Battery pack and electric device

Abstract

The invention discloses a battery pack and an electric device, and belongs to the field of batteries. Comprising a frame body, the frame body is provided with a containing cavity with an opening, the opening is located in the end of the frame body in the first direction, the frame body is further provided with a pressure relief hole communicated with the containing cavity, and the pressure relief hole is used for being communicated with the outside; the bottom plate covers the opening in the first direction; the bearing plate is connected with the frame body, and the bearing plate is located in the containing cavity; the battery pack is located in the containing cavity and comprises a plurality of single batteries arranged in the third direction, each single battery comprises a top cover, an anti-explosion valve is arranged on the top cover, the top cover is arranged towards the bottom plate, the single batteries located on the two sides in the third direction are connected with the bearing plates, and the other single batteries located between the two bearing plates are connected with the bottom plate; the explosion-proof valves and the bottom plate form a plurality of first channels, and the explosion-proof valves of the plurality of battery monomers are in one-to-one correspondence with the plurality of first channels; a second channel is formed between the frame body and the bearing plate, the second channel is communicated with the multiple first channels, and the second channel is communicated with the pressure relief hole.

Description

Technical Field

[0001] The present application belongs to the field of batteries, and specifically relates to a battery pack and an electrical device. Background Art

[0002] With the development of science and technology, electric vehicles have gradually become a common means of transportation in people's daily lives, providing considerable convenience for people's daily appearance. Usually, a battery pack is installed in a battery car, which provides power to the electric car so that the electric car can run normally.

[0003] The battery pack includes a box body, in which at least one support beam such as a cross beam or a longitudinal beam is provided, which is used to improve the vibration mode of the battery pack when it is installed on the vehicle. However, the support beam provided in the box body will occupy a large space, which is not conducive to improving the energy density and volume utilization of the battery pack. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a battery pack and an electrical device, which at least solves the problem that the support beam occupies a large space in the box, which is not conducive to improving the energy density and volume utilization of the battery pack.

[0005] In a first aspect, an embodiment of the present application provides a battery pack, wherein the battery pack has a first direction, a second direction, and a third direction intersecting in pairs, and the battery pack includes:

[0006] A frame, wherein the frame is provided with a receiving cavity having an opening, wherein the opening is located at an end of the frame along the first direction, and the frame is further provided with a pressure relief hole communicating with the receiving cavity, wherein the pressure relief hole is used to communicate with the outside;

[0007] A bottom plate, covering the opening in the first direction;

[0008] A carrying plate connected to the frame, and the carrying plate is located in the accommodating cavity;

[0009] A battery pack is located in the accommodating cavity, the battery pack includes a plurality of battery cells arranged along the third direction, the battery cells include a top cover, the top cover is provided with an explosion-proof valve, the top cover is arranged toward the bottom plate, the battery cells located on both sides along the third direction are connected to the carrier plate, the remaining battery cells located between the two carrier plates are connected to the bottom plate, and form a plurality of first channels with the bottom plate, the explosion-proof valves of the plurality of battery cells correspond to the plurality of first channels one by one;

[0010] A second channel is formed between the frame and the carrying plate, the second channel is communicated with the plurality of first channels, and the second channel is communicated with the pressure relief hole.

[0011] Optionally, the frame includes two side panels, the two side panels are arranged opposite to each other along the third direction, the two side panels are provided with the supporting plate, and the battery pack includes a connecting piece, the connecting piece is located in the accommodating cavity, and is respectively connected to the side panels and the supporting plate to enclose the second channel.

[0012] Optionally, a connecting channel is provided between the supporting plate and the bottom plate along the first direction, the connecting channel is connected to the first channel, a connecting through hole penetrates the supporting plate along the first direction, and the second channel is connected to the connecting channel through the connecting through hole.

[0013] Optionally, there are multiple battery packs, the multiple battery packs are arranged along the second direction, the supporting plate is extended along the second direction, and there are multiple connecting through holes, which are opened on the supporting plate along the second direction.

[0014] Optionally, the sum of the cross-sectional areas of the communicating through holes is S, and the mass of the battery cell is M1, which satisfies: 0.001m 2 / kg≤S / M1≤1m 2 / kg.

[0015] Optionally, the first channel extends along the second direction, and ends of a plurality of the first channels along the second direction are all connected to the connecting channel.

[0016] Optionally, the frame body further includes two end plates, the two end plates are arranged opposite to each other along the second direction, the end plates are connected to the side plates, and the end plates are penetrated by the pressure relief holes.

[0017] Optionally, the frame body also includes a connecting plate, and the two end plates include a first beam portion and a second beam portion arranged opposite to each other along the second direction, the length of the first beam portion along the third direction is smaller than the length of the second beam portion along the third direction, the first beam portion is provided with the pressure relief hole, and the first beam portion is connected to the side plate via the connecting plate.

[0018] Optionally, there are multiple battery packs, the multiple battery packs are arranged along the second direction, the total weight of the multiple battery packs is M2, the thickness of the supporting plate is H, and satisfies: 10kg / mm≤M2 / H≤100kg / mm.

[0019] Optionally, the battery pack further includes a support member arranged along the second direction, the support member is arranged in the accommodating cavity, the battery cell is connected to the bottom plate through the support member, the support member, the top cover and the bottom plate adjacent to each other along the third direction enclose the first channel, and the explosion-proof valve is located in the first channel.

[0020] Optionally, the battery pack further includes a cooling liquid plate, which extends along the third direction and is fixedly connected to a plurality of battery cells arranged along the third direction.

[0021] Optionally, the battery cell further includes a large surface, the large surface is connected to the top cover, the large surface faces the second direction, and the cold liquid plate is connected to the large surface.

[0022] In a second aspect, an embodiment of the present application provides an electric device, wherein the electric device comprises a battery pack as described in any one of the first aspects.

