CN214043798U

CN214043798U - Battery with a battery cell

Info

Publication number: CN214043798U
Application number: CN202023044556.0U
Authority: CN
Inventors: 冯彪; 李桂平; 卜芳; ***; 刘金成
Original assignee: Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2021-08-24
Anticipated expiration: 2030-12-15

Abstract

The utility model discloses a battery, including drain pan, block and electric core, have in the drain pan and hold the chamber, be equipped with the opening on the drain pan, electric core is installed in holding the intracavity by the opening, and the shutoff opening is connected with the drain pan to the block, and electric core includes the first utmost point ear of being connected with the drain pan, and the drain pan includes the bottom plate and encloses the first leg of establishing on the bottom plate, and a side of first utmost point ear is supported tightly with the medial surface of first leg, and another side is supported tightly through inflation piece and electric core. Through setting up the inflation piece, can support first utmost point ear tightly at the medial surface of the first leg of drain pan, need not to weld first utmost point ear and also can guarantee that first utmost point ear and drain pan realize the electric conductance and lead to, the equipment degree of difficulty of battery has been reduced effectively, in addition, first utmost point ear is buckled between electric core and first leg, can not occupy the space of battery direction of height, the energy density of battery has been promoted effectively, and the pole piece contact of first utmost point ear and electric core has effectively been stopped and the short circuit takes place, the security of battery has been promoted.

Description

Battery with a battery cell

Technical Field

The utility model relates to a battery technology field especially relates to a battery convenient to equipment.

Background

With the development of technology, wearable terminal products show a great increase. The button cell is an important part in a wearable terminal product due to the characteristic of high energy density. However, the button cell has a small size and a precise structure, and thus, the assembly is difficult.

Generally, a button battery includes a metal bottom case, a cap, and a battery cell, where the battery cell is assembled in the metal bottom case, and the cap is connected to the metal bottom case in an insulating manner, so that the cap blocks an upper end opening of the metal bottom case, a positive tab of the battery cell is welded to the cap, a negative tab of the battery cell is welded to the metal bottom case, and the negative tab is welded to an inner bottom surface of the metal bottom case. The existing battery has the following defects: 1. the assembly mode of the tab occupies the space in the height direction of the battery, and is not beneficial to improving the energy density of the battery; 2. the pole piece of utmost point ear and electric core contacts easily, very easily leads to the short circuit, has great potential safety hazard.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an aim at: provided is a battery which has a simple structure, is easy to assemble, has a larger capacity with the same volume, and has a large energy density.

The embodiment of the utility model provides a another aim at: provided is a battery which is not easily short-circuited and has a high safety factor.

To achieve the purpose, the embodiment of the present invention adopts the following technical solutions:

the utility model provides a battery, includes drain pan, block and electric core, it holds the chamber to have in the drain pan, be equipped with the opening on the drain pan, electric core by the opening install in hold the intracavity, the block is connected to the block with the drain pan the opening, electric core include with first utmost point ear that the drain pan is connected, the drain pan includes the bottom plate and encloses to establish first leg on the bottom plate, a side of first utmost point ear with the medial surface of first leg supports tightly, another side through the inflation piece with electric core supports tightly.

As a preferable scheme of the battery, an adhesive layer is arranged on one side surface of the expansion piece close to the battery core, and the expansion piece is adhered to the battery core through the adhesive layer.

As a preferred aspect of the battery, the battery cell is a winding battery cell, and the expansion piece is adhered to a terminal end of the winding battery cell.

As a preferable scheme of the battery, one side of the expansion piece, which is close to the first tab, is provided with the adhesive layer, and the first tab is bonded with the expansion piece through the adhesive layer.

As a preferable scheme of the battery, a side surface of the expansion piece away from the battery core is provided with a rough surface, and the rough surface is abutted against the first tab.

As a preferable mode of the battery, the expansion member is a polystyrene sheet; and/or the presence of a gas in the gas,

the expansion piece is made of expansion glue, the side face, close to the first surrounding wall, of the battery cell is provided with a butt joint area for butting the first lug, the expansion glue is coated on the butt joint area, and the first lug is adhered to the battery cell through the expansion glue.

