Battery pack

Abstract

The invention discloses a battery pack, and belongs to the technical field of batteries. Comprising a shell, a battery module and a heat-conducting structural adhesive, the shell is provided with an accommodating space, and the battery module is arranged in the accommodating space; the battery module comprises a plurality of battery cells, the plurality of battery cells are arranged in an array along a first direction and a third direction, each battery cell comprises a body, a positive electrode and a negative electrode, and the positive electrode and the negative electrode are arranged at two ends of the body along a second direction; the heat-conducting structural adhesive is filled between the body and the shell along the first direction, and is filled between two adjacent bodies along the second direction and the third direction. The heat-conducting structural adhesive is concentrated in the middle of the plurality of battery cells, so that the plurality of battery cells can be connected together through the heat-conducting structural adhesive, and when a single battery cell emits heat, heat is transferred to the whole heat-conducting structural adhesive along with the local heat-conducting structural adhesive at the position in contact with the body and is transferred outwards, so that the heat of the whole part of the plurality of battery cells is uniform; and the service life of the battery cell is prolonged.

Description

Technical Field

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

[0002] At present, the new energy industry is developing rapidly. As the core of the development of electric vehicles, medical care, energy storage equipment and other industries, the various performance of battery packs has received sufficient attention, especially the safety issues of battery packs, which has attracted sufficient attention from various related fields.

[0003] When the battery pack is working, due to the limitations of the cooling system structure design and the overall volume of the battery pack, there is insufficient heat exchange and untimely heat dissipation in the battery pack, resulting in a large temperature difference in the battery pack, thus affecting the performance and life of the battery pack and the power of the entire vehicle. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a battery pack that can solve the problems of uneven heat and untimely heat dissipation in the battery pack in the prior art.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] An embodiment of the present application provides a battery pack including a shell, a battery module and a thermally conductive structural adhesive; the shell has a accommodating space, and the battery module is arranged in the accommodating space; the battery module includes a plurality of battery cells, and the plurality of battery cells are arranged in an array along a first direction and a third direction, and the battery cell includes a main body, a positive electrode and a negative electrode, and the positive electrode and the negative electrode are arranged at both ends of the main body along a second direction; the thermally conductive structural adhesive is filled between the main body and the shell along the first direction, and is filled between two adjacent bodies along the second direction and the third direction.

[0007] In the embodiment of the present application, the thermally conductive structural adhesive is provided to evenly distribute heat among the multiple battery cells. Specifically, the thermally conductive structure is filled between two adjacent bodies along the second direction and the third direction. It can be understood that the thermally conductive structural adhesive is concentrated in the middle of the multiple battery cells, so that the multiple battery cells can be connected together through the thermally conductive structural adhesive. When a single battery cell generates heat, the heat will be transferred to the entire thermally conductive structural adhesive along with the local thermally conductive structural adhesive at the contact position with the body and transfer the heat outward, thereby achieving uniform heat distribution for the overall part of the multiple battery cells and improving the beneficial effect of improving the life of the battery cells.

[0008] Furthermore, the thermally conductive structural adhesive is filled between the main body and the outer shell along the first direction. It can be understood that the positive electrode and the negative electrode arranged at both ends of the main body along the second direction are not covered by the thermally conductive structural adhesive. When the battery cell fails and produces high-temperature and high-pressure gas, the high-temperature and high-pressure gas can be released from both ends of the main body along the first direction without affecting the adjacent battery cells and causing other battery cells to fail, which has the beneficial effect of protecting the non-failed battery cells.

[0009] Furthermore, the thermally conductive structural adhesive connects multiple battery cells to the outer casing as a whole. Under the condition of overall stability of the multiple battery cells, when the temperature of the battery module rises, it can be conducted to the outer casing through the thermally conductive structural adhesive, thereby realizing heat dissipation of the entire battery module, improving the battery life, customer experience and service life of the battery pack.