[0023] In the embodiment of the present application, since the frame is provided with a receiving cavity having an opening, and the opening is located at the end of the frame along the first direction, the bottom plate can be covered on the opening in the first direction, so that the bottom plate and the frame are enclosed to form a relatively closed receiving cavity. Since the frame is connected with a bearing plate, and the bearing plate is located in the receiving cavity, when the battery pack is placed in the receiving cavity, the battery cells at both ends of the battery pack along the third direction can be connected to the bearing plate, and the remaining battery cells located between the two bearing plates are connected to the bottom plate, so that the bearing plate can carry the battery pack, so that the battery pack is equivalent to being fixed in the receiving cavity, and the battery pack can support the frame, so there is no need to set a support beam in the frame, that is, only the battery cells can be set in the frame, thereby improving the energy density and volume utilization of the battery pack, and making the vibration mode of the whole battery pack good. In addition, the remaining battery cells located between the two carrier plates form a plurality of first channels with the bottom plate, and the explosion-proof valves on the plurality of battery cells correspond to the plurality of first channels one by one. A second channel is formed between the frame 12 and the carrier plate, and the second channel is connected to the plurality of first channels, and the second channel is connected to the pressure relief hole, so that when the explosion-proof valve on the battery cell is opened, the gas in the battery cell can flow into the first channel, flow to the second channel, and finally flow out from the pressure relief hole, that is, the gas in the battery cell can flow out of the battery cell smoothly, avoiding the problem of excessive gas pressure in the battery cell and possible explosion. That is, in the embodiment of the present application, by setting the frame, the carrier plate and the battery pack, the frame can be supported by the battery pack, avoiding the setting of a support beam in the frame, thereby improving the energy density and volume utilization of the battery pack in the frame, and ensuring that the vibration mode of the whole battery pack is good, and the second channel is connected to the first channel, and the second channel is connected to the pressure relief hole, thereby ensuring that the safety of the battery pack is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 One of the exploded views of a battery pack provided in an embodiment of the present application is shown;

[0025] Figure 2A partial exploded view of a battery pack provided in an embodiment of the present application is shown;

[0026] Figure 3 A schematic diagram showing a connecting piece provided in an embodiment of the present application forming a second channel;

[0027] Figure 4 A cross-sectional view showing a battery pack provided by an embodiment of the present application along a distribution direction of multiple battery groups;

[0028] Figure 5 express Figure 4 A partial enlarged view of the middle A;

[0029] Figure 6 express Figure 4 A partial enlarged view of point B in the middle;

[0030] Figure 7 A partial cross-sectional view showing a battery pack provided by an embodiment of the present application along the distribution direction of multiple battery cells in a battery pack;

[0031] Figure 8 A schematic diagram showing that a first channel provided in an embodiment of the present application is connected to a connecting channel;

[0032] Fig. 9 A second exploded view of a battery pack provided in an embodiment of the present application is shown;

[0033] Fig.10 A schematic diagram showing a battery pack provided in an embodiment of the present application.

[0034] Reference numerals:

[0035] 001: first adhesive layer; 002: support member; 003: thermal conductive adhesive; 10: box body; 20: battery pack; 11: upper cover; 12: frame body; 13: bottom plate; 15: connector; 1001: accommodating chamber; 121: side plate; 122: end plate; 123: connecting plate; 124: bearing plate; 1224: first crossbeam; 1225: second crossbeam; 131: body; 132: connecting frame; 141: connecting through hole; 151: second channel; 21: cold liquid plate; 22: battery cell; 1221: pressure relief hole; 210: bottom wall; 220: top cover; 221: explosion-proof valve; 2201: large surface; 100: first channel; 101: connecting channel; X: first direction; Y: second direction; Z: third direction. DETAILED DESCRIPTION

[0036] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] like Figures 1 to 10As shown, the battery pack has a first direction X, a second direction Y and a third direction Z that intersect each other, and the battery pack includes: a frame 12, the frame 12 is provided with a receiving cavity 1001 with an opening, the opening is located at the end of the frame 12 along the first direction X, the frame 12 is also provided with a pressure relief hole 1221 connected to the receiving cavity 1001, and the pressure relief hole 1221 is used to communicate with the outside; a bottom plate 13, covering the opening in the first direction X; a carrying plate 124, connected to the frame 12, and the carrying plate 124 is located in the receiving cavity; a battery pack 20, located in the receiving cavity 1001, the battery pack 20 includes a plurality of battery cells 22 arranged along the third direction Z, The battery cell 22 includes a top cover 220, on which an explosion-proof valve 221 is provided. The top cover 220 is arranged toward the bottom plate 13. The battery cells 22 located on both sides along the third direction Z are connected to the carrier plate 124, and the remaining battery cells 22 located between the two carrier plates 124 are connected to the bottom plate 13, and form a plurality of first channels 100 with the bottom plate 13. The explosion-proof valves 221 of the plurality of battery cells 22 correspond one to one with the plurality of first channels 100. A second channel 151 is formed between the frame 12 and the carrier plate 124, the second channel 151 is connected to the plurality of first channels 100, and the second channel 151 is connected to the pressure relief hole 1221.

