Battery pack

Abstract

The application discloses a battery pack and belongs to the technical field of batteries. The battery pack comprises a shell, a battery module and a heat-conducting structural adhesive. The shell has a containing space, and the battery module is arranged in the containing 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, 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 the heat-conducting structural adhesive is filled between two adjacent bodies along the second direction and the third direction. The heat-conducting structural adhesive is concentrated in the middle part of the plurality of battery cells, so that the plurality of battery cells can be connected together through the heat-conducting structural adhesive. When a single battery cell generates heat, the heat is transmitted to the whole heat-conducting structural adhesive through the local heat-conducting structural adhesive in contact with the body and is transmitted outward, thereby realizing the uniform heat distribution of the whole part of the plurality of battery cells and improving the service life of the battery cells.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack. Background Technology

[0002] Currently, the new energy industry is developing rapidly. As the core of the development of industries such as electric vehicles, medical devices, and energy storage equipment, the performance of battery packs has received sufficient attention, especially the safety 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 size of the battery pack, there is insufficient heat exchange and untimely heat dissipation within the battery pack, resulting in a large temperature difference within the battery pack, which affects the performance and lifespan of the battery pack and the overall vehicle power performance. Summary of the Invention

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

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] This application provides a battery pack including a casing, a battery module, and a thermally conductive structural adhesive; the casing has an accommodating space, and the battery module is disposed within the accommodating space; the battery module includes multiple battery cells, which are arranged in an array along a first direction and a third direction, and each battery cell includes a body, a positive electrode, and a negative electrode, which are disposed at both ends of the body along a second direction; the thermally conductive structural adhesive is filled between the body and the casing along the first direction, and is also filled between two adjacent bodies along the second direction and the third direction.

[0007] In this embodiment, the thermally conductive structural adhesive is used to uniformly distribute heat between multiple battery cells. Specifically, the thermally conductive structure is filled between two adjacent bodies along the second and third directions. It can be understood that the thermally conductive structural adhesive is concentrated in the middle of multiple battery cells, so that multiple battery cells can be connected together through the thermally conductive structural adhesive. When a single battery cell heats up, 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 then transferred outward, thereby achieving uniform heat distribution to the entire part of multiple battery cells and improving the battery cell life.

[0008] Furthermore, the thermally conductive structural adhesive is filled between the body and the outer shell along the first direction. Understandably, the positive and negative electrodes located at both ends of the body along the second direction are not covered by the thermally conductive structural adhesive. When the battery cell fails and generates high-temperature and high-pressure gas, the high-temperature and high-pressure gas can be released from both ends of the body along the first direction without affecting adjacent battery cells and causing other battery cells to fail. This has the beneficial effect of protecting the unfailed battery cells.

[0009] Furthermore, the thermally conductive structural adhesive connects multiple battery cells to the outer casing. With the 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, realizing heat dissipation of the entire battery module, improving the battery pack's range, customer experience, and service life.

[0010] In practical applications, as shown in the figure, the gaps between two adjacent cells are filled with thermally conductive structural adhesive. The gaps between the outermost cell and the outer casing are also filled with thermally conductive structural adhesive. This adhesive connects the multiple cells into a single unit while simultaneously isolating the cells from each other and from the casing. This design improves the overall stability of the multiple cells. Furthermore, the thermally conductive structural adhesive, wrapped around the outer periphery of the module, allows for heat conduction outwards through the adhesive when a single cell heats up, achieving uniform heat distribution. It also conducts heat to the casing, thus dissipating heat from the entire battery module. This improves the uniformity of heat dissipation, prevents excessive temperature differences caused by localized overheating of multiple cells, and avoids reducing cell lifespan over long-term use.

[0011] Optionally, in an embodiment of this application, the outer casing includes a housing and a plurality of protrusions. The protrusions are fixedly connected to the housing and extend along the third direction and penetrate the receiving space. The protrusions protrude from the housing toward the battery module. The battery module abuts against the protrusions along the second direction. The battery module, the protrusions, and the housing enclose and form an exhaust channel, in which gas can flow along the third direction within the exhaust channel.

