Battery pack assembly and electric equipment

Abstract

The utility model provides a battery pack assembly and electric equipment. The battery pack assembly comprises a first cold plate, a first frame and a first battery cell module, and the first battery cell module is arranged in a first accommodating chamber. The battery pack further comprises a partition plate, the partition plate is arranged in the first containing cavity, the partition plate and the first cold plate are arranged in a spaced mode to form a first pressure relief channel, the partition plate is arranged between the first cold plate and the first battery cell module, and the first battery cell module can relieve pressure through the first pressure relief channel. And when the first battery cell module is subjected to thermal runaway, the first pressure relief channel can exchange heat with the upper surface of the first cold plate, so that heat generated during pressure relief is effectively guided out, the harm generated by heat accumulation is reduced, and the safety of the battery pack assembly is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery pack assembly and an electrical device. Background Technology

[0002] When a large cylindrical battery cell is charging and discharging, the decomposition reaction of the internal electrolyte releases heat. At the same time, the internal electrolyte evaporates due to the increased temperature, producing reactive gases. This causes the internal pressure of the battery to increase rapidly, eventually leading to the rupture or explosion of the battery casing.

[0003] In related technologies, multi-layer battery modules are often equipped with pressure relief devices to release internal gas when the pressure is too high in order to prevent serious consequences. However, due to the large amount of heat carried by the pressure relief gas, the heat accumulation during the pressure relief process may damage the battery pack. Utility Model Content

[0004] Embodiments of this application provide a battery pack assembly and an electrical device that can improve the technical problem of heat accumulation during the battery pack depressurization process.

[0005] In a first aspect, embodiments of this application provide a battery pack assembly, the battery pack assembly comprising:

[0006] First cold plate;

[0007] A first frame surrounds the first cold plate, and the first frame and the first cold plate form a first receiving chamber;

[0008] The first battery cell module is disposed in the first receiving cavity;

[0009] A partition is disposed within the first receiving cavity and between the first cold plate and the first battery cell module to support the first battery cell module. The side of the partition away from the first battery cell module is spaced apart from the first cold plate to form a first pressure relief channel, through which the first battery cell module can release pressure.

[0010] In some embodiments, the first frame includes a first end plate and two first side plates disposed opposite to each other, the first end plate being connected between the two first side plates, the battery pack assembly further including a first baffle, the first baffle being disposed in a first receiving cavity and spaced apart from the first end plate to form a first pressure relief space, the baffle having a first pressure relief port, the first pressure relief port communicating with the first pressure relief channel and the first pressure relief space, the first end plate or any of the first side plates having a first pressure relief outlet, the first pressure relief outlet communicating with the first pressure relief space and the outside of the battery pack assembly.

[0011] In some embodiments, the first cell module includes a plurality of first cells, each first cell including a first pressure relief portion, and the partition is provided with a plurality of first pressure relief holes. The first pressure relief portion of each first cell is disposed toward the first pressure relief hole so that the first cell releases pressure to the first pressure relief space through the first pressure relief hole.

[0012] In some embodiments, the first pressure relief outlet is located on the first end plate, and the battery pack assembly further includes a first explosion-proof valve, which is installed at the first pressure relief outlet.

[0013] In some embodiments, the battery pack assembly includes a plurality of support ribs disposed within the first pressure relief channel, one end of the support rib being connected to the first cold plate and the other end being connected to the partition plate.

[0014] In some embodiments, the battery pack assembly includes:

[0015] Base plate;

[0016] A second frame is disposed between the base plate and the first cold plate to form a second receiving chamber;

[0017] The second battery cell module is disposed in the second receiving cavity. The base plate is used to support the second battery cell module, and the first cold plate is used to dissipate heat from the second battery cell module.

[0018] In some embodiments, the first cold plate, the first frame, and the partition form a first housing, the bottom plate and the second frame form a second housing, the battery pack assembly includes a plurality of first housings, the plurality of first housings are stacked to form a first housing group, and the first housing group is stacked on the second housing.

[0019] In some embodiments, the battery pack assembly further includes a second cold plate covering the first housing located at the top of the first housing assembly to seal the first receiving chamber.

