CN214176112U

CN214176112U - Power battery top cap and power battery

Info

Publication number: CN214176112U
Application number: CN202120198500.6U
Authority: CN
Inventors: 励建炬; 邱宜升; 吴林峰
Original assignee: Shenzhen Kedali Industry Co ltd
Current assignee: Shenzhen Kedali Industry Co ltd; Shenzhen Kedali Ind Co Ltd
Priority date: 2021-01-25
Filing date: 2021-01-25
Publication date: 2021-09-10
Anticipated expiration: 2031-01-25

Abstract

The utility model discloses a power battery top cap and power battery belongs to battery technical field. The power battery top cover comprises a cover body and an insulating part arranged on the inner side of the cover body; the power battery top cover further comprises a heat conducting piece, the heat conducting piece penetrates through the insulating piece and is in contact with the cover body, so that heat inside the power battery is transmitted to the cover body through the heat conducting piece and is dissipated to the outside. The power battery comprises a battery main body and a power battery top cover, wherein the power battery top cover is arranged at the top of the battery main body to seal the battery main body. The utility model provides a better power battery top cap of heat dispersion and power battery.

Description

Power battery top cap and power battery

Technical Field

The utility model relates to a battery technology field especially relates to a power battery top cap and power battery.

Background

The power battery is a power supply for providing a power source for tools, and is a storage battery for providing power for electric automobiles, electric trains, electric bicycles and the like. When the power battery works, chemical reaction can be generated inside the battery, the chemical reaction can generate heat, the internal temperature of the battery is higher, and if the heat is not dissipated timely, the battery can be damaged. Generally, a plastic part is welded or assembled below a top cover of the power battery to perform insulation and protection, the plastic part is poor in heat conductivity, once the battery heat is out of control, the heat cannot be timely removed, and the power battery is overheated to catch fire and explode.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a better power battery top cap of heat dispersion and power battery.

To achieve the purpose, the utility model adopts the following technical proposal:

a power battery top cover comprises a cover body and an insulating part arranged on the inner side of the cover body; the power battery top cover further comprises a heat conducting piece, the heat conducting piece penetrates through the insulating piece and is in contact with the cover body, so that heat inside the power battery is transmitted to the cover body through the heat conducting piece and is dissipated to the outside.

As an alternative to the above power battery top cover, the heat conducting member is integrally formed with or fixedly connected to the insulating member.

As an alternative to the above power battery top cover, the inside of the cover body is provided with a receiving groove for receiving the heat conducting member.

As an alternative of the above power battery top cover, the groove wall of the accommodating groove is an inclined surface.

As an alternative of the power battery top cover, a clamping groove is formed in the heat conducting piece, and the insulating piece is clamped into the clamping groove.

As an alternative to the above power cell top cover, the thermally conductive member is SiC, diamond, Si, AIN, GAP, or GaAs.

As an alternative to the above power battery top cover, the heat conducting member is flat, square, circular, racetrack or diamond.

As an alternative to the above power battery top cover, a ratio of a length of the heat-conducting member to a length of the insulating member in a length direction of the insulating member is 0.01 to 1;

the ratio of the width of the heat-conducting member to the width of the insulating member in the width direction of the insulating member is 0.01 to 1.

As an alternative to the above power cell top cover, the power cell top cover further comprises an explosion-proof valve assembly and an electrode assembly provided on the cover body.

A power battery comprises a battery main body and a power battery top cover, wherein the power battery top cover is arranged at the top of the battery main body to seal the battery main body.

The utility model discloses an useful part lies in: the heat conducting piece penetrates through the insulating piece and is in contact with the cover body above the insulating piece, so that heat inside the battery can be conducted to the cover body, the heat in the battery can be timely discharged, the heat dissipation performance of the battery is improved, and the safety of the battery in the using process is ensured; in addition, the structure is simple, and the cost is lower.

Drawings

Fig. 1 is a schematic perspective view of a top cover of a power battery of the present invention;

FIG. 2 is a schematic view of the top cover of the power battery of FIG. 1 from another perspective according to the present invention;

FIG. 3 is a schematic diagram of an exploded view of the top cover of the power battery of FIG. 1 according to the present invention;

FIG. 4 is a schematic view of the structure of FIG. 2 from another perspective in accordance with the present invention;

FIG. 5 is a schematic bottom view of the top cover of the power battery of FIG. 1 according to the present invention;

FIG. 6 is a schematic structural view of a cross section A-A of the power battery top cover shown in FIG. 5 according to the present invention;

fig. 7 is an enlarged schematic view of a portion B of fig. 6 according to the present invention.

