CN216720197U - Pressure release structure, battery box and battery package - Google Patents

Abstract

The utility model relates to the technical field of batteries and provides a pressure relief structure, a battery box body and a battery pack. The battery box body includes case body and pressure relief structure, and pressure relief structure sets up in the case body, and the case body includes well cavity, and pressure relief structure includes: the pressure relief main body is arranged on the box body and provided with a pressure relief channel; the stopping part is arranged in the pressure relief main body to block the hollow cavity, so that gas in the box body is prevented from flowing into the hollow cavity and cannot be discharged in time, the pressure relief capacity of the battery box body is improved, and the safety problem is avoided.

Description

Pressure release structure, battery box and battery package

Technical Field

The utility model relates to the technical field of batteries, in particular to a pressure relief structure, a battery box body and a battery pack.

Background

In the related art, a plurality of batteries are arranged in the battery pack, and the batteries may have problems that heat is too large during use and the batteries may explode if not discharged in time. Because the box structure itself is injectd, the gas in the battery box can flow to other positions, can't in time discharge to cause the safety problem.

SUMMERY OF THE UTILITY MODEL

The utility model provides a pressure relief structure, a battery box body and a battery pack, which are used for improving the performance of the battery box body.

According to a first aspect of the present invention, there is provided a battery box body, including a box body and a pressure relief structure, the pressure relief structure being disposed on the box body, the box body including a hollow cavity, the pressure relief structure including:

the pressure relief main body is arranged on the box body and provided with a pressure relief channel;

the stopping part is arranged on the pressure relief main body to block the hollow cavity.

The battery box body comprises a box body and a pressure relief structure, wherein the pressure relief structure is arranged on the box body. The pressure relief structure comprises a pressure relief main body and a stopping portion, the pressure relief main body is arranged on the box body, the pressure relief main body is provided with a pressure relief channel, the pressure relief channel can exhaust gas inside the box body, the stopping portion arranged on the pressure relief main body passes through the blocking hollow cavity, and therefore the gas inside the box body is prevented from flowing into the hollow cavity and cannot be exhausted timely, the pressure relief capacity of the battery box body is improved, and safety problems are avoided.

According to a second aspect of the present invention, there is provided a battery pack including the battery case described above.

The battery pack comprises a battery box body, wherein the battery box body comprises a box body and a pressure relief structure, and the pressure relief structure is arranged on the box body. The pressure relief structure comprises a pressure relief main body and a stopping portion, the pressure relief main body is arranged on the box body, the pressure relief main body is provided with a pressure relief channel, the pressure relief channel can exhaust gas inside the box body, the stopping portion arranged on the pressure relief main body passes through the blocking hollow cavity, and therefore the gas inside the box body is prevented from flowing into the hollow cavity and cannot be exhausted timely, the pressure relief capacity of the battery box body is improved, and safety problems are avoided.

According to a third aspect of the present invention, there is provided a pressure relief structure including:

the pressure relief main body is provided with a pressure relief channel;

the stopping part is arranged on the pressure relief main body, and an included angle between the stopping part and the pressure relief main body is larger than 0 degree and smaller than 180 degrees.

The pressure relief structure comprises a pressure relief main body and a stopping part, wherein the stopping part is arranged on the pressure relief main body, the pressure relief main body is provided with a pressure relief channel, the pressure relief channel can exhaust gas in the battery box body, and the stopping part arranged on the pressure relief main body can be used for plugging the hollow cavity of the battery box body, so that the problem that the gas in the battery box body flows into the hollow cavity and cannot be exhausted in time is avoided, the pressure relief capacity of the battery box body is improved, and the safety problem is avoided.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may be arranged differently as is known in the art. Further, in the drawings, like reference characters designate the same or similar parts throughout the several views. Wherein:

FIG. 1 is a schematic diagram of a battery case according to an exemplary embodiment;

FIG. 2 is a schematic illustration of a partial structure of a battery case according to an exemplary embodiment;

FIG. 3 is another partial schematic structural view of a battery case according to an exemplary embodiment;

FIG. 4 is a schematic diagram illustrating a structure of a battery receiving space of a battery case according to an exemplary embodiment;

FIG. 5 is a schematic diagram illustrating the configuration of the vent space of a battery case according to an exemplary embodiment;

FIG. 6 is a schematic diagram illustrating one perspective of a pressure relief structure of a battery case according to an exemplary embodiment;

FIG. 7 is a schematic diagram illustrating another perspective of a pressure relief structure of a battery case according to an exemplary embodiment;

FIG. 8 is a cross-sectional schematic view of a pressure relief structure of a battery case according to an exemplary embodiment;

FIG. 9 is a partially schematic, perspective, partial structure of a frame of a battery case according to an exemplary embodiment;

FIG. 10 is a partial schematic structural view of another perspective of a bezel of a battery case according to an exemplary embodiment;

fig. 11 is a partial structural view illustrating a battery pack according to an exemplary embodiment.

