Elastic body and battery module

Abstract

The utility model discloses an elastic body and a battery module, the elastic body is used for being arranged among battery cells of a battery cell stack body, the vertical distance from the stress part of a first elastic piece to a bottom plate is larger than the vertical distance from the stress part of a second elastic piece to the bottom plate, and because the vertical distances from the stress parts of the elastic pieces to the bottom plate are inconsistent, the elastic pieces are not easy to deform. When the elastic body is arranged between two adjacent battery cells in the battery cell stack, the first elastic piece with a larger vertical distance is stressed and compressed, that is, only part of the elastic piece is stressed, the resistance borne by the elastic piece inserted between the battery cells is small, convenience and rapidness are achieved, and the installation procedure of the elastic body is simplified; after arrangement is completed, the elastic body shrinks when the battery cell expands, and the first elastic piece and the second elastic piece provide reverse resistance elastic force while being stressed; when the battery cell shrinks, the elastic body expands, and only the first elastic piece is stressed and provides reverse resisting elastic force, so that the battery cell can keep good pre-tightening force no matter the battery cell expands or shrinks, and the safety of the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an elastic body and a battery module. Background Art

[0002] Whether in the energy storage industry or the new energy industry, the thermal safety of lithium battery packs is a technical problem that needs to be solved urgently. Commonly used technologies include liquid cold plate cooling technology and immersion cooling. Liquid cold plate cooling is indirect heat exchange, with a long heat transfer path and low heat exchange efficiency; immersion cooling is to immerse the battery in a box containing coolant, directly exchange heat, and have high cooling efficiency. However, most coolants contain organic solvents, and foam is conventionally set between two battery cells to provide space for the battery cell to expand. Foam is generally an organic material. Due to the similar and compatible characteristics of the materials, corrosion and other phenomena may occur in the foam between the battery cells during immersion cooling.

[0003] Although a new type of elastomer currently available solves the problem that foam between cells may corrode during immersion cooling, for example, a spring plate used in a battery plate group with publication number CN109148817A has multiple holes on the plane of the spring plate, and a spring or spring sheet that can automatically adjust the height according to the pressure is provided on the spring plate, and the spring or spring sheet is arranged on one side of the spring plate to form a spring plate with evenly distributed multiple holes and evenly distributed multiple springs or multiple spring sheets. Although the spring plate replaces the foam, all springs or spring sheets on the spring plate have the same height, and when inserted between the cells, all springs or spring sheets are compressed at the same time, which makes assembly difficult, and the preload force received by the cell is large, which reduces the life cycle of the cell. Utility Model Content

[0004] The main purpose of the utility model is to provide an elastomer and a battery module, aiming to solve the technical problems of difficulty in assembling the elastomer when plugging between battery cells and short life cycle of the battery cells.

[0005] In order to achieve the above-mentioned utility model object, the utility model provides an elastic body for being arranged between the battery cells of the battery cell stack, comprising a bottom plate and an elastic member, wherein the elastic member is arranged on one side or both sides of the bottom plate, and one end of the elastic member is connected to the bottom plate, and the other end is provided with a force-bearing portion for bearing the extrusion force of the battery cell;

[0006] The elastic member includes a plurality of first elastic members and a plurality of second elastic members, wherein a vertical distance from a force-bearing portion of the first elastic member to the bottom plate is greater than a vertical distance from a force-bearing portion of the second elastic member to the bottom plate.

[0007] Furthermore, the elastic member is a spring sheet.

[0008] Furthermore, the first elastic member and the second elastic member are inclined spring pieces formed by punching the bottom plate.

[0009] Furthermore, the angles formed by the plurality of first elastic members and the bottom plate are consistent; the angles formed by the plurality of second elastic members and the bottom plate are consistent.

[0010] Furthermore, the length of the connection between the first elastic member and the bottom plate is smaller than the length of the connection between the second elastic member and the bottom plate.

[0011] Furthermore, the bottom plate is punched to form punched holes corresponding to the inclined spring sheets.

[0012] Furthermore, the elastic members are evenly distributed on the bottom plate.

