CN217562659U - Battery shell and battery - Google Patents

Abstract

The utility model belongs to the technical field of the battery, especially, relate to a battery case and battery. The battery shell comprises a radiating pipe, a cover plate and a shell provided with an inner space; the shell comprises a bottom plate and a surrounding plate connected with the bottom plate, the bottom plate is provided with a mounting hole, the outer end of the radiating tube is welded with the mounting hole, and the inner end of the radiating tube extends into the inner space; the cover plate is sealed and covered on the coaming. The utility model discloses in, be equipped with the through-hole on the electricity core, the cooling tube inserts in the through-hole, at the in-process of electricity core work, the inside of electricity core can be followed to the cooling tube and the technical effect of cooling is played to the electricity core to the heat-sinking capability of electricity core has been improved.

Description

Battery shell and battery

Technical Field

The utility model belongs to the technical field of the battery, especially, relate to a battery case and battery.

Background

With the increasing shortage of global mineral energy, the rising price of petroleum and the increasing environmental pollution, the demand of people for clean and renewable energy is more and more urgent. As a high-efficiency renewable energy carrier, lithium ion batteries have been widely used in the communications and electronics industries, especially in personal communication tools such as mobile phones and tablets. In recent two years, with the rapid development of communication technology, color screen technology, multimedia message technology, bluetooth technology and camera technology of mobile phones are continuously developed, and higher requirements are put forward on indexes such as capacity, volume, weight, electrochemical performance and safety of lithium ion batteries.

The safety of the lithium ion battery is particularly important in the fields requiring large capacity and high power, such as the application fields of electric vehicles, communication equipment and the like. The important factors influencing the safety of the lithium ion battery are that the heat generated by the battery in a working state cannot be removed in time or even gradually accumulated, and finally, explosion and fire accidents are caused by thermal runaway, so that harm and loss are brought to customers.

In the prior art, in order to increase the heat dissipation capability of the battery, a heat sink is usually added in the battery pack, and the heat of the battery is absorbed from the outside by using a cooling liquid passing through the heat sink. However, such heat dissipation effect of dissipating heat from the outside to the battery is limited.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the limited technical problem of radiating effect of battery is given to the extroversion among the prior art, a battery case and battery are provided.

In view of the above technical problems, an embodiment of the present invention provides a battery case, which includes a heat dissipation tube, a cover plate, and a case having an inner space; the shell comprises a bottom plate and a surrounding plate connected with the bottom plate, the bottom plate is provided with a mounting hole, the outer end of the radiating tube is welded with the mounting hole, and the inner end of the radiating tube extends into the inner space; the cover plate is sealed and covered on the coaming.

Optionally, the cooling tube is one end open-ended heat dissipation blind pipe, be equipped with heat dissipation cavity and intercommunication on the heat dissipation blind pipe the opening of heat dissipation cavity, be equipped with first weld part on the opening part of heat dissipation blind pipe, the week of mounting hole is followed and is equipped with the second weld part, the heat dissipation blind pipe is through mutual welded first weld part with the welding of second weld part is in the mounting hole.

Optionally, the inner surface of the heat dissipation cavity is plated with a heat transfer graphite film, or the inner surface of the heat dissipation cavity is attached with a heat transfer graphite tube.

Optionally, the battery case further comprises an external heat dissipation member for transferring heat of the heat transfer graphite film or the heat transfer graphite tube to the external environment, and the external heat dissipation member is connected with the heat transfer graphite film or the heat transfer graphite tube.

Optionally, the cooling tube is the solid pipe, the outer end of solid pipe is equipped with first weld part, the week edge of mounting hole is equipped with the second weld part, the solid pipe is through mutual welded first weld part with the welding of second weld part is in the mounting hole.

Optionally, the cooling tube is closed hollow heat pipe, closed hollow heat pipe's outer end is equipped with first weld part, the week of mounting hole is followed and is equipped with the second weld part, closed hollow heat pipe is through mutual welded first weld part with the welding of second weld part is in the mounting hole.

