High-safety module end plate

Abstract

The utility model provides a high-safety module end plate, which belongs to the technical field of energy storage equipment and comprises an end plate body, a deformation accommodating groove is arranged on the plate surface of one side of the end plate body facing to a battery cell, and the deformation accommodating groove is formed by inwards sinking the plate surface of the end plate body and is used for accommodating the swelling capacity of the battery cell. When the battery module is assembled, a plurality of battery cells are clamped between the two module end plates and are fastened through the fastening components, and the side surfaces of the battery cells in contact with the module end plates are parallel to the plate surface of the end plate body, so that the interior of the deformed accommodating groove becomes a hollow area; when the battery module is used, the battery cell expands to enable the side surface, in contact with the module end plate, of the battery cell to deform and gradually enter the deformation accommodating groove, namely the deformation accommodating groove accommodates the expansion amount of the battery cell, so that excessive pressure is prevented from being accumulated in the battery module, the possibility of damage and burst of the battery cell is reduced, and the use safety of the battery module is favorably improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage equipment, and more specifically, relates to a high-safety module end plate. Background Art

[0002] In the new energy industry, battery modules and battery packs, as energy sources, play a pivotal role. As customer demand continues to increase, the production cost, safety quality and overall weight of the modules are more clearly defined, and the demand for lightweighting continues to increase. Battery modules are usually composed of a collection of multiple battery cells stacked in series or in parallel. The battery cells will expand during use, so it is necessary to apply a compressive force to them through a bundling structure to alleviate the expansion of the battery cells, improve the stability of battery use, and extend its service life.

[0003] At present, the end plates in the battery module fixing components are basically made of metal materials to ensure the rigidity of the module. However, due to the excessive rigidity of aluminum alloy and sheet metal, the end plates of this design cannot completely absorb the expansion force generated by the battery when the battery module is working, resulting in most of the expansion force acting directly on the welding point between the battery cell and the CCS. The expansion force will then reach the point where the cable tie is stressed. When the expansion force exceeds the connection strength of the welding surface (point), the welding surface will be damaged, resulting in cold welding, the welding surface being pulled apart (disconnected), etc., which will eventually lead to failure of the battery module. Utility Model Content

[0004] The utility model aims to provide a highly safe module end plate to solve the technical problem in the prior art that the end plate of the battery module has poor ability to absorb the expansion force generated when the battery is working.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a high-safety module end plate, including an end plate body, and a deformation accommodating groove is provided on the plate surface of the end plate body facing the battery cell. The deformation accommodating groove is formed by the inward depression of the plate surface of the end plate body to accommodate the expansion of the battery cell.

[0006] In combination with the above technical solution, in a possible implementation, the area of ​​the deformation accommodating groove accounts for 30% to 60% of the surface area of ​​the end plate body; the angle between the line from the edge of the deformation accommodating groove to the bottom and the surface of the end plate body is 1° to 5°.

[0007] In combination with the above technical solution, in a possible implementation manner, the deformation accommodating groove is arranged at the center of the plate surface of the end plate body facing the battery cell, and the deformation accommodating groove is an axisymmetric and center-symmetrical structure.

[0008] In combination with the above technical solution, in a possible implementation method, the deformation accommodating groove has a smooth transition from the plate surface of the end plate body to the center of the deformation accommodating groove, and the edge of the deformation accommodating groove is a smooth and rounded shape such as a circle, an ellipse or a rounded rectangle.

[0009] In combination with the above technical solution, in a possible implementation, the deformation accommodating groove is a plurality of grooves arranged on the end plate body; the plurality of deformation accommodating grooves are arranged in an array on the end plate body.

[0010] In combination with the above technical solution, in a possible implementation manner, a porous cushion layer is provided on the plate surface of the end plate body and in the deformation accommodating groove.

[0011] In combination with the above technical solution, in a possible implementation manner, a cooling channel is provided in the end plate body.

[0012] In combination with the above technical solution, in a possible implementation, the end plate body is a plastic structural member.

[0013] In combination with the above technical solution, in a possible implementation method, the high-safety module end plate also has a frame and reinforcing ribs. The frame is arranged at the edge of the side of the end plate body facing away from the battery cell, and the frame is provided with a recess and a slot. The recess is arranged at the top of the frame and passes through the end plate body. The slot is vertically arranged at the bottom of the recess for vertically inserting the electrode terminal; the reinforcing ribs are arranged in the space enclosed by the end plate body and the frame, and are respectively connected to the end plate body and the frame.

