Energy absorption end plate and battery module

Abstract

The utility model belongs to the technical field of batteries, and discloses an energy absorption end plate and a battery module. The energy-absorbing end plate is provided with an end plate body, a buffer structure and a fixing structure, the buffer structure is arranged on one side, far away from a battery cell, of the end plate body, the buffer structure is provided with a connecting end connected to the end plate body, and the fixing structure is connected to the buffer structure and spaced from the connecting end; and the fixing structure can limit the moving distance of the end plate body along the direction in which the battery cell extrudes the end plate body. When the end plate body bears expansive force from the battery cell, the part, located between the fixing structure and the connecting end, of the buffering structure can enable the end plate body to move in the direction close to the fixing structure in a deformation mode, the space, capable of being used for expansion, of the battery cell is increased, and therefore the expansive force applied to the energy absorption end plate by the battery cell is reduced; and the phenomenon that the energy absorption end plate is extruded and damaged is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an energy-absorbing end plate and a battery module. Background Art

[0002] As one of the main components of electric vehicles, power batteries are used to provide power for electric vehicles. With the development of electric vehicles, the safety and energy density of power batteries have attracted much attention. In order to improve the energy density and volume utilization, it is generally considered to increase the size of the battery module to fit more cells.

[0003] Traditional large battery modules are generally designed with end plate structures and side plates. The end plate structure is generally an aluminum extruded profile. When the battery cell expands under a high SOC (State of Charge) state, due to the strong rigidity of the aluminum extruded profile, the end plate structure cannot deform and absorb the expansion force of the battery cell, which makes the end plate structure easily squeezed and damaged, affecting the normal use of the power battery.

[0004] Based on the above, an energy absorbing end plate and a battery module are urgently needed to solve the above technical problems. Utility Model Content

[0005] One purpose of the utility model is to provide an energy absorbing end plate, so as to improve the situation that the existing end plate structure is damaged by extrusion, and facilitate the normal use of the power battery.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Energy absorbing end plate, comprising:

[0008] An end plate body, the end plate body is mounted on the end of the battery module, and one side of the end plate body abuts against the battery cell of the battery module;

[0009] A buffer structure is arranged on the other side of the end plate body, and the buffer structure has a connection end connected to the end plate body;

[0010] a fixing structure, the fixing structure being connected to the buffer structure and spaced apart from the connecting end;

[0011] The energy absorbing end plate is configured such that when the battery cell expands in a direction of squeezing the end plate body, the buffer structure can be deformed to cause the end plate body to move in a direction close to the fixed structure, and the fixed structure can limit the movement distance of the end plate body.

[0012] Preferably, the buffer structure includes a first section, one end of the first section is connected to the end plate body, the other end of the first section is extended in a direction away from the end plate body, and the fixing structure is connected to the other end of the first section or is arranged in the first section.

[0013] A buffer gap is defined between the first section and the end plate body, and the buffer gap is configured to be reduced when the battery cell expands so that the end plate body moves in a direction close to the fixed structure; and / or,

[0014] The first section can be bent and deformed between one end and the other end so that the end plate body moves in a direction approaching the fixed structure.

[0015] Preferably, the battery module is fixedly mounted on the battery pack, and the fixing structure is rotatably connected to the battery pack housing of the battery pack via a fastener; and / or,

[0016] The end plate body has two oppositely arranged ends, each of which is provided with the buffer structure and the fixing structure, and the buffer structure and the fixing structure located at one end are arranged in mirror symmetry with the buffer structure and the fixing structure located at the other end.

[0017] Preferably, the battery module also includes a side connecting member, and the buffer structure includes a second section, which is arranged along a first preset direction of the end plate body, and the second section protrudes from the end plate body and is connected to the side connecting member, so that the side connecting member is spaced apart from the end of the end plate body.

[0018] Preferably, the side connecting member includes a side plate, the other end of the second section is located between the end of the side plate and the end plate body, and the end of the side plate can be connected to the other end of the second section so that the end plate body limits the battery cell.

