CN215184424U

CN215184424U - Battery structure

Info

Publication number: CN215184424U
Application number: CN202120463971.5U
Authority: CN
Inventors: 不公告发明人
Original assignee: Shanghai Cenat New Energy Co Ltd
Current assignee: Shanghai Cenat New Energy Co Ltd
Priority date: 2021-03-03
Filing date: 2021-03-03
Publication date: 2021-12-14
Anticipated expiration: 2031-03-03

Abstract

The utility model provides a battery structure, include battery case and locate battery case's battery core, still be equipped with the water conservancy diversion curb plate in the battery case, the water conservancy diversion curb plate clamp is located the side of battery core with between battery case's the inner wall, the length direction of water conservancy diversion curb plate sets up along annotating the liquid direction, just set up the guiding gutter that sets up along its length direction on the water conservancy diversion curb plate, make electrolyte pass through the guiding gutter flows to adjacent in the battery core. The utility model provides a battery structure, setting up of guiding gutter makes electrolyte can infiltrate the pole piece along guiding gutter fast flow to pole piece at length direction's middle part, can reduce the time that the pole piece was infiltrated, improves the efficiency of annotating the liquid, also can effectively avoid the emergence of separating out the lithium phenomenon.

Description

Battery structure

Technical Field

The utility model belongs to the technical field of the battery, more specifically say, relate to a battery structure.

Background

With the continuous development of the battery industry, the application of the battery is more and more extensive, and the battery is applied to the fields of mobile phones, computers, electric vehicles and the like. With the improvement of the requirement of the industry on the energy density of the battery, the battery adopting the 'knife-shaped' battery with the length-height ratio of more than 10 becomes a novel battery structure more and more. However, in the electrolyte injection process, the electrolyte can only be gradually infiltrated along the length direction of the battery core, when the length of the battery core is too long, and when a battery core assembly with a small assembly gap (i.e. an assembly of the positive and negative electrode plates and the isolating membrane) is used for injecting the electrolyte, the electrolyte injection time is too long due to the excessively small assembly gap, and meanwhile, the electrolyte infiltration difficulty in the middle of the electrode plates is high, so that the lithium precipitation phenomenon is easily caused.

Disclosure of Invention

An object of the embodiment of the utility model is to provide a battery structure to solve the notes liquid efficiency that exists among the prior art and cross the technical problem who hangs down, the pole piece middle part is difficult to the infiltration.

In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides a battery structure, includes battery case and locates battery case's battery core still includes the water conservancy diversion curb plate, the water conservancy diversion curb plate clamp is located the side of battery core with between battery case's the inner wall, the length direction of water conservancy diversion curb plate sets up along annotating the liquid direction, just set up the guiding gutter that sets up along its length direction on the water conservancy diversion curb plate, make electrolyte pass through the guiding gutter flows to adjacent in the battery core.

In the above scheme, the diversion side plate is arranged on the side surface of the battery core, and the diversion side plate is provided with the diversion trench arranged along the length direction of the diversion side plate. The arrangement of the diversion trench enables the electrolyte to rapidly flow to the middle of the pole piece in the length direction along the diversion trench, so that the pole piece in the battery core is soaked, the soaking time of the pole piece can be reduced, the liquid injection efficiency is improved, and the occurrence of a lithium separation phenomenon can be effectively avoided.

In one embodiment, the number of the flow guide side plates is two, and the flow guide side plates are respectively arranged on two sides of the battery core.

By adopting the scheme, the two side faces of the battery core are provided with the flow guide side plates, flow guide can be carried out on the pole piece gaps of the two side faces of the battery core, the infiltration speed of the electrolyte in the length direction of the battery core can be increased, the infiltration efficiency of the electrolyte in the width direction of the battery core can also be increased, and therefore the problem that one side of the battery core is not infiltrated in place can be prevented.

In one embodiment, the battery structure further includes a strapping tape for strapping the battery cell and the flow guide side plate.

In the above scheme, the strapping tape is used for strapping the pole pieces and the flow guide side plates, the strapping tape has corrosion resistance, and the electrolyte cannot corrode the strapping tape.

In one embodiment, the battery housing includes a main case having an opening, and a top bracket covering the opening, the battery cell is disposed in the main case, and the flow guide side plate is hermetically connected to the top bracket.