[0010] In actual applications, as shown in the figure, the gap between two adjacent battery cells is filled with thermally conductive structural adhesive, and the gap between the outermost battery cell and the outer shell among the multiple battery cells is also filled with thermally conductive structural adhesive. The setting of the thermally conductive structural adhesive connects the multiple battery cells into a whole while isolating the battery cells and the battery cells, and the battery cells and the shell from each other. On the one hand, the above setting improves the overall stability of the multiple battery cells. On the other hand, the thermally conductive structural adhesive is wrapped around the outer periphery of the body. When a single battery cell generates heat, it can be conducted outward through the thermally conductive structural adhesive to achieve uniform heat. It can also be conducted to the outer shell through the thermally conductive structural adhesive to achieve heat dissipation of the entire battery module. It has the beneficial effect of improving the uniformity of heat dissipation of the battery cells, preventing local overheating of multiple battery cells from causing excessive temperature differences, and reducing the life of the battery cells due to long-term use.

[0011] Optionally, in an embodiment of the present application, the outer shell includes a shell and a plurality of protrusions, the protrusions are fixedly connected to the shell, the protrusions extend along the third direction and pass through the accommodating space, the protrusions protrude from the shell toward the battery module, the battery module abuts against the protrusions along the second direction, the battery module, the protrusions and the shell together form an exhaust channel, and gas can flow in the exhaust channel along the third direction.

[0012] Optionally, in an embodiment of the present application, the battery module further includes two brackets, the two brackets are arranged relatively on both sides of the plurality of battery cells along the second direction, the brackets are provided with a plurality of through holes, the plurality of through holes are arranged in an array, the through holes are sleeved on the periphery of the body, the through holes correspond one-to-one to the battery cells and are connected to the exhaust channel, wherein the two brackets are clamped on both sides of the thermal conductive structural adhesive along the second direction.

[0013] Optionally, in an embodiment of the present application, the bracket includes a main body and an extension portion, the through hole is opened in the main body, the main body is connected to the plurality of battery cells along the second direction, and the extension portion is arranged around the outer periphery of the main body; the extension portion includes a first frame, a second frame and a third frame connected in sequence, the first frame and the third frame are arranged opposite to each other along the first direction, the second frame is arranged at one end of the main body close to the bottom of the outer shell, and the first frame, the second frame and the third frame wrap part of the plurality of battery cells; part of the thermal conductive structural adhesive is clamped between the extension portions of the two brackets along the second direction.

[0014] Optionally, in an embodiment of the present application, the battery module also includes a buffer, the buffer includes a first buffer portion and a second buffer portion, the first buffer portion covers a side of the extension portion facing away from the plurality of battery cells, and is clamped between the extension portion and the shell, and the second buffer portion is clamped between the main body and the raised portion; the second buffer portion covers an edge where the main body is connected to the first frame and an edge where the main body is connected to the third frame, the second buffer portion is clamped between the raised portion and the main body, and a projection of the second buffer portion along the second direction overlaps with a projection of the thermal conductive structural adhesive along the second direction.

[0015] Optionally, in an embodiment of the present application, the battery pack also includes a main board, which is crimped to the plurality of battery cells and the thermal conductive structural adhesive along a third direction, and the bracket is sleeved on the periphery of the main board, protrudes from the main board along the third direction and is connected to the main board.

[0016] Optionally, in an embodiment of the present application, the battery pack further includes an upper cover, the upper cover is adapted to the shell, the upper cover is arranged on a side of the main board facing away from the battery module, the upper cover, the main board and the shell together form a flow channel, and the flow channel is connected to the exhaust channel.

[0017] Optionally, in an embodiment of the present application, the upper cover is provided with a connecting hole, which connects the accommodating space and the outside of the battery pack. The battery pack also includes an explosion-proof valve, which is installed in the connecting hole. Gas can flow through the exhaust channel and the flow channel and then flow to the explosion-proof valve.

[0018] Optionally, in an embodiment of the present application, the battery module further includes a plurality of gaskets, which are disposed at both ends of the battery core, and are sleeved around the periphery of the positive electrode or the negative electrode, and the plurality of gaskets are abutted against the bracket.

