CN216720114U

CN216720114U - Battery pack

Info

Publication number: CN216720114U
Application number: CN202220269604.6U
Authority: CN
Inventors: 蒋昕玮; 许博伟
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-02-10
Filing date: 2022-02-10
Publication date: 2022-06-10
Anticipated expiration: 2032-02-10

Abstract

The utility model relates to the technical field of batteries, and provides a battery pack which comprises a battery box body and a battery, wherein the battery is arranged in the battery box body, the battery comprises a pressure relief structure, the battery box body comprises an avoiding groove, at least part of the pressure relief structure is positioned in the avoiding groove, and a gap is formed between the pressure relief structure and the bottom wall of the avoiding groove. Through the at least part of with pressure release structure be located the battery box avoid the inslot, and pressure release structure and the diapire of avoiding the groove between have the clearance, not only can avoid the diapire to block pressure release structure and explode, and can reduce the battery and have the distance between one side of pressure release structure and the battery box to can improve the inside space utilization of battery box, with this performance that improves the battery package.

Description

Battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack.

Background

Among the correlation technique, the inside battery of battery package needs in time release inside gas under the condition of thermal runaway, can reliably break away from the battery in order to guarantee the pressure release structure of battery, and the battery has one side of pressure release structure and can have great distance between the battery box to can reduce the inside space utilization of battery box.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery pack to improve the performance of the battery pack.

The utility model provides a battery pack which comprises a battery box body and a battery, wherein the battery is arranged in the battery box body, the battery comprises a pressure relief structure, the battery box body comprises an avoiding groove, at least part of the pressure relief structure is positioned in the avoiding groove, and a gap is formed between the pressure relief structure and the bottom wall of the avoiding groove.

The battery pack comprises the battery box body and the battery, and gas in the battery can be discharged through the pressure relief structure, so that the safety problem is avoided. Through the at least part of with pressure release structure be located the battery box avoid the inslot, and pressure release structure and the diapire of avoiding the groove between have the clearance, not only can avoid the diapire to block pressure release structure and explode, and can reduce the battery and have the distance between one side of pressure release structure and the battery box to can improve the inside space utilization of battery box, with this performance that improves the battery package.

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. 1A is a schematic structural view showing a battery pack according to a first exemplary embodiment;

fig. 1B is a schematic structural view showing a battery pack according to a second exemplary embodiment;

fig. 1C is a schematic structural view showing a battery pack according to a third exemplary embodiment;

fig. 1D is a schematic structural view showing a battery pack according to a fourth exemplary embodiment;

fig. 2A is a schematic structural view showing a battery pack according to a fifth exemplary embodiment;

fig. 2B is a schematic view showing a partial structure of a battery pack according to a fifth exemplary embodiment;

fig. 3 is a partial schematic diagram of a battery pack according to an exemplary embodiment;

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

FIG. 5 is a schematic diagram illustrating a structure of a battery receiving space of a battery case according to an exemplary embodiment;

FIG. 6 is a schematic diagram illustrating the configuration of the vent space of a battery case according to an exemplary embodiment;

FIG. 7 is a schematic diagram of a battery according to an exemplary embodiment;

fig. 8 is a partial structural view illustrating a battery pack according to an exemplary embodiment.

The reference numerals are explained below:

2. a heat conducting portion; 3. a battery module; 10. a battery case; 11. an avoidance groove; 111. a bottom wall; 112. a side wall; 113. a weak portion; 12. a battery accommodating space; 13. an exhaust space; 14. a base plate; 15. a frame; 16. a partition structure; 161. a circulating flow passage; 162. a first plate body; 1621. a through hole; 163. a second plate body; 17. a top cover; 20. a battery; 21. a pressure relief structure; 22. a pressure relief port.

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.

Referring to fig. 1A to 8, the battery pack includes a battery case 10 and a battery 20, the battery 20 is disposed in the battery case 10, the battery 20 includes a pressure relief structure 21, the battery case 10 includes an avoiding groove 11, at least a portion of the pressure relief structure 21 is located in the avoiding groove 11, and a gap is formed between the pressure relief structure 21 and a bottom wall 111 of the avoiding groove 11.

