CN220172337U - Electrochemical device and electric equipment - Google Patents

Abstract

The utility model provides an electrochemical device and electric equipment. Wherein, an electrochemical device comprises: a first housing including a recess and a flange edge disposed at a circumferential edge of the recess; the second shell is used for shielding the opening of the concave part and fixedly connected with the flange edge, and the concave part and the second shell enclose an accommodating cavity; an electrode assembly disposed on the first case; the flange edge is connected with the second shell through a first structure, a space is arranged between the first end and the second end of the first structure, the electrochemical device further comprises a second structure, and the projection of the second structure in the first direction of the first shell covers the space. The technical scheme applied by the application can effectively solve the problems of complex production process of the battery, easy overflow of electrolyte in the formation process and high defective rate of the battery in the related technology.

Description

Electrochemical device and electric equipment

Technical Field

The utility model relates to the technical field of batteries, in particular to an electrochemical device and electric equipment.

Background

Lithium ion batteries have many advantages, and become a major source of power for consumer electronics and electric vehicles. The battery needs to be formed after assembly, so that active substances in the battery can be activated, and the battery can be used normally.

In the related art, a battery generally comprises a housing and a battery core arranged in the housing, wherein a liquid injection hole is further formed in the housing, and electrolyte is injected into the liquid injection hole after the battery is assembled, so that the battery is formed. After the liquid injection is completed, the liquid injection hole is required to be welded and sealed by using a sealing nail.

However, in the welding sealing process of sealing nails for sealing liquid injection holes in the prior art, the positioning accuracy requirement on the sealing nails is high, so that the yield of the battery is low, the sealing nails of the product are protruded, and the whole space utilization rate of the battery is low; furthermore, the sealing nails and the like have more structural members, so that the materials have high cost and the process is more complex.

Disclosure of Invention

The utility model provides an electrochemical device and electric equipment, which are used for solving the problems of complex sealing process, low space utilization rate, higher material cost and lower yield of batteries in the related technologies.

In one aspect, the present utility model provides an electrochemical device comprising: a first housing including a recess and a flange provided at least one side edge of the recess; the second shell is used for shielding the opening of the concave part and fixedly connected with the flange edge, and the concave part and the second shell enclose an accommodating cavity; an electrode assembly disposed on the first case; the flange edge is connected with the second shell through a first structure, a space is arranged between the first end and the second end of the first structure, the electrochemical device further comprises a second structure, and the projection of the second structure in the first direction of the first shell covers the space.

In some embodiments, the flange is fixedly connected to the second housing by welding, and the first structure includes a first weld located circumferentially outward of the recess, the first and second ends of the first weld forming a space therebetween.

In some embodiments, the second structure includes a second weld, a projected coverage space of the second weld in a first direction of the first shell.

In some embodiments, the distance between the second weld and the edge of the flange edge is L3, and the minimum distance between the first weld and the second weld is L4, 0.ltoreq.L4: l3 is less than or equal to 10.

In some embodiments, the spacing has a length L5, and the second weld has a length L6, 1.ltoreq.L5: l6 is less than or equal to 2.

In some embodiments, the first structure comprises a first weld, the electrochemical device further comprising at least one third weld, the third weld being located on a side of the first weld remote from the recess; the third weld partially overlaps the first weld in the first direction, and the third weld extends to the edge of the flange edge.

In some embodiments, the third weld is disposed at an angle to the first weld, the third weld extending from the first end of the first weld to the edge of the flange edge; the fourth weld joint is arranged at an angle with the first weld joint, and an included angle between the third weld joint and the first weld joint is between 45 and 90 degrees.

In some embodiments, the second structure includes a second weld, the first end of the second weld being connected to the third weld.

In some embodiments, the electrochemical device further comprises at least one fourth weld, the fourth weld being located on a side of the first weld remote from the recess, the gap being located between the third weld and the fourth weld, the fourth weld partially overlapping the first weld in the first direction, and the fourth weld extending to the edge of the flange rim.

In some embodiments, the first case is provided with a mounting hole thereon, and the electrochemical device further includes: the battery cell is arranged in the accommodating cavity and comprises a first electrode lug and a second electrode lug, the first electrode lug is connected with the electrode assembly, and the second electrode lug is connected with the first shell;

the electrode assembly includes: the pole is penetrated in the mounting hole; the insulating piece is arranged between the pole post and the mounting hole; the pole gasket is arranged between the insulating piece and the first pole lug and is electrically connected with the first pole lug and the pole.

