Pressure applying device for battery cell

Abstract

The utility model provides a pressure applying device for a battery cell, which comprises a placing rack, the placing rack is provided with a fixing position for placing the battery cell, the pressure applying device further comprises a pressure applying mechanism, the pressure applying mechanism comprises two pressure applying assemblies, and the two pressure applying assemblies are oppositely arranged on two sides of the placing rack. And the two pressurizing assemblies are used for laterally pressurizing the battery cells on the fixing positions. Through the arrangement of the placing frame and the pressurizing mechanism, the placing frame is provided with the fixing position for placing the battery cell and the two pressurizing assemblies of the pressurizing mechanism, when the two pressurizing assemblies horizontally move towards the fixing position at the same time, the two pressurizing assemblies are used for laterally pressing the battery cell on the fixing position, so that the response of the battery cell when the battery cell is laterally pressed is tested, and the performance of the battery cell is more comprehensively determined.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a pressure-applying device for a battery cell. Background Art

[0002] The battery cell is a common battery structure, usually used in rechargeable batteries such as lithium-ion batteries or nickel-metal hydride batteries. It consists of a hollow shell with positive and negative electrode materials, electrolytes and separators inside. It has the advantages of high energy density, good heat dissipation performance and impact resistance, and is widely used in mobile electronic devices, power tools, electric vehicles and other fields.

[0003] In order to evaluate the safety performance of battery cells, they are sometimes subjected to pressure tests to detect their response and stability when subjected to external pressure. This can help determine the battery's structural strength, sealing performance, and ability to avoid accidents. However, general pressure testing devices apply longitudinal pressure to the battery cells, and lack performance tests for lateral pressure on the battery cells. As a result, existing pressure tests cannot better reflect the stability of the battery cells when under pressure. Utility Model Content

[0004] The technical problem to be solved by the utility model is how to improve the stability of the battery core under pressure.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A pressure device for a battery cell is provided, comprising a placement rack, wherein the placement rack is provided with a fixed position for placing the battery cell, and a pressure mechanism, wherein the pressure mechanism comprises two pressure components, wherein the two pressure components are relatively arranged on both sides of the placement rack, and the two pressure components can move relatively.

[0007] By setting up a placement rack and a pressurizing mechanism, wherein the placement rack is provided with a fixed position for placing the battery cell, and the pressurizing mechanism has two pressurizing components, which, when the two pressurizing components move horizontally toward the fixed position at the same time, are used to apply lateral pressure to the battery cell on the fixed position to test the response of the battery cell when subjected to lateral pressure, so as to more comprehensively determine the performance of the battery cell.

[0008] Furthermore, the two pressurizing components are provided with a pressurizing portion, and a plurality of pressurizing grooves are provided on opposite sides of the pressurizing portion, and the pressurizing grooves are used to accommodate the battery cells for lateral pressure application.

[0009] Furthermore, the placement rack includes a top plate, a bottom plate, and guide columns arranged between the top plate and the bottom plate, the guide columns are respectively fixed to the bottom plate, and the top plate can be slidably arranged on the guide columns.

[0010] Furthermore, magnetic components are provided at the top ends of the two guide posts, and the top plate is fixed to the guide posts via the magnetic components.

[0011] Furthermore, the top plate is provided with a plurality of protrusions, and the bottom plate is provided with a plurality of grooves arranged at positions opposite to the protrusions.

[0012] Furthermore, the transmission member is connected to the pressurizing part, the driving member drives the transmission member to rotate, and the transmission member drives the pressurizing part to apply lateral pressure to the battery cell on the fixed position.

[0013] Furthermore, the transmission member includes a gear, two racks and two connecting rods, the gear and the two racks are meshed to form a rack pair, the connecting rod is connected to the end of the rack, and the connecting rod is fixed to the pressurizing part.

[0014] Furthermore, the transmission member also includes a linear bearing, and the linear bearing is slidably connected to the connecting rod.

[0015] Furthermore, it also includes a base, the base is provided with a chamber for accommodating the driving member and the transmission member, the side of the base is provided with an opening, and the rack connected to the connecting rod part extends out of the opening.

[0016] Furthermore, the pressurizing portion is a pressurizing block in the shape of a quadrangular pyramid, and the volume of the pressurizing block gradually increases in a direction approaching the fixing position.