[0040] In the embodiment of the present application, since the frame 12 is provided with a accommodating cavity 1001 having an opening, and the opening is located at the end of the frame 12 along the first direction X, the bottom plate 13 can be covered on the opening in the first direction X, so that the bottom plate 13 and the frame 12 are enclosed to form a relatively closed accommodating cavity 1001. Since the frame 12 is connected to the supporting plate 124, and the supporting plate 124 is located in the accommodating cavity 1001, when the battery pack 20 is placed in the accommodating cavity 1001, the battery cells 22 located at both ends along the third direction Z in the battery pack 20 can be connected to the supporting plate 124, and the remaining battery cells 22 located between the two supporting plates 124 are connected to the bottom plate 13, so that the supporting plate 124 can carry the battery pack 20, and the battery pack 20 is equivalent to being fixed in the accommodating cavity 1001, and the battery pack 20 can support the frame 12, so that there is no need to set a support beam in the frame 12, that is, only the battery cells 22 can be set in the frame 12, thereby improving the energy density and volume utilization of the battery pack and making the vibration mode of the entire battery pack good. In addition, the remaining battery cells 22 located between the two supporting plates 124 form a plurality of first channels 100 with the bottom plate 13, the explosion-proof valves 221 on the plurality of battery cells 22 correspond one to one with the plurality of first channels 100, a second channel 151 is formed between the frame 12 and the supporting plate 124, the second channel 151 is connected with the plurality of first channels 100, and the second channel 151 is connected with the pressure relief hole 1221, so as to ensure that when the explosion-proof valve 221 on the battery cell 22 is opened, the gas in the battery cell 22 can flow into the first channel 100, flow to the second channel 151, and finally flow out from the pressure relief hole 1221, that is, to ensure that the gas in the battery cell 22 flows out of the battery cell 22 smoothly, so as to avoid the problem of excessive gas pressure in the battery cell 22 and possible explosion. That is, in the embodiment of the present application, by providing the frame 12, the supporting plate 124 and the battery pack 20, the frame 12 can be supported by the battery pack 20, avoiding the need to provide a support beam in the frame 12, thereby improving the energy density and volume utilization of the battery pack in the frame 12, and ensuring that the vibration mode of the entire battery pack is good, and the second channel 151 is connected to the first channel 100, and the second channel 151 is connected to the pressure relief hole 1221, thereby ensuring that the safety of the battery pack is effectively improved. In addition, in the embodiment of the present application, the bottom plate 13 and the frame 12 can also protect the battery pack 20, avoiding the problem of the battery pack 20 being easily damaged.

[0041] It should be noted that the frame 12 may also be connected to the upper cover 11, wherein the upper cover 11 may be detachably connected to the frame 12. Specifically, a first connection hole is provided on the upper cover 11, and the upper cover 11 is connected to the frame 12 by passing a screw through the first connection hole. Of course, the upper cover 11 and the frame 12 may also be fixedly connected. In addition, the bottom plate 13 may be detachably connected to the frame 12. Specifically, a second connection hole is provided on the bottom plate 13, and the upper cover 11 is connected to the frame 12 by passing a screw through the second connection hole. Of course, the bottom plate 13 and the frame 12 may also be fixedly connected.

[0042] In addition, in some embodiments, there are multiple battery packs 20, and the multiple battery packs 20 are arranged along the second direction Y. The total weight of the multiple battery packs 20 is M2, and the thickness of the carrier plate 124 is H, which satisfies: 10kg / mm≤M2 / H≤100kg / mm. By setting 10kg / mm≤M2 / H≤100kg / mm, it can be further ensured that the vibration mode of the entire battery pack is good.

[0043] It should be noted that the vibration mode of the whole pack is the natural frequency of the battery pack. After the battery pack is installed in the vehicle, if the vehicle has the same frequency as the road surface when the vehicle is driving, a large vibration will be generated, affecting the reliability of the vehicle. Similarly, if the natural frequency of the battery pack is the same as the frequency of the road surface, the battery pack will generate a large vibration. In the embodiment of the present application, by setting 10kg / mm≤M2 / H≤100kg / mm, the vibration mode of the whole battery pack can be ensured to be good.

[0044] In addition, in the embodiment of the present application, when M2 / H is less than 10, the thickness H of the supporting plate 124 will be too large, resulting in material waste; when M2 / H is greater than 100, the total weight of the multiple battery packs 20 is M2 which is too large, and the thickness H of the supporting plate 124 will be insufficient, which will affect the vibration mode of the entire battery pack.

[0045] In addition, taking Table 1 as an example, a specific description is given below on how 10kg / mm≤M2 / H≤100kg / mm ​​makes the vibration mode of the entire battery pack good, wherein the data in Table 1 is obtained by simulating the vibration mode of the entire battery pack and the parameters according to simulation.

[0046] Table 1

[0047]

[0048]

[0049] It can be seen from Table 1 that when the ratio of M2 / H is between 10 and 100, the vibration mode of the whole battery pack is between 50-80Hz, so that the vibration mode of the whole battery pack is good. When the ratio of M2 / H is less than 10, although the vibration mode of the whole battery pack meets the requirements, it will cause the thickness of the carrier plate 124 to be larger, affecting the size of the battery pack. When M2 / H is greater than 100, the vibration mode of the whole battery pack is too small, resulting in large vibration of the battery pack when the battery pack is installed in the vehicle and the vehicle is moving, and the thickness of the carrier plate 124 will also be insufficient. Among them, if the natural frequency of the battery pack is the same as the frequency of the road surface, the battery pack will produce a larger vibration, so it is generally required that the vibration mode of the whole battery pack is above 40Hz, and the larger the better.

[0050] For example, when the ratio of M2 / H is 5, the vibration mode of the whole battery pack is 80, which meets the requirements, but the thickness of the carrier plate 124 is 60 mm, and the thickness of the carrier plate 124 is too large, resulting in the battery pack being too large. When the ratio of M2 / H is 200, the vibration mode of the whole battery pack is 18. At this time, the vibration mode of the whole battery pack is too small. Therefore, it can be seen from Table 1 that when the ratio of M2 / H is between 10 and 100, the vibration mode of the whole battery pack is good.

[0051] In addition, in the embodiment of the present application, a plurality of battery packs 20 may be arranged along the second direction Y, and a plurality of battery cells 22 in each battery pack 20 may be arranged along the third direction Z.

[0052] In addition, in some embodiments, the frame 12 includes two side panels 121, and the two side panels 121 are arranged opposite to each other along the third direction Z. A supporting plate 124 is provided on each of the two side panels 121. The battery pack may also include a connector 15, and the connector 15 is located in the accommodating cavity. The connector 15 is respectively connected to the side panels 121 and the supporting plate 124 to enclose a second channel 151.

