CN219534586U - Battery cell - Google Patents

Abstract

The present utility model provides a battery comprising: the battery pack comprises a shell, a cover plate, a battery cell and at least one insulating pressing piece, wherein a containing cavity is formed in the shell, the cover plate is connected with the shell, the cover plate resists the opening end of the containing cavity, the battery cell is arranged in the containing cavity, the battery cell comprises pole pieces and a diaphragm which are arranged in a stacked mode or in a stacked mode and wound mode, and the diaphragm extends out of the pole pieces at least one end of the diaphragm in a first direction by a distance L, wherein L is more than or equal to 0.1mm and less than or equal to 15mm; the insulating compaction piece comprises a base body part and a protruding part connected to the base body part, wherein the base body part is connected to one surface of the cover plate, which faces the battery cell, the protruding part protrudes towards the direction away from the base body part, and the protruding part extrudes the battery cell, so that the compressed amount of the battery cell along the first direction is S, and S is more than or equal to 0.2mm and less than or equal to 2 xL. The utility model is used for at least solving the technical problem that the battery core is easy to shake.

Description

Battery cell

Technical Field

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

Background

In recent years, a new energy technology is paid attention to, and a 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 the fields of hybrid electric vehicles, pure electric vehicles, agricultural unmanned aerial vehicles, electric tools and the like.

The battery in the related art generally comprises a shell and a cover plate provided with an electric terminal, wherein the shell and the cover plate are enclosed to form a closed accommodating cavity, a battery cell and electrolyte are arranged in the accommodating cavity, however, the stability of the battery cell fixed in the accommodating cavity is poor, the battery cell is easy to shake in the production and working processes of the battery, and the battery cell and the shell are pulled or even separated, so that the service life of the battery is influenced.

Disclosure of Invention

The utility model provides a battery which is used for at least solving the technical problem that a battery core is easy to shake.

In order to achieve the above object, the present utility model provides a battery comprising:

the shell is internally provided with an accommodating cavity;

the cover plate is connected with the shell and resists the opening end of the accommodating cavity;

the battery cell is arranged in the accommodating cavity and comprises pole pieces and a diaphragm which are arranged in a stacked mode or in a stacked mode and wound mode, and the distance of the diaphragm extending out of the pole pieces at least one end of the diaphragm in the first direction is L, wherein L is more than or equal to 0.1mm and less than or equal to 15mm;

the insulation pressing piece comprises a base body part and a protruding part connected to the base body part, the base body part is connected to one surface of the cover plate, which faces the battery cell, the protruding part protrudes towards the direction away from the base body part, and the protruding part extrudes the battery cell, so that the compressed amount of the battery cell along the first direction is S, and S is more than or equal to 0.2mm and less than or equal to 2 xL.

According to the battery provided by the utility model, the electric core is extruded through the protruding part of the insulating pressing piece, the electric core is pressed to prevent the electric core from shaking, so that the problems of tab breakage and the like caused by shaking of the electric core are avoided, and the use safety of the battery is improved.

In one possible implementation manner, at least two protruding portions are arranged at intervals along the second direction, one surface of the battery cell facing the insulating pressing piece is connected with a tab, and the tab extends between two adjacent protruding portions;

and along the second direction, the distance between two adjacent protruding parts is larger than the width of the tab.

In one possible implementation manner, a plurality of through holes are formed in the protruding portion, and the projection area of the through holes is 0.05-0.2 times of the projection area of the protruding portion along the thickness direction of the cover plate;

and/or the height of the protruding part is 3 mm-10 mm.

In one possible implementation manner, the base body part is further provided with an avoidance hole, one surface of the cover plate facing the battery cell is provided with an information identification area, and the avoidance hole corresponds to the position of the information identification area.

In one possible embodiment, the edge of the relief hole is provided with a reinforcing rib, which protrudes from the side of the base body facing the battery cell.

In one possible embodiment, the side of the base body facing the battery cell has an explosion-proof vent, and the height of the explosion-proof vent protruding from the side of the base body facing the battery cell is 0.1mm to 10mm.

In one possible implementation manner, the explosion-proof exhaust part is internally provided with an exhaust hole;

and the projection area of the exhaust hole is 0.1-0.5 times of the projection area of the explosion-proof exhaust part along the thickness direction of the cover plate.

In one possible embodiment, the insulating pressing part has a distance H1 from the inner side wall of the housing, wherein 0.5 mm.ltoreq.H2.ltoreq.5 mm.

