Battery pack capable of absorbing battery cell expansion

Abstract

The utility model discloses a battery pack capable of absorbing battery cell expansion, and belongs to the technical field of battery packs. Comprising a box body which is provided with a mounting panel; the battery module is placed in the inner cavity of the box body; the elastic structure is arranged between the mounting panel and the battery module, the elastic structure comprises a pressing plate and an elastic piece, and the two ends of the elastic piece abut against the pressing plate and the mounting panel respectively. After the elastic piece and the battery module are installed, the elastic piece is in a pre-pressing state and provides pushing force towards the direction where the battery module is located for the pressing plate, pre-tightening force formed by pre-pressing of the elastic piece counteracts battery cell expansion force of the battery module, mechanical damage caused by too large expansion force of the battery cell is effectively reduced, meanwhile, the heat dissipation effect in the roll core is better, and the service life of the roll core is prolonged. Furthermore, more square-shell battery cells can be accommodated in the mode of the elastic structure module, and meanwhile, the cost of a battery cell structural part is reduced, so that the battery pack has higher product competitiveness.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the battery package technical field, and specifically relates to a battery package capable of absorbing battery cell expansion. BACKGROUND

[0002] In the design of traditional square shell battery cells or soft package battery cells, due to the inherent structural characteristics, the battery cells tend to produce expansion force due to internal chemical reactions during charging and discharging. Such expansion force can cause the battery cells to self-discharge intensively and cause voltage drop within a normal use cycle, ultimately shortening the service life of the battery cells.

[0003] To solve this problem, the common practice is to add foam material between the battery cells to absorb the expansion force, but the presence of the foam material occupies part of the space of the battery module, thereby reducing the overall energy density, and under long-term use, the foam material can age, compress and deform, or lose elasticity, resulting in weakened buffering effect and inability to continuously and effectively absorb the expansion force. SUMMARY

[0004] The utility model is directed to the above-mentioned problems existing in the prior art and proposes a battery package capable of accommodating more square shell battery cells and continuously and effectively absorbing battery cell expansion.

[0005] The utility model can be implemented through the following technical solutions:

[0006] A battery package capable of absorbing battery cell expansion includes:

[0007] A box body having a mounting panel;

[0008] A battery module placed in the inner cavity of the box body;

[0009] An elastic structure arranged between the mounting panel and the battery module, wherein

[0010] The elastic structure includes a pressing plate and an elastic member, and the two ends of the elastic member are respectively in abutment with the pressing plate and the mounting panel.

[0011] When the elastic member and the battery module are installed, the elastic member is in a pre-pressed state and provides a pushing force of the pressing plate towards the direction in which the battery module is located, and the pre-tightening force formed by the pre-pressing of the elastic member offsets the expansion force of the battery cell of the battery module.

[0012] As a further improvement of the utility model, the box body has two mounting panels in front and back, and at least one elastic structure is arranged between the mounting panel and the battery module.

[0013] As a further improvement of the utility model, the pressing plate or the mounting panel is further provided with a limiting column, and the limiting column is used for preventing the battery module from being over-pressed due to excessive inertia.

[0014] As a further improvement of the utility model, the elastic member is a spring, and the spring is mounted on the pressing plate or the mounting panel.

[0015] As a further improvement of the utility model, the spring is mounted on the pressing plate or the mounting panel through a positioning column or a nested connection.

[0016] As a further improvement of the utility model, the spring is mounted on the pressing plate or the mounting panel through a pressing strip lock screw structure.

[0017] As a further improvement of the utility model, the mounting panel is provided with a spherical connecting column, and an outer end of the spherical connecting column is provided with a universal ball head.

[0018] As a further improvement of the utility model, the pressing plate is provided with a connecting seat, and the connecting seat is provided with a rotating groove for embedding the universal ball head.

[0019] As a further improvement of the utility model, the utility model further comprises an upper cover, which covers a top surface of the box body and is connected through a fastener, and a sealing ring is arranged between the upper cover and the box body.