In the above scheme, the main shell is provided with an opening, the battery core can be placed in the main shell through the opening, and the top support is arranged at the opening of the main shell to shield and seal the opening. The flow guide side plate is connected with the top support, so that the top support can be conveniently installed.

In one embodiment, a through hole is formed in one end of the flow guide side plate close to the opening, and the through hole extends from the end of the flow guide side plate close to the opening to an end wall of the flow guide groove, so that the through hole and the flow guide groove are communicated with each other.

In the above scheme, the through hole and the flow guide groove are communicated with each other, when liquid is injected, electrolyte flows to the flow guide side plate, the electrolyte directly flows to the flow guide groove through the through hole and gradually flows to the middle of the pole piece along the length direction of the flow guide groove, so that part of the electrolyte is continuously infiltrated from the middle of the pole piece along the width direction of the pole piece, and the middle position of the pole piece is infiltrated as fast as possible. And the end of the diversion side plate close to the opening is closed, so that the battery core is not easily scratched by the end of the diversion side plate in the process of being placed into the main shell.

In one embodiment, the top bracket is provided with a liquid injection hole, and the liquid injection hole is opposite to the through hole.

In the scheme, the liquid injection hole is opposite to the through hole, so that the electrolyte can directly enter the through hole from the liquid injection hole and then enter the liquid guide groove, the liquid injection path is shortened as much as possible, and the liquid injection pressure is reduced.

In one embodiment, the diversion trench penetrates through one end of the diversion side plate close to the opening.

In the above scheme, the guiding gutter runs through being close to opening one end of water conservancy diversion curb plate, makes being close to opening one end of water conservancy diversion curb plate be the forked type, and electrolyte is entering battery case inside back through annotating the liquid hole, can directly flow to the guiding gutter in, further accelerates to annotate liquid speed, reduces and annotates liquid pressure.

In one embodiment, a clamping groove is formed at one end of the flow guide side plate close to the opening, and a clamping pin fastened with the clamping groove is arranged at one end of the top bracket close to the flow guide side plate; alternatively, the first and second electrodes may be,

a clamping groove is formed in one end, close to the flow guide side plate, of the top support, and a clamping pin fastened with the clamping groove is arranged at one end, close to the opening, of the flow guide side plate.

In the above scheme, water conservancy diversion curb plate and top support buckle are connected for water conservancy diversion curb plate and top support change in dismantling and installing.

In one embodiment, the top bracket is provided with an avoiding hole for the pole lug of the battery core to pass through.

In the above scheme, the top support is arranged at one end of the battery core and used for sealing the battery core in the main shell, and the arrangement of the avoiding holes enables the positive pole lug or the negative pole lug to penetrate through the top support, so that the top support and the main shell are conveniently and hermetically mounted, and the pole lugs can be exposed.

In one embodiment, on the same flow guide side plate, the number of the flow guide grooves is multiple, and the multiple flow guide grooves are sequentially arranged along the thickness direction of the battery cell.

In the above scheme, a plurality of guiding gutters are arranged in sequence along the laminating direction of the pole pieces, and when the battery core is injected with liquid, electrolyte can be divided into a plurality of strands to enter into each guiding gutter respectively, so that the plurality of strands of electrolyte can permeate between the corresponding pole pieces simultaneously in the height direction of the battery core, and the infiltration efficiency of the electrolyte can be further improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a three-dimensional structure diagram (without a main case) of a battery structure provided by an embodiment of the present invention;

fig. 2 is an exploded view of a battery structure according to an embodiment of the present invention;

fig. 3 is a partial detail view of a in fig. 2.

Wherein, in the figures, the respective reference numerals:

1-a battery cell; 11-a tab; 2-a flow guide side plate; 21-a diversion trench; 22-a through hole; 23-a card slot; 3-strapping tape; 4-a battery case; 41-main shell; 42-a top support; 420-avoiding holes; 421-bayonet.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

The battery structure provided by the embodiment of the present invention is now explained.