In one possible implementation manner, a mounting hole is further formed in the base body, a pole column electrically connected with the pole lug penetrates through the mounting hole, and a boss is arranged at the edge of the mounting hole.

In one possible embodiment, the insulating pressing members are two insulating pressing members arranged side by side along the second direction, and a space is provided between the two insulating pressing members.

In one possible implementation, the compression of the cells is 0.2mm to 5mm.

According to the battery provided by the utility model, the through holes are formed in the protruding part, so that the effect of passing electrolyte is achieved, the electrolyte is prevented from remaining between the cover plate and the insulating pressing piece, the battery capacity is increased, and in addition, the effect of weight reduction is achieved.

According to the battery provided by the utility model, the at least two protruding parts are mutually arranged at intervals along the second direction, so that the deflection of the battery core caused by single-side extrusion of the battery core is avoided, the stress of the battery core is uniform, and the use stability of the battery is improved.

According to the battery provided by the utility model, the distance between two adjacent protruding parts is larger than the width of the lug along the second direction, so that the protruding parts can avoid the lug, interference is prevented when the protruding parts are abutted against the battery core, and the lug is prevented from being damaged.

In addition to the technical problems, technical features constituting the technical solutions, and beneficial effects caused by the technical features of the technical solutions described above, other technical problems that can be solved by a battery provided by the embodiment of the present utility model, other technical features included in the technical solutions, and beneficial effects caused by the technical features of the technical solutions are described in detail in the detailed description.

Drawings

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

Fig. 1 is a schematic diagram of an explosion structure of a battery according to an embodiment of the present utility model;

fig. 2 is a schematic view of a partial structure of a battery according to an embodiment of the present utility model;

fig. 3 is a schematic structural view of an insulating pressing member of a battery according to an embodiment of the present utility model;

fig. 4 is a schematic structural view of another insulating pressing member of the battery according to the embodiment of the present utility model;

fig. 5 is a schematic structural view of another insulating pressing member of the battery according to the embodiment of the present utility model;

fig. 6 is a schematic structural diagram of a separator and pole piece arrangement of a battery according to an embodiment of the present utility model.

Reference numerals illustrate:

10-a housing;

11-a receiving cavity;

20-cover plate;

21-explosion-proof valve;

22-a liquid injection hole;

30-an electric core;

31-electrode lugs;

32-a membrane;

33-pole pieces;

331-a first pole piece;

332-a second pole piece;

40-insulating compaction;

41-a base portion;

411-avoidance holes;

412-reinforcing bars;

413-mounting holes;

414-boss;

415-a liquid inlet channel;

42-a boss;

421-via;

43-explosion-proof exhaust section;

431-vent;

50-pole.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. 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.

In the use process of the battery, especially when the battery is used under the vibration working condition, the battery core is easy to shake in the shell, the tab is easy to be pulled and stressed, the tab is easy to break, and potential safety hazards exist.

Therefore, according to the battery provided by the embodiment of the utility model, the battery core is compressed by the protruding part of the insulating pressing piece, so that the battery core is prevented from shaking, the problems of tab breakage and the like caused by shaking of the battery core are avoided, and the use stability of the battery is improved.

The battery provided by the embodiment of the utility model is described below with reference to the drawings.

Referring to fig. 1 and 2, a battery according to an embodiment of the present utility model includes: the battery pack comprises a shell 10, a cover plate 20, a battery cell 30 and at least one insulating pressing piece 40, wherein an accommodating cavity 11 is formed in the shell 10; the cover plate 20 is connected with the shell 10, and the cover plate 20 is resisted at the opening end of the accommodating cavity 11; the battery cell 30 is arranged in the accommodating cavity 11, and referring to fig. 6, the battery cell 30 comprises a pole piece 33 and a diaphragm 32 which are arranged in a stacked or stacked and wound manner, and the diaphragm 32 extends out of the pole piece 33 at least one end along the first direction by a distance L, wherein L is more than or equal to 0.1mm and less than or equal to 15mm; referring to fig. 2 and 3, the insulating pressing member 40 includes a base portion 41 and a protrusion portion 42 connected to the base portion 41, the base portion 41 is connected to a surface of the cover 20 facing the battery cell 30, the protrusion portion 42 protrudes in a direction away from the base portion 41, and the protrusion portion 42 presses the battery cell 30 so that the battery cell 30 is compressed in a first direction by S, wherein S is 0.2mm < 2×l.