[0013] Further, one adjacent first elastic member and one adjacent second elastic member form a group, and the first elastic member and the second elastic member in the same group have opposite inclination directions.

[0014] Furthermore, the free end of the elastic member is bent to form a force-bearing portion opening toward the bottom plate.

[0015] Furthermore, it also includes an outer frame plate, the outer frame plate includes at least a first plate, and the elastic member is arranged toward the first plate; wherein a gap exists between the first plate and the second elastic member.

[0016] Furthermore, the outer frame plate also includes a second plate arranged parallel to the first plate; the edges of the first plate and the second plate are connected by a connecting structure; the bottom plate and the elastic member are clamped between the first plate and the second plate, and the second plate is fitted and fixed to the bottom plate.

[0017] Furthermore, the first plate and / or the second plate are provided with process holes, and the first plate and / or the second plate are connected and fixed to the bottom plate through the process holes.

[0018] Furthermore, the connection structure is any one of a V-shaped plate, a U-shaped plate and an S-shaped plate.

[0019] Furthermore, the first plate, the second plate and the connecting structure are integrally formed.

[0020] Further, both ends of the bottom plate are provided with a first section, the first section is inclined toward the first plate, and one end of the first section away from the bottom plate extends to have a second section parallel to the bottom plate;

[0021] The first plate is provided with a hook structure corresponding to the second section, the free end of the second section is hooked in the hook structure, and a movable space for the second section to move is provided in the hook structure.

[0022] Furthermore, it also includes an outer frame plate, which includes a first plate, a second plate and a connecting structure, the first plate and the second plate are arranged in parallel and connected by the connecting structure; the elastic member is provided on both sides of the bottom plate, the bottom plate and the elastic member are clamped between the first plate and the second plate, and at least one end of the bottom plate is connected to the connecting structure.

[0023] On the other hand, the utility model provides a battery module, including an elastomer as described in any of the above embodiments, and also including a plurality of battery cells, wherein an elastomer is inserted between every two of the battery cells, wherein the sum of the vertical distance from the force-bearing part of the second elastic member to the bottom plate and the thickness of the bottom plate is less than the spacing between the battery cells.

[0024] Beneficial effects:

[0025] In the elastomer of the utility model, the vertical distance between the force-bearing part of the first elastic member and the bottom plate is greater than the vertical distance between the force-bearing part of the second elastic member and the bottom plate. Since the vertical distances between the force-bearing parts of the elastic members and the bottom plate are inconsistent, when arranged between two adjacent battery cells in a battery cell stack, the first elastic member with a larger vertical distance is compressed by force, that is, only part of the elastic member is stressed, and the resistance encountered when plugged between the battery cells is small, which is convenient and quick, and simplifies the installation process of the elastomer; after the arrangement is completed, the elastomer contracts when the battery cell expands, and the first elastic member and the second elastic member both provide reverse resistance elastic force while being stressed; when the battery cell contracts, the elastomer expands, and only the first elastic member is stressed and provides reverse resistance elastic force, so that the battery cell can maintain a good preload force regardless of expansion or contraction, thereby improving the safety of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of the elastic body in one embodiment of the utility model;

[0027] Figure 2 for Figure 1 A local enlarged schematic diagram of the middle A;

[0028] Figure 3 This is a schematic diagram of the side structure of the elastic body in one embodiment of the utility model;

[0029] Figure 4 for Figure 3 A partial enlarged schematic diagram of point B in the middle;

[0030] Figure 5 This is a schematic diagram of the overall structure of an outer frame plate in one embodiment of the utility model;

[0031] Figure 6 It is a side view structural schematic diagram of an embodiment of the utility model after an elastic member is placed in an outer frame plate;

[0032] Figure 7 for Figure 6 A partial enlarged schematic diagram of point C in the middle;

[0033] Figure 8 It is a partial side view schematic diagram of an embodiment of the utility model in which the elastic members are arranged on both sides of the bottom plate;

[0034] Fig. 9 It is a side view structural diagram of an embodiment of the utility model after the elastic member is placed in another outer frame plate;

[0035] Fig.10 for Fig. 9 A partial enlarged schematic diagram of point D in the middle;

[0036] Fig.11 for Fig. 9 Schematic diagram of the overall structure;

[0037] Fig.12 It is a schematic diagram of a state in which an elastic body is applied between battery cells and the elastic body is contracted in one embodiment of the utility model.