[0014] In combination with the above technical solution, in a possible implementation method, a vertical groove is provided on the inner wall of the slot; a lifting through hole is provided on the side wall of the slot; the recess separates an ear piece on one side of the top of the end plate body, and the ear piece is a plate-like structure for attaching to the battery cell; assembly holes are provided on both sides of the frame, and the assembly holes are vertically arranged at the position of the ear piece on the frame; two recesses and a slot are provided at intervals on the top of the frame; and cable tie limit protrusions are provided on both sides of the frame.

[0015] The beneficial effect of the high-safety module end plate provided by the utility model is that compared with the prior art, when the battery module is assembled, the utility model clamps a plurality of battery cells between two module end plates and fastens them by a fastening assembly, and the side surfaces of the battery cells contacting the module end plates are parallel to the plate surfaces of the end plate bodies, so that the deformation accommodating grooves become hollow areas; and when the battery module is in use, the battery cells expand, so that the side surfaces of the battery cells contacting the module end plates are deformed and gradually enter the deformation accommodating grooves, that is, the deformation accommodating grooves accommodate the expansion of the battery cells, thereby avoiding the accumulation of excessive pressure in the battery module, reducing the possibility of battery cell damage and explosion, and being beneficial to improving the safety of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A schematic structural diagram of a high-safety module end plate provided by an embodiment of the utility model;

[0018] Figure 2 A schematic structural diagram of a high-safety module end plate provided in another embodiment of the utility model.

[0019] Among them, the reference numerals in the figure are as follows:

[0020] 11. end plate body; 111. ear piece; 112. connection hole; 113. top column; 114. deformation accommodating groove;

[0021] 12, frame; 121, notch; 122, slot; 123, groove;

[0022] 124, lifting hole; 125, assembly hole; 126, cable tie limiting protrusion;

[0023] 13. Strengthen the ribs. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are only part of the embodiments of the present application, not all of the embodiments, and the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0025] It should be further explained that the drawings and implementation modes of the present invention mainly describe the concept of the present invention. On the basis of this concept, some specific forms and settings of connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, on the premise that those skilled in the art understand the concept of the present invention, those skilled in the art can implement the above-mentioned specific forms and settings in a well-known manner.

[0026] When an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0027] The directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself. The directions or positional relationships indicated by the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0028] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, and the spatially relative descriptions used here are interpreted accordingly.

[0029] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. 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, "multiple" means two or more, and "several" means one or more, unless otherwise clearly and specifically defined.

[0030] The high-safety module end plate provided by the utility model is now described.

[0031] like Figure 1 As shown, the first embodiment of the utility model provides a high-safety module end plate, including an end plate body 11, and a deformation accommodating groove 114 is provided on the plate surface of the end plate body 11 facing the battery cell. The deformation accommodating groove 114 is formed by the inward depression of the plate surface of the end plate body 11 to accommodate the expansion of the battery cell.

[0032] Compared with the prior art, the high-safety module end plate provided in the present embodiment has the following characteristics: when the battery module is assembled, a plurality of battery cells are clamped between two module end plates and fastened by a fastening assembly, and the side surfaces of the battery cells contacting the module end plates are parallel to the plate surface of the end plate body 11, so that the deformation accommodating groove 114 becomes a hollow area; when the battery module is in use, the battery cells expand, causing the side surfaces of the battery cells contacting the module end plates to deform and gradually enter the deformation accommodating groove 114, that is, the deformation accommodating groove 114 accommodates the expansion of the battery cells, thereby avoiding excessive pressure accumulation in the battery module, reducing the possibility of battery cell damage and explosion, and helping to improve the safety of battery module use.

[0033] like Figure 1 As shown, the utility model provides a specific implementation method based on the first implementation method as follows:

[0034] The area of ​​the deformation accommodating groove 114 accounts for 30% to 60% of the surface area of ​​the end plate body 11. If the area of ​​the deformation accommodating groove 114 is too large, the battery cell will gradually deform and sink into the deformation accommodating groove 114 during the assembly and binding process, and the battery cell will easily loosen and fall off during use, causing the deformation accommodating groove 114 to lose its function. If the area of ​​the deformation accommodating groove 114 is too small, it is difficult to accommodate deformation. The angle between the line from the edge of the deformation accommodating groove 114 to the bottom and the surface of the end plate body 11 is 1° to 5°. If the angle is too small, the capacity of the deformation accommodating groove 114 is limited, making it difficult to accommodate deformation. If the angle is too large, the battery cell is easily damaged due to excessive deformation.

[0035] The deformation accommodating groove 114 is disposed at the center of the plate surface of the end plate body 11 facing the battery cell, and the deformation accommodating groove 114 is an axisymmetric and center-symmetrical structure, so that the battery cell can expand evenly and reduce stress concentration.

