CN218300120U - Single battery, battery module and battery pack - Google Patents

Abstract

The utility model provides a battery cell, battery module and battery package. The single battery comprises a shell, a naked battery core, an end cover assembly and a second valve body; the end cover assembly comprises a first valve body, the first valve body is provided with an air inlet, and a first exhaust port and a second exhaust port are sequentially arranged at intervals along a first direction; the second valve body and first valve body swing joint, first gas vent and second gas vent are sealed to the second valve body lid, and the second valve body can move along the direction of keeping away from first valve body under the atmospheric pressure effect of the inner chamber of casing to make the second valve body relieve the closure to first gas vent and second gas vent in proper order. The utility model discloses a single cell, when the inside atmospheric pressure of single cell is higher, can satisfy the requirement with gaseous quick exhaust.

Description

Single battery, battery module and battery pack

Technical Field

The utility model relates to a battery technology field especially relates to a battery cell, battery module and battery package.

Background

During the operation of the battery, gas is generated inside the battery, and the gas pressure inside the battery gradually increases as the gas is generated. In order to prevent that atmospheric pressure is too big and lead to the battery explosion, can be provided with the explosion-proof valve on the battery, after the inside atmospheric pressure of battery reaches the default, the explosion-proof valve is opened, and the inside some gas of battery passes through the explosion-proof valve and discharges.

For part of the explosion-proof valve, when the gas pressure inside the battery is higher, the gas to be discharged is more, and the explosion-proof valve is difficult to meet the requirement of quickly discharging the gas.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a single cell can satisfy gaseous quick exhaust requirement when the inside atmospheric pressure of single cell is higher.

The utility model also provides a battery module including above-mentioned battery cell.

The utility model also provides a battery package.

According to the utility model discloses cell of the embodiment of first aspect includes: the shell is provided with a first accommodating cavity and an opening which are communicated with each other; the naked battery cell is accommodated in the first accommodating cavity; the end cover assembly covers the opening, is electrically connected with the bare cell and comprises a first valve body, an air inlet, a first exhaust port and a second exhaust port are formed in the first valve body, the air inlet is communicated with the first accommodating cavity, and the first exhaust port and the second exhaust port can be communicated with the air inlet; the second valve body, with first valve body swing joint, the second valve body lid seals first exhaust port with the second exhaust port, the second valve body can be in the atmospheric pressure effect of first holding the chamber down to keeping away from the direction motion of first valve body, and make the second valve body removes in proper order to first exhaust port with the closure of second exhaust port.

According to the utility model discloses the battery cell of first aspect embodiment has following beneficial effect at least:

the gas inside the battery can enter the interior of the explosion-proof valve through the gas inlet, and the pressure of the gas inside the battery acts on the second valve body and tends to move the second valve body away from the first valve body. After the internal air pressure of the battery reaches a certain preset value, the second valve body is pushed by the gas in the battery for a certain distance so as to remove the sealing of the second valve body to the first exhaust port (the second exhaust port is still in a sealing state), and at the moment, the gas can be discharged out of the single battery through the first exhaust port. At this time, the single battery is in a state of small pressure relief.

When the gas pressure in the battery is at a larger value, the second valve body is pushed by the gas in the battery for a longer distance, the sealing of the first exhaust port and the second exhaust port by the second valve body is released, and at the moment, the gas can be exhausted through the first exhaust port and the second exhaust port. When the first exhaust port and the second exhaust port are both sealed, the single battery is in a rapid pressure relief state; compare in the state of a small amount of pressure release, the exhaust gas vent that the battery cell supplied gas to exhaust increases during quick pressure release, and the battery cell can discharge more gas fast. Therefore, the utility model discloses a single cell can satisfy the requirement with gaseous quick exhaust when inside atmospheric pressure is higher.

According to some embodiments of the utility model, the battery cell still includes the elastic component, the both ends of elastic component respectively with first valve body the second valve body is connected, the elastic component has elasticity, the elastic component is in produce deformation under the pulling of second valve body, wherein, the elastic component is used for the drive at the in-process that resumes deformation the second valve body resets.