[0020] In some embodiments, the battery pack assembly includes a first CCS module and a first thermally conductive adhesive layer, wherein the first CCS module is connected to the side of the first cell module facing away from the first cold plate, and the first thermally conductive adhesive layer is bonded between the first CCS module and the second cold plate;

[0021] The battery pack assembly includes a second CCS module and a second thermally conductive adhesive layer. The second CCS module is connected to the side of the second cell module away from the base plate, and the second thermally conductive adhesive layer is bonded between the second CCS module and the first cold plate.

[0022] In some embodiments, the second cell module includes a plurality of cylindrical cells arranged sequentially, each of the cylindrical cells being thermally connected to the first cold plate along an axial direction. In a second aspect, this application also provides an electrical device comprising a battery pack assembly as described above.

[0023] The beneficial effects of the embodiments of this application are as follows:

[0024] In embodiments of this application, the battery pack assembly includes a first cold plate, a first frame, and a first cell module. The first frame surrounds the first cold plate to form a first receiving chamber, and the first cell module is disposed within the first receiving chamber. The battery pack also includes a separator, which is disposed within the first receiving chamber and spaced apart from the first cold plate to form a first pressure relief channel. The separator is positioned between the first cold plate and the first cell module, allowing the first cell module to release pressure through the first pressure relief channel. When the first cell module experiences thermal runaway, the first pressure relief channel can exchange heat with the upper surface of the first cold plate to effectively dissipate the heat generated during pressure relief, reducing the hazards caused by heat accumulation and improving the safety of the battery pack assembly. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a portion of the battery pack assembly structure provided in an embodiment of this application;

[0027] Figure 2 yes Figure 1 An enlarged schematic diagram of part A shown;

[0028] Figure 3 This is a cross-sectional view of a portion of the battery pack assembly structure provided in an embodiment of this application;

[0029] Figure 4 yes Figure 3 An enlarged schematic diagram of part B shown;

[0030] Figure 5 yes Figure 3 An enlarged schematic diagram of part C shown;

[0031] Figure 6 This is a schematic diagram of the structure of the battery pack assembly provided in an embodiment of this application;

[0032] Figure 7 yes Figure 6 An exploded view of the battery pack assembly shown.

[0033] Figure 8 yes Figure 6 A cross-sectional view of the battery pack assembly shown;

[0034] Figure 9 yes Figure 8 An enlarged schematic diagram of part D is shown;

[0035] Figure 10 yes Figure 7 The exploded view of the first box shown;

[0036] Figure 11 yes Figure 7 The diagram shows the structure of the second box.

[0037] Figure 12 yes Figure 11 The cross-sectional view of the second box shown;

[0038] Figure 13 yes Figure 12 The enlarged schematic diagram of part E shown.

[0039] Figure label:

[0040] 1000, Battery pack assembly;

[0041] 100. First housing; 1001. First battery cell module; 110. First cold plate; 120. First frame; 121. First end plate; 122. First side plate; 123. First connecting edge; 124. Second connecting edge; 130. Partition; 1301. First pressure relief channel; 1302. First pressure relief hole; 140. First baffle; 1400. First pressure relief space; 1401. First pressure relief port; 1402. First pressure relief outlet; 150. First CCS module; 160. First thermally conductive adhesive layer; 170. First explosion-proof valve; 180. Support rib;

[0042] 200. Second housing; 2001. Second battery cell module; 201. Base plate; 2010. Second pressure relief channel; 220. Second frame; 221. Second end plate; 222. Second side plate; 223. Third connecting edge; 224. Fourth connecting edge; 230. Second baffle; 2300. Second pressure relief space; 2301. Second pressure relief port; 2302. Second pressure relief outlet;

[0043] 300. Second cold plate. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0045] During charging and discharging, the decomposition reaction of the internal electrolyte in a large cylindrical battery cell releases heat. Simultaneously, the electrolyte evaporates due to the increased temperature, producing reactive gases. This causes a rapid increase in internal pressure, potentially leading to the rupture or explosion of the battery casing. Multilayer battery modules in related technologies often incorporate pressure relief devices to release internal gases when pressure becomes too high, preventing serious consequences. However, the large amount of heat carried by these relief gases can accumulate during the pressure relief process and potentially damage the battery pack.