The battery pack according to one embodiment of the present invention includes a battery case 10 and a battery 20, and gas inside the battery 20 may be discharged through a pressure relief structure 21, thereby preventing a safety problem from occurring. Through being located the groove 11 of dodging of battery box 10 with at least part of pressure relief structure 21, and have the clearance between pressure relief structure 21 and the diapire 111 of dodging groove 11, not only can avoid diapire 111 to block pressure relief structure 21 and explode, and can reduce battery 20 and have the distance between one side of pressure relief structure 21 and the battery box 10 to can improve the inside space utilization of battery box, with this performance that improves the battery package.

It should be noted that, because at least a part of the pressure relief structure 21 is located in the avoiding groove 11, the distance between the side of the battery 20 having the pressure relief structure 21 and the battery case 10 may be relatively small, but the bursting of the pressure relief structure 21 is not affected.

It should be noted that, a gap is formed between the pressure relief structure 21 and the bottom wall 111 of the avoiding groove 11, that is, the bottom wall 111 of the avoiding groove 11 does not stop the pressure relief structure 21, and further, no other structure is arranged between the pressure relief structure 21 and the bottom wall 111 of the avoiding groove 11, but an air gap is formed, so that the pressure relief structure 21 can be reliably separated from the battery 20, thereby ensuring the pressure relief capability of the battery.

The distance between the side of the battery 20 having the pressure relief structure 21 and the battery case 10 does not include the distance between the pressure relief structure 21 and the bottom wall 111 of the avoidance groove 11, and as shown in fig. 1A, it can be considered as the distance between the bottom surface of the battery 20 and the upper surface of the partition structure 16, where the partition structure 16 can support the battery 20. Of course, the avoiding groove 11 may be disposed on the side or the top of the battery case 10, which is not limited herein, and is embodied to avoid the battery 20 from excessively increasing the internal space of the battery pack.

In some embodiments, it is not excluded that the distance between the side of the battery 20 having the pressure relief structure 21 and the battery case 10 may be 0, and as shown in fig. 1B, the distance between the bottom surface of the battery 20 and the upper surface of the partition structure 16 may be 0.

In one embodiment, as shown in fig. 2A and 2B, the battery 20 is provided with a pressure relief vent 22, and the pressure relief structure 21 shields the pressure relief vent 22; wherein, at least part of pressure relief vent 22 is located dodges the groove 11 to behind pressure relief structure 21 release pressure relief vent 22, gaseous can directly be discharged into dodge the groove 11 in, and can avoid pressure relief structure 21 to occupy the inner space of battery box 10, thereby avoid arousing the too high or overlength problem of battery box 10.

At least part of the pressure relief opening 22 is located in the avoiding groove 11, so that after the pressure relief structure 21 releases the pressure relief opening 22, gas can be directly discharged into the avoiding groove 11, thereby reducing the path of gas flow, and reducing the risk that gas is diffused to other batteries inside the battery box body 10 from the avoiding groove 11, thereby avoiding the risk that heat generated after the pressure relief of a certain battery affects other batteries.

A protrusion may be disposed on the battery 20, and the protrusion has a through hole, the port of the protrusion facing the avoiding groove 11 is a pressure relief opening 22, and the pressure relief structure 21 may be connected to the protrusion to shield the pressure relief opening 22. When the pressure or the temperature inside the battery reaches a certain value, at least part of the pressure relief structure 21 can be separated from the battery 20, so that the pressure inside the battery is relieved.

The pressure relief structure 21 can be arranged at the bottom or the top of the battery 20, at this time, the avoiding groove 11 is arranged at the top or the bottom of the battery box body, and at least part of the pressure relief structure 21 is positioned in the avoiding groove 11, so that the height space of the battery pack can not be excessively increased. The pressure relief structure 21 may be provided at a side portion of the battery 20, in which case the avoidance groove 11 is provided at a side portion of the battery case, and the width space or the length space of the battery pack may not be excessively increased.

Note that the battery 20 includes a cell and an electrolyte, and is a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The 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 case may include a case member and a cover plate, and the pressure relief structure 21 may be provided on at least one of the case member and the cover plate.

As shown in fig. 8, a plurality of batteries 20 may be formed into the battery module 3 and then disposed in the battery case 10, and the plurality of batteries 20 may be fixed by end plates and side plates. The plurality of cells 20 may be directly disposed in the cell case 10, i.e., without grouping the plurality of cells 20, and at this time, the end plates and the side plates may be removed.