[0019] Preferably, the energy-absorbing end plate further comprises a limiting structure, wherein the limiting structure is connected to the buffer structure, and the limiting structure can abut against the end plate body to limit a minimum distance between the buffer structure and the end plate body.

[0020] Preferably, the side connector includes a fastening band, the other end of the second section is located between the fastening band and the end plate body, and the fastening band can abut against the second section and / or the fixing structure to press the end plate body against the battery cell.

[0021] Preferably, a limiting portion is further provided on a side of the second section away from the end plate body, and the limiting portion is used to limit the position of the tightening belt.

[0022] Preferably, the second section is arranged parallel to the end plate body.

[0023] Another object of the present invention is to provide a battery module to improve the situation where the existing end plate structure is squeezed and damaged, which is conducive to the normal use of the power battery.

[0024] To achieve this purpose, the utility model adopts the following technical solutions:

[0025] A battery module includes a battery cell and the energy absorbing end plate as described above.

[0026] The beneficial effect of the utility model is to provide an energy-absorbing end plate and a battery module having the same, wherein the energy-absorbing end plate has an end plate body and a buffer structure, wherein the buffer structure is arranged on a side of the end plate body away from the battery cell and the connecting end of the buffer structure is connected to the end plate body, and the buffer structure is provided with a fixed structure capable of limiting the end plate body, when the end plate body is subjected to the expansion force from the battery cell, the portion of the buffer structure located between the fixed structure and the connecting end can be deformed so that the end plate body can move in a direction close to the fixed structure, and the space available for expansion of the battery cell is increased, thereby reducing the expansion force applied by the battery cell to the energy-absorbing end plate, thereby avoiding the phenomenon of the energy-absorbing end plate being squeezed and damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional diagram of the energy-absorbing end plate in the utility model;

[0028] Figure 2 This is a side view comparison diagram of the energy absorbing end plate in the utility model before and after being subjected to the expansion force of the battery core;

[0029] Figure 3 This is a schematic diagram of the structure of a battery module in one embodiment of the utility model;

[0030] Figure 4 It is a structural schematic diagram of a battery module in another embodiment of the utility model.

[0031] Description of Figure Numbers:

[0032] 1. Battery cell; 2. Energy-absorbing end plate; 21. End plate body; 22. Buffer structure; 221. First section; 222. Second section; 23. Limiting structure; 24. Limiting groove; 25. Fixing structure; 251. Connection hole; 3. Side plate; 31. Clamping part; 4. Fastening belt; A. Buffer angle; D. Thickness dimension. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

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

[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] The following is based on the attached Figure 1 To Attachment Figure 4 The energy absorbing end plate 2 and the battery module provided by the utility model are introduced.

[0038] like Figure 1 As shown, the energy absorbing end plate 2 mainly includes an end plate body 21 and a buffer structure 22. The end plate body 21 is designed to be installed at the end of the battery module, and one side of the end plate body 21 is used to abut against the battery cell 1 of the battery module to absorb the battery cell 1 along the thickness direction of the energy absorbing end plate 2 (i.e. Figure 1The buffer structure 22 is arranged on the other side of the end plate body 21, the connection end of the buffer structure 22 is connected to the end plate body 21, and a fixing structure 25 is arranged on the buffer structure 22, the fixing structure 25 is used to limit the battery module to the battery pack, and the fixing structure 25 is arranged at a certain distance from the connection end.

[0039] Figure 2 The side view comparison diagram of the energy absorbing end plate 2 before and after the expansion force of the battery cell 1 is shown in FIG. Figure 2 The left side is before the expansion force of the battery cell 1, and the right side is after the expansion force of the battery cell 1. Figure 2 As shown, when the battery cell 1 expands, the portion of the buffer structure 22 between the fixed structure 25 and the connection end can be deformed. This deformation mechanism enables the end plate body 21 to move in a direction close to the fixed structure 25, and the fixed structure 25 can limit the movement distance of the end plate body 21, thereby limiting the end plate body 21 and the battery cell 1 while increasing the space in the battery module for accommodating the battery cell 1. After the space is increased, the expansion force applied by the battery cell 1 to the energy-absorbing end plate 2 will be reduced, thereby avoiding the phenomenon of the energy-absorbing end plate 2 being squeezed and damaged when the battery cell 1 expands.

