CN218919098U

CN218919098U - Lower plastic part, top cover assembly, energy storage device and electric equipment

Info

Publication number: CN218919098U
Application number: CN202223049300.8U
Authority: CN
Inventors: 周文扬
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2022-11-16
Filing date: 2022-11-16
Publication date: 2023-04-25
Anticipated expiration: 2032-11-16

Abstract

The application discloses lower plastic part, top cap subassembly, energy memory and consumer. The top cap subassembly is applied to down the plastic part, and the top cap subassembly includes top cap body and explosion-proof valve, and the explosion-proof valve sets up in the top cap body, and lower plastic part includes first surface and second surface, and first surface is used for setting up in the top cap body, and the second surface sets up with first surface in opposite directions, and the protruding bellying that is equipped with of second surface, the one side that deviates from the second surface of bellying are equipped with the air vent, and the air vent link up to first surface, and the air vent is configured to be corresponding to the explosion-proof valve setting, so when the explosion-proof valve set up in the top cap body, along the thickness direction of top cap body on, the explosion-proof valve is located the air vent at least partially. By adopting the scheme of the application, the ventilation space of the ventilation hole is larger, and gas generated by the battery cell of the energy storage device can be directly guided to the explosion-proof valve in time, so that the explosion-proof valve can normally release pressure.

Description

Lower plastic part, top cover assembly, energy storage device and electric equipment

Technical Field

The application relates to the technical field of new energy, in particular to a lower plastic part, a top cover assembly, an energy storage device and electric equipment.

Background

In the use process of the battery, when the battery is used in overcharging, overdischarging, short-circuiting or severe environments (high-temperature, high-humidity and low-pressure environments), the temperature of the battery rises and generates a large amount of gas, so that the internal pressure of the battery is increased, and if the pressure is not released in time, the battery may explode. Based on this, in the related art, in order to ensure the safety of the battery, a pressure relief hole is formed in a top cover assembly of the battery, and an explosion-proof valve is disposed at the pressure relief hole, so that when the pressure inside the battery reaches a threshold value, the gas can be relieved through the explosion-proof valve, so as to reduce the risk of explosion of the battery.

However, because the lower plastic part of the top cover assembly is arranged between the explosion-proof valve and the battery core of the battery, when a large amount of gas is accumulated in the battery, the lower plastic part can obstruct the flow of the gas to the explosion-proof valve, so that the pressure cannot be released timely.

Disclosure of Invention

The embodiment of the application discloses plastic part, top cap subassembly, energy memory and consumer down, plastic part can guide gas to the explosion-proof valve flow down to effectively improve the safety in utilization of battery.

In order to achieve the above object, a first aspect, the present application discloses a lower plastic part, is applied to the top cap subassembly, the top cap subassembly includes top cap body and explosion-proof valve, explosion-proof valve set up in the top cap body, lower plastic part includes:

the first surface is used for being arranged on the top cover body;

the second surface, the second surface with the first surface sets up in opposite directions, the protruding bellying that is equipped with of second surface, the bellying deviate from the one side of second surface is equipped with the air vent, the air vent runs through the first surface, the air vent is configured to be corresponding to the explosion-proof valve sets up, in order to be in when the explosion-proof valve set up in the top cap body, along in the thickness direction of top cap body, the explosion-proof valve is located at least partially in the air vent.

Through setting up the bellying at the second surface of plastic part down, set up the air vent of penetrating down the first surface of plastic part simultaneously on the bellying, utilize this air vent can be used for corresponding explosion-proof valve setting to when the explosion-proof valve setting on the top cap body, this explosion-proof valve can be located the air vent at least partially, the ventilation space of air vent is great from this, can be fast and in time direct the gas that produces with energy memory's electric core to explosion-proof valve department for the explosion-proof valve can normally release.

In addition, the setting of bellying can also take place to expand or remove when energy memory's electric core, plays the effect of supporting spacing electric core to electric core for can form the buffer space between lower plastic part self and the electric core, avoid the circumstances that the electric core caused the damage to electric core because of mechanical vibration leads to lower plastic part collision to shake garrulous or the tab on the split electric core, play the effect of protection electric core, and then be favorable to improving energy memory's life.

