CN219457837U - Battery cell buffer assembly and battery module comprising same - Google Patents

Abstract

The utility model provides a battery cell buffer assembly and a battery module comprising the same, so as to improve the fracture risk of a side plate of a battery cell frame when the battery cell expands in the existing battery module. This electricity core buffer unit includes: the first plate body, the second plate body and the elastic buffer piece. The plate surface of the second plate body is opposite to the plate surface of the first plate body; the elastic buffer piece is arranged between the first plate body and the second plate body, and two ends of the elastic buffer piece along the stretching direction respectively lean against the first plate body and the second plate body; the first plate body and the second plate body can be mutually clamped under the action of external force. According to the battery cell buffer assembly, after the elastic buffer piece is compressed to the set length, the first plate body and the second plate body can be further clamped, so that the overall width of the first plate body and the second plate body in the compression direction of the elastic buffer piece is reduced, meanwhile, the overall strength of the first plate body and the second plate body after being clamped is improved, and a better protection effect can be achieved on the frame side plate of the battery module.

Description

Battery cell buffer assembly and battery module comprising same

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery core buffer assembly and a battery module comprising the battery core buffer assembly.

Background

With the high-speed development of new energy electric vehicles, the safety performance and the endurance mileage of the electric vehicles become the focus of attention. The all-solid-state battery with the solid electrolyte replacing the organic electrolyte has high safety and long cycle life, and is expected to be the safest substitute of the lithium ion battery in the current market. When the whole solid-state battery is in an off-line (EOL) state, the battery cell is easy to expand and deform, the traditional battery module does not have an expansion buffer structure, the side plate is extruded by the battery cell at the moment, the risk of fracture exists, and if the expansion of the battery cell cannot be released in space, the condition that the service life of the battery cell jumps (namely, the battery electric quantity is reduced in a water jump mode) can occur, so that the using effect is influenced. Therefore, it is desirable to provide a battery cell buffer assembly and a battery module including the same.

Disclosure of Invention

In view of the above drawbacks of the prior art, the present utility model provides a battery cell buffer assembly and a battery module including the same, so as to improve the risk of breakage of a side plate of a battery cell frame when the battery cell expands in the existing battery module.

To achieve the above and other related objects, a first aspect of the present utility model provides a cell buffer assembly, comprising: the first plate body, the second plate body and the elastic buffer piece. The plate surface of the second plate body is opposite to the plate surface of the first plate body; the elastic buffer piece is arranged between the first plate body and the second plate body, and two ends of the elastic buffer piece along the expansion direction respectively lean against the first plate body and the second plate body; the first plate body and the second plate body can be mutually clamped under the action of external force.

In an example of the cell buffer assembly of the present utility model, one of the first plate body and the second plate body is provided with a receiving groove capable of allowing the other to enter.

In an example of the battery cell buffer assembly, parallel first flanges are arranged on two sides, facing the plate surface, of the first plate body, parallel second flanges are arranged on two sides, facing the plate surface, of the first plate body, and the inner side distance between the two first flanges is greater than the outer side distance between the two second flanges so that the two second flanges are clamped between the two first flanges.

In an example of the cell buffer assembly of the present utility model, an elastic buffer mounting seat is disposed on the first plate and/or the second plate.

In one example of the cell buffer assembly of the present utility model, the elastic buffer mount includes a protrusion or a recess that matches the shape of the elastic buffer.

In an example of the cell buffer assembly of the present utility model, the elastic buffer includes a spring, and the elastic buffer mounting seat is a cylindrical protrusion matched with the inner diameter of the spring or a cylindrical groove matched with the outer diameter of the spring.

In an example of the cell buffer assembly of the present utility model, the cell buffer assembly further includes a telescopic link mechanism, where the link mechanism is disposed between the first plate body and the second plate body, and two sides along the telescopic direction are respectively connected with the first plate body and the second plate body in a rotating manner.