According to some embodiments of the present invention, when the air pressure of the first accommodating chamber is greater than the maximum bearing internal pressure value, the elastic member is broken, and the maximum bearing internal pressure value is 0.7-0.9MPa.

According to the utility model discloses a some embodiments, first valve body includes: a first body portion, the air inlet being provided to the first body portion; the bulge, set up in first main part is kept away from one side of naked electric core, and surround in the periphery of air inlet, the bulge with first main part encloses jointly and links up the chamber, first exhaust port set up in the lateral part of bulge, the second exhaust port set up in the bulge is kept away from the one end of first main part, first exhaust port the second exhaust port with the air inlet all with link up the chamber intercommunication.

According to some embodiments of the invention, the second valve body comprises: a second body portion that covers the second exhaust port; the outer blocking part is connected to the outer edge of the second main body part and protrudes relative to the second main body part in the direction close to the first main body part, and the outer blocking part is movably sleeved outside the protruding part and covers and seals the first exhaust port.

According to some embodiments of the present invention, the second valve body further comprises an inner blocking portion, the inner blocking portion is connected to the second main body portion, the inner blocking portion is disposed in the linking cavity, and the inner blocking portion is abutted to the first main body portion to separate the first exhaust port from the air inlet.

According to some embodiments of the present invention, a mounting groove is formed on a side of the first main body portion close to the second valve body, the air inlet and the linking cavity are both communicated with the mounting groove, the protruding portion is disposed at a periphery of the mounting groove, and the inner blocking portion covers the mounting groove; the explosion-proof valve further comprises an elastic piece, the elastic piece is arranged in the mounting groove, the bottom wall of the mounting groove and the inner plugging portion are respectively connected with two ends of the elastic piece, and the pulling force of the elastic piece is used for driving the inner plugging portion to move towards the direction close to the mounting groove.

According to some embodiments of the utility model, the battery cell still includes the adsorption piece, the adsorption piece set up in the first exhaust port, the adsorption piece is used for absorbing steam.

According to the utility model discloses battery module of the embodiment of second aspect, including module shell and a plurality of first aspect embodiment the battery cell, battery cell install in the inside of module shell, it is a plurality of the battery is established ties each other or is parallelly connected.

According to the utility model discloses battery module of the embodiment of third aspect includes: a plurality of batteries provided; the battery box comprises a box body, a battery and a first valve body, wherein a second accommodating cavity is formed in the box body, the battery is arranged in the second accommodating cavity, the box body is also provided with the first valve body, the first valve body is provided with an air inlet, a first exhaust port and a second exhaust port, the air inlet is communicated with the second accommodating cavity, and the first exhaust port and the second exhaust port can be communicated with the air inlet; the second valve body, with first valve body swing joint, second valve body cap seal first exhaust port with the second exhaust port, the second valve body can hold under the atmospheric pressure effect in chamber the second is to keeping away from the direction motion of first valve body, and makes the second valve body relieves in proper order right first exhaust port with the closure of second exhaust port.

According to the utility model discloses battery cell of third aspect embodiment has following beneficial effect at least: the battery pack has a small pressure relief state and a quick pressure relief state, when the air pressure inside the battery pack is large, the sealing of the first exhaust port and the second exhaust port is released, and the battery pack can rapidly exhaust more gas.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The invention will be further described with reference to the following drawings and examples, in which:

fig. 1 is an assembly view (not vented state) of a first valve body and a second valve body in an embodiment of the present invention;

FIG. 2 is a schematic view of the first valve body of FIG. 1;

FIG. 3 is a schematic view of the second valve body of FIG. 1;

fig. 4 is a schematic diagram of a single battery or a battery pack in a state of small amount of pressure relief;

fig. 5 is a schematic diagram of a single battery or a battery pack in a rapid pressure relief state;

FIG. 6 is a schematic view of the installation position of the adsorbing member;

fig. 7 is a schematic diagram of a single battery according to an embodiment of the present invention;

fig. 8 is a schematic view of the internal structure of the unit cell shown in fig. 7;

fig. 9 is a schematic view of an internal structure of a battery pack according to an embodiment of the present invention.

