Battery cell module

Abstract

The utility model discloses a battery cell module which comprises a plurality of battery cells, the plurality of battery cells are connected in series or in parallel through a plurality of connecting rows, a positive electrode row is connected to a positive electrode of a head battery cell which is combined in series or in parallel, and a negative electrode row is connected to a negative electrode of a tail battery cell which is combined in series or in parallel; the bottoms of the battery cells are positioned through a lower bracket, the tops are positioned through an upper bracket, and the battery cells are fixed after the upper bracket and the lower bracket are locked; an elastic piece is arranged at the bottom of the battery cell and is cushioned between the bottom surface of the battery cell and the lower bracket. The elastic pieces are arranged at the bottoms of the battery cells and can absorb dimensional tolerance of the battery cells, the lower support, the upper support and the like, so that the heights of welding surfaces of the battery cells are kept consistent, meanwhile, counter-acting force generated in the compression process of the elastic pieces plays a role in supporting the battery cells, and the battery cells are prevented from being damaged. Welding defects such as insufficient welding during welding of the connecting bar and the battery cell are prevented, the welding quality is ensured, and the safety performance of the battery cell module is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric energy storage module, especially a battery module. BACKGROUND

[0002] The electric energy storage device has superior characteristics such as extremely high efficiency, high current capacity, wide voltage range, wide use temperature range, long use life, long working life, maintenance-free, simple integration, low cost and the like, and has broad development prospects.

[0003] The energy storage module is one of electric energy storage devices, and has high energy density and long service life as an energy storage unit commonly used in power grids.

[0004] The existing energy storage module is usually fixed by two plastic supports above and below the cylindrical battery cell, and the bus bar is welded on one side or both sides of the battery cell. When single-sided laser welding is used, due to the assembly tolerance of the battery cell and the plastic support, the welding surfaces of the two adjacent battery cells will be uneven, which will cause welding defects such as virtual welding of the bus bar and the battery cell. Virtual welding can cause overheating, and in severe cases, it can cause safety accidents of the battery pack. UTILITY MODEL CONTENTS

[0005] The applicant provides a battery module with a reasonable structure to solve the above problems of the existing energy storage module. An elastic member is arranged at the bottom of the battery cell to ensure the uniform height of the welding surface of the battery cell, avoid welding defects, and improve the safety performance of the battery module.

[0006] The technical scheme adopted by the utility model is as follows:

[0007] A battery module includes a plurality of battery cells, the plurality of battery cells are connected in series or parallel through a plurality of connection bars, a positive electrode bar is connected to the positive electrode of the first battery cell in series combination or parallel combination, and a negative electrode bar is connected to the negative electrode of the last battery cell in series combination or parallel combination; the plurality of battery cells are positioned by a lower support at the bottom and positioned by an upper support at the top, and the plurality of battery cells are fixed after the upper support and the lower support are locked; an elastic member is arranged at the bottom of the battery cell, and the elastic member is arranged between the bottom surface of the battery cell and the lower support.

[0008] As a further improvement of the above technical scheme:

[0009] A clearance hole is formed in the elastic member, and the clearance hole has a diameter greater than the outer diameter of the pole at the bottom of the battery cell.

[0010] The elastic member is an independent piece placed between the battery cell and the lower support, or the elastic member is embedded in the lower support, or the elastic member is integrally formed on the lower support.

[0011] The thickness of the elastic member is between 1.3-2mm.

[0012] The elastic member is made of elastic foam, and the elastic foam material is flame-retardant CR foam or rubber-like material.

[0013] A plurality of connecting columns are arranged on the lower support, and a plurality of insertion sleeves are arranged on the lower support correspondingly, the connecting columns are inserted into the insertion sleeves, and are locked through fasteners.

[0014] A plurality of guide ribs are arranged on the outer periphery of the connecting part at the top end of the connecting column, and the guide ribs are triangular ribs with gradually increasing thickness from top to bottom; a plurality of reinforcing ribs are arranged on the outer periphery of the column part of the connecting column.