Optionally, the inner cavity of the closed hollow heat pipe is filled with coolant.

Optionally, the enclosed hollow heat pipe includes an internal connection portion and an external connection portion connected to the internal connection portion, the external connection portion is welded to the mounting hole, and the external connection portion is located outside the internal space;

the heat dissipation structure is characterized in that a first heat dissipation cavity is arranged on the inner connecting portion, and a second heat dissipation cavity communicated with the first heat dissipation cavity is arranged on the outer connecting portion.

Optionally, the battery case further includes a heat dissipation welding part, and the external connection part is welded and transfers heat through the heat dissipation welding part; and the heat dissipation welding piece is welded on the peripheral edge of the mounting hole of the bottom plate.

Another embodiment of the utility model provides a battery, include foretell battery case and all be located electric core and electrolyte in the inner space, be equipped with the through-hole on the electric core, electric core is through inserting the through-hole the cooling tube is installed in the inner space.

In the utility model, the shell is provided with an inner space for installing the battery cell; the cover plate is covered on the shell and used for sealing the inner space; the bottom plate is provided with a mounting hole, the outer end of the radiating pipe is welded with the mounting hole, and the inner end of the radiating pipe extends into the inner space; at the in-process of electric core work, the cooling tube can be given from the inside of electric core the effect of cooling is played to the electric core to the heat-sinking capability of electric core has been improved. In addition, the outer end of the radiating pipe is welded with the mounting hole, so that the assembly process and the manufacturing cost of the battery shell are reduced, the assembly benefit is improved, and the battery shell is easier to manufacture and implement in the industry.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of a battery case according to a first embodiment of the present invention;

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

fig. 3 is a sectional view of a battery case according to a second embodiment of the present invention;

fig. 4 is a cross-sectional view of a battery case provided by a third embodiment of the present invention;

fig. 5 is an exploded view schematically illustrating a battery according to a fourth embodiment of the present invention;

fig. 6 is a schematic structural diagram of a battery according to a fourth embodiment of the present invention;

fig. 7 is a cross-sectional view of a battery according to a fourth embodiment of the present invention;

fig. 8 is a schematic diagram of the winding type battery cell of the present invention.

The reference numerals in the specification are as follows:

1. a radiating pipe; 11. a heat dissipation blind pipe; 111. a heat dissipation cavity; 112. an opening; 12. an external heat sink; 13. a closed hollow heat pipe; 131. an inner connection part; 1311. a first heat dissipation cavity; 132. an external connection part; 1321. a second heat dissipation cavity; 14. a heat dissipation welding part; 15. a solid tube; 16. a heat transfer graphite film; 2. a cover plate; 3. a housing; 31. an interior space; 32. a base plate; 321. mounting holes; 33. enclosing plates; 4. an electric core; 41. and a through hole.

Detailed Description

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

It is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", "middle", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing and simplifying the present invention, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 to 5, a battery casing according to an embodiment of the present invention includes a heat dissipating pipe 1, a cover plate 2, and a housing 3 having an inner space 31; the outer shell 3 comprises a bottom plate 32 and a surrounding plate 33 connected with the bottom plate 32, the bottom plate 32 is provided with a mounting hole 321, the outer end of the radiating pipe 1 is welded (end face welding, ultrasonic welding, resistance welding and the like) with the mounting hole 321, and the inner end of the radiating pipe 1 extends into the inner space 31; the cover plate 2 is sealed and covered on the enclosing plate 33. In a specific embodiment, the cover plate 2 is provided with a positive terminal, and the bottom plate 32 is provided with a negative terminal; in another embodiment, a negative terminal is disposed on the cover plate 2, and a positive terminal is disposed on the bottom plate 32; the positive terminal is connected to the positive tab of the battery cell 4 located in the internal space 31, and the negative terminal is connected to the negative tab of the battery cell 4 located in the internal space 31. In addition, the outer end of the radiating pipe 1 is the end of the radiating pipe 1 facing the bottom plate 32, and the inner end of the radiating pipe 1 is the end of the radiating pipe 1 facing the cover plate 2; the heat dissipation pipe 1 may be a solid structural member, for example, the heat dissipation pipe 1 has a function of cooling the battery cell 4 in the internal space 31; the heat dissipation pipe 1 may also be a hollow pipe provided with a heat dissipation space, and the heat of the battery cell 4 in the internal space 31 is dissipated through the air in the heat dissipation pipe 1.