[0019] Optionally, in an embodiment of the present application, the battery pack also includes a bottom plate, which is arranged opposite to the main board along the third direction, and is arranged on a side of the battery module close to the shell. The bottom plate is connected to the bracket and abuts against the thermal conductive structural adhesive, and the projection of the bottom plate along the third direction overlaps with the projection of the battery module along the third direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the structure of a battery pack in an embodiment of the present application;

[0021] Figure 2 It is a partial structural exploded schematic diagram of a battery pack in an embodiment of the present application;

[0022] Figure 3 is a schematic cross-sectional view of a battery pack in an embodiment of the present application;

[0023] Figure 4 is a schematic cross-sectional view of the battery pack in another direction in an embodiment of the present application;

[0024] Figure 5 It is a schematic diagram of the exploded structure of some components in the battery pack in the embodiment of the present application;

[0025] Figure 6 It is a schematic diagram of the structure of the battery module and the buffer member in the embodiment of the present application;

[0026] Figure 7 It is a schematic diagram of the exploded structure of the battery cell module in the embodiment of the present application.

[0027] Description of reference numerals:

[0028] 10. Shell; 11. Shell; 12. Raised portion; 13. Exhaust channel; 14. Bracket; 141. Through hole; 142. Main body; 143. Extended portion; 1431. First frame; 1432. Second frame; 1433. Third frame; 20. Battery module; 21. Battery cell; 211. Main body; 212. Positive electrode; 213. Negative electrode; 22. Buffer; 221. First buffer portion; 222. Second buffer portion; 30. Thermal conductive structural adhesive; 40. Main board; 50. Upper cover; 51. Explosion-proof valve; 52. Flow channel; 60. Gasket; 70. Bottom plate; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0031] The battery pack provided in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0032] See also Figures 1 to 7 The embodiment of the present application provides a battery pack, including a shell 10, a battery module 20 and a thermally conductive structural adhesive 30; the shell 10 has a containing space, and the battery module 20 is arranged in the containing space; the battery module 20 includes a plurality of battery cells 21, and the plurality of battery cells 21 are arranged in an array along a first direction X and a third direction Z, and the battery cell 21 includes a body 211, a positive electrode 212 and a negative electrode 213, and the positive electrode 212 and the negative electrode 213 are arranged at both ends of the body 211 along a second direction Y; the thermally conductive structural adhesive 30 is filled between the body 211 and the shell 10 along the first direction X, and is filled between two adjacent bodies 211 along the second direction Y and the third direction Z.

[0033] In the embodiment of the present application, the height of the battery pack is arranged along the third direction Z, and the width and thickness of the battery pack are arranged along the first direction X and the second direction Y, respectively, wherein the first direction X, the second direction Y and the third direction Z may intersect in pairs. Figure 1 , Figure 3 and Figure 4 As shown, the first direction X, the second direction Y and the third direction can also intersect each other and be perpendicular to each other. The setting of the thermal conductive structure adhesive 30 is used to evenly distribute the heat between the multiple battery cells 21. Specifically, the thermal conductive structure is filled between two adjacent bodies 211 along the second direction Y and the third direction Z. It can be understood that the thermal conductive structure adhesive 30 is concentrated in the middle of the multiple battery cells 21, so that the multiple battery cells 21 can be connected together through the thermal conductive structure adhesive 30. When a single battery cell 21 generates heat, the heat will be transferred to the entire thermal conductive structure adhesive 30 along with the local thermal conductive structure adhesive 30 at the contact position with the body 211 and the heat will be transferred outward, thereby achieving uniform heat distribution of the entire part of the multiple battery cells 21 and improving the life of the battery cells 21.

[0034] Furthermore, the thermally conductive structural adhesive 30 is filled between the main body 211 and the outer shell 10 along the first direction X. It can be understood that the positive electrode 212 and the negative electrode 213 arranged at both ends of the main body 211 along the second direction Y are not covered by the thermally conductive structural adhesive 30. When the battery cell 21 fails and generates high-temperature and high-pressure gas, the high-temperature and high-pressure gas can be released from both ends of the main body 211 along the first direction X without affecting the adjacent battery cells 21 and causing the other battery cells 21 to fail, which has the beneficial effect of protecting the non-failed battery cells 21.

[0035] Furthermore, the thermally conductive structural adhesive 30 connects the multiple battery cells 21 to the outer shell 10 as a whole. When the temperature of the multiple battery cells 21 is stable as a whole, when the temperature of the battery module 20 rises, it can be conducted to the outer shell 10 through the thermally conductive structural adhesive 30, thereby achieving heat dissipation of the entire battery module 20, thereby improving the battery life, customer experience and service life of the battery pack.

