an open end. The fixed beam 12 is fixed in the box 11. For example, the fixed beam 12 can be fixed on the inner bottom surface or the side wall of the box 11. The battery cells 2 are arranged in the box 11. The restraining component 3 covers the battery cells 2 and can contact or retain a preset gap with the topmost battery cells 2. The restraining component 3 is fixed to the fixed beam 12 and is configured to limit the expansion of the battery cells 2.

[0062] The outer cover 4 is arranged on the side of the restraining component 3 away from the box body 11, and is buckled on the open end of the box body 11 along the height direction of the battery pack to close the open end of the box body 11. The closing here means that the outer cover 4 is sealed with the box body 11, which can prevent external liquid and water vapor from entering the battery pack, thereby improving the safety performance of the battery pack.

[0063] This embodiment of the present invention provides a restraining component 3 and fixes it to the fixing beam 12. When the battery cell 2 expands, a stable and effective pressing force can be provided to the battery cell 2, thereby reducing the expansion deformation of the battery cell 2. Moreover, since the restraining component 3 is provided, the deformation of the outer cover 4 can be reduced, and the sealing of the battery pack can be improved. Moreover, the battery pack reduces the deformation of the outer cover 4 by providing the restraining component 3. When the battery pack is used in a vehicle, it can still be smoothly disassembled and assembled at the original installation position after long-term use, which can reduce the difficulty of repairing the battery pack and prevent the deformation of the battery pack from applying external force to the installation structure on the vehicle.

[0064] like Figure 1 As shown, the fixed beam 12 divides the box body 11 into a plurality of accommodating cavities 13, the battery pack includes a plurality of battery cells 2, and each battery cell 2 is divided into a plurality of groups in a plane perpendicular to the height direction, each group of battery cells 2 has at least two battery cells 2 and are respectively arranged in different accommodating cavities 13. Preferably, the size of each accommodating cavity 13 is adapted to the overall outer dimensions of the corresponding group of battery cells 2.

[0065] This embodiment arranges the battery cells 2 in groups, and fixes the restraining components 3 to the fixing beams 12 for grouping the battery cells 2, which is equivalent to increasing the fixing points between the restraining components 3 and the box 11, thereby reducing the span between the fixing points and improving the deformation resistance of the restraining components 3. Compared with the traditional solution of restraining all the battery cells as a whole through the cover, this embodiment applies fixed constraints to the periphery of each group of battery cells 2 separately. When the battery cells expand, the restraining components 3 are not easy to deform, and can further provide a stable pressing force on the battery cells 2 to prevent the size of the battery pack from increasing in the height direction. It is also not easy to squeeze the outer cover 4 due to the deformation of the restraining components 3, which can improve the service life of the battery pack.

[0066] Moreover, the battery cells 2 are grouped together. When some of the battery cells 2 generate a lot of heat and thermal runaway occurs, the heat can be delayed from spreading to other groups of battery cells 2, thereby improving the safety of the battery pack. Even if some of the battery cells 2 cannot be used normally, the battery pack can be used at a reduced power.

[0067] like Figure 1As shown, the battery pack includes a plurality of fixing beams 12, and each group of battery cells 2 is provided with fixing beams 12 on both sides along the grouping direction. In addition to being provided in the channel formed by the adjacent groups of battery cells 2, each fixing beam 12 is also provided on one side of the outermost group of battery cells 2 close to the inner wall of the box body 11. The fixing beams 12 can be designed as a continuous structure in their own extension direction, or as a segmented structure.

[0068] This structure can fix each group of battery cells 2 on both sides along the grouping direction to apply a more stable restraining force to the battery cells 2, thereby improving the restraining effect on the group of battery cells 2, further limiting the expansion of the battery cells, and increasing the service life of the battery pack.

[0069] For example, each battery cell 2 is stacked in one or more layers along the height direction, for example Figure 1 Each battery cell 2 is divided into multiple columns, and each column of battery cells 2 needs to be connected in parallel or in series through a bus bar, so a gap is set between two adjacent columns of battery cells 2.

[0070] Preferably, the distance between adjacent fixed beams 12 is configured to accommodate at most two rows of battery cells 2. This can minimize the span between adjacent fixed beams 12, so that the constraint component 3 and the fixed beam 12 have more fixing points, which can improve the deformation resistance of the constraint component 3 and improve the reliability of the constraint of each group of battery cells 2.