In some embodiments, the width w1 of the first weld is between 0.05mm and 0.15 mm; and/or the distance L1 between the first weld and the recess is greater than or equal to 0.05mm; and/or the width L2 of the flange edge is greater than or equal to 0.1mm.

In some embodiments, the shape of the second weld 42 is a straight line, a sinusoidal line, an arc, a curve, a spiral.

On the other hand, the utility model also provides electric equipment, which comprises the electrochemical device.

The electrochemical device comprises a first shell and a second shell, wherein the first shell is provided with a concave part and a flange edge positioned on the outer side of the periphery of the concave part, the flange edge of the first shell is fixedly connected with the second shell through a first structure, and the concave part and the second shell enclose a containing cavity for containing a battery cell and electrolyte. An electrode assembly is arranged on the first shell, and a tab of the battery core can be connected with the electrode assembly. Through setting up the interval, the interval is used for injecting electrolyte, and the projection of rethread second structure in first direction covers the interval with sealed interval, simplifies annotating liquid and sealing technology, need not to use the locating nail, when saving material cost, can promote electrochemical device's yields, also makes electrochemical device's volume littleer simultaneously, helps promoting electrochemical device's energy density.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.

Fig. 1 is a schematic perspective view of an electrochemical device according to an embodiment of the present utility model;

fig. 2 is a schematic view showing an exploded structure of an electrochemical device according to an embodiment of the present utility model;

fig. 3 is a front view of an electrochemical device according to an embodiment of the present utility model;

FIG. 4 is a cross-sectional view of the electrochemical device of FIG. 3 in the A-A direction, provided in an embodiment of the present utility model;

fig. 5 is an enlarged structural schematic view at C of the electrochemical device of fig. 4 according to an embodiment of the present utility model;

fig. 6 is a B-B cross-sectional view of the electrochemical device of fig. 3 provided in an embodiment of the present utility model;

fig. 7 is an enlarged schematic view of a structure at D of the electrochemical device of fig. 6 according to an embodiment of the present utility model;

fig. 8 is an enlarged structural view at E of the electrochemical device of fig. 3 provided in accordance with an embodiment of the present utility model, wherein fig. 8 illustrates a first embodiment of a second weld;

fig. 9 is an enlarged schematic view of the electrochemical device E of fig. 3 according to an embodiment of the present utility model, wherein fig. 9 shows a second embodiment of a second weld;

fig. 10 is an enlarged structural view at E of the electrochemical device of fig. 3 provided in accordance with an embodiment of the present utility model, wherein fig. 10 illustrates a third embodiment of a second weld;

fig. 11 is an enlarged structural view at E of the electrochemical device of fig. 3 provided in accordance with an embodiment of the present utility model, wherein fig. 11 shows a fourth embodiment of the second weld;

fig. 12 is an exploded view of an electrochemical device semi-finished product according to an embodiment of the present utility model, wherein fig. 12 shows a state in which the electrochemical device semi-finished product is not processed with a second weld;

fig. 13 is a schematic perspective view of an electrochemical device semi-finished product according to an embodiment of the present utility model, wherein fig. 13 shows a state in which the electrochemical device semi-finished product is not processed with a second weld;

fig. 14 is an enlarged schematic view of the structure of the electrochemical device semi-finished product F of fig. 13 according to an embodiment of the present utility model;

fig. 15 is a schematic perspective view of an electrochemical device semi-finished product according to an embodiment of the present utility model, wherein fig. 15 shows a state of the electrochemical device semi-finished product after processing a second weld;

fig. 16 is a schematic view illustrating a structure of an electrochemical device according to an embodiment of the present utility model when a semi-finished product of the electrochemical device is cut into an electrochemical device.

Reference numerals illustrate:

1-interval; 2-a receiving cavity; 10-a first housing; 11-a recess; 12-flange edges; 121-a diversion recess; 13-mounting holes; 14-caching the convex part; 141-a cache chamber; 15-a liquid injection hole; 20-a second housing; 21-a first plate; 22-a second plate; 30-an electrode assembly; 31-pole; 311-first column section; 312-second column section; 313-a third column section; 32-an insulator; 321-a first insulating member; 3211-a first insulating sheet; 3212-insulating rings; 322-a second insulator; 33-pole gaskets; 41-a first weld; 42-a second weld; 43-liquid injection channel; 431-third weld; 432-fourth weld; 44-fifth weld; 45-sixth weld; 47-seventh weld; 51-a first tab; 52-second pole ear; 60-an electrochemical device; 70-cutting the rim charge; 80-semi-finished electrochemical device.