As an alternative embodiment, the height of the protrusion from the second surface is h1, and the distance between the first surface and the second surface is h2, and h1/h2 is 1.5.ltoreq.h1.ltoreq.6. Because the explosion-proof valve sets up when the top cap body, it is closer to the first surface of plastic part down, consequently, set up the protruding high self thickness that is greater than plastic part down of bellying, not only can compromise energy storage device and have good energy density, but also can effectively separate plastic part self and energy storage device's electric core down, stopped electric core and the possibility that the explosion-proof valve that is arranged in the air vent took place to contact, realized fully blocking electric core and explosion-proof valve, improved energy storage device's safety in utilization. If h1/h2 is too small, the protruding part can not be used for separating the battery core from the explosion-proof valve, so that the battery core can be contacted with the explosion-proof valve, on one hand, the resistance of gas flowing to the explosion-proof valve is easily caused to be too large, the normal valve opening of the explosion-proof valve is influenced, on the other hand, the battery core and the explosion-proof valve can be contacted and shorted, and the use safety of the energy storage device is influenced. If h1/h2 is too large, the protruding height of the protruding portion is too large, the protruding portion occupies more inner space of the energy storage device, so that the inner space of the energy storage device cannot be effectively utilized, and the energy density of the energy storage device is affected.

As an alternative embodiment, the lower plastic part further comprises a first side surface and a second side surface opposite to the first side surface, and the first side surface and the second side surface are connected to the first surface and the second surface;

the protruding portion deviates from the one side of second surface is the third surface, protruding portion still include the third side with the fourth side that the third side is opposite to, the third side the fourth side connect in the third surface, the third side flushes in the first side, the fourth side flushes in the second side.

The third side and the fourth side of the protruding part are respectively flush with the first side and the second side of the lower plastic part, so that on one hand, the lower plastic part is enabled to be integrally kept flat on the first side and the second side, the lower plastic part is convenient to be connected with other parts of the energy storage device, and on the other hand, the protruding part protrudes out of the lower plastic part, so that the third side and the fourth side can be used for increasing the surface areas of the first side and the second side, the connection area of the lower plastic part and other parts of the energy storage device can be increased, and the connection reliability and connection stability of the lower plastic part and other parts of the energy storage device are improved.

As an alternative embodiment, the vent hole is a long strip hole, and the length direction of the vent hole is along the length direction of the lower plastic part. Thus, the length of the vent hole can be longer, and the vent hole is not easy to be blocked by the battery core when the protruding part is in contact with the battery core of the energy storage device, so that the vent hole can be ensured to guide gas to the explosion-proof valve.

In a second aspect, the present application also discloses a roof assembly comprising:

the top cover body is provided with a through pressure relief hole;

the explosion-proof valve is sealed in the pressure relief hole; and

the lower plastic part according to the first aspect, wherein the vent hole is communicated with the pressure relief hole along a penetrating direction of the pressure relief hole.

Like this, the air vent is in pressure release hole along pressure release control's link direction intercommunication to when the explosion-proof valve was installed in pressure release hole, the explosion-proof valve can correspond this air vent and be located this air vent at least partially, thereby more be favorable to the air vent direct guide air current to explosion-proof valve department, ensure the normal pressure release of explosion-proof valve.

As an alternative embodiment, the explosion-proof valve has a fourth surface facing the second surface of the lower plastic part, and a space is provided between the fourth surface and a surface of the protruding part facing away from the second surface in the thickness direction of the top cover body. Therefore, when the battery cell is abutted against the protruding portion, the explosion-proof valve is not easy to touch due to the fact that a gap is reserved between the explosion-proof valve and one face, away from the second surface, of the protruding portion, and accordingly, the gap is reserved between the battery cell and the explosion-proof valve in the use process of the energy storage device, and gas can be gathered towards the explosion-proof valve.

As an alternative embodiment, the surface area of the explosion-proof valve is S1, and the surface area of the surface of the top cover body provided with the pressure relief hole is S2, S1: s2=1/20-1/15. Because the vent hole on the protruding part is arranged, and the explosion-proof valve can be at least partially positioned in the vent hole, the vent hole has enough vent area, under the condition, the size of the explosion-proof valve can be properly reduced, so that the aperture of the pressure relief hole on the top cover body can be correspondingly reduced, the corresponding area of the structurally weak part of the top cover body is reduced, and the problem that the explosion-proof valve is easy to touch to cause failure due to oversized size can be reduced when the energy storage device is installed, thereby being beneficial to improving the overall structural stability of the energy storage device.