[0036] In practical applications, such as Figure 5 As described, the gap between two adjacent battery cells 21 is filled with the thermally conductive structural adhesive 30, and the gap between the outermost battery cell 21 and the outer shell 10 among the multiple battery cells 21 is also filled with the thermally conductive structural adhesive 30. The setting of the thermally conductive structural adhesive 30 connects the multiple battery cells 21 into a whole, and also isolates the battery cells 21 and the battery cells 21, and the battery cells 21 and the shell 11 from each other. On the one hand, the above setting improves the overall stability of the multiple battery cells 21. On the other hand, the thermally conductive structural adhesive 30 is wrapped around the outer periphery of the body 211. When a single battery cell 21 generates heat, it can be conducted outwardly through the thermally conductive structural adhesive 30 to achieve uniform heat, and can also be conducted to the outer shell 10 through the thermally conductive structural adhesive 30 to achieve heat dissipation of the entire battery module 20, which has the beneficial effects of improving the heat dissipation uniformity of the battery cell 21, preventing the local overheating of the multiple battery cells 21 from causing excessive temperature differences, and reducing the life of the battery cell 21 due to long-term use. It should be noted that the thermal conductive structural adhesive 30 is only wrapped around the outer periphery of the body 211 , and the positive electrode 212 and the negative electrode 213 of the battery cell 21 will not be covered by the thermal conductive structural adhesive 30 , and thus the thermal conductive structural adhesive 30 will not affect the normal use of the battery cell 21 .

[0037] Optionally, in an embodiment of the present application, the shell 10 includes a shell 11 and a protrusion 12, the protrusion 12 is fixedly connected to the shell 11, the protrusion 12 extends along a third direction Z and passes through the accommodating space, the protrusion 12 protrudes from the shell 11 toward the battery module 20, the battery module 20 abuts against the protrusion 12 along a second direction Y, the battery module 20, the protrusion 12 and the shell 11 enclose an exhaust channel 13, and the gas can flow along the third direction Z in the exhaust channel 13.

[0038] In the embodiment of the present application, the shell 11 is enclosed to form a cavity, and the protrusion 12 arranged inside the shell 11 is used to cooperate with the battery module 20 to form an exhaust channel 13 to achieve directional flow of high-temperature and high-pressure gas generated by the failure of the battery cell 21. Specifically, the length of the protrusion 12 along the third direction Z runs through the accommodating space, and the protrusion 12 protrudes from the shell 11 toward the battery module 20. In actual application, the battery module 20 abuts against the protrusion 12 along the second direction Y, and the protrusion 12 protrudes from the shell 11, that is, the battery module 20 has a certain interval with the inner wall of the shell 11 along the second direction Y. Further, the battery module 20, the protrusion 12 and the shell 11 enclose the exhaust channel 13. When the battery cell 21 fails and generates high-temperature and high-pressure gas, it can flow in the exhaust channel 13 along the third direction Z, which has the beneficial effect of releasing the high-temperature and high-pressure gas in the battery pack and preventing the battery pack from catching fire.

[0039] It should be noted that the shell 11 can be a square shell 11 or a circular shell 11, and this embodiment does not impose any limitation on this. The protruding direction of the protruding portion 12 is toward the axial direction of the shell 11 and abuts against the battery module 20.

[0040] Optionally, in an embodiment of the present application, the battery module 20 further includes two brackets 14, which are relatively arranged on both sides of the multiple battery cells 21 along the second direction Y, and the brackets 14 are provided with a plurality of through holes 141, and the plurality of through holes 141 are arranged in an array, and the through holes 141 are sleeved on the periphery of the main body 211, and the through holes 141 and the battery cells 21 correspond one-to-one and are connected to the exhaust channel 13, wherein the two brackets 14 are clamped on both sides of the thermal conductive structural adhesive 30 along the second direction Y.

[0041] In the embodiment of the present application, the bracket 14 is provided to provide support for the multiple battery cells 21, and at the same time, the bracket 14 is also provided to limit the heat conductive structural adhesive 30. The bracket 14 is provided with multiple through holes 141, and the through holes 141 are sleeved on the periphery of the end of the body 211. The through holes 141 are provided corresponding to the positive electrode 212 and the negative electrode 213. When the battery cell 21 fails and releases high-temperature and high-pressure gas, the gas flows out to the exhaust channel 13 along the through holes 141 connected to the exhaust channel 13. Timely removal of the high-temperature and high-pressure gas has the beneficial effect of preventing the battery pack from catching fire.