[0071] like Figure 2 As shown in the front view, three fixing beams 12 extending along the width direction of the battery pack are provided in the box body 11, which can be fixed on the inner bottom surface of the box body 11. The middle fixing beam 12 is located between the two groups of battery cells 2, and the fixing beams 12 on both sides are arranged close to the inner side wall of the box body 11, dividing the space in the box body 11 into two accommodating chambers 13, one of which is Figure 1 The first battery cell group 20A is placed in the left side of the middle part, and the first battery cell group 20A includes a row of battery cells 2; the other accommodating cavity 13 ( Figure 1 The second group of battery cells 20B is placed on the right side of the center of the battery cell 20B, and the second group of battery cells 20B includes two rows of battery cells 2 arranged side by side in the length direction. Each row of battery cells 2 includes a plurality of battery cells 2 arranged side by side in the width direction, and the sides of two adjacent battery cells 2 are in contact, and each battery cell 2 is stacked in two layers in the height direction.

[0072] The extension direction of each fixing beam 12 is perpendicular to the grouping direction of each battery cell 2, so as to make the internal structure of the battery pack more compact. Figure 1As shown, multiple battery cells 2 are grouped along the length direction of the battery pack, and the fixed beam 12 extends along the width direction of the battery pack. This arrangement is conducive to dividing each battery cell 2 into more groups to increase the fixing points of the restraint component 3 and the box body 11, and can also reduce the overall aspect ratio of each group of battery cells 2, so that the restraint stiffness of the restraint component 3 on each group of battery cells 2 in the length and width directions is balanced, thereby improving the restraint reliability.

[0073] Optionally, multiple battery cells 2 are grouped along the width direction of the battery pack, and the fixing beams 12 extend along the length direction of the battery pack. Alternatively, multiple battery cells 2 can also be grouped along the length direction and the width direction of the battery pack at the same time, and each fixing beam 12 forms a grid structure.

[0074] For the specific structure of the fixed beam 12, a solid fixed beam or a hollow fixed beam can be used, and its cross-section can be rectangular, trapezoidal or C-shaped, etc., and its upper surface can be set to a plane so that the restraint component can be fixed on the upper surface of the fixed beam 12. Optionally, the restraint component 3 can also be fixed on the side of the fixed beam 12.

[0075] Among them, Figure 8 As shown in the exploded schematic diagram, each battery cell 2 includes: a shell 21 and an electrode assembly 22 disposed in the shell 21, and the shell 21 may have a hexahedral shape or other shapes and has an opening. The electrode assembly 22 is accommodated in the shell 21. The opening of the shell 21 is covered with a cover assembly 24. The cover assembly 24 includes a cover 241 and two electrode terminals disposed on the cover, and the two electrode terminals are a first electrode terminal 242 and a second electrode terminal 243. Among them, the first electrode terminal 242 can be a positive electrode terminal, and the second electrode terminal 243 is a negative electrode terminal. In other embodiments, the first electrode terminal 242 can also be a negative electrode terminal, and the second electrode terminal 243 is a positive electrode terminal. A transfer plate 23 is provided between the cover assembly 24 and the electrode assembly 22, and the pole ear of the electrode assembly 22 is electrically connected to the electrode terminal on the cover 241 through the transfer plate 23. In this embodiment, there are two transfer plates 23, namely, a positive transfer plate and a negative transfer plate.

[0076] like Figure 8 As shown, two electrode assemblies 22 are disposed in the housing 21, and the two electrode assemblies 22 are stacked along the height direction (z direction) of the battery cell 2, wherein the height direction of the battery cell 2 is consistent with the height direction of the battery pack. Of course, in other embodiments, one electrode assembly 22 may also be disposed in the housing 21, or more than three electrode assemblies 22 may be disposed in the housing 21. Multiple electrode assemblies 22 are stacked along the height direction (z direction) of the battery cell 2.