[0017] The beneficial effects of the utility model are:

[0018] (1) A placement rack and a pressurizing mechanism are provided, wherein the placement rack is provided with a fixed position for placing the battery cell, and the pressurizing mechanism has two pressurizing components. When the two pressurizing components move horizontally toward the fixed position at the same time, they are used to apply lateral pressure to the battery cell on the fixed position to test the response of the battery cell when subjected to lateral pressure, so as to more comprehensively determine the performance of the battery cell.

[0019] (2) By setting a linear bearing and passing the connecting rod through the linear bearing, rolling friction is formed between the linear bearing and the connecting rod, which can provide an upward supporting force to the connecting rod on the one hand and reduce friction on the other hand. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The specific structure of the utility model is described in detail below with reference to the accompanying drawings

[0021] Figure 1 A schematic diagram of the structure of a lateral pressure device for a battery cell provided by the utility model;

[0022] Figure 2 This is a first structural schematic diagram of a placement rack in a lateral pressure-applying device for a battery cell provided by the utility model;

[0023] Figure 3 A second structural schematic diagram of a placement rack in a lateral pressure-applying device for a battery cell provided by the utility model;

[0024] Figure 4 A partial cross-sectional view of a placement rack in a lateral pressure-applying device for a battery cell provided by the utility model;

[0025] Figure 5 A schematic diagram of the structure of a pressure mechanism in a lateral pressure device for a battery cell provided by the utility model;

[0026] Figure 6 The utility model is a schematic diagram of the structure of a pressurizing component in a lateral pressure-applying device for a battery cell provided by the utility model.

[0027] Description of Reference Numerals

[0028] 1-base; 101-chamber; 102-notch; 2-placing rack; 201-top plate; 202-bottom plate; 203-guide column; 204-buckle cap; 205-groove; 206-mounting block; 207-pad; 208-magnet; 3-pressurizing mechanism; 301-transmission member; 3011-gear; 3012-rack; 3013-connecting rod; 3014-linear bearing; 3015-cylinder; 3016-connecting block; 302-pressurizing block; 3021-pressurizing slot; 4-battery cell. DETAILED DESCRIPTION

[0029] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] See also Figure 1 An embodiment of the utility model provides a pressure-applying device for a battery cell, and the pressure-applying device for the battery cell includes a base 1 , a placement rack 2 and a pressure-applying mechanism 3 .

[0032] Furthermore, the base 1 includes a top cover plate (not shown), a bottom cover plate (not shown) and a side plate (not shown) to form an internal cavity 101. Two notches 102 are provided at the junction of the top cover plate and the side plate, and the notches 102 are connected to the internal cavity 101. The top cover plate, the bottom cover plate and the side plate can be formed in one piece, or connected by welding or threaded screws.

[0033] See also Figure 2 and Figure 3The placement rack 2 includes a top plate 201, a bottom plate 202, and two guide posts 203 arranged between the top plate 201 and the bottom plate 202. The bottom plate 202 is provided with two first mounting holes (not shown in the figure), and the bottoms of the two guide posts 203 are inserted into the two first mounting holes, so as to be fixed to the bottom plate 202 respectively. In addition, in order to further improve the stability of the installation of the two guide posts 203 on the bottom plate 202, a pad 207 can be added, and the pad 207 passes through the guide posts 203 and is fixedly connected to the bottom plate 202 by screws (not shown in the figure). Two second mounting holes (not shown in the figure) are provided on the top plate 201, and the upper ends of the two guide posts 203 pass through the two second mounting holes respectively, so as to be slidably arranged in the second mounting holes. In addition, the tops of the two guide posts 203 are located above the top plate 201 and are provided with mounting blocks 206 larger than the second mounting holes, which are used to limit the two guide posts 203 and prevent the two guide posts 203 from detaching from the top plate 201.

[0034] As an alternative implementation, see Figure 4 Magnets 208 are provided at the top ends of the two guide posts 203 and the top plate 201 , and the top plate 201 is fixed to the guide posts 203 via the magnets 208 .

