Battery pack

Abstract

The utility model provides a battery pack which comprises a plurality of battery packs, and the tops of every two adjacent battery packs are arranged at intervals to form a first gap; the protective layer is connected between the tops of two adjacent battery packs so as to cover at least part of the first gap; a redundant part is arranged in the middle of the protective layer, and the protective layer has a discharging state and a collecting state which can be switched mutually; when the protective layer is in a discharging state, the redundant part is configured to be a convex structure higher than the top of the battery pack; and when the protective layer is in the object collecting state, the redundant part is configured to be a concave structure lower than the top of the battery pack. According to the battery pack provided by the invention, the first gap between the adjacent battery packs is covered by the protective layer, so that the risk that foreign matters enter the space between the two battery packs can be reduced, the damage of the foreign matters to the battery packs is avoided, and the battery packs are favorably protected. The protective layer has a switchable object discharging state and object collecting state and can be switched to different states suitable for the current environment, and foreign matter cleaning is facilitated.

Description

TECHNICAL FIELD

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

[0002] With the increasing demand for the cruising range of new energy vehicles, in order to meet the power requirement, the battery pack used by the new energy vehicle needs to have more single cells connected in series inside.

[0003] Generally, a plurality of cell groups can be arranged in the battery pack, and each cell group includes a plurality of cells stacked in a single column. After two adjacent cell groups are fixed in the battery pack, a gap can exist between the two cell groups. When foreign matter remains in the gap, it can adversely affect the insulation withstand voltage performance of the cells. UTILITY MODEL CONTENT

[0004] Therefore, the present application aims to provide a battery pack to at least partially solve the problem that foreign matter can enter the gap between adjacent cell groups and adversely affect the insulation withstand voltage performance of the cells.

[0005] To achieve the above purpose, the present application provides a battery pack, which comprises: a plurality of battery groups, two adjacent battery groups being spaced apart at the top to form a first gap; a protective layer being connected between the top of the two adjacent battery groups to cover at least part of the first gap; the protective layer having a redundant portion in the middle, and the protective layer having a material-removing state and a material-collecting state which can be switched; when the protective layer is in the material-removing state, the redundant portion is configured as a convex structure higher than the top of the battery group; when the protective layer is in the material-collecting state, the redundant portion is configured as a concave structure lower than the top of the battery group.

[0006] Optionally, the battery pack comprises a battery pack box, and the battery pack box is provided with a containing cavity for containing the battery group; when the battery group is located outside the containing cavity, the protective layer is in the material-removing state; and when the battery group is located inside the containing cavity, the protective layer is in the material-collecting state.

[0007] Optionally, when the protective layer is in the material-removing state, the redundant portion is a tapered convex structure.

[0008] Optionally, when the protective layer is in the material-collecting state, the redundant portion is a tapered groove structure.

[0009] Optionally, each of the battery packs comprises an electric cell stack, a stacking direction of the electric cells in the electric cell stack is defined as a length direction of the battery pack; the plurality of battery packs are arranged along a width direction, the protective layer extends along the length direction of the battery pack, and at least one end of the protective layer can cover an edge of the electric cell stack.

[0010] Optionally, the protective layer comprises a connecting portion connected to at least one side of the redundant portion, and the redundant portion is connected to the top of the battery pack through the connecting portion.

[0011] Optionally, the connecting portion is connected to at least two opposite sides of the redundant portion along the arrangement direction of the plurality of battery packs.

[0012] Optionally, the redundant portion is a sheet-shaped flexible structure.

[0013] Optionally, a pulling portion is arranged on a surface of the redundant portion away from the battery pack, and the pulling portion is used to drive the redundant portion to switch between the protruding structure and the recessed structure.

[0014] Optionally, when the redundant portion is configured as the protruding structure, the pulling portion is located at a tip of the protruding structure.

[0015] Optionally, each of the battery packs comprises an electric cell stack, and a busbar assembly connected to the top of the electric cell stack, and the protective layer is located on the top of the busbar assembly.

[0016] Optionally, along the arrangement direction of the plurality of battery packs, an edge of the redundant portion is close to an edge of the busbar assembly.