[0012] Optionally, in this embodiment of the application, the battery module further includes two brackets, which are disposed opposite to each other on both sides of the plurality of battery cells along the second direction. Each bracket has a plurality of through holes arranged in an array. The through holes are sleeved on the periphery of the body. Each through hole corresponds to a battery cell and communicates with the exhaust channel. The two brackets are sandwiched on both sides of the thermally conductive structural adhesive along the second direction.

[0013] Optionally, in this embodiment, the bracket includes a main body and an extension. The through hole is formed in the main body, and the main body is connected to a plurality of battery cells along the second direction. The extension is disposed around the outer periphery of the main body. The extension includes a first frame, a second frame, and a third frame connected in sequence. The first frame and the third frame are disposed opposite each other along the first direction. The second frame is disposed at one end of the main body near the bottom of the outer shell. The first frame, the second frame, and the third frame enclose a portion of the plurality of battery cells. A portion of the thermally conductive structural adhesive is sandwiched between the extensions of the two brackets along the second direction.

[0014] Optionally, in this embodiment, the battery module further includes a buffer, which includes a first buffer portion and a second buffer portion. The first buffer portion covers the side of the extension portion away from the plurality of battery cells and is sandwiched between the extension portion and the housing. The second buffer portion is sandwiched between the main body and the protrusion. The second buffer portion covers the edge where the main body connects to the first frame and the edge where the main body connects to the third frame. The second buffer portion is sandwiched between the protrusion and the main body. The projection of the second buffer portion along the second direction overlaps with the projection of the thermally conductive structural adhesive along the second direction.

[0015] Optionally, in this embodiment of the application, the battery pack further includes a motherboard, which is pressed onto a plurality of battery cells and thermally conductive structural adhesive along a third direction, and the bracket is sleeved around the motherboard and protrudes from the motherboard along the third direction and is connected to the motherboard.

[0016] Optionally, in this embodiment of the application, the battery pack further includes a top cover, which is adapted to the housing. The top cover is disposed on the side of the motherboard opposite to the battery module. The top cover, the motherboard, and the housing together form a flow channel, which is connected to the exhaust channel.

[0017] Optionally, in this embodiment, the top cover has a connection hole that connects the accommodating space and the outside of the battery pack. The battery pack also includes an explosion-proof valve that is installed in the connection hole, allowing gas to flow through the exhaust channel and then through the channel to the explosion-proof valve.

[0018] Optionally, in this embodiment of the application, the battery module further includes a plurality of gaskets, the gaskets being disposed at both ends of the battery cell, the gaskets being sleeved around the positive electrode or the negative electrode, and the plurality of gaskets abutting against the bracket.

[0019] Optionally, in this embodiment of the application, the battery pack further includes a base plate, which is disposed opposite to the main board along the third direction. The base plate is disposed on the side of the battery module near the housing. The base plate is connected to the bracket and abuts against the thermally conductive structural adhesive. The projection of the base plate along the third direction overlaps with the projection of the battery module along the third direction. Attached Figure Description

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

[0021] Figure 2 This is an exploded view of part of the battery pack structure in an embodiment of this application;

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

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

[0024] Figure 5 This is an exploded structural diagram of some components in the battery pack in the embodiments of this application;

[0025] Figure 6 This is a schematic diagram of the battery module and buffer component in the embodiments of this application;