Further, the outer wall of the radiating pipe 1 may be welded to the inner wall of the mounting hole 321, and the end of the radiating pipe 1 may be welded to the upper surface of the mounting hole 321, as long as it is ensured that the radiating pipe 1 is disposed opposite to the mounting hole 321. The bottom plate 32 and the enclosing plate 33 may be formed as an integral structure, and a predetermined space is reserved between one end of the radiating pipe 1 away from the bottom plate 32 and the cover plate 2, and the predetermined space can be used for arranging related components such as a safety valve, an explosion-proof valve, and the like. And the housing 3 and the cap plate 2 may be made of conventional steel or aluminum, so that the battery is a steel-can battery or an aluminum-can battery.

In the utility model, the shell 3 is provided with an inner space 31 for installing the battery cell 4; the cover plate 2 is covered on the shell 3, and the cover plate 2 is used for sealing the inner space 31; the bottom plate 32 is provided with mounting holes 321, the outer ends of the radiating pipe 1 are welded to the mounting holes 321, and the inner ends of the radiating pipe 1 extend into the inner space 31; in the working process of the battery cell 4, the heat dissipation pipe 1 can cool the battery cell 4 from the inside of the battery cell 4, so that the heat dissipation capacity of the battery cell 4 is improved. In addition, the outer end of the radiating pipe 1 is welded with the mounting hole 321, so that the assembly process and the manufacturing cost of the battery shell are reduced, the assembly benefit is improved, and the battery shell is easier to manufacture and implement in the industry.

In an embodiment, as shown in fig. 1 to 3, the heat dissipation pipe 1 is a heat dissipation blind pipe 11 with an open end, the heat dissipation blind pipe 11 is provided with a heat dissipation cavity 111 and an opening 112 communicating with the heat dissipation cavity 111, a first welding portion (not shown) is provided at the opening 112 of the heat dissipation blind pipe 11, a second welding portion (not shown) is provided at the periphery of the mounting hole 321, and the heat dissipation blind pipe 11 is welded in the mounting hole 321 through the first welding portion and the second welding portion which are welded to each other. As can be understood, the inner end of the heat dissipation blind pipe 11 is of a sealing structure, and the outer end of the heat dissipation blind pipe 11 is of an opening structure; the first welding part may be disposed on the outer wall of the heat dissipation blind pipe 11, and correspondingly, the second welding part is disposed on the inner side wall of the mounting hole 321; the first welding part is arranged at the bottom of the heat dissipation blind pipe 11, and correspondingly, the second welding part is arranged on the inner wall of the bottom plate 32. In this embodiment, the heat of the battery cell 4 may be transferred to the external environment through the air, the refrigerant, and other substances in the heat dissipation cavity 111, so that the heat dissipation effect of the battery cell 4 is ensured.

In one embodiment, as shown in fig. 3, the inner surface of the heat dissipation cavity 111 is plated with a heat transfer graphite film 16, or the inner surface of the heat dissipation cavity 111 is attached with a heat transfer graphite tube (not shown). It can be understood that both the heat transfer graphite film 16 and the heat transfer graphite tube have a better heat transfer effect, and the heat of the battery cell 4 is transferred to the heat transfer graphite film 16 or the heat transfer graphite tube through the heat dissipation blind pipe 11, and then transferred to the external ring shape through the heat transfer graphite film 16 or the heat transfer graphite tube, because the heat transfer efficiency of the heat transfer graphite film 16 or the heat transfer graphite tube is better, the heat dissipation effect of the battery cell 4 is further improved.