[0038] in:

[0039] 1. Elastomer;

[0040] 11. bottom plate; 110. punching hole; 111. first section; 112. second section;

[0041] 12. elastic member; 121. first elastic member; 122. second elastic member; 123. connection point; 124. force-bearing part;

[0042] 2. Battery cells;

[0043] 3. Outer frame plate;

[0044] 31. first plate; 311. hook structure; 312. movable space;

[0045] 32. second plate; 321. process hole;

[0046] 33. Connection structure.

[0047] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0048] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0049] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0050] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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, 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 utility model can be understood according to specific circumstances.

[0051] 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.

[0052] Reference Figure 1-11 , an embodiment of the utility model provides an elastic body 1, which is used to be arranged between the battery cells 2 of the battery cell stack, and includes a bottom plate 11 and an elastic member 12, wherein the elastic member 12 is arranged on one side or both sides of the bottom plate 11, and one end of the elastic member 12 is connected to the bottom plate 11, and the other end is provided with a force-bearing portion 124 for bearing the extrusion force of the battery cell;

[0053] The elastic member 12 includes a plurality of first elastic members 121 and a plurality of second elastic members 122 , wherein a vertical distance from a force-bearing portion 124 of the first elastic member 121 to the bottom plate 11 is greater than a vertical distance from a force-bearing portion 124 of the second elastic member 122 to the bottom plate 11 .

[0054] In the above embodiment, the vertical distance between the force-bearing portion 124 of the first elastic member 121 and the bottom plate 11 is greater than the vertical distance between the force-bearing portion 124 of the second elastic member 122 and the bottom plate 11. Since the vertical distances between the force-bearing portion 124 of the elastic member 12 and the bottom plate 11 are inconsistent, when arranged between two adjacent battery cells 2 in the battery cell stack, the first elastic member 121 having a larger vertical distance between the force-bearing portion 124 and the bottom plate 11 first contacts the battery cell 2, while there is still a gap between the force-bearing portion 124 of the second elastic member 122 and the battery cell 2. Therefore, only the first elastic member 121 is in contact with the battery cell 2. The elastic member 121 is compressed, that is, only part of the elastic member 12 is stressed. The resistance encountered by the first elastic member 121 when inserted between the battery cells 2 is less than the resistance encountered by all the elastic members 12 in the prior art when simultaneously inserted between the battery cells 2. It is easier to compress, has low assembly difficulty, is convenient and quick, and simplifies the installation process of the elastomer 1. After the arrangement is completed, the elastic member 12 is clamped between the two battery cells 2, and the first elastic member 121 is subjected to the squeezing force from the battery cells 2 on both sides. There is a gap between the second elastic member 122 and one side of the battery cell 2, and it is not subjected to the squeezing force from the battery cells 2 on both sides.

[0055] During operation, the battery cells 2 expand and the distance between the battery cells 2 decreases. The distance between the battery cells 2 is not only smaller than the original vertical distance between the force-bearing portion 124 of the first elastic member 121 and the bottom plate 11, but also smaller than the original vertical distance between the force-bearing portion 124 of the second elastic member 122 and the bottom plate 11. The elastomer 1 contracts, the force-bearing portion 124 of the first elastic member 121 approaches the bottom plate 11, the gap between the second elastic member 122 and the battery cells 2 decreases and the force-bearing portion 124 begins to be stressed. The force-bearing portion 124 of the first elastic member 121 and the force-bearing portion 124 of the second elastic member 122 work simultaneously, and both provide uniformly increasing reverse elastic force while being stressed to resist the expansion force of the battery cells 2, so that the battery cells 2 are in a force-balanced state, thereby ensuring the safety of the battery cells 2. When the battery cells 2 shrink, the distance between the battery cells 2 increases, and the elastomer 1 expands. The distance between the battery cells 2 is greater than the vertical distance between the force-bearing portion 124 of the second elastic member 122 and the bottom plate 11, and is less than the vertical distance between the force-bearing portion 124 of the first elastic member 121 and the bottom plate 11. Only the first elastic member 121 bears the force and provides the elastic force to resist the battery cells 2 in the opposite direction, so that the battery cells 2 can maintain a good preload force regardless of expansion or contraction, thereby improving the safety of the battery cells 2 and extending the life cycle of the battery cells.