[0042] Furthermore, the two brackets 14 are clamped on both sides of the thermally conductive structural adhesive 30 along the second direction Y to limit the thermally conductive structural adhesive 30, effectively avoiding covering the positive electrode 212 and the negative electrode 213, while also improving the heat uniformity and heat dissipation of multiple battery cells 21, thereby avoiding the beneficial effect of battery pack fire.

[0043] Furthermore, the thermally conductive structural adhesive 30, the bracket 14 and the shell 11 effectively fix the multiple battery cells 21, which has the beneficial effect of preventing the bus from breaking due to the shaking of the battery cells 21 and the friction between the battery cells 21 when the battery pack encounters harsh working conditions.

[0044] Furthermore, the multiple battery cells 21 are connected to the bracket 14 and the housing 10 through the thermal conductive structural adhesive 30, which has the beneficial effect of preventing the battery cells 21 from shaking and causing the nickel sheets of the positive electrode 212 or the negative electrode 213 of the battery cells 21 to break and cause battery failure.

[0045] Optionally, in an embodiment of the present application, the bracket 14 includes a main body 142 and an extension portion 143, the through hole 141 is opened in the main body 142, the main body 142 is connected to the multiple battery cells 21 along the second direction Y, and the extension portion 143 is arranged around the outer periphery of the main body 142; the extension portion 143 includes a first frame 1431, a second frame 1432 and a third frame 1433 connected in sequence, the first frame 1431 and the third frame 1433 are arranged opposite to each other along the first direction X, the second frame 1432 is arranged at one end of the main body 142 close to the bottom of the outer shell 10, and the first frame 1431, the second frame 1432 and the third frame 1433 wrap part of the multiple battery cells 21; part of the thermal conductive structural adhesive 30 is clamped in the extension portion 143 of the two brackets 14 along the second direction Y.

[0046] In the embodiment of the present application, the main body 142 is connected to the battery cell 21 along the second direction Y, and the main bodies 142 of the two brackets 14 are clamped on both sides of the thermal conductive structural adhesive 30 and the multiple battery cells 21 along the second direction Y, so as to achieve the limiting effect on the thermal conductive structural adhesive 30 and the multiple battery cells 21. The through hole 141 is opened in the main body 142, and the positive electrode 212 and the negative electrode 213 of the battery cell 21 are both arranged corresponding to the through hole 141. The extension part 143 is arranged to limit the multiple battery cells 21 and the thermal conductive structural adhesive 30 from the first direction X, and has a first frame 1431 and a second frame 1432 arranged relatively along the first direction X and clamped on both sides of the multiple battery cells 21 and the thermal conductive structural adhesive 30, and the second frame 1432 is arranged at one end of the main body 142 close to the bottom of the housing 10. It can be understood that the extension part 143 uses a "U"-shaped structure to limit and fix the multiple battery cells 21 from the side of the main body 142.

[0047] Furthermore, since there are two brackets 14 , the first frames 1431 on the two brackets 14 have a preset interval along the first direction X, and part of the thermal conductive structural adhesive 30 is disposed in the preset interval to improve the thermal uniformity of the battery module 20 .

[0048] Optionally, in an embodiment of the present application, the battery module 20 also includes a buffer member 22, the buffer member 22 includes a first buffer portion 221 and a second buffer portion 222, the first buffer portion 221 covers a side of the extension portion 143 away from the multiple battery cells 21, and is clamped between the extension portion 143 and the shell 11, and the second buffer portion 222 is clamped between the main body 142 and the protrusion 12; the second buffer portion 222 covers the edge where the main body 142 is connected to the first frame 1431 and the edge where the main body 142 is connected to the third frame 1433, the second buffer portion 222 is clamped between the protrusion 12 and the main body 142, and the projection of the second buffer portion 222 along the second direction Y overlaps with the projection of the thermal conductive structural adhesive 30 along the second direction Y.

