CN219677527U - Battery cell - Google Patents

Abstract

The utility model provides a battery, which comprises a shell, a top cover assembly and a battery cell assembly, wherein the top cover assembly and the shell cover are combined and enclosed to form a containing cavity; the first housing cover has a liquid injection hole through which the battery is configured to inject an electrolyte into the accommodating chamber; the first cap is equipped with first boss, and first boss encircles annotates the liquid hole interval setting, and first boss is constructed to guide electrolyte to avoid electrolyte to block up annotates the liquid hole, guarantee annotating the unobstructed of liquid hole, improve the production efficiency of battery.

Description

Battery cell

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery.

Background

Under the requirements of energy conservation, emission reduction and sustainable development, the demand of new energy technology is increasing, and the power battery is widely applied to various electric equipment, including consumer electronic products, new energy automobiles, unmanned aerial vehicles, electric tools, energy storage equipment and the like. The battery has different sizes and structures according to different application scenes.

In the related art, the power battery has the characteristics of high energy density, long cycle life, no memory effect, environmental friendliness and the like, and is widely applied to plug-in hybrid electric vehicles, hybrid electric vehicles and pure electric vehicles. The power battery generally comprises a shell and an electric core, wherein the electric core is arranged in the shell, the shell is provided with a cover plate, the electric core is convenient to put in during assembly, and the cover plate is provided with a liquid injection hole for injecting electrolyte into the shell.

However, in the current manufacturing process of the battery, when the electrolyte is injected into the electrolyte injection hole, the electrolyte injection hole is easy to be blocked, so that the electrolyte cannot be injected.

Disclosure of Invention

In view of the above problems, the embodiment of the utility model provides a battery, which can prevent a liquid injection hole from being blocked in a mailbox, ensure smooth injection of electrolyte and improve production efficiency.

In order to achieve the above object, the present utility model provides a battery, which includes a case, a top cover assembly and a battery cell assembly, wherein the top cover assembly and the case cover are combined and enclosed to form a containing cavity, and the battery cell assembly is located in the containing cavity.

The top cover assembly comprises a first shell cover and a second shell cover, and the second shell cover is arranged on one side of the first shell cover, which is away from the battery cell assembly; the first housing cover has a liquid injection hole through which the battery is configured to inject an electrolyte into the accommodating chamber; the first cap is provided with first bosses disposed around the liquid injection hole at intervals, the first bosses being configured to guide the electrolyte.

According to the battery provided by the embodiment of the utility model, the first boss is arranged on the periphery of the liquid injection hole, and the first boss is used for forming the diversion space on the periphery of the liquid injection hole, so that the effect of guiding the flow of electrolyte is achieved when the electrolyte is injected, the electrolyte is prevented from blocking the liquid injection hole, the smoothness of the liquid injection hole is ensured, and the production efficiency of the battery is improved.

As an alternative embodiment, the first boss is located on a side of the first cover facing the receiving chamber.

The arrangement is such that the first boss can be raised relative to the bottom side of the first housing cover in the direction of injection of the electrolyte, and plays a guiding role for the electrolyte.

As an alternative embodiment, the first boss may include a plurality of protrusions spaced around the liquid injection hole, and a distance between adjacent protrusions may be 0.01mm to 3mm.

By the arrangement, a complete diversion space can be formed in Zhou Cecheng of the liquid injection hole, and the smoothness of the circulation of the electrolyte is improved.

As an alternative embodiment, the extension shape of the boss may be a straight line; alternatively, the extension shape of the boss may be an arc.

By the arrangement, the distribution of the protruding parts can be set according to the shape and the size of the liquid injection hole, and the layout rationality of the protruding parts is improved.

As an alternative embodiment, the second cover may be provided with a through hole, and the through hole is opposite to and communicated with the liquid injection hole; the periphery side of the through hole can be provided with a second boss, and the second boss faces the liquid injection hole.

By the arrangement, when electrolyte is injected into the through hole of the second shell cover, the inner side of the second boss can play a role in guiding the electrolyte, so that the smoothness of the circulation of the electrolyte is improved.

As an alternative embodiment, the second boss may extend at least partially into the liquid injection hole.

So set up, the second boss can lead to the electrolyte of annotating the liquid hole, avoids annotating the liquid hole jam.