Reference numerals are as follows:

101-a first valve body, 102-a second valve body, 103-an elastic element, 104-an air inlet, 105-a first exhaust port, 106-a second exhaust port, 107-an engagement cavity, 108-a mounting groove;

201-first body portion, 202-protrusion, 203-adsorption member;

301-a second body portion, 302-an outer blocking portion, 303-an inner blocking portion;

400-single battery, 401-shell, 402-end cover component, 403-pole, 404-first accommodating cavity, 405-second accommodating cavity;

501-naked battery cell, 502-pole ear;

601-battery pack, 602-box, 603-battery.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the directional descriptions, such as the directions or positional relationships indicated by upper, lower, front, rear, left, right, etc., are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but not for indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means is one or more, a plurality of means is two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the terms in the present invention by combining the specific contents of the technical solution.

In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The utility model provides a single cell 400, referring to fig. 7 and 8, single cell 400 includes casing 401, naked electric core 501, end cover assembly 402 and the second valve body 102, and wherein, end cover assembly 402 includes first valve body 101, second valve body 102 and first valve body 101 swing joint. The second valve body 102 is engaged with the first valve body 101 to seal the unit cells 400 and discharge gas when the internal pressure of the case 401 is excessive.

Casing 401 cavity setting, the inside cavity of casing 401 is first holding chamber 404, and casing 401 offers the opening with first holding chamber 404 intercommunication. Naked electric core 501 can set up to coiling formula electricity core or lamination formula electricity core, and naked electric core 501 holds in first holding chamber 404, and the opening (not shown) supplies naked electric core 501 to get into first holding chamber 404. Taking fig. 7 and fig. 8 as an example, the opening may be located at the top of the casing 401, the end cap assembly 402 is connected to the top of the casing 401 and covers the opening, and the end cap assembly 402 is electrically connected to the bare cell 501; for example, end cap assembly 402 includes utmost point post 403, and naked electric core 501 includes utmost point ear 502, and utmost point post 403 and utmost point ear 502 weld each other.

The end cap assembly 402 includes a first valve body 101. Referring to fig. 1, the first valve body 101 defines an inlet port 104, a first exhaust port 105, and a second exhaust port 106. Referring to fig. 4 or 5, the intake port 104 communicates with the first accommodation chamber 404, and both the first exhaust port 105 and the second exhaust port 106 can communicate with the intake port 104. The second valve body 102 is movably connected to the first valve body 101, and the second valve body 102 covers the first exhaust port 105 and the second exhaust port 106 (as shown in fig. 1), so that air and water outside the unit cell 400 are prevented from entering the first receiving chamber 404 through the first exhaust port 105 or the second exhaust port 106.

When the difference between the air pressure in the first accommodation chamber 404 and the air pressure outside the unit battery 400 is sufficiently large, the second valve body 102 can move in a direction away from the first valve body 101 by the air pressure of the first accommodation chamber 404. Referring to fig. 1, 4, and 5 in sequence, in the course of the upward movement of the second valve body 102 away from the first valve body 101, the second valve body 102 sequentially releases the closure of the first exhaust port 105 and the second exhaust port 106.

Referring to fig. 4, gas inside the unit cell 400 may enter the inside of the first valve body 101 through the gas inlet 104, and the pressure of the gas inside the unit cell 400 acts on the second valve body 102 and tends to move the second valve body 102 away from the first valve body 101. When the internal pressure of the single battery 400 reaches a predetermined value, the second valve body 102 is pushed by the gas inside the single battery 400 for a certain distance to release the sealing of the second valve body 102 to the first exhaust port 105 (the second exhaust port 106 is still in a sealed state), and at this time, the gas can be exhausted out of the single battery 400 through the first exhaust port 105 (as shown in fig. 4). At this time, the unit cell 400 is in a state of a small amount of pressure relief.