[0036] The deformation accommodating groove 114 has a smooth transition from the plate surface of the end plate body 11 to the center of the deformation accommodating groove 114. The edge of the deformation accommodating groove 114 is a smooth and rounded shape such as a circle, an ellipse or a rounded rectangle to avoid damage to the protective film outside the battery cell due to stress concentration at the corners.

[0037] In other embodiments, the deformation accommodating grooves 114 are arranged in plurality on the end plate body 11 ; the plurality of deformation accommodating grooves 114 are arranged in an array on the end plate body 11 .

[0038] A porous cushion layer is provided on the plate surface of the end plate body 11 and in the deformation accommodating groove 114, so as to form an air flow channel between the battery cell and the end plate body 11 while providing buffering and insulation. When the battery cell expands, the gas in the deformation accommodating groove 114 can be discharged through the porous cushion layer to avoid pressure accumulation. After the battery cell contracts, the deformation accommodating groove 114 can inhale a certain amount of air to prevent the deformation accommodating groove 114 from adsorbing the protective film outside the battery cell.

[0039] A cooling channel is provided in the end plate body 11. Low-temperature liquid or gas can be introduced into the cooling channel to reduce the temperature, thereby reducing the temperature of the battery core contacting the end plate body 11, thereby reducing the expansion of the battery core.

[0040] The end plate body 11 is a plastic structural part. Using a plastic structure to replace the metal end plate 10 is not only low in cost, but also conducive to reducing the overall weight of the battery module, thereby increasing the energy density of the battery module, and the rigidity is reduced, and it has a certain resilience, and can recover to its original shape after elastic deformation, so it can absorb well when the battery module expands, effectively increasing the service life of the battery module, and it also has good insulation performance, which can prevent the battery module from causing accidental short circuit or electric shock during operation, thereby improving the safety performance of the battery module.

[0041] like Figure 2 As shown, the utility model provides a specific implementation method based on the first implementation method as follows:

[0042] The end plate 10 includes an end plate body 11, a frame 12 and a reinforcing rib 13. The frame 12 is arranged at the edge of the side of the end plate body 11 facing away from the battery cell, and a notch 121 and a slot 122 are provided on the frame 12. The notch 121 is arranged at the top of the frame 12 and passes through the end plate body 11. The slot 122 is vertically arranged at the bottom of the notch 121 for vertically inserting the electrode terminal 20. The reinforcing rib 13 is arranged in the space enclosed by the end plate body 11 and the frame 12, and is respectively connected to the end plate body 11 and the frame 12.

[0043] By setting the recess 121 and the slot 122 on the top of the frame 12, the electrode terminal 20 can be directly installed from the recess 121 to the slot 122 by inserting from top to bottom without any obstruction. Therefore, the size of the slot 122 can be designed to fit the electrode terminal 20 more closely to avoid loosening of the electrode terminal 20 after installation. After installation, the upper part of the electrode terminal 20 is located in the recess 121 with a larger exposed surface, which can not only be conveniently connected to the integrated busbar 30, but also facilitate the reinforcement between the electrode terminal 20 and the integrated busbar 30, thereby reducing the possibility of breakage between the two.

[0044] A vertical groove 123 is provided on the inner wall of the slot 122 so that when the slot 122 is designed to be relatively tight, a certain margin can be provided, and it is convenient to exhaust air when the electrode terminal 20 is inserted into the slot 122, so as to facilitate the assembly and positioning of the electrode terminal 20.

[0045] A lifting through hole 124 is provided on the side wall of the slot 122 , which can facilitate the lifting and transfer of the module end plate on the one hand, and can exhaust air when inserting the electrode terminal 20 into the slot 122 on the other hand, so as to facilitate the assembly and positioning of the electrode terminal 20 .

[0046] The notch 121 separates one side of the top of the end plate body 11 into an ear piece 111. The ear piece 111 is a plate-like structure and is used to be attached to the battery cell. On the one hand, it can enhance the protection of the battery cell. On the other hand, it can avoid that the side of the upper part of the electrode terminal 20 close to the ear piece 111 is empty, which is convenient for the connection and reinforcement of the electrode terminal 20 and the integrated busbar 30, so as to reduce the possibility of breakage at the connection between the electrode terminal 20 and the integrated busbar 30.

[0047] Specifically, the electrode terminal 20 currently used generally includes a terminal seat and a terminal cover, and the connector of the integrated busbar 30 is clamped between the terminal seat and the terminal cover. The space provided by the ear piece 111 can be used to add clamps, reinforced welds and other reinforcement structures or components on the basis of the terminal seat and the terminal cover to enhance the connection strength between the electrode terminal 20 and the integrated busbar 30.