In a third aspect, the application further discloses an energy storage device, the energy storage device includes a housing, a battery cell and the top cover assembly according to the second aspect, the housing has an opening, the battery cell is accommodated in the housing, the top cover body of the top cover assembly is connected to the housing to cover the opening, the lower plastic part faces the battery cell and is arranged along the opening direction of the housing, and the protruding part is located between the explosion-proof valve and the battery cell.

Therefore, the protruding part can play a role of resisting the limiting battery cell, and the situation that the battery cell is damaged due to the fact that the battery cell touches the lower plastic part in the moving or expanding process is prevented. Meanwhile, the distance between the battery cell and the explosion-proof valve can be increased by utilizing the protruding part, so that gas can be better drained to the explosion-proof valve through the vent hole of the protruding part, and normal pressure relief is realized.

As an alternative implementation mode, the electric core includes the top and with the bottom that the top set up in opposite directions, the top is close to the opening of casing, the top has the terminal surface, along in the opening direction of casing, the explosion-proof valve is in the projection area on the terminal surface is first region, first region does not paste and establishes the insulating film. The first region is a region of the top end surface corresponding to the explosion-proof valve, and therefore, the insulating film is not attached to the first region, and the insulating film can be prevented from blocking gas, so that the gas can be collected and flows to the explosion-proof valve through the first region.

As an alternative embodiment, the region of the top surface other than the first region is a second region, and an insulating film is attached to the second region. The insulating film is all pasted in the region except for first region of terminal surface to can seal up other regions except for first region of terminal surface, make gaseous more concentrate to the first region of not pasting the insulating film and assemble more easily from this, and then be favorable to explosion-proof valve to realize the pressure release function.

As an optional implementation manner, the plurality of electric cores are sequentially arranged along the width direction of the top cover body, and an airflow channel is formed between two adjacent electric cores;

the projection of the air flow channel on the top cover body is positioned on the explosion-proof valve, and the air flow channel is communicated with the vent hole and the inside of the shell. Therefore, gas generated among the multiple battery cores can be drained by the airflow channel, so that the gas can be conveniently drained to the vent holes to be concentrated to the explosion-proof valve, and the explosion-proof valve is beneficial to realizing the pressure relief function.

In a fourth aspect, the application further discloses a powered device, including an energy storage device according to the third aspect. The electric equipment with the energy storage device of the third aspect can also achieve the beneficial effect of effectively improving the use safety of the battery.

Compared with the prior art, the beneficial effect of this application lies in:

through setting up the bellying at the second surface of plastic part down, set up the air vent of penetrating down the first surface of plastic part simultaneously on the bellying, utilize this air vent can be used for corresponding explosion-proof valve setting to when the explosion-proof valve setting on the top cap body, this explosion-proof valve can be held in the air vent at least partially, the ventilation space of air vent is great from this, can be fast and in time direct the gas that produces with energy memory's electric core to explosion-proof valve department for the explosion-proof valve can normally release.

Drawings

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

FIG. 1 is a schematic view of a lower plastic part of the present application;

FIG. 2 is a schematic diagram of another view of FIG. 1;

fig. 3 is a partial enlarged view at a in fig. 1;

FIG. 4 is a side view of the lower plastic part of the present application;

FIG. 5 is a schematic structural view of the cap assembly of the present application;

FIG. 6 is a schematic diagram of another view of FIG. 5;

FIG. 7 is a cross-sectional view of the cap assembly of the present application;

FIG. 8 is a schematic structural view of the energy storage device of the present application;

FIG. 9 is an internal cross-sectional view of the energy storage device of the present application;

fig. 10 is a schematic view of the structure of the explosion-proof valve projected on the battery cell.

Reference numerals mainly

10. A lower plastic part; 11. a first surface; 12. a second surface; 13. a first side; 14. a second side; 12a, a boss; 120. a vent hole; 120a, a first wall surface; 120b, a second wall; 120c, a third wall surface; 120d, a fourth wall surface; 121. a third surface; 122. a third side; 123. a fourth side; 124. a fifth side; 125. a sixth side; 20. a top cover assembly; 21. a top cover body; 210. a pressure relief hole; 22. an explosion-proof valve; 220. a fourth surface; 30. an energy storage device; 31. a housing; 32. a battery cell; 32a, a tip; 32b, a bottom end; 320. a top end surface; 320a, a first region; 320b, a second region; 3201. an insulating film.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The terms "mounted," "disposed," "configured," "connected," "coupled" and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.

The technical scheme of the present application will be further described with reference to examples and drawings.