The pressure relief structure 21 of the battery 20 may be a pressure relief structure in the related art, such as an explosion-proof membrane, an explosion-proof valve, etc., and is not limited herein.

In some embodiments, the avoiding groove 11 may be a through groove, that is, the avoiding groove 11 includes three openings, and in this case, the two opposite sides of the bottom wall 111 of the avoiding groove 11 are provided with the side walls 112, for example, the avoiding groove 11 is provided on a flat plate, and in this case, a recess may be formed on the flat plate, and two ends of the recess penetrate through two opposite ends of the flat plate. Alternatively, the avoidance groove 11 may be a groove, i.e. the avoidance groove 11 comprises an opening, wherein the bottom wall 111 of the avoidance groove 11 surrounds a circumferentially closed side wall 112, e.g. the avoidance groove 11 is provided on a plate, wherein the plate may be provided with a groove inside.

In one embodiment, as shown in fig. 1A and fig. 2A, the maximum distance between the pressure relief structure 21 and the bottom wall 111 of the avoiding groove 11 is a, and a is greater than or equal to 2mm and less than or equal to 10mm, so that the battery case 10 can be prevented from blocking the explosion of the pressure relief structure 21 without excessively increasing the height of the avoiding groove 11, thereby ensuring that the battery 20 can reliably relieve pressure, and ensuring the performance of the battery pack.

It should be noted that an air gap is formed between the pressure relief structure 21 and the bottom wall 111 of the avoiding groove 11, that is, the battery case 10 does not stop the pressure relief structure 21, so that the pressure relief structure 21 can be reliably separated from the battery 20, thereby ensuring the pressure relief capability of the battery.

Pressure relief structure 21 can set up in the bottom and the top of battery 20, and this moment, with pressure relief structure 21 and dodge between the diapire 111 of groove 11 maximum distance a control at 2mm to 10mm, can guarantee that pressure relief structure 21 can reliably break away from battery 20, and can avoid the battery package high space that groove 11 occupy without excessively increasing. Pressure relief structure 21 can set up the lateral part at battery 20, and this moment, with pressure relief structure 21 and dodge between the diapire 111 of groove 11 maximum distance a control at 2mm to 10mm, not only can guarantee that pressure relief structure 21 can reliably break away from battery 20, and can avoid the width space or the length space of the battery package that groove 11 occupy with excessive increase.

The distance between the pressure relief structure 21 and the bottom wall 111 of the avoidance groove 11 can be considered as the value of the distance between two points of the pressure relief structure 21 directly opposite the bottom wall 111, as in the embodiment shown in fig. 1A and 2A. The maximum distance a between the pressure relief structure 21 and the bottom wall 111 is controlled to be 2mm to 10mm, so that it is not excluded that a distance value with a minimum distance of 0 exists between the pressure relief structure 21 and the bottom wall 111, that is, a plurality of distance values between the pressure relief structure 21 and the bottom wall 111 may not be consistent, but the maximum distance value is ensured to be 2mm to 10mm, so as to ensure that at least part of the pressure relief structure 21 can be separated from the battery 20.

It is noted that the pressure relief structure 21 is capable of being disengaged from the battery 20, and may be considered as at least part of the pressure relief structure 21 being disengaged from the battery 20, i.e. a part of the pressure relief structure 21 being disengaged from the battery 20, or alternatively, all of the pressure relief structure 21 being disengaged from the battery 20. For example, if the pressure relief structure 21 is broken from the middle portion thereof, and the pressure relief structure 21 also releases the gas inside the battery 20, the pressure relief structure 21 may be considered to be separated from the battery 20.

In one embodiment, a is more than or equal to 4mm and less than or equal to 7mm, so that the pressure relief structure 21 is convenient to burst, gas is quickly sprayed out of the battery when thermal runaway occurs, energy density can be considered, and the space of the battery pack is not excessively occupied.

In some embodiments, the maximum distance a between the pressure relief structure 21 and the bottom wall 111 may be 2mm, 2.5mm, 3mm, 3.5mm, 3.8mm, 3.9mm, 4mm, 4.2mm, 4.8mm, 5mm, 5.5mm, 6mm, 6.5mm, 6.8mm, 6.9mm, 7mm, 7.2mm, 7.5mm, 7.8mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, and so forth.