[0056] In the above embodiment, multiple first elastic members 121 and multiple second elastic members 122 are all arranged on one side or both sides of the bottom plate 11, and one end is connected to the bottom plate 11, and the end with the farthest vertical distance from the bottom plate 11 is the force-bearing part 124, and the vertical distance of the force-bearing part 124 of the first elastic member 121 to the bottom plate 11 is greater than the vertical distance of the force-bearing part 124 of the second elastic member 122 to the bottom plate 11, so the vertical distance of the force-bearing part 124 of the first elastic member 121 to the bottom plate 11 plus the thickness of the bottom plate 11 is the thickness of the entire elastic member 12, and the vertical distance of the force-bearing part 124 of the first elastic member 121 to the bottom plate 11 decreases, the thickness of the elastic member 12 decreases, and the elastic member 12 contracts; the vertical distance of the force-bearing part 124 of the first elastic member 121 to the bottom plate 11 increases, the thickness of the elastic member 12 increases, and the elastic member 12 expands. There is a gap between every two elastic members 12, so there are a large number of gaps inside the elastomer 1. Different from the structure inside the foam, the battery pack can use an insulating cooling medium to directly immerse and contact the battery cell 2 to take away heat. The cooling medium can easily flow into the elastomer 1 through the gaps between the elastic members 12, thereby contacting all surfaces of the battery cell 2, greatly improving the cooling rate.

[0057] In the above embodiment, the elastomer 1 is preferably made of a highly elastic metal material. The metal material has high thermal conductivity and high temperature resistance, and can replace traditional foam. It is also not easy to melt, and the aerogel will not be crushed and fall into slag, thereby preventing the thermal runaway of the battery cell 2 from spreading. The elastomer 1 is preferably arranged between the large surfaces of the two battery cells 2, and the elastomer 1 is in contact with the large surface of the battery cell 2, so the contact area is increased and the heat exchange efficiency is higher.

[0058] In the above embodiment, the elastic member 12 is a spring. The spring is flat or thin, with a small thickness, and can provide the required elasticity in the limited space between the battery cells 2. In another embodiment, the elastic member 12 can also be a spring, which has a large deformation ability and restoring force, and can provide a more stable and lasting support force.

[0059] In the above embodiment, the first elastic member 121 and the second elastic member 122 are inclined spring pieces formed by punching the bottom plate 11. The bottom plate 11 is integrally stamped to form a spring piece inclined relative to the bottom plate 11. One end of the spring piece is connected to the bottom plate 11, and the other end is away from the bottom plate 11. A punching hole 110 corresponding to the spring piece is formed on the bottom plate 11. The punching production process is simple and mature, with low cost, and reduces the weight of the elastomer; and the punching hole 110 runs through the large surface of the bottom plate. When the cooling method of immersing the battery cell 2 in the cooling medium is adopted, the punching hole 110 corresponding to the inclined spring piece can provide more cooling channels, further improving the cooling efficiency. The spring piece can also be connected to the bottom plate 11 by welding or other methods, which will not be described in detail here.

[0060] In the above embodiment, the angles formed by the plurality of first elastic members 121 and the bottom plate 11 are consistent, and the angles formed by the plurality of second elastic members 122 and the bottom plate 11 are consistent. The first elastic members 121 and the second elastic members 122 on the same side are both springs, and the inclination angles of all the first elastic members 121 and the second elastic members 122 are consistent, which can ensure that the supporting force and pressure provided by all the first elastic members 121 are uniform, and the supporting force and pressure provided by all the second elastic members 122 are also uniform, which is beneficial to improving the reliability of the battery cell 2 and reducing the potential risk of damage. Preferably, the inclination angles of the first elastic member 121 and the second elastic member 122 are consistent, which is convenient for using the same mold and convenient for production.