The reference numerals are explained below:

1. a pressure relief structure; 2. a battery module; 10. an exhaust space; 11. a main chamber; 12. an exhaust passage; 20. a first pressure relief vent; 30. a second pressure relief vent; 40. a battery accommodating space; 41. a base plate; 42. a frame; 421. a hollow cavity; 422. an installation space; 423. a main body portion; 4231. a beam section; 4232. a strut section; 424. a flange portion; 43. a partition structure; 44. a top cover of the box body; 50. a stopper portion; 51. a void; 511. a first void; 512. a second void; 52. a body member; 521. a first U-shaped structure; 522. a first plate body; 53. a support member; 531. a second U-shaped structure; 532. a second plate body; 54. a pressure relief body.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is, therefore, to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "an" object is also intended to mean one of many such objects possible.

The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as the case may be.

Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.

An embodiment of the present invention provides a battery box, please refer to fig. 1 to 11, the battery box includes a box body and a pressure relief structure 1, the pressure relief structure 1 is disposed on the box body, the box body includes a hollow cavity 421, the pressure relief structure 1 includes: the pressure relief main body 54, the pressure relief main body 54 is arranged on the box body, and the pressure relief main body 54 is provided with a pressure relief channel; the stopping portion 50 is disposed on the pressure releasing body 54, and the stopping portion 50 blocks the hollow cavity 421.

The battery box body comprises a box body and a pressure relief structure 1, wherein the pressure relief structure 1 is arranged on the box body. Pressure relief structure 1 includes pressure release main part 54 and backstop portion 50, and pressure release main part 54 sets up in the case body, and pressure release main part 54 is provided with the pressure release passageway, and the pressure release passageway can be with the inside gas outgoing of case body, and set up in cavity 421 in backstop portion 50 of pressure release main part 54 passes through the shutoff to this avoids the inside gas of case body to flow and can't in time discharge in the cavity 421, thereby improves the pressure relief ability of battery box, avoids appearing the safety problem.

It should be noted that, the gas in the tank body can be discharged through the pressure relief channel, and the hollow cavity 421 is blocked by the blocking portion 50, so that the gas in the tank body can be prevented from entering the hollow cavity 421, and therefore, the gas in the tank body can be basically discharged through the pressure relief channel. The hollow chamber 421 of the box body may be any portion of the box body that communicates with the inside of the box body, such as a hollow portion of the box body, a side space of the box body, and the like.

In one embodiment, as shown in fig. 1, 2, 6-10, the tank body further comprises: a bottom plate 41; frame 42, frame 42 encircle bottom plate 41 and set up, are formed with well cavity 421 in the frame 42, cavity 421 in the shutoff of backstop portion 50 to can guarantee that this internal gas of case can be discharged through the pressure release passageway, avoid gaseous inside incident that triggers the battery box.

It should be noted that the frame 42 is disposed around the bottom plate 41 and has no specific reference, and it is emphasized that the frame 42 forms a circumferentially closed space. The frame 42 is connected to the base plate 41, and the frame 42 may be disposed on the base plate 41, or the frame 42 may be connected to a circumferential edge of the base plate 41, which is not limited herein. The battery case further includes a case top cover 44, and the case top cover 44 is connected to the frame 42 and disposed opposite to the bottom plate 41 so that the battery case can form a closed space, as shown in fig. 1.

The bezel 42 may include a beam member that is a hollow beam member, i.e., a hollow cavity 421 therein, as shown in fig. 9 and 10. The pressure relief structure 1 may be fixed on the frame 42, and the pressure relief structure 1 may be non-detachably connected to the frame 42. Alternatively, the pressure relief structure 1 may be detachably connected to the frame 42.