In one embodiment, as shown in fig. 3, the battery case further includes an external heat sink 12 for transferring heat of the heat transfer graphite film 16 or the heat transfer graphite tube to the external environment, and the external heat sink 12 is connected to the heat transfer graphite film 16 or the heat transfer graphite tube. It can be understood that the external heat dissipation element 12 may be made of a copper material or the like, the external heat dissipation element 12 is located outside the internal space 31, and one end of the external heat dissipation element 12 extends into the heat dissipation cavity and contacts with the heat transfer graphite film 16 or the heat transfer graphite tube, so that the heat of the battery cell 4 is transferred to the heat transfer graphite film 16 or the heat transfer graphite tube, and then is transferred to the external heat dissipation element 12 through the heat transfer graphite film 16 or the heat transfer graphite tube, and finally is transferred to the external environment through the external heat dissipation element 12, thereby completing the heat dissipation effect of the battery cell 4.

In one embodiment, as shown in fig. 4, the radiating pipe 1 is a solid pipe 15, the outer end of the solid pipe 15 is provided with a first welding portion (not shown), the periphery of the mounting hole 321 is provided with a second welding portion (not shown), and the solid pipe 15 is welded in the mounting hole 321 through the first welding portion and the second welding portion which are welded to each other. It is understood that the first welding part is provided on the outer wall of the solid pipe 15, the second welding part is provided on the inner sidewall of the mounting hole 321, and the outer end of the radiating pipe 1 is inserted into the mounting hole 321 and welded with the inner sidewall of the mounting hole 321. In this embodiment, the heat dissipation pipe 1 is made of a heat dissipation material (copper material, graphite, etc.), so that the heat dissipation effect of the battery cell 4 is ensured.

In one embodiment, as shown in fig. 5 to 7, the heat dissipating pipe 1 is a closed hollow heat pipe 13, the outer end of the closed hollow heat pipe 13 is provided with a first welding portion (not shown), the periphery of the mounting hole 321 is provided with a second welding portion (not shown), and the closed hollow heat pipe 13 is welded in the mounting hole 321 through the first welding portion and the second welding portion which are welded to each other. Understandably, the closed hollow heat pipe 13 is composed of a pipe shell, a wick and an end cover, the inside of the closed hollow heat pipe 13 is pumped into a negative pressure state and filled with proper liquid, the liquid has a low boiling point and is easy to volatilize, the wick is arranged on the pipe wall and is made of capillary porous materials; when the inner end of the closed hollow heat pipe 13 is heated (i.e. absorbs the heat of the battery cell 4), the liquid in the capillary tube evaporates rapidly, the vapor flows to the outer end of the closed hollow heat pipe 13 under a small pressure difference and releases heat to be condensed into liquid again, and the liquid flows back to the inner end of the closed hollow heat pipe 13 along the porous material under the action of capillary force, so that the heat is transferred from the inner end to the outer end of the closed hollow heat pipe 13 without circulating. This cycle is rapid and heat can be conducted away from the cell 4, thereby dissipating heat.

In one embodiment, the inner cavity of the enclosed hollow heat pipe 13 is enclosed with a coolant (not shown). It is understood that the coolant has a low boiling point and is easily volatile.

In one embodiment, as shown in fig. 5 to 7, the enclosed hollow heat pipe 13 includes an internal connection portion 131 and an external connection portion 132 connected to the internal connection portion 131, the external connection portion 132 is welded to the mounting hole 321, and the external connection portion 132 is located outside the internal space 31; it is understood that the external connection portion 132 may be welded to an outer wall of the mounting hole 321 (i.e., an outer wall of the bottom plate 32), the internal connection portion 131 and the external connection portion 132 may be integrally formed, the internal connection portion 131 may be an elongated cylinder, the external connection portion 132 may be a disk, the internal connection portion 131 extends into the internal space 31, and the through hole 41 of the battery cell 4 is inserted into the internal connection portion 131.