Referring to fig. 5, when the gas pressure inside the unit cell 400 is at a greater value, the second valve body 102 is pushed a greater distance by the gas inside the unit cell 400, the second valve body 102 unblocks both the first exhaust port 105 and the second exhaust port 106, and the gas can be discharged through the first exhaust port 105 and the second exhaust port 106. Referring to fig. 5, when the closures of the first and second exhaust ports 105 and 106 are released, the unit cell 400 is in a state of rapid pressure relief; compared with the small pressure relief state shown in fig. 4, the number of the exhaust ports for exhausting gas from the unit battery 400 is increased during rapid pressure relief, and the unit battery 400 can rapidly exhaust more gas. Therefore, the utility model discloses a cell 400 can satisfy the requirement with gaseous quick exhaust when inside atmospheric pressure is higher.

In some embodiments, after the exhaust is completed, second valve body 102 may be moved in the opposite direction to reset, and second valve body 102 re-closes first exhaust port 105 and second exhaust port 106, thereby continuing to block the ingress of ambient air and water into the interior of housing 401. For example, after the exhaust is completed, the second valve body 102 in fig. 4 moves downward and returns to the position shown in fig. 1. If the second valve body 102 covers the first valve body 101, the second valve body 102 can move in the second direction by the gravity of the second valve body 102 itself to be reset. Still alternatively, referring to fig. 1 and 4, the single cell 400 may further include an elastic member 103, two ends of the elastic member 103 are respectively connected to the first valve body 101 and the second valve body 102, the second valve body 102 pulls the elastic member 103 to deform the elastic member 103 when the second valve body 102 is far away from the first valve body 101, and the second valve body 102 is driven by the pulling force of the elastic member 103 to move in a direction close to the first valve body 101 when the elastic member 103 is restored.

The elastic member 103 may be provided as a tension spring, a rubber column having elasticity, or the like. When the second valve body 102 is in the initial position (the position shown in fig. 1), the elastic member 103 may be in a stretched state, and the tension of the elastic member 103 is used to make the second valve body 102 cover the first valve body 101.

In the case that the second valve body 102 is driven to return by the tensile force of the elastic member 103, when the pressure inside the single battery 400 is very high, the elastic member 103 itself may break, and then the second valve body 102 may be flushed away by the discharged gas, the second valve body 102 may fall off the first valve body 101, the second gas outlet 106 may not be blocked by the second valve body 102, and the gas may be rapidly discharged from the second gas outlet 106.

In some embodiments, when the air pressure in the first accommodating cavity 404 is 0.3-0.7MPa, the second valve body 102 only releases the sealing of the first exhaust opening 105, and the single battery 400 is in a small pressure relief state. When the air pressure of the first accommodating cavity 404 is greater than the maximum bearing internal pressure value of the single battery 400, the elastic member 103 is broken, and the single battery 400 is in a rapid pressure relief state. The maximum internal pressure can be 0.7-0.9MPa.

Referring to fig. 1, the movable connection between the first valve body 101 and the second valve body 102 may be a sliding connection, for example, the second valve body 102 may be slidably sleeved outside a portion of the first valve body 101. Referring to fig. 2, in some embodiments, the first valve body 101 includes a first main body portion 201 and a protrusion 202, and in conjunction with fig. 2 and 4, the protrusion 202 is connected to a side of the first main body portion 201 away from the bare cell 501 and protrudes relative to the first main body portion 201. Referring to fig. 1 and 2, the second valve body 102 is slidably disposed on the outside of the protrusion 202. The first body portion 201 may directly serve as a cover plate in the endcap assembly 402 for covering the opening of the housing 401. Referring to fig. 2, the air inlet 104 is disposed on the first main body portion 201, the protruding portion 202 surrounds the periphery of the air inlet 104, and the protruding portion 202 and the first main body portion 201 together enclose the engaging cavity 107. The first exhaust port 105 is disposed at a side portion of the protruding portion 202, and the second exhaust port 106 is disposed at an end of the protruding portion 202 away from the first main body portion 201, so as to satisfy a requirement that the first exhaust port 105 and the second exhaust port 106 are sequentially disposed at intervals along the first direction. Referring to fig. 2, 4 and 5, the first exhaust opening 105, the second exhaust opening 106 and the gas inlet 104 are all communicated with the joining cavity 107, and the gas in the first accommodating cavity 404 can enter the joining cavity 107 from the gas inlet 104 and then be exhausted from at least one of the first exhaust opening 105 and the second exhaust opening 106.