[0053] Since the two side plates 121 are provided with a bearing plate 124, the two opposite ends of the battery pack 20 along the third direction Z are respectively connected to the bearing plates 124 on the two side plates 121, and the bearing plates 124 on the two side plates 121 respectively carry the battery cells 22 at the two opposite ends of the battery pack along the third direction Z. Since the connector 15 is respectively connected to the side plates and the bearing plate 124 to enclose and form the second channel 151, once the gas pressure in the battery cell 22 is relatively high during the use of the battery pack, the battery cell 22 can discharge the smoke in the battery cell 22 through the explosion-proof valve 221 to reduce the gas pressure in the battery cell 22. After entering the first channel 100, the discharged smoke can enter the second channel 151, so that the gas pressure in the battery cell 22 is effectively reduced, and the smoke discharged from the battery cell 22 can flow smoothly after flowing out of the battery cell 22, ensuring the safety of the battery cell 22. In addition, once the smoke exhausted from the battery cell 22 enters the second channel 151, it will flow to the pressure relief hole 1221 and then flow to the outside of the frame 12, thereby avoiding the problem of excessive air pressure in the frame 12. When the air pressure in the battery cell 22 is relatively high, the gas in the battery cell 22 can have a discharge path, thereby avoiding the problem of explosion of the battery cell 22 due to the high air pressure, thereby improving the safety of the battery pack.

[0054] In addition, in the embodiment of the present application, during the use of the battery cell 22, once the air pressure in the battery cell 22 is relatively high, the explosion-proof valve 221 will open, allowing the gas in the battery cell 22 to flow out from the explosion-proof valve 221, thereby reducing the air pressure in the battery cell 22, thereby avoiding the problem of the battery cell 22 exploding due to the high air pressure.

[0055] In addition, in the embodiment of the present application, each battery pack 20 is connected to the upper cover 11 and the bottom plate 13 respectively, so that the battery pack 20 can support the upper cover 11 and the bottom plate 13, that is, the battery pack 20 can support the battery pack, and further avoid setting a support beam in the frame 12, so that the battery pack can achieve the effect of no support beam, so that the number of battery cells 22 can be increased, and the energy density and volume utilization of the battery pack can be improved. Among them, when the battery pack 20 includes battery cells 22, the battery cells 22 can be connected to the upper cover 11 and the bottom plate 13 respectively, that is, the battery cells 22 can be bonded to the upper cover 11 and the bottom plate 13 respectively by adhesive.

[0056] In addition, in the embodiment of the present application, one end of the connector 15 is connected to the side plate 121, and the other end is connected to the carrier plate 124. Through such a configuration, the connector 15 can strengthen the connection between the side plate 121 and the carrier plate 124, and the connector 15 can improve the strength of the frame 12, that is, by providing the connector 15, on the one hand, the strength of the frame 12 can be improved, that is, the strength of the battery pack can be improved, and on the other hand, the connection between the side plate 121 and the carrier plate 124 can be made more secure.

[0057] It should be noted that in the embodiment of the present application, the connecting member 15 may be a reinforcing plate. Of course, the connecting member 15 may also be other types of structures, for example, the connecting member 15 is a reinforcing rib. The specific type of the connecting member 15 is not limited in the embodiment of the present application.

[0058] In addition, in some embodiments, the battery pack may further include a support member 002 arranged along the second direction Y, the support member 002 is arranged in the accommodating cavity, the battery cell 20 is connected to the bottom plate 13 through the support member 002, and the support member 002, the top cover 220 and the bottom plate 13 adjacent along the third direction Z enclose a first channel 100, and the explosion-proof valve 221 is located in the first channel 100.

[0059] By setting the support member 002, the support member 002 can support the battery cell 22, that is, the support member 002 supports the battery cell 22 in the first direction X, so that the battery cell 22 can be supported in the first direction X, and the support member 002 can avoid the explosion-proof valve 221 on the battery cell 22, so that when the explosion-proof valve 221 discharges the gas in the battery cell 22, the support member 002 will not affect the exhaust of the battery cell 22 through the explosion-proof valve 221. In addition, two adjacent support members 002, the battery cell 22 and the bottom plate 13 can be enclosed to form a first channel 100, that is, the gap between the two adjacent support members 002 can constitute the first channel 100, so that the gas discharged from the explosion-proof valve 221 of the battery cell 22 can enter the first channel 100, and the first channel 100 is connected to the second channel 151, so that once the gas discharged from the battery cell 22 enters the first channel 100, it can flow to the second channel 151, and finally flow to the outside of the battery pack, so that the smoke discharged from the single battery 22 can flow quickly, thereby improving the safety of the battery pack.

[0060] In addition, the explosion-proof valve 221 on the battery cell 22 can face the gap between two adjacent support members 002, so that the support members 002 avoid the explosion-proof valve 221. That is, by providing the support members 002, it is convenient to form the first channel 100, and then facilitate the gas discharged from the battery cell 22 to flow into the second channel 151 and be discharged to the outside of the battery pack.

[0061] It should be noted that in the embodiment of the present application, the support member 002 may be a glue layer. By setting the support member 002 as a glue layer, the number of parts used to set a separate exhaust channel in the box is reduced, thereby reducing the cost of the battery pack. Of course, the support member 002 may also be a plate-type structure. The specific type of the support member 002 is not limited in the embodiment of the present application.

[0062] In addition, in the embodiment of the present application, multiple battery cells 22 are arranged along the second direction Y or the third direction Z to form a battery pack 20, the number of support members 002 is multiple, the multiple support members 002 are located between two supporting plates 124, and the multiple support members 002 are arranged along the arrangement direction of the battery pack 20.

[0063] In addition, in some embodiments, the first channel 100 extends along the second direction Y; along the first direction X, a connecting channel 101 is provided between the supporting plate 124 and the bottom plate 13, the connecting channel 101 is connected to the first channel 100, and a connecting through hole 141 penetrates the supporting plate 124 along the first direction X, and the second channel 151 is connected to the connecting channel 101 through the connecting through hole 141.

