Battery pack lower box body, battery pack and vehicle

Abstract

The utility model discloses a battery pack lower box body, battery pack and vehicle, the battery pack lower box body comprises a bottom plate and a partition plate, the bottom plate is provided with a plurality of exhaust holes and a plurality of exhaust cavities, the exhaust holes penetrate through the upper surface of the bottom plate, and the exhaust cavities are arranged on the lower sides of the exhaust holes and are communicated with at least two exhaust holes; the partition plate is arranged on the upper side of the bottom plate, the partition plate blocks the exhaust hole, the upper surface of the partition plate is a battery cell mounting surface, the partition plate is provided with a blasting part, and the orthographic projection of the exhaust hole on the partition plate covers the blasting part. According to the embodiment of the utility model, when the battery cells are in thermal runaway, high-temperature smoke generated by the battery cells can be prevented from being conducted to the battery cells which are communicated with the same exhaust cavity and are not in thermal runaway through the exhaust cavities, so that the safety of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a battery pack lower box, a battery pack and a vehicle. Background Art

[0002] The battery pack usually includes a lower box, an upper cover and a plurality of battery cells. The lower box and the upper cover are connected to form a receiving cavity, and the battery cells are arranged in the receiving cavity. In order to avoid explosion accidents caused by thermal runaway of the battery cells, a battery cell explosion-proof valve is arranged at the bottom of the battery cell, a box explosion-proof valve and an exhaust hole corresponding to the battery cell explosion-proof valve are arranged in the lower box, and an exhaust cavity connected to both the exhaust hole and the receiving cavity is arranged at the bottom of the exhaust hole. When the battery cell has thermal runaway, the battery cell explosion-proof valve opens, and the high-temperature flue gas leaks out through the battery cell explosion-proof valve, and then is conducted to the exhaust cavity through the exhaust hole, and then diffuses into the receiving cavity, and finally is discharged out of the battery pack through the box explosion-proof valve of the battery pack. The above-mentioned exhaust cavity is connected to each exhaust hole. When one of the battery cells has thermal runaway, the high-temperature flue gas generated will be conducted to the battery cell explosion-proof valve of other battery cells through the exhaust cavity, causing heat diffusion, affecting the safety of other battery cells, and ultimately affecting the safety of the battery pack.

[0003] In order to solve the above problems, some battery packs are provided with multiple exhaust cavities on the lower box, and each exhaust cavity corresponds to a part of the exhaust holes, so that when one of the battery cells has thermal runaway, the high-temperature smoke generated will only be conducted through the exhaust cavity to the battery cell explosion-proof valve connected to the exhaust cavity, reducing the heat diffusion range, improving the thermal runaway protection capability of the battery pack, and improving the safety of the battery pack. However, when one of the battery cells has thermal runaway, the high-temperature smoke generated will at least be conducted through the exhaust cavity to the battery cell that has not experienced thermal runaway and is connected to the same exhaust cavity, affecting the safety of the battery cell that has not experienced thermal runaway. The thermal runaway protection capability of the battery pack is still relatively low, resulting in poor safety of the battery pack. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention provides a battery pack lower box to improve the safety of the battery pack.

[0006] The lower box body of the battery pack of the utility model embodiment includes a bottom plate and a partition, the bottom plate has a plurality of exhaust holes and a plurality of exhaust cavities, the exhaust holes pass through the upper surface of the bottom plate, the exhaust cavities are arranged at the lower side of the exhaust holes and are connected with at least two of the exhaust holes; the partition is arranged on the upper side of the bottom plate, the partition blocks the exhaust holes, the upper surface of the partition is the battery cell mounting surface, the partition is provided with a bursting part, and the orthographic projection of the exhaust holes on the partition covers the bursting part.

[0007] In some embodiments, the base plate includes a plurality of plate bodies arranged in sequence along a first direction, each of the plate bodies is provided with the exhaust hole and the exhaust cavity; the number of the partitions is multiple, the multiple partitions correspond one-to-one to the multiple plate bodies, and each partition is connected to the corresponding plate body; wherein the first direction is perpendicular to the up and down direction.