[0061] In the above embodiment, the length of the connection 123 between the first elastic member 121 and the bottom plate 11 is less than the length of the connection 123 between the second elastic member 122 and the bottom plate 11. One end of the elastic member 12 is connected to the bottom plate 11. When the inclination angles of all the first elastic members 121 and the inclination angles of all the second elastic members 122 are kept consistent, the second elastic member 122 with a longer connection has a relatively stronger connection with the bottom plate 11, and the first elastic member 121 has a relatively weaker connection with the bottom plate 11. The supporting force of the first elastic member 121 on the bottom plate 11 is also relatively weaker. The first elastic member 121 can be compressed more easily, further improving the efficiency of plugging. In another embodiment, the length of the connection 123 between the first elastic member 121 and the bottom plate 11 is equal to the length of the connection 123 between the second elastic member 122 and the bottom plate 11. The molds used for punching the first elastic member 121 and the second elastic member 122 are the same and do not need to be replaced, thereby improving production efficiency.

[0062] In one embodiment, the elastic member 12 is evenly distributed on the bottom plate 11. The elastic member 12 is evenly distributed on one side of the bottom plate 11, specifically, it can be distributed in a linear array, a diamond shape, etc., so as to evenly apply force to the battery cell 2, thereby providing a more stable preload force; preferably, the first elastic member 121 and the second elastic member 122 are distributed at intervals on one side of the bottom plate 11, and the number of the first elastic member 121 and the second elastic member 122 in the same row or the same column is roughly the same, so that the first elastic member 121 is evenly stressed when the battery cell 2 is plugged in, and the elastic member 12 can also transmit a more balanced force when the battery cell 2 is working; of course, the first elastic member 121 and the second elastic member 122 can also be unevenly spaced and irregularly arranged.

[0063] like Figure 3-4As shown, in the above embodiment, one adjacent first elastic member 121 and one adjacent second elastic member 122 form a group, and the first elastic member 121 and the second elastic member 122 in the same group are inclined in opposite directions. The first elastic member 121 and the adjacent second elastic member 122 form a group, and the two are inclined in opposite directions, which can provide a more uniform force distribution and avoid applying too much pressure point on the battery cell 2; by grouping adjacent elastic members 12 with opposite inclination directions into a group, the strength and stability of the elastic body 1 structure can also be increased.

[0064] Reference Figure 4 In one embodiment, the free end of the elastic member 12 is bent to form a force-bearing portion 124 that opens toward the bottom plate 11. The free end of the elastic member 12 is bent to form the force-bearing portion 124, and the force-bearing portion 124 opens toward the bottom plate 11. The arc surface of the force-bearing portion 124 away from the bottom plate 11 is in direct contact with the battery cell 2. When the elastic member 12 is reciprocally compressed or expanded, the arc surface is easy to slide when in contact with the battery cell 2, which can reduce the friction between the elastic member 12 and the battery cell 2, reduce the wear of the elastic member 12 and the battery cell 2, and improve the safety of the battery cell 2 and the reliability of the elastic member 12; when the elastic body 1 also includes an outer frame plate 3, the arc surface of the force-bearing portion 124 away from the bottom plate 11 is in direct contact with the outer frame plate 3, which also plays a role in reducing the friction between the elastic member 12 and the outer frame plate 3. The specific implementation of the outer frame plate 3 refers to the following embodiments.

[0065] In one embodiment, the elastic body 1 further includes an outer frame plate 3, the outer frame plate 3 includes at least a first plate 31, and the elastic member 12 is disposed toward the first plate 31; wherein a gap exists between the first plate 31 and the second elastic member 122. One side of the bottom plate 11 where the elastic member 12 is disposed faces the first plate 31, thereby avoiding direct contact between the elastic member 12 and the battery cell 2, and reducing wear of the elastic member 12 and the battery cell 2.