As an alternative embodiment, the top cap assembly may further include a pole having a connection plate and a connection plate to which the connection plate may be connected; the first shell cover is provided with a mounting hole, and the pole can be penetrated through the mounting hole.

The arrangement is that the terminal is connected with the terminal outside the top cover component at the same time of the terminal being electrically connected with the battery cell component.

As an alternative implementation mode, the height of the surface of the first boss, which faces the side of the battery cell assembly, relative to the first shell cover is H1, the height of the surface of the second boss, which faces the side of the battery cell assembly, relative to the second shell cover is H2, the thickness of the first shell cover is T1, the thickness of the connecting plate is T2, and the thickness of the connecting plate is T3, wherein H2-T1 is less than or equal to H1 and less than or equal to T2+T3+3mm.

By the arrangement, the heights of the first boss and the second boss can be controlled in a reasonable range, and the influence on the energy density of the battery is avoided.

As an alternative embodiment, the top cover assembly may further include a terminal, an insulating member, and a sealing ring, the post being connected to the terminal, the insulating member being connected to the second cover, the insulating member being located between the terminal and the second cover; the sealing ring is sleeved on the outer side of the pole.

So set up, when terminal and utmost point post have good electricity connectivity, guarantee that terminal and second cap have good insulating properties, avoid producing the influence to battery performance.

As an alternative embodiment, the battery may further include an explosion-proof valve, which may be provided to the case; or the explosion-proof valve is arranged on the second shell cover.

As an alternative embodiment, the top cover assembly may further include an insulating sheet disposed on a side of the second cover facing away from the first cover, the insulating sheet being provided with an opening opposite to the liquid injection hole.

So set up, guarantee that top cap subassembly top of battery has good insulating properties.

The utility model provides a battery, which comprises a shell, a top cover assembly and a battery cell assembly, wherein the top cover assembly and the shell cover are combined and enclosed to form a containing cavity; the first housing cover has a liquid injection hole through which the battery is configured to inject an electrolyte into the accommodating chamber; the first cap is equipped with first boss, and first boss encircles annotates the liquid hole interval setting, and first boss is constructed to guide electrolyte to avoid electrolyte to block up annotates the liquid hole, guarantee annotating the unobstructed of liquid hole, improve the production efficiency of battery.

In addition to the technical problems, features constituting the technical solutions, and advantageous effects caused by the technical features of the technical solutions described above, other technical problems that the battery provided by the present utility model can solve, other technical features included in the technical solutions, and advantageous effects caused by the technical features, further detailed description will be made in the detailed description of the present utility model.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is an exploded view of a battery according to an embodiment of the present utility model;

fig. 2 is a schematic view showing a bottom structure of a top cap assembly in a battery according to an embodiment of the present utility model;

fig. 3 is a schematic structural diagram of a first cover in a battery according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram II of a first cover in the battery according to the embodiment of the present utility model;

fig. 5 is an exploded view of a cap assembly in a battery according to an embodiment of the present utility model;

fig. 6 is a cross-sectional view of a cap assembly in a battery according to an embodiment of the present utility model.

Reference numerals illustrate:

100-a housing; 110-an outer film;

200-a top cover assembly; 210-a first housing cover; 211-a liquid injection hole; 212-a first boss; 220-a second cover; 221-a second boss; 230-pole; 231-connecting plates; 240-connecting pieces; 250-terminal; 260-insulating member; 270-sealing ring; 280-insulating sheets;

300-cell assembly; 310-insulating layer.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The demand of new energy technology is increasing, and power batteries are widely applied to various electric equipment, including consumer electronic products, new energy automobiles, unmanned aerial vehicles, electric tools, energy storage devices and the like. The power battery has the characteristics of high energy density, long cycle life, no memory effect, environmental friendliness and the like, and is widely applied to plug-in hybrid electric vehicles, hybrid electric vehicles and pure electric vehicles. The battery has different sizes and structures according to the difference of application scenes, and the power battery generally comprises a shell and an electric core, wherein the electric core is arranged in the shell, the shell is provided with a cover plate, the electric core is convenient to put in during assembly, and the cover plate is provided with a liquid injection hole for injecting electrolyte into the shell.

However, at present, in the manufacturing process of the battery, when electrolyte is injected into the electrolyte injection hole, the electrolyte injection hole is easy to block, so that the electrolyte cannot be injected, the production efficiency is affected, the battery can be scrapped even, and the yield of battery production is reduced.

