Battery pack and module-free battery pack

Abstract

The utility model relates to a battery pack and a module-free battery pack, the battery pack is provided with a plurality of battery cells which are sequentially arranged along the thickness direction of the battery cells, and each battery cell comprises a shell; in the thickness direction of the battery cells, a shell of one of any two adjacent battery cells is provided with a limiting piece, a shell of the other battery cell is provided with a limiting matching part, and the limiting matching part and the limiting piece are matched in a limiting mode to limit relative movement between the adjacent battery cells, so that stable connection between the two adjacent battery cells is achieved. The battery pack does not need to use an end plate and a steel belt to restrain and fix a plurality of battery cells which are connected together, so that materials are saved, the space occupied by the battery pack is also saved, the light weight of the battery pack is favorably realized, and the energy density of the battery pack is improved.

Description

TECHNICAL FIELD

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

[0002] A conventional battery module includes a plurality of battery cells, which are connected and stacked in groups by foam and glue in sequence, and are fixed and constrained by end side plates or end plates in combination with steel straps on the outer side of the plurality of battery cells to form a battery module structure.

[0003] The assembly structure of the above battery module is relatively complex, and the weight is large, which is not conducive to the lightweight of the battery pack. With the progress of battery assembly technology, the module-free battery pack is becoming the mainstream trend in the industry. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a battery pack and a module-free battery pack, which can solve the problem of excessive weight of the battery pack in the prior art and cannot realize lightweight.

[0005] The first aspect of the present application provides a battery pack, which has a plurality of battery cells arranged in sequence along the thickness direction of the battery cells, and the battery cells include a shell; along the thickness direction of the battery cells, the shell of one of any two adjacent battery cells is provided with a limiting piece, and the shell of the other is provided with a limiting fitting part, and the limiting fitting part and the limiting piece are limited and fitted with each other to limit the relative movement between the adjacent battery cells.

[0006] In a possible design, the limiting fitting part is a clamping groove; the limiting piece is a buckle, and the buckle has a clamping part, and the clamping part is clamped and fixed with the clamping groove.

[0007] In a possible design, along the width direction of the clamping groove, the size of the clamping part is greater than the size of the clamping groove; the clamping part has a guide inclined surface, and the guide inclined surface is used for guiding and matching with the clamping groove in the process of the clamping part extending into the clamping groove.

[0008] In a possible design, along the length direction of the clamping groove, the size of the clamping groove is greater than the size of the clamping part.

[0009] In a possible design, the shell includes a shell body and an elastic component, the shell body includes a first surface and a second surface which are relatively distributed along the thickness direction of the battery cell; and at least one of the first surface and the second surface is installed with the elastic component.

[0010] In a possible design, the elastic component includes a first elastic component and a second elastic component, the first elastic component includes a first connecting portion, and the limiting piece is arranged on the first connecting portion; the second elastic component includes a second connecting portion, and the limiting fitting portion is arranged on the second connecting portion; along the thickness direction of the battery cell, the first elastic component is arranged on the shell of one of any two adjacent battery cells, and the second elastic component is arranged on the shell of the other battery cell.

[0011] In a possible design, the first elastic component further includes a first abutting portion, at least part of the first abutting portion is arranged in a protruding manner along the thickness direction of the battery cell and away from the shell; and / or, the second elastic component further includes a second abutting portion, at least part of the second abutting portion is arranged in a protruding manner along the thickness direction of the battery cell and away from the shell.

[0012] In a possible design, along the length direction of the battery cell, at least one end of the first elastic component is provided with the first abutting portion; and / or, along the length direction of the battery cell, at least one end of the second elastic component is provided with the second abutting portion.

[0013] In a possible design, along the thickness direction of the battery cell, there is a gap space between any two adjacent battery cells, and the gap space is filled with a heat insulation material.

[0014] The second aspect of the present application provides a module-free battery pack, including a box body and the battery pack described above, the battery pack is installed in the box body; the shell of the battery cell at both ends of the battery pack is provided with a guide portion, and the guide portion enables the battery pack to be guided and matched with the inner wall of the box body.