[0015] A plurality of lower positioning grooves are arranged on the lower support correspondingly to the plurality of battery cells, and a lower supporting rib is arranged at the groove bottom of the lower positioning groove; the lower end part of the battery cell is inserted into the lower positioning groove, and the elastic member is located between the bottom surface of the battery cell and the lower supporting rib; the outer diameter of the elastic member is less than or equal to the inner diameter of the lower positioning groove.

[0016] A plurality of upper positioning grooves are arranged on the upper support correspondingly to the plurality of battery cells, and an upper supporting rib is arranged at the groove bottom of the upper positioning groove.

[0017] Corresponding to the plurality of connecting rows, the positive electrode row and the negative electrode row, a through clamping groove is arranged on the upper support, and the connecting row, the positive electrode row and the negative electrode row are connected with the battery cell at the corresponding clamping groove; the connecting row, the positive electrode row and the negative electrode row are connected at the same end of the battery cell.

[0018] The beneficial effects of the utility model are as follows:

[0019] The utility model discloses the bottom of the battery cell is provided with the elastic member, the elastic member has compressibility, when the battery cell is fixed by locking the lower support and the upper support, the elastic member is compressed, the elastic member can utilize the elastic deformation to absorb the size tolerance of the battery cell, the lower support and the upper support in the compression process, thereby guaranteeing that the height of the welding surface of each battery cell remains consistent, simultaneously, the reaction force generated in the compression process of the elastic member plays a supporting role to the battery cell, guarantees that the battery cell does not produce shaking or deviation in the upper support, prevents the welding defects such as virtual welding from appearing when the connecting row and the battery cell are welded, guarantees the welding quality, and improves the safety performance of the battery cell module. DRAWINGS

[0020] Figure 1 It is the explosion diagram of the utility model.

[0021] Figure 2 It is the perspective view of the utility model.

[0022] Figure 3 It is the sectional view of the utility model.

[0023] Figure 4 It is Figure 3Enlarged view at B.

[0024] Figure 5 is a perspective view of the lower support.

[0025] Figure 6 is Figure 5 Enlarged view at B.

[0026] Figure 7 is a perspective view of the upper support.

[0027] In the figure: 1, the cell; 2, the lower support; 21, the connecting column; 211, the guide rib; 212, the reinforcing rib; 22, the lower positioning groove; 23, the lower supporting rib; 3, the upper support; 31, the insertion cylinder; 32, the upper positioning groove; 33, the upper supporting rib; 34, the clamping groove; 4, the connecting row; 5, the positive row; 6, the negative row; 7, the elastic piece; 71, the accommodation hole. DETAILED DESCRIPTION

[0028] The specific implementation of the present application will be described below in conjunction with the accompanying drawings.

[0029] As Figures 1 to 3 shown, the cell module comprises a plurality of cells 1, the bottom of the plurality of cells 1 is positioned by a lower support 2, the top of the plurality of cells 1 is positioned by an upper support 3, the upper support 3 is fixedly connected with the lower support 2 through a fastener, and the plurality of cells 1 are pressed and fixed after the upper support 3 is fixedly connected with the lower support 2. The plurality of cells 1 are connected in series or parallel through a plurality of connecting rows 4, the positive electrode of the first cell 1 of the series combination or parallel combination is connected with a positive row 5, and the negative electrode of the tail cell 1 of the series combination or parallel combination is connected with a negative row 6. The connecting row 4, the positive row 5 and the negative row 6 are connected at the same end of the cell 1, and in the embodiment, the three are connected at the top end of the cell 1.