As a preferable scheme of the battery, the battery core is a winding battery core, the battery core is formed by winding a positive plate, a diaphragm and a negative plate after being laminated, and the positive plate and/or the negative plate are manufactured and formed by adopting an expansion pole piece.

As a preferable mode of the battery, the size of the expansion member is not smaller than that of the first tab, and the expansion member covers the first tab entirely.

As a preferred scheme of the battery, the battery cell includes a second tab, one of the first tab and the second tab is connected to the positive plate of the battery cell, the other of the first tab and the second tab is connected to the negative plate of the battery cell, and the second tab is welded to the inner side wall of the cap.

As a preferred scheme of battery, the block includes that roof and ring are established the second leg of a side of roof, the second leg cover is established outside the first leg, first leg with be provided with the sealing washer between the second leg, the inside wall of roof is provided with the metal anticorrosive coating, the metal anticorrosive coating can shelter from the roof is close to a side of bottom plate, the metal anticorrosive coating is kept away from a side of roof with the welding of second utmost point ear.

The utility model discloses beneficial effect does: through setting up the inflation piece, can support first utmost point ear tightly at the medial surface of the first leg of drain pan, need not to weld first utmost point ear and also can guarantee that first utmost point ear and drain pan realize the electric conductance and lead to, the equipment degree of difficulty of battery has been reduced effectively, in addition, first utmost point ear is buckled between electric core and first leg, can not occupy the space of battery direction of height, the energy density of battery has been promoted effectively, and the pole piece contact of first utmost point ear and electric core has effectively been stopped and the short circuit takes place, the security of battery has been promoted.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Fig. 1 is a schematic cross-sectional view of a battery according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a state after the battery cell and the expansion member are installed in the bottom case according to the embodiment of the present invention.

Fig. 3 is an enlarged schematic view of a portion a of fig. 1.

Fig. 4 is a schematic structural view of an expansion member according to an embodiment of the present invention.

Fig. 5 is a schematic structural view of an expansion member according to another embodiment of the present invention.

Fig. 6 is a schematic structural view of a cap according to another embodiment of the present invention.

In the figure:

1. a bottom case; 11. a base plate; 12. a first enclosure wall; 13. an accommodating chamber; 2. capping; 21. a top plate; 22. a second enclosure wall; 23. a metal corrosion protection layer; 24. a conductive adhesive layer; 3. an electric core; 31. a first tab; 32. a second tab; 33. a positive plate; 34. a negative plate; 35. a diaphragm; 4. an expansion member; 5. and (5) gluing the layers.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1 to 3, the battery of the embodiment of the utility model includes drain pan 1, block 2 and electric core 3, hold chamber 13 in the drain pan 1, be equipped with the opening on the drain pan 1, electric core 3 is installed in holding chamber 13 by the opening, block off opening is connected with drain pan 1 to block 2, electric core 3 includes the first utmost point ear 31 of being connected with drain pan 1, drain pan 1 includes bottom plate 11 and encloses first leg 12 of establishing on bottom plate 11, a side of first utmost point ear 31 supports tightly with the medial surface of first leg 12, another side supports tightly with electric core 3 through expansion piece 4. Through setting up inflation piece 4, can support first utmost point ear 31 tightly at the medial surface of the first leg 12 of drain pan 1, need not to weld first utmost point ear 31 and also can guarantee that first utmost point ear 31 and drain pan 1 realize the electric conductance and lead to, the equipment degree of difficulty of battery has been reduced effectively, in addition, first utmost point ear 31 is buckled between electric core 3 and first leg 12, can not occupy the space of battery direction of height, the energy density of battery has been promoted effectively, and the pole piece contact of first utmost point ear 31 and electric core 3 has effectively been stopped and the short circuit takes place, the security of battery has been promoted.

The battery of the embodiment can be a button battery, a cylindrical battery, a square battery or a battery of other chemical systems.