In one embodiment, as shown in fig. 2, the frame 42 is provided with an installation space 422, and the pressure relief structure 1 is disposed in the installation space 422, so that the pressure relief structure 1 can be reliably installed on the frame 42, and the problem of looseness of the pressure relief structure 1 after long-term use is avoided.

It should be noted that, the pressure relief structure 1 is disposed in the installation space 422, that is, at least a part of the pressure relief structure 1 may be adapted to the installation space 422, so as to ensure that the pressure relief structure 1 is reliably installed on the frame 42, thereby avoiding the problem of looseness. The pressure relief structure 1 is used for discharging gas in the battery box body.

In one embodiment, the bottom of the frame 42 is flush with the bottom of the pressure relief structure 1, so as to prevent the pressure relief structure 1 from protruding out of the bottom of the frame 42, and prevent the pressure relief structure 1 from interfering with other structures, thereby ensuring the stability of the pressure relief structure 1.

In one embodiment, the outer surface of the frame 42 is flush with the outer surface of the pressure relief structure 1, which not only ensures the flatness of the structure, but also prevents the pressure relief structure 1 from protruding out of the outer surface of the frame 42, and prevents the pressure relief structure 1 from interfering with other structures, thereby ensuring the stability of the pressure relief structure 1.

In some embodiments, the installation space 422 may be a through hole structure, and in this case, the pressure relief structure 1 may be stably installed inside the bezel 42.

In some embodiments, the installation space 422 may be a notch structure, and at this time, the pressure relief structure 1 may be clamped between the bottom plate 41 and the frame 42, so that the bottom plate 41 and the frame 42 stably clamp the pressure relief structure 1, thereby preventing the pressure relief structure 1 from being loosened.

In one embodiment, as shown in fig. 1, 4 and 5, the box body further comprises: a partition structure 43, wherein the partition structure 43 is disposed in the frame 42 to form a battery accommodating space 40 and an exhaust space 10 on the upper and lower sides of the partition structure 43, respectively, and gas in the battery accommodating space 40 can be collected to the exhaust space 10 through the partition structure 43 and exhausted; the blocking portion 50 prevents the hollow cavity 421 from communicating with the exhaust space 10, so as to ensure that the gas in the case body is exhausted through the pressure relief channel, thereby preventing the gas from causing safety accidents inside the battery case body.

The bottom plate 41 and the frame 42 form a large cavity, and the partition structure 43 can divide the large cavity into an upper part and a lower part, namely the battery accommodating space 40 and the exhaust space 10, and the partition structure 43 is used for dividing the battery accommodating space 40 and the exhaust space 10. The partition structure 43 may not connect the battery accommodating space 40 and the exhaust space 10, and only after the pressure inside the battery accommodating space 40 reaches a certain value, the gas may burst through the partition structure 43 and enter the exhaust space 10, for example, the partition structure 43 includes a valve body or a thinning structure, etc. Alternatively, the partition structure 43 may communicate the battery accommodating space 40 with the exhaust space 10, for example, the partition structure 43 may be provided with a hole to timely exhaust gas into the exhaust space 10, thereby improving the heat dissipation capacity in the battery accommodating space 40.

The battery receiving space 40 may not be provided with other partition structures therein, i.e., the battery receiving space 40 is one receiving space. Alternatively, other partition structures may be provided inside the battery receiving space 40, for example, at least one beam is provided inside the battery receiving space 40, thereby forming at least two receiving spaces.

The inside of the exhaust space 10 may not be provided with other partition structures, that is, the exhaust space 10 is a space. Alternatively, the inside of the exhaust space 10 may be provided with other partition structures, for example, at least one beam is provided inside the exhaust space 10, thereby forming at least two spaces.

The bottom plate 41 may be used to shield the bottom of the battery case, and the specific structure of the bottom plate 41 is not limited. The frame 42 is connected to the bottom plate 41, and the frame 42 may be formed by splicing a plurality of beam members, or the frame 42 may be an integral plate-shaped structure to enclose a circumferential closed space.

In one embodiment, as shown in fig. 4 and 5, the exhaust space 10 includes: a main cavity 11, the main cavity 11 being superposed with the battery housing space 40; exhaust passage 12, exhaust passage 12 are located the lateral part of main cavity 11, and exhaust passage 12 intercommunication main cavity 11, and the gas in battery accommodation space 40 can pass through main cavity 11 and exhaust passage 12 in proper order and discharge to avoid causing the inside incident of battery box.

