Battery pack and electric equipment

Abstract

The utility model relates to the technical field of new energy batteries, and discloses a battery pack and electric equipment, and the battery pack comprises a box body which is provided with an assembly area; the battery cell is assembled in the assembly area, the battery cell comprises a first wall and an anti-explosion valve, and the anti-explosion valve is fixedly connected with the first wall; an exhaust area is arranged between one side, deviating from the battery cell, of the separator and the box body, the separator comprises a first part and a second part connected with the first part, the first part is an insulating part and is provided with an avoiding hole opposite to the anti-explosion valve, the avoiding hole is communicated with the exhaust area, and the exhaust area is located between the first part and the box body. When the battery cell is in thermal runaway, high-temperature and high-pressure substances are discharged to the exhaust area through the avoiding holes, other normal battery cells in the assembly area cannot be affected, and the situation that other battery cells are passively triggered to be in thermal runaway is avoided; high-temperature and high-pressure substances are always located between the first part and the box body when being discharged in the exhaust area, the avoiding holes cannot generate conductive communication, and the risk of short circuit is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy battery technical field especially, and relates to a battery pack and electric equipment. BACKGROUND

[0002] Battery pack is the main application form of power battery on the market, and the battery pack includes battery cell and liquid cooling plate, the battery cell is assembled on the liquid cooling plate, the temperature of the battery cell is regulated by the liquid cooling plate, and the thermal runaway of the battery cell is avoided.

[0003] When the battery cell in the battery pack is in thermal runaway and causes the valve to spray, the high-temperature and high-pressure material sprayed by the valve enters the exhaust passage through the through hole of the partition piece, and since the high-temperature and high-pressure material sprayed by the battery cell in thermal runaway has conductivity, it will contact the conductive plate, thereby causing short circuit. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a battery pack to solve the problem of short circuit hazard when the battery cell in the battery pack is in thermal runaway and causes the valve to spray, and further provides an electric equipment using the battery pack.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a battery pack, which has a first direction, and comprises:

[0006] A box body has an assembly area accommodating cavity;

[0007] A plurality of battery cells are assembled in the assembly area, and each battery cell comprises a first wall and a pressure relief valve fixedly connected with the first wall.

[0008] A partition piece is arranged in the accommodating cavity and divides the accommodating cavity into an assembly area and an exhaust area.

[0009] A battery cell group comprises a plurality of battery cells, each battery cell is arranged in the assembly area and arranged along the first direction, the thickness direction of the battery cell is the same as the direction of the first direction, each battery cell comprises a first wall and a pressure relief valve fixedly connected with the first wall.

[0010] The assembly area is fixedly connected with the box body, and the partition supports the first wall of the battery cell. The partition includes a first part and a second part. The second part supports the first wall and has an assembly hole extending in the thickness direction of the battery cell. The first part is embedded in the assembly hole. In the first direction, the size of the first part is greater than or equal to the size of the battery cell group. The first part is an insulating part. The first part is provided with a plurality of avoidance holes arranged in the first direction. The avoidance holes are arranged in the thickness direction of the battery cell. Each avoidance hole corresponds to each explosion-proof valve and is arranged opposite to each explosion-proof valve. The avoidance hole communicates the assembly area and the exhaust area. The exhaust area is located between the first part and the box body.

[0011] Preferably, the battery pack further has a second direction perpendicular to the first direction. In the second direction, the size of the first part is smaller than the size of the battery cell group. The second direction is the same as the width direction of the battery cell.

[0012] Preferably, the avoidance hole has a first hole opening close to the first wall and a second hole opening away from the first wall. The diameter of the first hole opening is smaller than the diameter of the second hole opening.

[0013] Preferably, the first part has a flange with a guide hole communicating with the avoidance hole. The flange extends into the exhaust area.

[0014] Preferably, the hole wall of the guide hole and the hole wall of the avoidance hole are smoothly transitioned. The hole diameter of the guide hole gradually increases in the direction away from the avoidance hole.

[0015] Preferably, it further comprises a fire-retardant plate fixedly assembled in the avoidance hole.

[0016] Preferably, the first part includes a boss in the avoidance hole. The boss is an annular structure extending in the circumferential direction of the avoidance hole. The boss fixedly supports the fire-retardant plate.

