CN220963528U - Battery shell and lithium ion battery - Google Patents

Abstract

The utility model relates to a battery shell and a lithium ion battery, wherein the battery shell comprises a shell, a top cover and a flow dividing plate, and the shell is provided with a containing cavity with one end open; the top cover is covered at the opening of the shell, and a liquid injection port is formed in the top cover; the flow distribution plate is arranged in the accommodating cavity and is close to one end of the top cover, the flow distribution plate is connected with the side wall of the accommodating cavity, the flow distribution plate is arranged opposite to the liquid injection port, and the projection of the liquid injection port in the vertical direction is positioned in the flow distribution plate. Through setting up the flow distribution plate to set up the flow distribution plate relatively with annotating the liquid mouth, so that when pouring electrolyte from annotating liquid mouth department, electrolyte can pass through the flow distribution plate earlier, in order to reduce the kinetic energy of electrolyte through the resistance of flow distribution plate to electrolyte, thereby reduce the impact force that flowing electrolyte is used on the battery core package, and then prevent that the pole piece from causing the damage because of the impact of electrolyte, influence battery performance. Through the structure, the impact force to the battery core pack when electrolyte is injected is reduced, the damage to the pole piece is avoided, and the influence on the battery performance is reduced.

Description

Battery shell and lithium ion battery

Technical Field

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

Background

The lithium ion battery is generally composed of a positive electrode plate, a negative electrode plate, electrolyte, a shell and the like. In the battery production process, electrolyte is injected into the battery through the liquid injection hole on the top cover. The liquid injection hole is positioned in the middle area of the top cover, namely between the anode lug and the cathode lug. Because electrolyte is injected in a positive pressure liquid injection mode, the distance between the liquid injection hole and the upper boundary of the core pack is short, and no buffer exists in the middle area of the core pack to relieve the impact of the electrolyte, the core pack in the area is easily subjected to larger impact force of the electrolyte, and the pole piece is easily damaged, so that the battery performance is reduced and the potential safety hazard of the battery exists.

Disclosure of utility model

Accordingly, it is necessary to provide a battery case and a lithium ion battery, which solve the technical problem that the battery case is not used for buffering the impact of the electrolyte and the core pack is easily damaged in the prior art.

A battery housing, the battery housing comprising:

a housing configured with a receiving chamber having one end opened;

the top cover is covered at the opening of the shell, and a liquid injection port is formed in the top cover;

The flow dividing plate is arranged in the accommodating cavity and is close to one end of the top cover, the flow dividing plate is connected with the side wall of the accommodating cavity, the flow dividing plate is arranged opposite to the liquid injection port, and the projection of the liquid injection port in the vertical direction is positioned in the flow dividing plate.

In one embodiment, the diverter plate includes:

the buffer part is arranged opposite to the liquid injection port;

and the two connecting parts are connected to the two ends of the buffer part, and the two connecting parts are respectively connected with the two opposite side walls of the accommodating cavity.

In one embodiment, the buffer portion is provided with a plurality of flow dividing holes at intervals, and the flow dividing holes penetrate through the buffer portion along the thickness direction of the buffer portion.

In one embodiment, the distance between the side of the buffer facing the top cover and the end face of the housing where the opening is located is between 5mm and 10 mm.

In one embodiment, the width of the diverter plate ranges between 20mm and 40 mm.

In one embodiment, two opposite side walls of the accommodating cavity are respectively provided with a clamping groove, and two ends of the flow distribution plate are clamped in the clamping grooves.

In one embodiment, a protruding portion protruding in a direction away from the side wall is formed on the side wall of the accommodating cavity, and the clamping groove is clamped on the protruding portion.

In one embodiment, the battery case further includes:

The clamping plate is bent along the two ends of the length direction towards the direction close to the side wall of the accommodating cavity and fixedly connected with the side wall of the accommodating cavity, and the middle section of the clamping plate is spaced from the side wall of the accommodating cavity, so that the two ends and the middle section of the clamping plate are enclosed with the side wall of the accommodating cavity to define the clamping groove.

In one embodiment, the diverter plate is made of a temperature resistant and insulating material.

A lithium ion battery comprising a battery housing as described above.

The utility model has the beneficial effects that:

The utility model provides a battery shell, which comprises a shell, a top cover and a flow dividing plate. The containing cavity on the shell is used for containing electrolyte in the lithium ion battery and the positive electrode pole piece and the negative electrode pole piece. The top cover is used for sealing the opening of the shell, and the liquid injection port is formed in the top cover so as to facilitate the injection of electrolyte from the liquid injection port into the accommodating cavity. Through setting up the flow distribution plate in the one end that the holding chamber is close to the top cap to set up the flow distribution plate relatively with annotating the liquid mouth, when so that pour into a mould electrolyte from annotating liquid mouth department, electrolyte can pass through the flow distribution plate earlier, in order to reduce the kinetic energy of electrolyte through the resistance of flow distribution plate to electrolyte, thereby reduce the impact force that flowing electrolyte is used on the battery core package, and then prevent that the pole piece from causing the damage because of the impact of electrolyte, influence battery performance. Through the structure, the impact force to the battery core pack when electrolyte is injected is reduced, so that the damage to the pole piece is avoided, and the influence on the battery performance is reduced.