[0046] Please refer to Figures 1-2 , Figure 1 This is a schematic diagram of a portion of the battery pack assembly structure provided in an embodiment of this application. Figure 2 yes Figure 1 The diagram shows an enlarged view of part A. This application provides a battery pack assembly 1000, which includes a first cold plate 110, a first frame 120, and a first cell module 1001. The first frame 120 surrounds the first cold plate 110 to form a first receiving chamber, and the first cell module 1001 is disposed within the first receiving chamber. The receiving chamber ensures the stability of the battery during use and prevents the battery from shifting, being damaged, or short-circuited due to vibration, impact, or external forces. The first frame 120 includes two opposing first side plates 122 and two opposing first end plates 121. Each end plate 121 is connected to a first side plate 122 at both ends, and the two end plates 121 and the two first side plates 122 surround the first receiving chamber. For easier observation, Figure 1 The structure of the first end plate is not shown.

[0047] The battery pack assembly 1000 also includes a separator 130 disposed in the first receiving cavity. The separator 130 and the first cold plate 110 are spaced apart to form a first pressure relief channel 1301. The first pressure relief channel 1301 is located on the side of the separator 130 away from the first cell module 1001. The separator 130 is disposed between the first cold plate 110 and the first cell module 1001 and is used to support the first cell module 1001. The first cell module 1001 can release pressure through the first pressure relief channel 1301.

[0048] Understandably, the first cold plate 110 stores coolant, which has thermal conductivity and can act as a heat transfer medium to remove heat. When the first cell module 1001 experiences thermal runaway, the first pressure relief channel 1301 can exchange heat with the upper surface of the first cold plate 110 to effectively dissipate the heat generated during pressure relief, reduce the hazards caused by heat accumulation, avoid fires and explosions caused by thermal runaway, and improve the safety of the battery pack assembly 1000.

[0049] In some examples, the cells of the first cell module 1001 are all cylindrical cells, and this application will use this as an example for illustration. In some examples, the cells can also be square cells.

[0050] In some examples, the material of the first cell module 1001 can be a lithium-ion battery module, a sodium-ion battery module, a nickel-metal hydride battery module, a lead-acid battery module, a polymer battery module, etc.

[0051] Please refer to Figures 3-5 , Figure 3 This is a cross-sectional view of a portion of the structure of the battery pack assembly 1000 provided in an embodiment of this application. Figure 4 yes Figure 3 The enlarged schematic diagram of part B shown is shown below. Figure 5 yes Figure 3 The diagram shows an enlarged view of part C. In some embodiments, the battery pack assembly 1000 further includes a first baffle 140, which is disposed in a first receiving cavity and spaced apart by one of the first end plates 121. Each end of the first baffle 140 is connected to a first side plate 122. The first baffle 140, the first end plate 121, and a portion of the two first side plates 122 form a first pressure relief space 1400. A partition 130 has a first pressure relief port 1401, which connects to a first pressure relief channel 1301 and the first pressure relief space 1400. The first end plate 121 or either of the first side plates 122 has a first pressure relief outlet 1402, which connects to the first pressure relief space 1400 and the outside of the battery pack assembly 1000.

[0052] Specifically, the first pressure relief space 1400 can collect the gas in the first pressure relief channel 1301, allowing the gas in the first pressure relief channel 1301 to be discharged to the outside through a single pressure relief outlet, eliminating the need for multiple outlets. Furthermore, when the partition 130 and the first cold plate 110 are close together, a large amount of pressure relief gas will accumulate in the first pressure relief channel 1301. Connecting the first pressure relief channel 1301 and the first pressure relief space 1400 through the first pressure relief port 1401 expands the flow space for the first pressure relief gas, preventing excessive pressure caused by gas accumulation and impacting the partition 130 structure.

[0053] In some embodiments, the first battery cell module 1001 includes a plurality of first battery cells, each of which includes a pressure relief portion. The partition 130 is provided with a plurality of first pressure relief holes 1302, and at least some of the first pressure relief portions of the first battery cells are disposed toward the first pressure relief holes 1302, so that the first battery cells can release pressure to the first pressure relief space 1400 through the first pressure relief holes 1302.