[0064] Since a communication channel 101 is disposed between the support plate 124 and the bottom plate 13 , and the communication channel 101 is communicated with the first channel 100 , the gas of the battery cell 22 can flow to the communication channel 101 after entering the first channel 100 . Since the supporting plate 124 is penetrated with the communicating through hole 141 along the first direction X, the communicating channel 101 can be communicated with the communicating through hole 141. Therefore, it is equivalent to that the second channel 151 is communicated with the communicating channel 101 through the communicating through hole 141, and the end of the first channel 100 along the second direction Y is communicated with the communicating channel 101. Once the gas pressure in the battery cell 22 is too high, the explosion-proof valve 221 on the battery cell 22 will open, so that the gas in the battery cell 22 flows out from the explosion-proof valve 221, so that the gas in the battery cell 22 can flow into the first channel 100, and flow into the communicating channel 101 between the supporting plate 124 and the bottom plate 13 through the first channel 100, and then enter the second channel 151 through the communicating through hole 141 on the supporting plate 124, so that the gas flowing into the second channel 151 finally flows from the pressure relief hole 1221 to the outside of the frame 12, ensuring that the gas discharged from the battery cell 22 is less gathered inside the frame 12, thereby improving the safety of the battery pack. That is, by providing the communication channel 101 between the carrier plate 124 and the bottom plate 13 , it can be ensured that the gas discharged from the battery cells 22 can be effectively transferred to the outside of the frame 12 , thereby improving the safety of the battery pack.

[0065] In addition, in the embodiment of the present application, the top cover 200 of some battery cells 22 can be connected to the supporting plate 124, so that the supporting plate 124 can also support some battery cells 22, so that the battery cells 22 can have more support inside the frame 12.

[0066] In addition, multiple support members 002 are arranged along the third direction Z to ensure that the battery pack 20 is supported on the support members 002, so that the gas discharged from the battery cells 22 in the battery pack can enter the first channel 100, making it easier for the gas discharged from the battery cells 22 to be discharged to the outside of the battery pack.

[0067] In addition, in some embodiments, there are multiple battery packs 20, the multiple battery packs 20 are arranged along the second direction Y, the supporting plate 124 is extended along the second direction Y, the number of connecting through holes 141 is multiple, and the multiple connecting through holes 141 are opened along the second direction Y on the supporting plate 124.

[0068] Through such a configuration, the smoke exhausted from the single battery 22 can quickly enter the second channel 151 through the multiple communication holes 141 after entering the first channel 100, thereby avoiding the problem of smoke gathering in the first channel 100 and causing the safety of the battery pack to decrease. That is, by providing multiple communication holes 141, it is possible to ensure that the smoke exhausted from the single battery 22 quickly enters the second channel 151, and then flows from the second channel 151 to the pressure relief hole 1221 and is discharged to the outside of the battery pack, thereby improving the safety of the battery pack.

[0069] In addition, in some embodiments, the first channel 100 extends along the second direction Y, and the ends of the plurality of first channels 100 along the second direction Y are all connected to the connecting channel 101. Through such a configuration, once the battery cells 22 in each battery pack 20 in the plurality of battery packs 20 discharge gas, the discharged gas can enter the corresponding first channel 100, thereby entering the connecting channel 101, and finally entering the second channel 151 and being discharged from the pressure relief hole 1221 to the outside of the frame 12. That is, by configuring the ends of the plurality of first channels 100 along the second direction Y to be connected to the connecting channel 101, it can be ensured that when the battery cells 22 in any battery pack 20 discharge gas, the gas can be discharged to the outside of the battery pack, thereby improving the safety of the battery pack.

[0070] Among them, the battery groups 20 in the battery pack can correspond one-to-one to the first channels 100, that is, when the number of battery groups 20 is multiple, the number of first channels 100 is also multiple, and the connecting through holes 141 correspond one-to-one to the first channels 100, and the number of connecting through holes 141 is also multiple.

[0071] In addition, in some embodiments, the base plate 13 may include a main body 131 and a connecting frame 132, the connecting frame 132 is arranged around the outer periphery of the main body 131, the connecting frame 132 protrudes in the direction close to the frame body 12 along the first direction X, the connecting frame 132 is connected to the frame body 12, the main body 131 and the supporting plate 124 are spaced apart along the first direction X, and a connecting channel 101 is formed between the main body 131 and the supporting plate 124.

[0072] With such a configuration, the connection frame 132 protrudes from the body 131, and the connection frame 132 is connected to the frame 12, so that the bottom plate 13 and the frame 12 can be connected more firmly. That is, with such a configuration, once the battery cell 22 is exhausted, the gas exhausted by the battery cell 22 can flow into the communication channel 101 between the body 131 and the carrier plate 124, and when the communication through hole 141 is provided on the carrier plate 124, after the gas flows into the communication channel 101, it can enter the second channel 151 and finally be discharged to the outside of the battery pack.

[0073] In addition, in some embodiments, the frame 12 may further include two end plates 122, which are arranged opposite to each other along the second direction Y, connected to the side plates 121, and having pressure relief holes 1221 running through the end plates 122. The second channel 151 is connected to the outside of the frame 12 through the pressure relief holes 1221.

[0074] Since the end plate 122 is penetrated by the pressure relief hole 1221, the second channel 151 can be connected to the outside of the frame 12 through the pressure relief hole 1221. Therefore, once the gas discharged from the battery cell 22 enters the second channel 151, the gas can flow to the outside of the frame 12 through the pressure relief hole 1221, thereby ensuring that there is less gas inside the frame 12 and ensuring the safety of the battery pack.