Specific embodiments of the present utility model have been shown by way of the above drawings and will be described in more detail below. The drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but rather to illustrate the inventive concepts to those skilled in the art by reference to the specific embodiments.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center," "longitudinal," "length," "width," "upper," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus 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 at least one such feature. In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "secured," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. 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 "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, reference to the terms "optionally," "alternative embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

In the related art, a battery generally comprises a housing and a battery core arranged in the housing, wherein a liquid injection hole is further formed in the housing, and electrolyte is injected into the liquid injection hole after the battery is assembled, so that the battery is formed. After the liquid injection is completed, the liquid injection hole is required to be welded and sealed by using a sealing nail.

Meanwhile, in the operation process of sealing the liquid injection hole by the sealing nail, the positioning nail needs to be inserted into the positioning hole, and the positioning requirement of the positioning nail is high in the process, so that the welding yield of the sealing nail is low. In addition, as the sealing nails are protruded out of the battery shell after being welded, a certain volume is occupied, so that the space utilization rate of the battery is low and the energy density is low.

The utility model provides an electrochemical device, which solves the problems of complex production process, easy overflow of electrolyte in the formation process and high defective rate of batteries in the related technologies.

Fig. 1 is a schematic perspective view of an electrochemical device according to an embodiment of the present utility model; fig. 2 is a schematic view showing an exploded structure of an electrochemical device according to an embodiment of the present utility model; fig. 3 is a front view of an electrochemical device according to an embodiment of the present utility model; fig. 8 is an enlarged structural view at E of the electrochemical device of fig. 3 provided in an embodiment of the present utility model, wherein fig. 8 shows a first embodiment of a second weld.

As shown in fig. 1 to 3 and fig. 8, the electrochemical device of the present embodiment includes: the first case 10, the second case 20, and the electrode assembly 30.

Wherein the first housing 10 comprises a recess 11 and a flange 12 provided at least one side edge of the recess 11; the second shell 20 shields the opening of the concave part 11 and is fixedly connected with the flange edge 12, and the concave part 11 and the second shell 20 enclose a containing cavity 2; the electrode assembly 30 is disposed on the first case 10; wherein the flange 12 is connected to the second casing 20 by a first structure, and a space is provided between a first end and a second end of the first structure, and the electrochemical device 60 further includes a second structure, wherein a projection of the second structure in a first direction (y direction shown in fig. 1 and 8) of the first casing covers the space 1.

By applying the technical scheme of the embodiment, the electrochemical device comprises a first shell 10 and a second shell 20, wherein the first shell 10 is provided with a concave part 11 and a flange 12 positioned on the peripheral outer side of the concave part 11, the flange 12 of the first shell 10 is fixedly connected with the second shell 20 through a first structure, and the concave part 11 and the second shell 20 enclose a containing cavity 2 for containing a battery cell and electrolyte. The first case 10 is provided with an electrode assembly 30, and tabs of the battery cells can be connected with the electrode assembly 30. In the process of assembly, first casing 10 and second casing 20 are connected through first structure earlier, owing to have interval 1 between first end and the second end of first structure, interval 1 can form the notes liquid mouth that electrochemical device injected into electrolyte, in the in-process of injecting electrolyte, can make it communicate with annotating the liquid mouth through setting up electrolyte buffer structure in addition, with annotating liquid hole 15 setting on electrolyte buffer structure, electrolyte is through annotating liquid hole and flow through electrolyte buffer structure and get into and hold intracavity 2, contact with the electric core and become. After the liquid injection is completed, the second structure can cover the interval 1 to realize the sealing of the liquid injection buckle.

According to the battery, the interval is used for injecting electrolyte, the projection of the second structure in the first direction covers the interval to close the interval, the liquid injection and sealing process is simplified, the positioning nails are not needed, the material cost is saved, the yield of the electrochemical device can be improved, meanwhile, the volume of the electrochemical device is smaller, and the energy density of the electrochemical device is improved.

In one embodiment, the electrochemical device may be in communication with the electrolyte buffer structure, so that the electrolyte containing space can be increased, and sufficient electrolyte can be injected at one time without secondary replenishment.