[0054] Understandably, by setting up the partition 130 and sealing the first pressure relief hole 1302 of the first battery cell, the first pressure relief channel 1301 is not connected to the first receiving chamber. When the internal temperature of the first battery cell rises and causes the first battery cell to explode at the pressure relief part, the high temperature and high pressure gas inside the first battery cell can enter the first pressure relief channel 1301. This can prevent the electrolyte inside the exploding first battery cell from directly splashing onto the surrounding first battery cells, and prevent the sprayed material from arcing and conducting with the surrounding first battery cells, thus preventing heat spread.

[0055] In some examples, the first battery cell can be located on the side of the partition 130 away from the first cold plate 110, corresponding to the first pressure relief hole 1302. Mica sheets are provided between the multiple first battery cells and the corresponding first pressure relief hole 1302. The mica sheets can be bonded to the partition 130. When the first battery cell needs to be depressurized, the depressurized gas breaks through the mica sheets and enters the first pressure relief channel 1301.

[0056] In some embodiments, the first pressure relief outlet 1402 is located on the first end plate 121, and the battery pack assembly 1000 further includes a first explosion-proof valve 170, which is installed on the first pressure relief outlet 1402.

[0057] Understandably, when gas accumulates inside the battery due to overcharging, short circuit, excessive temperature, or internal chemical reactions, causing the internal pressure of the battery to rise, the first explosion-proof valve 170 can automatically open to release excess gas and prevent the battery casing from rupturing or exploding due to excessive pressure.

[0058] In some examples, the first explosion-proof valve 170 includes a first sealing plate and a first valve core, the first sealing plate being mounted on the first pressure relief outlet 1402, and the first valve core being connected to the first sealing plate and protruding toward the first baffle 140.

[0059] In some embodiments, the battery pack assembly 1000 further includes two first liquid cooling connectors connected to the other end of the first cold plate 110 away from the first explosion-proof valve 170, and the two first liquid cooling connectors are used to communicate with the first cold plate 110 to circulate coolant.

[0060] In some embodiments, the first cold plate 110 is provided with a plurality of first flow channels. Because metal has high thermal conductivity, the first cold plate 110 can be made of metals such as aluminum or copper. The plurality of first flow channels inside the first cold plate 110 are used for the flow of coolant. These first flow channels help increase the contact area between the coolant and the first pressure relief channel 1301, thereby improving the heat exchange efficiency with the pressure relief gas.

[0061] In some embodiments, the battery pack assembly 1000 further includes two first sealing members, which are disposed at both ends of the first cold plate 110 to block the flow channels, thereby preventing coolant overflow and ensuring smooth flow of coolant inside the first cold plate 110. The first sealing members can be connected to the first cold plate 110 by means of screws, snap-fits, welding, etc.

[0062] In some embodiments, the battery pack assembly 1000 includes a plurality of support ribs 180, which are spaced apart within the first pressure relief channel 1301. The support ribs 180 are straight structures, with one end connected to the first cold plate 110 and the other end connected to the partition plate 130.

[0063] Understandably, battery packs are susceptible to external impacts during collisions, drops, or transportation. The support rib 180 helps to disperse the externally applied force, preventing the separator 130 from deforming or breaking. In addition, the support rib 180 can increase airflow within the first pressure relief channel 1301, which helps to improve heat dissipation efficiency and reduce local heat accumulation.

[0064] Please refer to Figures 6-7 , Figure 6 This is a schematic diagram of the structure of the battery pack assembly provided in an embodiment of this application. Figure 7 yes Figure 6The diagram shows an exploded view of the battery pack assembly. In some embodiments, the battery pack assembly further includes a base plate 201, a second frame 220, and a second cell module 2001. The second frame 220 is disposed between the base plate 201 and the first cold plate 110 to form a second receiving chamber. The second cell module 2001 is disposed in the second receiving chamber. The base plate 201 is used to support the second cell module 2001. The first cold plate 110 is used to dissipate heat from the second cell module 2001 to reduce its temperature.

[0065] In some examples, the material of the second cell module 2001 can be a lithium-ion battery module, a sodium-ion battery module, a nickel-metal hydride battery module, a lead-acid battery module, a polymer battery module, etc.