Drawings

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

Fig. 2 is a schematic structural view of a flow dividing plate in a battery case according to an embodiment of the present utility model;

FIG. 3 is a side view of a diverter plate in a battery housing according to one embodiment of the present utility model;

fig. 4 is a schematic structural view of a housing in a battery case according to an embodiment of the present utility model;

Fig. 5 is a top view of a housing in a battery case according to an embodiment of the present utility model;

fig. 6 is a side view of a housing in a battery case according to an embodiment of the present utility model.

Reference numerals:

A housing 100; a receiving chamber 110; a splitter plate 200; a buffer section 210; a diversion hole 221; a connection part 220; a clamping plate 300; and a clamping groove 310.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, 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 at least one 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 connected, detachably connected, or integrally formed; can be mechanically or electrically connected; 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.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1 to 6, an embodiment of the present utility model provides a battery case, which includes a housing 100, a top cover, and a flow dividing plate 200, the housing 100 being configured with a receiving chamber 110 having one end opened; the top cover is covered at the opening of the shell 100, and is provided with a liquid injection port; the splitter plate 200 is disposed in the accommodating cavity 110 and near one end of the top cover, the splitter plate 200 is connected with the side wall of the accommodating cavity 110, the splitter plate 200 is disposed opposite to the liquid injection port, and the projection of the liquid injection port in the vertical direction is disposed in the splitter plate 200.

The battery case provided by the technical scheme comprises a shell 100, a top cover and a flow dividing plate 200. The accommodating cavity 110 on the housing 100 is used for accommodating electrolyte and positive and negative electrode pieces in the lithium ion battery. The top cover is used for sealing the opening of the casing 100, and the electrolyte is conveniently injected into the accommodating cavity 110 from the electrolyte injection port by arranging the electrolyte injection port on the top cover. Through setting up the flow distribution plate 200 in the one end that holding chamber 110 is close to the top cap to set up flow distribution plate 200 and annotate the liquid mouth relatively, so that when pouring electrolyte from annotating liquid mouth department, electrolyte can pass through flow distribution plate 200 earlier, in order to reduce the kinetic energy of electrolyte through the resistance of flow distribution plate 200 to electrolyte, thereby reduce the impact force that flowing electrolyte acted on the battery core package, and then prevent that the pole piece from causing the damage because of the impact of electrolyte, influence battery performance. Through the structure, the impact force to the battery core pack when electrolyte is injected is reduced, so that the damage to the pole piece is avoided, and the influence on the battery performance is reduced.

It is understood that the housing 100 may be any of a rectangular parallelepiped, a square, a cylinder, etc. In the present utility model, the case 100 is exemplified as a rectangular parallelepiped structure. The housing 100 may be one of a plastic housing, a steel housing, and an aluminum housing, and in this embodiment, the housing 100 is an aluminum housing. The top cover is arranged at the cavity mouth end of the shell 100, and is fixedly connected with the shell 100 through laser welding. The liquid filling port is used for filling electrolyte into the accommodating cavity 110 of the outer shell 100 after the top cover is welded with the outer shell 100, and then the sealing plug is sealed by adopting laser welding.

The structure of the flow dividing plate 200 is not limited, and the flow dividing plate 200 may be provided in a flat plate-like structure, may be provided in a curved surface structure, may be circular, or may be rectangular. Taking the case 100 as an example of a rectangular structure, the liquid injection port is disposed at the middle part of the top cover, and two ends of the flow dividing plate 200 are fixedly connected with two inner side walls along the width direction of the case 100, respectively. The flow dividing plate 200 is disposed opposite to the liquid injection port, so that the electrolyte injected from the liquid injection port firstly impacts on the flow dividing plate 200 to reduce the impact force of the electrolyte, and then flows into the accommodating cavity 110 along the length direction of the housing 100 under the acting force of the flow dividing plate 200 and the side wall of the accommodating cavity 110. The two ends of the splitter plate 200 can be fixedly connected with the housing 100 in a welding mode, can be fixedly connected with the housing 100 in a buckling mode, and can be fixedly connected with the housing 100 in an interference fit or clamping mode.