In fig. 4, the two elastic members 103 are only disposed on the left and right sides of the gas inlet 104, the elastic members 103 do not completely surround the periphery of the gas inlet 104, gas can flow through the gap between the elastic members 103 to the first gas outlet 105, and the elastic members 103 do not completely block the gas from flowing to the first gas outlet 105. In addition, when the elastic member 103 is provided as a tension spring, the gap formed by stretching the elastic member 103 itself may allow gas to pass therethrough.

To match the shape of the first valve body 101 described above, the second valve body 102 includes a second body portion 301 and an outer blocking portion 302. Referring to fig. 3, the outer blocking portion 302 is connected to the outer edge of the second main body portion 301, and the outer blocking portion 302 protrudes in a direction close to the first main body portion 201 relative to the second main body portion 301, that is, the outer blocking portion 302 protrudes in a second direction relative to the second main body portion 301. Referring to fig. 1 and 3, the second main body 301 covers the second exhaust port 106, and the outer blocking portion 302 movably fits over the protrusion 202 and covers the first exhaust port 105.

Referring to fig. 3, in some embodiments, the second valve body 102 further comprises an inner blocking portion 303, the inner blocking portion 303 being connected to the second body portion 301, the inner blocking portion 303 and the outer blocking portion 302 projecting in the same direction relative to the second body portion 301. With reference to fig. 1 and 3, an inner blocking portion 303 is disposed in the engagement cavity 107, and the inner blocking portion 303 can abut against the first main body portion 201 to separate the first exhaust opening 105 and the intake opening 104. Referring to fig. 4 or 5, when gas to be exhausted is about to enter the engaging cavity 107 from the first accommodating cavity 404, the gas first contacts with an end surface of the inner blocking portion 303 close to one end of the gas inlet 104, so as to push the inner blocking portion 303 to move along the first direction. Since the inner blocking portion 303 abuts against the first main body portion 201 and covers the air inlet 104, the distance between the inner blocking portion 303 and the air inlet 104 is small, which is beneficial to enabling the air pressure in the first accommodating cavity 404 to act on the second valve body 102 quickly and push the second valve body 102 away, thereby improving the exhaust efficiency.

Referring to fig. 1, in the case where the inner blocking portion 303 is provided, in order to leave a space for accommodating the elastic member 103 so as to provide the elastic member 103, a mounting groove 108 may be opened at a side of the first body portion 201 close to the second valve body 102, and the elastic member 103 is disposed in the mounting groove 108. The projection 202 is provided on the periphery of the mounting groove 108, thereby communicating the engaging chamber 107 with the mounting groove 108; the air inlet 104 may be provided at a bottom wall of the mounting groove 108 such that the air inlet 104 communicates with the mounting groove 108. One end of the elastic element 103 is connected with the bottom wall of the mounting groove 108, one end of the inner blocking part 303 for covering the mounting groove 108 is connected with the elastic element 103, and the pulling force of the elastic element 103 can drive the inner blocking part 303 to move towards the direction close to the mounting groove 108.

Referring to fig. 6, in some embodiments, the unit cell 400 further includes an adsorption member 203, the adsorption member 203 is disposed in the first exhaust opening 105, and the adsorption member 203 is used for absorbing moisture. The adsorbing member 203 may be made of porous material such as molecular sieve. If the adsorption member 203 is not provided, when the unit cell 400 is in a small pressure relief state, the first exhaust opening 105 is in an open state, and a part of the moisture in the external environment inevitably enters the first accommodating cavity 404 through the first exhaust opening 105. In the case where the adsorbing member 203 is provided, the adsorbing member 203 may absorb the moisture that is about to enter the first accommodating chamber 404, thereby preventing the moisture from contacting the bare cell 501 or the electrolyte to affect the performance of the unit battery 400.