The utility model provides a battery, wherein a protruding structure is arranged at the outer side of a liquid injection hole of the battery, and a space for guiding electrolyte to flow is formed at the outer side of the liquid injection hole by utilizing the protruding structure, so that the smoothness of the flow during electrolyte injection is improved, the blocking of the liquid injection hole is avoided, the electrolyte injection efficiency is improved, the production time is saved, and the battery productivity is improved.

The battery according to the embodiment of the present utility model is described below with reference to the accompanying drawings. It should be noted that, the battery provided in the embodiment of the present utility model may be a secondary battery, that is, the battery in the embodiment of the present utility model may be charged and discharged and recycled, and specific types of the battery may include, but are not limited to, lithium batteries, etc., and the battery may be used in a scenario including, but not limited to, electronic products, energy storage devices, vehicles, etc., such as mobile communication devices, new energy vehicles, unmanned aerial vehicles, etc., and the embodiment of the present utility model is not limited thereto.

Fig. 1 is an exploded view of a battery according to an embodiment of the present utility model, fig. 2 is a schematic view of a bottom structure of a top cap assembly in a battery according to an embodiment of the present utility model, fig. 3 is a schematic view of a first cover in a battery according to an embodiment of the present utility model, fig. 4 is a schematic view of a second cover in a battery according to an embodiment of the present utility model, fig. 5 is an exploded view of a top cap assembly in a battery according to an embodiment of the present utility model, and fig. 6 is a cross-sectional view of a top cap assembly in a battery according to an embodiment of the present utility model.

Referring to fig. 1 to 6, a battery according to an embodiment of the utility model includes a housing 100, a top cover assembly 200 and a battery cell assembly 300, wherein the top cover assembly 200 and the housing 100 are covered and enclosed to form a receiving cavity, and the battery cell assembly 300 is disposed in the receiving cavity. Electrolyte can be injected into the accommodating cavity, and the top cover assembly 200 can be in sealing connection with the shell 100, so that the accommodating cavity is a closed space, and the electrolyte is prevented from leaking.

The top cover assembly 200 includes a first cover 210 and a second cover 220, the second cover 220 is disposed on a side of the first cover 210 facing away from the battery cell assembly 300, the first cover 210 has a liquid injection hole 211, the liquid injection hole 211 is communicated with an inner space of the accommodating cavity, in a manufacturing process of the battery, the battery is configured to inject electrolyte into the accommodating cavity through the liquid injection hole 211, and after the liquid injection is completed, the liquid injection hole 211 can be sealed through a sealing member.

It will be appreciated that the top of the case 100 is provided with an opening, the cap assembly 200 is provided at the top of the case 100 and covers the case 100, and after the cap assembly 200 is assembled with the case 100, an electrolyte is injected, and when the electrolyte is injected, the electrolyte is injected into the receiving chamber from above the cap assembly 200 downward.

In some embodiments, the first housing cover 210 is provided with first bosses 212, the first bosses 212 are spaced around the liquid injection hole 211, the first bosses 212 are configured to guide the electrolyte, when the electrolyte flows through the liquid injection hole 211, the first bosses 212 may form a space through which the electrolyte flows, and an inner sidewall of the first bosses 212 facing the liquid injection hole 211 may guide the electrolyte to flow.

In the battery provided by the embodiment of the utility model, the first boss 212 is arranged on the periphery of the liquid injection hole 211, the first boss 212 is utilized to form a diversion space on the periphery of the liquid injection hole 211, the first boss 212 is distributed on the periphery of the liquid injection hole 211, the formed space can be a non-closed space, namely, a gap can be reserved in a peripheral part area, and the effect of guiding the electrolyte to flow is achieved when the electrolyte is injected, so that the electrolyte is prevented from blocking the liquid injection hole 211, the smoothness of the liquid injection hole 211 is ensured, and the production efficiency of the battery is improved.

The specific structure of the first boss 212 will be described in detail first.

Referring to fig. 1 to 6, in one possible implementation, the first boss 212 may be located at a side of the first housing cover 210 facing the accommodating cavity, so that the first boss 212 may protrude in the injection direction of the electrolyte with respect to the bottom side of the first housing cover 210, and may serve as a guide for the electrolyte.