In addition, when electrolyte is injected, a certain space is reserved between the liquid level of the electrolyte and the electrolyte injection hole, and if the cell expands in the formation process, the liquid level of the electrolyte can rise but cannot overflow from the electrolyte injection hole, so that the problems of waste and pollution to an electrochemical device caused by overflow of the electrolyte are solved. After formation is completed, the gap 1 may be closed by a second structure and the electrolyte buffer structure removed.

The electrochemical device of the present embodiment may be a steel-can battery.

It should be noted that, the "electrolyte buffer structure" may be an external structure independent of the first casing 10 and the second casing 20, or may be an integrated structure with the first casing 10 and/or the second casing 20.

Further, the first structure of the present embodiment may be formed by welding, riveting, or crimping, for example, to fix the flange 12 to the second housing 20. Similarly, the second structure may be a weld, rivet, or crimp.

As shown in fig. 1 to 3, in the present embodiment, the flange 12 and the second housing 20 are fixedly connected by welding, and the first structure includes a first weld 41, the first weld 41 being located on the circumferential outside of the recess 11, and a space 1 being formed between a first end and a second end of the first weld 41.

The first weld 41 may be a continuous line segment or a combination of multiple connected line segments, and the first end and the second end of the first weld 41 may be spaced from each other on the same side or on different sides of the electrode structure. The first weld 41 is formed by laser welding, which is simple in process and convenient to operate.

The width w1 of the first weld 41 is between 0.05mm and 0.15 mm. If the width w1 of the first welding bead 41 is too small, it may cause easy welding between the first case 10 and the second case 20, affecting the strength of the electrochemical device, and if the width w1 of the first welding bead 41 is too large, it may increase costs on the one hand, causing unnecessary waste, and on the other hand, the width w1 is too large, which means that the flange 12 needs to be set wider, increasing the volume of the electrochemical device.

Accordingly, the second structure may also take various forms, such as welding, riveting or crimping to close the space 1.

As shown in fig. 8, in the present embodiment, the second structure includes a second weld 42, and the second weld 42 covers the space 1 in the first direction (y-direction). The width w2 of the second weld 42 is the same as the width w1 of the first weld 41.

In this embodiment, the first structure and the second structure are both welds. Of course, in other embodiments, the first structure and the second structure may be different, for example, the first structure is a weld, and the second structure is riveted or crimped.

As shown in fig. 8, in the present embodiment, the distance between the second weld bead 42 and the edge of the flange side 12 is L3, and the minimum distance between the first weld bead 41 and the second weld bead 42 is L4,0 Σ4: l3 is less than or equal to 10. The second weld 42 can not only function as the closing space 1, but also increase the connection strength of the first casing 10 and the second casing 20. Specifically, the second weld 42 may be disposed closer to the flange edge or may be disposed flush with the first weld 41.

Illustratively, L4: the ratio of L3 may be 0, where the second weld 42 is flush with the first weld 41, L4: the ratio of L3 may also be 0.5, 1, 3, 5, 8, 9, or 10.

As shown in FIG. 8, in this embodiment, the length of the gap 1 is L5, the length of the second weld 42 is L6, and 1.ltoreq.L5: l6 is less than or equal to 2. The above structure can ensure the sealing effect of the second weld 42 on the space 1 on the one hand, and can increase the connection strength of the first casing 10 and the second casing 20 on the other hand.

Illustratively, L5: the ratio of L6 may be 1, 1.2, 1.4, 1.5, 1.7, or 2.

Further, as shown in fig. 1 and 8, in the present embodiment, the electrochemical device further includes at least one third weld 431, and the third weld 431 is located on a side of the first weld 41 away from the recess 11; the third weld 431 partially overlaps the first weld 41 in the first direction (y-direction), and the third weld 431 extends to the edge of the flange edge 12. The third weld 431 can act as a drain during electrolyte injection.

Further, as shown in fig. 1 and 8, in the present embodiment, the second structure includes a second weld 42, and a first end of the second weld 42 is connected to a third weld 431.

Further, as shown in fig. 1 and 8, in the present embodiment, the electrochemical device further includes at least one fourth weld 432, the fourth weld 432 is located on a side of the first weld 41 remote from the recess 11, the space 1 is located between the third weld 431 and the fourth weld 432, the fourth weld 432 at least partially overlaps the first weld 41 in the first direction (y-direction), and the fourth weld 432 extends to an edge of the flange side 12; the second end of the second weld 42 is connected to a fourth weld 432. In the above structure, the second weld closes the space 1 by connecting the third weld 431 and the fourth weld 432.