Specifically, as shown in fig. 2 and 3, the flow dividing plate 200 includes a buffer portion 210 and two connection portions 220, the buffer portion 210 being disposed opposite to the liquid injection port; the two connecting portions 220 are respectively connected to two ends of the buffer portion 210, and the two connecting portions 220 are respectively connected to two opposite sidewalls of the accommodating cavity 110. In this embodiment, the buffer portion 210 is disposed opposite to the liquid injection port to block the electrolyte, and further buffer the impact of the electrolyte on the battery cell, thereby preventing the pole piece from being damaged, and improving the battery performance. The buffer portion 210 is provided in a flat plate-like structure, but may be positioned in a curved surface in other embodiments. The connection of the buffer part 210 with the housing 100 is accomplished by connecting the connection parts 220 at both ends of the buffer part 210 and then connecting the two sidewalls opposite to the receiving chamber 110 through the connection parts 220. Further, the buffer portion 210 and the two connecting portions 220 form a U-shaped structure.

In one embodiment, as shown in fig. 2, a plurality of flow dividing holes 221 are provided on the buffer portion 210 at intervals, and the flow dividing holes 221 penetrate the buffer portion 210 along the thickness direction of the buffer portion 210. By providing the plurality of flow dividing holes 221 at intervals on the buffer portion 210, so that the electrolyte impacting on the buffer portion 210 can flow into the accommodating cavity 110 through the flow dividing holes 221, the impact performance of the electrolyte on the battery core can be further reduced through the flow dividing holes 221, and meanwhile, the infiltration performance of the electrode plates near the flow dividing plate 200 and the electrolyte can be ensured, so that the performance of the battery is improved.

The shape of the diversion hole 221 may be a circular hole, a rectangular hole, a square hole, a diamond hole, or the like, but may be a plurality of shapes. The diverting holes 221 are distributed in an array form on the buffer portion 210, and a distance between the diverting holes 221 near the two connection portions 220 and a plane in which the connection portions 220 are located is between 1.5mm and 5.0 mm. The distance between the diverting holes 221 and the connecting portion 220 is not easily too short, so as to ensure the structural strength of the buffer portion 210 at the position of the connecting portion 220 where the connecting portion 220 is connected. Of course, the distance of the diverting plate 200 from the connecting part 220 is not easily too long to ensure that the number of diverting holes 221 is sufficiently large to ensure the buffering effect. As a preferred embodiment, the distance between the diverting holes 221 and the plane of the connecting part 220 is between 2.5-3.5 mm. The area of the cross section of the single flow dividing hole 221 is between 1mm ²-5mm², that is, the cross section area of the flow dividing hole 221 is not too small, and the electrolyte is not easy to flow out from the flow dividing hole 221 due to too small, so that the infiltration performance of the pole piece near the flow dividing plate 200 with the electrolyte cannot be ensured; of course, the cross-sectional area of the tap hole 221 should not be too large, which would reduce the cushioning performance of the tap hole 221. Therefore, the area of the split cross section is set between 1mm ²-5mm², so that the wettability between the pole piece and the electrolyte can be ensured, and the buffer performance of the split hole 221 on the electrolyte side can be ensured.

In one embodiment, the distance between the side of the buffer 210 facing the top cover and the end face of the housing 100 where the opening is located is between 5mm and 10 mm. Since the structural members such as the tab, the switching piece, etc. are provided at the open end of the housing 100, and the top cover is further provided at the opening of the housing 100, welding of the structural members such as the tab, the switching piece, the top cover, etc. is considered. Therefore, in the present embodiment, the distance between the side of the buffer portion 210 facing the top cover and the end surface of the case 100 where the opening is located is set to be between 5mm and 10mm to reserve a space for welding of the above members, thereby securing stability of the battery performance. Of course, the distance between the buffer portion 210 and the top cover is not too long, and the buffer performance of the buffer portion 210 to the electrolyte cannot be ensured.

As shown in fig. 2 and 3, in one embodiment, the width of the manifold 200 ranges between 20mm and 40 mm. The width of the clamping plate 300 is not too wide, which would cause the clamping plate 300 to interfere with the electrode sheet, thereby causing the electrode sheet to deform; the width of the clamping plate 300 is not too narrow, which would reduce the impact performance on the electrolyte. It is therefore preferable to set the width of the card 300 between 20mm and 40 mm.

As shown in fig. 4 to 6, in one embodiment, two opposite side walls of the accommodating cavity 110 are each configured with a clamping groove 310, and two ends of the splitter plate 200 are clamped in the clamping grooves 310. Through set up joint groove 310 in the opposite both sides of holding chamber 110 to realize the joint of flow distribution plate 200 and joint groove 310, thereby make the installation of flow distribution plate 200 and shell 100 more convenient, thereby improve the assembly effect, reduction in production cost. Specifically, the connection portion 220 in the flow dividing plate 200 is engaged with the engagement groove 310.