[0066] In some embodiments, a first cold plate 110, a first frame 120 and a partition 130 form a first housing 100, a bottom plate 201 and a second frame 220 form a second housing 200, and a battery pack assembly 1000 includes a plurality of first housings 100, the plurality of first housings 100 are stacked to form a first housing group, and the first housing group is stacked on the second housing 200.

[0067] In some embodiments, the battery pack assembly 1000 further includes a second cold plate 300, which covers the first housing 100 located at the top of the first housing 100 assembly to close the first receiving chamber.

[0068] For details, please refer to Figures 8-9 , Figure 8 yes Figure 6 The cross-sectional view of the battery pack assembly shown is shown. Figure 9 yes Figure 8 The diagram shows a magnified view of part D, where solid lines represent heat conduction paths and dashed lines represent pressure relief paths. This application uses a battery pack assembly 1000 comprising two first housings 100 and one second housing 200 as an example: The second cell module 2001 in the bottom second housing 200 generates heat through pressure relief; the pressure is released downwards through the second pressure relief channel 2010, while the heat from the second cell module 2001 is conducted upwards into the first cold plate 110; the first cell module 1001 in the middle first housing 100 generates heat; the pressure is released downwards through the first pressure relief channel 1301, while the heat from the first cell module 1001 is conducted upwards into the first cold plate 110 in the upper first housing 100; the first cell module 1001 in the top first housing 100 generates heat; the pressure is released downwards through the first pressure relief channel 1301, while the heat from the first cell module 1001 is conducted upwards into the top second cold plate 300.

[0069] Therefore, the difference between the first housing 100 located at the top layer and the first housing 100 located in the middle layer is that the first housing 100 located at the top layer conducts heat through the second cold plate 300, while the first housing 100 located in the middle layer conducts heat through another first cold plate 110. The number of first housings 100 located in the middle layer can be 2, 3, 4, etc. When the number of first housings 100 increases, the first cell module 1001 in each first housing 100 located in the middle layer generates heat, and its pressure can be released downward through the first pressure relief channel 1301, and its heat can be conducted upward into the first cold plate 110 of another first housing 100, and so on. This application will not repeat the details.

[0070] It is understandable that batteries generate a lot of heat during charging and discharging, especially under high power loads. Experiments have shown that the radial thermal conductivity of a large cylindrical battery cell is 15W / mk, while its axial thermal conductivity is over 20W / mk. Therefore, the axial thermal conductivity of a large cylindrical battery cell is better than its radial thermal conductivity.

[0071] In this application, the first cold plate 110 located at the top of the middle layer first housing 100 and the second cold plate 300 located at the top of the top layer first housing 100 can use a cooling medium to quickly remove the heat generated by the battery, preventing the battery temperature from becoming too high and avoiding the risk of overheating or thermal runaway. Because the structures of the first housing 100 and the second housing 200 are different, the structure of multiple first housings 100 grouped together and assembled with the second housing 200 in this application allows each housing to have an independent pressure relief channel and heat dissipation channel. Heat can be dissipated axially through the cold plate, while pressure can be relieved along the pressure relief channel. This means heat and pressure are conducted through different paths, achieving thermoelectric separation and improving the heat conduction and pressure relief effect of the battery pack assembly 1000.

[0072] Furthermore, the first housing 100 and the second housing 200 of this application integrate the liquid cooling channel and the pressure relief channel. Compared with the structure where the pressure relief channel and the liquid cooling channel are designed independently, this application can simplify the process and increase processing efficiency.

[0073] In some embodiments, the second cold plate 300 has a plurality of second flow channels, so the second cold plate 110 can also be made of metal such as aluminum or copper. The plurality of second flow channels inside the second cold plate 300 are used for the flow of coolant. These second flow channels help increase the heat exchange area between the coolant and the first battery cell module 1001, thereby improving the heat exchange efficiency between them.

[0074] Please refer to Figure 10 , Figure 10 yes Figure 7The exploded view of the first housing shown. In some embodiments, the battery pack assembly 1000 includes a first CCS module 150 and a first thermally conductive adhesive layer 160. The first CCS module 150 is connected to the side of the first cell module 1001 facing away from the first cold plate 110, and the first thermally conductive adhesive layer 160 is bonded between the first CCS module 150 and the second cold plate 300.