In one embodiment of the present invention, referring to fig. 1 and fig. 2, the battery structure includes a battery case 4 and a battery cell 1, and the battery cell 1 is disposed inside the battery case 4 to protect the battery cell 1. The battery core 1 comprises a positive plate, a negative plate and a diaphragm, wherein the positive plate and the negative plate are respectively provided with a tab 11, the tabs 11 of the adjacent positive plate and the negative plate can be arranged towards two opposite directions, and thus, after the positive plate, the diaphragm and the negative plate are combined into the battery core 1, the two ends of the battery core 1 are respectively provided with a positive tab and a negative tab. The negative electrode sheet, the separator, and the positive electrode sheet may be laminated or wound to form the battery cell 1, and the specific structure of the battery cell is not limited herein. Electrolyte needs to be fully soaked between the adjacent positive and negative pole pieces, the energy density of the battery core 1 is ensured, and the phenomenon of lithium precipitation can be prevented. The inside of the battery case 4 is provided with a flow guide side plate 2, and more specifically, the flow guide side plate 2 is disposed between the battery case 4 and the side of the battery cell 1. The side surface of the battery cell 1 refers to one side of the battery cell 1 in the length direction, and further, the length of the battery cell 1 is greater than the width of the battery cell 1, the width of the battery cell 1 is greater than the height (thickness) of the battery cell 1, and here, the side surface of the battery cell 1 refers to a plane where the length direction of the battery cell 1 and the height direction of the battery cell 1 are located at the same time. The diversion side plate 2 is provided with a diversion trench 21, and the length direction of the diversion trench 21 is arranged along the length direction of the battery core 1. When injecting liquid to the battery, electrolyte flows to water conservancy diversion curb plate 2 after, flows gradually along the length direction of guiding gutter 21 on water conservancy diversion curb plate 2 for the velocity of flow of electrolyte on the length direction of battery core 1, and electrolyte can flow to the middle part of pole piece in length direction rapidly, then gets into between the adjacent pole piece through the gap between the piece, soaks each positive, negative pole piece. Therefore, the infiltration efficiency of the electrolyte can be greatly accelerated.

The battery structure in the above embodiment includes a battery case 4, a battery core 1 and a diversion side plate 2, the diversion side plate 2 is disposed on a side surface of the battery core 1, and a diversion trench 21 disposed along a length direction of the diversion side plate 2 is disposed on the diversion side plate 2. The arrangement of the guide groove 21 enables the electrolyte to rapidly flow to the middle position of the pole piece in the length direction along the guide groove 21, so that the pole piece is soaked, the soaking time of the pole piece can be reduced, the liquid injection efficiency is improved, and the occurrence of a lithium separation phenomenon can be effectively avoided.

In one embodiment of the present invention, referring to fig. 2, the number of the diversion side plates 2 is two, and the two diversion side plates are respectively disposed on two opposite sides of the battery cell 1, so that the two sides of the battery cell 1 are both provided with the diversion side plates 2, and the pole piece gaps on the two sides of the battery cell 1 can be both diverted. Therefore, the infiltration speed of the electrolyte in the length direction of the battery core 1 can be increased, and the infiltration efficiency of the electrolyte in the width direction of the battery core 1 can also be increased, so that the phenomenon that one side of the battery core 1 is not infiltrated in place can be prevented.

In one embodiment of the present invention, referring to fig. 2, the battery structure further includes a binding band 3, and the binding band 3 is used for binding the pole piece and the flow guiding side plate 2. The battery cell 1 is a laminate in which a plurality of positive electrode sheets, a plurality of separators, and a plurality of negative electrode sheets are laminated, and the electrode sheets need to be bound with the binding tape 3 even if the flow guide side plate 2 is not provided, and therefore, the flow guide side plate 2 does not need to be provided with an additional binding tape 3. The binding tape 3 has corrosion resistance, and the electrolyte does not corrode the binding tape 3. The binding band 3 may be in the form of a ring, and binds the stacked body and the guide side plate 2 together in a rubber band manner. In other embodiments, the strapping tape 3 may also be in a strip shape, one end of the strapping tape 3 is adhered to the top surface of the battery core 1 and then extends to the surface of the flow guide side plate 2, and the other end is adhered to the bottom surface of the battery core 1. In this embodiment, when the number of the guide side plates 2 is one, the number of the binding tapes 3 is at least one; when the number of the diversion side plates 2 is two, the number of the strapping tapes 3 is at least two; i.e. at least one strapping 3 secures one of the guide side plates 2.