[0020] As a further improvement of the utility model, a foam fireproof plate is arranged between the top surface of the battery module and the upper cover.

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

[0022] 1. When the elastic member and the battery module are installed, the elastic member is in a pre-pressed state and provides a pushing force of the pressing plate towards the direction of the battery module, the pre-tightening force formed by the pre-pressing of the elastic member offsets the cell expansion force of the battery module, effectively reduces the mechanical damage of the cell caused by the excessive expansion force, and the heat dissipation effect inside the winding core is better, thereby improving the cycle life of the cell;

[0023] 2. The elastic structure module can accommodate more square shell cells, and the cost of the cell structure is reduced, so that the battery pack has more product competitiveness;

[0024] 3. The pressing plate or the mounting panel is further provided with a limiting column, and the limiting column is used for preventing the battery module from being over-pressed due to excessive inertia, that is, the limiting column can limit the movement of the battery module due to inertia, avoid the battery module from bearing pressure exceeding the design range, and thereby protect the cell from being damaged;

[0025] 4. A connecting structure can be added between the mounting panel and the pressing plate, which is matched by the spherical connecting column and the connecting seat. The design allows the pressing plate to have a certain degree of rotational freedom in three-dimensional space. When the battery cell expands, the pressing plate can adapt to the change of the battery cell through the rotation of the universal ball head, so as to ensure that the spring structure can uniformly apply the pre-tightening force to the battery cell, avoid the damage of the battery cell caused by uneven local stress, and the design of the universal ball head allows the spherical connecting column to have a certain degree of rotational freedom. This degree of freedom allows the pressing plate to be properly rotated and adjusted when the battery cell expands or shrinks, thereby providing better elastic support for the expansion of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is the explosion schematic diagram of the battery pack capable of absorbing the expansion of the battery cell in the embodiment one of the utility model;

[0027] Figure 2 is the structure schematic diagram of the elastic structure and the mounting panel when the spring is installed through the positioning column in the embodiment one of the utility model;

[0028] Figure 3 is the structure schematic diagram of the elastic structure and the mounting panel when the spring is installed through the nested connecting structure in the embodiment one of the utility model;

[0029] Figure 4 is the Figure 3 partial enlarged view of A in the embodiment one of the utility model;

[0030] Figure 5 is the structure schematic diagram of the battery pack after assembly in the embodiment one of the utility model;

[0031] Figure 6 is the structure schematic diagram of the battery pack capable of absorbing the expansion of the battery cell in the embodiment two of the utility model;

[0032] Figure 7 is the structure schematic diagram of the elastic structure and the mounting panel in the embodiment three and the embodiment four of the utility model;

[0033] Figure 8 is the Figure 7 partial enlarged view of A in the embodiment three and the embodiment four of the utility model;

[0034] Figure 9 is the structure schematic diagram of the elastic structure and the mounting panel after assembly in the embodiment three and the embodiment four of the utility model;

[0035] Figure 10 is the Figure 9 partial enlarged view of B in the embodiment three and the embodiment four of the utility model.

[0036] In the diagram, 100 is the housing; 110 is the mounting panel; 120 is the spherical connecting column; 121 is the universal ball joint; 200 is the battery module; 210 is the limiting column; 220 is the positioning column; 230 is the nested connection structure; 300 is the pressure plate; 310 is the spring; 320 is the pressure strip threaded structure; 321 is the arc surface; 330 is the connecting seat; 321 is the rotating groove; 400 is the top cover; 500 is the sealing ring; and 600 is the foam fireproof board. Detailed Implementation

[0037] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. The technical methods of the present invention will be further described, but the present invention is not limited to these embodiments.

[0038] Example 1

[0039] like Figures 1-5 As shown, this utility model provides a battery pack that can absorb cell expansion, comprising:

[0040] The enclosure 100 has a mounting panel 110;

[0041] The battery module 200 is placed inside the cavity of the housing 100;

[0042] A flexible structure is disposed between the mounting panel 110 and the battery module 200, wherein...