In an example of the cell buffer assembly of the present utility model, the link mechanism is a spatial compression link mechanism, and a compression direction of the spatial compression link mechanism is parallel to a compression direction of the elastic buffer member.

In an example of the cell buffer assembly of the present utility model, the cell buffer assembly includes at least two elastic buffer members, and compression directions of the two elastic buffer members are parallel to each other.

A second aspect of the present utility model provides a battery module including: the battery cell buffer assembly comprises a frame, a plurality of battery cells and the battery cell buffer assembly in any example, wherein the battery cells are stacked in the frame in parallel, and the battery cell buffer assembly is arranged between adjacent battery cells and/or between the battery cells and the frame.

The battery cell buffer assembly can be arranged between the battery cells in the battery module or between the battery cells and the side wall of the frame, can bear the extrusion movement of the battery cells when the battery cells are expanded and deformed, can not only enable the battery cells to be expanded and released, but also can provide the pretightening force required by the battery cells, and ensures the reliability and the safety of the structure. And after the elastic buffer piece is compressed to a set length, the clamping can be further realized through the first plate body and the second plate body, so that the integral width of the first plate body and the second plate body in the compression direction of the elastic buffer piece is reduced, and meanwhile, the integral strength of the first plate body and the second plate body after the clamping is improved, the frame side plate of the battery module can be better protected, and the use safety of the battery module is ensured.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a three-dimensional schematic diagram of an embodiment of a cell buffer assembly according to the present utility model;

FIG. 2 is a front view of an embodiment of a cell buffer assembly of the present utility model;

FIG. 3 is a reduced top view of FIG. 2;

FIG. 4 is an exploded view of one embodiment of the cell buffer assembly of the present utility model;

FIG. 5 is a three-dimensional schematic view of a linkage mechanism in an embodiment of a cell buffer assembly according to the present utility model;

FIG. 6 is a side, three-dimensional view of one embodiment of a cell buffer assembly of the present utility model;

fig. 7 is a three-dimensional schematic view of a battery module according to an embodiment of the utility model with a portion of the side plates removed.

Description of element reference numerals

100. A cell buffer assembly; 110. a first plate body; 111. a first flanging; 112. a first accommodating groove; 113. a first cylindrical protrusion; 114. a first mounting shaft; 115. a second mounting shaft; 120. a second plate body; 121. a second flanging; 122. a second cylindrical protrusion; 123. a second mounting shaft; 130. an elastic buffer member; 140. a link mechanism; 141. a first link; 142. a second link; 143. a third link; 144. a fourth link; 145. a fifth link; 146. a sixth link; 147. a first hinge shaft; 148. a second hinge shaft; 149. a third hinge shaft; 1410. a fourth hinge shaft; 200. a frame; 210. lifting lugs; 300. and a battery cell.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. It is also to be understood that the terminology used in the examples of the utility model is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the utility model. The test methods in the following examples, in which specific conditions are not noted, are generally conducted under conventional conditions or under conditions recommended by the respective manufacturers.

Where numerical ranges are provided in the examples, it is understood that unless otherwise stated herein, both endpoints of each numerical range and any number between the two endpoints are significant both in the numerical range. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs and to which this utility model belongs, and any method, apparatus, or material of the prior art similar or equivalent to the methods, apparatus, or materials described in the examples of this utility model may be used to practice the utility model.

It should be understood that the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like are used in this specification for descriptive purposes only and not for purposes of limitation, and that the utility model may be practiced without materially departing from the novel teachings and without departing from the scope of the utility model.

Referring to fig. 1 to 7, the present utility model provides a battery cell buffer assembly 100 and a battery module including the battery cell buffer assembly 100, wherein the battery cell buffer assembly 100 can be disposed between battery cells 300 in the battery module and/or between the battery cells 300 and side walls of a frame 200, so that not only can the extrusion movement of the battery cells 300 be born when the battery cells 300 are expanded and deformed, the expansion of the battery cells 300 can be released, but also the pre-tightening force required by the battery cells 300 can be provided, and meanwhile, further shrinkage can be realized through the first plate 110 and the second plate 120, so that the fracture risk of the side plates of the frame 200 of the battery cells 300 when the battery cells 300 are expanded in the existing battery module can be improved.