[0017] Preferably, the battery pack further comprises a structural adhesive layer and a limiting adhesive strip. The limiting adhesive strip and the structural adhesive layer are arranged on the second part. The limiting adhesive strip is a closed structure arranged around the explosion-proof valve. The structural adhesive layer is arranged on the side of the limiting adhesive strip away from the explosion-proof valve. The structural adhesive layer adhesively fixes the second part and the first wall.

[0018] Preferably, the partition further has a liquid flow channel. The liquid flow channel communicates the first part and the second part with each other.

[0019] The utility model also provides a kind of electric equipment, including the battery pack described in any of the above technical solutions.

[0020] Compared with the prior art, the battery pack and the electric equipment provided by the utility model have the beneficial effects that: an exhaust area is formed between the side of the partition away from the battery cell and the box body, and the battery cell is arranged in the assembly area; when the battery cell is in thermal runaway, the high-temperature and high-pressure substances discharged through the explosion-proof valve are discharged to the exhaust area through the avoidance hole, without affecting other normal battery cells in the assembly area, so that passive triggering of thermal runaway of other battery cells is avoided; in addition, since the first part is an insulating part, the avoidance hole does not conduct electricity when subjected to high-temperature and high-pressure substances; the high-temperature and high-pressure substances are always between the first part and the box body when discharged in the exhaust area, so that the high-temperature and high-pressure conductive substances and the partition are effectively prevented from conducting electricity, and the risk of short circuit is prevented. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic view of the battery pack of the utility model;

[0022] Figure 2 is Figure 1 a front view of the battery pack of the utility model;

[0023] Figure 3 is Figure 2 an enlarged schematic view of position A of the battery pack of the utility model;

[0024] Figure 4 is Figure 3 an enlarged schematic view of position B of the battery pack of the utility model;

[0025] Figure 5 is a structural schematic view of another embodiment of the battery pack of the utility model;

[0026] Figure 6 is Figure 5 an enlarged schematic view of position C of the battery pack of the utility model;

[0027] Figure 7 is Figure 1 a sectional view of the battery pack of the utility model along the second direction;

[0028] Figure 8 is Figure 7 an enlarged schematic view of position D of the battery pack of the utility model;

[0029] Figure 9 is an assembly schematic view of the partition and the glue limiting strip of the battery pack of the utility model;

[0030] Figure 10 is Figure 9 a top view of the assembly of the partition and the glue limiting strip of the utility model.

[0031] In the figure, 1, box body, 11, cover plate, 12, bottom plate, 13, frame beam, 14, assembly area, 15, containing cavity, 2, electric core, 21, first wall, 3, explosion-proof valve, 4, partition, 41, first part, 411, flange, 412, guide hole, 413, boss, 42, second part, 421, assembly hole, 5, avoiding hole, 51, first orifice, 52, second orifice, 6, exhaust area, 7, fireproof plate, 8, structural adhesive layer, 9, adhesive limiting strip, X, first direction, Y, second direction. DETAILED DESCRIPTION

[0032] The specific embodiments of the utility model are described in further detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

[0033] A preferred embodiment of the battery pack of the utility model is shown in the figure, which comprises a box body 1, an electric core group and a partition 4, the electric core group and the partition 4 are both assembled in the box body 1, and the box body 1 forms protection for the equipment inside. Figures 1 to 10

[0034] The box body 1 is of rectangular structure and has a containing cavity 15 inside. The partition 4 is arranged in the containing cavity 15 and is fixedly connected with the box body 1. The partition 4 divides the containing cavity 15 into an assembly area 14 and an exhaust area 6.

[0035] The electric core group comprises a plurality of electric cores 2, each of which is assembled in the assembly area 14. The battery pack has a first direction X, and each electric core 2 is arranged along the first direction X. The thickness direction of the electric core 2 is the same as the direction of the first direction X. The box body 1 comprises a cover plate 11, a bottom plate 12 and a frame beam 13. The cover plate 11 and the bottom plate 12 are arranged in parallel and at intervals, and the frame beam 13 connects the cover plate 11 and the bottom plate 12.

[0036] Each electric core 2 comprises a first wall 21 and an electromagnetic valve 3. The first wall 21 is arranged towards the bottom plate 12, and the explosion-proof valve 3 is fixedly connected with the first wall 21. When the electric core 2 is out of control, the explosion-proof valve 3 is used to discharge the high-temperature and high-pressure substances in the electric core 2.