[0075] In addition, through such a configuration, once the explosion-proof valve 221 in the battery cell 22 releases pressure, the gas in the battery cell 22 will enter the first channel 100, and the gas will flow in the first channel 100 until it flows into the connecting channel 101, and then flows to the connecting hole 141 on the supporting plate 124, and the gas passes through the connecting hole 141 into the second channel 151, and then the gas will flow in the second channel 151 until it flows to the pressure relief hole 1221, and the gas will flow from the pressure relief hole 1221 to the outside of the frame 12. That is, through such a setting, the gas pressure in the battery cell 22 can be relatively high. When the battery cell 22 is exhausted through the explosion-proof valve 221, the gas exhausted from the battery cell 22 can flow to the outside of the battery pack through the first channel 100, the connecting channel 101, the connecting through hole 141, the second channel 151 and the pressure relief hole 1221, thereby avoiding the gas in the battery cell 22 from accumulating inside the battery pack, which may cause the gas pressure in the battery pack to be relatively high and the battery pack to be prone to explosion, thereby improving the safety of the battery pack.

[0076] In addition, the frame 12 may also include a connecting plate 123, and the two end plates 122 include a first beam portion 1224 and a second beam portion 1225 that are relatively arranged along the second direction Y. The length of the first beam portion 1224 along the third direction Z is less than the length of the second beam portion 1225 along the third direction Z. The first beam portion 1124 is provided with a pressure relief hole 1221, and the first beam portion 1124 is connected to the side plate 121 via the connecting plate 123.

[0077] Since the first crossbeam is provided with a pressure relief hole 1221, the first crossbeam is connected to the side plate 121 through the connecting plate 123, so that the side plate 121 can be connected to the end plate 122 through the connecting plate 123, so that the structural stability of the entire frame 12 is improved. The connecting plate 123 is arranged to be inclined with the end plate 122 and the side plate 121, so that the gas in the frame 12 can be guided from the side plate 121 to the end plate 122, so that the gas is discharged from the pressure relief hole 1221 on the end plate 122, and other battery cells 22 will not be damaged by high temperature. In addition, the first crossbeam 1124 is provided with a pressure relief hole 1221, so as to ensure that the inside of the battery pack is connected to the outside, so that the smoke discharged from the battery cell 20 inside the battery pack can be transmitted to the outside of the battery pack through the pressure relief hole 1221, so as to avoid the problem of excessive air pressure inside the battery pack and reduced safety of the battery pack.

[0078] In addition, in some embodiments, the sum of the cross-sectional areas of the communicating through holes 141 is S, and the mass of one battery cell 22 is M1, which satisfies: 0.001m 2 / kg≤S / M1≤1m 2 / kg. With such a setting, the vibration mode of the whole battery pack can be made good. Among them, when S / M1 is less than 0.001, the gas emission of thermal runaway of the battery pack cannot be met, and the gas will stay in the bottom space inside the battery pack for a long time, causing a large change in air pressure, triggering a secondary reaction, and affecting the power supply effect of the battery pack; when S / M1 is greater than 1, the gas emission of thermal runaway of the battery pack can be met, but the opening cross-sectional area of ​​the connecting through hole 141 is too large, which weakens the strength of the supporting plate 124, and even makes the strength of the frame of the battery pack greatly reduced, affecting the vibration mode of the whole battery pack.

[0079] Taking Table 2 and Table 3 as examples, for 0.001m 2 / kg≤S / M1≤1m 2 / kg makes the vibration mode of the whole battery pack good, and a specific explanation is given, wherein the data in Table 2 and Table 3 are the data obtained by simulation.

[0080] Table 2

[0081]

[0082] Table 3

[0083]

[0084]

[0085] It can be seen from Table 2 and Table 3 that when the ratio of S / M1 is between 0.001 and 1, the vibration mode of the whole battery pack is between 40-50Hz, so that the vibration mode of the whole battery pack is good. When S / M1 is greater than 1, the vibration mode of the whole battery pack is too small, resulting in large vibration of the battery pack when the vehicle is moving after the battery pack is installed in the vehicle, and the thickness of the load-bearing plate will also be insufficient. Among them, if the natural frequency of the battery pack is the same as the frequency of the road surface, the battery pack will produce a large vibration, so it is generally required that the vibration mode of the whole battery pack is above 40Hz, and the larger the better.

[0086] In addition, the battery cells 22 at the end of each battery pack 2 in the plurality of battery packs 20 may be bonded to the carrier plate 124 , or opposite ends of the cold liquid plate 21 along the third direction Z may be bonded to the carrier plate 124 , respectively.

[0087] In addition, in some embodiments, the battery cell 22 may further include a bottom wall 210 , which is disposed opposite to the top cover 220 along the first direction X, that is, the bottom wall 210 faces the top cover 220 , and a pole is disposed on the bottom wall 210 .

[0088] Since the bottom wall 210 is provided with a pole, other components inside the battery pack can be connected through the pole, so that the power of the battery cell 22 is transmitted to other components through the pole. That is, by providing the pole, it is convenient to power the battery pack. Among them, the pole can include a positive pole and a negative pole. The pole is arranged toward the top cover 220, and when thermal runaway occurs, it will not affect the pole, and the safety is good.

[0089] In addition, in some embodiments, the battery pack 20 further includes a cold liquid plate 21 , which extends along the third direction Z and is fixedly connected to a plurality of battery cells 22 arranged along the third direction Z.

[0090] Since the cold liquid plate 21 extends along the third direction Z and is fixedly connected to the plurality of battery cells 22, once the battery cells 22 generate heat, the heat can be quickly transferred to the cold liquid plate 21, and the cold liquid plate 21 can absorb the heat of the battery cells 22 to avoid the problem of overheating of the battery cells 22. That is, by providing the cold liquid plate 21, the safety of the battery pack can be effectively improved.

[0091] It should be noted that a plurality of battery cells 22 may be arranged along the third direction Z to form a battery pack 20 , the cold liquid plate 21 may extend along the third direction Z, and a plurality of battery packs 20 may be arranged along the second direction Y.

[0092] In addition, in some embodiments, the battery cell 22 may further include a large surface 2201 , the large surface 2201 is connected to the top cover 220 , the large surface 2201 faces the second direction Y, and the cold liquid plate 21 is connected to the large surface 2201 .