Referring to fig. 1 to 3, a first aspect of the present utility model is to provide a cell buffer assembly 100, where the cell buffer assembly 100 includes: the first plate 110, the second plate 120, and the elastic buffer 130. The shape and material of the first plate body 110 and the second plate body 120 in the present utility model may not be excessively limited as long as they have sufficient strength, and may be formed by bending a thin plate, machining, or may be made of a high polymer plastic having relatively high strength. The plate surface of the second plate 120 is opposite to the plate surface of the first plate 110, and the plate surfaces may be parallel, approximately parallel, or not parallel as long as the plate surfaces can be mutually clamped and reduced to the whole width in the compression direction of the elastic buffer 130; preferably, in this embodiment, in order to more uniformly transmit the pressing force, the plate surfaces of the first plate body 110 and the second plate body 120 are parallel to each other. The elastic buffer 130 is disposed between the first plate 110 and the second plate 120, and two ends of the elastic buffer 130 along the extending direction respectively abut against the first plate 110 and the second plate 120, and it should be noted that, as long as the elastic buffer 130 can be ensured to compress and absorb energy when the first plate 110 or the second plate 120 is extruded, the structural form of the elastic buffer 130 may be various, for example, a bent reed, a rubber block, a silica gel block or other polymer elastic block with better energy absorption, and the mounting manner of the elastic buffer 130 may also be various, for example, one side of the elastic buffer 130 is fixed on the first plate 110 by means of bonding, welding or detachable connection, and the other side is fixed on the second plate 120 by means of bonding, welding or detachable connection. Wherein, after the elastic buffer 130 is compressed to a set length, the first plate 110 and the second plate 120 may be clamped with each other under the action of external force, so that the overall width of the first plate 110 and the second plate 120 in the compression direction of the elastic buffer 130 may be reduced by further clamping the first plate 110 and the second plate 120, and at the same time, the overall strength of the first plate 110 and the second plate 120 after clamping is improved, which may play a better protection role on the side plate of the frame 200 of the battery module, and ensure the use safety of the battery module.

Referring to fig. 1, in the present utility model, one of the first plate 110 and the second plate 120 is provided with a receiving groove capable of allowing the other to enter. In this embodiment, the first plate 110 has a larger size, the first plate 110 is provided with a first accommodating groove 112 capable of allowing the second plate 120 to enter, and after the elastic buffer member 130 is compressed to a set length, the second plate 120 enters into the first accommodating groove 112, so that the overall thickness of the first plate 110 and the second plate 120 is further reduced in the compression direction, and the overall strength of the first plate 110 and the second plate 120 is also improved. However, in another embodiment, the second plate 120 has a larger size, the second plate 120 is provided with a receiving groove capable of allowing the first plate 110 to enter, when the elastic buffer 130 is compressed to a set length, the first plate 110 enters into the receiving groove on the second plate 120, so that the overall thickness of the first plate 110 and the second plate 120 can be further reduced in the compression direction, and the effect of improving the overall strength of the first plate 110 and the second plate 120 can be achieved.

In the present embodiment, parallel first flanges 111 are disposed on two sides of the first plate 110 facing the second plate 120, the end surface of the first plate 110 is concave, so that the first accommodating groove 112 is formed between the two first flanges 111, parallel second flanges 121 are disposed on two sides of the second plate 120 facing the first plate 110, the two first flanges 111 are parallel to the extending direction of the two second flanges 121, and the inner distance D1 of the two first flanges 111 is greater than the outer distance D2 of the two second flanges 121, so that the two second flanges 121 on the second plate 120 are clamped into the first accommodating groove 112 between the two first flanges 111 of the first plate 110. It will be appreciated by those skilled in the art that a receiving groove may be formed between the two second flanges 121, and the outer dimensions of the two first flanges 111 may be smaller than or equal to the inner spacing between the two second flanges 121, so that the two first flanges 111 may be clamped into the receiving groove between the two second flanges 121.