The frame 42 forms the exhaust passage 12, and the blocking portion 50 prevents the hollow chamber 421 from communicating with the exhaust passage 12. The frame 42 forms the exhaust passage 12, and a portion of the frame 42 is cut away to expose the hollow chamber 421 of the beam, so that the hollow chamber 421 can be stopped by the stopping portion 50 to prevent the hollow chamber 421 from communicating with the exhaust passage 12.

In some embodiments, the exhaust passage 12 may be one, in which case, the stopping portions 50 may be two, two stopping portions 50 may block two openings of the hollow cavity 421, and the stopping portions 50 may be a plate-shaped structure.

In some embodiments, as shown in fig. 6 to 8, the number of the stopping portions 50 is at least two, and the frame 42 forms at least two exhaust channels 12, so as to ensure that the gas in the box body can be exhausted in time, thereby ensuring the safety performance of the battery pack.

In some embodiments, the frame 42 forms at least two exhaust passages 12, adjacent exhaust passages 12 may be spaced apart, and one pressure relief structure 1 may correspond to at least two exhaust passages 12, in which case, the number of the stopping portions 50 may be at least four, so as to block four openings exposed by the hollow cavity 421.

Pressure relief channel can include first pressure relief hole 20 and second pressure relief hole 30, is used for placing the battery in the battery accommodation space 40, and when battery internal pressure was too high, the inside gas of battery can break through protection architecture such as explosion-proof valve of battery to this enters into in the battery accommodation space 40, and can pass through main cavity 11 in proper order, exhaust passage 12 and first pressure relief hole 20 and be discharged by second pressure relief hole 30, thereby avoid battery box internal pressure too high. The exhaust passage 12 provided at the side of the main chamber 11 can collect gas, thereby increasing the gas exhaust rate. For example, the battery accommodating space 40 may be approximated to be a first rectangular cavity, and the main cavity 11 may be approximated to be a second rectangular cavity, in which case, the exhaust passage 12 may be a passage communicating with the second rectangular cavity, and the exhaust passage 12 may be a structure outside the second rectangular cavity, so as to collect gas, and the specific structural shape of the exhaust passage 12 is not limited.

In one embodiment, as shown in fig. 6-8, the pressure relief channel comprises: a plurality of first pressure relief holes 20, the first pressure relief holes 20 being disposed on an inner surface of the exhaust space 10 to communicate with the exhaust space 10; a plurality of second pressure relief holes 30, the second pressure relief holes 30 being disposed at an outer surface of the exhaust space 10 and communicating with the first pressure relief holes 20; wherein the cross-sectional area of the first pressure relief hole 20 is smaller than that of the second pressure relief hole 30. The gas in the box body can be discharged out of the battery box body through the exhaust space 10, the first pressure relief holes 20 and the second pressure relief holes 30, so that the problem that the internal pressure of the battery box body is too large is avoided, and a series of problems caused by thermal runaway can be effectively prevented.

The cross-sectional area of the first pressure relief hole 20 is smaller than that of the second pressure relief hole 30, the first pressure relief hole 20 is communicated with the exhaust space 10, and the second pressure relief hole 30 is communicated with the first pressure relief hole 20, namely, the gas in the battery box sequentially passes through the exhaust space 10, the first pressure relief hole 20 and the second pressure relief hole 30.

It should be noted that the cross-sectional area of the first pressure relief hole 20 is smaller than that of the second pressure relief hole 30, so that the first pressure relief hole 20 can achieve a deceleration effect on the gas, and the second pressure relief hole 30 can rapidly achieve the discharge of the gas, thereby avoiding the safety problems caused by thermal runaway. The small aperture has better effect on stopping spark and reducing speed than the large aperture, and the large aperture has better heat dissipation rate than the small aperture, so that the cross section area of the first pressure relief hole 20 is smaller than that of the second pressure relief hole 30, and reliable air exhaust is ensured.

The total area of the first pressure relief holes 20 is a, the total area of the second pressure relief holes 30 is b, b/a is more than or equal to 1.5 and less than or equal to 3, b/a is more than or equal to 1.5 and can reliably play a role in gas deceleration to avoid the problem of fire, and b/a is less than or equal to 3 to avoid the second pressure relief holes 30 from easily entering foreign matters, so that gas can be reliably discharged when thermal runaway, and an effective exhaust effect is ensured.