The battery cell 3 further includes a second tab 32, in this embodiment, the first tab 31 is a negative tab of the battery cell 3, the second tab 32 is a positive tab of the battery cell 3, and the second tab 32 is connected to the cap 2. Of course, the first tab 31 is not limited to be a negative tab, and the second tab 32 is a positive tab, but the first tab 31 may be a positive tab, and the second tab 32 may be a negative tab.

Electric core 3 is coiling type electric core 3, and coiling type electric core 3 is by positive plate 33, diaphragm 35 and negative pole piece 34 coiling shaping, and the outside of coiling type electric core 3 is diaphragm 35, also is provided with diaphragm 35 between positive plate 33 and the negative pole piece 34, and diaphragm 35 in the outside can prevent coiling type electric core 3 and drain pan 1 electrical contact.

In the present embodiment, as shown in fig. 4 (refer to fig. 1 to fig. 3), an adhesive layer 5 is disposed on one side surface of the expansion member 4 close to the winding type battery cell 3, and the expansion member 4 is adhered to the winding type battery cell 3 through the adhesive layer 5. Through setting up viscose layer 5, can fix in advance expansion piece 4, guarantee that expansion piece 4 can be connected as an organic whole with coiling type electricity core 3 after again with the assembly of drain pan 1, reduce the assembly degree of difficulty.

Preferably, the expansion piece 4 is stuck to the tail end of the winding type battery cell 3. At this moment, the expansion part 4 not only can serve as a tightening part for tightening the first tab 31, but also can serve as a tail-off adhesive tape of the winding type battery cell 3 to fix the winding type battery cell 3 after winding, and the tail-off adhesive tape does not need to be additionally arranged, so that the manufacturing cost is reduced, and the space inside the battery is saved.

In this embodiment, the expansion member 4 is a polystyrene sheet. The expansion member 4 is not limited to a polystyrene sheet, and may be any other material that can expand at a high temperature or expand when immersed in an electrolyte.

In an embodiment, as shown in fig. 5 (refer to fig. 1 to 3), an adhesive layer 5 is disposed on a side of the expansion member 4 close to the first tab 31, and the first tab 31 is bonded to the expansion member 4 through the adhesive layer 5. Through a side that is close to first utmost point ear 31 at inflation piece 4 sets up viscose layer 5, can fix first utmost point ear 31's position before the assembly of coiling formula electricity core 3, guarantee that first utmost point ear 31 can not take place the offset after the drain pan 1 is packed into in the assembling process or coiling formula electricity core 3, and then guarantee that first utmost point ear 31 can all laminate at the medial surface of the first leg 12 of drain pan 1 as far as, guarantee that first utmost point ear 31 and drain pan 1 realize good electric conductance.

When the expansion piece 4 is away from the side of the winding-type cell 3 and the adhesive layer 5 is not arranged, a rough surface is arranged on the side of the expansion piece 4 away from the winding-type cell 3, and the rough surface abuts against the first tab 31. Through setting up the rough surface, can reduce the probability of relative movement after first utmost point ear 31 and the laminating of expansion piece 4, guarantee that expansion piece 4 can be as much as possible with first utmost point ear 31 butt.

When the expansion piece 4 is close to the side of coiling formula electricity core 3 and does not set up viscose layer 5, can be in the expansion piece 4 and be close to a side of coiling formula electricity core 3 and set up the mat surface, this mat surface and coiling formula electricity core 3's lateral surface butt, this setting can prevent expansion piece 4 and coiling formula electricity core 3 laminating back relative movement, the probability of the relative movement after reducible first utmost point ear 31 and the laminating of expansion piece 4 in a certain extent, guarantee that expansion piece 4 can be as much as possible with first utmost point ear 31 butt.

In addition, if the two side surfaces of the expansion piece 4 are not provided with the adhesive layers 5, the two side surfaces of the expansion piece 4 can be provided with rough surfaces, so that the friction force of the expansion piece 4 contacting with the winding type battery core 3 is increased, and the friction force of the expansion piece 4 contacting with the first tab 31 is also increased.