Specifically, the first direction (y direction), the second direction (x direction), and the third direction (z direction) are arranged in pairs perpendicularly.

In this embodiment, the electrochemical device 60 further includes a liquid injection channel 43 disposed between the flange 12 and the second housing 20, the liquid injection channel 43 communicates with the space 1, and the second weld 42 seals the space 1 by sealing the liquid injection channel 43. In the above structure, the liquid injection channel 43 can play a role in drainage during the injection of the electrolyte, so that the electrolyte cannot flow between the flange edge 12 and the second housing 20, thereby reducing the loss probability of the electrolyte and reducing the pollution probability of the first housing 10 and the second housing 20. The third weld 431 extends from the first end of the first weld 41 to the edge of the flange edge 12; the fourth weld 432 extends from the second end of the first weld 41 to the edge of the flange edge 12. Electrolyte can flow into the receiving chamber along the liquid injection channel 43 formed by the third weld 431 and the fourth weld 432, so that electrolyte does not flow between the flange 12 and the second housing 20.

Further, the third weld 431 is disposed at an angle to the first weld 41; the fourth weld 432 is disposed at an angle to the first weld 41.

Specifically, the included angle between the third welding seam 431 and the first welding seam 41 is between 45 ° and 90 °, and this arrangement can enable the injection channel 43 to form a larger opening near the edge of the flange edge 12, so as to facilitate the injection of the electrolyte.

Similarly, the fourth weld 432 is at an angle between 45 ° and 90 ° to the first weld 41. This arrangement allows the injection channel 43 to form a larger opening near the edge of the flange 12, thereby facilitating electrolyte injection.

For example, the angle between the third weld 431 and the first weld 41 may be 45 °, 55 °, 65 °, 75 °, 85 °, or 90 °. The angle between the fourth weld 432 and the first weld 41 may be 45 °, 55 °, 65 °, 75 °, 85 °, or 90 °.

In some embodiments, the first end of the second weld 42 is connected to the third weld 431, and the second end of the second weld 42 is a fourth weld 432. The second weld 42 closes the gap 1 by closing the liquid injection passage 43.

Specifically, the width w3 of the third weld 431 and the width w4 of the fourth weld 432 are each between 0.05mm and 0.15 mm.

The present embodiment also provides various structures of the second weld, as shown in fig. 8, the second weld is a straight line, the first end of the second weld 42 is disposed to cross the third weld 431, and the second end of the second weld 42 is disposed to cross the fourth weld 432.

Fig. 9 is an enlarged schematic view of the electrochemical device E of fig. 3 according to an embodiment of the present utility model, and fig. 9 shows a second embodiment of a second weld. Specifically, as shown in fig. 9, the second weld 42 is a straight line, and both the first end and the second end of the second weld 42 are disposed to intersect the first weld 41.

Fig. 10 is an enlarged schematic view of the electrochemical device E of fig. 3 according to an embodiment of the present utility model, and fig. 10 shows a third embodiment of the second weld. Specifically, as shown in fig. 10, the second weld 42 is an arc, the first end of the second weld 42 is disposed to intersect the third weld 431, and the second end of the second weld 42 is disposed to intersect the fourth weld 432.

Fig. 11 is an enlarged schematic view of the electrochemical device E of fig. 3 according to an embodiment of the present utility model, and fig. 11 shows a fourth embodiment of the second weld. Specifically, as shown in fig. 11, the second weld 42 is of a fold line structure, specifically, of a wavy line structure. The first end of the second weld 42 is disposed across the third weld 431 and the second end of the second weld 42 is disposed across the fourth weld 432.

Of course, the second weld may also be provided in a sinusoidal or curvilinear or spiral line or other continuous linear configuration.

FIG. 4 is a cross-sectional view of the electrochemical device of FIG. 3 in the A-A direction, provided in an embodiment of the present utility model; fig. 5 is an enlarged structural schematic view at C of the electrochemical device of fig. 4 according to an embodiment of the present utility model; fig. 6 is a B-B cross-sectional view of the electrochemical device of fig. 3 provided in an embodiment of the present utility model; fig. 7 is an enlarged schematic view of a structure of the electrochemical device D of fig. 6 according to an embodiment of the present utility model.