[0015] In the embodiment of the present application, a plurality of battery cells are connected together in sequence by means of limiting pieces and limiting fitting portions, which can realize the assembly of the battery pack, improve the connection stability between adjacent two battery cells, and thus improve the connection reliability of the whole battery pack and the structural strength of the battery pack. Compared with the prior art in which a plurality of battery cells are stacked in sequence by means of foam and glue, and then fixed and constrained into a battery pack by end plates and steel belts, the assembly process of the battery pack can be simplified, and the assembly efficiency can be improved. Moreover, in the battery pack provided in the embodiment of the present application, the plurality of battery cells connected together do not need to be fixed and constrained by end plates and steel belts, which saves materials and saves the space occupied by the battery pack, and is conducive to realizing the lightweight of the battery pack and improving the energy density of the battery pack.

[0016] It should be understood that the foregoing general description and the following detailed description are only exemplary and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 This is a schematic diagram of the battery pack provided in this application;

[0018] Figure 2 for Figure 1 A schematic diagram of the structure of a battery cell;

[0019] Figure 3 for Figure 1 A schematic diagram of the structure of another battery cell in the system;

[0020] Figure 4 for Figure 2 A schematic diagram of the buckle structure in the middle;

[0021] Figure 5 for Figure 2 The buckle and Figure 3 A diagram showing the connection of the card slots in the middle;

[0022] Figure 6 for Figure 1 A schematic diagram of the battery pack from another perspective.

[0023] Figure label:

[0024] 100-battery pack;

[0025] 10-cell;

[0026] 20 - Gap space;

[0027] 1-Outer shell;

[0028] 11-Shell;

[0029] 11a - First surface;

[0030] 11b - Second surface;

[0031] 2-Card slot;

[0032] 3-Snap fastener;

[0033] 31-Connecting part;

[0034] 311 - Guide ramp;

[0035] 312-Limit Platform;

[0036] 32-Main body;

[0037] 4-Elastic components;

[0038] 41-First elastic component;

[0039] 411-First connecting part;

[0040] 412 - First contact section;

[0041] 413 - First fixing part;

[0042] 42 - Second elastic component;

[0043] 421 - Second connecting part;

[0044] 422 - Second contact section;

[0045] 423 - Second fixing part;

[0046] 43 - Third elastic component;

[0047] 431 - Third contact section;

[0048] 5-Guide section;

[0049] 6-Injection hole;

[0050] 7-Explosion-proof valve;

[0051] 8-Pole Column.

[0052] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0053] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0054] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0055] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0056] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0057] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0058] This application provides a battery pack 100, such as... Figure 1 As shown, the battery pack 100 includes a plurality of cells 10 arranged sequentially along the thickness direction X of a single cell 10, and each cell 10 includes a casing 1. For example... Figure 2 and Figure 3 As shown, along the thickness direction X of the cell 10, the outer shell 1 of any two adjacent cells 10 is provided with a limiting member, and the outer shell 1 of the other cell is provided with a limiting engagement part corresponding to the limiting member. The limiting engagement part can form a limiting engagement with the limiting member to restrict the relative movement of the two adjacent cells 10 along the thickness direction X of the cell 10, thereby realizing a stable connection between the two adjacent cells 10.

[0059] In this embodiment, multiple battery cells 10 are sequentially connected by mutual limiting and engaging components, enabling the assembly of the battery pack 100 and improving the connection stability between adjacent cells 10. This enhances the overall connection reliability and structural strength of the battery pack 100. Compared to the prior art where multiple cells 10 are stacked sequentially using foam and adhesive, and then fixed and constrained into a battery pack 100 by end plates and steel strips, this embodiment simplifies the assembly process and improves assembly efficiency. Furthermore, the battery pack 100 provided in this embodiment eliminates the need for end plates and steel strips to constrain and fix the connected cells 10, saving materials, space, and weight. This facilitates lightweighting and increases the energy density of the battery pack 100, making it suitable for assembling module-less battery packs.

[0060] For a single battery cell 10, if it is connected to other battery cells 10 on both sides along its own thickness direction X, a limiting member and a limiting mating part can be respectively provided on both sides along its own thickness direction X. Correspondingly, the two other battery cells 10 connected to it are respectively provided with a limiting mating part and a limiting part on the side facing the battery cell 10. Alternatively, the battery cell 10 can be provided with a limiting member or a limiting mating part on both sides along its own thickness direction X. Correspondingly, the two other battery cells 10 connected to it are both provided with a limiting mating part or both provided with a limiting member on the side facing the battery cell 10. This application embodiment does not limit this.