[0040] The utility model provides an energy-absorbing end plate 2, which has an end plate body 21 and a buffer structure 22. The buffer structure 22 is arranged on a side of the end plate body 21 away from the battery cell 1 and the connecting end of the buffer structure 22 is connected to the end plate body 21. The buffer structure 22 is provided with a fixed structure capable of limiting the end plate body 21. When the end plate body 21 is subjected to the expansion force from the battery cell 1, the portion of the buffer structure 22 located between the fixed structure 25 and the connecting end can be deformed so that the end plate body 21 can move in a direction close to the fixed structure 25. The space available for expansion of the battery cell 1 is increased, thereby reducing the expansion force applied by the battery cell 1 to the energy-absorbing end plate 2, thereby avoiding the phenomenon that the energy-absorbing end plate 2 is squeezed and damaged.

[0041] like Figure 2 As shown, in this embodiment, the buffer structure 22 adopts a bent plate, and the bent plate includes a first section 221. One end of the first section 221 is connected to the end plate body 21 (i.e., the above-mentioned connecting end), and the other end of the first section 221 is extended in a direction away from the end plate body 21, so that a buffer gap is formed between the first section 221 and the end plate body 21. The fixed structure 25 is connected to the first section 221. When the battery cell 1 expands and squeezes the end plate body 21, the end plate body 21 moves in a direction close to the fixed structure 25, and the buffer gap will be compressed in the direction from the battery cell 1 to the fixed structure 25, so that the battery cell 1 has more space for collision, reducing the expansion force applied by the battery cell 1 to the energy-absorbing end plate 2.

[0042] More intuitively, when there is no expansion force, a buffer angle A is defined between the first section 221 and the end plate body 21. When the battery cell 1 expands, the portion of the first section 221 connected to the end plate body 21 is deformed, so that the buffer angle A is reduced, so that the end plate body 21 can move in a direction close to the other end of the buffer structure 22, providing a certain space for the expansion of the battery cell 1.

[0043] Of course, in the process of reducing the buffer angle A, according to the bending resistance of the first section 221 itself, the first section 221 may bend and deform. This phenomenon will also reduce the area between the first section 221 and the end plate body 21, and is also a manifestation of the buffer gap being compressed along the direction from the battery cell 1 to the fixed structure 25. It can also reduce the expansion force applied by the battery cell 1 to the energy absorbing end plate 2, thereby protecting the energy absorbing end plate 2 from damage.

[0044] Optionally, in some embodiments, only the portion of the first section 221 connected to the end plate body 21 (i.e., rotating around the connecting end) may have the ability to deform, or only the portion between one end and the other end of the first section 221 may have the ability to deform. These can achieve the effect of reducing the expansion force of the battery cell 1 exerted on the energy-absorbing end plate 2, and are also within the scope of protection of the present utility model.

[0045] Of course, it should be noted that, in the present invention, the deformation capacity of the portion of the first section 221 connected to the end plate body 21, and the deformation capacity between one end and the other end of the first section 221, all refer to elastic deformation. The elastic deformation enables the energy-absorbing end plate 2 to maintain contact with the battery cell 1 while being limited by the fixing structure 25, thereby achieving the effect of limiting and fixing the battery cell 1.