[0066] In the above embodiment, the outer frame plate 3 also includes a second plate 32 arranged in parallel with the first plate 31; the edges of the first plate 31 and the second plate 32 are connected by a connecting structure 33; the bottom plate 11 and the elastic member 12 are sandwiched between the first plate 31 and the second plate 32, and the second plate 32 is fitted and fixed to the bottom plate 11. The edges of the first plate 31 and the second plate 32 are connected by the connecting structure 33, which enhances the stability of the outer frame plate 3. The outer frame plate 11 can be provided with a connecting structure 33 on one side, or on both sides of the outer frame plate 11. In order to save processing costs, it is preferred that only one side is provided with a connecting structure 33; and the bottom plate 11 and the elastic member 12 are sandwiched between the first plate 31 and the second plate 32, which effectively protects the elastic member 12; the second plate 32 is fitted and fixed to the bottom plate 11, which further fixes the bottom plate 11 and the elastic member 12 to prevent displacement or loosening during use.

[0067] In the above embodiment, the first plate 31 and / or the second plate 32 are provided with process holes 321, and the first plate 31 and / or the second plate 32 are connected and fixed to the bottom plate 11 through the process holes 321. The second plate 32 that is in contact with the bottom plate 11 is provided with uniform process holes 321, so that the outer frame plate 3 and the bottom plate 11 can be welded conveniently by inserting a welding gun into the process holes 321 on the second plate 32. Of course, the outer frame plate 3 and the bottom plate 11 can also be welded through the process holes on the first plate 31.

[0068] Reference Figure 6-8 In the above embodiment, the connection structure 33 is any one of a V-shaped plate, a U-shaped plate and an S-shaped plate. Viewed from the side, the connection structure 33 can be a V-shaped plate that provides a certain support, and can be a deformation close to a V-shape or other shapes, such as a U-shaped plate or an S-shaped plate formed by an arc transition at the V-shaped turning point. When the elastic body 1 is compressed, the first plate 31 and the second plate 32 are close, and the V-shaped plate, the U-shaped plate or the S-shaped plate is compressed accordingly. When the elastic body 1 expands, the first plate 31 is away from the second plate 32. The V-shaped plate, the U-shaped plate or the S-shaped plate can provide a certain support and further enhance the stability of the outer frame plate 3; the opening of the V-shaped plate faces the elastic member 12 to avoid the first elastic member 121 and the second elastic member 122, and does not affect the uniformity of the arrangement of the elastic member 12; the opening of the V-shaped plate can also face the side away from the elastic member 12, but it is necessary to ensure that the elastic member 12 will not be affected during compression. When compressed, the opening of the V-shaped plate faces the inside, and the volume of the elastic body 1 is further reduced, thereby saving space.

[0069] In one embodiment, the first plate 31, the second plate 32 and the connecting structure 33 are integrally formed. The integrally formed outer frame plate 3 has no looseness or gap, and the production process is simple and mature; preferably, the outer frame plate 3 is a straight plate that is bent and formed, which can simplify the manufacturing process, reduce assembly links, and reduce production costs.

[0070] Reference Figure 9-11In one embodiment, a first section 111 is provided at both ends of the bottom plate 11, the first section 111 is inclined toward the first plate 31, and a second section 112 parallel to the bottom plate 11 is extended from one end of the first section 111 away from the bottom plate 11; the first plate 31 is provided with a hook structure 311 corresponding to the second section 112, the free end of the second section 112 is hooked in the hook structure 311, and a movable space 312 for the second section 112 to move is provided in the hook structure 311. This embodiment provides another form of outer frame plate 3, wherein the first section 111 is provided at each end of the bottom plate 11, and the first section 111 is first inclined and then extended toward the first plate 31, so that the first section 111 gradually approaches the first plate 31, and the second section 112 is parallel to the first plate 31 and the bottom plate 11, and the second section 112 extends into the hook structure 311, so that the second section 112 is close to the hook structure 311 in the longitudinal direction, and does not contact the hook structure 311 in the transverse direction, and there is a movable space 312 as a margin for the second section 112 to move during compression. When in use, the battery cell 2 expands, the bottom plate 11 approaches the first plate 31, the inclination angle of the first section 111 at both ends of the bottom plate 11 decreases, the length of the first section 111 in the direction parallel to the bottom plate 11 increases, and the second section 112 slides toward the hook structure 311 and in the movable space 312; when the battery cell 2 contracts, the elastic member returns to its original state.

