CN219717079U - Bottom guard plate assembly of battery pack and battery pack - Google Patents

Abstract

The utility model discloses a bottom guard plate assembly of a battery pack and the battery pack, wherein the battery pack comprises a box body and a battery module positioned in the box body, the battery module comprises a battery core, an explosion-proof valve is arranged at the bottom of the battery core, and the bottom guard plate assembly comprises: a bottom guard adapted to be connected to a bottom of the tank; the buffering protection component is connected to one side, facing the battery module, of the bottom protection plate, the buffering protection component is opposite to the bottom of the battery cell and is kept away from the explosion-proof valve, and the buffering protection component is suitable for being pressed against the bottom of the battery cell when being pressed. According to the bottom guard plate assembly of the battery pack, the bottom guard plate is arranged at the bottom of the battery pack, and the buffer protection piece is arranged on the bottom guard plate, so that the buffer protection piece has good impact resistance and energy absorption effects, the impact resistance and the structural strength of the battery pack are improved, and the protection of the explosion-proof valve is further realized.

Description

Bottom guard plate assembly of battery pack and battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a bottom guard plate assembly of a battery pack and the battery pack with the bottom guard plate assembly.

Background

With the concern of safety performance and energy, the safety performance of the battery pack is increasingly important, so that the structural design of the battery pack directly affects the overall safety performance of the battery pack. In the design of the battery pack in the prior art, the battery pack mainly comprises the design that the electrode column of the battery core faces upwards and the explosion-proof valve faces upwards, or the design that the electrode column of the battery core faces one side or two sides and the explosion-proof valve and the electrode column face the same side. However, the above design is not perfect for improving the energy density of the whole package and the thermal runaway of the battery cell, and the structural strength is general, so there is room for improvement.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the bottom guard plate assembly of the battery pack, which can improve the protection performance of the battery pack and improve the structural strength and the impact resistance of the battery pack.

According to the bottom guard plate assembly of the battery pack, which is disclosed by the embodiment of the utility model, the battery pack comprises a box body and a battery module arranged in the box body, the battery module comprises a battery core, an explosion-proof valve is arranged at the bottom of the battery core, and the bottom guard plate assembly comprises: a bottom guard adapted to be connected to a bottom of the tank; the buffering protection component is connected to one side, facing the battery module, of the bottom protection plate, the buffering protection component is opposite to the bottom of the battery cell and is kept away from the explosion-proof valve, and the buffering protection component is suitable for being pressed against the bottom of the battery cell when being pressed.

According to the bottom guard plate assembly of the battery pack, the bottom guard plate is arranged at the bottom of the battery pack, and the buffer protection piece is arranged on the bottom guard plate, so that the buffer protection piece has good impact resistance and energy absorption effects, the impact resistance and the structural strength of the battery pack are improved, and the protection of the explosion-proof valve is further realized.

According to the bottom guard plate assembly of the battery pack, the buffer protection assembly comprises a buffer structure and a first insulating piece, the buffer structure is connected with the bottom guard plate, the first insulating piece is suitable for being connected to the bottom of the battery cell and avoiding the explosion-proof valve, and the buffer structure is suitable for compressing the first insulating piece when being compressed.

According to the bottom guard plate assembly of the battery pack, the buffer structure comprises the buffer protection piece and the connecting plate, the buffer protection piece is relatively fixed with the bottom guard plate, the connecting plate is connected to one side, away from the bottom guard plate, of the buffer protection piece, and the connecting plate is suitable for being in pressing contact with the first insulating piece.

According to the bottom guard plate assembly of the battery pack, the buffer protection assembly further comprises a second insulating piece, and the second insulating piece is connected between the buffer protection piece and the bottom guard plate.

According to the bottom guard plate assembly of the battery pack, the buffer structure of the buffer protection assembly is divided into two groups, and the two groups of buffer protection pieces are connected with the bottom guard plate through the same second insulating piece; the two groups of buffer protection pieces are respectively positioned at two sides of the explosion-proof valve and are respectively arranged corresponding to the first insulating pieces positioned at two sides of the explosion-proof valve.

The bottom guard plate assembly of the battery pack according to the embodiment of the utility model further comprises a buffer support, wherein the buffer support is connected to one side of the bottom guard plate, which faces the battery module, and is spaced from the buffer protection assembly, and the buffer support is suitable for being pressed against the end part of the battery cell.

According to the bottom guard plate assembly of the battery pack, two groups of buffer supporting pieces are arranged, and the two groups of buffer supporting pieces are respectively positioned on two sides of the buffer protection assembly.