Referring to fig. 1 to 4, a lower plastic member 10 is disclosed, which can be applied to a top cover assembly of an energy storage device. The energy storage device may include a battery, and may be, but is not limited to, a cylindrical battery, a prismatic battery, and the like. The top cover assembly can comprise a top cover body and an explosion-proof valve, wherein the explosion-proof valve is arranged on the top cover body to release pressure of internal gas of the energy storage device, so that safety accidents caused by explosion of the energy storage device due to incapability of releasing pressure of the gas accumulation are prevented. Specifically, the lower plastic part 10 includes a first surface 11 and a second surface 12, and the first surface 11 is configured to be disposed on the top cover body when the lower plastic part 10 is applied to the top cover assembly. The second surface 12 may be disposed opposite to the first surface 11, and the second surface 12 may be provided with a protrusion 12a. The side of the boss 12a facing away from the second surface 12 is provided with a vent hole 120, and the vent hole 120 penetrates from the boss 12a to the first surface 11, i.e., the vent hole 120 penetrates the boss 12a, the second surface 12, and the first surface 11 in this order, and the vent hole 120 may be configured to be disposed corresponding to an explosion-proof valve of the cap assembly so that the explosion-proof valve may be at least partially located in the vent hole 120 in a thickness direction of the cap body when the explosion-proof valve is disposed on the cap body.

It can be seen that, through setting up bellying 12a at the second surface 12 of lower plastic, set up the air vent 120 of running through the first surface 11 of lower plastic spare 10 simultaneously on bellying 12a, utilize this air vent 120 can be used for corresponding explosion-proof valve setting to when the explosion-proof valve setting on the top cap body, this explosion-proof valve can be at least partly hold in air vent 120, the ventilation space of air vent 120 is great from this, can be fast and in time direct to explosion-proof valve department with the gas that energy memory's electric core produced for the explosion-proof valve can normally be released.

Further, the protruding portion 12a can also play a role in stopping a limiting electric core when the electric core of the energy storage device expands or moves, so that a buffer space can be formed between the second surface 12 of the lower plastic part 10 and the electric core, the situation that the electric core is damaged due to the fact that the lower plastic part 10 collides with the pole lugs on the electric core to be broken or cut is avoided in the electric core transportation process due to mechanical vibration, the electric core is protected, and the service life of the energy storage device is prolonged.

From the foregoing, the energy storage device may be a square battery or a cylindrical battery. Taking the square battery as an example of the energy storage device, the lower plastic member 10 may have a rectangular plate-like structure, i.e., the first surface 11 and the second surface 12 are actually two surfaces of the lower plastic member 10 along the thickness direction thereof (i.e., the Z direction in fig. 1 and 2), the protrusion 12a may be configured as a strip-like protrusion, and the length direction thereof may be consistent with the length direction of the lower plastic member 10 (i.e., the X direction in fig. 1 and 2), or the length direction of the protrusion 12a may be consistent with the width direction of the lower plastic member 10 (i.e., the Y direction in fig. 1 and 2), which will be described below.

As shown in fig. 1 to 3, in some embodiments, the lower plastic part 10 further includes a first side 13 and a second side 14 opposite to the first side 13, and the first side 13 and the second side 14 are connected to the first surface 11 and the second surface 12. That is, the first and second side surfaces 13 and 14 may be two surfaces of the lower plastic member 10 along the width direction thereof. The surface of the boss 12a facing away from the second surface 12 is a third surface 121, the boss 12a further includes a third side 122 and a fourth side 123 opposite to the third side 122, the third side 122 and the fourth side 123 are connected to the third surface 121, the third side 122 is flush with the first side 13, and the fourth side 123 is flush with the second side 14. In other words, the third side 122 and the fourth side 123 are two surfaces of the protruding portion 12a along the width direction of the lower plastic, and the third side 122 and the fourth side 123 are respectively flush with the first side 13 and the second side 14 of the lower plastic 10, so that the whole of the lower plastic 10 on the first side 13 and the second side 14 can be kept flat, that is, the protruding portion 12a and the lower plastic 10 on the first side 13 and the second side 14 can be kept flat, so that the connection of the lower plastic 10 and other components (such as mylar) of the energy storage device is facilitated. On the other hand, since the protruding portion 12a protrudes from the lower plastic part 10, the third side surface 122 and the fourth side surface 123 can also be used to increase the surface areas of the first side surface 13 and the second side surface 14, so that the connection area between the lower plastic part 10 and other components (such as mylar film) of the energy storage device can be increased, and further, the connection reliability and connection stability between the lower plastic part 10 and other components of the energy storage device can be improved.