According to the battery provided by the utility model, the raised part 42 of the insulating pressing piece 40 is abutted against the battery cell 30, the raised part 42 presses the battery cell 30, and the battery cell 30 is pressed to prevent the battery cell 30 from shaking, so that the problems of tab breakage and the like caused by shaking of the battery cell 30 are avoided, and the use safety of the battery is improved.

The first direction refers to the direction indicated by arrow Z in fig. 1, i.e., the height direction of the battery cell 30.

The insulating pressing member 40 is made of insulating material, which may be plastic, or may be made of other insulating materials, so as to achieve an insulating effect and prevent the battery cell 30 from directly contacting the cover plate 20 to cause a short circuit. Of course, the insulating pressing member 40 elastically presses the battery cell 30, so that the problem of damaging the battery cell 30 due to the rigid contact of the insulating pressing member 40 with the battery cell 30 can be avoided.

In one possible implementation, referring to fig. 4, the base portion 41 and the boss 42 are integrally connected as a unitary structure, which is advantageous for improving the structural strength of the insulating compression member 40.

In one possible embodiment, the protruding portion 42 and the base portion 41 may also be separate components, for example, the protruding portion 42 may be assembled and connected to the base portion 41 by means of a paste or snap connection.

In one possible implementation, referring to fig. 2 and 3, the side of the base portion 41 connected to the cover plate 20 may be planar, which facilitates better fitting of the insulating pressing member 40 to the cover plate 20, and saves internal space of the battery.

In one possible implementation, the shape of the boss 42 may be, but is not limited to, a rectangular boss, an oval boss, or other shape.

In one possible implementation, the surface of the protruding portion 42 facing the battery cell 30 may be a plane, or may be a plurality of ribs or bumps, so as to improve the extrusion effect on the battery cell 30.

In one possible embodiment, referring to fig. 6, in general, the battery cell 30 is formed by winding or stacking a pole piece 33 and a separator 32, the pole piece 33 includes a plurality of first pole pieces 331 and a plurality of second pole pieces 332 spaced apart from each other and stacked, the first pole pieces 331 and the second pole pieces 332 are separated by the separator 32, and in order to secure insulation between the first pole pieces 331 and the second pole pieces 332, the width of the separator 32 is greater than the width of the first pole pieces 331 and the width of the second pole pieces 332, and thus, the separator 32 protrudes outside the first pole pieces 331 and the second pole pieces 332.

In one possible embodiment, after the first pole piece 331, the second pole piece 332, and the separator 32 are wound, the separator 32 protrudes from the first pole piece 331 or the second pole piece 332 by a distance L of 0.1 mm+.l+.15 mm in at least one end in the first direction, i.e., the top position and the bottom position of the cell 30.

In one possible implementation, the distance L by which the diaphragm 32 extends beyond the first pole piece 331 or the second pole piece 332 may be 0.1mm, 1mm, 2.5mm, 10mm, or 15mm.

Considering that the material of the separator 32 is relatively soft, for example, polypropylene (PP) or Polyethylene (PE) is used, after the battery cell is assembled to the housing 10, the separator 32 is pressed down by the protrusion 42 through the compression of the battery cell 30, so that the overall height of the battery cell 30 is reduced, and the battery cell 30 is compressed, thereby being beneficial to improving the energy density of the battery. It will be readily appreciated that the first pole piece 331 and the second pole piece 332 are not compressed when the boss 42 compresses the cell 30.

In one possible implementation, the boss 42 is used to compress the cell 30 such that the cell 30 is compressed, either by the diaphragm 32 being positioned at the top of the cell 30 in the first direction or by the diaphragm 32 being positioned at the bottom of the cell 30 in the first direction, or by the diaphragms 32 being positioned at both ends of the cell 30 in the first direction.

In one possible implementation, the protrusion 42 presses the battery cell 30 such that the compressed amount S by which the battery cell 30 is compressed in the first direction is less than 2×l, so that the pole piece 33 may be protected from being pressed, and S may be 0.2mm to 5.5mm. For example, the compression S of the cell 30 may be 0.2mm, 1mm, 2mm, 3mm or 5mm. But in order to ensure that the insulating pressing member 40 presses the battery cell 30 while not damaging the battery cell 30, the compression amount S is 5mm or 5.5mm.

In one possible implementation, the housing 10 may be cubic or may have other shapes, which are not particularly limited herein.

In one possible implementation, the housing 10 and the cover 20 are made of metal materials, such as aluminum, and have conductivity, so that contact between the battery cell 30 and the cover 20 can be prevented by reasonable action of the insulating pressing member 40, thereby having a good insulating effect.