[0008] In some embodiments, the bottom plate is provided with a plurality of hole groups, each of the hole groups includes a plurality of exhaust holes evenly arranged along the second direction, the plurality of exhaust holes in the same hole group are connected to the same exhaust cavity, and the plurality of exhaust cavities are arranged at intervals along the first direction; the bottom plate also has a plurality of connecting holes, the connecting holes pass through the upper surface of the bottom plate, the connecting holes are arranged on at least one side of the exhaust cavity in the second direction, and the exhaust cavity is connected to at least one of the connecting holes; wherein the second direction is perpendicular to the up and down direction, and the second direction intersects with the first direction.

[0009] In some embodiments, the connecting holes are arranged on both sides of the partition in the second direction, and the orthographic projection of the partition on the bottom plate is arranged between the two connecting holes.

[0010] In some embodiments, the battery pack lower box further includes a rubber stopper, the rubber stopper is connected to the partition, and the rubber stopper and the partition form a receiving groove with an opening facing upward.

[0011] In some embodiments, the thickness of the bursting portion is less than or equal to the thickness of other portions of the partition.

[0012] An embodiment of the present invention further provides a battery pack.

[0013] The battery pack of an embodiment of the utility model includes a battery pack lower box and a plurality of battery cells, wherein the battery pack lower box is the battery pack lower box described in any of the above embodiments; the battery cells are arranged on the upper side of the partition and connected to the battery cell mounting surface, and the battery cells include battery cell explosion-proof valves, and the orthographic projection of the battery cell explosion-proof valves on the partition covers the explosion part.

[0014] An embodiment of the utility model further provides a vehicle.

[0015] The vehicle of the embodiment of the utility model includes the battery pack described in any of the above embodiments.

[0016] The lower box of the battery pack of the embodiment of the utility model installs the battery cells on the battery cell installation surface of the partition. When a part of the battery cells experience thermal runaway, the smoke generated by the thermal runaway will cause the pressure at the bursting part of the partition to increase, thereby causing the bursting part corresponding to the exhaust hole to break; thereafter, the smoke can flow along the exhaust cavity connected to the exhaust hole and finally be discharged from the battery pack through the exhaust cavity to avoid explosion accidents. For the battery cells that have not experienced thermal runaway, the pressure at the bursting part of the battery cells that have not experienced thermal runaway is relatively small and will not break, so that the battery cells will remain in a state of blocking the corresponding exhaust holes, preventing the smoke in the exhaust cavity from reaching other battery cells that have not experienced thermal runaway. In this way, the safety of the battery cells that have not experienced thermal runaway is guaranteed, the thermal runaway protection capability of the battery pack is improved, and the safety of the battery pack is thereby improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the lower box of a battery pack according to an embodiment of the utility model (the rubber stopper is not shown).

[0018] Figure 2 yes Figure 1 The schematic diagram of the structure with the partition omitted.

[0019] Figure 3 yes Figure 1 Schematic diagram of the structure of the midsole plate.

[0020] Figure 4 yes Figure 3 Schematic diagram of the structure of aluminum alloy plate.

[0021] Figure 5 It is a schematic diagram of the assembly structure of the battery pack lower box and the battery cell according to an embodiment of the utility model.

[0022] Figure 6 yes Figure 5 A partial cross-sectional view of .

[0023] Figure 7 yes Figure 5 Diagram of the smoke flow path of a battery cell with thermal runaway.

[0024] Figure 8 It is a schematic diagram of the exploded structure of a battery pack according to an embodiment of the utility model.

[0025] Fig. 9 yes Figure 8 Diagram of the smoke flow path of a battery cell with thermal runaway.

[0026] Fig.10 yes Fig. 9 A partial enlarged view of .

[0027] Fig.11 yes Figure 8 Schematic diagram of the structure of the middle upper cover.

[0028] Fig.12 yes Fig.11 Schematic diagram of the partial structure of the middle upper cover.