[0017] As can be seen from the above, the battery pack provided by the application can reduce the risk of foreign matter entering between two battery packs by covering the first gap between adjacent battery packs with the protective layer, thereby avoiding damage to the battery packs by foreign matter and helping to protect the battery packs.

[0018] Meanwhile, the protective layer has a switchable foreign matter removing state and a foreign matter collecting state, and the protruding redundant portion helps to drive the falling foreign matter out of the battery pack, and the recessed redundant portion helps to gather the foreign matter, facilitating the concentrated cleaning of the foreign matter. According to different environments of the battery pack, the protective layer can be switched to different states suitable for the current environment, facilitating the cleaning of foreign matter and having strong adaptability. BRIEF DESCRIPTION OF DRAWINGS

[0019] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a first type of battery pack according to an embodiment of this application;

[0021] Figure 2 This is a partial schematic diagram of the protective layer of the second type of battery pack in the present application embodiment in the state of being discharged;

[0022] Figure 3 for Figure 2 Schematic diagram of the cross section AA;

[0023] Figure 4 This is a partial schematic diagram of the protective layer of the second type of battery pack in the embodiment of this application when it is in a state of collecting material;

[0024] Figure 5 for Figure 4 Schematic diagram of the cross-section CC;

[0025] Figure 6 This is a schematic diagram of the protective layer of the second type of battery pack in the discharge state according to an embodiment of this application;

[0026] Figure 7 for Figure 3 Enlarged schematic diagram of part B in the middle;

[0027] Figure 8 This is a schematic diagram of the protective layer of the second type of battery pack in the state of collecting material, according to an embodiment of this application.

[0028] Figure 9 for Figure 5 An enlarged schematic diagram of section D in the middle;

[0029] Figure 10 This is a partial top view of the battery pack according to an embodiment of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 100. Battery pack housing; 110. Receiving cavity;

[0032] 200. Battery pack; 210. Cell stack; 211. Cell; 220. End plate; 230. Busbar assembly;

[0033] 300, cold plate; 400, groove; 500, first gap;

[0034] 600, protective layer; 610, redundant part; 611, pulling part; 620, connecting part. DETAILED DESCRIPTION

[0035] For the purposes of the present application, the technical solutions and advantages are more clearly apparent, the following further describes the present application with specific examples and with reference to the accompanying drawings.

[0036] It should be noted that, unless otherwise specified, the relative arrangement of the components, numerical expressions and values set forth in these examples do not limit the scope of the present application.

[0037] It should be understood that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship.

[0038] The following description of at least one example embodiment is merely illustrative in nature and is in no way limiting on the application or its use.

[0039] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by those skilled in the art to which the embodiments of the present application belong. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Include" or "contain" and similar words mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] Figure 1 A schematic view of a first battery pack is shown as Figure 1 The battery pack includes a battery pack box 100, which is provided with a containing cavity 110 for containing a battery pack 200. A plurality of battery packs 200 are arranged in the containing cavity 110, and the plurality of battery packs 200 are arranged along the width direction (e.g. the Y direction in Figure 1 Each battery pack 200 includes a plurality of single-column stacked (stacked in the direction perpendicular to the paper) battery cells 211.

[0041] In order to more efficiently cool the battery cells 211 in the battery pack 200, a cold plate 300 is arranged between adjacent battery packs 200, and the cold plate 300 is adhesively connected in thermal conduction with the battery cells 211. Since the top of the cold plate 300 is lower than the top of the battery cells 211, the top of the cold plate 300 and the side walls of the two adjacent battery cells 211 form a U-shaped groove 400. When foreign matter enters the groove 400, it can remain in the groove 400 and be difficult to discharge. If the foreign matter scratches the battery cells 211, it can adversely affect the insulation and voltage resistance of the battery cells 211.

[0042] To solve the above problems, the application provides a battery pack.

[0043] Figure 2 Part of the schematic diagram of the protection layer 600 of the second battery pack in the discharging state is shown, Figure 3 Part of the schematic diagram of the protection layer 600 of the second battery pack in the discharging state is shown, Figure 2 The cross-sectional view of the A-A section is shown.