[0037] The partition 4 supports the first wall 21 of the electric core 2. The partition 4 is used to support and fix the electric core 2. The side of the partition 4 facing the electric core 2 and the box body 1 form the assembly area 14. The area between the side of the partition 4 away from the electric core 2 and the box body 1 is the exhaust area 6. The exhaust area 6 is used to release the high-temperature and high-pressure substances discharged through the explosion-proof valve 3 when the electric core 2 is out of control. When the electric core 2 is out of control, the discharged high-temperature and high-pressure substances are discharged through the exhaust area 6. The exhaust area 6 and the assembly area 14 where the electric core 2 is located are separated by the partition 4. The high-temperature and high-pressure substances will not affect other normal electric cores 2 in the assembly area 14, preventing the passive triggering of heat runaway of other electric cores 2 and causing heat spread to occur.​

[0038] The partition 4 comprises a first part 41 and a second part 42, the second part 42 supports the first wall 21 of the battery cell 2, and the second part 42 has an assembly hole 421 extending along the first direction X, and the first part 41 is embedded in the assembly hole 421. The first part 41 is an insulating part, and the first part 41 does not generate a conductive connection, which can effectively prevent the high-temperature and high-pressure substance from being in conductive communication with the partition 4. Along the first direction X, the size of the first part 41 is greater than or equal to the size of the battery cell group, and increasing the size of the first part 41 can improve the insulation effect of the first part 41. The material of the second part 42 can be a non-insulating material, such as metal, and in other embodiments, the material of the second part 42 can also be an insulating material. The first part 41 is embedded in the second part 42, and the thickness of the first part 41 and the second part 42 is consistent, and together constitutes the partition 4.

[0039] The first part 41 is provided with a plurality of avoiding holes 5 arranged at intervals along the first direction X, each avoiding hole 5 corresponds to and is arranged opposite to each explosion-proof valve 3, and the avoiding hole 5 communicates with the exhaust area 6. When the explosion-proof valve 3 discharges the high-temperature and high-pressure substance, the high-temperature and high-pressure substance directly enters the exhaust area 6 through the avoiding hole 5. Since the avoiding hole 5 is located on the first part 41 of the partition 4, the first part 41 is an insulating part, and no conductive communication occurs at the avoiding hole 5 to cause a short circuit. In this embodiment, each first wall 21 of each battery cell 2 has an explosion-proof valve 3, and the first part 41 has a plurality of avoiding holes 5, and the avoiding holes 5 are arranged one by one corresponding to the explosion-proof valves 3.

[0040] The exhaust area 6 is located between the first part 41 and the box body 1, and since the first part 41 is an insulating part, when the high-temperature and high-pressure substance is discharged in the exhaust area 6, the high-temperature and high-pressure substance is always between the first part 41 and the box body 1, and does not form a conductive communication between the second part 42 of the partition 4, thereby preventing the risk of a short circuit and causing a more serious uncontrolled reaction.

[0041] The battery pack forms an exhaust area 6 between the partition 4 away from the battery cell 2 and the box body 1, and the battery cell 2 is arranged in the assembly area 14. When the battery cell 2 is in thermal runaway, the high-temperature and high-pressure substance discharged through the explosion-proof valve 3 is discharged to the exhaust area 6 through the avoiding hole 5, and does not affect other normal battery cells 2 located in the assembly area 14, thereby avoiding passive triggering of thermal runaway of other battery cells 2. In addition, since the exhaust area 6 is located between the first part 41 of the partition 4 and the box body 1, and the first part 41 is an insulating part, the avoiding hole 5 does not generate a conductive communication when subjected to the high-temperature and high-pressure substance, and the high-temperature and high-pressure substance is always between the first part 41 and the box body 1 when discharged in the exhaust area 6. The conductive high-temperature and high-pressure substance can be effectively prevented from being in conductive communication with the partition 4, thereby preventing the risk of a short circuit.

[0042] Preferably, the battery pack also has a second direction Y, the second direction Y is perpendicular to the first direction Y, along the second direction Y, the size of the first part 41 is smaller than the size of the battery cell group, wherein the second direction Y is the same as the width direction of the battery cell 2.

[0043] The size of the first part 41 in the second direction Y is smaller than the size of the battery cell group, so that the second part 42 is in contact with part of the first wall 21 of the battery cell 2, and the second part 42 can have good support for the battery cell 2.

[0044] Preferably, the avoiding hole 5 has a first hole 51 close to the first wall 21 and a second hole 52 away from the first wall 21, and the diameter of the first hole 51 is smaller than the diameter of the second hole 52.