[0043] The elastic structure includes a pressure plate 300 and an elastic element, with both ends of the elastic element abutting against the pressure plate 300 and the mounting panel 110, respectively.

[0044] Specifically, after the elastic element and battery module 200 are installed, the elastic element is in a pre-compression state and provides the pressure plate 300 with a pushing force in the direction of the battery module 200. The pre-tightening force formed by the pre-compression of the elastic element counteracts the cell expansion force of the battery module 200, effectively reducing the mechanical damage to the cell caused by excessive expansion force. At the same time, the heat dissipation effect inside the core is better, thereby improving the cycle life of the cell.

[0045] In addition, this flexible structural module approach can accommodate more prismatic cells while reducing the cost of cell structural components, making the battery pack more competitive.

[0046] In other words, by introducing an elastic structure to absorb the expansion force of the battery cell, not only is the problem of battery cell expansion solved and the cycle life of the battery cell improved, but the overall performance and economy of the battery pack are also improved.

[0047] Preferably, the pressing plate 300 or the mounting panel 110 is also provided with a limiting column 210, which is used to prevent the battery module 200 from being over-pressed due to excessive inertia, that is, the limiting column 210 can play a limiting role when the battery module 200 moves due to inertia, avoiding the battery module 200 from bearing pressure exceeding the design range, thereby protecting the battery cell from damage.

[0048] Preferably, the elastic member is provided as a spring 310, which is a common elastic element and has good elasticity and recovery ability, and is suitable for absorbing the force generated by the expansion of the battery cell.

[0049] The spring 310 is installed on the pressing plate 300 or the mounting panel 110 through the positioning column 220 or the nested connection structure 230, wherein the spring 310 nested support structure can completely support the spring 310, and the connection between the spring 310 and the pressing plate 300 or the mounting panel 110 can be achieved by rotating the spring 310, without the need for additional fixing members, which not only reduces the number of parts, but also simplifies the installation process, thereby saving the process cost.

[0050] Preferably, it also includes an upper cover 400, which covers the top surface of the box body 100 and is connected through fasteners, and a sealing ring 500 is arranged between the upper cover 400 and the box body 100, which significantly improves the protection level (such as IP level) of the battery pack, making it suitable for more harsh working environments, such as outdoor, humid or dusty environments.

[0051] Preferably, a foam fireproof plate 600 is arranged between the top surface of the battery module 200 and the upper cover 400, which can serve as a fire barrier to prevent the spread of fire caused by the battery cell failure to the outside of the battery pack. This design helps to improve the safety of the entire battery pack and reduce the risk of fire, and the foam material itself has good shock absorption performance, which can absorb external impact or vibration and reduce the direct impact on the battery cell.

[0052] Embodiment Two

[0053] As shown in Figure 6 Embodiment Two differs from Embodiment One in that the box body 100 of Embodiment Two is provided with two groups of elastic structures, which are respectively located at the front and rear ends of the battery module 200, so that the battery module 200 can obtain the support of pre-tightening force in the front-rear direction. This bidirectional pre-tightening force can more effectively offset the bidirectional expansion force generated by the battery cell during charging and discharging.

[0054] In addition, the elastic members at the front and rear ends can jointly bear the expansion force of the battery cell, and compared with the single-sided elastic member, the load borne by each group of elastic members is relatively small, so that the elastic performance of each group of elastic members can be maintained more durably without being easily fatigued or failed.

[0055] Furthermore, the elastic structure at both ends can provide more stable support, reducing the displacement of the battery module 200 in dynamic environments. Especially during vehicle operation, it can better maintain the positional stability of the battery module 200 and avoid additional stress caused by vibration or impact.

[0056] Example 3

[0057] like Figures 7-9 As shown, the difference between Embodiment 3 and Embodiments 1 and 2 is that the spring 310 in Embodiment 3 is mounted on the pressure plate 300 or the mounting panel 110 through the pressure bar locking thread structure 320. The pressure bar locking thread structure 320 has an outwardly protruding arc-shaped surface 321, which plays a supporting and positioning role for the installation of the spring 310.