[0044] As shown in Figure 2 And Figure 3 The battery pack comprises: a plurality of battery packs 200, and a first gap 500 is formed between the tops of two adjacent battery packs 200; a protection layer 600 connected between the tops of two adjacent battery packs 200 to cover at least part of the first gap 500; the middle part of the protection layer 600 is provided with a redundant part 610, and the protection layer 600 has a discharging state and a collecting state which can be switched with each other. When the protection layer 600 is in the discharging state, the redundant part 610 is configured as a protruding structure higher than the top of the battery pack 200; when the protection layer 600 is in the collecting state, the redundant part 610 is configured as a recessed structure lower than the top of the battery pack 200.

[0045] Figure 4 Part of the schematic diagram of the protection layer 600 of the second battery pack in the discharging state is shown, Figure 5 Part of the schematic diagram of the protection layer 600 of the second battery pack in the discharging state is shown, Figure 4 The cross-sectional view of the C-C section is shown.

[0046] As shown in Figure 4 And Figure 5 When the protection layer 600 is in the collecting state, the redundant part 610 is configured as a recessed structure lower than the top of the battery pack 200.

[0047] For example, a cold plate 300, a heating film, an adhesive layer for connecting the battery packs 200, or a structural plate for connecting the battery packs 200 is arranged between two adjacent battery packs 200 to exchange heat with the battery cells 211.

[0048] For example, the protection layer 600 is fixedly connected or detachably connected with the battery pack 200.

[0049] Exemplarily, the protective layer 600 and the battery pack 200 can be connected by adhesion, insertion, clamping, welding or fastener connection and the like.

[0050] Exemplarily, the redundant part 610 can be switched between the state of arranging the foreign matter and the state of collecting the foreign matter by applying a force to the redundant part 610; or the protective layer 600 can be switched between the state of arranging the foreign matter and the state of collecting the foreign matter by turning over the protective layer 600.

[0051] The protective layer 600 is arranged above the first gap 500 and can cover at least part of the first gap 500 to prevent the foreign matter from entering the first gap 500.

[0052] Meanwhile, when the protective layer 600 is in the state of arranging the foreign matter, the redundant part 610 of the convex structure can form a positive height difference with the top of the battery pack 200 (i.e., the redundant part 610 is higher than the top of the battery pack 200), and the foreign matter falling on the redundant part 610 can move to the top of the battery pack 200 below under the action of the gravitational potential energy, and then move outwards of the entire battery pack 200 to finally slide off the battery pack 200.

[0053] Exemplarily, the protective layer 600 in the state of arranging the foreign matter is more suitable for an environment in which at least one side of the battery pack 200 in the circumferential direction is not covered. At this time, the foreign matter moving to the top of the battery pack 200 can be horizontally cleaned out of the battery pack 200.

[0054] When the protective layer 600 is in the state of collecting the foreign matter, the redundant part 610 of the concave structure can form a negative height difference with the top of the battery pack 200 (i.e., the redundant part 610 is lower than the top of the battery pack 200), and the foreign matter falling into the redundant part 610 is not easy to move out of the redundant part 610 to the top of the battery pack 200, and can be collected in the redundant part 610.

[0055] Exemplarily, the protective layer 600 in the state of collecting the foreign matter is more suitable for an environment in which there is a cover structure in the circumferential direction of the battery pack 200. At this time, the foreign matter cannot be horizontally cleaned out of the battery pack 200, but can only be cleaned from the top of the battery pack 200. Collecting the foreign matter in the concave redundant part 610 can avoid the foreign matter from being scattered and facilitate the concentrated cleaning of the foreign matter.

[0056] The battery pack provided in the embodiment can cover the first gap 500 between the adjacent battery packs 200 by the protective layer 600, which can reduce the risk of the foreign matter entering between the two battery packs 200, and thus avoid the damage of the foreign matter to the battery pack 200, and help to protect the battery pack 200.

[0057] Meanwhile, the protective layer 600 has a switchable state of discharging and a state of collecting, and the convex redundant part 610 helps to drive the falling foreign matter out of the battery pack 200; while the concave redundant part 610 helps to gather the foreign matter, facilitating the centralized cleaning of the foreign matter. According to different environments where the battery pack 200 is located, the protective layer 600 can be switched to different states suitable for the current environment, facilitating the cleaning of foreign matter and having strong adaptability.