[0045] As shown in Figure 3 As shown in Figure 4 The diameter of the first hole 51 of the avoiding hole 5 is smaller than the diameter of the second hole 52, the hole diameter of the avoiding hole 5 gradually increases in the direction close to the exhaust area 6, and the hole wall of the avoiding hole 5 has a guiding effect, which accelerates the high-temperature and high-pressure material into the exhaust area 6 through the avoiding hole 5. In this embodiment, the avoiding hole 5 is a tapered hole. The hole wall of the tapered hole has mature processing technology and low cost. In other embodiments, the avoiding hole 5 can also have a horn structure.

[0046] Preferably, the first part 41 has a flange 411, the flange 411 has a guide hole 412 in communication with the avoiding hole 5, and the flange 411 extends into the exhaust area 6.

[0047] As shown in Figure 5 As shown in Figure 6 The flange 411 of the first part 41 extends into the exhaust area 6, and the flange 411 is located at the avoiding hole 5. When the high-temperature and high-pressure material is discharged into the exhaust area 6 through the avoiding hole 5, the high-temperature and high-pressure material passes through the flange 411, and the flange 411 has a guiding and limiting effect on the conductive high-temperature and high-pressure material.

[0048] Preferably, the hole wall of the guide hole 412 and the hole wall of the avoiding hole 5 are smoothly transitioned, and the hole diameter of the guide hole 412 gradually increases in the direction away from the avoiding hole 5.

[0049] The hole wall of the guide hole 412 and the hole wall of the avoiding hole 5 are smoothly transitioned, which facilitates the high-temperature and high-pressure material to enter the flange 411 through the avoiding hole 5, and the hole diameter of the guide hole 412 of the flange 411 gradually increases in the direction away from the avoiding hole 5. The guide hole 412 forms an open structure, and the guide hole 412 can increase the guiding effect on the high-temperature and high-pressure material.

[0050] Preferably, it also includes a fire-retardant plate 7, and the fire-retardant plate 7 is fixedly assembled in the avoiding hole 5.

[0051] A flame-retardant plate 7 is arranged inside the clearance hole 5. When high-temperature and high-pressure substances are released in the exhaust area 6, the flame-retardant plate 7 can isolate the high temperature and prevent the adjacent normal cells 2 from thermal runaway, thereby improving the safety of the battery pack.

[0052] Preferably, the first part 41 includes a boss 413 located in the clearance hole 5. The boss 413 is an annular structure extending circumferentially along the clearance hole 5, and the boss 413 fixes and supports the flame-retardant plate 7.

[0053] The first part 41 forms a boss 413 in the clearance hole 5, and uses the boss 413 to support the flame retardant plate 7, which simplifies the support assembly of the flame retardant plate 7.

[0054] Preferably, the battery pack further includes a structural adhesive layer 8 and a limiting strip 9. Both the limiting strip 9 and the structural adhesive layer 8 are located in the second part 42. The limiting strip 9 is a closed structure arranged around the explosion-proof valve 3. The structural adhesive layer 8 is located on the side of the limiting strip 9 away from the explosion-proof valve 3. The structural adhesive layer 8 is bonded and fixed to the second part 42 and the first wall 21.

[0055] like Figures 7 to 10 As shown, the structural adhesive layer 8 bonds and fixes the first wall 21 and the second part 42 of the battery cell 2. The structural adhesive layer 8 fixes the battery cell 2 and also has a thermal conductivity effect. The adhesive-limiting strip 9 is arranged around the explosion-proof valve 3 and forms a closed structure. The adhesive-limiting strip 9 has the function of blocking adhesive. When adhesive is applied between the battery cell 2 and the separator 4, the adhesive-limiting strip 9 can prevent the structural adhesive from entering the explosion-proof valve 3 and clogging it. In this embodiment, the adhesive-limiting strip 9 is a foam component.

[0056] Preferably, the separator 4 also has a liquid flow channel, which is interconnected with the first part 41 and the second part 42.

[0057] The separator 4 has a liquid flow channel that connects the first part 41 and the second part 42. Coolant can flow through the liquid flow channel, allowing the separator 4 to cool the battery cell 2. Furthermore, when the battery cell 2 experiences thermal runaway and ejects high-temperature, high-pressure substances through the explosion-proof valve 3, the separator 4 cools and lowers the temperature of the high-temperature, high-pressure substances entering the exhaust area 6, making it safer for them to be discharged through the battery pack vent valve. If the ejected substances are still above their ignition point, they may ignite upon contact with oxygen, causing secondary damage.