[0035] In this embodiment, the top plate 201 is slidably mounted on the guide column 203, and the top plate 201 can move up and down along the guide column 203. In addition, in order to fix the top plate 201 when placing the battery cell 4, a magnet 208 can be set at the top of the guide column 203 and the position corresponding to the top plate 201. When the top plate 201 is pulled to the top, the magnets 208 between the two can be adsorbed together, and then the top plate 201 can be fixed on the guide column 203. After placing the battery cell 4, the top plate 201 can be pressed downward to overcome the adsorption force of the magnet 208 to make the top plate 201 detach from the guide column 203.

[0036] As an optional embodiment, the top plate 201 is provided with a plurality of buckle caps 204, and the bottom plate 202 is provided with a plurality of grooves 205 arranged at positions opposite to the buckle caps 204. In order to stably place the battery cell 4, a plurality of buckle caps 204 are integrally formed on the bottom surface of the top plate 201, and a plurality of grooves 205 corresponding to the buckle caps 204 are provided on the top surface of the bottom plate 202. When in use, the bottom of the battery cell 4 is accommodated in the groove 205, and the top is embedded in the buckle cap 204, and the diameter of the groove 205 and the buckle cap 204 is equal to that of the battery cell 4, thereby making the battery cell 4 stable between the top plate 201 and the bottom plate 202.

[0037] See also Figure 5 The pressurizing mechanism 3 comprises two pressurizing components, which are arranged on both sides of the placement rack (2) opposite to each other, and the two pressurizing components can move relative to each other.

[0038] Furthermore, the two pressurizing components include a driving member, a transmission member 301 and a pressurizing block 302. The driving member is connected to the transmission member, the transmission member 301 is connected to the pressurizing block 302, the driving member drives the transmission member 301 to rotate, and the transmission member 301 drives the pressurizing block 302 to apply lateral pressure to the battery cell 4 in the fixed position. After the power of the transmission member 301 is output, the two pressurizing blocks 302 can move relative to or away from each other. When moving relative to each other, the pressurizing block 302 can be pushed toward the battery cell 4, and when moving away from each other, the pressurizing block 302 can be withdrawn.

[0039] For further information, see Figure 5 and Figure 6 The above-mentioned driving member can be a cylinder 3015, or a motor, etc., which can be specifically configured according to the needs of the specific structure.

[0040] Furthermore, the transmission member 301 includes a gear 3011, two racks 3012, two connecting rods 3013 and a linear bearing 3014, wherein the gear 3011 and the two racks 3012 are meshed to form a rack pair, the connecting rod 3013 is connected to the ends of the racks 3012, the linear bearing 3014 is slidably connected to the connecting rod 3013, and the connecting rod 3013 is fixed to the pressure block 302.

[0041] In this embodiment, a gear 3011 arranged on the bottom surface of the chamber 101 is rotated by a bearing, and a pair of racks 3012 that move horizontally in opposite directions are meshed on the gear 3011, wherein one rack 3012 is fixed to the end of the piston rod of the cylinder 3015 through a connecting block 3016. During the extension of the piston rod of the cylinder 3015, the rack 3012 connected thereto and the other rack 3012 driven by the gear 3011 move relative to each other, and the two racks 3012 respectively pass through the base 1 through the corresponding notches 102. At the same time, a connecting rod 3013 is fixed to the outer end of the rack 3012, and the other end of the connecting rod 3013 is located directly above the base 1, and the other end of the connecting rod 3013 is fixed to the extrusion block 302 by a screw (not shown in the figure). Therefore, when the two racks 3012 move relative to each other, the two extrusion blocks 302 also move relative to each other accordingly, gradually approaching from the side of the battery cell 4.

[0042] In order to ensure the stability of the connecting rod 3013, a linear bearing 3014 is installed on the top surface of the base 1, and the connecting rod 3013 passes through the linear bearing 3014, so that the two form rolling friction, which on the one hand gives the connecting rod 3013 an upward supporting force; on the other hand, it can also reduce friction.

[0043] In this embodiment, the shape of the pressure block 302 can be set to a quadrangular pyramid shape, and the volume of the pressure block 302 gradually increases in the direction close to the fixed position. A plurality of pressure grooves 3021 are arranged on the sides of the two pressure blocks, and the pressure grooves 3021 are used to accommodate the battery cell 4 for lateral pressure. In addition, the shape of the pressure groove 3021 can be set selectively, and the shape of the pressure groove 3021 can be an arc groove or a square groove. When a pressure test is required for a circular battery cell, the pressure groove 3021 can be set to an arc groove, and the arc grooves of the two pressure blocks apply pressure to the outer circumference of the circular battery cell. Similarly, when a pressure test is required for a square battery cell, the pressure groove 3021 can be set to a square groove, and the square grooves of the two pressure blocks apply pressure to the outer surface of the square battery cell.