[0026] Figure 7 This is an exploded structural diagram of the battery cell module in an embodiment of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 10. Outer shell; 11. Housing; 12. Protrusion; 13. Exhaust channel; 14. Bracket; 141. Through hole; 142. Main body; 143. Extension; 1431. First frame; 1432. Second frame; 1433. Third frame; 20. Battery module; 21. Cell; 211. Body; 212. Positive electrode; 213. Negative electrode; 22. Buffer; 221. First buffer; 222. Second buffer; 30. Thermally conductive adhesive; 40. Main board; 50. Top cover; 51. Explosion-proof valve; 52. Flow channel; 60. Gasket; 70. Base plate; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0031] The battery pack provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0032] See Figures 1 to 7 This application provides a battery pack including a housing 10, a battery module 20, and a thermally conductive structural adhesive 30. The housing 10 has an accommodating space, and the battery module 20 is disposed within the accommodating space. The battery module 20 includes a plurality of battery cells 21, which are arranged in an array along a first direction X and a third direction Z. Each battery cell 21 includes a body 211, a positive electrode 212, and a negative electrode 213. The positive electrode 212 and the negative electrode 213 are disposed 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 housing 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 this embodiment, the height of the battery pack is set along a third direction Z, and the width and thickness of the battery pack are set along a first direction X and a second direction Y, respectively, wherein the first direction X, the second direction Y, and the third direction Z can intersect each other. 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 thermally conductive structural adhesive 30 is used to uniformly distribute heat between multiple battery cells 21. Specifically, the thermally 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 thermally conductive structural adhesive 30 is concentrated in the middle of multiple battery cells 21, so that multiple battery cells 21 can be connected together through the thermally conductive structural adhesive 30. When a single battery cell 21 heats up, the heat will be transferred to the entire thermally conductive structural adhesive 30 and then transferred outward along the local thermally conductive structural adhesive 30 at the contact position with the body 211, thereby achieving the beneficial effect of uniform heat distribution to the entire part of multiple battery cells 21 and improving the life of battery cells 21.

[0034] Furthermore, the thermally conductive structural adhesive 30 is filled between the body 211 and the outer shell 10 along the first direction X. It is understood that the positive electrode 212 and negative electrode 213 disposed at both ends of the 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 body 211 along the first direction X without affecting the adjacent battery cells 21 and causing other battery cells 21 to fail. This has the beneficial effect of protecting the unfailed battery cells 21.

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

[0036] In practical applications, such as Figure 5 The gaps between adjacent cells 21 are filled with thermally conductive structural adhesive 30. The gaps between the outermost cell 21 and the outer casing 10 are also filled with thermally conductive structural adhesive 30. This arrangement connects the multiple cells 21 into a single unit while simultaneously isolating the cells 21 from each other and from the casing 11. This configuration improves the overall stability of the multiple cells 21. Furthermore, the thermally conductive structural adhesive 30, wrapped around the outer periphery of the main body 211, allows for heat conduction outwards through the adhesive when a single cell 21 heats up, achieving uniform heat distribution. It also conducts heat to the casing 10, thus dissipating heat from the entire battery module 20. This improves the uniformity of heat dissipation for the cells 21, preventing excessive temperature differences caused by localized overheating of multiple cells 21, and mitigating the reduced lifespan of the cells 21 over long-term use. It should be noted that the thermally conductive structural adhesive 30 only wraps around the outer periphery of the body 211. The positive electrode 212 and negative electrode 213 of the battery cell 21 are not covered by the thermally conductive structural adhesive 30, and therefore the thermally conductive structural adhesive 30 will not affect the normal use of the battery cell 21.

[0037] Optionally, in this embodiment, the outer casing 10 includes a housing 11 and a protrusion 12. The protrusion 12 is fixedly connected to the housing 11. The protrusion 12 extends along a third direction Z and penetrates the receiving space. The protrusion 12 protrudes from the housing 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 housing 11 enclose and form an exhaust channel 13, in which gas can flow along a third direction Z within the exhaust channel 13.

[0038] In this embodiment, the housing 11 encloses a cavity. A protrusion 12 inside the housing 11 cooperates with the battery module 20 to form an exhaust channel 13, enabling the directional flow of high-temperature, high-pressure gas generated by the failure of the battery cell 21. Specifically, the protrusion 12 extends through the accommodating space along the third direction Z, and protrudes from the housing 11 towards the battery module 20. In practical applications, the battery module 20 abuts against the protrusion 12 along the second direction Y, and the protrusion 12 protrudes from the housing 11. That is, the battery module 20 has a certain distance from the inner wall of the housing 11 along the second direction Y. Furthermore, the battery module 20, the protrusion 12, and the housing 11 enclose the exhaust channel 13. When the battery cell 21 fails and generates high-temperature, high-pressure gas, it can flow along the third direction Z within the exhaust channel 13, effectively releasing the high-temperature, high-pressure gas within the battery pack and preventing the battery pack from catching fire.

[0039] It should be noted that the housing 11 can be a square housing 11 or a circular housing 11. This embodiment does not make any limitation on this. The protrusion of the protrusion 12 can be directed towards the axial direction of the housing 11 and abut against the battery module 20.