[0093] Through such a configuration, the heat generated by the battery cell 22 can be transferred to the cold liquid plate 21 to the maximum extent, and the cold liquid plate 21 can transfer as much heat generated by the battery cell 22 as possible, which is beneficial to the heat dissipation of the battery cell 22, that is, the cold liquid plate 21 is connected to the large surface, which can improve the heat dissipation efficiency of the battery cell 22, thereby improving the heat dissipation efficiency of the battery pack. In addition, the large surface 2201 is connected to the top cover 220, which can also make the battery cell 22 more firmly fixed in the battery pack.

[0094] It should be noted that the cold liquid plate 21 can be bonded to the large surface through the thermal conductive adhesive 003, so that the heat of the battery cell 22 can be quickly transferred to the cold liquid plate 21. Among them, the strength of the adhesive connection of the thermal conductive adhesive 003 is A, the thickness of the thermal conductive adhesive 003 is t, and 0.1≤A / t≤300MPa / mm. If A / t<0.1, the adhesive strength of the thermal conductive adhesive 003 is insufficient, resulting in loose adhesion, the battery cell and the cold liquid plate 21 may be separated, and the adhesive thickness of the adhesive is too large, which is not conducive to heat conduction; if A / t>300, the adhesive strength of the thermal conductive adhesive 003 is too large, and the cost of the thermal conductive adhesive 003 is too high.

[0095] In addition, in some embodiments, the battery pack may have a second direction Y intersecting with the first direction X; the battery pack also includes a first adhesive layer 001, the battery cell 22 is bonded to the carrier plate 124 through the first adhesive layer 001, and the thickness of the first adhesive layer 001 along the first direction X ranges from 1 mm to 10 mm; and / or, the battery pack may also include a second adhesive layer, the cold liquid plate 21 is bonded to the carrier plate through the second adhesive layer, and the thickness of the second adhesive layer along the first direction ranges from 1 mm to 10 mm.

[0096] Through such a configuration, no matter whether the battery cell 22 is bonded to the carrier plate 124 through the first adhesive layer 001 or the cold liquid plate 21 is bonded to the carrier plate 124 through the second adhesive layer, the size of the battery pack in the first direction X can be made smaller, thereby avoiding the problem of a larger size of the battery pack due to a larger thickness of the first adhesive layer 001 or the second adhesive layer.

[0097] It should be noted that the thickness of the first adhesive layer 001 along the first direction X can be any value between 1 mm and 10 mm, for example, the thickness of the first adhesive layer 001 is 1 mm, for example, the thickness of the first adhesive layer 001 is 3 mm, for example, the thickness of the first adhesive layer 001 is 5 mm, for example, the thickness of the first adhesive layer 001 is 7 mm, for example, the thickness of the first adhesive layer 001 is 10 mm. In addition, the thickness of the second adhesive layer along the first direction X can be any value between 1 mm and 10 mm, for example, the thickness of the second adhesive layer is 1 mm, for example, the thickness of the second adhesive layer is 3 mm, for example, the thickness of the second adhesive layer is 5 mm, for example, the thickness of the second adhesive layer is 7 mm, for example, the thickness of the second adhesive layer is 10 mm.

[0098] In addition, in some embodiments, the battery pack may further include a plurality of exhaust members, which are located between the battery cell 22 and the main body 131, and one end of the exhaust member is connected to the main body 131, and the other end supports the battery cell 22; the exhaust member is provided with an exhaust port connected to the first channel at one end facing the battery cell 22, and the exhaust port is arranged opposite to the explosion-proof valve 221, and the explosion-proof valve 221 can be connected to the first channel through the exhaust port.

[0099] Through such a setting, the exhaust member will first support the battery cell 22, that is, the exhaust member will support the battery cell 22 in the first direction X, so that the battery cell 22 can be better supported in the first direction X. Secondly, the exhaust port on the exhaust member is arranged opposite to the explosion-proof valve 221, so that when the explosion-proof valve 221 on the battery cell 22 is exhausted, the gas discharged from the battery cell 22 will flow into the exhaust port of the exhaust member, and the exhaust port is connected to the first channel 100, so that after the gas enters the exhaust port, the gas will flow into the first channel 100 through the exhaust port, and finally the gas will flow to the outside of the battery pack. That is, by setting the exhaust member, the gas discharged from the battery cell 22 can be discharged to the first channel 100 through the exhaust port on the exhaust member, and finally discharged to the outside of the battery pack through the first channel 100, avoiding the problem of high air pressure or gas accumulation in the battery pack.

[0100] It should be noted that the exhaust member may be a columnar structure. Of course, the exhaust member may also be a block structure. The specific type of the exhaust member is not limited in the embodiments of the present application.