In order to achieve reliable installation of the elastic buffer 130, in an embodiment of the cell buffer assembly 100 of the present utility model, an elastic buffer mounting seat is disposed on the first plate 110 and/or the second plate 120. In this embodiment, the first plate 110 and the second plate 120 are provided with elastic buffer mounting seats, but of course, only the first plate 110 or the second plate 120 may be provided with elastic buffer mounting seats, but the stability effect of the elastic buffer mounting seats is worse than that of the first plate 110 and the second plate 120 in this embodiment, although the elastic buffer mounting seats are not provided on both sides. The structural form of the elastic buffer mount is not limited as long as stable mounting of the elastic buffer 130 can be achieved, and the elastic buffer mount may include a protrusion or a groove matching the shape of the elastic buffer 130. For example, in one embodiment, the elastic buffer 130 is an elastic rubber block or a silica gel block, and the elastic buffer mounting seat is a groove matching with the external shape of the rubber block or the silica gel block, so that the rubber block or the silica gel block is inserted into the groove to mount the elastic buffer 130. Of course, a concave portion may be provided on the rubber block or the silicone block, so that the elastic buffer member mounting seat is a protrusion with a shape matching the concave portion, and the protrusion is inserted into the concave portion to mount the elastic buffer member 130.

Although the elastic buffer 130 may also be in the form of rubber block, silica gel block or bent reed, as shown in fig. 1 and 2, in this embodiment, the elastic buffer 130 includes a spring, the mounting seat of the elastic buffer is a cylindrical protrusion matching with the inner diameter of the spring, the first plate 110 is provided with a first cylindrical protrusion 113, the second plate 120 is provided with a second cylindrical protrusion 122, the first cylindrical protrusion 113 and the second cylindrical protrusion 122 are respectively matched with the inner diameters of two ends of the spring, the first cylindrical protrusion 113 is inserted into one end of the spring, the second cylindrical protrusion 122 is inserted into the other end of the spring, the fit between the spring and the first cylindrical protrusion 113 and the second cylindrical protrusion 122 may be selected according to the requirement, the elastic buffer may be an interference fit if the higher fixity is required, and the clearance fit may be adopted if the better disassembly convenience is required. Of course, those skilled in the art will appreciate that in other embodiments, one or both of the first and second cylindrical protrusions 113, 122 may be replaced with a cylindrical recess that matches the outer diameter of the spring.

In an example of the cell buffer assembly 100 of the present utility model, the cell buffer assembly 100 further includes a telescopic link mechanism 140, where the link mechanism 140 is disposed between the first plate 110 and the second plate 120, and two sides along the telescopic direction are respectively connected with the first plate 110 and the second plate 120 in a rotating manner. The telescopic link mechanism 140 may be, for example, a scissor folding type parallel four-link telescopic joint on the lifting platform, or other existing link mechanisms 140 capable of achieving folding and contraction.