[0040] Optionally, in this embodiment of the application, the battery module 20 further includes two brackets 14, which are disposed opposite to each other on both sides of the plurality of battery cells 21 along the second direction Y. The brackets 14 have a plurality of through holes 141 arranged in an array. The through holes 141 are sleeved on the periphery of the body 211. The through holes 141 correspond one-to-one with the battery cells 21 and are connected to the exhaust channel 13. The two brackets 14 are sandwiched on both sides of the thermally conductive structural adhesive 30 along the second direction Y.

[0041] In this embodiment, the bracket 14 is provided to support multiple battery cells 21, and also to limit the thermally conductive structural adhesive 30. The bracket 14 has multiple through holes 141, which are sleeved on the periphery of the end of the body 211. The through holes 141 correspond to the positive electrode 212 and the negative electrode 213. When a battery cell 21 fails and releases high-temperature and high-pressure gas, the gas flows out through the through holes 141 that are connected to the exhaust channel 13, thus timely removal of 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, which realizes the limitation of the thermally conductive structural adhesive 30, effectively avoiding the coverage of the positive electrode 212 and the negative electrode 213, while also improving the heat uniformity and heat dissipation of multiple cells 21, thus avoiding the beneficial effect of battery pack fire.

[0043] Furthermore, the thermally conductive structural adhesive 30, the bracket 14, and the housing 11 effectively fix the multiple battery cells 21, which has the beneficial effect of preventing busbar breakage and friction damage between battery cells 21 caused by shaking when the battery pack encounters harsh operating conditions.

[0044] Furthermore, multiple battery cells 21 are connected to the bracket 14 and the outer casing 10 through thermally conductive structural adhesive 30, which has the beneficial effect of preventing the nickel sheet of the positive electrode 212 or negative electrode 213 of the battery cell 21 from breaking due to shaking of the battery cell 21, thus preventing battery failure.

[0045] Optionally, in this embodiment, the bracket 14 includes a main body 142 and an extension 143. A through hole 141 is formed in the main body 142. The main body 142 is connected to a plurality of battery cells 21 along the second direction Y. The extension 143 is disposed around the outer periphery of the main body 142. The extension 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 disposed opposite each other along the first direction X. The second frame 1432 is disposed at one end of the main body 142 near the bottom of the outer shell 10. The first frame 1431, the second frame 1432 and the third frame 1433 enclose a portion of the plurality of battery cells 21. A portion of the thermally conductive structural adhesive 30 is clamped in the extension 143 of the two brackets 14 along the second direction Y.

[0046] In this embodiment, the main body 142 is connected to the battery cell 21 along the second direction Y. The main body 142 of the two supports 14 is sandwiched between the thermally conductive structural adhesive 30 and the multiple battery cells 21 along the second direction Y, thereby limiting the thermally conductive structural adhesive 30 and the multiple battery cells 21. A through hole 141 is formed in the main body 142, and the positive electrode 212 and negative electrode 213 of the battery cell 21 are respectively disposed with respect to the through hole 141. The extension 143 is provided to limit the multiple battery cells 21 and the thermally conductive structural adhesive 30 from the first direction X. It has a first frame 1431 and a second frame 1432 disposed opposite to each other along the first direction X and sandwiched between the multiple battery cells 21 and the thermally conductive structural adhesive 30. The second frame 1432 is disposed at one end of the main body 142 near the bottom of the outer shell 10. It can be understood that the extension 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 supports 14, the first frame 1431 on the two supports 14 has a preset interval along the first direction X, and part of the thermally conductive structural adhesive 30 is disposed within the preset interval to improve the heat uniformity of the battery module 20.

[0048] Optionally, in this embodiment, the battery module 20 further includes a buffer 22, which includes a first buffer portion 221 and a second buffer portion 222. The first buffer portion 221 covers the side of the extension 143 opposite to the plurality of battery cells 21 and is sandwiched between the extension 143 and the housing 11. The second buffer portion 222 is sandwiched between the main body 142 and the protrusion 12. The second buffer portion 222 covers the edge where the main body 142 connects to the first frame 1431 and the edge where the main body 142 connects to the third frame 1433. The second buffer portion 222 is sandwiched between the protrusion 12 and the main body 142. The projection of the second buffer portion 222 along the second direction Y overlaps with the projection of the thermally conductive structural adhesive 30 along the second direction Y.