The utility model also provides a battery module, battery module include the battery cell 400 in module shell and the above-mentioned arbitrary embodiment. The plurality of unit batteries 400 are arranged in the battery module, the unit batteries 400 are installed in the module housing, and the plurality of unit batteries 400 are connected in series or in parallel.

The above-mentioned structure of the first and second valve bodies 101 and 102 can also be applied not only to the unit batteries 400 but also to a battery pack.

With reference to fig. 1 and 9, the present invention further provides a battery pack 601, wherein the battery pack 601 includes a box 602, a battery 603 and a second valve body 102, wherein the box 602 includes a first valve body 101, and the first valve body 101 is movably connected to the second valve body 102. The inside of the box 602 is hollow, the cavity inside the box 602 is a second accommodating cavity 405, a plurality of batteries 603 are arranged in the battery pack 601, and the batteries 603 are installed in the second accommodating cavity 405. The battery 603 in the battery pack 601 may be a battery with a conventional explosion-proof valve mounted thereon, or may be the above-mentioned single battery 400. The gas exhausted from the battery 603 may be first filled in the second receiving chamber 405, and when the gas pressure in the second receiving chamber 405 is too large, the gas in the second receiving chamber 405 is exhausted to the outside of the housing 602.

First valve body 101 has been seted up air inlet 104, first gas vent 105 and second gas vent 106, and first gas vent 105 and second gas vent 106 all communicate with air inlet 104, and air inlet 104 and second hold the chamber 405 intercommunication. When the pressure difference between the air pressure in the second accommodating chamber 405 and the air pressure outside the battery pack 601 is sufficiently large, the second valve body 102 moves away from the first valve body 101 under the action of the air pressure in the second accommodating chamber 405, so that the second valve body 102 sequentially releases the closure of the first exhaust port 105 and the second exhaust port 106.

Referring to fig. 4, after the gas pressure inside the second accommodating chamber 405 reaches a predetermined value, the second valve body 102 is pushed by the gas inside the case 602 for a certain distance to release the second valve body 102 from the first exhaust port 105 (the second exhaust port 106 is still in a closed state), and the gas can be exhausted out of the case 602 through the first exhaust port 105, similarly to the exhausting manner of the single battery 400. At this time, the battery pack 601 is in a state of small pressure relief.

Referring to fig. 5, when the gas pressure inside the second accommodating chamber 405 is at a larger value, the second valve body 102 is pushed by the gas inside the tank 602 for a further distance, the second valve body 102 releases the sealing of the first exhaust port 105 and the second exhaust port 106, and the gas can be exhausted through the first exhaust port 105 and the second exhaust port 106. When the first exhaust port 105 and the second exhaust port 106 are both unsealed, the battery pack 601 is in a state of rapid pressure relief; compare in the state of small amount pressure release, battery package 601 increases for gas exhaust's gas vent during quick pressure release, and battery package 601 can discharge more gas fast.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.

Claims (10)

1. A battery cell (400), comprising:

the shell is provided with a first accommodating cavity (404) and an opening which are communicated with each other;

the bare cell is accommodated in the first accommodating cavity (404);

the end cover assembly covers the opening, is electrically connected with the bare cell and comprises a first valve body (101), the first valve body (101) is provided with an air inlet (104), a first air outlet (105) and a second air outlet (106), the air inlet (104) is communicated with the first accommodating cavity, and the first air outlet (105) and the second air outlet (106) can be communicated with the air inlet (104);

the second valve body (102) is movably connected with the first valve body (101), the second valve body (102) covers the first exhaust port (105) and the second exhaust port (106), the second valve body (102) can move in the direction away from the first valve body (101) under the action of air pressure of the first accommodating cavity (404), and the second valve body (102) sequentially releases the sealing of the first exhaust port (105) and the second exhaust port (106).