[0101] In the embodiment of the present application, since the frame 12 is provided with a accommodating cavity 1001 having an opening, and the opening is located at the end of the frame 12 along the first direction X, the bottom plate 13 can be covered on the opening in the first direction X, so that the bottom plate 13 and the frame 12 are enclosed to form a relatively closed accommodating cavity 1001. Since the frame 12 is connected to the supporting plate 124, and the supporting plate 124 is located in the accommodating cavity 1001, when the battery pack 20 is placed in the accommodating cavity 1001, the battery cells 22 located at both ends along the third direction Z in the battery pack 20 can be connected to the supporting plate 124, and the remaining battery cells 22 located between the two supporting plates 124 are connected to the bottom plate 13, so that the supporting plate 124 can carry the battery pack 20, and the battery pack 20 is equivalent to being fixed in the accommodating cavity 1001, and the battery pack 20 can support the frame 12, so that there is no need to set a support beam in the frame 12, that is, only the battery cells 22 can be set in the frame 12, thereby improving the energy density and volume utilization of the battery pack and making the vibration mode of the entire battery pack good. In addition, the remaining battery cells 22 located between the two supporting plates 124 form a plurality of first channels 100 with the bottom plate 13, the explosion-proof valves 221 on the plurality of battery cells 22 correspond one to one with the plurality of first channels 100, a second channel 151 is formed between the frame 12 and the supporting plate 124, the second channel 151 is connected with the plurality of first channels 100, and the second channel 151 is connected with the pressure relief hole 1221, so as to ensure that when the explosion-proof valve 221 on the battery cell 22 is opened, the gas in the battery cell 22 can flow into the first channel 100, flow to the second channel 151, and finally flow out from the pressure relief hole 1221, that is, to ensure that the gas in the battery cell 22 flows out of the battery cell 22 smoothly, so as to avoid the problem of excessive gas pressure in the battery cell 22 and possible explosion. That is, in the embodiment of the present application, by providing the frame 12, the supporting plate 124 and the battery pack 20, the frame 12 can be supported by the battery pack 20, avoiding the need to provide a support beam in the frame 12, thereby improving the energy density and volume utilization of the battery pack in the frame 12, and ensuring that the vibration mode of the entire battery pack is good, and the second channel 151 is connected to the first channel 100, and the second channel 151 is connected to the pressure relief hole 1221, thereby ensuring that the safety of the battery pack is effectively improved. In addition, in the embodiment of the present application, the bottom plate 13 and the frame 12 can also protect the battery pack 20, avoiding the problem of the battery pack 20 being easily damaged.

[0102] An embodiment of the present application provides an electrical device, which includes a battery pack as described in any of the above embodiments.

[0103] It should be noted that in the embodiment of the present application, the electric device may be a vehicle, and of course, the electric device may also be other mechanical equipment that requires a battery. The embodiment of the present application does not limit the specific type of the electric device.

[0104] Since the present application not only improves the energy density and volume utilization of the battery pack, but also improves the overall rigidity of the battery pack, it is suitable for battery packs where no mounting structure is provided above the upper cover 11, such as CTB (Cell To Body) or CTC (Cell to Chassis) and other battery-body integrated electrical devices.

[0105] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0106] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: The battery pack has a first direction, a second direction and a third direction intersecting in pairs, and the battery pack includes: A frame body, wherein the frame body is provided with a receiving cavity having an opening, wherein the opening is located at an end of the frame body along the first direction, and the frame body is further provided with a pressure relief hole communicating with the receiving cavity, wherein the pressure relief hole is used to communicate with the outside; A bottom plate, covering the opening in the first direction; A carrying plate connected to the frame, and the carrying plate is located in the accommodating cavity; A battery pack is located in the accommodating cavity, the battery pack includes a plurality of battery cells arranged along the third direction, the battery cells include a top cover, the top cover is provided with an explosion-proof valve, the top cover is arranged toward the bottom plate, the battery cells located on both sides along the third direction are connected to the carrier plate, the remaining battery cells located between the two carrier plates are connected to the bottom plate, and form a plurality of first channels with the bottom plate, the explosion-proof valves of the plurality of battery cells correspond to the plurality of first channels one by one; A second channel is formed between the frame and the carrying plate, the second channel is communicated with the plurality of first channels, and the second channel is communicated with the pressure relief hole.

2. The battery pack according to claim 1, characterized in that: The frame includes two side panels, which are arranged opposite to each other along the third direction, and the supporting plate is arranged on the two side panels. The battery pack includes a connecting piece, which is located in the accommodating cavity and is respectively connected with the side panels and the supporting plate to enclose the second channel.

3. The battery pack according to claim 1, characterized in that: Along the first direction, a communication channel is provided between the supporting plate and the bottom plate, the communication channel is communicated with the first channel, a communication through hole penetrates the supporting plate along the first direction, and the second channel is communicated with the communication channel through the communication through hole.

4. The battery pack according to claim 3, characterized in that: There are multiple battery packs, which are arranged along the second direction. The carrier plate is extended along the second direction. There are multiple communicating through holes, which are opened on the carrier plate along the second direction.

5. The battery pack according to claim 3, characterized in that: The sum of the cross-sectional areas of the communicating through holes is S, and the mass of the battery cell is M1, which satisfies: 0.001m 2 / kg≤S / M1≤1m 2 / kg.

6. The battery pack according to claim 3, characterized in that: The first channel extends along the second direction, and ends of a plurality of the first channels along the second direction are all communicated with the communication channel.

7. The battery pack according to claim 2, characterized in that: The frame body further includes two end plates, which are arranged opposite to each other along the second direction, are connected to the side plates, and are penetrated by the pressure relief holes.

8. The battery pack according to claim 7, characterized in that: The frame also includes a connecting plate, and the two end plates include a first beam portion and a second beam portion arranged opposite to each other along the second direction, the length of the first beam portion along the third direction is smaller than the length of the second beam portion along the third direction, the first beam portion is provided with the pressure relief hole, and the first beam portion is connected to the side plate through the connecting plate.

9. The battery pack according to claim 1, characterized in that: The number of the battery packs is multiple, the multiple battery packs are arranged along the second direction, the total weight of the multiple battery packs is M2, the thickness of the supporting plate is H, and satisfies: 10kg / mm≤M2 / H≤100kg / mm.

10. The battery pack according to claim 1, characterized in that: The battery pack also includes a support member arranged along the second direction, the support member is arranged in the accommodating cavity, the battery cell is connected to the bottom plate through the support member, the support member, the top cover and the bottom plate adjacent to each other along the third direction enclose the first channel, and the explosion-proof valve is located in the first channel.

11. The battery pack according to claim 1, characterized in that: The battery pack further includes a cold liquid plate extending along the third direction and fixedly connected to a plurality of battery cells arranged along the third direction.

12. The battery pack according to claim 11, characterized in that: The battery cell further includes a large surface, the large surface is connected to the top cover, the large surface faces the second direction, and the cold liquid plate is connected to the large surface.

13. An electrical device, characterized in that: The electrical device comprises a battery pack as claimed in any one of claims 1 to 12.

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