[0049] In the embodiment of the present application, the buffer 22 is provided to protect the battery cell 21 from strong impact under harsh working conditions. The first buffer 22 covers the side of the extension 143 away from the multiple battery cells 21, and the first buffer 221 is sandwiched between the extension 143 and the shell 11. In the event of a collision, the shell 11 is subjected to a collision load along the second direction Y. In the path where the collision load is transmitted to the multiple battery cells 21, the first buffer 22 absorbs at least part of the collision load, which has the beneficial effect of protecting the battery cell 21. The second buffer 222 covers the edge where the main body 142 is connected to the first frame 1431 and the edge where the main body 142 is connected to the third frame 1433, and the second buffer 222 is sandwiched between the protrusion 12 and the main body 142. In the event of a collision, the shell 11 is subjected to a collision load along the first direction X. In the path where the collision load is transmitted to the multiple battery cells 21, the second buffer 22 absorbs at least part of the collision load, which has the beneficial effect of protecting the battery cell 21.

[0050] It should be noted that the projection of the second buffer portion 222 along the second direction Y overlaps with the projection of the thermal conductive structural adhesive 30 along the second direction Y. It can be understood that the setting of the second buffer portion 222 avoids the through hole 141, which has the beneficial effect of preventing the high-temperature and high-pressure gas generated by the battery cell 21 from flowing out.

[0051] It should be noted that the buffer member 22 may be foam or other high temperature resistant materials that can play a buffering role, and this embodiment does not impose any limitation on this.

[0052] Optionally, in an embodiment of the present application, the battery pack also includes a main board 40, which is crimped to multiple battery cells 21 and thermal conductive structural adhesive 30 along a third direction Z, and the bracket 14 is sleeved on the periphery of the main board 40, and protrudes from the main board 40 along the third direction Z and is connected to the main board 40.

[0053] In the embodiment of the present application, the mainboard 40 is crimped to the multiple battery cells 21 and the thermal conductive structural adhesive 30 along the third direction Z, and the bracket 14 is sleeved on the periphery of the mainboard 40. It can be understood that the surface of the mainboard 40 is not covered by the thermal conductive structural adhesive 30. When the mainboard 40 is damaged and needs to be replaced, the mainboard 40 can be replaced without damaging the thermal conductive structural adhesive 30, which has the beneficial effect of facilitating repair and replacement.

[0054] Optionally, in an embodiment of the present application, the battery pack also includes an upper cover 50, which is adapted to the shell 11, and the upper cover 50 is arranged on a side of the main board 40 facing away from the battery module 20. The upper cover 50, the main board 40 and the shell 11 enclose a flow channel 52, and the flow channel 52 is connected to the exhaust channel 13.

[0055] In the embodiment of the present application, the upper cover 50 is provided to achieve sealing of the battery module 20, the upper cover 50 is adapted to the housing 11, and the upper cover 50 is provided on the side of the main board 40 away from the battery module 20. Further, there is a preset interval between the main board 40 and the upper cover 50, and the upper cover 50, the main board 40 and the housing 11 enclose a flow channel 52, and the flow channel 52 is connected to the exhaust channel 13, and the high-temperature and high-pressure gas generated by the failure of the battery cell 21 can flow between the flow channel 52 and the exhaust channel 13 to avoid the concentration of gas in a certain area in the battery pack and cause the battery pack to catch fire.

[0056] Optionally, in an embodiment of the present application, the upper cover 50 is provided with a connecting hole, which connects the accommodating space and the outside of the battery pack. The battery pack also includes an explosion-proof valve 51, which is installed in the connecting hole. The gas can flow through the exhaust channel 13 and the channel 52 and then flow to the explosion-proof valve 51.

[0057] In the embodiment of the present application, the connection hole is used to connect the accommodation space and the outside of the battery pack, and the explosion-proof valve 51 is installed in the connection hole. In practical applications, the high-temperature and high-pressure gas generated by the failure of the battery cell 21 can flow through the exhaust channel 13 and the channel 52 in sequence and then flow to the connection hole. When the gas pressure is greater than the preset pressure threshold of the explosion-proof valve 51, the gas breaks through the explosion-proof valve 51 and flows to the outside of the battery pack, which has the beneficial effect of avoiding the battery pack fire caused by the gas concentrated in the battery pack.