According to the bottom guard plate assembly of the battery pack, the bottom guard plate is provided with the mounting boss protruding towards the battery module, the buffer support piece is mounted on the mounting boss, and the thickness of the buffer support piece is smaller than that of the buffer protection component.

According to the bottom guard plate assembly of the battery pack, a protective coating is arranged on one side, away from the battery module, of the bottom guard plate.

The utility model also provides a battery pack.

The battery pack comprises a liquid cooling plate, a box body, a battery module and a bottom guard plate assembly of the battery pack, wherein the battery module is installed in the box body, the bottom guard plate assembly is installed at the bottom of the box body, the liquid cooling plate is installed at the top of the box body, and a sealing piece is arranged between the liquid cooling plate and the box body.

The battery pack and the bottom guard plate assembly of the battery pack described above have the same advantages over the prior art and are not described in detail herein.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of the bottom shield assembly of a battery pack according to an embodiment of the present utility model;

fig. 2 is a schematic structural view of a bottom guard plate assembly (another view) of a battery pack according to an embodiment of the present utility model;

FIG. 3 is an enlarged view at A in FIG. 2;

fig. 4 is a schematic structural view of a battery pack according to an embodiment of the present utility model.

Reference numerals:

the bottom shield assembly 100,

the bottom guard plate 1, the mounting boss 11, the buffer protection assembly 2, the buffer structure 21, the buffer protection 211, the connection plate 212, the air holes 2121, the first insulator 22, the second insulator 23, the buffer support 3, the protective coating 5, the air flow channel 6,

the battery pack comprises a case 200, a battery module 300, a liquid cooling plate 400, a sealing member 500, a heat conductive structural adhesive 600,

battery pack 1000.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1 to 4, a bottom guard plate assembly 100 of a battery pack 1000 according to an embodiment of the present utility model is described, the battery pack 1000 includes a case 200 and a battery module 300 positioned in the case 200, the battery module 300 includes a battery cell, and an explosion-proof valve is provided at the bottom of the battery cell. That is, the battery pack 1000 is used to house the battery module 300, and the bottom guard assembly 100 is disposed at the bottom of the case 200 of the battery pack 1000 to provide protection to the battery module 300. Meanwhile, the battery module 300 of the embodiment sets the explosion-proof valve at the bottom of the battery cell, so that the explosion-proof valve is set towards one side of the bottom guard plate 1, and therefore, when thermal runaway occurs in the battery cell in the battery pack 1000, the gas generated by the thermal runaway can be discharged under the action of the bottom guard plate 1, and the safety of the battery pack 1000 is improved.

Specifically, as shown in FIG. 1, the bottom shield assembly 100 includes: a bottom guard 1 and a buffer protection assembly 2. It should be noted that, as shown in fig. 1, the bottom guard plate 1 is configured as a rectangular plate with a size similar to that of the end face of the case 200, and the surface structure of the bottom guard plate 1 may be adapted to the end face structure of the case 200, so that the bottom guard plate 1 is mounted at the bottom of the case 200 in a more fitting manner, thereby being beneficial to providing protection to the side of the case 200 close to the outside.

The bottom guard plate 1 may be made of a metal material and a non-metal material, so that compared with a metal material or other high-strength composite materials, the bottom guard plate 1 of the present embodiment is lighter in weight, and has both the strength of the metal and the elasticity of the non-metal material, so as to satisfy the impact resistance and structural strength test of the bottom guard plate 1. Meanwhile, the plastic can be manufactured by simple and efficient processes such as mould pressing, injection molding and the like, and has low cost and low processing difficulty.

And the buffer protection component 2 is connected to one side of the bottom guard plate 1 facing the battery module 300, the buffer protection component 2 is opposite to the bottom of the battery cell and is kept away from the explosion-proof valve, and the buffer protection component 2 is suitable for being pressed against the bottom of the battery cell when being pressed.

That is, as shown in fig. 3, the buffer protection assembly 2 is disposed between the bottom protection plate 1 and the battery module 300 and fixedly connected with the bottom protection plate 1, and the buffer protection assembly 2 can be made of a special material and has good impact resistance and energy absorption performance. Specifically, the buffer protection assembly 2 is arranged on the bottom guard plate 1, and the buffer protection assembly 2 is guaranteed to avoid the explosion-proof valve at the bottom of the battery cell, so that the explosion-proof valve is prevented from being covered. Therefore, when the battery pack 1000 is impacted by the outside, the buffer protection assembly 2 can effectively absorb the impact force, so that the battery cell and the explosion-proof valve are protected, and the whole battery module 300 is protected.