It will be appreciated that when the battery is vertically placed and the top cap assembly 200 is disposed above the case 100, the first boss 212 is positioned at the lower surface of the first cap 210, and when electrolyte is injected, the electrolyte flows in from the side of the injection hole 211 facing away from the first boss 212, so that the side provided with the first boss 212 flows out, and when the electrolyte flows out, the first boss 212 improves the space for the outflow of the electrolyte and guides the flow of the electrolyte.

In some embodiments, the first boss 212 may include a plurality of protruding portions, where the protruding portions are disposed around the liquid injection hole 211 at intervals, so that a complete flow guiding space is formed in the Zhou Cecheng of the liquid injection hole 211, and the smoothness of the flowing electrolyte is improved.

It will be appreciated that the adjacent protrusions may have a gap therebetween, and the first protrusions 212 distributed around the circumference of the liquid injection hole 211 may have one or more gaps depending on the number of protrusions. The number of the specific protrusions may be two, three or more, and the embodiment of the present utility model does not specifically limit the number of the specific protrusions, that is, the spacing distance between the adjacent protrusions.

Illustratively, the spacing between adjacent bosses may be 0.01mm-3mm, including but not limited to 0.01mm, 0.02mm, 1mm, 2mm, 2.9mm, 3mm, etc., as embodiments of the present utility model are not specifically limited thereto.

It should be noted that, the extension shape of the protruding portion may be a straight line, or the extension shape of the protruding portion may be an arc line, and the distribution of the protruding portion may be set according to the shape and the size of the liquid injection hole 211, so as to improve the layout rationality of the protruding portion.

In addition, the liquid injection hole 211 may be in a circular hole shape, or the liquid injection hole 211 may be in other shapes, including but not limited to a square hole, an elliptical hole, or a hole with other cross-sectional shapes, and the cross-sectional size of the liquid injection hole 211 may be set according to the type, size, and production process of the battery, which is not particularly limited in the embodiment of the present utility model.

In some embodiments, the shape of the protruding portion may be one or more of a "one" shape, an "eight" shape, an "i" shape, a "T" shape, a "U" shape, a "well" shape, etc., and the first boss 212 formed by surrounding the protruding portions may be formed by combining protruding portions of the same or different shapes.

For example, as shown in fig. 2, the protrusions may be arc-shaped, two protrusion combinations may form an "eight" shape, and four protrusion combinations may form a "well" shape. For example, as shown in fig. 3 and 4, the protrusions may be linear, four protrusions may be combined to form a "mouth" shape, and three protrusions may be combined to form a triangle shape. The first bosses 212 of different shapes, numbers and combinations may have other shapes and structures, which will not be described herein.

It should be noted that, the first casing cover 210 is made of an insulating material, for example, the first casing cover 210 may be made of plastic or a plastic material, the second casing cover 220 is located outside the first casing cover 210, so as to play a role in protection, the second casing cover 220 may be made of a metal or alloy material such as aluminum, for example, the second casing cover 220 may be made of a smooth aluminum sheet, which is beneficial to the weight reduction of the battery. The electrolyte needs to pass through the second housing cover 220, and the second housing cover 220 may be provided with a corresponding drainage structure through the liquid injection hole 211 of the first housing cover 210, which will be described in detail below.

Referring to fig. 1 to 6, in one possible implementation manner, the second housing cover 220 may be provided with a through hole, where the through hole may be opposite to the liquid injection hole 211, and the through hole is in communication with the liquid injection hole 211, so that the electrolyte may be injected into the liquid injection hole 211 through the through hole, and a second boss 221 may be disposed on a peripheral side of the through hole, where the second boss 221 faces the liquid injection hole 211.

It is understood that the inside of the second boss 221 may serve as a guide for the electrolyte when the electrolyte is injected through the through hole of the second case cover 220, improving the smoothness of the electrolyte flow. In addition, the second boss 221 may act as a barrier to the electrolyte, preventing the electrolyte from overflowing to other positions of the cap assembly 200 during the injection process, affecting the performance of the battery.

In some embodiments, at least a portion of the second boss 221 may extend into the liquid injection hole 211, and the second boss 221 may guide the electrolyte flowing through the liquid injection hole 211, so as to better prevent the liquid injection hole 211 from being blocked. The depth dimension value of the second boss 221 inserted into the liquid injection hole 211 is not particularly limited in the embodiment of the present utility model.

The second boss 221 is in an annular structure, and the second boss 221 may be surrounded to form a closed area, so as to ensure that electrolyte entering from the through hole can flow into the electrolyte injection hole 211 and then be injected into the accommodating cavity through the electrolyte injection hole 211.