[0061] For the battery pack 100, the embodiments of this application do not limit the specific number of cells 10 in the battery pack 100, and users can design according to specific needs.

[0062] The limiting element can be a spring, and the limiting mating part can be a slot that mates with the spring; or, the limiting element can be a bolt, and the limiting mating part can be a screw hole that mates with the bolt; or, as... Figure 2 and Figure 3 As shown, the limiting component can be a buckle 3, and the limiting mating part can be a slot 2 that mates with the buckle 3.

[0063] The following section will further introduce the structure of the battery cell 10, taking the buckle 3 as the limiting component and the slot 2 as the limiting mating part as the limiting component.

[0064] like Figure 4 and Figure 5 As shown, the buckle 3 includes a snap-fit ​​portion 31 and a main body portion 32 that are fixedly connected. The snap-fit ​​portion 31 and the main body portion 32 can be an integral structure or a separate structure, and this embodiment does not limit this. Specifically, the main body portion 32 extends along the thickness direction X of the cell 10, the snap-fit ​​portion 31 is located at one end of the main body portion 32 near the adjacent cell 10, and the snap-fit ​​portion 31 extends along the length direction Y of the cell 10. The snap-fit ​​portion 31 can extend into the slot 2 and snap-fit ​​and fix with the slot 2, thereby realizing a fixed connection between two adjacent cells 10. The way the buckle 3 and the slot 2 cooperate has strong reliability and can ensure the connection stability between two adjacent cells 10, thereby improving the stability of the battery pack 100. Moreover, the connection operation of the buckle 3 and the slot 2 is relatively simple, which is conducive to improving the assembly efficiency of the battery pack 100.

[0065] Specifically, along the length Y of the battery cell 10, the size of the latching portion 31 is larger than the size of the main body portion 32. The portion of the latching portion 31 larger than the main body portion 32 forms a limiting platform 312. The latching portion 31 also has a guide slope 311, which guides and cooperates with the slot 2 during the process of the latching portion 31 extending into the slot 2, thereby improving the connection efficiency between the buckle 3 and the slot 2. Along the length Y of the battery cell 10, the size of the latching portion 31 should be larger than the size of the slot 2. Therefore, when the latching portion 31 extends into the slot 2, it can undergo slight deformation under the action of the slot 2, thus smoothly entering the slot 2. When the latching portion 31 enters the slot 2 and the deformation returns to normal, the limiting platform 312 can form a stable limit with the internal structure of the slot 2, preventing the latching portion 31 from coming out of the slot 2, thereby achieving the latching and fixing of the latching portion 31 and the slot 2.

[0066] It should be noted that the above description of the slot 2 and the buckle 3 is based on the fact that the length direction of the slot 2 is parallel to the height direction Z of the battery cell 10, and the width direction of the slot 2 is parallel to the length direction Y of the battery cell 10 (e.g., Figure 4 and Figure 5 The embodiment shown is illustrated below. In other embodiments, the length direction of the slot 2 may be parallel to the length direction Y of the battery cell 10, or the length direction of the slot 2 may be set at an angle to the length direction Y of the battery cell 10, as long as the size of the latching portion 31 is larger than the size of the slot 2 in the width direction. This application embodiment is described using the example of the length direction of the slot 2 being parallel to the height direction Z of the battery cell 10.

[0067] like Figure 3 As shown, along the length of the slot 2, the size of the slot 2 is larger than the size of the snap-fit ​​part 31. This makes it easier for the buckle 3 to align and connect with the slot 2. The user can first insert the snap-fit ​​part 31 into the slot 2, and then adjust the relative position of the two cells 10 along the height direction Z of the cell 10 to reduce the impact of the manufacturing precision of the slot 2 on the assembly connection process. Even if there are some dimensional deviations in the position of the slot 2 during the processing, it will not affect the assembly of the cell 10.

[0068] Furthermore, such as Figure 2 As shown, the outer casing 1 of the battery cell 10 can be provided with multiple buckles 3 spaced Z apart along the height direction of the battery cell 10, and then combined with Figure 5 As shown, a slot 2 can engage with multiple buckles 3 spaced apart along the height direction Z of the cell 10, thereby improving the connection reliability and stability of two adjacent cells 10.