In one possible embodiment, as shown in fig. 2 and 3, at least two protrusions 42 are arranged at intervals along the second direction, and a tab 31 is connected to a side of the battery cell 30 facing the insulating pressing member 40, and the tab 31 extends between two adjacent protrusions 42. With such a structure, the protrusion 42 can avoid the tab 31, and prevent interference when the protrusion abuts against the battery cell 30, thereby avoiding damage to the tab 31. Wherein the second direction is with reference to the direction indicated by arrow X in fig. 3.

In one possible implementation, as shown with reference to fig. 1 and 3, the cells 30 may be one or two or more side-by-side. Each cell 30 is connected with two lugs 31, and the two lugs 31 are mutually spaced along the second direction. In order to improve the effective extrusion effect of the insulating pressing member 40 on the battery cell 30 and the balance of the stress of the battery cell 30, there may be three protruding portions 42, where two protruding portions 42 respectively press against two ends of the battery cell 30 along the second direction, and one protruding portion 42 presses against between two tabs 31 arranged at intervals along the second direction. The battery cell 30 deflection caused by single-side extrusion of the battery cell 30 is avoided, so that the stress of the battery cell 30 is uniform, and the use stability of the battery is improved.

In one possible implementation, the spacing between two adjacent protrusions 42 is greater than the width of the tab 31 in the second direction, where the width of the tab 31 is the total width of the overlapping single-pole tabs, and after the battery is assembled, it is ensured that the protrusions 42 do not damage the tab 31.

In one possible implementation, when the battery cells 30 are two or more disposed side by side, the spacing between two adjacent protrusions 42 is greater than the sum of the width of the tab 31 and the offset width of the tab 31 in the second direction.

In one possible embodiment, referring to fig. 3 and 4, a plurality of through holes 421 are formed in the boss 42, and a projected area of the through holes 421 is 0.05 to 0.2 times a projected area of the boss 42 in a thickness direction of the cover plate 20. In the battery, the through-holes 421 function to pass the electrolyte, preventing the electrolyte from remaining between the cap plate 20 and the insulating pressing member 40, thereby increasing the battery capacity. In addition, the through hole 421 also plays a role in weight reduction.

In one possible implementation, the number of the through holes 421 may be 5, 8, 10, or the like, and are uniformly distributed along the width direction of the protruding portion 42, and the projection area of the through holes 421 is 0.05 times, 0.08 times, 0.12 times, or 0.2 times that of the protruding portion 42.

In one possible implementation, the through hole 421 may be circular, rectangular, polygonal, etc., and the through hole 421 penetrates the boss 42 for convenience in manufacturing.

In one possible implementation, the average wall thickness of the base portion 41 is 0.7mm.

In one possible implementation, the height of the boss 42 is 3mm to 10mm. The sufficient protrusion height facilitates the contact of the boss 42 with the cell 30 and the squeezing of the cell 30.

In one possible implementation, the height of the boss 42 may be 3mm, 5mm, 5.7mm, 7mm, or 10mm.

In one possible embodiment, referring to fig. 1, the length of the protrusion 42 is adapted to the length of the battery cell 30 in the thickness direction of the battery, ensuring a stable pressing effect on the battery cell 30. Wherein the thickness direction of the battery is referred to the direction indicated by arrow Y in fig. 1.

In one possible implementation, referring to fig. 4 and 5, an avoidance hole 411 is further formed in the base portion 41, and a surface of the cover plate 20 facing the battery cell 30 has an information identification area, where the avoidance hole 411 corresponds to a position of the information identification area to expose the information identification area.

In one possible implementation, the relief aperture 411 may be a rectangular aperture, or may be other shapes. The information identification area is used for setting a chip, a two-dimensional code, a bar code and the like, so that quality tracing is convenient, and the avoidance hole 411 is formed to prevent the base body 41 from shielding the information identification area.

In one possible implementation, the edge of the avoidance hole 411 is provided with a reinforcing rib 412, the reinforcing rib 412 protrudes from the surface of the base body 41 facing the battery cell 30, and the provision of the reinforcing rib 412 can prevent the avoidance hole 411 from tilting.

In one possible implementation, the ribs 412 may be continuous ribs or discontinuous ribs along the edge of the relief holes 411.

In one possible embodiment, referring to fig. 4 and 5, the surface of the base portion 41 facing the battery cell 30 has an explosion-proof vent 43, and the height of the explosion-proof vent 43 protruding from the surface of the base portion 41 facing the battery cell 30 is 0.1mm to 10mm.