In one possible implementation, the cap assembly 200 may further include a post 230 and a connection piece 240, the post 230 having a connection plate 231, the connection piece 240 being connectable with the connection plate 231; the first housing cover 210 has a mounting hole through which the pole 230 can be inserted, so that the pole 230 can be connected with the terminal 250 at the outer side of the cap assembly 200 while the pole 230 is electrically connected with the battery cell assembly 300.

The dimensional relationships of the first boss 212 and the second boss 221 with respect to the other components of the cap assembly 200 are described in detail below.

In some embodiments, the height of the surface of the first boss 212 facing the side of the cell assembly 300 with respect to the first housing cover 210 is H1, the height of the surface of the second boss 221 facing the side of the cell assembly 300 with respect to the second housing cover 220 is H2, the thickness of the first housing cover 210 is T1, the thickness of the connecting plate 231 is T2, and the thickness of the connecting plate 240 is T3, wherein H2-T1 < h1+.t2+t3+3mm, so that the heights of the first boss 212 and the second boss 221 can be controlled within a reasonable range to avoid influencing the energy density of the battery.

It can be appreciated that the height of the first protruding strip may be greater than the difference between the height of the second protruding strip 221 and the thickness of the first casing cover 210, that is, when the second casing cover 220 is disposed above the first casing cover 210 in a fitting manner, the second protruding strip 221 extends into the liquid injection hole 211 from the inflow end of the electrolyte, and the end surface of the second protruding strip 221 does not exceed the liquid outlet end of the liquid injection hole 211.

In addition, the height of the first boss 212 may be smaller than the sum of the thicknesses of the connection plate 231 and the connection piece 240, and a certain size space is left, that is, the vertical distance between the lower surface of the connection piece 240 and the end surface of the first boss 212 is 3mm or more, including but not limited to 3mm, 3.5mm, 4mm, 5mm, etc., which is not particularly limited in the embodiment of the present utility model.

In some embodiments, the top cover assembly 200 may further include a terminal 250, an insulating member 260 and a sealing ring 270, where the terminal 230 is connected to the terminal 250, the insulating member 260 may be connected to the second housing cover 220, the insulating member 260 is located between the terminal 250 and the second housing cover 220, the sealing ring 270 is sleeved on the outer side of the terminal 230, and the terminal 250 and the terminal 230 have good electrical connection performance, and meanwhile, it may be ensured that the terminal 250 and the second housing cover 220 have good insulation performance, so as to avoid affecting the battery performance.

In addition, the top cap assembly 200 may further include an insulating sheet 280, where the insulating sheet 280 is disposed on a side of the second cap 220 facing away from the first cap 210, and the insulating sheet 280 is provided with an opening opposite to the liquid injection hole 211, so as to ensure that the top cap assembly 200 of the battery has good insulating performance.

In some embodiments, the battery may further include an explosion-proof valve, which may be provided to the housing 100; alternatively, the explosion-proof valve is provided to the second cover 220. When the pressure in the battery exceeds a threshold value, the explosion-proof valve can be opened under the action of the pressure in the battery to release the pressure of the battery, so that the safety of the battery during operation is ensured.

It should be noted that the post 230 may include a positive post and a negative post, and the terminal 250, the insulating member 260, the sealing ring 270, and the connecting piece 240 may be disposed in pairs, and correspond to the positive post and the negative post, respectively, and are assembled in the same or similar manner, which is not described herein.

In the battery of the embodiment of the utility model, the casing 100 may be an aluminum casing, the inner side of the aluminum casing is provided with the battery cell assembly 300, the outer side of the battery cell assembly 300 may be wrapped with the insulating layer 310, and the insulating layer 310 may be a polyester polymer film, so as to play a good insulating role. The outer side of the case 100 may be provided with an outer wrapping film 110 to protect the case 100 from scratch or damage of the case 100.

The following is an exemplary description of the battery manufacturing process.

Step one: and the anode and cathode ingredients comprise anode active substances, conductive agents, binders, solvents and the like, and the cathode ingredients comprise cathode active substances, binders, thickeners, solvents and the like, and are uniformly mixed by a high-speed stirrer respectively.

Step two: and (3) coating the anode and the cathode, coating the slurry of the anode and the cathode ingredients on a current collector through coating equipment, and drying through a drying oven.