It can be appreciated that the bottom guard plate assembly 100 according to the embodiment of the present utility model greatly improves the stress performance, the impact resistance and the shock resistance of the battery pack 1000 by providing the buffer protection assembly 2.

According to the bottom guard plate assembly 100 of the battery pack 1000, the bottom guard plate 1 is arranged at the bottom of the battery pack 1000, and the buffer protection piece 211 is arranged on the bottom guard plate 1, so that the buffer protection piece 211 has good impact resistance and energy absorption effects, the impact resistance and the structural strength of the battery pack 1000 are improved, and the protection of an explosion-proof valve is further realized.

In some embodiments, the buffer protection assembly 2 comprises a buffer structure 21 and a first insulating member 22, the buffer structure 21 is connected to the bottom guard 1, the first insulating member 22 is adapted to be connected to the bottom of the cell and to be kept away from the explosion-proof valve, and the buffer structure 21 is adapted to compress the first insulating member 22 when compressed.

It should be noted that, as shown in fig. 1, the first insulating member 22 is made of a strip-shaped mica sheet, one surface of the first insulating member is connected to the buffer structure 21, and the other surface of the first insulating member is connected to the bottom of the battery cell, so that the fireproof heat-insulating performance of the buffer protection assembly 2 is enhanced by the characteristics of the mica sheet, such as insulation, high temperature resistance, heat insulation, and the like, thereby effectively improving the service life of the battery pack 1000 and overcoming the fireproof anxiety. Meanwhile, the first insulating member 22 avoids the explosion-proof valve, so that the situation that high-temperature gas cannot be dredged to the outside due to the fact that the explosion-proof valve is blocked by the first insulating member 22 is avoided, and the safety of the battery pack 1000 is improved.

And, buffer structure 21 can link to each other with end backplate 1 for can play energy-absorbing cushioning effect when battery package 1000 receives external striking, thereby guarantee to transmit the impact force of battery package 1000 and descend by a wide margin, and then play the effect of protecting battery module 300.

In some embodiments, the buffer structure 21 includes a buffer protection member 211 and a connection plate 212, where the buffer protection member 211 is fixed relative to the bottom protection plate 1, the connection plate 212 is connected to a side of the buffer protection member 211 facing away from the bottom protection plate 1, and the connection plate 212 is adapted to be in pressing contact with the first insulating member 22.

As shown in fig. 1, the buffer protector 211 is configured as a strip member and is disposed on the explosion-proof valve side along the extending direction of the first insulating sheet. Meanwhile, the buffer protector 211 is fixedly connected with the bottom guard plate 1 to ensure the installation stability of the buffer protector 211.

Specifically, as shown in fig. 3, the size of the buffer protector 211 may be determined according to the size of the explosion-proof valve at the time of design, and the buffer protector 211 is spaced apart from the length edge of the explosion-proof valve by about 10mm at the time of installation. Therefore, the rigidity and the buffering energy absorption characteristic of the buffering protection piece 211 can be guaranteed to meet the requirements, and the stress of the welding part of the explosion-proof valve can be protected.

And, the connection plate 212 is constructed as a rectangular plate and has the same length as the first insulating member 22 and the same width as the explosion-proof valve. The connection plate 212 is disposed right under the explosion-proof valve, and the first insulators 22 are disposed at both sides of the connection plate 212, and the connection plate 212 is disposed at a distance from the bottom protection plate 1 such that the air flow passage 6 is formed between the connection plate 212 and the bottom protection plate 1. The connecting plate 212 is further provided with a plurality of oval air holes 2121, the plurality of air holes 2121 are sequentially arranged along the extending direction of the connecting plate 212, and each air hole 2121 is guaranteed to be opposite to the explosion-proof valves of the plurality of electric cores, so that high-temperature gas generated by electric core thermal runaway is guaranteed to enter the air flow channel 6 through the air hole 2121, all high-temperature gas is finally discharged, and the situation that the high-temperature gas is accumulated and explodes is avoided.

In some embodiments, the bumper assembly 2 further includes a second insulator 23, the second insulator 23 being connected between the bumper 211 and the backplate 1.

As shown in fig. 2, the second insulating member 23 is also made of mica sheet, and the length and width of the second insulating member 23 are the same as those of the connection plate 212, so that the second insulating member 23 and the side of the bottom guard plate 1 close to the connection plate 212 are bonded and fixed. That is, the second insulating member 23 is disposed on the bottom surface of the gas flow channel 6, and when the high temperature gas passes through the gas flow channel 6, the bottom guard plate 1 structure can be protected by the heat insulation, high temperature resistance and other characteristics of the second insulating member 23, so as to improve the service life of the bottom guard plate 1.