[0058] Example 4

[0059] like Figures 7-10 As shown, the difference between Embodiment 4 and Embodiments 1 and 2 is that Embodiment 4 has a spherical connecting post 120 on the mounting panel 110, the outer end of the spherical connecting post 120 is set as a universal ball head 121, and the pressure plate 300 is provided with a connecting seat 330, which has a rotating groove 331 for the universal ball head 121 to be inserted.

[0060] This design allows the pressure plate 300 a certain degree of rotational freedom in three-dimensional space. Therefore, when the battery cell expands, the pressure plate 300 can adapt to the changes in the battery cell by rotating the universal ball joint 121, thereby ensuring that the spring 310 structure can apply preload to the battery cell evenly and avoid damage to the battery cell caused by uneven local force.

[0061] Furthermore, the design of the universal ball joint 121 allows the spherical connecting post 120 to have a certain degree of rotational freedom. This degree of freedom allows the pressure plate 300 to be appropriately rotated and adjusted when the battery cell expands or contracts, providing better elastic support for the battery cell expansion.

[0062] The technical means disclosed in this utility model are not limited to those described above, but also include technical solutions composed of any combination of the above technical features. The above are specific embodiments of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

[0063] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0064] In addition, the descriptions such as "first", "second", "one", etc. in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0065] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing", etc. should be understood broadly, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be internal communication of two elements or mutual action relationship of two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0066] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0067] The technical means disclosed by the present application scheme is not limited to the technical means disclosed by the above technical means, but also includes the technical solutions composed of any combination of the above technical features. The above is the specific embodiment of the present application, it should be pointed out that for ordinary skilled in the art, without departing from the principle of the present application, some improvements and refinements can be made, these improvements and refinements are also considered as the protection scope of the present application.

[0068] It should be noted that all directional indications in the present application embodiment (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (such as shown in the drawings), if the specific posture changes, the directional indication also changes accordingly.

[0069] In addition, the descriptions such as "first", "second", "one" and the like in the present application are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0070] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be broadly understood, for example, "fixing" can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0071] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the present application.

Claims

1. A battery pack that can absorb swelling of a battery cell, characterized by, The application relates to a battery module installation structure, which comprises: a box body with installation panels; a battery module placed in the inner cavity of the box body; an elastic structure arranged between the installation panels and the battery module, wherein the elastic structure comprises a pressing plate and an elastic piece, and the two ends of the elastic piece are respectively in abutment with the pressing plate and the installation panel; when the elastic piece and the battery module are installed, the elastic piece is in a pre-pressing state and provides a pushing force of the pressing plate towards the direction where the battery module is located, and the pre-tightening force formed by the pre-pressing of the elastic piece offsets the cell expansion force of the battery module.

2. The battery pack of claim 1, wherein, The box body has two front and rear installation panels, and at least one elastic structure is arranged between the installation panel and the battery module.

3. The battery pack of claim 1, wherein, A limiting column is further arranged on the pressing plate or the installation panel, and the limiting column is used for preventing the battery module from being over-pressed due to excessive inertia.

4. The battery pack of claim 1, wherein, The elastic piece is arranged as a spring, and the spring is installed on the pressing plate or the installation panel.

5. The battery pack of claim 4, wherein, The spring is installed on the pressing plate or the installation panel through a positioning column or a nested connection structure.

6. The battery pack of claim 4, wherein, The spring is installed on the pressing plate or the installation panel through a pressing strip locking screw structure.

7. The battery pack of claim 2, wherein, The installation panel is provided with a spherical connecting column, and the outer end of the spherical connecting column is arranged as a universal ball head.

8. The battery pack of claim 7, wherein, The pressing plate is provided with a connecting seat, and the connecting seat is provided with a rotating groove for embedding the universal ball head.

9. The battery pack of claim 1, wherein, The application further comprises an upper cover which covers the top surface of the box body and is connected through fasteners, and a sealing ring is arranged between the upper cover and the box body.

10. The battery pack of claim 9, wherein, A foam fireproof plate is arranged between the top surface of the battery module and the upper cover.

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