[0069] Moreover, such as Figure 2 , Figure 3 and Figure 5As shown, along the length direction Y of the battery cell 10, the outer shell 1 of the battery cell 10 can be provided with multiple rows of buckles 3 at intervals; correspondingly, the outer shell 1 of another battery cell 10 connected to the battery cell 10 can be provided with multiple slots 2 distributed at intervals along the length direction Y of the battery cell 10, so as to further improve the connection reliability and stability of the two adjacent battery cells 10.

[0070] like Figure 1 As shown, the outer casing 1 includes a housing 11 and an elastic member 4. The housing 11 includes a first surface 11a and a second surface 11b that are distributed opposite to each other along the thickness direction X of the battery cell 10. At least one of the first surface 11a and the second surface 11b is fitted with the elastic member 4. The elastic member 4 can be made of plastic, metal sheet, or other elastic materials. When the elastic member 4 is installed in the housing 11, it can effectively mitigate and absorb the expansion of the battery cell 10 during charging and discharging, thus ensuring the performance of the battery pack 100.

[0071] The limiting member and the limiting mating part can be directly disposed on the housing 11; or, they can be disposed on the elastic member 4. Specifically, the elastic member 4 includes a first elastic member 41 and a second elastic member 42. The first elastic member 41 includes a first connecting part 411, and the limiting member is disposed on the first connecting part 411. The second elastic member 42 includes a second connecting part 421, and the limiting mating part is disposed on the second connecting part 421. Along the thickness direction X of the cell 10, the housing 11 of any two adjacent cells 10 is equipped with the first elastic member 41, and the housing 11 of the other cell is equipped with the second elastic member 42. That is, the space on the elastic member 4 can be used to set the limiting member and the limiting mating part to realize the integration of the cell 10 structure.

[0072] Taking the buckle 3 as the limiting component and the slot 2 as the limiting mating part as an example, the explanation is as follows: Figure 2 As shown, the first elastic component 41 includes a first connecting portion 411 and a first fixing portion 413. The first fixing portion 413 can be fixedly connected to the housing 11 by welding or bonding, or it can be integrally formed with the housing 11. A buckle 3 is provided on the first connecting portion 411. The first fixing portion 413 is provided on both sides of the first elastic component 41 along the height direction Z of the battery cell 10 to increase the connection area between the first elastic component 41 and the housing 11, thereby improving the connection reliability between the first elastic component 41 and the housing 11.

[0073] like Figure 3As shown, the second elastic component 42 includes a second connecting portion 421 and a second fixing portion 423. The second fixing portion 423 can be fixedly connected to the housing 11 by welding or bonding. The second connecting portion 421 is provided with a slot 2. Along the height direction Z of the battery cell 10, the second fixing portion 423 is provided on both sides of the second elastic component 42 to increase the connection area between the second elastic component 42 and the housing 11, thereby improving the connection reliability between the second elastic component 42 and the housing 11. Furthermore, along the thickness direction X of the battery cell 10, there should be a certain gap between the second connecting portion 421 and the housing 11 to ensure that the snap-fit ​​portion 31 can be accommodated within the gap after extending into the slot 2. That is, the limiting platform 312 and the surface of the second connecting portion 421 near the housing 11 form a snap-fit ​​limiting fit.

[0074] For a single battery cell 10, a first elastic member 41 can be installed on the first surface 11a of its housing 11, and a second elastic member 42 can be installed on the second surface 11b of its housing 11; or, the first elastic member 41 can be installed on both the first surface 11a and the second surface 11b of its housing 11; or, the second elastic member 42 can be installed on both the first surface 11a and the second surface 11b of its housing 11. The housings 11 of other battery cells 10 connected to this battery cell 10 can be fitted with either the first elastic member 41 or the second elastic member 42, which will not be elaborated further here.

[0075] like Figure 2 As shown, the first elastic member 41 further includes a first abutting portion 412, which is located between the two first fixing portions 413 along the height direction Z of the cell 10. At least a portion of the first abutting portion 412 has a protruding portion along the thickness direction X of the cell 10 in a direction away from the housing 11, and / or, as shown... Figure 3 As shown, the second elastic member 42 also includes a second abutment portion 422, which is located between the two second fixing portions 423 along the height direction Z of the cell 10. At least a portion of the second abutment portion 422 has a protrusion along the thickness direction X of the cell 10 toward the direction away from the housing 11.