[0046] It can be understood that the elastic deformation ability is affected by factors such as the material, thickness dimension D, and shape structure of the first section 221. The material of the first section 221 can be made of the same material as the existing fixed end plate, which can be either a metal material or an engineering plastic. The present utility model does not impose too many restrictions on this, as long as the first section 221 has the elastic deformation ability. The thickness dimension D factor of the first section 221 is specifically manifested as follows: the larger the thickness dimension D of the first section 221, the greater the expansion force required for deformation. The shape and structure factor of the first section 221 is specifically manifested as follows: the more hollow structures such as hollow grooves are provided in the first section 221, the smaller the expansion force required for deformation. Therefore, those skilled in the art can reasonably set the material and thickness dimension D of the first section 221 according to the requirements of the energy-absorbing end plate 2 for limiting and fixing the battery cell 1 and the need to avoid extrusion damage itself.

[0047] Specifically, in the present invention, the fixing structure 25 can limit the moving distance of the end plate body 21 in a variety of ways.

[0048] Exemplarily, the battery module further includes fasteners, such as bolts, locating pins, etc., and the fixing structure 25 is used to connect the fasteners. The fasteners are used to fix the battery module to the battery pack housing of the battery pack. Exemplarily, referring to Figure 1 , Figure 2 As shown, the fixing structure 25 has a connecting hole 251, and the fastener is a fixing bolt, which can pass through the connecting hole 251 and be threadedly connected to the battery pack shell to assemble the battery module and the battery pack shell to form a battery pack.

[0049] Preferably, the fixing structure 25 is rotatably fixedly connected to the battery pack by means of fasteners. When the battery cell 1 applies an expansion force to the end plate body 21, the buffer structure 22 is deformed, and at this time, the fixing structure 25 can rotate to a certain extent around the circumferential direction of the fastener, and the center position of the connecting hole 251 is fixed relative to the battery pack shell, thereby further improving the buffering energy absorption effect. Of course, in other embodiments, the fixing structure 25 can also be directly fixed to the battery pack shell by means of welding connection, snap connection, etc., and this is not specifically limited in the present utility model, as long as it can achieve the effect of buffering energy absorption.

[0050] Furthermore, in some embodiments, the fixed structure 25 can also be installed on the battery pack shell by means of a sliding connection to further enhance the effect of buffering and energy absorption. Exemplarily, a slide rail is provided on the battery pack shell, and the slide rail is provided in a direction perpendicular to the expansion force exerted on the end plate body 21, and the fixed structure 25 is provided to slide along the slide rail. When the battery cell 1 expands and squeezes the end plate body 21, the fixed structure 25 can be displaced in a direction perpendicular to the expansion force exerted on the end plate body 21 while limiting the movement distance of the end plate body 21, thereby further increasing the upper limit of the distance that the end plate body 21 can move under the same expansion force, thereby enhancing the buffering and energy absorption capability of the energy-absorbing end plate 2.

[0051] Preferably, at the two opposite ends of the end plate body 21, each end is provided with a buffer structure 22 and a fixed structure 25, and the buffer structures 22 and the fixed structures 25 on the two ends are arranged in mirror symmetry to prevent the end plate body 21 from tilting during buffering and energy absorption, resulting in uneven force on the end plate body 21, excessive local force, and pressure loss. Of course, in some other embodiments, more buffer structures 22 and fixed structures 25 can also be provided. The utility model does not specifically limit the number and location of the buffer structures 22 and fixed structures 25, as long as they can play the role of buffering and energy absorption to protect the end plate body 21.

[0052] Reference Figure 2 , Figure 3 As shown, the battery module also includes a side connector, and the buffer structure 22 also includes a second section 222 for connecting the side connector. One end of the second section 222 is connected to the other end of the first section 221, and along the first preset direction (i.e. Figure 1 The first preset direction is perpendicular to the thickness direction), and the other end of the second section 222 protrudes from the end of the end plate body 21 and is connected to the side connector, so that a certain distance is maintained between the side connector and the end plate body 21. This design can ensure that the end plate body 21 does not rub against the side connector during the movement of the end plate body 21, ensure the smooth movement of the end plate body 21 during the expansion of the absorbing battery cell 1, and avoid the phenomenon that the end of the end plate body 21 abuts against the side connector and cannot move, resulting in the bending deformation and damage of the end plate body 21. Therefore, the second section 222 can further reduce the possibility of damage to the end plate body 21.