Preferably, referring to fig. 4 to 6, in the present embodiment, the link mechanism 140 is a space compression link mechanism, and a compression direction of the space compression link mechanism is parallel to a compression direction of the elastic buffer. The space compression link mechanism includes a first link 141, a second link 142, a third link 143, a fourth link 144, a fifth link 145, a sixth link 146, a first hinge shaft 147, a second hinge shaft 148, a third hinge shaft 149, and a fourth hinge shaft 1410; a first mounting shaft 114 is disposed on one side of the first plate body 110, a first mounting shaft 115 is disposed on the other side of the first plate body 110, the first mounting shaft 114 is parallel to the first mounting shaft 115, and the axis is perpendicular to the two first flanges 111. The axes of the first, second, third and fourth hinge shafts 147, 148, 149, 1410 are parallel to the first mounting shaft 114. One end of the first link 141 is hinged to the first mounting shaft 114, and the other end of the first link 141 is hinged to the middle of the first hinge shaft 147. One end of the second link 142 is hinged to the third mounting shaft 123, and the other end of the second link 142 is hinged to the lower end of the first hinge shaft 147. One end of the third link 143 is hinged to the second mounting shaft 115, and the other end of the third link 143 is hinged to an upper end of the second hinge shaft 148. One end of the fourth link 144 is hinged to the fourth mounting shaft (not shown), and the other end of the fourth link 144 is hinged to the middle of the second hinge shaft 148. One end of the fifth link 145 is hinged to the upper end of the first hinge shaft 147, and the other end of the fifth link 145 is hinged to the lower end of the third hinge shaft 149; the upper end of the third hinge shaft 149 is hinged to the fourth link 144. One end of the sixth link 146 is hinged to the upper end of the fourth hinge shaft 1410, and the other end of the sixth link 146 is hinged to the lower end of the second hinge shaft 148; the lower end of the fourth hinge shaft 1410 is hinged to the second link 142. In the above-mentioned hinge installation relationships, the hinge rotation centers are all coincident with the center lines of the corresponding hinge shafts, and will not be described in detail.

In the present utility model, the number of the elastic buffer members 130 may be one, two or more, for example, in one embodiment, the elastic buffer members 130 are one and have a sufficient bearing area compared to the first plate 110 and the second plate 120 to be uniformly compressed under the compression of the first plate 110 and the second plate 120. Preferably, referring to fig. 3, in the present embodiment, the number of the elastic buffer members 130 is two, the two elastic buffer members 130 are springs, and the two springs are symmetrically disposed at two sides of the link mechanism 140, respectively, and have a space enough to avoid the link mechanism 140, so as to avoid interference with the compressed link mechanism 140. It should be noted that in other embodiments, the number of springs may be greater, but the compression directions of all the springs should be parallel to each other.

Referring to fig. 7, the present utility model further provides a battery module. The battery module according to the embodiment of the present utility model includes a frame 200, a plurality of battery cells 300, and the battery cell buffer assembly 100 described in any one of the above examples, the frame 200 including a bottom plate, an upper cover, a left side plate, a right side plate, a front end plate, and a rear end plate, the above components being constructed in a rectangular box shape. A plurality of battery cells 300 are provided in the frame 200, and the battery cells 300 are substantially rectangular packages stacked and arranged in the frame 200 such that long and narrow side surfaces parallel to the longitudinal direction and the thickness direction contact the bottom plate and the longitudinal direction is the same as the extending direction of the left and right side plates. Lifting lugs 210 are further arranged on the outer side surfaces of the left side plate and the right side plate and are used for lifting the whole battery module. In the battery module of the present utility model, some components, such as the front end plate, the rear end plate, and the busbar components, are removed or shielded for display. The cell buffer assemblies 100 are disposed between adjacent cells 300 and/or between the cells 300 and the frame 200. In this embodiment, the battery core buffer assembly 100 is disposed between the battery core 300 and the side plate of the frame 200, under the condition that the battery core 300 does not expand, the battery core buffer assembly 100 can pre-compress the battery core 300 through the elastic buffer member 130, when the battery core 300 expands, the expanded extrusion force pushes the second plate 120 far away from the side plate of the frame 200 to approach the first plate 110 so as to further compress the elastic buffer member 130, after the battery core 300 is compressed to a set length, the expansion extrusion force of the battery core 300 is larger, the first plate 110 and the second plate 120 are clamped under the extrusion force, so that not only can the requirement of deformation of the battery core 300 be met, but also the clamped first plate 110 and second plate 120 have better strength so as to better protect the side wall of the frame 200. However, in another embodiment of the present utility model, the cell buffer assembly 100 of the present utility model may be disposed between adjacent cells 300 to provide a deformation space for expanding the cells 300 at both sides. In still another embodiment of the present utility model, there are a plurality of the cell buffer assemblies 100, and the plurality of the cell buffer assemblies 100 are respectively disposed between the adjacent cells 300 and between the cells 300 and the frame 200. Not only can absorb deformation energy among the battery cells 300, but also can absorb the extrusion force of the battery cells 300 to the side plates of the frame 200, thereby playing a role in double protection. It should be noted that the battery module of the present utility model may also include a limiting member of the battery cell 300 or other conventional structures of some battery modules, which may refer to the prior art and are not described herein again.