In one possible embodiment, the height of the explosion-proof vent 43 protruding from the side of the base portion 41 facing the cell 30 is 0.1mm, 0.8mm, 3mm, 5mm, 8mm or 10mm. The height of the explosion-proof vent 43 is smaller than the height of the boss 42.

In one possible implementation, the explosion-proof exhaust part 43 is provided with an exhaust hole 431; the projected area of the exhaust hole 431 in the thickness direction of the cover plate 20 is 0.1 to 0.5 times the projected area of the explosion-proof exhaust portion 43. When the battery accidentally causes fire, smoke and combustion, the generated toxic and harmful gas can be discharged to a safe position through the exhaust hole 431, so that the hidden danger of explosion caused by overlarge pressure in the battery is avoided. In addition, the vent 431 is formed to reduce the weight of the insulating pressing member 40, so that the battery is lighter.

In one possible embodiment, the projected area of the exhaust hole 431 is 0.1 times, 0.23 times, 0.4 times, or 0.5 times the projected area of the explosion-proof exhaust portion 43.

In one possible implementation, referring to FIG. 2, the insulating hold-down 40 has a spacing H1 from the inside wall of the housing 10, where 0.5 mm.ltoreq.H2.ltoreq.5 mm. When the insulating pressing member 40 presses the piezoelectric core 30, interference between the insulating pressing member 40 and the inner wall of the accommodating cavity 11 is avoided.

In one possible implementation, the spacing H1 may be 0.5mm, 1mm, 1.5mm, 3mm, or 5mm.

In one possible embodiment, referring to fig. 4 and 5, a mounting hole 413 is further formed in the base portion 41, and a post 50 electrically connected to the tab 31 passes through the mounting hole 413, and a boss 414 is provided at an edge of the mounting hole 413. The boss 414 is used to locate the pole 50.

In one possible implementation, the boss 414 may be a ring structure disposed around the circumference of the mounting hole 413, and the boss 414 may be protruded in a direction approaching the battery cell 30 on a side of the base portion 41 facing the battery cell 30, so that the base portion 41 is connected with the cover plate 20 compactly, and the boss 414 is prevented from occupying the height space of the battery. In other possible embodiments, the boss 414 may also protrude away from the cell 30 on a side of the base portion 41 facing away from the cell 30.

In one possible implementation, the height of the boss is 0.2mm to 2mm and the width of the boss is 0.5mm to 2mm, for example, the height of the boss 414 may be 0.2mm, 0.5mm, 1mm or 2mm and the width of the boss 414 may be 0.5mm, 1mm or 2mm.

Referring to fig. 1 and 2, two of the poles 50 extend to the outer surface of the cap plate 20, the poles 50 are spaced apart from the cap plate 20 to achieve an insulating interaction, one of the poles 50 is connected to the positive tab through the switching piece, so that it can be the positive output terminal of the battery, and the other of the poles 50 is connected to the negative tab through the switching piece, so that it can be the negative output terminal of the battery.

In one possible implementation, one of the first pole piece 331 and the second pole piece 332 is a positive pole piece, and the other is a negative pole piece, wherein the positive pole piece is connected to a positive tab, the negative pole piece is connected to a negative tab, and the positive tab and the negative tab are respectively connected to the two poles 50 through a switching piece, so that real electric energy is exported.

In one possible implementation, referring to fig. 1 and 2, an explosion-proof hole is formed in the cover plate 20, and an explosion-proof valve 21 is installed in the explosion-proof hole, when the pressure in the accommodating cavity 11 is greater than a preset pressure, the explosion-proof valve 21 is opened to form a pressure release channel communicating between the accommodating cavity 11 and the outside air, so as to release the gas in the accommodating cavity 11, reduce the pressure and temperature in the battery, thereby avoiding the problems of explosion or ignition, and improving the safety of the battery.

Referring to fig. 3 and 5, a liquid injection hole 22 is further formed in the cover plate 20, and a liquid inlet channel 415 is formed in the base body 41 of the insulating pressing member 40, wherein the liquid inlet channel 415 is opposite to the liquid injection hole, so that after the housing 10 and the cover plate 20 are assembled, electrolyte is injected into the accommodating cavity 11.

In one possible implementation, referring to fig. 3, the insulating pressing members 40 are two insulating pressing members 40 arranged side by side with a space therebetween. The spacing may be 1.5mm for buffering dimensional errors and variations of the insulating pressing member 40 in the second direction, ensuring that the insulating pressing member 40 is not deformed and stuck in the accommodating chamber 11 due to assembly errors or thermal expansion and contraction.