[0029] Reference numerals:

[0030] 100. Battery pack;

[0031] 10. Battery pack lower box;

[0032] 1. bottom plate; 11. exhaust hole; 12. exhaust cavity; 13. communication hole; 14. plate body; 141. upper surface; 142. ribs;

[0033] 2. partition; 21. battery cell mounting surface; 211. blasting part;

[0034] 3. Rubber stopper; 31. Potting glue;

[0035] 4. Side beam;

[0036] 5. End plate; 51. Box explosion-proof valve;

[0037] 20. Battery pack; 201. Battery cell; 2011. Battery cell explosion-proof valve;

[0038] 30. Upper cover; 301. Upper cover body; 302. Reinforcement plate; 303. Fixing bolts;

[0039] 40. Accommodation cavity. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0041] like Figures 1 to 7 As shown, the lower box body 10 of the battery pack of the embodiment of the utility model includes a bottom plate 1 and a partition 2. The bottom plate 1 has a plurality of exhaust holes 11 and a plurality of exhaust cavities 12. The exhaust holes 11 pass through the upper surface 141 of the bottom plate 1. The exhaust cavities 12 are arranged on the lower side of the exhaust holes 11 and are connected to at least two exhaust holes 11. The partition 2 is arranged on the upper side of the bottom plate 1, and the partition 2 blocks the exhaust holes 11. The upper surface of the partition 2 away from the bottom plate 1 is a battery cell mounting surface 21. The partition 2 is provided with a bursting portion 211, and the orthographic projection of the exhaust holes 11 on the partition 2 covers the bursting portion 211.

[0042] The bursting part 211 breaks when the pressure is greater than or equal to the preset pressure, and the maximum preset pressure that the bursting part 211 can withstand is set according to actual needs.

[0043] The lower box 10 of the battery pack of the embodiment of the utility model installs the battery cell 201 on the battery cell installation surface 21 of the partition 2. When a part of the battery cells 201 undergo thermal runaway, the smoke generated by the thermal runaway will cause the pressure at the bursting part 211 of the partition 2 to increase, thereby causing the bursting part 211 corresponding to the exhaust hole 11 to break; thereafter, the smoke can flow along the exhaust cavity 12 connected to the exhaust hole 11 and finally be discharged from the battery pack through the exhaust cavity 12 to avoid explosion accidents. For the battery cells 201 that have not experienced thermal runaway, the pressure at the bursting part 211 of the battery cells that have not experienced thermal runaway is small and will not break, so that the battery cells 201 that have not experienced thermal runaway are kept in a state of blocking the corresponding exhaust hole 11, and the smoke in the exhaust cavity 12 is prevented from reaching other battery cells 201 that have not experienced thermal runaway. In this way, the safety of the battery cells 201 that have not experienced thermal runaway is ensured, the thermal runaway protection capability of the battery pack is improved, and the safety of the battery pack is thereby improved.

[0044] In addition, in the case where the battery cell 201 is bonded to the lower case 10 of the battery pack by glue, a partition 2 is provided on the upper side of the bottom plate 1, and the battery cell 201 can be separated from the bottom plate 1 by the partition 2. Therefore, when the battery cell 201 is bonded to the lower case 10 of the battery pack by glue, the partition 2 can be used to separate the glue from the bottom plate 1 to prevent the glue from entering the vent 11 and the vent cavity 12. On the one hand, the problem of blockage of the vent 11 and the vent cavity 12 can be avoided; on the other hand, the problem of less glue between the battery cell 201 and the lower case 10 of the battery pack affecting the connection strength between the battery cell 201 and the lower case 10 of the battery pack can be avoided.

[0045] Optionally, the thickness of the bursting portion 211 is less than or equal to the thickness of other parts of the partition 2. In other words, the thickness of the bursting portion 211 is less than the thickness of other parts of the partition 2; or, the thickness of the bursting portion 211 is equal to the thickness of other parts of the partition 2.

[0046] The thickness of the bursting portion 211 is equal to the thickness of other parts of the partition 2, which can be understood as: the partition 2 is a flat plate with the same thickness everywhere.

[0047] It is understandable that in order to ensure the reliability of the partition 2 supporting the battery cell 201, the partition 2 should have sufficient strength, and the bursting part 211 needs to break when the pressure is greater than or equal to the preset pressure, and the strength of the partition 2 cannot be too high, which leads to different strength requirements for different parts of the partition 2.