In one embodiment, the exhaust gas from the battery 20 can escape through the bypass channel 11 to provide reliable venting of the battery pack. The avoidance groove 11 may be used for gas collection so that gas can be rapidly discharged out of the battery pack, thereby avoiding various safety problems from being caused.

It should be noted that the gas discharged from the battery 20 can be discharged through the avoiding groove 11, that is, if the original structure of the avoiding groove 11 does not have a structure such as a vent hole, the avoiding groove 11 needs to be disabled by the gas discharged from the battery 20, so as to achieve the gas discharge.

In one embodiment, as shown in fig. 1A to 3, at least one of the bottom wall 111 and the side wall 112 of the avoiding groove 11 includes a weak portion 113, so that the weak portion 113 can be timely broken by the gas entering the avoiding groove 11, thereby achieving the effect of pressure relief. The pressure relief structure 21 is directly opposite to the avoiding groove 11, so that the gas can break the weak part 113, the heat can be rapidly discharged, and the safety is improved.

The weak portion 113 may be a valve body that is opened when the pressure reaches a certain value, thereby discharging the gas. The weakened portion 113 may resemble an explosion-proof structure, for example an explosion-proof valve, which may be breached when the pressure reaches a certain value. The weak portion 113 may be a structure having a relatively low strength, such as a thin aluminum plate, and may be broken when the pressure reaches a certain value, and the weak portion 113 may be a notch, as long as the relatively low strength is achieved.

It should be noted that the avoiding groove 11 may be provided at the bottom, top or side of the battery case 10 to match the position of the pressure relief structure 21.

In some embodiments, it is not excluded that the battery case 10 is provided with no escape groove 11 for discharging gas discharged from the battery, for example, the escape groove 11 is provided at the bottom of the battery case 10, and the weak portion 113 may be provided at a side portion of the battery case 10, or the like.

In one embodiment, as shown in fig. 1A to 2B, the battery case 10 further includes a battery accommodating space 12 and an exhaust space 13, the battery 20 is disposed in the battery accommodating space 12, and gas exhausted from the battery 20 can be exhausted through the exhaust space 13, so that the gas can be prevented from being collected in the battery accommodating space 12 to cause a safety problem.

In one embodiment, as shown in fig. 1A to 2B, the battery housing space 12 and the air discharge space 13 have a weak portion 113 therebetween; the gas discharged from the battery 20 can be collected in the exhaust space 13 through the weak portion 113 and discharged. The battery accommodating space 12 is used for accommodating the battery 20, the exhaust space 13 is used for exhausting gas in time, and after the weak portion 113 is broken, the battery accommodating space 12 and the exhaust space 13 are communicated to exhaust gas.

In one embodiment, as shown in fig. 4 to 6, the battery case 10 further includes: a base plate 14; a frame 15, wherein the frame 15 is arranged around the bottom plate 14; a partition structure 16, the partition structure 16 being disposed within the frame 15 to form the battery receiving space 12 and the exhaust space 13; the separating structure 16 is provided with the avoiding groove 11, so that the separating structure 16 can accommodate and avoid the pressure relief structure 21, and the problem of waste of the internal space of the battery box caused by the small battery is solved.

It should be noted that the frame 15 is not specifically referred to as being disposed around the bottom plate 14, and it is important to note that the frame 15 forms a circumferentially closed space. The frame 15 is connected to the bottom plate 14, and the frame 15 may be disposed on the bottom plate 14, or the frame 15 may be connected to a circumferential edge of the bottom plate 14, and the top cover 17 is connected to the frame 15 and disposed opposite to the partition structure 16, so that the battery case 10 may form a closed space.

The bottom plate 14 and the frame 15 form a large cavity, and the partition structure 16 can divide the large cavity into an upper part and a lower part, namely the battery accommodating space 12 and the exhaust space 13. The bottom plate 14 may be used to shield the bottom of the battery case, and the specific structure of the bottom plate 14 is not limited. The frame 15 is connected to the bottom plate 14, and the frame 15 may be formed by splicing a plurality of beam members, or the frame 15 may be an integral plate-shaped structure to enclose a circumferential closed space.

At least one of the bottom plate 14 and the frame 15 is provided with an exhaust through hole, so that the gas in the exhaust space 13 can be exhausted in time. The inside of the exhaust through hole may not be provided with other structures, and at this time, the exhaust space 13 may be directly connected to the outside through the exhaust through hole.