In some embodiments, b/a may be equal to 1.5, 1.55, 1.6, 1.9, 2, 2.4, 2.6, 2.7, 2.8, 2.9, 2.95, or 3, and so forth.

In some embodiments, the first pressure relief vent 20 may be a first through hole and the second pressure relief vent 30 may be a second through hole.

First pressure release hole 20 may not be provided with other structures inside, and second pressure release hole 30 may not be provided with other structures inside, and at this moment, exhaust space 10 may be through first pressure release hole 20 and second pressure release hole 30 lug connection external, when first pressure release hole 20 and second pressure release hole 30 are directly opposite, can be by external direct observation exhaust space 10.

Other structures, such as a valve body and a similar explosion-proof valve, may be disposed inside the first pressure relief hole 20, and when the pressure in the exhaust space 10 reaches a certain value, the above structures may be broken, so as to achieve the exhaust. Other structures, such as a valve body and a similar explosion-proof valve, may be disposed inside the second pressure relief hole 30, and when the pressure in the exhaust space 10 reaches a certain value, the above structures may be broken, so as to exhaust.

In some embodiments, the first pressure relief hole 20 may be an arcuate hole, a polygonal hole, a shaped hole, etc., and the second pressure relief hole 30 may also be an arcuate hole, a polygonal hole, a shaped hole, etc.

In some embodiments, the first pressure relief hole 20 is a first circular hole, and the second pressure relief hole 30 is a second circular hole, which not only facilitates the structure formation, but also ensures that the air is smoothly discharged from the first pressure relief hole 20 and the second pressure relief hole 30. The aperture of the first round hole is smaller than that of the second round hole.

In one embodiment, the number of the first pressure relief holes 20 may be smaller than the number of the second pressure relief holes 30, so that the first pressure relief holes 20 block and slow down sparks, and the second pressure relief holes 30 may increase the heat dissipation rate and may ensure that b/a is greater than or equal to 1.5 and less than or equal to 3.

In some embodiments, it is not excluded that the number of first pressure relief holes 20 may be equal to the number of second pressure relief holes 30, on the basis of ensuring 1.5. ltoreq. b/a. ltoreq.3. Alternatively, the number of the first pressure relief holes 20 may be greater than the number of the second pressure relief holes 30.

The first pressure release hole 20 is disposed on an inner surface of the exhaust space 10, and the second pressure release hole 30 is disposed on an outer surface of the exhaust space 10, so that the first pressure release hole 20 and the second pressure release hole 30 communicate the exhaust space 10 with the outside.

In some embodiments, the first pressure relief vent 20 and the second pressure relief vent 30 may be butted, for example, a centerline of the first pressure relief vent 20 and a centerline of the second pressure relief vent 30 coincide, or a centerline of the first pressure relief vent 20 and a centerline of the second pressure relief vent 30 do not coincide. The first and second pressure relief vents 20 and 30 may be provided in one solid structure.

In one embodiment, as shown in fig. 6, the relief structure 1 in the middle two blocking portions 50 may not have the first relief hole 20, and this portion is used to correspond to the frame 42, and the first relief hole 20 is disposed at a position of the relief structure 1 corresponding to the exhaust channel 12. The adjacent two exhaust passages 12 are spaced apart from each other, so that the cut-off portion of the frame 42 is not too large, thereby ensuring the strength of the frame 42.

In one embodiment, as shown in fig. 3, the pressure relief channel further comprises: the gap 51 and the gap 51 are located between the first pressure relief hole 20 and the second pressure relief hole 30, that is, the gas in the exhaust space 10 can sequentially pass through the first pressure relief hole 20, the gap 51 and the second pressure relief hole 30, so as to ensure reliable exhaust. The void 51 may be a hole structure communicating the first pressure relief hole 20 and the second pressure relief hole 30, and the void 51 may also be a cavity communicating the first pressure relief hole 20 and the second pressure relief hole 30, as shown in fig. 7 and 8. The gap 51 can be used to accommodate foreign materials and prevent the first and second pressure release holes 20 and 30 from being blocked by the materials entering from the inside or the outside.