In some embodiments, the buffer protectors 211 of the buffer protection assembly 2 are two groups, and the two groups of buffer protectors 211 are connected with the bottom guard plate 1 through the same second insulating part 23; the two groups of buffer protection pieces 211 are respectively positioned at two sides of the explosion-proof valve and respectively correspond to the first insulating pieces 22 positioned at two sides of the explosion-proof valve. It should be noted that, as shown in fig. 1, the two sets of buffer protection pieces 211 are fixedly installed above the second insulating piece 23, and the two sets of buffer protection pieces 211 are symmetrically arranged at intervals, and the interval distance is the same as the width of the connecting plate 212. Thus, the uniformity of the buffering and energy absorbing effect is ensured by the two groups of buffering and protecting pieces 211, and the stress uniformity of the battery pack 1000 is ensured.

In some embodiments, the bottom guard plate assembly 100 further comprises a buffer support 3, the buffer support 3 being connected to the side of the bottom guard plate 1 facing the battery module 300 and spaced apart from the buffer protection component 2, the buffer support 3 being adapted to press against the end of the battery cell.

As shown in fig. 1, the buffer support 3 is configured as a rectangular sheet, and the buffer support 3 is disposed on the buffer protection assembly 2 side so that both end surfaces of the buffer support 3 are respectively abutted against the battery cell and the bottom guard plate 1. In a specific arrangement, a plurality of buffer supporters 3 may be disposed at intervals along the extension direction of the buffer protector 211, thereby ensuring that the buffer supporters 3 are uniformly applied to the end surface of the battery module 300. It can be appreciated that when the battery pack 1000 is impacted by external force, the buffer supporting piece 3 is beneficial to playing a role in buffering and absorbing energy and supporting the battery cell, reducing the impact force of the battery cell, and avoiding the larger deformation of the battery cell due to the supporting effect, thereby protecting the battery module 300.

In some embodiments, the cushioning supports 3 are two sets, and the two sets of cushioning supports 3 are located on two sides of the cushioning protection assembly 2, respectively. It can be understood that, as shown in fig. 1, each group of buffer supporting members 3 includes a plurality of buffer supporting members 3 disposed at intervals along the extending direction of the buffer protecting member 211, and two groups of buffer supporting members 3 are disposed at two sides of the two groups of buffer protecting members 2, and the two groups of buffer supporting members 3 are symmetrically disposed, thereby being beneficial to improving the supporting effect and the structural strength of the battery module 300 and protecting the battery module 300.

It should be noted that, the battery module 300 includes a plurality of electric cores, so the bottom guard plate 1 is formed with a plurality of air flow channels 6, and a set of buffer supporting members 3 are disposed on two sides of each air flow channel 6, that is, a plurality of sets of buffer supporting members 3 are uniformly disposed on the entire bottom guard plate 1, so as to improve the impact resistance of the entire bottom guard plate 1, and further play a role in protecting the entire battery pack 1000.

In some embodiments, the bottom protection plate 1 is formed with a mounting boss 11 protruding toward the battery module 300, the buffer support 3 is mounted to the mounting boss 11, and the thickness of the buffer support 3 is smaller than that of the buffer protection assembly 2.

It should be noted that, as shown in fig. 2, the bottom guard plate 1 is provided with a plurality of mounting bosses 11, and the end face of each mounting boss 11 is the same as the end face of the buffer support 3, so that each mounting boss 11 can be in one-to-one correspondence with each buffer support 3. When the cushion support 3 is fixed to the end face of the mounting boss 11, the height of the cushion support 3 is the same as the height of the cushion structure 21, i.e., the thickness of the cushion structure 21 = the thickness of the cushion support 3 + the height of the mounting boss 11. Thus, when the battery pack 1000 is impacted by the outside, the buffer support 3 and the buffer protection assembly 2 can be stressed simultaneously, thereby simultaneously playing an energy absorption and buffer role to protect the battery pack 1000.

In some embodiments, the bottom protection plate 1 is provided with a protective coating 5 on a side facing away from the battery module 300. It will be appreciated that, as shown in fig. 3, the protective coating 5 is made of PVC coating, and the protective coating 5 is provided on the side of the bottom protection plate 1 facing away from the battery module 300, which is advantageous in improving the corrosion resistance of the bottom protection plate 1, the cushioning effect against external impact, the heat insulation effect, the effect of acting as a sealant to the gaps of welding and screwing, and the like.