In an embodiment, the expansion element 4 is not limited to a sheet structure or a structure with an adhesive layer 5 in the sheet structure, and the expansion element 4 may also be directly provided as an expansion glue, the side of the wound electrical core 3 close to the first surrounding wall 12 has an abutting region abutting against the first tab 31, the expansion glue is coated on the abutting region, and the first tab 31 is adhered to the wound electrical core 3 through the expansion glue.

In order to ensure that all positions of the first tab 31 can be tightly abutted, the contact area with the inner side surface of the first peripheral wall 12 of the bottom case 1 is increased, the size of the expansion piece 4 is not smaller than that of the first tab 31, and the expansion piece 4 fully covers the first tab 31.

In one embodiment, the positive electrode sheet 33 and/or the negative electrode sheet 34 of the winding type battery cell 3 are manufactured and molded by using an expansion electrode sheet. Any one of the positive plate 33 and the negative plate 34 of the winding type battery cell 3 is set as an expansion pole piece, so that the winding type battery cell 3 can have certain expansion after being assembled or injected with liquid, and then the auxiliary expansion piece 4 completely abuts against the first tab 31 on the first surrounding wall 12.

In this embodiment, the negative electrode sheet 34 includes a negative electrode current collector and a negative electrode material disposed on the negative electrode current collector, where the negative electrode material may be an active substance formed by mixing a carbon material such as graphite, a mesophase microsphere, carbon fiber, and a carbon nanotube with a binder (CMC), a conductive agent or other additives, and a solvent, or an active substance formed by mixing a silicon-based material such as silicon carbon and silicon oxygen with a binder, a conductive agent or other additives, and a solvent, or an active substance formed by an alloy-based negative electrode material and a corresponding additive. The active material is transferred onto the negative electrode current collector by coating, printing, or other means, and dried, rolled, slit, and tabletted to form the negative electrode sheet 34. The negative electrode sheet 34 preparation process may be some of the above processes, and is not limited to the above processes.

In this embodiment, the positive electrode sheet 33 includes a positive electrode current collector and a positive electrode material disposed on the positive electrode current collector, and the positive electrode material is an active material composed of a main material and an additive, such as lithium cobaltate, an NCM ternary material, and lithium iron phosphate. The pole piece prepared by the preparation process similar to that of the negative electrode can also be prepared from other materials which expand after being heated and soaked in electrolyte. The conditions for expansion include, but are not limited to, the above conditions.

In an embodiment, as shown in fig. 6 (refer to fig. 1), the cap 2 includes a top plate 21 and a second surrounding wall 22 surrounding a side surface of the top plate 21, the second surrounding wall 22 is sleeved outside the first surrounding wall 12, a sealing ring (not shown in the figure) is disposed between the first surrounding wall 12 and the second surrounding wall 22, an inner side wall of the top plate 21 is provided with a metal corrosion-resistant layer 23, the metal corrosion-resistant layer 23 can shield a side surface of the top plate 21 close to the bottom plate 11, a side surface of the metal corrosion-resistant layer 23 away from the top plate 21 is welded to the second tab 32, and the second tab 32 is a positive tab. Through set up a metal anticorrosive coating 23 at the inside wall of roof 21 to make metal anticorrosive coating 23 and second utmost point ear 32 welding, can utilize metal anticorrosive coating 23 to keep apart lid 2 and second utmost point ear 32, effectively prevent that second utmost point ear 32 and lid 2 from being corroded and weeping or scrapping.

The metal corrosion prevention layer 23 is connected with the inner side wall of the top plate 21 through a conductive adhesive layer 24. Utilize conductive adhesive layer 24 to bond metal anticorrosive coating 23 through the inside wall at roof 21, conductive adhesive layer 24 can electric intercommunication metal anticorrosive coating 23 and roof 21 to sticky mode operation degree of difficulty is low, can effectively reduce manufacturing cost, in addition, conductive adhesive layer 24 can also the inside wall of shutoff roof 21 with clearance between the metal anticorrosive coating 23 stops electrolyte completely and enters into between the inside wall of metal anticorrosive coating 23 and roof 21.