[0075] The battery pack assembly 1000 includes a second CCS module and a second thermally conductive adhesive layer. The second CCS module is connected to the side of the second cell module 2001 facing away from the base plate 201, and the second thermally conductive adhesive layer is bonded between the second CCS module and the first cold plate 110.

[0076] A CCS module (i.e., Cell Contacting System) is a system used to ensure electrical connections and thermal management between battery cells, which is crucial for the performance and safety of the battery pack.

[0077] In some examples, the first CCS module 150 can be fixed to the first cell module 1001 by welding, so as to connect multiple first cells of multiple first cell modules 1001 in series or in parallel.

[0078] In some examples, the second CCS module can be fixed to the second cell module 2001 by welding to connect multiple second cells of the second cell module 2001 in series or in parallel.

[0079] In some examples, a first thermally conductive adhesive layer 160 is bonded between a first CCS module 150 and a second cold plate 300, which can conduct heat from the first receiving chamber to the second cold plate 300. A second thermally conductive adhesive layer is bonded between the second CCS module and the first cold plate 110, which can conduct heat from the second receiving chamber to the first cold plate 110.

[0080] Setting a thermally conductive adhesive layer between the cell module and the CCS module can fill the internal space of the battery and help the battery components conduct heat quickly and effectively. The thermally conductive adhesive layer can conduct heat from the battery to the first cold plate 110 or the second cold plate 300, preventing local overheating from damaging the cell module, thereby reducing the battery temperature and improving its working efficiency and safety.

[0081] In some embodiments, the battery pack assembly 1000 includes a sealing structure that ensures not only the safety and stability of the cell module under various environmental conditions, but also protects the battery from external factors (such as moisture, dust, and chemicals).

[0082] In some examples, the sealing structure may be disposed between the second cold plate 300 and the first frame 120, or between the first cold plate 110 and the first frame 120, to ensure the sealing of the first receiving chamber.

[0083] In some examples, a sealing structure may be provided between the first cold plate 110 and the second frame 220 to ensure the sealing of the second receiving chamber.

[0084] The sealing structure can be a sealing ring, sealing strip, etc., and the material of the sealing structure can be rubber (such as silicone rubber, fluororubber, nitrile rubber, etc.), thermoplastic elastomer, polyurethane, fluororubber, etc., which are not limited in this application.

[0085] In some embodiments, the second cell module 2001 includes a plurality of cylindrical cells arranged sequentially, each of the cylindrical cells being thermally connected to the first cold plate 110 along the axial direction.

[0086] Specifically, the axial direction is perpendicular to the first cold plate 110. Multiple cylindrical cells are thermally connected to the first cold plate 110 along the axial direction, which allows the heat of each cylindrical cell to be dissipated along the axial direction, thereby improving the heat dissipation efficiency of the second cell module 2001.

[0087] In some examples, the cells of the second cell module 2001 can also be square cells, which is not limited here.

[0088] Please refer to Figures 11-13 , Figure 11 yes Figure 7 The diagram shows the structure of the second box. Figure 12 yes Figure 11 The sectional view of the second box shown is shown. Figure 13 yes Figure 12 The diagram shows an enlarged view of part E. In some embodiments, the second frame 220 includes two opposing second end plates 221 and two opposing second side plates 222. Each second end plate 221 is connected between the two second side plates 222. The battery pack assembly 1000 also includes a second baffle 230, which is disposed in the second receiving cavity and spaced apart from a second end plate 221. The second baffle 230, the second end plate 221, and part of the second side plates 222 form a second pressure relief space 2300. The partition 130 has a second pressure relief port 2301, which connects to the second pressure relief channel 2010 and the second pressure relief space 2300. The second end plate 221 or any of the second side plates 222 has a second pressure relief outlet 2302, which connects to the second pressure relief space 2300 and the outside of the battery pack assembly 1000.

[0089] As mentioned above, the first pressure relief space 1400 can collect the gas in the first pressure relief channel 1301, and the second pressure relief space 2300 can also collect the gas in the second pressure relief channel 2010, so that the gas in the second pressure relief channel 2010 is discharged to the outside of the battery pack assembly 1000 through a pressure relief outlet.