For example, when the top cover assembly is applied to the energy storage device, the top cover assembly is generally connected to the housing of the energy storage device, and the battery core is contained in the housing of the energy storage device, and the outer periphery of the battery core is generally covered with the mylar film, at this time, the mylar film can be fixed by the lower plastic member 10 by connecting the mylar film with the lower plastic member 10, so as to avoid falling off from the outer periphery of the battery core. By way of example, the manner in which the mylar film and the lower plastic part 10 are attached may include, but is not limited to, for example, a snap fit connection, a hot melt connection. In either connection mode, because the protruding portion 12a exists, and the third side 122 and the fourth side 123 of the protruding portion 12a are respectively flush with the first side 13 and the second side 14, the surface areas of the first side 13 and the second side 14 of the lower plastic part 10 can be respectively increased by the third side 122 and the fourth side 123 of the protruding portion 12a, so that the connection area with the mylar film is increased, and the connection between the mylar film and the lower plastic part 10 is more reliable.

Further, the protruding portion 12a further includes a fifth side 124 and a sixth side 125 along the length direction of the lower plastic part 10, the sixth side 125 is opposite to the fifth side 124, and the fifth side 124 and the sixth side 125 are connected to the third side 122 and the fourth side 123. Considering that the fifth and

sixth sides

124 and 125 are two surfaces along the length direction of the lower plastic part 10, and the lower plastic part 10 is generally provided with an adapter for connecting with the pole of the top cap assembly and the pole lug on the battery cell along the length direction, in order to reduce the space occupation of the protruding part 12a along the length direction of the lower plastic part 10, the distance between the fifth and

sixth sides

124 and 125 may be smaller than the distance between the third and

fourth sides

122 and 123 for the protruding part 12a along the width direction of the lower plastic part 10, and the width direction of the protruding part 12a along the length direction of the lower plastic part 10.

As shown in FIG. 4, in some embodiments, the height of the protrusions 12a from the second surface 12 is h1, and the distance between the first surface 11 and the second surface 12 is h2 (i.e. the thickness of the lower plastic part 10 itself), then 1.5.ltoreq.h1/h 2.ltoreq.6. Therefore, the protrusion height of the protrusion 12a relative to the second surface 12 is far greater than the thickness of the lower plastic part 10, which is based on that when the explosion-proof valve is arranged on the top cover body, the explosion-proof valve is closer to the first surface 11 of the lower plastic part 10, so that the protrusion height of the protrusion 12a is far greater than the thickness of the lower plastic part 10, the energy storage device can be well provided, the lower plastic part 10 and the battery core of the energy storage device can be effectively blocked, the possibility that the battery core contacts with the explosion-proof valve in the vent 120 is avoided, the battery core and the explosion-proof valve are fully blocked, and the use safety of the energy storage device is improved. If h1/h2 is too small, that is, the protruding height of the protruding portion 12a is small, the protruding portion 12a may not fully separate the battery core from the explosion-proof valve, which may cause the battery core to contact with the explosion-proof valve, on one hand, the resistance of the gas flowing to the explosion-proof valve is too large, which affects the normal opening of the explosion-proof valve, and on the other hand, the two may also cause contact short circuit, which affects the use safety of the energy storage device. If h1/h2 is too large, the protruding height of the protruding portion 12a is too large, and the protruding portion 12a occupies more internal space of the energy storage device, so that the internal space of the energy storage device cannot be effectively utilized, and the energy density of the energy storage device is affected.

Illustratively, h1/h2 may be 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, etc.

Alternatively, the vent 120 may be shaped and sized to generally match the shape and size of the explosion proof valve, as shown in fig. 3. The size of the vent 120 and the size of the explosion proof valve may be adapted to: the vent 120 is sized to be equal to or slightly larger than the size of the explosion proof valve. And the shape of the vent hole 120 to be adapted to the shape of the explosion-proof valve may mean that: the vent 120 has a shape substantially identical to that of the explosion-proof valve. Generally speaking, the vent hole 120 is in a strip shape, and the vent hole 120 can be in a strip shape, and the length direction of the vent hole 120 can be along the length direction of the lower plastic part 10, so that the length of the vent hole 120 can be longer, and when the protruding part 12a contacts with the battery core of the energy storage device, the vent hole 120 is not easily blocked by the battery core and the structure on the battery core, so that the vent hole 120 can be ensured to guide the gas to the explosion-proof valve, and the explosion-proof valve can realize normal pressure relief.