[0076] Specifically, the first abutment portion 412 with the protrusion is an arched structure, which can improve the stiffness and structural stability of the first elastic member 41, thereby further enhancing the ability of the first elastic member 41 to mitigate and absorb the expansion of the battery cell 10. Similarly, the second abutment portion 422 with the protrusion is an arched structure, which can improve the stiffness and structural stability of the second elastic member 42, thereby further enhancing the ability of the second elastic member 42 to mitigate and absorb the expansion of the battery cell 10.

[0077] Along the length Y direction of the battery cell 10, at least one end of the first elastic member 41 is provided with a first abutment portion 412, such as... Figure 2As shown, when the first elastic member 41 is provided with first abutting portions 412 at both ends along the length direction Y of the cell 10, it can ensure that the cell 10 maintains force balance in its length direction Y, which is beneficial to improving the stability of the cell 10. Correspondingly, the first connecting portion 411 can be located between the two first abutting portions 412.

[0078] And / or, along the length Y direction of the battery cell 10, at least one end of the second elastic member 42 is provided with a second abutment portion 422, such as Figure 3 As shown, when the second elastic member 42 is provided with a second abutment portion 422 at both ends along the length direction Y of the cell 10, it can also ensure that the cell 10 maintains a force balance in its length direction Y, which is beneficial to improving the stability of the cell 10. Correspondingly, the second connection portion 421 can be located between the two second abutment portions 422.

[0079] like Figure 6 As shown, for two adjacent and connected battery cells 10, if the first elastic member 41 of one cell is provided with a first abutting part 412 and the second elastic member 42 of the other cell is provided with a second abutting part 422, the two battery cells 10 can form an abutting and limiting cooperation through the first abutting part 412 and the second abutting part 422, which is beneficial to further improve the structural reliability and stability of the battery pack 100.

[0080] Furthermore, to facilitate the smooth installation of the battery pack 100 into the housing of the moduleless battery pack, guide portions 5 can be provided on the outer shell 1 of the cells 10 located at both ends of the battery pack 100 along the thickness direction X of the cells 10. The guide portions 5 guide the battery pack 100 to cooperate with the inner wall of the housing during the insertion process, thereby improving the assembly efficiency of the moduleless battery pack. Specifically, the guide portions 5 can be directly provided on the housing 11, or the outer shell 1 of the cells 10 located at both ends of the battery pack 100 can also include a third elastic member 43, with the guide portions 5 provided on the side surface of the third elastic member 43 facing the inner wall of the housing.

[0081] like Figure 1 As shown, the third elastic member 43 has a third abutment portion 431. At least a portion of the third abutment portion 431 has a protrusion along the thickness direction X of the cell 10, moving away from the housing 11. The lower half of the third abutment portion 431 along the height direction Z of the cell 10 constitutes the guide portion 5. In this embodiment, the third elastic member 43 is identical to the first elastic member 41 and the second elastic member 42 except for lacking the first connecting portion 411 and the second connecting portion 421. However, to save manufacturing costs, the third elastic member 43 can also have the same structure as the second elastic member 42 and be manufactured using the same mold.

[0082] like Figure 6As shown, along the thickness direction X of the cell 10, there is a gap space 20 between any two adjacent cells 10. The gap space 20 is filled with heat-insulating material, specifically heat-insulating adhesive. The heat-insulating adhesive not only meets the insulation and flame-retardant requirements between two adjacent cells 10, but also acts as a buffer between the two cells 10 to assist the first elastic component 41 and the second elastic component 42 in mitigating the expansion of the cell 10. Specifically, after multiple cells 10 are sequentially connected to form a battery pack 100 through limiting members and limiting mating parts, a tooling can be used to surround the outside of the battery pack 100, and then liquid heat-insulating adhesive can be poured into the gap space 20. After the heat-insulating adhesive has cured, the tooling can be removed to prevent the adhesive from overflowing. Liquid heat-insulating adhesive is chosen because it has strong fluidity, making it easy to fill the entire gap space 20. Furthermore, the curing process of the liquid adhesive can assist in the connection between the two cells 10, which helps to improve the connection reliability between two adjacent cells 10.