[0048] By setting the thickness of the bursting part 211 to be smaller than the thickness of other parts of the partition 2, not only can the strength of the bursting part 211 of the partition 2 be ensured to be lower so that it can be broken when the pressure is greater than or equal to the preset pressure, but also the strength of the part of the partition 2 other than the bursting part 211 can be ensured to be higher so as to ensure the support reliability of the battery cell 201.

[0049] By setting the thickness of the bursting part 211 equal to the thickness of other parts of the partition 2, the thickness of the partition 2 is made equal everywhere, which facilitates the processing and manufacturing of the partition 2. It should be noted that when the thickness of the bursting part 211 is equal to the thickness of other parts of the partition 2, the thickness of the partition 2 should be determined according to the design requirements of the bursting part 211 to ensure that the bursting part 211 can be broken when the pressure is greater than or equal to the preset pressure.

[0050] Optionally, the partition plate 2 is bonded to the base plate 1 .

[0051] For example, the partition plate 2 and the bottom plate 1 are bonded together by structural adhesive or double-sided adhesive.

[0052] By bonding the partition 2 to the bottom plate, the connection and fixation between the partition 2 and the bottom plate 1 is facilitated, thereby facilitating the processing and manufacturing of the lower box body 10 of the battery pack.

[0053] Alternatively, if Figures 1 to 4 As shown, the bottom plate 1 includes a plurality of plate bodies 14 arranged in sequence along a first direction, and each plate body 14 is provided with an exhaust hole 11 and an exhaust cavity 12. There are a plurality of partitions 2, and the plurality of partitions 2 correspond to the plurality of plate bodies 14 one by one, and each partition 2 is connected to the corresponding plate body 14. The first direction is perpendicular to the up-down direction.

[0054] In order to make the technical solution of the present application easier to understand, the technical solution of the present application is further described below by taking the first direction being consistent with the left-right direction as an example. Figures 1 to 5 shown.

[0055] For example, Figure 2 As shown, the bottom plate 1 includes three plate bodies 14 connected in sequence along the left-right direction, and each plate body 14 is provided with an exhaust hole 11 and an exhaust cavity 12. There are three partitions 2 and three plate bodies 14, and the three partitions 2 correspond to the three plate bodies 14 one by one, and each partition 2 is connected to the corresponding plate body 14.

[0056] By providing the bottom plate 1 with a plurality of plate bodies 14, the size of each plate body 14 is small, which not only facilitates the processing and manufacturing of a single plate body 14, but also facilitates the transportation of a single plate body 14, which helps to reduce the difficulty of manufacturing and transporting the bottom plate 1. By providing a plurality of partitions 2, the size of each partition 2 is small, which not only facilitates the processing and manufacturing of a single partition 2, but also facilitates the transportation of a single partition 2, which helps to reduce the difficulty of manufacturing and transporting the partition 2.

[0057] Optionally, adjacent plates 14 are welded.

[0058] Optionally, the plate body 14 is made of aluminum alloy and is manufactured by extrusion molding.

[0059] For example, Figure 4As shown, the plate body 14 is formed into a plurality of exhaust cavities 12 by extrusion, and adjacent exhaust cavities 12 are separated by ribs 142 .

[0060] In some embodiments, Figures 2 to 4 As shown, the bottom plate 1 is provided with a plurality of hole groups, each hole group includes a plurality of exhaust holes 11 evenly arranged along the second direction, the plurality of exhaust holes 11 in the same hole group are all connected to the same exhaust cavity 12, and the plurality of exhaust cavities 12 are arranged at intervals along the first direction. The bottom plate 1 also has a plurality of connecting holes 13, the connecting holes 13 pass through the upper surface 141 of the bottom plate 1, the connecting holes 13 are arranged on at least one side of the exhaust cavity 12 in the second direction, and the exhaust cavity 12 is connected to at least one connecting hole 13. The second direction is perpendicular to the up-down direction, and the second direction intersects with the first direction.

[0061] In order to make the technical solution of the present application easier to understand, the technical solution of the present application is further described below by taking the second direction being consistent with the front-back direction as an example. Figures 1 to 5 shown.