The inner portion 131 is provided with a first heat dissipation cavity 1311, and the outer portion 132 is provided with a second heat dissipation cavity 1321 communicated with the first heat dissipation cavity 1311. In this embodiment, the first heat dissipation cavity 1311 is a condensation end of the closed hollow heat pipe 13, the second heat dissipation cavity 1321 is an evaporation end of the closed hollow heat pipe 13, and after the coolant absorbs heat of the battery cell 4 in the first heat dissipation cavity 1311, the coolant is transmitted to the external environment through the second heat dissipation cavity 1321, so that the heat dissipation operation of the battery cell 4 is completed. And the radiating pipe 1 is connected with the bottom plate 32 of the housing 3 through the external connection part 132, so that the convenience of assembling the battery shell is improved.

In one embodiment, as shown in fig. 5 to 7, the battery case further includes a heat dissipation weld 14, and the external connection portion 132 is welded and transfers heat by the heat dissipation weld 14; the heat sink welding member 14 is welded to the outer peripheral edge of the mounting hole 321 of the base plate 32. It is to be understood that the housing 3 is made of steel, aluminum, etc., the radiating pipe 1 is made of copper, the radiating pipe 1 and the radiating weld 14 can be welded by brazing, etc., and the radiating weld 14 and the housing 3 can be welded by ordinary welding (laser welding, friction welding, resistance welding, etc.). In this embodiment, the heat dissipation pipe 1 is connected to the bottom plate 32 through the heat dissipation welding part 14, so as to ensure the convenience of assembling the battery casing; and the heat dissipation welding piece 14 can dissipate heat of the external connection part 132, so that the heat dissipation effect of the battery cell 4 is ensured.

In one embodiment, as shown in fig. 5 to 7, a groove is formed on the heat sink welding member 14, and the external connecting portion 132 is located in the groove. It will be appreciated that the external connecting portion 132 is inserted into the groove, the upper surfaces of the heat dissipating weld members 14 and the external connecting portion 132 are flush, and the upper surfaces of the heat dissipating weld members 14 and the external connecting portion 132 are abutted against the outer surface of the bottom plate 32, so as to ensure the stability of the pipe 1 being connected to the bottom plate 32 by the heat dissipating weld members 14.

In one embodiment, as shown in fig. 1, the radiating pipe 1 and the housing 3 are both cylindrical; and the axis of the radiating pipe 1 coincides with the axis of the housing 3. It is to be understood that the housing 3 is not limited to a cylindrical shape, and may be square, etc.; the radiating pipe 1 is arranged at the center of the housing 3 (i.e., the axis of the inner connection portion 131 coincides with the axis of the housing 3), thereby ensuring the stability of the battery.

As shown in fig. 6 and fig. 7, another embodiment of the present invention further provides a battery, which includes the above-mentioned battery case, and the battery cell 4 and the electrolyte both located in the internal space 31, a through hole 41 is provided on the battery cell 4, and the battery cell 4 is installed in the internal space 31 through the heat dissipation pipe 1 inserted into the through hole 41. It is understood that batteries may be classified into lithium ion batteries, nickel cadmium batteries, nickel zinc batteries, and the like according to the types of the battery cells 4 and the electrolyte. The utility model discloses in, cooling tube 1 inserts in the through-hole 41 of electricity core 4, thereby cooling tube 1 from inside can be right electricity core 4 plays radiating effect to guarantee the radiating effect of electricity core 4, guaranteed the performance of battery, prolonged the life of battery.

In an embodiment, as shown in fig. 8, the battery cell 4 is a winding battery cell 4, and the battery cell 4 includes a positive electrode sheet, a separator, and a negative electrode sheet that are stacked; the positive pole piece is provided with a positive pole lug, and the negative pole piece is provided with a negative pole lug. It can be understood that, after the diaphragm, the positive plate, the diaphragm, the negative plate and the diaphragm are laminated together, the battery cell 4 is manufactured into a cylindrical shape by a winding process, and the middle part of the battery cell 4 is reserved for the radiating pipe 1 to be inserted into the through hole 41. After the winding of the battery cell 4 is completed, a positive tab is led out from the positive plate and is connected with the positive end; and a negative electrode lug is led out from the negative electrode piece and is connected with the negative electrode terminal. In this embodiment, when battery shell assembly electricity core 4 is used, only need be in the inside of electricity core 4 sets up the confession the cooling tube 1 penetrates through-hole 41 need not reform transform other parts of battery, also need not to carry out redesign to the battery is whole and overall arrangement, only need process on the apron 2 mounting hole 321 (through processing such as stamping process), greatly reduced the development cost of battery.