2. The single battery (400) according to claim 1, further comprising an elastic member (103), wherein two ends of the elastic member (103) are respectively connected with the first valve body (101) and the second valve body (102), the elastic member has elasticity, the elastic member (103) is deformed by pulling the second valve body (102), and the elastic member (103) is used for driving the second valve body (102) to reset in the process of restoring the deformation.

3. The battery cell (400) of claim 2, wherein the elastic member is broken when the gas pressure of the first receiving chamber is greater than a maximum withstand internal pressure value, the maximum withstand internal pressure value being 0.7-0.9MPa.

4. The battery cell (400) according to any one of claims 1 to 3, wherein the first valve body (101) comprises:

a first body part (201), wherein the air inlet (104) is arranged on the first body part (201);

bulge (202), set up in first main part (201) are kept away from the one side of naked electric core, and surround in the periphery of air inlet (104), bulge (202) with first main part (201) enclose jointly and link up chamber (107), first exhaust port (105) set up in the lateral part of bulge (202), second gas vent (106) set up in bulge (202) are kept away from the one end of first main part (201), first gas vent (105), second gas vent (106) with air inlet (104) all with link up chamber (107) intercommunication.

5. The battery cell (400) of claim 4, wherein the second valve body (102) comprises:

a second body (301) that covers and seals the second exhaust port (106);

and the outer blocking part (302) is connected to the outer edge of the second main body part (301) and protrudes relative to the second main body part (301) in the direction close to the first main body part (201), and the outer blocking part (302) is movably sleeved outside the protruding part (202) and covers and seals the first exhaust port (105).

6. The battery cell (400) according to claim 5, wherein the second valve body (102) further comprises an inner blocking portion (303), the inner blocking portion (303) is connected to the second main body portion (301), the inner blocking portion (303) is disposed in the engaging cavity (107), and the inner blocking portion (303) abuts against the first main body portion (201) to separate the first air outlet (105) and the air inlet (104).

7. The single battery (400) according to claim 6, wherein a mounting groove (108) is formed in one side of the first main body part (201) close to the second valve body (102), the air inlet (104) and the engagement cavity (107) are both communicated with the mounting groove (108), the protruding part (202) is arranged on the periphery of the mounting groove (108), and the inner blocking part (303) covers the mounting groove (108);

the single battery (400) further comprises an elastic piece (103), the elastic piece (103) is arranged in the installation groove (108), the bottom wall of the installation groove (108) and the inner blocking portion (303) are respectively connected with two ends of the elastic piece (103), and the pulling force of the elastic piece (103) is used for driving the inner blocking portion (303) to move towards the direction close to the installation groove (108).

8. The battery cell (400) of claim 1, further comprising an adsorption member (203), wherein the adsorption member (203) is disposed in the first exhaust opening (105), and wherein the adsorption member (203) is configured to absorb moisture.

9. A battery module, characterized by comprising a module housing and a plurality of single batteries (400) according to any one of claims 1 to 8, the single batteries (400) being mounted inside the module housing, the plurality of single batteries (400) being connected in series or in parallel with each other.

10. A battery pack (601), characterized by comprising:

a plurality of batteries (603) provided;

the battery storage box comprises a box body (602) and a first valve body (101), wherein a second accommodating cavity (405) is formed in the box body, a battery (603) is arranged in the second accommodating cavity (405), the first valve body (101) is provided with an air inlet (104), a first exhaust port (105) and a second exhaust port (106), the air inlet (104) is communicated with the second accommodating cavity (405), and the first exhaust port (105) and the second exhaust port (106) can be communicated with the air inlet (104);

the second valve body (102) is movably connected with the first valve body (101), the second valve body (102) covers the first exhaust port (105) and the second exhaust port (106), the second valve body (102) can move in the direction away from the first valve body (101) under the action of air pressure of the second accommodating cavity (405), and the second valve body (102) sequentially releases the sealing of the first exhaust port (105) and the second exhaust port (106).

Images