[0062] For example, Figures 2 to 4 As shown, multiple exhaust holes 11 in the same hole group are evenly arranged in the front-to-back direction. Each exhaust cavity 12 extends in the front-to-back direction, and multiple exhaust cavities 12 are arranged at intervals in the left-to-right direction. The connecting hole 13 passes through the upper surface 141 of the bottom plate 1, and the connecting hole 13 is arranged on both sides of the exhaust cavity 12 in the front-to-back direction, and the exhaust cavity 12 is connected to the front and rear two connecting holes 13.

[0063] By penetrating the connecting hole 13 through the upper surface 141 of the bottom plate 1, the exhaust cavity 12 is connected to at least one connecting hole 13, so that the smoke in the exhaust cavity 12 can be conducted to the inside of the battery pack through the connecting hole 13, and finally discharged to the outside of the battery pack through the explosion-proof valve on the battery pack. By arranging the connecting hole 13 on at least one side of the hole group in the second direction, the smoke in any exhaust hole 11 in the hole group can flow to at least one side of the exhaust cavity 12 along the second direction, and finally be discharged to the outside of the battery pack through the connecting hole 13 arranged on at least one side of the exhaust cavity 12. Thereby, it is possible to further prevent the smoke from flowing through the battery cell 201 that has not experienced thermal runaway, and further improve the safety of the battery pack.

[0064] Optionally, the communication holes 13 are arranged on both sides of the partition plate 2 in the second direction, and the orthographic projection of the partition plate 2 on the bottom plate 1 is arranged between the two communication holes 13 to avoid the communication holes 13 .

[0065] For example, Figures 2 to 4 As shown, in the front-to-back direction, the partition plate 2 is disposed between two adjacent communication holes 13 , thereby preventing the partition plate 2 from blocking the communication holes 13 .

[0066] It is understandable that the smoke in the exhaust chamber 12 should be discharged as quickly as possible to avoid affecting the safety of the battery cell 201 that is arranged corresponding to the exhaust chamber 12 and has not experienced thermal runaway. Therefore, the connecting hole 13 is preferably kept in a normally open state so that the smoke in the exhaust chamber 12 can be discharged as quickly as possible.

[0067] By arranging the connecting hole 13 on both sides of the partition 2 in the second direction, and staggering the projection of the partition 2 on the bottom plate 1 and the connecting hole 13, it is possible to avoid the partition 2 blocking the connecting hole 13, so that the smoke in the exhaust chamber 12 can be discharged as quickly as possible, further improving the safety of the battery pack.

[0068] In some embodiments, Figure 3 and Figure 8 As shown, the battery pack lower box 10 further includes a rubber stopper 3, which is connected to the partition 2. The rubber stopper 3 and the partition 2 form a receiving groove with an opening facing upward, and the receiving groove is used to receive the battery cell 201.

[0069] For example, Figure 8 As shown, there are four rubber stoppers 3, which are respectively arranged around the partition 2. The four rubber stoppers 3 and the partition 2 together form a receiving groove with an opening facing upward, and the battery cell 201 is located in the receiving cavity.

[0070] When the battery cell 201 and the partition 2 need to be bonded with glue, the glue blocking member 3 is provided to block the glue, thereby preventing excessive glue from flowing to areas other than the connection between the battery cell 201 and the partition 2. This is beneficial for improving the connection reliability between the battery cell 201 and the partition 2 while saving the amount of glue.

[0071] Optionally, the rubber blocking member 3 is a rubber blocking plate.

[0072] Optionally, the rubber stopper 3 is bonded to the partition 2 .

[0073] When connecting the battery cells 201 to the partition 2, the multiple battery cells 201 can be placed at the preset positions of the partition 2, that is, the multiple battery cells 201 can be placed on the corresponding battery cell installation surfaces 21; then, the glue is poured into the receiving groove through the opening of the receiving groove, and the connection between the multiple battery cells 201 and the partition 2 and the connection between adjacent battery cells 201 are achieved at the same time. This is conducive to improving the assembly efficiency between the battery cells 201 and the lower box 10 of the battery pack, that is, improving the assembly efficiency of the battery pack.

[0074] Optionally, the partition 2 is a mica board.