Further, the vent hole 120 may be a oval hole, the vent hole 120 has an annular inner wall surface, the annular inner wall surface includes a first wall surface 120a, a second wall surface 120b along its own length direction, and a third wall surface 120c and a fourth wall surface 120d along its own width direction, the first wall surface 120a may be disposed adjacent to the fifth side surface 124, the second wall surface 120b may be disposed adjacent to the sixth side surface 125, the third wall surface 120c is disposed toward the third side surface 122, and the fourth wall surface 120d is disposed toward the fourth side surface 123, and since the length direction of the vent hole 120 is along the length direction of the lower plastic member 10, the pitches of the first wall surface 120a to the fifth side surface 124, and the pitches of the second wall surface 120b to the sixth side surface 125 are smaller than the pitches of the third wall surface 120c to the third side surface 122, and the fourth wall surface 120d to the fourth side surface 123.

It can be seen that when the vent hole 120 is disposed on the boss 12a, the length of the vent hole 120 is slightly smaller than the width of the boss 12a, and the width of the vent hole 120 is significantly smaller than the length of the boss 12a, so that the structural strength of the boss 12a is ensured, and the length of the vent hole 120 is made as large as possible, thereby further reducing the probability of the vent hole 120 being blocked when the boss 12a is in contact with the battery cell of the energy storage device.

According to the lower plastic part 10 disclosed in the first aspect of the application, the protruding portion 12a is arranged on the second surface 12 of the lower plastic part 10, and the vent hole 120 with the shape and the size approximately matched with those of the explosion-proof valve is arranged on the protruding portion 12a, so that when the lower plastic part 10 is connected to the top cover body of the top cover assembly, the explosion-proof valve can be arranged corresponding to the vent hole 120 and at least partially corresponds to the opening of the vent hole 120 on the first surface 11, so that the explosion-proof valve is at least partially positioned in the opening of the vent hole 120 on the first surface 11, namely, the explosion-proof valve is just opposite to the vent hole 120, and in this way, the ventilation space of the vent hole 120 is large, so that gas generated by a battery cell of the energy storage device can be quickly and timely and effectively guided to the explosion-proof valve directly, the explosion-proof valve can normally release pressure, the gas is prevented from being accumulated inside the energy storage device, and the use safety of the energy storage device is further improved.

Referring to fig. 5 to 7, in a second aspect, the present application further discloses a top cap assembly 20, where the top cap assembly 20 includes a top cap body 21, an explosion-proof valve 22, and the lower plastic part 10 according to the first aspect. The top cover body 21 is provided with a through pressure relief hole 210, that is, the pressure relief hole 210 penetrates through both sides of the top cover body 21 in the thickness direction, and the explosion-proof valve 22 is sealed in the pressure relief hole 210. The first surface 11 of the lower plastic part 10 may be connected to the top cover body 21, and the vent hole 120 on the lower plastic part 10 is disposed corresponding to the pressure relief hole 210, so that when the explosion-proof valve 22 does not seal the pressure relief hole 210, the vent hole 120 may be communicated with the pressure relief hole 210 along the penetrating direction of the pressure relief hole 210, so that the vent hole 120 may be disposed corresponding to the explosion-proof valve 22, thereby being more beneficial to the vent hole 120 to directly guide the air flow to the explosion-proof valve 22, and ensuring the normal pressure relief of the explosion-proof valve 22.

Optionally, the explosion-proof valve 22 has a fourth surface 220 facing the second surface 12 of the lower plastic part 10, and a space is provided between the fourth surface 220 and a surface of the boss 12a facing away from the second surface 12 (i.e., the third surface 121 of the boss 12 a) along the thickness direction of the top cover body 21 (the thickness direction of the top cover body 21 is consistent with the thickness direction of the lower plastic part 10), that is, even if the explosion-proof valve 22 is disposed corresponding to the opening of the vent 120, the space is provided between the fourth surface 220 and the second surface 12, so that when the battery cell of the energy storage device abuts against the boss 12a, in fact, when the battery cell abuts against the third surface 121 of the boss 12a, the battery cell is not easy to touch the explosion-proof valve 22, so that it is ensured that the battery cell and the explosion-proof valve 22 have a space therebetween during use of the energy storage device, and thus the gas can be gathered toward the explosion-proof valve 22.