In one possible implementation, when there are two insulating pressing members 40, the two insulating pressing members 40 may be arranged side by side along the second direction, where the base portion 41 of one insulating pressing member 40 is provided with the liquid inlet channel 415 and the avoiding hole 411, and the base portion 41 of the other insulating pressing member 40 is not required to be provided with the liquid inlet channel 415 and the avoiding hole 411.

In one possible embodiment, when there are two insulating holders 40, two insulating holders 40 may be arranged side by side in the thickness direction of the battery.

It should be noted that, the numerical values and numerical ranges referred to in the present utility model are approximate values, and may have a certain range of errors due to the influence of the manufacturing process, and those errors may be considered to be negligible by those skilled in the art.

In the description of the present utility model, it should be understood that the terms "center", "length", "width", "thickness", "top", "bottom", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", etc. are used to indicate orientations or positional relationships based on the orientations or positional relationships 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 referred location or element must have a specific orientation, in a specific configuration and operation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly attached, detachably attached, or integrally formed; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can lead the interior of two elements to be communicated or lead the two elements to be in interaction relationship. 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 present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

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. A battery, comprising:

a housing (10), wherein the housing (10) is internally provided with a containing cavity (11);

a cover plate (20), the cover plate (20) is connected with the shell (10), and the cover plate (20) resists the opening end of the accommodating cavity (11);

the battery cell (30), the battery cell (30) is arranged in the accommodating cavity (11), the battery cell (30) comprises pole pieces (33) and a diaphragm (32) which are arranged in a stacked mode or are stacked and wound, and the diaphragm (32) extends out of the pole pieces (33) at least one end along the first direction by a distance L, wherein L is more than or equal to 0.1mm and less than or equal to 15mm;

at least one insulating compaction piece (40), insulating compaction piece (40) include base member portion (41) and connect in protruding portion (42) of base member portion (41), base member portion (41) connect in the one side of apron (20) facing towards electric core (30), protruding portion (42) are to deviating from the direction of base member portion (41) protruding, protruding portion (42) extrusion electric core (30), so that electric core (30) are along the compressed compression of first direction is S, wherein, 0.2mm is less than or equal to S is less than or equal to 2 XL.

2. The battery according to claim 1, wherein at least two of the protruding portions (42) are arranged at intervals in the second direction, a tab (31) is connected to a face of the battery cell (30) facing the insulating pressing member (40), and the tab (31) extends between two adjacent protruding portions (42);

along the second direction, the distance between two adjacent protruding parts (42) is larger than the width of the tab (31).

3. The battery according to any one of claims 1-2, wherein a plurality of through holes (421) are formed in the protruding portion (42), and a projected area of the through holes (421) is 0.05-0.2 times as large as a projected area of the protruding portion (42) in a thickness direction of the cover plate (20);

and/or the height of the convex part (42) is 3 mm-10 mm.

4. The battery according to any one of claims 1-2, wherein an avoidance hole (411) is further formed in the base body portion (41), an information identification area is formed on a surface of the cover plate (20) facing the battery core (30), and the avoidance hole (411) corresponds to the position of the information identification area.

5. The battery according to claim 4, wherein the edge of the relief hole (411) is provided with a reinforcing rib (412), and the reinforcing rib (412) protrudes from a surface of the base body portion (41) facing the battery cell (30).

6. The battery according to any one of claims 1-2, characterized in that a side of the base portion (41) facing the battery cell (30) has an explosion-proof vent (43), and the explosion-proof vent (43) protrudes from the side of the base portion (41) facing the battery cell (30) by a height of 0.1mm to 10mm.

7. The battery according to claim 6, wherein the explosion-proof exhaust part (43) is provided with an exhaust hole (431);

in the thickness direction of the cover plate (20), the projection area of the exhaust hole (431) is 0.1-0.5 times that of the explosion-proof exhaust part (43).

8. The battery according to any one of claims 1-2, wherein the insulating pressing member (40) has a distance H1 from the inner side wall of the case (10), wherein 0.5 mm.ltoreq.h1.ltoreq.5 mm.

9. The battery according to claim 2, wherein a mounting hole (413) is further formed in the base portion (41), a post (50) electrically connected to the tab (31) passes through the mounting hole (413), and a boss (414) is provided at an edge of the mounting hole (413).

10. The battery according to claim 2, wherein the insulating pressing members (40) are two arranged side by side in the second direction with a space therebetween.