In one embodiment, as shown in fig. 1, 2, 9 and 10, the bezel 42 includes: a main body 423, the main body 423 being connected to the bottom plate 41; a flange part 424, the flange part 424 extending downward from the body part 423 to protrude from the base plate 41; here, the mounting space 422 is formed in the body portion 423 and the flange portion 424. The flange part 424 protrudes out of the bottom plate 41, so that the flange part 424 can protect the bottom plate 41, substances such as water are prevented from entering the battery box easily, the flange part 424 plays a certain stopping role, and the flange part 424 can provide a certain installation space for the pressure relief structure 1.

In one embodiment, one mounting space 422 divides the flange portion 424 into two parts to fit the pressure relief structure 1, i.e. a part of the pressure relief structure 1 may be clamped inside the flange portion 424, thereby further achieving the fixation of the pressure relief structure 1.

For example, the flange portion 424 may be a rectangular block, and a portion of the mounting space 422 may cut the rectangular block into two parts, as shown in fig. 10, the main body portion 423 may include a beam segment 4231 and a strut segment 4232, the beam segment 4231 is disposed on the bottom plate 41, the strut segment 4232 connects the partition structure 43, and the flange portion 424 extends downward from the beam segment 4231.

In one embodiment, as shown in fig. 6 and 7, the pressure relief structure 1 includes: body member 52, body member 52 disposed within body portion 423; support member 53, support member 53 extending downwardly from body member 52, at least a portion of support member 53 being disposed within flange portion 424. The body member 52 and the supporting member 53 of the pressure relief structure 1 realize a reliable fit with the frame 42, and the body member 52 and the supporting member 53 are respectively fitted to the main body portion 423 and the flange portion 424, so that stable mounting of the pressure relief structure 1 can be ensured.

As shown in fig. 3, the bottom end of the support member 53 may be flush with the bottom end of the flange portion 424, and the outer surface of the support member 53 may be flush with the outer surface of the flange portion 424. One mounting space 422 divides the flange portion 424 into two parts, and the support member 53 is clamped inside the flange portion 424.

As shown in fig. 8, voids 51 may include a first void 511 and a second void 512.

In one embodiment, as shown in fig. 6-8, body member 52 is formed with a first void 511, and first and second pressure relief holes 20, 30 are provided on opposite sidewalls of first void 511. The first gap 511 may be a hole structure communicating the first pressure relief hole 20 and the second pressure relief hole 30, and the first gap 511 may be configured to accommodate objects such as impurities, so as to prevent the first pressure relief hole 20 and the second pressure relief hole 30 from being blocked by substances entering from the inside or the outside.

In some embodiments, the first pressure relief hole 20 is disposed on one sidewall of the first gap 511 near the inner side of the bezel 42, and the second pressure relief hole 30 is disposed on the other sidewall of the first gap 511 near the outer side of the bezel 42; wherein, the cross-sectional area of first pressure release hole 20 is less than the cross-sectional area of second pressure release hole 30 to can make first pressure release hole 20 realize the speed reduction effect to gas, and second pressure release hole 30 can realize the emission to gas again fast, with this safety scheduling problem of avoiding appearing thermal runaway and causing.

In one embodiment, as shown in fig. 6 to 8, there are a plurality of first pressure relief holes 20 and a plurality of second pressure relief holes 30; the second gap 512 is formed in the supporting member 53, and the second pressure relief hole 30 is formed in the sidewall of the second gap 512 close to the outer side of the frame 42, that is, after the gas enters the first gap 511 and the second gap 512 through the first pressure relief hole 20, the gas can be quickly exhausted through the second pressure relief hole 30.

In one embodiment, the number of the pressure relief structures 1 may be multiple, the plurality of pressure relief structures 1 are disposed on the frame 42 at intervals, the plurality of pressure relief structures 1 may be disposed around the circumferential direction of the frame 42, and the exhaust space 10 may be a circumferentially closed structure, that is, the exhaust space 10 is disposed around the battery accommodating space 40. Alternatively, the exhaust space 10 may be a circumferentially non-closed structure, for example, only one side of the battery receiving space 40 is provided with the exhaust space 10.

It should be noted that, in the above embodiment, the battery accommodating space 40 and the air discharge space 10 may be stacked one above the other. In some embodiments, the air discharge space 10 may also be disposed around the circumferential direction of the battery receiving space 40, i.e., the battery receiving space 40 and the air discharge space 10 may be disposed inside and outside.