Alternatively, the surface area of the fourth surface 220 of the explosion-proof valve 22 may be S1, and the surface area of the surface of the cap body 21 provided with the pressure relief hole 210 may be S2, S1: s2=1/20-1/15. Exemplary, S1: s2 may be 1/19, 1/18, 1/17, 1/16, etc. Because the vent hole 120 on the boss 12a is disposed, and the explosion-proof valve 22 can be at least partially located in the vent hole 120, the vent hole 120 has a sufficient venting area, in this case, the size of the explosion-proof valve 22 can be properly reduced, so that the aperture of the pressure release hole 210 on the top cover body 21 can be correspondingly reduced, the area corresponding to the structurally weak portion of the top cover body 21 is reduced, and when the energy storage device is installed, the problem that the explosion-proof valve 22 is easily touched to cause failure due to oversized explosion-proof valve 22 can be reduced, which is beneficial to improving the overall structural stability of the energy storage device.

Referring to fig. 8 to 10, in a third aspect, the present application further discloses an energy storage device 30, where the energy storage device 30 may include a housing 31, a battery cell 32, and the top cover assembly 20 according to the second aspect. Specifically, the housing 31 may have an opening so that the battery cell 32 may be fitted into the housing 31 through the opening to be accommodated in the housing 31. The cap body 21 of the cap assembly 20 is coupled to the housing 31 to close the opening of the housing 31. The lower plastic member 10 is located at a side of the top cover body 21 facing the inside of the housing 31, that is, the lower plastic member 10 is disposed toward the battery cell 32, and the protruding portion 12a may be located between the explosion-proof valve 22 and the battery cell 32 along the opening direction of the housing 31.

It will be appreciated that the opening direction of the housing 31 is substantially aligned with the through direction of the pressure relief hole 210 in the cap body 21.

The protruding portion 12a on the lower plastic part 10 is located between the explosion-proof valve 22 and the battery cell 32 in the opening direction of the shell 31, so that the protruding portion 12a can play a role of resisting the limiting battery cell 32, and the situation that the battery cell 32 is damaged due to the fact that the battery cell 32 touches the lower plastic part 10 in the moving or expanding process is prevented. Meanwhile, the distance between the battery cell 32 and the explosion-proof valve 22 can be increased by utilizing the bulge 12a, so that gas can be better led to the explosion-proof valve 22 through the vent 120 of the bulge 12a, and normal pressure relief is realized.

As shown in fig. 9 and 10, alternatively, the battery cell 32 may include a top end 32a and a bottom end 32b disposed opposite the top end 32a, the bottom end 32b of the battery cell 32 may be adjacent to the bottom of the housing 31, and the top end 32a of the battery cell 32 may be adjacent to the top of the housing 31, i.e., the top end 32a of the battery cell 32 is adjacent to the opening of the housing 31. The tip 32a may have a tip surface 320, and a projection area of the explosion-proof valve 22 on the tip surface 320 in the opening direction of the case 31 is a first area 320a, and an insulating film is not attached to the first area 320 a.

Since the first region 320a is a region of the top end surface 320 corresponding to the explosion-proof valve 22, the insulating film is not attached to the first region 320a, so that the insulating film can be prevented from blocking the gas generated by the cell 32, and the gas can be converged and drained to the explosion-proof valve 22 through the first region 320 a.

Further, the region of the top surface 320 other than the first region 320a may be a second region 320b, and the second region 320b may be attached with an insulating film 3201. The insulating films 3201 are adhered to the areas of the top end surface 320 except the first area 320a, so that other areas of the top end surface 320 except the first area 320a can be covered, and the gases in the other areas cannot pass through the areas, so that the gases are more easily concentrated to the first area 320a, to which the insulating films are not adhered, for gathering, and the explosion-proof valve 22 is more beneficial to realizing the pressure relief function.

For example, as shown in fig. 10, an insulating film 3201 is attached to the second region 320b (the insulating film 3201 is shown by a filled cross-sectional line), and the insulating film is not attached to the first region 320 a. As can be seen in fig. 10, the gas generated by the cell 32 can be directed to the vent 120 on the boss 12a via the first region 320a to be directed to the explosion-proof valve 22 via the vent 120.

Alternatively, the insulating film 3201 may include, but is not limited to, a blue film, a barrier film, and the like.