In one embodiment, as shown in fig. 1A to 2B, the battery accommodating space 12 and the air discharge space 13 are stacked one on top of the other, i.e., the upper and lower sides of the partition structure 16 form the battery accommodating space 12 and the air discharge space 13, so that the battery 20 is positioned above the air discharge space 13.

In some embodiments, it is not excluded that the upper and lower sides of the partition structure 16 form the air discharge space 13 and the battery housing space 12.

In some embodiments, the left and right sides of the partition structure 16 form the battery receiving space 12 and the air discharge space 13. At this time, the air discharge space 13 may be provided around the circumference of the battery receiving space 12, i.e., the air discharge space 13 is provided around the battery receiving space 12. Alternatively, the air discharge space 13 may be only a part of the circumference of the battery accommodating space 12, for example, the battery accommodating space 12 may be a rectangular space, and in this case, the air discharge space 13 may be located on at least one of four outer sides of the rectangular space in the circumference direction, so that the air in the battery accommodating space 12 can enter the air discharge space 13 from the side portion thereof, thereby achieving the pressure relief through the air discharge space 13.

In one embodiment, the partition structure 16 may include a weak portion 113, so as to ensure that the gas in the battery receiving space 12 can be discharged into the exhaust space 13 to be decompressed by breaking the weak portion 113. The weak portion 113 may be located on the escape groove 11 formed by the partition structure 16, or the weak portion 113 may be located outside the escape groove 11 of the partition structure 16.

The weak portion 113 and the partition structure 16 may be separate two structures, and the weak portion 113 and the partition structure 16 may be bonded or welded. In some embodiments, the weakened portion 113 and at least a portion of the partition structure 16 may also be integrally formed structures.

In one embodiment, as shown in FIG. 3, the partition structure 16 includes: the weak portion 113; a first plate 162, the first plate 162 having a through hole 1621 formed therein; a second plate 163, the second plate 163 being disposed opposite to the first plate 162, the weak portion 113 being disposed on the second plate 163; wherein, the second plate 163 and the weak portion 113 form an avoiding groove 11, the pressure relief structure 21 passes through the through hole 1621 and is located in the avoiding groove 11, and the gas exhausted from the battery 20 can be collected into the exhaust space 13 through the weak portion 113 and exhausted, so that it can be ensured that the gas exhausted from the battery can be collected into the exhaust space 13 through the weak portion 113 and exhausted. The arrangement of the second plate 163 and the first plate 162 may increase the structural strength of the partition structure 16, thereby reliably supporting the battery 20.

The pressure relief structure 21 passes through the through hole 1621 and is located in the avoiding groove 11, that is, after the pressure relief structure 21 releases the pressure relief opening 22, the gas inside the battery can directly enter the avoiding groove 11, so that the gas can be rapidly collected in the avoiding groove 11, and the weak part 113 can be rapidly broken and collected in the exhaust space 13 to be discharged.

In one embodiment, as shown in fig. 3, the partition structure 16 includes a circulation flow channel 161 so that the partition structure 16 can be used to achieve heating or cooling of the battery. The circulation channel 161 may be a fluid heat exchange channel, and the circulation channel 161 may also be a gas heat exchange channel, so as to cool or heat the battery inside the battery box.

As shown in fig. 3, a circulation flow path 161 is formed between the second plate 163 and the first plate 162, so that the battery 20 can be reliably heated or cooled. The pressure relief structure 21 is located in the avoiding groove 11 through the through hole 1621.

The first plate 162 may be provided with a through hole 1621 and the weak portion 113 may be connected to the second plate 163, for example, a mounting through hole may be provided on the second plate 163 and the weak portion 113 is connected to the second plate 163 to shield the mounting through hole, and the weak portion 113 may burst from the middle. Or the weak portion 113 may be separated from the battery 20 from the position where it is connected with the second plate body 163. Alternatively, the weak portion 113 may be formed as an integral structure with the second plate 163, and the strength of the weak portion 113 may be relatively weak, thereby facilitating the pop-up. A plurality of weak portions 113 may be mounted on the second plate body 163.

In one embodiment, as shown in fig. 1C and 3, the battery 20 and the separation structure 16 may have a certain distance value therebetween; wherein, a heat conducting part 2 is arranged between the battery 20 and the separating structure 16, and the heat conducting part 2 exposes the pressure relief structure 21, so that the separating structure 16 can reliably radiate or heat the battery 20.