[0030] As Figure 1 , Figure 3 , Figure 4As shown, the bottom of the battery cell 1 is provided with an elastic member 7, which is arranged between the bottom surface of the battery cell 1 and the lower support 2. A clearance hole 71 is formed in the elastic member 7, and the diameter of the clearance hole 71 is greater than the outer diameter of the bottom pole of the battery cell 1, so that the bottom pole of the battery cell 1 can pass through the clearance hole 71. In this embodiment, the elastic member 7 is a separate member arranged between the battery cell 1 and the lower support 2. In other embodiments, the elastic member 7 can be arranged on the lower support 2, embedded in the lower support 2, or integrally formed on the lower support 2 as a part of the lower support 2. The elastic member 7 is compressible. When the lower support 2 and the upper support 3 are locked to fix the battery cell 1, the elastic member 7 is compressed. During the compression process, the elastic member 7 can absorb the dimensional tolerance of the battery cell 1, the lower support 2, the upper support 3, etc. by elastic deformation, thereby ensuring that the heights of the welding surfaces of the battery cells 1 remain consistent. At the same time, the reaction force generated during the compression process of the elastic member 7 supports the battery cell 1, ensuring that the battery cell 1 does not shake or deviate in the upper support 3, preventing virtual welding and other welding defects when the connecting row 4 is welded with the battery cell 1, ensuring the welding quality and improving the safety performance of the battery cell module. The thickness of the elastic member 7 is between 1.3-2mm, and at this time the compression amount of the foam is 25%-50%, which can absorb the tolerance and provide stable supporting reaction force to ensure the stability and reliability of the structure. The elastic member 7 can be made of elastic foam, and the material of the elastic foam can be CR foam (general-purpose special rubber), which is flame-retardant. The material of the elastic foam can also be other rubber materials, such as polyurethane and silicone rubber. The elastic member 7 can also be made of a metal elastic structure, such as a spring or a reed. The elastic member 7 made of a metal elastic structure needs to be surface-insulated to meet the insulation requirements.

[0031] As shown in Figure 5 , Figure 6 , a plurality of connecting columns 21 vertically extend upward from the lower support 2. A plurality of vertical guide ribs 211 are uniformly arranged on the outer periphery of the connecting part at the top end of the connecting column 21, and the guide ribs 211 are triangular ribs with gradually increasing thickness from top to bottom. A plurality of reinforcing ribs 212 are arranged on the outer periphery of the column part of the connecting column 21, which can improve the strength of the connecting column 21 and improve the connection stability and reliability. Figure 7 As shown in Figure 2 , the plug cylinder 31 of the upper support 3 corresponds to the connecting column 21 of the lower support 2, the connecting part at the top end of the connecting column 21 is inserted into the plug cylinder 31, and is locked by a fastener. The plurality of guide ribs 211 can guide the connecting part to be inserted into the plug cylinder 31, which is more convenient for the connection of the connecting column 21 and the plug cylinder 31, and ensures the connection stability and reliability.

[0032] As shown in Figure 5As shown, the lower support 2 is provided with a plurality of lower positioning grooves 22 corresponding to the plurality of battery cells 1, and the groove bottom of the lower positioning groove 22 is provided with a lower supporting rib 23 protruding upward. Figures 2 to 4 As shown, the lower end of the battery cell 1 is inserted into the lower positioning groove 22, and the elastic member 7 at the bottom of each battery cell 1 is arranged in the lower positioning groove 22 and located between the bottom surface of the battery cell 1 and the lower supporting rib 23, and the lower supporting rib 23 supports the bottom surface of the battery cell 1 through the elastic member 7. The outer diameter of the elastic member 7 is less than or equal to the inner diameter of the lower positioning groove 22.

[0033] As shown, Figure 7 As shown, the upper support 3 is provided with a plurality of upper positioning grooves 32 corresponding to the plurality of battery cells 1, and the groove bottom of the upper positioning groove 32 is provided with an upper supporting rib 33 protruding downward. Figure 2 、 Figure 3 As shown, the upper end of the battery cell 1 is inserted into the upper positioning groove 32, and the upper supporting rib 33 abuts against the top surface of the battery cell 1. Figure 1 、 Figure 2 、 Figure 7 As shown, the upper support 3 is provided with a plurality of through clamping grooves 34 corresponding to the plurality of connecting rows 4, the positive electrode row 5 and the negative electrode row 6, and the connecting row 4, the positive electrode row 5 and the negative electrode row 6 are connected to the battery cell 1 at the corresponding clamping grooves 34, and the connecting row 4, the positive electrode row 5 and the negative electrode row 6 are fixed to the battery cell 1 by welding.