[0075] like Figure 8 and Fig. 9As shown, the battery pack 100 includes a battery pack lower box 10 and a plurality of battery cells 201. The battery pack lower box 10 is the battery pack lower box 10 described in any of the above embodiments. The battery cells 201 are arranged on the upper side of the partition 2 and connected to the battery cell mounting surface 21. The battery cells 201 include battery cell explosion-proof valves 2011. The orthographic projection of the battery cell explosion-proof valves 2011 on the partition 2 covers the explosion portion 211.

[0076] For example, Figure 7 and Fig.10 As shown, when thermal runaway occurs in the battery cell 201, the battery cell explosion-proof valve 2011 is first opened, so that the smoke generated by the battery cell 201 can reach the bursting part 211; then, the pressure at the bursting part 211 increases and breaks, so that the smoke can enter the exhaust hole 11 corresponding to the battery cell 201 that has thermal runaway; thereafter, the smoke enters the exhaust cavity 12, flows along the extension direction of the exhaust cavity 12, and is finally discharged to the outside of the battery pack 100 through the exhaust cavity 12.

[0077] Therefore, the battery pack 100 of the embodiment of the present invention has the advantages of good safety and the like.

[0078] Optionally, multiple battery cells 201 form multiple battery packs 20, and the multiple battery packs 20 correspond to the multiple plates 14 one by one, and each battery pack 20 is arranged on the upper side of the corresponding plate 14. Among them, the battery cell 201 can be a cylindrical battery cell, and the center line of the cylindrical battery cell coincides with the center line of the corresponding exhaust hole 11.

[0079] Optionally, the battery pack 20 includes a plurality of cylindrical battery cells and a liquid cooling plate.

[0080] When the battery pack 20 is assembled with the lower box 10 of the battery pack, the battery pack 20 can be placed on the bottom plate 1 with the partition 2 attached thereto to ensure that the cylindrical battery cell is concentric with the exhaust hole 11 .

[0081] like Figure 8 and Fig. 9 As shown, the battery pack 100 further includes an upper cover 30 , which is connected to the lower box body 10 of the battery pack, and the upper cover 30 and the lower box body 10 of the battery pack form a receiving cavity, and the battery cell 201 is disposed in the receiving cavity 40 .

[0082] For example, Figure 1 , Figure 2 , Figure 4 , Figure 8 and Fig. 9 As shown, the battery pack lower box 10 also includes two side beams 4, two end plates 5 and a box explosion-proof valve 51. The two side beams 4 are respectively arranged on the left and right sides of the bottom plate 1, and the two end plates 5 are respectively arranged on the front and rear sides of the bottom plate 1. The two end plates 5 are provided with a box explosion-proof valve 51. The two side beams 4, the two end plates 5, the bottom plate 1 and the upper cover 30 form a receiving cavity 40. Fig. 9 and Fig.10 As shown, when the battery cell 201 has thermal runaway, the battery cell explosion-proof valve 2011 is first opened, so that the smoke generated by the battery cell 201 can reach the bursting part 211; then, the pressure at the bursting part 211 increases, so that the bursting part 211 breaks when the pressure is greater than or equal to the preset pressure, so that the smoke can enter the exhaust hole 11 corresponding to the battery cell 201 that has thermal runaway; thereafter, the smoke enters the exhaust cavity 12, and flows to the two ends of the exhaust cavity 12 along the extension direction of the exhaust cavity 12, so that the smoke can enter the accommodating cavity 40 through the connecting hole 13; then, the box explosion-proof valve 51 is opened at a certain pressure, so that the smoke is discharged to the outside of the battery pack 100 through the box explosion-proof valve 51.

[0083] Optionally, a sealing ring is provided between the upper cover 30 and the lower box body 10 of the battery pack.

[0084] For example, the sealing ring is a rubber ring.

[0085] Optionally, the upper cover 30 is detachably connected to the lower box body 10 of the battery pack.

[0086] For example, the upper cover 30 is connected to the lower box body 10 of the battery pack by connecting bolts.

[0087] Alternatively, if Fig.11 and Fig.12 As shown, the upper cover 30 includes an upper cover body 301, a reinforcing plate 302 and fixing bolts 303, wherein the reinforcing plate 302 is connected to the upper cover body 301, and the fixing bolts 303 are connected to the reinforcing plate 302. The fixing bolts 303 are used to install the battery pack 100.