[0058] As Figure 3 and Figure 5 In some embodiments, the battery pack includes a battery pack box 100, which is provided with a containing cavity 110 for containing the battery pack 200; when the battery pack 200 is located outside the containing cavity 110, the protective layer 600 is in the state of discharging; when the battery pack 200 is located inside the containing cavity 110, the protective layer 600 is in the state of collecting.

[0059] In combination with the foregoing, when the battery pack 200 is located outside the containing cavity 110 of the battery pack box 100, the battery pack 200 has less shielding structure around, and the foreign matter on the top of the battery pack 200 can be horizontally cleaned out of the battery pack 200. Therefore, the protective layer 600 in the state of discharging is more suitable for the case of being located outside the containing cavity 110.

[0060] When the battery pack 200 is located inside the containing cavity 110, the foreign matter on the top of the battery pack 200 is likely to fall into the containing cavity 110 if it is horizontally cleaned out, and still may cause damage to the battery pack 200. Therefore, the protective layer 600 in the state of collecting is more suitable for the case of being located inside the containing cavity 110, so as to gather the foreign matter in the concave redundant part 610, facilitating the centralized cleaning of the foreign matter.

[0061] Figure 6 a schematic view of the protective layer 600 in the state of discharging is shown, Figure 7 a schematic view of the protective layer 600 in the state of collecting is shown, Figure 3 a schematic view of the enlarged view of part B in FIG. 6A is shown, Figure 6 and Figure 7 In some embodiments, when the protective layer 600 is in the state of discharging, the redundant part 610 is a tapered convex structure.

[0062] For example, when the protective layer 600 is in the state of discharging, the redundant part 610 can be a pyramidal convex structure.

[0063] When the redundant part 610 is a tapered convex structure, the outer side wall surface of the redundant part 610 is a slope extending from the center to the edge from top to bottom. When the foreign matter falls on the slope, it is more likely to move from the redundant part 610 to the top of the battery pack 200, and it is more convenient to horizontally clean the foreign matter out of the battery pack 200.

[0064] Figure 8A schematic view of the protective layer 600 in the set state is shown, Figure 9 A schematic view of the protective layer 600 in the set state is shown, Figure 5 An enlarged schematic view of the middle D part is shown, Figure 8 And Figure 9 In some embodiments, the redundant part 610 is a conical groove structure when the protective layer 600 is in the set state.

[0065] Illustratively, the redundant part 610 can be a pyramidal groove structure when the protective layer 600 is in the set state.

[0066] When the redundant part 610 is a conical groove structure, the groove wall surface of the redundant part 610 is a slope extending from the edge to the center downward, and the foreign matter falling on the slope is more likely to move from the edge to the center of the redundant part 610, which helps to gather the foreign matter in the center of the redundant part 610 and is more convenient for centralized cleaning.

[0067] Figure 10 A schematic view of the battery pack is shown, Figure 2 And Figure 10 In some embodiments, each battery pack 200 includes a cell stack 210, and the stacking direction of the cells 211 in the cell stack 210 is defined as the length direction of the battery pack 200 (such as the X direction in Figure 2 And Figure 10 The plurality of battery packs 200 are arranged in the width direction (such as the Y direction in Figure 2 And Figure 10 The protective layer 600 extends along the length direction of the battery pack 200, and at least one end of the protective layer 600 can cover the edge of the cell stack 210.

[0068] Illustratively, along the length direction of the battery pack 200, the end of the protective layer 600 is flush with the edge of the cell stack 210; or, the end of the protective layer 600 exceeds the edge of the cell stack 210.

[0069] Illustratively, each battery pack 200 includes a cell stack 210, and end plates 220 connected to both ends of the cell stack 210 along the stacking direction of the cells 211 in the cell stack 210, and the end plates 220 and the cell stack 210 can be bonded and / or connected by a binding belt.