[0090] Understandably, pressure relief spaces are provided in both the first enclosure 100 and the second enclosure 200 to ensure the overall pressure relief effect of the battery pack assembly 1000. The first explosion-proof valve 170 and the second explosion-proof valve can be located on the same side of the battery pack assembly 1000 or on different sides of the battery pack assembly 1000.

[0091] In some embodiments, the second pressure relief outlet 2302 is located on the second end plate 221, and the battery pack assembly 1000 further includes a second explosion-proof valve, which is installed on the second pressure relief outlet 2302.

[0092] In some examples, the second explosion-proof valve includes a second sealing plate and a second valve core, the second sealing plate being mounted on the second pressure relief outlet 2302, and the second valve core being connected to the second sealing plate and protruding toward the second baffle 230.

[0093] In some embodiments, the battery pack assembly 1000 further includes two second sealing members, which are disposed at both ends of the base plate 201. Under normal operating conditions, the second sealing members can ensure that the second pressure relief channel 2010 is in a closed state, preventing gas leakage under abnormal conditions, which would prevent the gas from passing through the second pressure relief outlet 2302 to the outside of the battery pack assembly 1000.

[0094] In some embodiments, the first housing 100 further includes a first connecting edge 123 and a second connecting edge 124. The first connecting edge 123 is connected to the top end of each first side panel 122, and the second connecting edge 124 is connected to the bottom end of each first side panel 122. When the first housing 100 is located at the top layer, the first connecting edge 123 is connected to the second cold plate 300, and the second connecting edge 124 is connected to the first connecting edge 123 of another first housing 100. When the first housing 100 is located at the middle layer, the first connecting edge 123 is connected to the second connecting edge 124 of another first housing 100, and the second connecting edge 124 is connected to the first connecting edge 123 of another housing.

[0095] In some examples, the first connecting edge 123 is also connected to the top of the first end plate 121, and the second connecting edge 124 is connected to the bottom of each first end plate 121. That is, the first connecting edge 123 is arranged around the top of the first frame 120, and the second connecting edge 124 is arranged around the bottom of the first frame 120.

[0096] In some examples, the first connecting edge 123 and the second connecting edge 124 can be connected by riveting, welding, screwing, etc., such as by studs, screws, or bolts. The first connecting edge 123 and the second cold plate 300 can be connected by riveting, welding, screwing, etc., such as by studs, screws, or bolts. This application does not limit this.

[0097] In some examples, the first connecting edge 123 and the second connecting edge 124 are detachably connected, and the first connecting edge 123 and the second cold plate 300 are detachably connected.

[0098] In some examples, the first connecting edge 123 and the second connecting edge 124 are non-detachable, and the first connecting edge 123 and the second cold plate 300 are non-detachable.

[0099] In some examples, when there are multiple first boxes 100 in the first box group, some of the first boxes 100 can be detachably connected, while some of the first boxes 100 can be non-detachably connected.

[0100] In some embodiments, the second housing 200 further includes a third connecting edge 223 and a fourth connecting edge 224. The third connecting edge 223 is connected to the top end of each second side plate 222 and each second end plate 221, and the fourth connecting edge 224 is connected to the bottom end of each second side plate 222 and each second end plate 221. The third connecting edge 223 is connected to the second connecting edge 124 of the first housing 100, and the fourth connecting edge 224 is used to support the battery pack assembly 1000.

[0101] In some examples, the third connecting edge 223 is also connected to the top of the second end plate 221, and the fourth connecting edge 224 is connected to the bottom of each second end plate 221. That is, the third connecting edge 223 is arranged around the top of the second frame 220, and the fourth connecting edge 224 is arranged around the bottom of the second frame 220.

[0102] The third connecting edge 223 and the second connecting edge 124 can be connected by riveting, welding, screwing, etc., such as by studs, screws, or bolts. This application does not limit the connection.

[0103] In some examples, the third connecting edge 223 and the second connecting edge 124 are detachable.

[0104] In some examples, the third connecting edge 223 and the second connecting edge 124 are non-detachable.