In the figure:

100. a power battery top cover; 110. a cover body; 111. accommodating grooves; 120. an explosion-proof valve assembly; 130. an electrode assembly; 140. an insulating member; 141. a pin welding position; 142. a venting structure; 150. a heat conductive member; 151. a clamping groove.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The meaning of the above terms in the present invention can be understood by those of ordinary skill in the art as the case may be.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "above" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature "under" a second feature includes a first feature that is directly under and obliquely under the second feature, or that simply means that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

The utility model provides a power battery top cap, as shown in fig. 1 to 6, power battery top cap 100 includes lid 110, explosion-proof valve subassembly 120, electrode subassembly 130, insulating part 140 and heat-conducting part 150. The cover 110 is generally made of metal, the explosion-proof valve assembly 120 and the electrode assembly 130 are disposed on the cover 110, the electrode assembly 130 is used for connecting tabs inside the battery, and electric energy is led out to the electrodes, so that the explosion-proof valve assembly 120 can be broken when the battery is out of control due to thermal runaway, and the danger of explosion and the like can be avoided. The insulating member 140 is made of plastic and disposed inside the cover 110 to insulate regions of the cover 110 except for a region corresponding to the electrode assembly 130. Since the insulating member 140 is made of plastic material and has poor heat conductivity, the heat inside the battery cannot be dissipated in time, so that the temperature inside the battery is high, and the battery fails or even explodes.

The utility model discloses in, wear to establish heat-conducting piece 150 on insulating part 140, heat-conducting piece 150 and lid 110 contact, so that heat-conducting piece 150 gives off the outside on transmitting lid 110 with the inside heat of power battery, lid 110 is the metalwork, heat dispersion is better, the heat transmits the back on lid 110 through heat-conducting piece 150, can be faster give off external environment, go up and dispel the heat through setting up heat-conducting piece 150 with the inside heat transmission of battery to lid 110, not only show the heat dispersion that has promoted the battery, and simple structure, low cost, it is also more convenient to install.

The heat conductive member 150 may be integrally formed on the insulating member 140 by injection molding, so that the heat conductive member 150 and the insulating member 140 are integrally formed without increasing the number of parts and assembling steps at all. Of course, the thermal conductor 150 may be fixed to the insulating member 140 by a fastener, for example, a screw. The present invention preferably integrates the heat conducting member 150 and the insulating member 140.

The thermal conductive member 150 may be made of any insulating block material with high thermal conductivity, such as SiC, diamond, Si, AIN, GAP, GaAs, etc., and the thermal conductive member 150 may be made of insulating thermal conductive paste.

In order to improve the heat conduction effect of the heat conduction member 150 and make the heat conduction member 150 have a larger heat conduction area, it is preferable that the heat conduction member 150 is a flat plate, for example, a rectangular plate, one side of the heat conduction member 150 contacts with the cover 110, and the other side of the heat conduction member 150 extends into the lower side of the insulation member 140 or is flush with the insulation member 140, so that the heat conduction member 150 contacts with the air flow inside the battery to conduct heat. Of course, the heat conducting member 150 may be a block or a strip, and may also be a square, a circle, a racetrack, a diamond, etc., as long as it can transfer the heat in the battery to the cover 110, which is not limited herein.

As shown in fig. 5, the insulating member 140 is provided at both ends thereof with pin welding sites 141, the pin welding sites 141 being through holes provided at both ends of the insulating member 140, the pin welding sites 141 being provided so that tabs within the battery can be welded to the electrode assembly 130. A vent structure 142 for venting the explosion-proof valve assembly 120 is provided at an intermediate position of the insulating member 140, and a heat conductive member 150 is provided between the pin welding position 141 and the vent structure 142. The heat-conducting member 150 may be provided in only one or a plurality thereof. As shown in fig. 5, the heat conduction member 150 is disposed between only one of the avoiding holes 141 and the venting structure 142, and in other embodiments, the heat conduction member 150 may be disposed between the other avoiding hole 141 and the venting structure 142.