[0071] Reference Figure 8 In another embodiment, the elastic body 1 further includes an outer frame plate 3, the outer frame plate 3 includes a first plate 31, a second plate 32 and a connecting structure 33, the first plate 31 and the second plate 32 are arranged in parallel and connected by the connecting structure 33; the elastic member 12 is arranged on both sides of the bottom plate 11, the bottom plate 11 and the elastic member 12 are sandwiched between the first plate 31 and the second plate 32, and at least one end of the bottom plate 11 is connected to the connecting structure 33. The first plate 31 and the second plate 32 are arranged in parallel and connected by the connecting structure 33, so that the entire outer frame plate 3 is more solid, and can better protect the bottom plate 11 and the elastic member 12, and improve the stability of the overall structure; the elastic member 12 can be arranged on both sides of the bottom plate 11, and when the elastic member 12 on one side fails, the elastic member 12 on the other side can still work, thereby enhancing the reliability of the elastic body 1. Preferably, when an adjacent first elastic member 121 and a second elastic member 122 form a group, each group of elastic members 12 on both sides of the bottom plate 11 are spaced and evenly distributed, so that the elastic members 12 on both sides of the bottom plate 11 can be evenly stressed; preferably, the two ends of the bottom plate 11 are respectively connected to the middle of the connecting structures 33 on both sides, so that the distance between the first plate 31 and the bottom plate 11 is equal to the distance between the second plate 32 and the bottom plate 11, thereby increasing the stability of the overall structure of the elastomer 1.

[0072] Reference Fig.12Another embodiment of the utility model provides a battery module, including the elastomer 1 as described in any of the above embodiments, and also including a plurality of battery cells 2, with one elastomer 1 inserted between every two of the battery cells 2, wherein the sum of the vertical distance from the force-bearing portion 124 of the second elastic member 122 to the bottom plate 11 and the thickness of the bottom plate 11 is less than the spacing between the battery cells 2. The sum of the vertical distance from the force-bearing part 124 of the first elastic member 121 to the bottom plate 11 and the thickness of the bottom plate 11 is greater than the distance between the battery cells 2, so that the first elastic member 121 is first compressed to the distance between the battery cells 2 during insertion, so that the elastic body 1 can be quickly inserted between the battery cells 2; the sum of the vertical distance from the force-bearing part 124 of the second elastic member 122 to the bottom plate 11 and the thickness of the bottom plate 11 is less than the distance between the battery cells 2, so that the second elastic member 122 is not subjected to force in the original state of the battery cells 2 not working, and the elastic force of the elastic body 1 also increases uniformly with the increase of the compression amount when the battery cells 2 are working and expanding; if the vertical distance from the force-bearing part 124 of the second elastic member 122 to the bottom plate 11 is greater than the distance between the battery cells 2, the elastic body 1 will be compressed to the distance between the battery cells 2 when the first elastic member 121 is inserted into the bottom plate 11, so that the elastic body 1 can be quickly inserted into the battery cells 2 ... When the sum of the vertical distance from the force-bearing part 124 of the second elastic member 122 to the bottom plate 11 and the thickness of the bottom plate 11 is equal to the spacing between the battery cells 2, the second elastic member 122 just contacts with the battery cells 2 and is subjected to extrusion force while in contact; it is easy to understand that when the elastic member 12 also includes an outer frame plate 3, the sum of the thickness of the outer frame plate 3, the vertical distance from the force-bearing part 124 of the second elastic member 122 to the bottom plate 11, and the thickness of the bottom plate 11 is less than the distance between the two battery cells 2. At this time, the first elastic member 121 is compressed so that the vertical distance between its force-bearing part 124 to the bottom plate 11 is equal to that of the force-bearing part 124 of the second elastic member 122, and the first elastic member 121 can be placed between the two battery cells 2, so that the operator can quickly insert the elastomer 1 between the two battery cells 2 by sensing the size of the resistance.