[0070] When the end of the protective layer 600 covers the edge of the battery cell stack 210, it indicates that the end of the protective layer 600 has extended to the same side end of the battery cell stack 210, that is, the protective layer 600 completely covers the end cell 211 of the battery cell stack 210. It can be understood that when both ends of the protective layer 600 cover the edges of the battery cell stack 210, then the two ends of the protective layer 600 have respectively extended to the ends of the battery cell stack 210, that is, the protective layer 600 completely covers the part of the first gap 500 where the battery cell 211 is arranged, which can more reliably prevent external foreign matters from entering the first gap 500, more effectively avoid the damage of foreign matters to the battery cell 211, and help to improve the safety and service life of the battery pack.

[0071] As Figure 2 In some embodiments, the protective layer 600 includes a connecting portion 620 connected to at least one side of the redundant portion 610, and the redundant portion 610 is connected to the top of the battery pack 200 through the connecting portion 620.

[0072] For example, the connecting portion 620 is connected to the redundant portion 610 by bonding, one-piece molding or insertion, etc.

[0073] For example, the connecting portion 620 is close to the surface of the battery pack 200 and is a plane, so that the connecting portion 620 can be connected to the top surface of the battery pack 200.

[0074] Since the redundant portion 610 of the protective layer 600 needs to switch between the convex structure and the concave structure, it is difficult for the redundant portion 610 itself to form a reliable connection with the battery pack 200. In order to prevent the protective layer 600 and the battery pack 200 from being separated from each other, at least one connecting portion 620 is connected to at least one side of the redundant portion 610 in the embodiment, and a relatively stable connecting portion 620 is used to form a relatively reliable connection with the battery pack 200, thereby avoiding the relative movement between the protective layer 600 and the battery pack 200, and keeping the redundant portion 610 covering the first gap 500.

[0075] As Figure 7 In some embodiments, the connecting portion 620 is connected to at least two opposite sides of the redundant portion 610 along the arrangement direction of the plurality of battery packs 200 (such as the Y direction in Figure 7 In some embodiments, the connecting portion 620 is connected to at least two opposite sides of the redundant portion 610 along the arrangement direction of the plurality of battery packs 200 (such as the Y direction in

[0076] The two connecting portions 620 located on the opposite sides of the redundant portion 610 can be respectively connected to the top of each of the two battery packs 200 forming the first gap 500, and the two connecting portions 620 simultaneously act on the redundant portion 610, which can provide a relatively uniform force to the redundant portion 610, further avoiding the relative movement between the protective layer 600 and the battery pack 200, and keeping the redundant portion 610 covering the first gap 500.

[0077] As Figure 7 In some embodiments, the redundant portion 610 of the protection layer 600 is a sheet-shaped flexible structure.

[0078] For example, the connecting portion 620 is also a sheet-shaped structure and is integrally formed with the redundant portion 610.

[0079] For example, the redundant portion 610 has at least two memory structures, i.e., a conical protruding structure and a conical groove structure, and can switch between the conical protruding structure and the conical groove structure.

[0080] When the redundant portion 610 is a flexible structure, the redundant portion 610 can be deformed by applying an external force to the redundant portion 610, i.e., the redundant portion 610 can switch between the protruding structure and the recessed structure, so that the protection layer 600 can switch between the state of arranging the objects and the state of gathering the objects.

[0081] The redundant portion 610 is designed as a sheet-shaped structure, which is convenient for the redundant portion 610 to switch between different structures, and can also reduce the mass and the amount of materials of the protection layer 600, thereby helping to reduce the overall manufacturing cost of the battery pack, and can also reduce the internal space of the accommodation cavity 110 occupied by the protection layer 600, thereby helping to improve the energy density of the battery pack.

[0082] As Figure 7 And Figure 9 In some embodiments, the redundant portion 610 is provided with a pulling portion 611 away from the surface of the battery pack 200, and the pulling portion 611 is used to drive the redundant portion 610 to switch between the protruding structure and the recessed structure.

[0083] For example, the pulling portion 611 can be a vertical ring structure formed on the upper surface of the redundant portion 610, or a vertical protruding structure (e.g., a columnar structure).

[0084] When it is needed to switch the redundant portion 610 from the protruding structure to the recessed structure, the pulling portion 611 can be pressed downward, and the pulling portion 611 will transmit the downward pressing force to other areas of the redundant portion 610, so that the flexible redundant portion 610 is deformed downward to form the recessed structure. At this time, the protection layer 600 is in the state of gathering the objects.