Referring to fig. 5, the ratio of the length D1 of the heat-conducting member 150 to the length L1 of the insulating member 140 along the length direction of the insulating member 140 is 0.01 to 1, preferably 0.1 to 0.25, which can ensure that the heat-conducting member 150 does not affect the disposition of the explosion-proof valve assembly 120 and the electrode assembly 130, and the heat-conducting member 150 has a longer length and better heat-conducting effect. With continued reference to fig. 5, the ratio of the width D1 of the thermal conductor 150 to the width D2 degrees of the insulating member 140 along the width direction of the insulating member 140 is 0.01 to 1, preferably 0.3 to 0.7.

Referring to fig. 4, the inner side of the cover 110 is provided with a receiving groove 111 for receiving the heat conducting member 150, such that a portion of the heat conducting member 150 is embedded in the cover 110, and the assembly of the cover 110 and the insulating member 140 is not interfered even if the heat conducting member 150 has a certain thickness, and the thickness parameter and the structural shape of the cover 110 and the insulating member 140 are not modified to adapt to the assembly. The shape of the receiving groove 111 follows the shape of the heat-conducting member 150, for example, the heat-conducting member 150 is rectangular, and the receiving groove 111 is also rectangular.

Referring to fig. 6, the groove wall of the accommodating groove 111 is an inclined surface, the inclined surface forms an included angle a with the side wall of the heat conducting member 150, and the groove wall of the accommodating groove 111 is an inclined surface such that the notch of the accommodating groove 111 is larger and the groove bottom is smaller. The inclined surface can guide the heat-conducting member 150 on the one hand, and on the other hand, the heat-conducting member 150 is clamped more tightly after being clamped into the accommodating groove 111, so that the contact is tighter, and the heat transfer effect is improved.

Referring to fig. 6, the heat conducting member 150 is provided with a locking groove 151, and the insulating member 140 is locked in the locking groove 151, so that the assembly reliability between the heat conducting member 150 and the insulating member 140 is high, and the heat conducting member 150 is not easy to fall off from the insulating member 140.

The plastic part is welded on the cover body 110 through ultrasonic welding, the pressing block is additionally arranged on the ultrasonic jig, the heat conducting part 150 is extruded while ultrasonic, the heat conducting part 150 is pressed into the accommodating groove 111, and the inclined surface of the side wall of the accommodating groove 111 is fixedly clamped with the heat conducting part 150.

The utility model also provides a power battery, power battery include battery main part and above-mentioned power battery top cap 100, and power battery top cap 100 locates battery main part's top to seal battery main part. The tabs in the cell body are connected to the electrode assembly 130 of the power cell top cover 100.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The top cover of the power battery is characterized by comprising a cover body (110) and an insulating piece (140) arranged on the inner side of the cover body (110); the power battery top cover further comprises a heat conducting piece (150), the heat conducting piece (150) penetrates through the insulating piece (140), and the heat conducting piece (150) is in contact with the cover body (110), so that the heat conducting piece (150) can transfer heat inside the power battery to the cover body (110) to be dissipated to the outside.

2. The power cell header as recited in claim 1, wherein the heat conducting member (150) is integrally formed or fixedly attached to the insulating member (140).

3. The top cover of power battery according to claim 1, characterized in that the inside of the cover body (110) is provided with a receiving groove (111) for receiving the heat-conducting member (150).

4. The top cover of power battery as claimed in claim 3, wherein the groove wall of the accommodating groove (111) is an inclined surface.

5. The power battery top cover according to claim 1, wherein a clamping groove (151) is formed in the heat conducting member (150), and the insulating member (140) is clamped in the clamping groove (151).

6. The power cell top cover according to claim 1, wherein the thermally conductive member (150) is SiC, diamond, Si, AIN, GAP, or GaAs.

7. The power battery cap of claim 1, wherein the thermal conductor member (150) is flat, square, circular, racetrack, or diamond shaped.

8. The power cell top cover according to claim 1, wherein a ratio of a length of the heat-conducting member (150) to a length of the insulating member (140) in a length direction of the insulating member (140) is 0.01 to 1;

the ratio of the width of the heat-conducting member (150) to the width of the insulating member (140) in the width direction of the insulating member (140) is 0.1 to 1.

9. The power cell top cover according to claim 1, further comprising an explosion-proof valve assembly (120) and an electrode assembly (130) disposed on the cover (110).

10. A power battery, comprising a battery main body, and further comprising the power battery top cover as claimed in any one of claims 1 to 9, wherein the power battery top cover is disposed on the top of the battery main body to close the battery main body.