[0083] In addition, such as Figure 1 As shown, the battery cell 10 is also equipped with an injection port 6, an explosion-proof valve 7, and a terminal post 8. The injection port 6 is used to inject electrolyte into the battery cell 10. The explosion-proof valve 7 is used to monitor the internal pressure and temperature of the battery cell 10. When the pressure or temperature exceeds a set value, the explosion-proof valve 7 will automatically open and release pressure to reduce the internal pressure of the battery cell 10 and prevent an explosion. The terminal post 8 is used to conduct current and connect the battery cell 10 to electrical equipment. Its main function is to connect the positive or negative terminal of the battery cell 10 to the positive or negative terminal of the equipment. The injection port 6, the explosion-proof valve 7, and the terminal post 8 can be located at one end of the housing 11 along the height direction Z of the battery cell 10 or at both ends of the housing 11 along the height direction Z of the battery cell 10.

[0084] This application embodiment also provides a moduleless battery pack, including a housing and the battery pack 100 described above. The battery pack 100 is installed in the housing. Since the battery pack 100 has the above-mentioned technical effects, the moduleless battery pack including the battery pack 100 should also have the corresponding technical effects, which will not be elaborated here.

[0085] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery pack characterized by comprising: The battery pack (100) has a plurality of battery cells (10) arranged in sequence along the thickness direction of the battery cell (10), and the battery cell (10) comprises a shell (1); Along the thickness direction of the battery cell (10), the shell (1) of one of any two adjacent battery cells (10) is provided with a limiting piece, and the shell (1) of the other is provided with a limiting matching part, which is limited and matched with each other to limit the relative movement between the adjacent battery cells (10); The shell (1) comprises a shell (11) and an elastic component (4), and the shell (11) comprises a first surface (11a) and a second surface (11b) oppositely distributed along the thickness direction of the battery cell (10); At least one of the first surface (11a) and the second surface (11b) is provided with the elastic component (4).

2. The battery pack according to claim 1, characterized by The limiting matching part is a clamping groove (2); The limiting piece is a buckle (3), and the buckle (3) has a clamping part (31) which is clamped and fixed with the clamping groove (2).

3. The battery pack of claim 2, wherein, Along the width direction of the clamping groove (2), the size of the clamping part (31) is greater than that of the clamping groove (2); The clamping part (31) has a guide inclined surface (311) which is used for guiding and matching with the clamping groove (2) in the process of the clamping part (31) extending into the clamping groove (2).

4. The battery pack of claim 2, wherein, Along the length direction of the clamping groove (2), the size of the clamping groove (2) is greater than that of the clamping part (31).

5. The battery pack of claim 1, wherein, The elastic component (4) comprises a first elastic component (41) and a second elastic component (42), the first elastic component (41) comprises a first connecting part (411), and the limiting piece is arranged on the first connecting part (411); The second elastic component (42) comprises a second connecting part (421), and the limiting matching part is arranged on the second connecting part (421); Along the thickness direction of the battery cell (10), the shell (11) of one of any two adjacent battery cells (10) is provided with the first elastic component (41), and the shell (11) of the other is provided with the second elastic component (42).

6. The battery pack of claim 5, wherein, The first elastic component (41) further comprises a first abutting part (412), and at least part of the first abutting part (412) is arranged in a protruding part in a direction away from the shell (11) along the thickness direction of the battery cell (10); And / or, the second elastic component (42) further comprises a second abutting part (422), and at least part of the second abutting part (422) is arranged in a protruding part in a direction away from the shell (11) along the thickness direction of the battery cell (10).

7. The battery pack of claim 6, wherein, Along the length direction of the battery cell (10), at least one end of the first elastic component (41) is provided with the first abutting part (412); And / or, along the length direction of the battery cell (10), at least one end of the second elastic component (42) is provided with the second abutting part (422).

8. The battery pack according to any one of claims 1 to 7, characterized by, Along the thickness direction of the electric core (10), there is a gap space (20) between any two adjacent electric cores (10), and the gap space (20) is filled with a thermal insulation material.

9. A module-less battery pack, characterized by, The battery pack (100) of any one of claims 1-8 is installed in the box. The shell (1) of the electric core (10) at both ends of the battery pack (100) is provided with a guide part (5), and the guide part (5) guides the battery pack (100) and the inner wall of the box.

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