[0053] Preferably, in this embodiment, the second section 222 is arranged parallel to the end plate body 21, so as to further reduce the installation dimensions required for the battery module in the battery pack along the thickness direction of the end plate body 21 on the basis of avoiding friction and damage to the end plate body 21. Exemplarily, the second section 222 is connected to the first section 221 and arranged at an angle so that the second section 222 can be parallel to the end plate body 21. Compared with the first section 221 being extended to separate the end of the end plate body 21 from the side connector, the second section 222 can abut against the side connector and reduce the thickness of the entire energy-absorbing end plate 1 in the thickness direction of the end plate body 21, which can reduce the installation dimensions required for the battery module.

[0054] It should be noted that, in the present embodiment, the fixing structure 25 can be directly set on the first section 221 or directly set on the second section 222. Since the first section 221 and the second section 222 are directly connected, when the buffer structure 22 includes the first section 221 and the second section 222, the fixing structure 25 is in a structural relationship of being directly connected to one of the two and indirectly connected to the other, and can always play the role of limiting the moving distance of the end plate body 21.

[0055] like Figure 3As shown, in one embodiment of the utility model, when the side connecting member uses the side plate 3, along the first preset direction, the other end of the second section 222 is located between the side plate 3 and the end plate body 21, and the end of the side plate 3 can abut against the other end of the second section 222, so that the side plate 3 is limitedly connected with the energy-absorbing end plate 2, and the battery cell 1 is limited. Specifically, a clamping structure is provided at the end of the side plate 3, and the clamping structure includes a clamping portion 31, and the second section 222 can abut against the clamping portion 31 along the direction of the expansion force exerted on the energy-absorbing end plate 2, and abut against the side plate 3 along the above-mentioned first preset direction, that is, forming an abutment limit with the clamping portion 31 in the opposite direction of the expansion force, so that the side plate 3 and the energy-absorbing end plate 2 are connected by clamping.

[0056] When the battery cell 1 expands, the side panel 3 is connected to the buffer structure 22 by abutting. When the battery cell 1 applies an expansion force to the end plate body 21, the side panel 3 will also be deformed due to the deformation of the buffer structure 22. Specifically, in the embodiment in which the above-mentioned fixed structure 25 is rotatably connected to the battery pack shell, when the fixed structure 25 rotates, the limiting structure 23 will also change its position and angle, so that the end of the side panel 3 is subjected to pressure away from the fixed structure 3. The side panel 3 will deform to resist the pressure, and this deformation force can also help the buffer structure 22 to buffer and absorb energy, which is beneficial to further protect the end plate body 21, thereby avoiding the phenomenon that the energy-absorbing end plate 2 is squeezed and damaged when the battery cell 1 expands.

[0057] Of course, in some other embodiments, other fixing methods such as fastener connection and bonding can also be used to connect the side plate 3 to the energy absorbing end plate 2, as long as the end plate body 21 can be moved while the battery cell 1 is limited and fixed. It can be understood that detachable connection methods such as snap connection can further facilitate the disassembly and maintenance of structures such as the battery cell 1, the side plate 3, and the energy absorbing end plate 2.

[0058] Alternatively, if Figure 4As shown, in some embodiments, the side connector uses a fastening belt 4, and the other end of the second section 222 is located between the fastening belt 4 and the end plate body 21. The fastening belt 4 is annular and is installed by a pre-tightening process, that is, the energy-absorbing end plate 2 is installed on the inner side of the fastening belt 4 through a clamping device, so that when the battery cell 1 does not expand, the fastening belt 4 can abut against the second section 222, thereby pressing the end plate body 21 against the battery cell 1, so that the energy-absorbing end plate 2 can limit and fix the battery cell 1. When the battery cell 1 expands, the fastening belt 4 limits the position of the end of the buffer structure 22, and the battery cell 1 applies an expansion force to the end plate body 21. Under the action of the battery cell 1 and the fastening belt 4, the buffer structure 22 will be deformed, and the end plate body 21 can move in a direction close to the other end of the buffer structure 22, thereby increasing the space for accommodating the battery cell 1 in the battery module box. After the space is enlarged, the expansion force exerted by the battery core 1 on the energy-absorbing end plate 2 will be reduced, thereby avoiding the phenomenon that the energy-absorbing end plate 2 is squeezed and damaged when the battery core 1 expands.