[0044] The specific working principle of the lateral pressure device for a battery cell provided by the utility model is as follows: the battery cell 4 to be tested is placed longitudinally between the top plate 201 and the bottom plate 202 of the placement rack 2, and then the cylinder 3015 is started to drive the rack 3012 connected thereto to move, and then the power is transmitted to the other rack 3012 through the gear 3011, so that the two racks 3012 move relative to each other, driving the two extrusion blocks 302 fixed by the connecting rod 3013 to move relative to each other, and the two extrusion blocks 302 squeeze from the side of the cylindrical battery cell 4 at the same time, and finally the response and stability of the cylindrical battery cell 4 when it is laterally pressurized are measured, thereby enriching the pressure test samples of the cylindrical battery cell 4 to more comprehensively determine the performance of the cylindrical battery cell 4.

[0045] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. They 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 cannot be understood as limitations on the present invention.

[0046] The above description is only an 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. A pressure-applying device for a battery cell, comprising a placement rack (2), wherein the placement rack (2) is provided with a fixed position for placing a battery cell (4), characterized in that: It also comprises a pressurizing mechanism, which comprises two pressurizing components. The two pressurizing components are arranged opposite to each other on two sides of the placement rack (2), and the two pressurizing components can move relative to each other.

2. The pressure-applying device for a battery cell as claimed in claim 1, characterized in that: The two pressurizing components are provided with a pressurizing portion, and the pressurizing portion has a plurality of pressurizing grooves (3021) arranged opposite to each other on its side. The pressurizing grooves (3021) are used to accommodate the battery core (4) for lateral pressure application.

3. The pressure-applying device for a battery cell as claimed in claim 1, characterized in that: The placement rack (2) comprises a top plate (201), a bottom plate (202), and guide columns (203) arranged between the top plate (201) and the bottom plate (202); the guide columns (203) are respectively fixed to the bottom plate (202); and the top plate (201) can be slidably arranged on the guide columns (203).

4. The pressure-applying device for a battery cell as claimed in claim 3, characterized in that: The top ends of the two guide posts (203) are provided with magnetic attracting members, and the top plate (201) is fixed to the guide posts (203) via the magnetic attracting members.

5. The pressure-applying device for a battery cell as claimed in claim 3, characterized in that: The top plate (201) is provided with a plurality of protrusions, and the bottom plate (202) is provided with a plurality of grooves (205) arranged at positions opposite to the protrusions.

6. The pressure-applying device for a battery cell as claimed in claim 2, characterized in that: The pressurizing component further includes a driving member and a transmission member (301), wherein the driving member is connected to the transmission member (301), and the transmission member (301) is connected to the pressurizing part. The driving member drives the transmission member (301) to rotate, and the transmission member (301) drives the pressurizing part to apply lateral pressure to the battery cell (4) at the fixed position.

7. The pressure-applying device for a battery cell as claimed in claim 6, characterized in that: The transmission member comprises a gear (3011), two racks (3012) and two connecting rods (3013); the gear (3011) and the two racks (3012) are meshed to form a rack pair; the connecting rod (3013) is connected to the ends of the racks (3012); and the connecting rod (3013) is fixed to the pressurizing part.

8. The pressure-applying device for a battery cell as claimed in claim 7, characterized in that: The transmission member further comprises a linear bearing (3014), and the linear bearing (3014) is slidably connected to the connecting rod (3013).

9. The pressure-applying device for a battery cell as claimed in claim 7, characterized in that: It also includes a base (1), the base (1) is provided with a chamber (101) for accommodating the driving member and the transmission member, the side of the base (1) is provided with an opening, and the rack (3012) connected to the connecting rod (3013) partially extends out of the opening.

10. The pressure-applying device for a battery cell as claimed in claim 2, characterized in that: The pressurizing portion is a pressurizing block (302) in the shape of a quadrangular pyramid, and the volume of the pressurizing block (302) gradually increases in a direction approaching the fixed position.

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