In another embodiment, one side of the positive plate is provided with a non-dressing area, the other side of the negative plate is also provided with a non-dressing area, and the non-dressing area is wound to form the positive electrode lug or the negative electrode lug.

In one embodiment, the external diameter of the radiating pipe 1 is 3mm to 10mm (e.g., 5mm, 7mm, 9mm, etc.), and the external diameter of the battery cell 4 is 20mm to 100mm (e.g., 40mm, 60mm, 80mm, etc.).

The above description is only an example of the battery case of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A battery shell is characterized by comprising a radiating pipe, a cover plate and a shell provided with an inner space; the shell comprises a bottom plate and a surrounding plate connected with the bottom plate, the bottom plate is provided with a mounting hole, the outer end of the radiating tube is welded with the mounting hole, and the inner end of the radiating tube extends into the inner space; the cover plate is sealed and covered on the coaming.

2. The battery casing according to claim 1, wherein the heat dissipation pipe is a heat dissipation blind pipe with an opening at one end, the heat dissipation blind pipe is provided with a heat dissipation cavity and an opening communicating with the heat dissipation cavity, the opening of the heat dissipation blind pipe is provided with a first welding portion, the periphery of the mounting hole is provided with a second welding portion, and the heat dissipation blind pipe is welded in the mounting hole through the first welding portion and the second welding portion which are welded to each other.

3. The battery case according to claim 2, wherein the inner surface of the heat dissipation cavity is plated with a heat transfer graphite film, or a heat transfer graphite tube is attached to the inner surface of the heat dissipation cavity.

4. The battery case according to claim 3, further comprising an external heat sink for transferring heat from the heat transfer graphite film or the heat transfer graphite tube to the external environment, the external heat sink being connected to the heat transfer graphite film or the heat transfer graphite tube.

5. The battery case as set forth in claim 1, wherein the heat dissipating pipe is a solid pipe, the outer end of the solid pipe is provided with a first welding portion, the periphery of the mounting hole is provided with a second welding portion, and the solid pipe is welded in the mounting hole by the first welding portion and the second welding portion which are welded to each other.

6. The battery case according to claim 1, wherein the heat dissipation pipe is a closed hollow heat pipe, the outer end of the closed hollow heat pipe is provided with a first welding portion, the periphery of the mounting hole is provided with a second welding portion, and the closed hollow heat pipe is welded in the mounting hole by the first welding portion and the second welding portion which are welded to each other.

7. The battery case according to claim 6, wherein the inner cavity of the closed hollow heat pipe is enclosed with a coolant.

8. The battery case according to claim 6, wherein the enclosed hollow heat pipe includes an internal connection portion and an external connection portion connected to the internal connection portion, the external connection portion being welded to the mounting hole, the external connection portion being located outside the internal space;

the heat dissipation structure is characterized in that a first heat dissipation cavity is arranged on the inner connecting portion, and a second heat dissipation cavity communicated with the first heat dissipation cavity is arranged on the outer connecting portion.

9. The battery case of claim 8, further comprising a heat sink weld, the external connection being welded and thermally transferred by the heat sink weld; and the heat dissipation welding piece is welded on the peripheral edge of the mounting hole of the bottom plate.

10. A battery comprising the battery casing of any one of claims 1 to 9, and a battery cell and an electrolyte both located in the internal space, wherein the battery cell is provided with a through hole, and the battery cell is installed in the internal space through the heat dissipation pipe inserted into the through hole.

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