Optionally, the energy storage device 30 of the present application may include one or more battery cells 32. When the plurality of cells 32 includes a plurality of cells 32 may be sequentially arranged along the width direction of the top cover body 21, and an air flow channel may be formed between two adjacent cells 32, where a projection of the air flow channel on the top cover body 21 may be located on the explosion-proof valve 22, and the air flow channel is communicated with the vent 120 and the inside of the housing 31. Therefore, the gas generated among the plurality of battery cores 32 can be guided by the airflow channel, so that the gas can be conveniently guided to the vent hole 120 to be concentrated to the explosion-proof valve 22, and the explosion-proof valve 22 is beneficial to realizing the pressure relief function.

In a fourth aspect, the present application also discloses a powered device (not shown), which may include the energy storage device of the third aspect. In particular, the powered device may include, but is not limited to, a vehicle, an energy storage system, an electronic product (e.g., a cell phone, a notebook computer, a tablet computer, etc.).

The lower plastic part, the top cover assembly, the energy storage device and the electric equipment disclosed in the embodiment of the application are described in detail, specific examples are applied to the description of the principle and the implementation of the application, and the description of the above embodiments is only used for helping to understand the lower plastic part, the top cover assembly, the energy storage device and the electric equipment and the core ideas of the application; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the ideas of the present application, the contents of the present specification should not be construed as limiting the present application in summary.

Claims

1. The utility model provides a plastic part down, its characterized in that is applied to top cap subassembly, top cap subassembly includes top cap body and explosion-proof valve, explosion-proof valve set up in top cap body, plastic part includes down:

the first surface is used for being arranged on the top cover body;

the second surface, the second surface with the first surface sets up in opposite directions, the protruding bellying that is equipped with of second surface, the bellying deviate from the one side of second surface is equipped with the air vent, the air vent link up to the first surface, the air vent is configured to correspond to the explosion-proof valve sets up, in order to when the explosion-proof valve set up in the top cap body, along in the thickness direction of top cap body, the explosion-proof valve is located at least partially in the air vent.

2. The lower plastic part according to claim 1, wherein the height of the protrusion from the second surface is h1, and the distance from the first surface to the second surface is h2, and h1/h2 is 1.5-6.

3. The lower plastic part of claim 1, further comprising a first side and a second side opposite the first side, the first side and the second side both being connected to the first surface and the second surface;

4. A lower plastic part according to claim 3, wherein the vent hole is a long hole, and the length direction of the vent hole is along the length direction of the lower plastic part.

5. A header assembly, the header assembly comprising:

the top cover body is provided with a through pressure relief hole;

the explosion-proof valve is sealed in the pressure relief hole; and

the lower plastic part according to any one of claims 1 to 4, wherein the vent hole is communicated with the pressure relief hole along a penetrating direction of the pressure relief hole.

6. The cap assembly of claim 5, wherein the explosion proof valve has a fourth surface adjacent to the second surface of the lower plastic part, and a space is provided between the fourth surface and a side of the boss facing away from the second surface in a thickness direction of the cap body.

7. The cap assembly of claim 5 or 6, wherein the surface area of the explosion-proof valve is S1, and the surface area of the surface of the cap body provided with the pressure relief hole is S2, S1: s2=1/20-1/15.

8. An energy storage device, comprising a housing, a cell, and a cap assembly according to any one of claims 5-7, wherein the housing has an opening, the cell is accommodated in the housing, the cap body of the cap assembly is connected to the housing to cover the opening, the lower plastic member is disposed toward the cell, and the protruding portion is located between the explosion-proof valve and the cell along the opening direction of the housing.

9. The energy storage device of claim 8, wherein the electrical core comprises a top end and a bottom end opposite to the top end, the top end is close to the opening of the housing, the top end has a top end surface, a projection area of the explosion-proof valve on the top end surface along the opening direction of the housing is a first area, and the first area is not attached with an insulating film.

10. The energy storage device of claim 9, wherein the region of the top end surface other than the first region is a second region to which an insulating film is attached.

11. The energy storage device of claim 9, wherein the plurality of cells are arranged in sequence along the width direction of the top cover body, and an airflow channel is formed between two adjacent cells;

the projection of the air flow channel on the top cover body is positioned on the explosion-proof valve, and the air flow channel is communicated with the vent hole and the inside of the shell.

12. A powered device comprising an energy storage device as claimed in any one of claims 9-11.