The heat conduction part 2 may be a glue layer, which not only allows the separation structure 16 to reliably dissipate or heat the battery 20, but also may be used to connect the separation structure 16 and the battery 20, thereby ensuring the stability of the battery 20.

The heat conducting part 2 may include ultra-high temperature heat conducting glue, silicone heat conducting glue, epoxy AB glue, polyurethane heat conducting and electric conducting glue, heat conducting silicone grease, and the like.

In some embodiments, the battery 20 may be in direct contact with the separating structure 16, and due to the presence of the avoiding groove 11, a reliable avoidance of the pressure relief structure 21 may also be achieved, and the height space of the battery pack may be further reduced.

In one embodiment, as shown in fig. 1A and 2A, the escape groove 11 may communicate with at least a portion of the battery receiving space 12.

In one embodiment, the avoiding groove 11 may not be communicated with at least a portion of the battery accommodating space 12, so that after the gas inside the battery enters the avoiding groove 11, the gas inside the avoiding groove 11 may be prevented from diffusing into the battery accommodating space 12, and the weak portion 113 is rapidly broken to realize pressure relief, thereby preventing a thermal runaway battery from causing heat diffusion to other batteries.

As shown in fig. 1B, the avoiding groove 11 may not be communicated with the battery accommodating space 12, and the battery 20 may be in direct contact with the separating structure 16, so as to plug the port of the avoiding groove 11, so that the avoiding groove 11 may not be communicated with the battery accommodating space 12, so as to allow the gas discharged from the inside of the battery to directly enter the avoiding groove 11, so as to rapidly burst the weak portion 113 to implement pressure release, and to effectively prevent the gas from diffusing into the battery accommodating space 12.

As shown in fig. 1C, the heat conduction portion 2 may be disposed between the battery 20 and the partition structure 16 to avoid the communication between the avoiding groove 11 and the battery accommodating space 12, the heat conduction portion 2 is located in the battery accommodating space 12, and the gap between the heat conduction portions 2 belongs to a portion of the battery accommodating space 12, so that it can be considered that a portion of the battery accommodating space 12 is not communicated with the avoiding groove 11, but the diffusion of the gas in the avoiding groove 11 into the battery accommodating space 12 can be reduced.

As shown in fig. 1D, one side of the battery 20 facing the avoiding groove 11 may be provided with a protrusion structure, and the protrusion structure may block the port of the avoiding groove 11, for example, the protrusion structure may include a pressure relief structure 21, and the pressure relief structure 21 has a certain thickness, a part of the pressure relief structure 21 is located in the avoiding groove 11, and another part may realize blocking the port of the avoiding groove 11, but it is required to ensure that the normal burst of the pressure relief structure 21 is not affected.

In one embodiment, the thickness of the bottom wall 111 of the avoiding groove 11 is b, and b is greater than or equal to 0.4mm and less than or equal to 1.5mm, so that the bottom wall 111 of the avoiding groove 11 can be broken, reliable pressure relief of the battery pack is guaranteed, and safety performance of the battery pack is improved.

It should be noted that the partition structure 16 includes a weak portion 113, the bottom wall 111 of the avoidance groove 11 includes the weak portion 113, and the thickness of the weak portion 113 may be b. Other structures of the partition structure 16 to which the weak portion 113 is connected may be an integrated structure, for example, a plate structure is subjected to a process of thinning or the like to thereby form the weak portion 113. Alternatively, the other structure of the partition structure 16 to which the weak portion 113 is connected may be a separately molded structure.

In some embodiments, the thickness b of the bottom wall 111 of the avoidance slot 11 may be 0.4mm, 0.45mm, 0.5mm, 0.8mm, 1mm, 1.1mm, 1.4mm, 1.45mm, 1.5mm, and the like.

In one embodiment, as shown in fig. 7, the thickness of the battery 20 is c, and c/a is not less than 2.5, and the pressure relief structure 21 can be reliably separated from the battery 20 by controlling the thickness of the battery 20 and the distance between the pressure relief structure 21 and the battery case 10, so as to ensure a stable pressure relief effect.