[0077] like Fig. 9 and Fig.10As shown, the electrode assembly 22 includes a first electrode sheet 221, a second electrode sheet 222, and a diaphragm 223 disposed between the first electrode sheet 221 and the second electrode sheet 222. The first electrode sheet 221 may be a positive electrode sheet, and the second electrode sheet 222 may be a negative electrode sheet. In other embodiments, the first electrode sheet 221 may also be a negative electrode sheet, and the second electrode sheet 222 may be a positive electrode sheet. The diaphragm 223 is an insulator between the first electrode sheet 221 and the second electrode sheet 222. The active material of the positive electrode sheet may be coated on the coating area of ​​the positive electrode sheet, and the active material of the negative electrode sheet may be coated on the coating area of ​​the negative electrode sheet. The portion extending from the coating area of ​​the positive electrode sheet serves as the positive electrode tab; the portion extending from the coating area of ​​the negative electrode sheet serves as the negative electrode tab. The positive electrode tab is connected to the positive electrode terminal on the cover assembly 24 through the positive electrode adapter, and similarly, the negative electrode tab is connected to the negative electrode terminal on the cover assembly 24 through the negative electrode adapter.

[0078] like Fig. 9 As shown, the electrode assembly 22 is a wound structure. Among them, the first pole piece 221, the diaphragm 223 and the second pole piece 222 are all strip structures. The first pole piece 221, the diaphragm 223 and the second pole piece 222 are stacked in sequence and wound more than two times to form the electrode assembly 22, and the electrode assembly 22 is flat. When the electrode assembly 22 is manufactured, the electrode assembly 22 can be directly wound into a flat shape, or it can be first wound into a hollow cylindrical structure and then flattened into a flat shape after winding. Fig. 9 2 is a schematic diagram of the outer contour of the electrode assembly 22. The outer surface of the electrode assembly 22 includes two flat surfaces 224, which are arranged opposite to each other along the height direction (z direction) of the battery cell 2. The electrode assembly 22 is generally a hexahedral structure, and the flat surface 224 is generally parallel to the winding axis and is the outer surface with the largest area. The flat surface 224 can be a relatively flat surface, and is not required to be a pure plane.

[0079] like Fig.10 As shown, the electrode assembly 22 is a laminated structure, that is, the electrode assembly 22 includes a plurality of first pole pieces 221 and a plurality of second pole pieces 222, and the diaphragm 223 is disposed between the first pole pieces 221 and the second pole pieces 222. The first pole pieces 221 and the second pole pieces 222 are stacked along the height direction (z direction) of the battery cell 2.

[0080] The electrode assembly 22 will inevitably expand along the thickness direction of the electrode during the charge and discharge process. The expansion of each electrode is superimposed, and the accumulated expansion in the height direction is greater than that in other directions. The embodiment of the present invention can constrain the direction in which the battery cell 2 expands the most by adding fixed points between the constraint component 3 and the box body 11, thereby preventing the battery pack from deforming and increasing the service life of the battery pack.

[0081] like Figure 3As shown, there is a preset gap L between the inner surface of the outer cover 4 and the outer surface of the restraining component 3. By reserving expansion space for the battery cell 2, the force of the restraining component 3 after deformation is prevented from being transmitted to the outer cover 4, forcing the outer cover 4 to deform; and even if the battery cell 2 expands and causes the restraining component 3 to deform and hit the outer cover 4, the outer cover 4 can further limit the deformation of the restraining component 3 and the expansion of the battery cell 2. Preferably, for battery packs of different sizes, the preset gap ranges from 2mm to 100mm.

[0082] like Figure 1 and Figure 2 As shown, the battery pack may include multiple restraining components 3, each restraining component 3 covers different groups of battery cells 2. This embodiment uses multiple restraining components 3 to restrain different groups of battery cells 2, and can independently apply fixed constraints to each group of battery cells 2, thereby reducing the coverage of the restraining components 3, improving their own rigidity and preventing deformation, so as to provide a stable and reliable restraining force. Moreover, when a certain group of battery cells 2 expands greatly and causes the corresponding restraining component 3 to deform, it can avoid affecting other groups of battery cells 2, thereby improving the working reliability and service life of the battery pack.

[0083] Specifically, each restraining component 3 includes: a limiting portion 31 and two mounting portions 32. The limiting portion 31 covers the battery cells 2 of the corresponding group; the two mounting portions 32 are connected to the two sides of the limiting portion 31 along the grouping direction of the battery cells 2, and are respectively fixed to the fixing beams 12 on the two sides of the grouping direction of the battery cells 2 of the corresponding group. The restraining component 3 can be formed by bending a flat plate.