In one embodiment of the present invention, please refer to fig. 2, the battery housing 4 includes a main casing 41 and a top bracket 42, the main casing 41 has an opening, the battery cell 1 can be placed inside the main casing 41 through the opening, and the top bracket 42 is disposed at the opening of the main casing 41 to shield and seal the opening. The diversion side plate 2 is hermetically connected with the top bracket 42, so that the top bracket 42 is convenient to install, and liquid leakage from the connection part of the diversion side plate 2 and the top bracket 42 can be prevented. In other embodiments, the top bracket 42 may be directly fixed to the main housing 41 to press the deflector skirt 2 against the inside of the main housing 41. It should be noted that, when the number of the top brackets 42 is two, the two ends of the main casing 41 in the length direction are both provided with openings, and each opening is provided with one top bracket 42, so that the liquid can be injected from the two ends of the main casing 41.

In one embodiment of the present invention, please refer to fig. 3, one end of the diversion side plate 2 close to the opening is not penetrated by the diversion trench 21, the through hole 22 is formed in the end of the diversion side plate 2 close to the opening, the through hole 22 extends from the end of the diversion side plate 2 close to the opening to the side wall of the diversion trench 21, i.e. one end of the through hole 22 penetrates through the end of the diversion side plate 2 close to the opening, and the other end penetrates through the side wall of one end of the diversion trench 21, so that the through hole 22 is communicated with the diversion trench 21. Therefore, when the electrolyte is injected, the electrolyte flows to the flow guide side plate 2, directly flows to the flow guide groove 21 through the through hole 22, and gradually flows to the middle part of the pole piece along the length direction of the flow guide groove 21, so that part of the electrolyte is continuously infiltrated from the middle part of the pole piece along the width direction of the pole piece, and the middle part of the pole piece is infiltrated as fast as possible. The shape of the through hole 22 is not limited herein, and the cross section thereof may be square, circular, or the like, and may communicate with the guide groove 21. Because the one end that the water conservancy diversion curb plate 2 is close to the open-ended is not run through by guiding gutter 21, like this, the one end that is close to the open-ended of water conservancy diversion curb plate 2 is the closed form, when battery structure assembles, at first installs water conservancy diversion curb plate 2 to the main casing 41 of battery housing 4 in, then places battery core 1 in main casing 41, and the one end that is close to the open-ended of water conservancy diversion curb plate 2 is the closed form, puts into the in-process of main casing 41 at battery core 1, is difficult to be scratched by the tip of water conservancy diversion curb plate 2. And the end part of the diversion side plate 2 is provided with a through hole 22, thereby solving the problem that the electrolyte enters the diversion trench 21.

Optionally, a liquid injection hole is formed in the top bracket 42, and the liquid injection hole is opposite to the through hole 22, so that the electrolyte can directly enter the through hole 22 from the liquid injection hole and then enter the liquid guide tank, the liquid injection path is shortened as much as possible, and the liquid injection pressure is reduced. When the number of the flow guide side plates 2 is two, the number of the liquid injection holes is also two, and the liquid injection holes are arranged opposite to the through holes 22 one by one.

Alternatively, the number of the top brackets 42 is two, and the top brackets are respectively disposed at opposite sides of the battery cell 1. Like this, can annotate the liquid from the both ends of battery core 1 respectively, electrolyte as long as flow to battery core 1 in length direction's middle part can, greatly reduced annotates the liquid degree of difficulty.

In other embodiments, the diversion trench 21 penetrates through the end, close to the opening, of the diversion side plate 2, so that the end, close to the opening, of the diversion side plate 2 is in a forked type, and after electrolyte enters the interior of the battery shell 4 through the electrolyte injection hole, the electrolyte can directly flow into the diversion trench 21, so that the electrolyte injection speed is further increased, and the electrolyte injection pressure is reduced.

Optionally, one end of the flow guide side plate 2, which is far away from the opening, may be penetrated by the flow guide side plate 2, or may be closed. Specifically, when both ends of the diversion side plate 2 are penetrated by the diversion trench 21, the diversion side plate 2 is divided into two side plate units, and when one end of the diversion side plate 2 is penetrated by the diversion trench 21 and the other end of the diversion side plate 2 is closed, the diversion side plate 2 is U-shaped.