[0058] Optionally, in the embodiment of the present application, the battery module 20 further includes a plurality of gaskets 60 , which are disposed at both ends of the battery cell 21 , and are sleeved around the outer periphery of the positive electrode 212 or the negative electrode 213 , and the plurality of gaskets 60 abut against the bracket 14 .

[0059] In the embodiment of the present application, the gasket 60 is arranged at both ends of the battery cell 21 and is sleeved on the periphery of the positive electrode 212 or the negative electrode 213, and is abutted against the bracket 14. The setting of the gasket 60 has the beneficial effect of preventing the flowing thermal conductive structural adhesive 30 from overflowing into the exhaust channel 13 when the thermal conductive structural adhesive 30 is injected into the middle part of the battery cell 21 of the battery module 20. At the same time, the setting of the gasket 60 also plays a role in buffering and protecting the ends of the battery cell 21.

[0060] Optionally, in an embodiment of the present application, the battery pack also includes a bottom plate 70, which is arranged opposite to the main board 40 along a third direction Z, and is arranged on a side of the battery module 20 close to the shell 11. The bottom plate 70 is connected to the bracket 14, and the projection of the bottom plate 70 along the third direction Z overlaps with the projection of the battery module 20 along the third direction Z.

[0061] In the embodiment of the present application, the bottom plate 70 is used to provide support for the battery module 20, the bottom plate 70 and the main board 40 are arranged relative to each other along the third direction Z, and the bracket 14 is respectively connected to the main board 40 and the bottom plate 70. Further, when the flowing thermal conductive structural adhesive 30 is injected into the battery pack, the thermal conductive structural adhesive 30 is limited on the bottom plate 70 along the third direction Z.

[0062] In actual applications, by providing brackets 14 on both sides of the multiple battery cells 21 and providing seals on the brackets 14, the thermally conductive structural adhesive 30 injected into the battery pack can be concentrated in the middle of the multiple battery cells 21, thereby avoiding the filling of the explosion-proof valve 51 by the thermally conductive structural adhesive 30, and avoiding the safety risks caused by the covering of the explosion-proof valve 51. Furthermore, by injecting the thermally conductive structural adhesive 30 to fill the outer shell 10, the multiple battery cells 21 and the outer shell 10 are combined into one. When a single battery cell 21 generates heat, it can be transferred outward through the thermally conductive structural adhesive 30 to achieve uniform heat; at the same time, it can also be transferred to the aluminum outer shell 10 through the thermally conductive structural adhesive 30 to achieve heat dissipation of the entire battery module 20. It should be noted that the exhaust channel 13 is formed inside the battery pack by blocking the thermally conductive structural adhesive 30 by the bracket 14 and the buffer 22. When the battery pack system is running, if a single or several battery cells 21 cause thermal runaway due to overcharging, mechanical collision, etc., the high-temperature and high-pressure gas generated by the thermally runaway battery cells 21 can be discharged to the outside of the battery pack through the specific exhaust channel 13 and the flow channel 52, so that when the battery cell 21 fails, the battery pack can discharge the flammable and high-temperature gas in time to avoid fire, which has the beneficial effect of improving the safety performance of the battery pack.

[0063] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0064] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A battery pack, characterized in that: It comprises a housing (10), a battery module (20) and a heat-conducting structural adhesive (30); The housing (10) has a storage space, and the battery module (20) is arranged in the storage space; The battery module (20) comprises a plurality of battery cells (21), the plurality of battery cells (21) are arranged in an array along a first direction (X) and a third direction (Z), the battery cell (21) comprises a body (211), a positive electrode (212) and a negative electrode (213), the positive electrode (212) and the negative electrode (213) are arranged at two ends of the body (211) along a second direction (Y); The thermal conductive structural adhesive (30) is filled between the body (211) and the shell (10) along the first direction (X), and is filled between two adjacent bodies (211) along the second direction (Y) and the third direction (Z).

2. The battery pack according to claim 1, characterized in that: The housing (10) comprises a shell (11) and a plurality of protrusions (12); the protrusions (12) are fixedly connected to the shell (11); the protrusions (12) extend along the third direction (Z) and penetrate the accommodating space; the protrusions (12) protrude from the shell (11) toward the battery module (20); the battery module (20) abuts against the protrusions (12) along the second direction (Y); the battery module (20), the protrusions (12) and the shell (11) enclose an exhaust channel (13); and gas can flow in the exhaust channel (13) along the third direction (Z).