[0058] This utility model also provides a preferred embodiment of an electrical device, including a battery pack. The specific structure of the battery pack is the same as that of the battery pack in any of the above embodiments, and will not be described again here.

[0059] In summary, the battery pack and the electric device provided by the embodiments of the present application form an exhaust area between the side of the partition away from the battery cell and the box body, and the battery cell is arranged in the assembly area; when the battery cell is in thermal runaway, the high-temperature and high-pressure material discharged through the explosion-proof valve is discharged to the exhaust area through the avoiding hole, and does not affect other normal battery cells in the assembly area, thereby avoiding passive triggering of thermal runaway of other battery cells; in addition, the exhaust area is located between the first part of the partition and the box body, and the first part is an insulating part; when the avoiding hole bears the high-temperature and high-pressure material, the avoiding hole does not produce conductive communication; when the high-temperature and high-pressure material is discharged in the exhaust area, the high-temperature and high-pressure material is always between the first part and the box body, so that the conductive high-temperature and high-pressure material can be effectively prevented from being in conductive communication with the partition, and the risk of short circuit is prevented.

[0060] The above only describes the preferred embodiments of the present application, and it should be noted that, for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, and these improvements and substitutions should also be considered as the protection scope of the present application.

Claims

1. A battery pack, characterized by, The battery pack has a first direction, and comprises: a box body having an assembly area accommodating cavity; a plurality of battery cells, each of which is assembled in the assembly area, and comprises a first wall and an explosion-proof valve fixedly connected with the first wall; a partition arranged in the accommodating cavity and separating the accommodating cavity into an assembly area and an exhaust area; a battery cell group comprising a plurality of battery cells, each of which is assembled in the assembly area and arranged along the first direction, and the thickness direction of the battery cell is the same as the first direction, and the battery cell comprises a first wall and an explosion-proof valve fixedly connected with the first wall; the partition is fixedly connected with the box body in the assembly area and supports the first wall of the battery cell, and an exhaust area is formed between the side of the partition away from the battery cell and the box body, wherein the partition comprises a first part and a second part, the second part is supported on the first wall, the second part has an assembly hole extending along the thickness direction of the battery cell, the first part is embedded in the assembly hole, the size of the first part along the first direction is greater than or equal to the size of the battery cell group, the first part is an insulating part, the first part is provided with a plurality of avoiding holes arranged along the first direction, the avoiding holes are arranged along the thickness direction of the battery cell, each of the avoiding holes corresponds to each of the explosion-proof valves and is arranged opposite to each of the explosion-proof valves, the avoiding holes communicate the assembly area and the exhaust area, and the exhaust area is located between the first part and the box body.

2. The battery pack of claim 1, wherein, The battery pack also has a second direction perpendicular to the first direction, and the size of the first part along the second direction is less than the size of the battery cell group, wherein the second direction is the same as the width direction of the battery cell.

3. The battery pack of claim 1, wherein, The avoiding hole has a first hole opening close to the first wall and a second hole opening away from the first wall, and the diameter of the first hole opening is less than the diameter of the second hole opening.

4. The battery pack of claim 1, wherein, The first part has a flange having a guide hole communicating with the avoiding hole, and the flange extends into the exhaust area.

5. The battery pack of claim 4, wherein, The hole wall of the guide hole and the hole wall of the avoiding hole are smoothly connected, and the hole diameter of the guide hole gradually increases in the direction away from the avoiding hole.

6. The battery pack of any one of claims 1-5, wherein, The first part comprises a boss in the avoiding hole, the boss is an annular structure extending along the circumferential direction of the avoiding hole, and the boss fixedly supports the fireproof plate.

7. The battery pack of claim 6, wherein, The battery pack further comprises a structural adhesive layer and a limiting adhesive strip, the limiting adhesive strip and the structural adhesive layer are arranged on the second part, the limiting adhesive strip is a closed structure arranged around the explosion-proof valve, the structural adhesive layer is arranged on the side of the limiting adhesive strip away from the explosion-proof valve, and the structural adhesive layer adhesively fixes the second part and the first wall.

8. The battery pack of any one of claims 1-5, wherein, The partition further has a liquid flow channel, and the liquid flow channel communicates the first part and the second part.

9. The battery pack of any one of claims 1-5, wherein, The battery pack comprises any one of claims 1-9.

10. An electric device, characterized by ​

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