An embodiment of the utility model also provides a battery pack which comprises the battery box body.

The battery pack comprises a battery box body, wherein the battery box body comprises a box body and a pressure relief structure 1, and the pressure relief structure 1 is arranged on the box body. Pressure relief structure 1 includes pressure release main part 54 and backstop portion 50, and pressure release main part 54 sets up in the case body, and pressure release main part 54 is provided with the pressure release passageway, and the pressure release passageway can be with the inside gas outgoing of case body, and set up in cavity 421 in backstop portion 50 of pressure release main part 54 passes through the shutoff to this avoids the inside gas of case body to flow and can't in time discharge in the cavity 421, thereby improves the pressure relief ability of battery box, avoids appearing the safety problem.

In one embodiment, the battery pack further includes a battery including a cell and an electrolyte, a minimum unit capable of performing an electrochemical reaction such as charging/discharging. The battery cell refers to a unit formed by winding or laminating a stack including a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. Wherein the polarities of the first electrode and the second electrode can be interchanged. The battery core is arranged in the battery shell. The battery is adapted to be disposed in the battery receiving space 40.

As shown in fig. 11, a plurality of batteries may be formed into the battery module 2 and then disposed in the battery case, and the plurality of batteries may be fixed by end plates and side plates. A plurality of batteries can directly set up in the battery box, need not to pack a plurality of batteries promptly, and at this moment, can get rid of end plate and curb plate.

An embodiment of the present invention further provides a pressure relief structure, as shown in fig. 6 to 8, the pressure relief structure 1 includes: a pressure relief body 54, the pressure relief body 54 being provided with a pressure relief passage; the stopping portion 50, the stopping portion 50 is disposed on the pressure relief main body 54, and an included angle between the stopping portion 50 and the pressure relief main body 54 is greater than 0 degree and smaller than 180 degrees.

The pressure relief structure 1 of one embodiment of the present invention includes a pressure relief main body 54 and a stopper portion 50, the stopper portion 50 is disposed on the pressure relief main body 54, the pressure relief main body 54 is provided with a pressure relief channel, the pressure relief channel can exhaust gas inside the battery box, and the stopper portion 50 disposed on the pressure relief main body 54 can be used for plugging the hollow cavity 421 of the battery box, so as to prevent the gas inside the battery box from flowing into the hollow cavity 421 and being unable to be exhausted in time, thereby improving the pressure relief capability of the battery box and avoiding safety problems.

It should be noted that, an included angle between the stopping portion 50 and the pressure releasing main body 54 is greater than 0 degree and smaller than 180 degrees, so that the pressure releasing main body 54 can be reliably mounted on the case body of the battery case, and the stopping portion 50 can be ensured to reliably block the hollow cavity 421 of the battery case, thereby ensuring the pressure releasing capability of the pressure releasing structure 1.

In one embodiment, the angle between the stop 50 and the pressure relief body 54 may be approximately 90 degrees, for example, the stop 50 may be a plate attached to a substantially planar face of the pressure relief body 54, the plate being substantially perpendicular to the face of the pressure relief body 54.

In one embodiment, the pressure relief body 54, as shown in fig. 6 and 7, includes a body member 52 and a support member 53, the support member 53 extending downwardly from the body member 52. The stopping portion 50 is disposed on the body member 52, and an included angle between the stopping portion 50 and the body member 52 is greater than 0 degree and smaller than 180 degrees.

The pressure relief channel may include a first pressure relief vent 20, a second pressure relief vent 30, and a void 51.

In one embodiment, as shown in FIG. 8, body member 52 is formed with a first void 511, with first and second pressure relief holes 20, 30 being provided on opposite sidewalls of first void 511. The first gap 511 may be a hole structure communicating the first pressure relief hole 20 and the second pressure relief hole 30, and the first gap 511 may be configured to accommodate objects such as impurities, so as to prevent the first pressure relief hole 20 and the second pressure relief hole 30 from being blocked by substances entering from the inside or the outside.

As shown in fig. 8, the supporting member 53 is formed with a second gap 512, and a second pressure relief hole 30 is formed on a side wall of the second gap 512 close to the outer side of the bezel 42, that is, after the gas enters the first gap 511 and the second gap 512 through the first pressure relief hole 20, the gas can be quickly exhausted through the second pressure relief hole 30.