[0059] Preferably, a limiting portion is further provided on one side of the second section 222 away from the end plate body 21, and the limiting portion is used to limit the fastening belt 4 to prevent the fastening belt 4 from moving along the second preset direction (i.e. Figure 1 The buffer structure 22 is moved in the Z-axis direction (as shown in FIG. 1 ), thereby causing the buffer structure 22 to deform unevenly and affecting the buffer effect. For example, in this embodiment, the limiting portion is provided with a limiting groove 24, and the limiting groove 24 is provided on the side of the second section 222 away from the end plate body 21. After the fastening belt 4 is installed, part of the fastening belt 4 can be embedded in the limiting groove 24, thereby realizing the limiting setting of the fastening belt 4.

[0060] Optionally, in the present embodiment, the energy-absorbing end plate 2 further includes a limiting structure 23, and the limiting structure 23 can abut against the end plate body 21 to limit the minimum distance between the buffer structure 22 and the end plate body 21. Specifically, the limiting structure 23 is disposed at the other end of the second section 222, and is disposed to protrude from the second section 222 in the direction toward the end plate body 21. When the end plate body 21 moves toward the fixed structure 25, the limiting structure 23 can abut between the buffer structure 22 and the end plate body 21, thereby limiting the minimum distance between the buffer structure 22 and the end plate body 21 and preventing the buffer structure 22 from deforming and breaking. Of course, in some other embodiments, the limiting structure 23 can also be disposed in the first section 221 or the end plate body 21. As long as it can play the role of limiting the minimum distance between the buffer structure 22 and the end plate body 21, it belongs to the scope to be protected by the present utility model.

[0061] The utility model also provides a battery module, which includes a battery core 1 and the energy absorbing end plate 2. Figure 3 , Figure 4As shown, the battery module further includes a side connector, which is connected to the energy-absorbing end plate 2 to form a battery module box, in which the battery cell 1 is fixedly arranged, and the end plate body 21 of the energy-absorbing end plate 2 can move in a direction away from the battery cell 1 when the battery cell 1 expands, thereby increasing the space in the battery module box for accommodating the battery cell 1. After the space is increased, the expansion force applied by the battery cell 1 to the energy-absorbing end plate 2 will be reduced, thereby avoiding the phenomenon that the energy-absorbing end plate 2 is squeezed and damaged when the battery cell 1 expands.

[0062] Optionally, in this embodiment, the battery module box includes two energy absorbing end plates 2, between which a battery cell 1 is sandwiched, and the side connector is limitedly connected to the two energy absorbing end plates 2. When the battery cell 1 expands, the end plate bodies 21 of the two energy absorbing end plates 2 will move along the thickness direction of the energy absorbing end plates 2, thereby significantly increasing the space in the battery module box for accommodating the battery cell 1, reducing the expansion force applied by the battery cell 1 to the energy absorbing end plates 2, and protecting the energy absorbing end plates 2 from being squeezed and damaged.

[0063] Of course, in some embodiments, only one energy-absorbing end plate 2 may be provided. Exemplarily, the battery module housing includes an energy-absorbing end plate 2 and a fixed end plate (i.e., an existing end plate structure), a battery cell 1 is sandwiched between the energy-absorbing end plate 2 and the fixed end plate, and the side connector is limitedly connected to the buffer structure 22 of the energy-absorbing end plate 2, and is fixedly connected or limitedly connected to the fixed end plate by means of fasteners, adhesive connections, snap connections, etc. When the battery cell 1 expands, the end plate body 21 of the energy-absorbing end plate 2 will move, thereby increasing the space in the battery module housing for accommodating the battery cell 1, reducing the expansion force applied by the battery cell 1 to the energy-absorbing end plate 2 and the fixed end plate, and protecting the energy-absorbing end plate 2 and the fixed end plate from being squeezed and damaged.