In a specific embodiment of the present invention, the assembly process of the battery is as follows:

step S100, laminating and winding the positive plate 33, the negative plate 34 and the diaphragm 35 to form a winding type battery cell 3;

step S200, sticking an expansion piece 4 on the side surface of the winding type battery cell 3;

step 300, folding the first tab 31 and attaching the first tab to the side surface of the winding type battery cell 3, and attaching one side surface of the first tab 31 to the expansion piece 4;

step S400, assembling the assembly consisting of the winding type battery cell 3 and the expansion piece 4 into the accommodating cavity 13 of the bottom shell 1;

step S500, welding the second lug 32 with the inner side wall of the top plate 21 of the cap 2;

step S600, injecting electrolyte into the bottom shell 1, assembling the cover cap 2 on the bottom shell 1, and then performing the procedures of formation, capacity division and the like to complete the battery assembly.

During the completion of step S600, the expansion element 4 expands to press the first tab 31 against the inner side wall of the first wall 12.

In other embodiments, not only the electric core 3 is set as the winding-type electric core 3, but also the laminated-type electric core 3 is set, and the expansion piece 4 can be attached to a side surface of the laminated-type electric core 3 corresponding to the first surrounding wall 12, and can also reach the purpose of abutting against the first tab 31.

In the description herein, it is to be understood that the terms "upper" and the like are used in a descriptive sense and based on the orientation or positional relationship shown in the drawings for convenience in description and simplicity of operation, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, configuration and operation in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description herein, references to the description of "an embodiment" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.

Claims

1. The utility model provides a battery, includes drain pan, block and electric core, it holds the chamber to have in the drain pan, be equipped with the opening on the drain pan, electric core by the opening install in hold the intracavity, the block with the shutoff is connected to the drain pan the opening, a serial communication port, electric core include with the first utmost point ear that the drain pan is connected, the drain pan includes the bottom plate and encloses to be established first leg on the bottom plate, a side of first utmost point ear with the medial surface of first leg supports tightly, another side through the inflation piece with electric core supports tightly.

2. The battery of claim 1, wherein an adhesive layer is disposed on a side of the swelling member close to the battery cell, and the swelling member is adhered to the battery cell through the adhesive layer.

3. The battery of claim 2, wherein the cell is a coiled cell, and the swelling member is adhered to a terminal end of the coiled cell.

4. The battery of claim 2, wherein the side of the expansion member adjacent to the first tab is provided with the adhesive layer, and the first tab is bonded to the expansion member through the adhesive layer.

5. The battery of claim 2, wherein a side of the expansion member remote from the cell is provided with a roughened surface, and the roughened surface abuts against the first tab.

6. The battery of claim 1, wherein the expansion member is a polystyrene sheet; and/or the presence of a gas in the gas,

7. The battery according to claim 1, wherein the cell is a winding cell, the cell is formed by winding a positive plate, a diaphragm and a negative plate after being laminated, and the positive plate and/or the negative plate are manufactured and formed by adopting an expansion pole piece.

8. The battery according to any one of claims 1 to 7, wherein the size of the expansion member is not smaller than that of the first tab, and the expansion member entirely covers the first tab.

9. The battery of any one of claims 1 to 7, wherein the battery cell comprises a second tab, one of the first tab and the second tab is connected to a positive plate of the battery cell, the other of the first tab and the second tab is connected to a negative plate of the battery cell, and the second tab is welded to an inner side wall of the cap.

10. The battery according to claim 9, wherein the cap comprises a top plate and a second wall surrounding a side surface of the top plate, the second wall is sleeved outside the first wall, a sealing ring is arranged between the first wall and the second wall, a metal corrosion-resistant layer is arranged on an inner side wall of the top plate, the metal corrosion-resistant layer can shield a side surface of the top plate close to the bottom plate, and a side surface of the metal corrosion-resistant layer far away from the top plate is welded to the second tab.