[0034] The above description is an explanation of the utility model, not a limitation of the utility model, and the utility model can be modified in any form without departing from the spirit of the utility model.

Claims

1. A battery cell module comprising a plurality of battery cells (1) connected in series or in parallel by a plurality of connection strips (4), a positive strip (5) connected to the positive pole of the first battery cell (1) of the series combination or the parallel combination, and a negative strip (6) connected to the negative pole of the last battery cell (1) of the series combination or the parallel combination; characterized in that: The bottom of the plurality of battery cells (1) is positioned by the lower support (2), and the top is positioned by the upper support (3), and the upper support (3) is locked with the lower support (2) to fix the plurality of battery cells (1); the bottom of the battery cell (1) is provided with an elastic element (7), and the elastic element (7) is arranged between the bottom surface of the battery cell (1) and the lower support (2).

2. The battery cell module of claim 1, wherein: The elastic element (7) is provided with a clearance hole (71), and the clearance hole (71) has a diameter greater than the outer diameter of the bottom pole of the battery cell (1).

3. The battery cell module of claim 1, wherein: The elastic element (7) is an independent piece placed between the battery cell (1) and the lower support (2); or the elastic element (7) is embedded in the lower support (2); or the elastic element (7) is integrally formed on the lower support (2).

4. The battery cell module of claim 1, wherein: The thickness of the elastic element (7) is between 1.3-2mm.

5. The battery cell module of claim 1, wherein: The elastic element (7) is made of elastic foam, and the elastic foam material is flame-retardant CR foam or rubber-like material; or the elastic element (7) is a metal elastic structure, and the surface of the elastic element (7) is insulated.

6. The battery cell module of claim 1, wherein: The lower support (2) is provided with a plurality of connecting columns (21), and the lower support (2) is provided with a plurality of insertion sleeves (31) corresponding to the connecting columns (21), the connecting columns (21) are inserted into the insertion sleeves (31), and are locked by fasteners.

7. The battery cell module of claim 6, wherein: The connecting part of the connecting column (21) is provided with a plurality of guide ribs (211) on the outer periphery, and the guide ribs (211) are triangular ribs with gradually increasing thickness from top to bottom; the column part of the connecting column (21) is provided with a plurality of reinforcing ribs (212) on the outer periphery.

8. The battery cell module of claim 1, wherein: The lower support (2) is provided with a plurality of lower positioning grooves (22) corresponding to the plurality of battery cells (1), and the groove bottom of the lower positioning groove (22) is provided with a lower supporting rib (23); the lower end of the battery cell (1) is inserted into the lower positioning groove (22), and the elastic element (7) is located between the bottom surface of the battery cell (1) and the lower supporting rib (23); the outer diameter of the elastic element (7) is less than or equal to the inner diameter of the lower positioning groove (22).

9. The battery cell module of claim 1, wherein: The upper support (3) is provided with a plurality of upper positioning grooves (32) corresponding to the plurality of battery cells (1), and the groove bottom of the upper positioning groove (32) is provided with an upper supporting rib (33).

10. The battery cell module of claim 1, wherein: The upper support (3) is provided with a through clamping groove (34) corresponding to the plurality of connecting rows (4) and the positive electrode row (5) and the negative electrode row (6), and the connecting row (4), the positive electrode row (5) and the negative electrode row (6) are connected with the battery cell (1) at the corresponding clamping groove (34); the connecting row (4), the positive electrode row (5) and the negative electrode row (6) are connected at the same end of the battery cell (1).

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