[0105] This application also provides an electrical device, which includes the battery pack assembly 1000 as described above. The electrical device can be an electric vehicle, power tool, electric bicycle, energy storage system, drone, mobile device, etc.

[0106] In some examples, the electrical equipment is an electric vehicle. Understandably, the power battery is the core of an electric vehicle, providing driving power. Excessive temperature inside the battery pack can easily lead to a fire hazard in the electric vehicle. The battery pack assembly 1000 provided in this application can reduce the heat impact caused by excessive temperature during battery depressurization, thereby improving the safety of the electrical equipment.

[0107] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery pack assembly, characterized by, The battery pack assembly comprises: a first cold plate; a first frame surrounding the first cold plate, the first frame and the first cold plate forming a first accommodating cavity; a first battery cell module arranged in the first accommodating cavity; a partition plate arranged in the first accommodating cavity and arranged between the first cold plate and the first battery cell module to support the first battery cell module, a side of the partition plate away from the first battery cell module being spaced apart from the first cold plate to form a first pressure relief channel, the first battery cell module being capable of relieving pressure through the first pressure relief channel.

2. The battery pack assembly of claim 1, wherein, The first frame comprises a first end plate and two first side plates arranged oppositely, the first end plate being connected between the two first side plates, and the battery pack assembly further comprises a first baffle plate arranged in the first accommodating cavity and spaced apart from the first end plate to form a first pressure relief space, the partition plate being provided with a first pressure relief opening, the first pressure relief opening being communicated with the first pressure relief channel and the first pressure relief space, and the first end plate or any of the first side plates being provided with a first pressure relief outlet, the first pressure relief outlet being communicated with the first pressure relief space and the outside of the battery pack assembly.

3. The battery pack assembly of claim 2, wherein, The first battery cell module comprises a plurality of first battery cells, each of the first battery cells comprising a first pressure relief portion, and the partition plate being provided with a plurality of first pressure relief holes, the first pressure relief portions of at least part of the first battery cells being arranged towards the first pressure relief holes, so that the first battery cells relieve pressure to the first pressure relief space through the first pressure relief holes.

4. The battery pack assembly of claim 2, wherein, The first pressure relief outlet is located on the first end plate, and the plurality of battery pack assemblies further comprises a first explosion-proof valve mounted on the first pressure relief outlet.

5. The battery pack assembly of claim 1, wherein, The battery pack assembly comprises a plurality of support ribs arranged in the first pressure relief channel, one end of the support ribs being connected to the first cold plate, and the other end of the support ribs being connected to the partition plate.

6. The battery pack assembly of any one of claims 1-5, wherein, The battery pack assembly further comprises: a bottom plate; a second frame surrounding the bottom plate and the first cold plate to form a second accommodating cavity; and a second battery cell module arranged in the second accommodating cavity, the bottom plate being used to support the second battery cell module, and the first cold plate being used to dissipate heat for the second battery cell module.

7. The battery pack assembly of claim 6, wherein, The first cold plate, the first frame and the partition plate form a first box body, the bottom plate and the second frame form a second box body, the battery pack assembly comprises a plurality of first box bodies, the plurality of first box bodies being stacked to form a first box body group, and the first box body group being stacked on the second box body.

8. The battery pack assembly of claim 7, wherein, The battery pack assembly further comprises a second cold plate covering the first box body located at the top end of the first box body group to close the first accommodating cavity.

9. The battery pack assembly of claim 8, wherein, The battery pack assembly comprises a first CCS module and a first heat-conducting adhesive layer, the first CCS module being connected to a side of the first battery cell module away from the first cold plate, and the first heat-conducting adhesive layer being arranged between the first CCS module and the second cold plate. The battery pack assembly comprises a second CCS module and a second thermal conductive adhesive layer, the second CCS module is connected to the side of the second battery cell module away from the bottom plate, and the second thermal conductive adhesive layer is arranged between the second CCS module and the first cold plate.

10. The battery pack assembly of claim 6, wherein, The second battery cell module comprises a plurality of cylindrical battery cells arranged in sequence, and each cylindrical battery cell is in thermal conductive connection with the first cold plate along the axial direction.

11. An electrical device, characterized by The power consumption device comprises the battery pack assembly according to any one of claims 1-10.

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