[0048] Assembly holes 125 are provided on both sides of the frame 12. The assembly holes 125 are vertically arranged at positions on the frame 12 corresponding to the ear pieces 111. The assembly holes 125 are used to position and fix the module end plates by inserting the positioning components on the assembly equipment when assembling the battery module. The assembly holes 125 are arranged corresponding to the ear pieces 111, so that the ear pieces 111 can be located between the positioning components and the battery cells, thereby playing a certain protective role and preventing the battery cells from being bumped when the positioning components are pulled out.

[0049] Two notches 121 and a slot 122 are provided at intervals on the top of the frame 12, so that the electrode terminal 20 can be inserted into one of the slots 122 as needed, so that the module end plate can be set on any side of the battery module; tie limit protrusions 126 are provided on both sides of the frame 12 to limit the position of the tie on the frame 12 to prevent the position of the tie from moving after the battery module is assembled.

[0050] The reinforcing ribs 13 include a plurality of transverse reinforcing ribs, a plurality of longitudinal reinforcing ribs and a plurality of oblique reinforcing ribs. The transverse reinforcing ribs and the longitudinal reinforcing ribs are staggered to form a rectangular grid structure. The oblique reinforcing ribs are arranged in the grids at the four corners of the end plate body 11 to reinforce the four corners of the end plate body 11.

[0051] A connection hole 112 is provided in the middle of the end plate body 11 , and the connection hole 112 is connected to the reinforcing rib 13 to increase strength. The connection hole 112 is used to connect the module end plate to the shell of the battery module.

[0052] A top column 113 is provided around the connection hole 112, and the top column 113 is respectively connected to the end plate body 11 and the reinforcing rib 13. The top column 113 is used to abut against the corresponding protrusions on the shell of the battery module to play a supporting role when the module end plate is connected to the shell of the battery module through the connection hole 112, so as to improve the stability of the structure.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-safety module end plate, characterized in that: include: The end plate body (11) is provided with a deformation accommodating groove (114) on the plate surface facing the battery cell, wherein the deformation accommodating groove (114) is formed by inward depression of the plate surface of the end plate body (11) to accommodate the expansion of the battery cell; The high-safety module end plate further comprises a frame (12) and a reinforcing rib (13); the frame (12) is arranged at the edge of the side of the end plate body (11) facing away from the battery cell, and the frame (12) is provided with a notch (121) and a slot (122); the notch (121) is arranged at the top of the frame (12) and passes through the end plate body (11); the slot (122) is vertically arranged at the bottom of the notch (121) and is used for vertically inserting the electrode terminal (20); the reinforcing rib (13) is arranged in a space enclosed by the end plate body (11) and the frame (12), and is respectively connected to the end plate body (11) and the frame (12).

2. The high-safety module end plate according to claim 1, characterized in that: The area of ​​the deformation accommodating groove (114) accounts for 30% to 60% of the plate surface area of ​​the end plate body (11); and the angle between the line from the edge of the deformation accommodating groove (114) to the bottom and the plate surface of the end plate body (11) is 1° to 5°.

3. The high-safety module end plate according to claim 1, characterized in that: The deformation accommodating groove (114) is arranged at the center of a plate surface of the end plate body (11) on one side facing the battery core, and the deformation accommodating groove (114) is an axisymmetric and center-symmetrical structure.

4. The high-safety module end plate according to claim 1, characterized in that: The deformation accommodating groove (114) smoothly transitions from the plate surface of the end plate body (11) to the center of the deformation accommodating groove (114), and the edge of the deformation accommodating groove (114) is circular, elliptical or rounded rectangular.

5. The high-safety module end plate according to claim 1, characterized in that: The deformation accommodating grooves (114) are multiple and arranged on the end plate body (11); the multiple deformation accommodating grooves (114) are arranged in an array on the end plate body (11).

6. The high-safety module end plate according to claim 1, characterized in that: A porous cushion layer is provided on the plate surface of the end plate body (11) and in the deformation accommodating groove (114).

7. The high-safety module end plate according to claim 1, characterized in that: A cooling channel is provided in the end plate body (11).

8. The high-safety module end plate according to claim 1, characterized in that: The end plate body (11) is a plastic structural component.

9. The high-safety module end plate according to claim 1, characterized in that: A vertical groove (123) is provided on the inner wall of the slot (122); a lifting through hole (124) is provided on the side wall of the slot (122); the recess (121) separates a lug (111) from one side of the top of the end plate body (11); the lug (111) is a plate-shaped structure and is used to be attached to the battery cell; assembly holes (125) are provided on both sides of the frame (12); the assembly holes (125) are vertically arranged at positions on the frame (12) corresponding to the lug (111); two recesses (121) and the slot (122) are provided at intervals on the top of the frame (12); and tie-tie limiting protrusions (126) are provided on both sides of the frame (12).

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