[0084] like Figure 2 As shown, the limiting portion 31 completely covers the top surface of the corresponding group of battery cells 2, which can increase the restraining force on the battery cells 2 and improve the ability of the restraining component 3 to resist deformation.

[0085] This embodiment can separately constrain the battery cells 2 of each group by setting a plurality of independent constraint components 3. The constraints of each group of battery cells 2 are completely independent, and the disassembly and assembly of each constraint component 3 do not affect each other. Even when there are differences in the heights of the battery cells 2 of each group, the installation of the constraint component 3 will not be affected. If the expansion of the battery cells 2 of a certain group is large, it will only cause the corresponding constraint component 3 to deform, and the deformation stress will not be transmitted to other constraint components 3. Moreover, when a battery cell 2 of a certain group fails and needs to be opened for repair and replacement, only the corresponding constraint component 3 needs to be opened, and other constraint components 3 do not need to be disassembled.

[0086] like Figure 3As shown, the limiting portion 31 as a whole protrudes relative to the mounting portion 32 in a direction away from the battery cell 2. This structure can not only reduce the setting height of the fixing beam 12 and ensure the strength of the fixing beam 12, but also prevent the fastener 5 from protruding from the top surface of the limiting portion 31 when the mounting portion 32 and the fixing beam 12 are fixed by the fastener 5, thereby reducing the height of the battery pack.

[0087] like Figure 3 and Figure 4 As shown, a fixed beam 12 is provided between two adjacent groups of battery cells 2, and two adjacent mounting portions 32 fixed to the fixed beam 12 each include a plurality of mounting blocks 321, and the plurality of mounting blocks 321 are arranged at intervals along the extension direction of the fixed beam 12, and the plurality of mounting blocks 321 corresponding to the two adjacent mounting portions 32 are arranged alternately. For example, the mounting blocks 321 may be rectangular, trapezoidal or triangular in structure. This structure enables the restraining components 3 corresponding to two adjacent groups of battery cells 2 to be fixed by sharing a fixed beam 12, which can save space and improve the energy density of the battery pack. Optionally, two fixed beams 12 may also be provided between adjacent groups of battery cells 2, and each restraining component 3 is fixed to a fixed beam 12, respectively.

[0088] Specifically, Figure 1 As shown, in order to achieve the fixation of the outer cover 4 and the box body 11, a first flange 111 is provided around the opening end of the box body 11, and a second flange 41 is provided around the outer cover 4. The first flange 111 and the second flange 41 can be fixed by bonding or fastener connection. In order to achieve the fixation of the restraining component 3 and the fixed beam 12, a plurality of second mounting holes 322 are provided at intervals on the mounting portion 32 along the extension direction of the fixed beam 12, and a plurality of first mounting holes 121 are provided at intervals on the top of the fixed beam 12 along its own extension direction. The fastener 5 is passed through the second mounting holes 322 and the first mounting holes 121, so that the restraining component 3 and the fixed beam 12 can be fixed.

[0089] like Figure 5 As shown, the battery pack of the present invention may further include: a pressure strip 6, which is arranged between the mounting portion 32 and the fixed beam 12. The pressure strip 6 may be a long sheet structure, and a hole is provided on the pressure strip 6 to ensure that the fastener 5 passes through. During assembly, a pressure strip 6 of appropriate thickness may be selected to adjust the assembly gap. When the restraining component 3 and the fixed beam 12 are fixed by the fastener 5, an appropriate assembly gap may be maintained between the restraining component 3 and the battery cell 2, preventing the restraining component 3 from exerting a large pressing force on the battery cell 2, thereby increasing the service life of the battery pack.

[0090] Optionally, the pressure strip 6 may also be arranged between the fastener 5 and the top surface of the mounting portion 32. For example, when the fastener 5 is a screw, the pressure strip 6 is arranged between the screw head and the top surface of the mounting portion 32 to increase the reliability of the fastener 5 being fixed.