The battery cell buffer assembly 100 can be arranged between the battery cells 300 in the battery module or between the battery cells 300 and the side wall of the frame 200, can bear the extrusion movement of the battery cells 300 when the battery cells 300 are expanded and deformed, can provide required pretightening force for the battery cell stacking body in an EOL state, and can uniformly move after the battery cells 300 are expanded, so that the expansion and deformation of the battery cells 300 are released, the risk of water jump during the service life of the battery cells is avoided, and the reliability and the safety of the structure are ensured. And when the elastic buffer 130 is extruded to a set length, the first plate 110 and the second plate 120 can be further clamped, so that the overall width of the first plate 110 and the second plate 120 in the compression direction of the elastic buffer 130 is reduced, in addition, after the first plate 110 and the second plate 120 are clamped, the clamping force on the battery cell 300 is the sum of the force of the elastic buffer and the mutual supporting force of the two plates, and thus the clamping force on the battery cell is larger and larger in the later stage of compression, not only enough space can be provided for the deformation of the battery cell, but also the opposite plates can be better protected with higher strength, and the use safety of the battery module is ensured. Therefore, the utility model effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance. The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (10)

1. A cell buffer assembly, comprising:

a first plate body;

the plate surface of the second plate body is opposite to the plate surface of the first plate body;

the elastic buffer piece is arranged between the first plate body and the second plate body, and two ends of the elastic buffer piece along the expansion direction respectively lean against the first plate body and the second plate body;

the first plate body and the second plate body can be mutually clamped under the action of external force.

2. The cell buffer assembly of claim 1, wherein one of the first plate and the second plate is provided with a receiving groove capable of allowing the other to enter.

3. The battery cell buffering assembly according to claim 1, wherein parallel first flanging edges are arranged on two sides of the first plate body, which face the second plate body, parallel second flanging edges are arranged on two sides of the second plate body, which face the first plate body, and the inner side distance between the two first flanging edges is larger than the outer side distance between the two second flanging edges so that the two second flanging edges are clamped between the two first flanging edges.

4. The cell buffer assembly of claim 1, wherein the first plate and/or the second plate are provided with an elastic buffer mount.

5. The cell buffer assembly of claim 4, wherein the spring buffer mount comprises a protrusion or recess that matches the shape of the spring buffer.

6. The cell buffer assembly of claim 5, wherein the elastic buffer comprises a spring, the elastic buffer mount being a cylindrical protrusion matching the inner diameter of the spring or a cylindrical recess matching the outer diameter of the spring.

7. The cell buffer assembly of claim 1, further comprising a telescopic link mechanism disposed between the first plate and the second plate and rotatably connected to the first plate and the second plate along two sides of the telescopic direction, respectively.

8. The cell buffer assembly of claim 7 wherein the linkage is a spatial compression linkage having a compression direction parallel to a compression direction of the elastic buffer.

9. The cell buffer assembly of claim 1, wherein the cell buffer assembly comprises at least two elastic buffers, the compression directions of the two elastic buffers being parallel to each other.

10. A battery module, comprising: the battery module is characterized by further comprising the battery cell buffer assembly according to any one of claims 1 to 9, wherein the battery cell buffer assembly is arranged between adjacent battery cells and/or between the battery cells and the frame.