In one embodiment, a protrusion protruding away from the sidewall is configured on the sidewall of the accommodating cavity 110, and the clamping groove 310 is clamped on the protrusion. By providing the protruding portion on the side wall of the accommodating cavity 110, the clamping groove 310 for clamping with the connecting portion 220 is formed on the protruding portion, so that the wall thickness of the housing 100 is thinner, thereby saving materials and reducing cost.

As shown in fig. 4 to 6, in another embodiment, the battery housing further includes a clamping plate 300, two ends of the clamping plate 300 along the length direction are bent towards a direction close to the side wall of the accommodating cavity 110 and are fixedly connected with the side wall of the accommodating cavity 110, and a middle section of the clamping plate 300 is spaced from the side wall of the accommodating cavity 110, so that two ends and the middle section of the clamping plate 300 enclose with the side wall of the accommodating cavity 110 to define a clamping groove 310. Through such structural style, make the mode of formation of joint groove 310 simpler for battery case is convenient for process. Specifically, the clamping plate 300 is made of an aluminum alloy the same as that of the housing 100, the clamping plate 300 is configured into a U-shaped structure, and two free ends of the clamping plate 300 are welded and fixed to corresponding side walls of the accommodating cavity 110. The clamping plate 300 and the side wall of the accommodating cavity 110 enclose to form the clamping groove 310, so that the connecting portion 220 of the splitter plate 200 is clamped with the clamping groove 310, and further the fixed connection between the splitter plate 200 and the housing 100 is realized.

Further, the thickness of the clamping plate 300 is not less than 0.5mm to ensure the strength of the clamping plate 300, thereby ensuring the connection strength of the flow dividing plate 200 and the housing 100. The width of the clamping plate 300 is not less than 1mm to ensure the effective distance between the clamping groove 310 and the connection part 220, thereby ensuring the stability of the splitter plate 200 after being clamped with the clamping groove 310. The thickness of the flow dividing plate 200 is set at about 1mm, and the gap between the middle section of the clamping plate 300 and the side wall of the accommodating groove is set at 1mm or less than 1mm, so that the connection part 220 can be clamped into the clamping groove 310.

In one embodiment, the manifold 200 is made of a temperature resistant and insulating material. So set up to prevent that flow distribution plate 200 from taking place the short circuit phenomenon after because of the thermal deformation, can prevent flow distribution plate 200 and positive and negative electrode tab contact simultaneously, and then guarantee the reliability of battery performance.

The embodiment of the utility model also provides a lithium ion battery, which comprises the battery shell. The battery shell is practically used in the lithium ion battery, so that the impact force on a battery core pack when electrolyte is injected is reduced, the damage to a pole piece is avoided, and the influence on the battery performance is reduced.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A battery case, the battery case comprising:

a housing configured with a receiving chamber having one end opened;

the top cover is covered at the opening of the shell, and a liquid injection port is formed in the top cover;

The flow dividing plate is arranged in the accommodating cavity and is close to one end of the top cover, the flow dividing plate is connected with the side wall of the accommodating cavity, the flow dividing plate is arranged opposite to the liquid injection port, and the projection of the liquid injection port in the vertical direction is positioned in the flow dividing plate.

2. The battery housing of claim 1, wherein the flow splitter plate comprises:

the buffer part is arranged opposite to the liquid injection port;

and the two connecting parts are connected to the two ends of the buffer part, and the two connecting parts are respectively connected with the two opposite side walls of the accommodating cavity.

3. The battery case according to claim 2, wherein the buffer portion is provided with a plurality of flow dividing holes at intervals, the flow dividing holes penetrating the buffer portion in a thickness direction of the buffer portion.

4. The battery case according to claim 2, wherein a distance between a side of the buffer portion facing the top cover and an end face of the case where the opening is located is between 5mm and 10 mm.

5. The battery housing of claim 1, wherein the width of the diverter plate ranges between 20mm and 40 mm.

6. The battery case according to claim 1, wherein two opposite side walls of the accommodating cavity are respectively provided with a clamping groove, and two ends of the flow dividing plate are clamped in the clamping grooves.

7. The battery case according to claim 6, wherein a protrusion protruding in a direction away from the side wall is formed on the side wall of the accommodation chamber, and the engaging groove is engaged with the protrusion.

8. The battery housing of claim 6, wherein the battery housing further comprises:

The clamping plate is bent along the two ends of the length direction towards the direction close to the side wall of the accommodating cavity and fixedly connected with the side wall of the accommodating cavity, and the middle section of the clamping plate is spaced from the side wall of the accommodating cavity, so that the two ends and the middle section of the clamping plate are enclosed with the side wall of the accommodating cavity to define the clamping groove.

9. The battery housing of any one of claims 1-8, wherein the manifold is a temperature resistant and insulating material.

10. A lithium ion battery, characterized in that it comprises a battery casing according to any one of claims 1-9.