[0088] For example, the reinforcing plate 302 is welded to the upper cover body 301 , the fixing bolts 303 are welded to the reinforcing plate 302 , and the fixing bolts 303 are used to connect to the vehicle so as to install the battery pack 100 on the vehicle.

[0089] Optionally, two adjacent battery cells 201 are bonded together by glue.

[0090] For example, Fig.10 As shown, two adjacent battery cells 201 are bonded together by a potting adhesive 31 .

[0091] The battery pack 100 of the embodiment of the utility model has the following advantages:

[0092] (1) By providing the exhaust hole 11 and the exhaust cavity 12 on the bottom plate 1 as an exhaust channel for the high-temperature gas in thermal runaway, the Z-direction space of the battery pack 100 can be reduced and the volume grouping efficiency can be improved;

[0093] (2) The arrangement of the exhaust holes 11 and the exhaust chambers 12 can achieve the independence of each column of battery cells 201. When a battery cell 201 has thermal runaway, it has no impact on the battery cells 201 in other columns, thereby improving the safety and reliability of the battery pack 100.

[0094] (3) The partition 2 is provided at the bottom of the battery cell 201 to prevent the high-temperature thermal runaway or life degradation of the adjacent battery cells 201 in the same column caused by the thermal runaway of a single battery cell 201 .

[0095] The vehicle of the embodiment of the utility model comprises the battery pack 100 described in any of the above embodiments, wherein the vehicle may be a hybrid vehicle or a pure electric vehicle.

[0096] Since the battery pack 100 according to the embodiment of the present invention has advantages such as good safety, the vehicle according to the embodiment of the present invention has advantages such as good safety.

[0097] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A battery pack lower box, characterized in that: include: A bottom plate, the bottom plate having a plurality of exhaust holes and a plurality of exhaust cavities, the exhaust holes passing through the upper surface of the bottom plate, the exhaust cavities being arranged at the lower side of the exhaust holes and communicating with at least two of the exhaust holes; A partition is arranged on the upper side of the bottom plate, the partition blocks the exhaust hole, the upper surface of the partition is the battery cell installation surface, the partition is provided with a bursting part, and the orthographic projection of the exhaust hole on the partition covers the bursting part.

2. The battery pack lower box according to claim 1, characterized in that: The bottom plate comprises a plurality of plate bodies arranged in sequence along a first direction, and each of the plate bodies is provided with the exhaust hole and the exhaust cavity; There are multiple partitions, each of which corresponds to the multiple plate bodies, and each of the partitions is connected to the corresponding plate body; Wherein, the first direction is perpendicular to the up-down direction.

3. The battery pack lower box according to claim 2, characterized in that: The bottom plate is provided with a plurality of hole groups, each of the hole groups includes a plurality of exhaust holes evenly arranged along the second direction, the plurality of exhaust holes in the same hole group are connected to the same exhaust cavity, and the plurality of exhaust cavities are arranged at intervals along the first direction; The bottom plate further has a plurality of communication holes, the communication holes passing through the upper surface of the bottom plate, the communication holes being arranged on at least one side of the exhaust cavity in the second direction, and the exhaust cavity being connected to at least one of the communication holes; The second direction is perpendicular to the up-down direction, and the second direction intersects with the first direction.

4. The battery pack lower box according to claim 3, characterized in that: The communicating holes are arranged at both sides of the partition plate in the second direction, and the orthographic projection of the partition plate on the bottom plate is arranged between the two communicating holes.

5. The battery pack lower box according to claim 1, characterized in that: The battery pack lower box also includes a rubber stopper, which is connected to the partition, and the rubber stopper and the partition form a receiving groove with an opening facing upward.

6. The battery pack lower box according to any one of claims 1 to 5, characterized in that: The thickness of the bursting portion is less than or equal to the thickness of other portions of the partition.

7. A battery pack, characterized in that: include: A battery pack lower box, wherein the battery pack lower box is the battery pack lower box according to any one of claims 1 to 6; A plurality of battery cells are provided on the upper side of the partition and connected to the battery cell mounting surface, the battery cells include battery cell explosion-proof valves, and the orthographic projection of the battery cell explosion-proof valves on the partition covers the bursting part.

8. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 7.

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