Further, as shown in fig. 1 to 7, in the present embodiment, the electrochemical device further includes a battery cell disposed in the housing chamber 2, the battery cell including a first tab 51 and a second tab 52, the first tab 51 being connected with the electrode assembly 30, the second tab 52 being connected with the first case 10. Specifically, the first tab 51 and the electrode assembly 30 form a positive electrode structure of the electrochemical device 60, and the second tab 52 and the first case 10 form a negative electrode structure of the electrochemical device 60.

Specifically, the first case 10 and the second tab 52 may be connected by welding, and a sixth weld 45 (shown in fig. 5) formed by welding. The first housing 10 and the second housing 20 are both made of metal, preferably stainless steel. The material of the second tab 52 is preferably nickel, and may be nickel-plated with copper. The first tab 51 and the second tab 52 may be located on the same side of the battery cell, or may be located on different sides of the battery cell. When the first tab 51 and the second tab 52 are located on the same side of the battery cell, the left-right relationship is not limited.

As shown in fig. 6 and 7, in the present embodiment, the first case 10 is provided with mounting holes 13, and the electrode assembly 30 includes: a pole 31, an insulator 32 and a pole washer 33.

Wherein the pole 31 is penetrated in the mounting hole 13; an insulator 32 is provided between the pole 31 and the mounting hole 13 to insulate the pole 31 from the first housing 10; the pole pad 33 is made of a conductive material and is disposed between the insulating member 32 and the first tab 51, and the pole pad 33 is electrically connected to the first tab 51 and the pole 31.

Specifically, as shown in fig. 6 and 7, in the present embodiment, the pole piece 33 and the first tab 51 are connected by welding, and the pole 31 is connected in the mounting hole 13 by caulking. The pole tab 33 and the first tab 51 are connected by welding, and a fifth weld 44 (shown in fig. 7) is formed by welding. The tab 31 is connected to the first tab 51 through the tab spacer 33, and the contact area between the tab 31 and the first tab 51 can be increased by the tab spacer 33, thereby contributing to a reduction in the internal resistance of the electrochemical device 60.

As shown in fig. 1 and 7, in the present embodiment, the pole 31 includes a first pole segment 311 located outside the first housing 10, a second pole segment 312 located in the mounting hole 13, and a third pole segment 313 located below the pole pad 33, the diameters of the first pole segment 311 and the third pole segment 313 are larger than the diameter of the second pole segment 312, and the insulator 32 and the pole pad 33 are sandwiched between the first pole segment 311 and the third pole segment 313. The pole 31 is provided by caulking, so that the pole 31 can be stably connected to the mounting hole 13, and the insulator 32 can be stably connected.

As shown in fig. 1 and 7, in the present embodiment, the insulating member 32 includes a first insulating member 321 and a second insulating member 322, the first insulating member 321 includes a first insulating sheet 3211 located between the first pole section 311 and the first housing 10, and an insulating ring 3212 located between the second pole section 312 and the mounting hole 13, and the second insulating member 322 includes a second insulating sheet located between the pole gasket 33 and the first housing 10.

As shown in fig. 7, the diameter of the first insulating sheet 3211 is greater than or equal to the diameter of the first column section 311 so that the first column section 311 is provided insulated from the first housing 10. The insulating ring 3212 can realize insulation arrangement between the second column section 312 and the hole wall of the mounting hole 13, and the second insulating piece 322 is in contact fit with the insulating ring 3212 and plays a role of insulating the pole 31 and the first casing 10. Meanwhile, the second insulating member 322 has a diameter larger than that of the pole piece 33 so that the pole piece 33 is provided to be insulated from the first housing 10.

As shown in fig. 3 and 8, in the present embodiment, the distance L1 between the first weld 41 and the recess 11 is greater than or equal to 0.05mm. The connection region of the recess 11 and the flange 12 belongs to a weak region, and if the distance L1 between the first weld 41 and the recess 11 is too small, breakage of the first case 10 at the time of welding is likely to occur, so that the distance L1 between the first weld 41 and the recess 11 can be made to be 0.05mm or more.

As shown in fig. 3 and 8, in the present embodiment, the width L2 of the flange side 12 is greater than or equal to 0.1mm. Too small a width L2 of the flange side 12 compresses the space of the first weld 41 and the second weld 42, affecting the welding strength, and thus the width L2 of the flange side 12 may be made to be greater than or equal to 0.1mm.