[0085] When it is needed to switch the redundant portion 610 from the recessed structure to the protruding structure, the pulling portion 611 can be pulled upward, and the pulling portion 611 will transmit the upward pulling force to other areas of the redundant portion 610, so that the flexible redundant portion 610 is deformed upward to form the protruding structure. At this time, the protection layer 600 is in the state of arranging the objects.

[0086] By arranging the pulling part 611 on the surface of the redundancy part 610 away from the battery pack 200, no matter whether the redundancy part 610 is in the protruding structure or the recessed structure, the pulling part 611 is located on the exposed surface of the redundancy part 610, which is convenient for the operator or the equipment to change the structure of the redundancy part 610 by pressing or pulling action, so as to make the protective layer 600 switch between the arranged state and the gathered state more conveniently and quickly.

[0087] For example, Figure 7 and Figure 9 In some embodiments, when the redundancy part 610 is configured as a protruding structure, the pulling part 611 is located at the tip of the protruding structure.

[0088] Since the pulling part 611 is located at the tip of the protruding structure, that is, the highest position, when the redundancy part 610 is switched from the recessed structure to the protruding structure, as long as the pulling part 611 is pulled to the preset position, the rest of the redundancy part 610 will also be lifted to the respective preset positions under the driving of the pulling part 611.

[0089] Similarly, when the redundancy part 610 is configured as a recessed structure, the pulling part 611 is located at the lowest position of the redundancy part 610. When the redundancy part 610 is switched from the protruding structure to the recessed structure, as long as the pulling part 611 is pressed to the preset position, the rest of the redundancy part 610 will also be lowered to the respective preset positions under the driving of the pulling part 611.

[0090] Meanwhile, in the present embodiment, the pulling part 611 is located at the center position of the upper surface of the redundancy part 610, which can make the pulling part 611 more uniformly transmit the pressing force or the lifting force to other areas of the redundancy part 610, so as to facilitate the redundancy part 610 to complete the switching between the protruding structure and the recessed structure.

[0091] For example, Figure 2 and Figure 7 In some embodiments, each battery pack 200 includes a cell stack 210 and a busbar assembly 230 connected to the top of the cell stack 210, and the protective layer 600 is located on the top of the busbar assembly 230.

[0092] For example, the busbar assembly 230 can include a bar sheet, a sensor, an insulating layer and a circuit board. The bar sheet can be used to realize the series connection between different cells 211. The area between the bar sheet and the cell 211 which is not connected is provided with an insulating layer to avoid the short circuit of the cell 211. The sensor is in thermal connection with the cell 211, and the sensor is also in electrical connection with the circuit board to monitor the working state of the cell 211.

[0093] For example, the busbar assembly 230 can further include a protective cover plate covering the circuit board, the sensor and the bar sheet.

[0094] For example, the protective layer 600 can be connected with a circuit board or a protective cover plate.

[0095] For example, the protective layer 600 is an insulating material layer.

[0096] The busbar assembly 230 is located at the top of the battery pack 200, and the protective layer 600 is arranged on the top of the busbar assembly 230, that is, the protective layer 600 is located on the top surface of the battery pack 200. On the one hand, when the protective layer 600 is assembled on the battery pack 200, the position of the protective layer 600 can be observed, thereby facilitating the assembly of the battery pack. On the other hand, the redundant part 610 of the protective layer 600 can be easily subjected to an external force, so that the protective layer 600 can be switched between the disordered state and the ordered state more conveniently and quickly.

[0097] For example, the protective layer 600 is an insulating material layer. Figure 7 For example, the protective layer 600 is an insulating material layer. Figure 9 In some embodiments, the edge of the redundant part 610 is close to the edge of the busbar assembly 230 along the arrangement direction of the plurality of battery packs 200.

[0098] Since the upper end opening of the first gap 500 is located between the two busbar assemblies 230, and the edge of the redundant part 610 is close to the edge of the busbar assembly 230, the redundant part 610 can more comprehensively cover the upper end opening of the first gap 500. At the same time, since the redundant part 610 does not coincide with the busbar assembly 230, interference between the busbar assembly 230 and the redundant part 610 can be avoided, and the state switching of the protective layer 600 can be ensured.