[0091] Still refer to Figure 5 In order to ensure the sealing of the internal space of the battery pack and prevent external liquid or water vapor from entering the battery pack to affect the working performance of the battery cell 2, the battery pack of the present invention may also include a seal 7, which is arranged between the outer cover 4 and the box body 11. The seal 7 may be a long sheet structure or a rectangular ring structure. The seal 7 is provided with a hole to ensure that the fastener 5 passes through. The seal may be made of materials such as silicone rubber. When the battery pack is used in a vehicle, the seal may also absorb the vibration transmitted to the battery pack during the operation of the vehicle.

[0092] Furthermore, in order to improve the reliability of fixing the battery cells 2 and prevent the battery cells 2 from shaking, an adhesive layer is provided between the bottommost battery cells 2 and the inner bottom surface of the box body 11; and / or an adhesive layer is provided between two adjacent battery cells 2 in each group of battery cells 2; and / or an adhesive layer is provided between the restraining component 3 and the topmost battery cell 2. For a battery pack with only a single layer of battery cells 2, the bottommost and topmost battery cells 2 are the same layer of battery cells 2.

[0093] Figure 6 and Figure 7 is a schematic diagram of the structure of another embodiment of the battery pack of the present invention, the battery pack 200 and Figures 1 to 4 The difference of the battery pack 100 shown is that the restraint component 3 can adopt a split structure and cover a part of the surface of the battery cell 2.

[0094] The restraining component 3 may be disposed in a split manner along the length direction and / or the width direction. The restraining component 3 adopts a split structure and covers at least a portion of the surface of the corresponding battery cell 2. Figure 6 As shown, the restraining component 3 for covering the first group of battery cells 20A includes a first restraining component 3A and a second restraining component 3B. The limiting parts 31 of the first restraining component 3A and the second restraining component 3B can be arranged at intervals along the length direction, and only cover part of the surface of the group of battery cells 2. The mounting part 32 of the first restraining component 3A extends continuously along the width direction, and the mounting part 32 of the second restraining component 3B includes a plurality of mounting blocks 321 arranged at intervals along the width direction. The restraining component 3 for covering the second group of battery cells 20B adopts an integral structure. Figure 7 It is a schematic diagram of fixing the first restraining component 3A and the second restraining component 3B to the fixed beam 12 by means of the fastener 5 .

[0095] The advantage of this embodiment is that, affected by the dimensional tolerance of each battery cell 2 and the accuracy of the stacking arrangement, the tops of each battery cell 2 in the same group may also have height differences. The use of a split restraint component 3 reduces the processing requirements for the height dimension of the side plate of the limiting portion 31 and is also easy to assemble; moreover, the split restraint component 3 can save materials; in addition, by partially covering the surface of the battery cell 2, it is beneficial to the heat dissipation of the battery cell 2.

[0096] On this basis, the temperature can be adjusted according to the working requirements of the battery pack. The box assembly 1 can also include a temperature control component. The temperature control component is arranged in the bottom area of ​​the box 11. The temperature control component is used to adjust the temperature of the battery cell 2 from the bottom. For example, in order to take away the heat generated by the battery cell 2 during operation, the battery cell 2 can be cooled; or when the battery pack is used in low temperature areas, the battery cell can be heated.

[0097] Each of the embodiments of the present invention covers the side and top of each group of battery cells 2 by providing a heat-conducting fixed beam 12 and a restraining component 3. While the temperature control component adjusts the temperature at the bottom of the box body 11, the temperature can be transmitted to the fixed beam 12 and the restraining component 3 in sequence, thereby changing the conduction path of the temperature control component for regulating the temperature of the battery cells 2, balancing the temperature distribution along the height direction in the accommodating cavity, reducing the temperature difference between the battery cells 2 in the upper and lower areas, and improving the temperature uniformity of each battery cell 2, thereby improving the consistency of the discharge depth.