The embodiment also provides a structure of an electrochemical device semi-finished product. Because the speed of the cell absorbing electrolyte is slow, enough electrolyte cannot be injected once, and secondary injection is often needed after formation, so that the production efficiency of the battery is affected by the secondary injection. In addition, because secondary liquid injection is needed, the liquid injection hole can not be blocked during battery formation, and the battery core can expand during battery formation, so that electrolyte is easy to overflow and generate loss, and the battery can be polluted. The electrochemical device semi-finished product of the embodiment comprises an electrolyte buffer structure for buffering the electrolyte, and providing sufficient floating space for the electrolyte when the battery cell expands, so that the electrolyte is prevented from overflowing during formation. An example of the electrochemical device semi-finished product of the present utility model will be described below with reference to the accompanying drawings.

Fig. 12 is an exploded view of an electrochemical device semi-finished product according to an embodiment of the present utility model, wherein fig. 12 shows a state in which the electrochemical device semi-finished product is not processed with a second weld; fig. 13 is a schematic perspective view of an electrochemical device semi-finished product according to an embodiment of the present utility model, wherein fig. 13 shows a state in which the electrochemical device semi-finished product is not processed with a second weld; fig. 14 is an enlarged schematic view of the structure of the electrochemical device semi-finished product F of fig. 13 according to an embodiment of the present utility model; fig. 15 is a schematic perspective view of an electrochemical device semi-finished product according to an embodiment of the present utility model, wherein fig. 15 shows a state of the electrochemical device semi-finished product after processing a second weld; fig. 16 is a schematic view illustrating a structure of an electrochemical device according to an embodiment of the present utility model when a semi-finished product of the electrochemical device is cut into an electrochemical device.

As shown in fig. 12 to 16, the electrochemical device semi-finished product 80 of the present embodiment includes an electrolyte buffer structure. The electrolyte buffering structure is formed by combining a first casing 10 and a second casing 20. Specifically, in the present embodiment, the first housing 10 includes a recess 11, a buffer protrusion 14 located above the recess 11, and a flow guiding recess 121 communicating the accommodating recess and the buffer protrusion 14, and the buffer protrusion 14 is provided with a liquid injection hole 15, and the electrolyte can be injected into the recess 11 from the liquid injection hole 15.

When the first casing 10 and the second casing 20 are connected, the concave portion 11 and the second casing 20 enclose a containing cavity 2, the buffer convex portion 14 and the second casing 20 enclose a buffer cavity 141, and the flow guiding concave portion 121 and the second casing 20 enclose a liquid injection channel 43. The accommodating cavity 2 is used for accommodating the battery core and most of electrolyte, and the buffer cavity 141 is used for buffering the electrolyte and providing sufficient floating space for the electrolyte when the battery core expands, so that the electrolyte is prevented from overflowing during formation. The liquid injection passage 43 can ensure the flow area of the electrolyte, and the electrolyte can flow smoothly.

After the formation is completed, the diversion recess 121 is kneaded (the diversion recess 121 is shown in fig. 14 before being kneaded), the diversion recess 121 is made to be closely attached to the second casing 20, and then the second weld joint 42 is formed by welding, the liquid injection channel 43 is closed, and further the sealing of the gap 1 is achieved so that the electrolyte does not flow out from the electrochemical device 60. After the second weld 42 is welded, the electrochemical device blank 80 may be cut, and the electrolyte buffer structure, the more flange sides 12, and the second case 20 (the cut filler 70 shown in fig. 16) may be cut off to reduce the volume of the electrochemical device 60.

As shown in fig. 13, the second case 20 has a plate-like structure, and the electrochemical device semi-finished product 80 has a main body portion of the second case 20 including a first plate 21, and the first plate 21 is provided so as to correspond to the recess 11 and the flange 12. The second housing 20 further includes a second plate 22 connected to the first plate 21, where the second plate 22 is disposed corresponding to the buffer protrusion 14. The flange 12 also includes a main portion disposed on the outer circumferential side of the recess 11 and a sub portion disposed on the outer circumferential side of the buffer projection 14, the sub portion of the flange 12 and the second plate 22 are welded to form a seventh weld 47, a first end of the seventh weld 47 is connected to a first end of the first weld 41, a second end of the seventh weld 47 is connected to a second end of the first weld 41, and after the electrochemical device semi-finished product 80 is cut, only the remaining portions of the seventh weld 47, that is, the third weld 431 and the fourth weld 432.