[0064] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Energy absorbing end plate, characterized in that: include: An end plate body (21), the end plate body (21) being mounted on an end of a battery module, and one side of the end plate body (21) being in contact with a battery cell (1) of the battery module; A buffer structure (22) is arranged on the other side of the end plate body (21), and the buffer structure (22) has a connection end connected to the end plate body (21); a fixing structure (25), the fixing structure (25) being connected to the buffer structure (22) and spaced apart from the connecting end; The energy-absorbing end plate (2) is configured such that, when the battery cell (1) expands in a direction to squeeze the end plate body (21), the buffer structure (22) can be deformed so that the end plate body (21) moves in a direction close to the fixed structure (25), and the fixed structure (25) can limit the moving distance of the end plate body (21).

2. The energy absorbing end plate according to claim 1, characterized in that: The buffer structure (22) comprises a first section (221), one end of the first section (221) is connected to the end plate body (21), the other end of the first section (221) is extended in a direction away from the end plate body (21), the fixing structure (25) is connected to the other end of the first section (221) or is arranged on the first section (221), A buffer gap is defined between the first section (221) and the end plate body (21), and the buffer gap is configured to decrease when the battery cell (1) expands, so that the end plate body (21) moves in a direction close to the fixed structure (25); and / or, The first section (221) can be bent and deformed between one end and the other end, so that the end plate body (21) moves in a direction approaching the fixed structure (25).

3. The energy absorbing end plate according to any one of claims 1 to 2, characterized in that: The battery module is fixedly mounted on the battery pack, and the fixing structure (25) is rotatably connected to the battery pack housing of the battery pack via a fastener; and / or, The end plate body (21) has two ends that are arranged opposite to each other, each of the ends is provided with the buffer structure (22) and the fixing structure (25), and the buffer structure (22) and the fixing structure (25) located at one of the ends are arranged in a mirror-symmetrical manner with the buffer structure (22) and the fixing structure (25) located at the other end.

4. The energy absorbing end plate according to claim 1, characterized in that: The battery module also includes a side connecting member, and the buffer structure (22) includes a second section (222). Along a first preset direction of the end plate body (21), the second section (222) protrudes from the end plate body (21) and is connected to the side connecting member, so that the side connecting member is spaced apart from the end of the end plate body (21).

5. The energy absorbing end plate according to claim 4, characterized in that: The side connecting member comprises a side plate (3), the other end of the second section (222) is located between the end of the side plate (3) and the end plate body (21), and the end of the side plate (3) can be connected to the other end of the second section (222) so that the end plate body (21) limits the battery cell (1).

6. The energy absorbing end plate according to claim 1, characterized in that: The energy absorbing end plate (2) further comprises a limiting structure (23), wherein the limiting structure (23) is connected to the buffer structure (22), and the limiting structure (23) can abut against the end plate body (21) to limit the minimum distance between the buffer structure (22) and the end plate body (21).

7. The energy absorbing end plate according to claim 4, characterized in that: The side connecting member comprises a fastening band (4), the other end of the second section (222) is located between the fastening band (4) and the end plate body (21), and the fastening band (4) can abut against the second section (222) and / or the fixing structure (25) to press the end plate body (21) against the battery cell (1).

8. The energy absorbing end plate according to claim 7, characterized in that: A limiting portion is also provided on a side of the second section (222) away from the end plate body (21), and the limiting portion is used to limit the position of the fastening belt (4).

9. The energy absorbing end plate according to claim 4, characterized in that: The second section (222) is arranged parallel to the end plate body (21).

10. A battery module, characterized in that: It comprises a battery core (1) and an energy absorbing end plate (2) as claimed in any one of claims 1 to 9.

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