In one embodiment of the present invention, please refer to fig. 3, the diversion side plate 2 and the top bracket 42 are connected by a snap-fit, so that the diversion side plate 2 and the top bracket 42 are easier to detach and install. The clamping groove 23 is formed in one end, close to the opening, of the flow guide side plate 2, the clamping pin 421 is arranged at one end, close to the flow guide side plate 2, of the top support 42, and when the flow guide side plate 2 and the top support 42 are assembled, the clamping pin 421 of the top support 42 extends into the clamping groove 23 of the flow guide side plate 2, and the flow guide side plate 2 and the top support 42 are connected in a clamping mode. Or, the clamping groove 23 is formed in one end, close to the flow guide side plate 2, of the top bracket 42, the clamping pin 421 is arranged at one end, close to the opening, of the flow guide side plate 2, and when the flow guide side plate 2 and the top bracket 42 are assembled, the clamping pin 421 of the flow guide side plate 2 extends into the clamping groove 23 of the top bracket 42, so that the flow guide side plate 2 and the top bracket 42 are connected in a clamping mode.

In other embodiments, the diversion side plate 2 and the top bracket 42 may also be connected by screws, pins, rivets, etc., and the connection manner of the diversion side plate 2 and the top bracket 42 is not limited herein.

In one embodiment of the present invention, please refer to fig. 2, the top bracket 42 is provided with a avoiding hole 420, the two ends of the battery core 1 are respectively formed with a positive electrode tab and a negative electrode tab, the top bracket 42 is disposed at one end or the opposite ends of the battery core 1, and is used for sealing the battery core 1 in the main casing 41, the arrangement of the avoiding hole 420 enables the positive electrode tab 11 or the negative electrode tab 11 to pass through the top bracket 42, the top bracket 42 and the main casing 41 are conveniently sealed and installed, and the electrode tab 11 can be exposed.

Optionally, on the same flow guide side plate 2, the number of the flow guide grooves 21 is multiple, and the multiple flow guide grooves 21 are sequentially arranged along the thickness direction of the battery cell 1. Like this, especially when the pole piece is range upon range of and is set up, and annotate liquid to battery core 1, electrolyte can divide into the stranded and enter into each guiding gutter 21 respectively for in the thickness direction of battery core 1, the infiltration of stranded electrolyte simultaneously between to the pole piece that corresponds, thereby can further improve the infiltration efficiency of electrolyte.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a battery structure, includes battery shell and locates battery core in the battery shell which characterized in that: the battery case is characterized by further comprising a diversion side plate, wherein the diversion side plate is clamped between the side face of the battery core and the inner wall of the battery case, the length direction of the diversion side plate is arranged along the liquid injection direction, a diversion trench arranged along the length direction of the diversion side plate is formed in the diversion side plate, and electrolyte flows into the battery core through the diversion trench.

2. The battery structure of claim 1, wherein: the number of the flow guide side plates is two, and the flow guide side plates are respectively arranged on two sides of the battery core.

3. The battery structure of claim 1, wherein: the battery structure further includes a strapping tape for strapping the battery cell and the flow guide side plate.

4. The battery structure of claim 1, wherein: the battery shell comprises a main shell with an opening and a top support arranged at the opening in a covering mode, the battery core is arranged in the main shell, and the flow guide side plate is connected with the top support in a sealing mode.

5. The battery structure of claim 4, wherein: one end of the flow guide side plate, which is close to the opening, is provided with a through hole, and the through hole extends to the end wall of the flow guide groove from one end of the flow guide side plate, which is close to the opening, so that the through hole is communicated with the flow guide groove.

6. The battery structure of claim 5, wherein: and the top bracket is provided with a liquid injection hole, and the liquid injection hole is opposite to the through hole.

7. The battery structure of claim 4, wherein: the diversion trench penetrates through one end, close to the opening, of the diversion side plate.

8. The battery structure of claim 4, wherein: a clamping groove is formed in one end, close to the opening, of the flow guide side plate, and a clamping pin fastened with the clamping groove is arranged at one end, close to the flow guide side plate, of the top support; alternatively, the first and second electrodes may be,

9. The battery structure of claim 4, wherein: the top support is provided with a avoiding hole for the pole lug of the battery core to pass through.

10. The battery structure of any of claims 1-9, wherein: on the same water conservancy diversion curb plate, the quantity of guiding gutter is a plurality of, and is a plurality of the guiding gutter is arranged in proper order along the thickness direction of battery core.