Of course, in other embodiments of the electrochemical device semi-finished product 80, the flow guiding concave portion 121 and the buffer convex portion 14 may be disposed on the second casing 20, and the flange 12 of the first casing 10 may be provided with corresponding plate bodies and connected by welding.

The utility model also provides an electric device (not shown in the figure), which comprises the electrochemical device. The electrochemical device 60 has the advantages of convenient processing, low cost and high yield, so that the electric equipment with the electrochemical device also has the advantages.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; 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 with equivalents; such modifications and substitutions do not depart from the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present utility model.

Claims (14)

1. An electrochemical device, comprising:

-a first housing (10), the first housing (10) comprising a recess (11) and a flange rim (12) provided at the rim of the recess (11);

the second shell (20) is used for shielding the opening of the concave part (11) and is fixedly connected with the flange edge (12), and the concave part (11) and the second shell (20) enclose a containing cavity (2);

an electrode assembly (30) disposed on the first case (10);

the electrochemical device further comprises a second structure, wherein the flange edge (12) is connected with the second shell (20) through a first structure, a space (1) is arranged between the first end and the second end of the first structure, and the projection of the second structure in the first direction of the first shell (10) covers the space (1).

2. Electrochemical device according to claim 1, characterized in that the flange rim (12) is fixedly connected to the second housing (20) by welding, the first structure comprising a first weld (41), the first weld (41) being located circumferentially outside the recess (11), a space (1) being formed between a first end and a second end of the first weld (41).

3. Electrochemical device according to claim 2, characterized in that the second structure comprises a second weld (42), the projection of the second weld (42) in the first direction of the first casing covering the gap (1).

4. An electrochemical device according to claim 3, characterized in that the distance between the second weld bead (42) and the edge of the flange rim (12) is L3, the minimum distance between the first weld bead (41) and the second weld bead (42) is L4, 0.ltoreq.l4: l3 is less than or equal to 10.

5. An electrochemical device according to claim 3, characterized in that the length of the gap (1) is L5, the length of the second weld (42) is L6, 1+.l 5: l6 is less than or equal to 2.

6. The electrochemical device according to claim 1, wherein,

the first structure comprises a first weld (41),

the electrochemical device further comprises at least one third weld (431),

the third weld (431) is located on the side of the first weld (41) remote from the recess (11);

the third weld (431) partially overlaps the first weld (41) in a first direction,

the third weld seam (431) extends to the edge of the flange edge (12).

7. The electrochemical device according to claim 6, characterized in that the third weld (431) is arranged at an angle to the first weld (41), the angle between the third weld (431) and the first weld (41) being between 45 ° and 90 °.

8. The electrochemical device according to claim 6, wherein,

the second structure includes a second weld (42),

the first end of the second weld (42) is connected to the third weld (431).

9. The electrochemical device according to claim 6, wherein,

the electrochemical device further comprises at least one fourth weld (432),

the fourth weld (432) is located on a side of the first weld (41) remote from the recess (11), the space (1) is located between the third weld (431) and the fourth weld (432), the fourth weld (432) at least partially overlaps the first weld (41) in a first direction, and the fourth weld (432) extends to an edge of the flange edge (12).

10. Electrochemical device according to any one of claims 1 to 9, characterized in that the first casing (10) is provided with mounting holes (13), the electrochemical device further comprising:

the battery cell (50) is arranged in the accommodating cavity (2), the battery cell (50) comprises a first tab (51) and a second tab (52), the first tab (51) is connected with the electrode assembly (30), and the second tab (52) is connected with the first shell (10).

11. The electrochemical device according to claim 10, wherein the electrode assembly (30) comprises:

the pole column (31) is arranged in the mounting hole (13) in a penetrating way;

an insulator (32) provided between the pole (31) and the mounting hole (13);

and the pole gasket (33) is arranged between the insulating piece (32) and the first pole lug (51), and the pole gasket (33) is electrically connected with the first pole lug (51) and the pole (31).

12. The electrochemical device according to claim 2, wherein,

the width w1 of the first weld seam (41) is between 0.05mm and 0.15 mm;

and/or the distance L1 between the first weld (41) and the recess (11) is greater than or equal to 0.05mm;

and/or the width L2 of the flange edge (12) is greater than or equal to 0.1mm.

13. The electrochemical device according to claim 3, wherein,

the shape of the second welding seam (42) is a straight line, a positive chord line, an arc line, a curve and a spiral line.

14. An electrical consumer comprising an electrochemical device according to any one of claims 1 to 13.