[0073] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An elastic body, used for being arranged between the battery cells of a battery cell stack, characterized in that: It comprises a bottom plate and an elastic member, wherein the elastic member is arranged on one side or both sides of the bottom plate, one end of the elastic member is connected to the bottom plate, and the other end is provided with a force-bearing portion for bearing the extrusion force of the battery cell; The elastic member includes a plurality of first elastic members and a plurality of second elastic members, wherein a vertical distance from a force-bearing portion of the first elastic member to the bottom plate is greater than a vertical distance from a force-bearing portion of the second elastic member to the bottom plate.

2. The elastic body according to claim 1, characterized in that The elastic member is a spring sheet.

3. The elastic body according to claim 2, characterized in that The first elastic member and the second elastic member are inclined elastic sheets formed by punching the bottom plate.

4. The elastic body according to claim 3, characterized in that The angles formed by the plurality of first elastic members and the bottom plate are consistent, and the angles formed by the plurality of second elastic members and the bottom plate are consistent.

5. The elastic body according to claim 4, characterized in that The length of the connection between the first elastic member and the bottom plate is smaller than the length of the connection between the second elastic member and the bottom plate.

6. The elastic body according to claim 3, characterized in that The bottom plate is punched to form punched holes corresponding to the inclined spring sheets.

7. The elastic body according to claim 3, characterized in that The elastic members are evenly distributed on the bottom plate.

8. The elastic body according to claim 7, characterized in that One adjacent first elastic member and one adjacent second elastic member form a group, and the first elastic member and the second elastic member in the same group have opposite inclination directions.

9. The elastic body according to claim 1, characterized in that The free end of the elastic member is bent to form a force-bearing portion opening toward the bottom plate.

10. The elastomer according to any one of claims 1 to 9, characterized in that It also includes an outer frame plate, the outer frame plate includes at least a first plate, and the elastic member is arranged toward the first plate; wherein a gap exists between the first plate and the second elastic member.

11. The elastic body according to claim 10, characterized in that The outer frame plate also includes a second plate arranged parallel to the first plate; the edges of the first plate and the second plate are connected by a connecting structure; the bottom plate and the elastic member are clamped between the first plate and the second plate, and the second plate is fitted and fixed to the bottom plate.

12. The elastic body according to claim 11, characterized in that The first plate and / or the second plate are provided with process holes, and the first plate and / or the second plate are connected and fixed to the bottom plate through the process holes.

13. The elastic body according to claim 11, characterized in that The connection structure is any one of a V-shaped plate, a U-shaped plate and an S-shaped plate.

14. The elastic body according to claim 11, characterized in that The first plate, the second plate and the connecting structure are integrally formed.

15. The elastic body according to claim 10, characterized in that Both ends of the bottom plate are provided with a first section, the first section is inclined toward the first plate, and one end of the first section away from the bottom plate extends to have a second section parallel to the bottom plate; The first plate is provided with a hook structure corresponding to the second section, the free end of the second section is hooked in the hook structure, and a movable space for the second section to move is provided in the hook structure.

16. The elastomer according to any one of claims 1 to 9, characterized in that It also includes an outer frame plate, which includes a first plate, a second plate and a connecting structure, the first plate and the second plate are arranged in parallel and connected by the connecting structure; the elastic member is provided on both sides of the bottom plate, the bottom plate and the elastic member are clamped between the first plate and the second plate, and at least one end of the bottom plate is connected to the connecting structure.

17. A battery module, comprising the elastic body according to any one of claims 1 to 16, and a plurality of battery cells, wherein one of the elastic bodies is inserted between every two of the battery cells, wherein: The sum of a vertical distance from the force-bearing portion of the second elastic member to the bottom plate and a thickness of the bottom plate is smaller than a spacing between the battery cells.

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