[0098] The above is a detailed introduction to a battery pack and a vehicle provided by the present invention. Specific embodiments are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A battery pack, characterized in that: include: A box assembly (1) comprises a box (11) and a fixed beam (12), wherein the fixed beam (12) is fixed in the box (11); A battery cell (2) is arranged in the box (11); A restraining component (3) covers the battery cells (2) and is fixed to the fixing beam (12), the restraining component (3) comprising: a limiting portion (31) covering the battery cells (2) of the corresponding group; and two mounting portions (32) respectively connected to two sides of the limiting portion (31) along the grouping direction of the battery cells (2), the two mounting portions (32) respectively fixed to the fixing beam (12) on two sides of the battery cells (2) of the corresponding group; and An outer cover (4) is arranged on a side of the restraining component (3) away from the box body (11) and closes the open end of the box body (11); The fixing beam (12) divides the box body (11) into a plurality of accommodating cavities (13), the battery pack comprises a plurality of battery cells (2), and the plurality of battery cells (2) are divided into a plurality of groups in a plane perpendicular to the height direction, each group of battery cells (2) comprises at least two battery cells (2) and are respectively arranged in different accommodating cavities (13); A fixing beam (12) is provided between two adjacent groups of battery cells (2), and two adjacent mounting portions (32) fixed to the fixing beam (12) each comprise a plurality of mounting blocks (321), the plurality of mounting blocks (321) being arranged at intervals along the extension direction of the fixing beam (12), and the plurality of mounting blocks (321) corresponding to the two adjacent mounting portions (32) are arranged alternately.

2. The battery pack according to claim 1, characterized in that: The battery pack comprises a plurality of fixing beams (12), and each group of battery cells (2) is provided with fixing beams (12) on both sides along the grouping direction.

3. The battery pack according to claim 1, characterized in that: The plurality of battery cells (2) are grouped along the length direction of the battery pack, and the fixing beam (12) extends along the width direction of the battery pack; and / or The plurality of battery cells (2) are grouped along the width direction of the battery pack, and the fixing beam (12) extends along the length direction of the battery pack.

4. The battery pack according to any one of claims 1 to 3, characterized in that: It comprises a plurality of restraining components (3), each restraining component (3) covers a different group of battery cells (2), and the restraining component (3) is used to restrain the direction in which the expansion amount of the battery cells (2) is the largest.

5. The battery pack according to claim 1, characterized in that: The limiting portion (31) as a whole protrudes relative to the mounting portion (32) in a direction away from the battery cell (2).

6. The battery pack according to any one of claims 1 to 3, characterized in that: The restraining component (3) is a split structure and covers at least part of the surface of the corresponding battery cell (2).

7. The battery pack according to any one of claims 1 to 3, characterized in that: There is a preset gap (L) between the inner surface of the outer cover (4) and the outer surface of the restraining component (3).

8. The battery pack according to claim 7, characterized in that: The preset gap (L) ranges from 2 mm to 100 mm.

9. The battery pack according to claim 1, characterized in that: Also includes: A pressure strip (6) and a fastener (5), wherein the mounting portion (32) is arranged between the pressure strip (6) and the fixed beam (12), and the fastener (5) passes through the pressure strip (6) and the mounting portion (32) and is fixed to the fixed beam (12) so as to fix the mounting portion (32) on the fixed beam (12).

10. The battery pack according to claim 1, characterized in that: It also comprises a sealing member (7), wherein the sealing member (7) is arranged between the outer cover (4) and the box body (11) so as to seal the open end of the box body (11).

11. The battery pack according to any one of claims 1 to 3, characterized in that: An adhesive layer is provided between the battery cells (2) at the bottom layer and the inner bottom surface of the box body (11); and / or, An adhesive layer is provided between two adjacent battery cells (2) in each group of battery cells (2); and / or, An adhesive layer is provided between the restraining component (3) and the battery cell (2) at the top layer.

12. The battery pack according to any one of claims 1 to 3, characterized in that: The battery cell (2) comprises: a housing (21); and An electrode assembly (22) disposed in the housing (21), the electrode assembly (22) comprising a first pole piece (221), a second pole piece (222), and a diaphragm (223) disposed between the first pole piece (221) and the second pole piece (222); The electrode assembly (22) is of a wound structure and is flat, and the outer surface of the electrode assembly (22) comprises two flat surfaces (224), and the two flat surfaces (224) are arranged opposite to each other in a height direction; or, The electrode assembly (22) is a laminated structure, wherein the first pole piece (221) and the second pole piece (222) are stacked in a height direction.

13. A vehicle, characterized in that: include: Vehicle body; and The battery pack according to any one of claims 1 to 12, wherein the battery pack is disposed on the vehicle body.

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