[0099] It should be noted that some embodiments of the present application are described above. Other embodiments are within the scope of the appended claims. In some cases, the acts or steps recited in the claims can be performed in an order different than that described above and still achieve desirable results. Additionally, the process depicted in the figures does not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some implementations, multitasking and parallel processing can be advantageous.

[0100] 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 mutually referred to.

[0101] The description of the application is presented for purposes of illustration and description, and not by limitation. Numerous modifications and variations on the embodiments described herein will be apparent to those of ordinary skill in the art in light of the foregoing description. The embodiments are chosen and described in order to best explain the principles of the application and its practical application to thereby enable others skilled in the art to best utilize the application. Various embodiments of the application are contemplated and can be made without departing from the spirit or scope of the application.

[0102] It should be understood that any of the above-described embodiments can be implemented in the form of control logic using hardware (e.g. an application specific integrated circuit or field programmable gate array) or a combination of hardware and software (e.g. software running on a processor or microprocessor). The software can be software stored in a computer readable storage medium such as RAM (random access memory) or ROM, for example, erasable programmable ROM, electrically erasable programmable ROM, flash memory or the like.

[0103] Although the application has been described in conjunction with specific embodiments thereof, numerous alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description.

[0104] Embodiments of the application are intended to cover any and all alternatives, modifications, and variations of the above-described embodiments. Accordingly, any and all such alternatives, modifications, and variations should be included within the scope of the application.

Claims

1. A battery pack, characterized by, The application relates to a battery pack, comprising: a plurality of battery groups, the top portions of two adjacent battery groups being spaced apart to form a first gap; a protective layer connected between the top portions of two adjacent battery groups to cover at least part of the first gap; the middle portion of the protective layer is provided with a redundant portion, and the protective layer has a discharging state and a charging state which can be switched; when the protective layer is in the discharging state, the redundant portion is configured as a convex structure higher than the top portion of the battery group; when the protective layer is in the charging state, the redundant portion is configured as a concave structure lower than the top portion of the battery group.

2. The battery pack of claim 1, wherein, The battery pack comprises a battery pack box provided with a containing cavity for containing the battery groups; when the battery groups are located outside the containing cavity, the protective layer is in the discharging state; when the battery groups are located inside the containing cavity, the protective layer is in the charging state.

3. The battery pack of claim 1, wherein, When the protective layer is in the discharging state, the redundant portion is a tapered convex structure.

4. The battery pack of claim 1, wherein, When the protective layer is in the charging state, the redundant portion is a tapered groove structure.

5. The battery pack of claim 1, wherein, Each battery group comprises an electric core stack, and the stacking direction of the electric cores in the electric core stack is defined as the length direction of the battery group. A plurality of battery groups are arranged along the width direction, the protective layer extends along the length direction of the battery group, and at least one end of the protective layer can cover the edge of the electric core stack.

6. The battery pack of claim 1, wherein, The protective layer comprises a connecting portion connected to at least one side of the redundant portion, and the redundant portion is connected to the top portion of the battery group through the connecting portion.

7. The battery pack of claim 6, wherein, The connecting portion is connected to at least two opposite sides of the redundant portion along the arrangement direction of the plurality of battery groups.

8. The battery pack of claim 1, wherein, The redundant portion is a sheet-shaped flexible structure.

9. The battery pack of claim 8, wherein, The surface of the redundant portion away from the battery group is provided with a pulling sub-portion for driving the redundant portion to switch between the convex structure and the concave structure.

10. The battery pack of claim 9, wherein, When the redundant portion is configured as the convex structure, the pulling sub-portion is located at the tip of the convex structure.

11. The battery pack of claim 1, wherein, Each battery group comprises an electric core stack and a busbar assembly connected to the top portion of the electric core stack, and the protective layer is located on the top portion of the busbar assembly.

12. The battery pack of claim 11, wherein, Along the arrangement direction of the plurality of battery groups, the edge of the redundant portion is close to the edge of the busbar assembly.

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