Step three: the positive electrode and the negative electrode are rolled and cut, the coated pole piece is cut into small strips after being rolled, and then the small strips are cut into the required size of a coiled core or a laminated core by a laser die cutting machine.

Step four: the winding or lamination is manufactured into a winding core or a lamination core through a winding device or a lamination device according to the cell design structure.

Step five: packaging, namely placing the winding core or the stacked core into the stretched shell 100, adding the top cover assembly 200 for sealing, and reserving the liquid injection hole 211.

Step six: baking, and placing into baking equipment.

Step seven: and (3) injecting liquid, vacuumizing the baked battery, and injecting electrolyte, wherein the environmental dew point is less than or equal to minus 31 ℃.

Step eight: forming, negative pressure forming, and secondary liquid supplementing after forming is completed;

step nine: sorting, namely sorting out the unqualified batteries with voltage and capacity through a charge and discharge test.

After testing the product of the technical scheme of the battery in the embodiment of the utility model, the test result is illustrated.

Sample one: the first boss 212 on the first cover 210 is a combination of two 'eight' shapes, and the height of the first boss 212 is 2mm.

Sample two: the first boss 212 on the first cover 210 is a combination of two 'eight' shapes, and the height of the first boss 212 is 3mm.

Sample three: the first boss 212 on the first cover 210 is a combination of two 'eight' shapes, and the height of the first boss 212 is 4mm.

Sample four: the first boss 212 on the first cover 210 is a combination of three 'straight' shapes, and the height of the first boss 212 is 2mm.

Sample five: the first boss 212 on the first cover 210 is a combination of three 'straight' shapes, and the height of the first boss 212 is 3mm.

Sample six: the first boss 212 on the first cover 210 is a combination of three 'straight' shapes, and the height of the first boss 212 is 4mm.

The test criterion is the liquid injection efficiency per minute, and compared with the battery structure without the first boss 212, the liquid injection efficiency of the battery can be obviously improved by the sample.

In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be fixedly connected, or indirectly connected through intermediaries, for example, or may be in communication with each other between two elements or in an interaction relationship between the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein.

Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. The battery is characterized by comprising a shell, a top cover assembly and a battery cell assembly, wherein the top cover assembly and the shell cover are combined and enclosed to form a containing cavity, and the battery cell assembly is positioned in the containing cavity;

the top cover assembly comprises a first shell cover and a second shell cover, and the second shell cover is arranged on one side, away from the battery cell assembly, of the first shell cover; the first shell cover is provided with a liquid injection hole; the first shell cover is provided with first bosses, and the first bosses are arranged around the liquid injection holes at intervals.

2. The battery of claim 1, wherein the first boss is located on a side of the first housing cover facing the receiving cavity.

3. The battery of claim 1, wherein the first boss comprises a plurality of bosses, and a spacing between adjacent bosses is 0.01mm-3mm.

4. The battery according to claim 3, wherein the extension shape of the protruding portion is a straight line; alternatively, the extension shape of the protruding portion is an arc.

5. The battery according to any one of claims 1 to 4, wherein the second case cover is provided with a through hole which is opposed to and communicates with the liquid injection hole; the periphery of the through hole is provided with a second boss, and the second boss faces the liquid injection hole.

6. The battery of claim 5, wherein the second boss extends at least partially into the pour hole.

7. The battery of claim 5, wherein the top cap assembly further comprises a post having a connecting plate and a connecting tab connected to the connecting plate; the first shell cover is provided with a mounting hole, and the pole is arranged in the mounting hole in a penetrating mode.

8. The battery of claim 7, wherein the first boss has a height H1 relative to a surface of the first housing cover facing the side of the cell assembly, the second boss has a height H2 relative to a surface of the second housing cover facing the side of the cell assembly, the first housing cover has a thickness T1, the connecting plate has a thickness T2, and the connecting plate has a thickness T3, wherein H2-T1 < h1 is equal to or less than t2+t3+3mm.

9. The battery of claim 7, wherein the top cap assembly further comprises a terminal, an insulator, and a seal ring, the post is connected to the terminal, the insulator is connected to the second housing cover, and the insulator is located between the terminal and the second housing cover; the sealing ring is sleeved on the outer side of the pole.

10. The battery of any one of claims 1-4, further comprising an explosion-proof valve disposed in the housing; or the explosion-proof valve is arranged on the second shell cover.