In one embodiment, as shown in fig. 7, the thickness of the battery 20 is c, the maximum width of the pressure relief structure 21 in the thickness direction of the battery 20 is d, and c/d is less than or equal to 2, and the pressure relief structure 21 can be reliably separated from the battery 20 by controlling the thickness of the battery 20 and the size relationship of the pressure relief structure 21, so as to ensure a stable pressure relief effect.

It should be noted that, as shown in fig. 7, the thickness of the battery 20 can be regarded as the width dimension of the battery, and the maximum width d of the corresponding pressure relief structure 21 in the thickness direction of the battery 20 can also be understood in conjunction with fig. 6.

In one embodiment, the capacity range of the battery 20 may be 50Ah-280Ah, the maximum distance between the pressure relief structure 21 and the bottom wall 111 is a, a is greater than or equal to 2mm and less than or equal to 10mm, the thickness of the bottom wall 111 of the avoiding groove 11 is b, b is greater than or equal to 0.4mm and less than or equal to 1.5mm, the thickness of the battery 20 is c, c/a is greater than or equal to 2.5, the maximum width of the pressure relief structure 21 in the thickness direction of the battery 20 is d, and c/d is less than or equal to 2, so as to ensure that the pressure relief structure 21 can be reliably damaged, thereby ensuring the pressure relief capacity of the battery pack, and improving the safety performance of the battery pack.

In some embodiments, the capacity of the battery 20 may range from 72Ah to 172 Ah. The capacity of the battery 20 may be 50Ah, 60Ah, 70Ah, 71Ah, 72Ah, 75Ah, 80Ah, 100Ah, 120Ah, 150Ah, 160Ah, 161Ah, 162Ah, 165Ah, 168Ah, 170Ah, 172Ah, 180Ah, 200Ah, 250Ah, 280Ah, etc.

It should be noted that the battery case 10 may include only the battery housing space 12, that is, the battery case 10 may not include the air discharge space 13.

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

1. The utility model provides a battery pack, its characterized in that, includes battery box (10) and battery (20), battery (20) set up in battery box (10), battery (20) are including pressure relief structure (21), battery box (10) are including dodging groove (11), at least part of pressure relief structure (21) is located dodge in groove (11), just pressure relief structure (21) with it has the clearance to dodge between diapire (111) of groove (11).

2. The battery pack according to claim 1, wherein the battery (20) is provided with a pressure relief vent (22), the pressure relief structure (21) covering the pressure relief vent (22);

wherein at least part of the pressure relief opening (22) is located in the avoidance groove (11).

3. The battery pack according to claim 1 or 2, wherein the maximum distance between the pressure relief structure (21) and the bottom wall (111) of the avoidance groove (11) is a, 2mm ≦ a ≦ 10 mm.

4. The battery pack of claim 3, wherein a is 4mm ≦ 7 mm.

5. A battery pack according to claim 1 or 2, wherein at least one of the bottom wall (111) and the side wall (112) of the avoiding groove (11) comprises a weak portion (113), and gas exhausted inside the battery (20) can pass through the weak portion (113) and be exhausted.

6. The battery pack according to claim 1 or 2, wherein the battery case (10) further includes a battery receiving space (12) and a gas exhaust space (13), the battery (20) being disposed in the battery receiving space (12), and gas exhausted from the battery (20) being able to be exhausted through the gas exhaust space (13).

7. The battery pack according to claim 6, wherein the battery housing space (12) and the air discharge space (13) are stacked one on top of the other.

8. The battery pack according to claim 6, wherein the battery case (10) further comprises:

a base plate (14);

a frame (15), the frame (15) being disposed around the base plate (14);

a partition structure (16), the partition structure (16) being provided within the frame (15) to form the battery housing space (12) and the exhaust space (13);

wherein the separation structure (16) is formed with the avoidance groove (11).

9. Battery pack according to claim 8, characterized in that the separating structure (16) comprises:

a weakened portion (113);

a first plate (162), the first plate (162) having a through hole (1621) formed therein;

a second plate (163), wherein the second plate (163) is arranged opposite to the first plate (162), and the weak portion (113) is arranged on the second plate (163);

wherein, the second plate body (163) with weak part (113) forms dodge groove (11), pressure relief structure (21) pass through-hole (1621) is located dodge in groove (11), the gas of exhaust can pass through in battery (20) weak part (113) is collected extremely discharge in exhaust space (13).

10. Battery pack according to claim 6, characterized in that at least part of the battery receiving space (12) is not in communication with the avoidance groove (11).