3. The battery pack according to claim 2, characterized in that: The battery module (20) further comprises two brackets (14), the two brackets (14) being arranged on both sides of the plurality of battery cells (21) along the second direction (Y), the brackets (14) being provided with a plurality of through holes (141), the plurality of through holes (141) being arranged in an array, the through holes (141) being sleeved on the periphery of the body (211), the through holes (141) corresponding to the battery cells (21) one by one and being connected to the exhaust channel (13), wherein the two brackets (14) are clamped on both sides of the thermal conductive structural adhesive (30) along the second direction (Y).

4. The battery pack according to claim 3, characterized in that: The bracket (14) comprises a main body (142) and an extension portion (143); the through hole (141) is opened in the main body (142); the main body (142) is connected to a plurality of the battery cells (21) along the second direction (Y); and the extension portion (143) is arranged around the outer periphery of the main body (142); The extension portion (143) comprises a first frame (1431), a second frame (1432) and a third frame (1433) which are connected in sequence, the first frame (1431) and the third frame (1433) are arranged opposite to each other along the first direction (X), the second frame (1432) is arranged at one end of the main body (142) close to the bottom of the housing (10), and the first frame (1431), the second frame (1432) and the third frame (1433) wrap part of the plurality of battery cells (21); Part of the heat-conducting structural adhesive (30) is clamped on the extension parts (143) of the two brackets (14) along the second direction (Y).

5. The battery pack according to claim 4, characterized in that: The battery module (20) further comprises a buffer member (22), the buffer member (22) comprising a first buffer portion (221) and a second buffer portion (222), the first buffer portion (221) covering a side of the extension portion (143) away from the plurality of battery cells (21) and being sandwiched between the extension portion (143) and the shell (11), and the second buffer portion (222) being sandwiched between the main body (142) and the protruding portion (12); The second buffer portion (222) covers the edge where the main body (142) is connected to the first frame (1431) and the edge where the main body (142) is connected to the third frame (1433), and the second buffer portion (222) is sandwiched between the raised portion (12) and the main body (142), and the projection of the second buffer portion (222) along the second direction (Y) overlaps with the projection of the thermal conductive structural adhesive (30) along the second direction (Y).

6. The battery pack according to claim 3, characterized in that: The battery pack further comprises a main board (40), wherein the main board (40) is crimped to the plurality of battery cells (21) and the thermal conductive structural adhesive (30) along a third direction (Z), and the bracket (14) is sleeved on the periphery of the main board (40), protrudes from the main board (40) along the third direction (Z) and is connected to the main board (40).

7. The battery pack according to claim 6, characterized in that: The battery pack further comprises an upper cover (50), wherein the upper cover (50) is matched with the shell (11), and the upper cover (50) is arranged on a side of the main board (40) facing away from the battery module (20). The upper cover (50), the main board (40) and the shell (11) enclose a flow channel (52), and the flow channel (52) is connected to the exhaust channel (13).

8. The battery pack according to claim 7, characterized in that: The upper cover (50) is provided with a connection hole, the connection hole communicating the accommodating space and the outside of the battery pack. The battery pack further comprises an explosion-proof valve (51), the explosion-proof valve (51) being installed in the connection hole, and gas can flow through the exhaust channel (13) and the flow channel (52) and then flow to the explosion-proof valve (51).

9. The battery pack according to claim 8, characterized in that: The battery module (20) further comprises a plurality of gaskets (60), wherein the gaskets (60) are arranged at both ends of the battery core (21), the gaskets (60) are sleeved around the periphery of the positive electrode (212) or the negative electrode (213), and the plurality of gaskets (60) are in abutment with the bracket (14).

10. The battery pack according to claim 9, characterized in that: The battery pack further comprises a bottom plate (70), the bottom plate (70) being arranged opposite to the main board (40) along the third direction (Z), the bottom plate (70) being arranged on a side of the battery module (20) close to the shell (11), the bottom plate (70) being connected to the bracket (14) and abutting against the thermal conductive structural adhesive (30), and the projection of the bottom plate (70) along the third direction (Z) and the projection of the battery module (20) along the third direction (Z) overlapping.

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