As shown in fig. 6, body member 52 can include a first U-shaped structure 521, and two first plates 522 that close off opposite ends of first U-shaped structure 521, such that body member 52 defines first void 511. The supporting member 53 may include a second U-shaped structure 531, and two second plate bodies 532 sealed at opposite ends of the second U-shaped structure 531, so that the supporting member 53 forms the second gap 512. First void 511 is larger than second void 512. The first gap 511 communicates with the second gap 512.

In one embodiment, the pressure relief body 54 is a one-piece structure, which not only has high structural stability, but also can improve the structural molding efficiency. Body member 52 and support member 53 are of unitary construction, e.g., bent through a flat plate construction, to form a pressure relief body 54.

It should be noted that, the pressure relief structure 1 in this embodiment may be used to be installed on a case body of a battery case, and for other structures of the pressure relief structure 1, reference may be made to the specific structure of the pressure relief structure 1 in the battery case, which is not limited herein. Of course, the specific structure of the pressure relief structure 1 in the battery box can also refer to the structure of the pressure relief structure 1 in this embodiment.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and example embodiments be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. The utility model provides a battery box, its characterized in that, includes case body and pressure relief structure (1), pressure relief structure (1) set up in the case body, the case body is including well cavity (421), pressure relief structure (1) includes:

the pressure relief main body (54), the pressure relief main body (54) is arranged on the box body, and the pressure relief main body (54) is provided with a pressure relief channel;

the stopping part (50), the stopping part (50) is arranged on the pressure relief main body (54) to seal the hollow cavity (421).

2. The battery box of claim 1, wherein the box body further comprises:

a base plate (41);

the frame (42) surrounds the bottom plate (41), and the hollow cavity (421) is formed in the frame (42).

3. The battery box of claim 2, wherein the box body further comprises:

the separation structure (43) is arranged in the frame (42) to form a battery accommodating space (40) and an exhaust space (10) on the upper side and the lower side of the separation structure (43), and gas in the battery accommodating space (40) can be collected to the exhaust space (10) through the separation structure (43) and exhausted;

wherein the blocking portion (50) prevents the hollow cavity (421) from communicating with the exhaust space (10).

4. A battery box according to claim 3, characterised in that the air-venting space (10) comprises:

a main cavity (11), the main cavity (11) being superposed with the battery housing space (40);

a gas exhaust passage (12), the gas exhaust passage (12) being located at the side of the main cavity (11), the gas exhaust passage (12) communicating with the main cavity (11), and gas in the battery housing space (40) being able to pass through the main cavity (11) and the gas exhaust passage (12) in sequence and be exhausted;

wherein the frame (42) forms the exhaust passage (12), and the stopping part (50) prevents the hollow cavity (421) from being communicated with the exhaust passage (12).

5. The battery case according to claim 4, wherein the stopper portions (50) are at least two, and the frame (42) forms at least two of the vent passages (12).

6. The battery box according to any one of claims 3 to 5, wherein the pressure relief channel comprises:

a plurality of first pressure relief holes (20), the first pressure relief holes (20) being provided in an inner surface of the exhaust space (10) to communicate with the exhaust space (10);

a plurality of second pressure relief holes (30), the second pressure relief holes (30) being disposed on an outer surface of the exhaust space (10) and communicating with the first pressure relief holes (20);

wherein the cross-sectional area of the first pressure relief hole (20) is smaller than the cross-sectional area of the second pressure relief hole (30).

7. The battery box of claim 6, wherein the pressure relief channel further comprises:

a void (51), the void (51) being located between the first pressure relief vent (20) and the second pressure relief vent (30).

8. A battery pack characterized by comprising the battery case according to any one of claims 1 to 7.

9. A pressure relief structure, comprising:

the pressure relief device comprises a pressure relief main body (54), wherein the pressure relief main body (54) is provided with a pressure relief channel;

the pressure relief structure comprises a stopping part (50), wherein the stopping part (50) is arranged on the pressure relief main body (54), and an included angle between the stopping part (50) and the pressure relief main body (54) is larger than 0 degree and smaller than 180 degrees.

10. The pressure relief structure of claim 9 wherein said pressure relief body (54) is a one-piece structure.

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