The utility model also provides a battery pack 1000.

The battery pack 1000 according to an embodiment of the present utility model includes a liquid cooling plate 400, a case 200, a battery module 300, and the bottom plate assembly 100 of the battery pack 1000 according to any one of the above embodiments, the battery module 300 is installed in the case 200, the bottom plate assembly 100 is installed at the bottom of the case 200, the liquid cooling plate 400 is installed at the top of the case 200, and a sealing member 500 is provided between the liquid cooling plate 400 and the case 200.

As shown in fig. 4, the battery module 300 is mounted in the case 200, the liquid cooling plate 400 is provided at the top of the case 200, and the bottom protection plate assembly 100 is provided at the bottom of the case 200.

Specifically, the liquid cooling plate 400 is configured as a rectangular plate with the same size as the top surface of the case 200, the liquid cooling plate 400 and the top surface of the case 200 are adhered by the heat conducting structural adhesive 600, and the adhering area is ensured to meet 80% -100% of the area of the bottom surface of the liquid cooling plate 400, and meanwhile, the sealing member 500 is arranged between the liquid cooling plate 400 and the case 200 to ensure the tightness of the whole battery pack 1000. That is, the liquid cooling plate 400 is disposed on the upper surface of the case 200, so that the liquid cooling plate 400 can cover the entire battery module 300 at the same time, thereby providing a cooling function for all the battery modules 300, and improving the service life and the use safety of the battery cells.

As shown in fig. 4, the sealing member 500 is integrally designed in an L-shaped groove, and after the liquid cooling plate 400 is connected with the lower case 200 by a bolt, the L-shaped groove is connected and sealed by a sealing strip, so as to ensure the tightness of the whole battery pack 1000.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., 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 utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. The utility model provides a backplate assembly at bottom of battery package, its characterized in that, the battery package includes the box and is located battery module in the box, battery module includes the electric core, the bottom of electric core is equipped with explosion-proof valve, backplate assembly includes:

a bottom guard adapted to be connected to a bottom of the tank;

the buffering protection component is connected to one side, facing the battery module, of the bottom protection plate, the buffering protection component is opposite to the bottom of the battery cell and is kept away from the explosion-proof valve, and the buffering protection component is suitable for being pressed against the bottom of the battery cell when being pressed.

2. The battery pack bottom guard assembly of claim 1, wherein the buffer protection assembly comprises a buffer structure and a first insulator, the buffer structure being connected to the bottom guard, the first insulator being adapted to be connected to the bottom of the cell and to be unseated from the explosion-proof valve, the buffer structure being adapted to compress the first insulator when compressed.

3. The battery pack bottom guard assembly of claim 2, wherein the buffer structure comprises a buffer protector and a connecting plate, the buffer protector and the bottom guard are relatively fixed, the connecting plate is connected to a side of the buffer protector facing away from the bottom guard, and the connecting plate is adapted to be in pressing contact with the first insulating member.

4. The battery pack bottom guard assembly of claim 3, wherein the buffer protection component further comprises a second insulator connected between the buffer protection component and the bottom guard.

5. The bottom guard plate assembly of a battery pack according to claim 4, wherein the buffer protection members of the buffer protection assembly are in two groups, and the two groups of buffer protection members are connected with the bottom guard plate through the same second insulating member;

the two groups of buffer structures are respectively positioned at two sides of the explosion-proof valve and are respectively arranged corresponding to the first insulating pieces positioned at two sides of the explosion-proof valve.

6. The battery pack bottom guard assembly of claim 1, further comprising a buffer support connected to a side of the bottom guard facing the battery module and spaced apart from the buffer protection component, the buffer support adapted to bear against an end of the cell.

7. The battery pack bottom guard assembly of claim 6, wherein the buffer supports are in two groups, and the two groups of buffer supports are located on two sides of the buffer protection component, respectively.

8. The bottom guard plate assembly of the battery pack according to claim 6, wherein the bottom guard plate is formed with a mounting boss protruding toward the battery module, the buffer support is mounted to the mounting boss, and the thickness of the buffer support is smaller than that of the buffer protection assembly.

9. The bottom guard plate assembly of a battery pack of claim 1, wherein the bottom guard plate is provided with a protective coating on a side facing away from the battery module.

10. A battery pack, characterized by, including liquid cooling board, box, battery module and the end backplate assembly of battery pack of any one of claims 1-9, the battery module install in the box, end backplate assembly install in the bottom of box, the liquid cooling board install in the top of box, just be equipped with the sealing member between liquid cooling board and the box.