[0049] In this embodiment, the buffer 22 is provided to protect the battery cells 21 from strong impacts under harsh operating conditions. A first buffer portion 221 covers the side of the extension 143 facing away from the multiple battery cells 21 and is sandwiched between the extension 143 and the housing 11. In the event of a collision, the housing 11 is subjected to a collision load along the second direction Y. In the path of the collision load transmission to the multiple battery cells 21, the first buffer portion 221 absorbs at least a portion of the collision load, thus protecting the battery cells 21. A second buffer portion 222 covers the edge connecting the main body 142 and the first frame 1431, as well as the edge connecting the main body 142 and the third frame 1433. The second buffer portion 222 is sandwiched between the protrusion 12 and the main body 142. In the event of a collision, the housing 11 is subjected to a collision load along the first direction X. In the path of the collision load transmission to the multiple battery cells 21, the second buffer portion 22 absorbs at least a portion of the collision load, thus protecting the battery cells 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 thermally conductive structural adhesive 30 along the second direction Y. It can be understood that the arrangement 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 22 can be foam or other high-temperature resistant materials that can provide cushioning. This embodiment does not impose any limitations on this.

[0052] Optionally, in this embodiment of the application, the battery pack further includes a motherboard 40, which is pressed onto a plurality of battery cells 21 and thermally conductive structural adhesive 30 along the third direction Z. A bracket 14 is sleeved around the motherboard 40 and protrudes from the motherboard 40 along the third direction Z and is connected to the motherboard 40.

[0053] In this embodiment, the motherboard 40 is pressed onto multiple battery cells 21 and thermally conductive structural adhesive 30 along the third direction Z, and the bracket 14 is sleeved around the motherboard 40. It is understood that the surface of the motherboard 40 is not covered by the thermally conductive structural adhesive 30. When the motherboard 40 is damaged and needs to be replaced, it can be replaced without damaging the thermally conductive structural adhesive 30, which has the beneficial effect of facilitating repair and replacement.

[0054] Optionally, in this embodiment of the application, the battery pack further includes an upper cover 50, which is adapted to the housing 11. The upper cover 50 is disposed on the side of the motherboard 40 opposite to the battery module 20. The upper cover 50, the motherboard 40 and the housing 11 enclose and form a flow channel 52, which is connected to the exhaust channel 13.

[0055] In this embodiment, the top cover 50 is used to seal the battery module 20. The top cover 50 is adapted to the housing 11 and is disposed on the side of the main board 40 opposite to the battery module 20. Furthermore, there is a preset gap between the main board 40 and the top cover 50. The top cover 50, the main board 40, and the housing 11 enclose a flow channel 52, which is connected to the exhaust channel 13. 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 gas from concentrating in a certain area of ​​the battery pack and causing a fire.

[0056] Optionally, in this embodiment, the top cover 50 has a connection hole that 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 connection hole. Gas can flow through the exhaust channel 13 and the channel 52 before flowing to the explosion-proof valve 51.

[0057] In this embodiment, the connection hole is provided to connect the accommodating 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 sequentially through the exhaust channel 13 and the channel 52 before flowing to the connection hole. When the gas pressure exceeds the preset pressure threshold of the explosion-proof valve 51, the gas will force open the explosion-proof valve 51 and flow to the outside of the battery pack, which has the beneficial effect of preventing the gas from accumulating inside the battery pack and causing a fire.

[0058] Optionally, in this embodiment of the 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 positive electrode 212 or the negative electrode 213. The plurality of gaskets 60 abut against the bracket 14.

[0059] In this embodiment, the gasket 60 is disposed at both ends of the cell 21 and sleeved around the positive electrode 212 or negative electrode 213, and abuts against the bracket 14. When the thermally conductive structural adhesive 30 is injected into the middle part of the cell 21 of the battery module 20, the gasket 60 has the beneficial effect of preventing the flowing thermally conductive structural adhesive 30 from overflowing into the exhaust channel 13. At the same time, the gasket 60 also serves to buffer and protect the end of the cell 21.

[0060] Optionally, in this embodiment of the application, the battery pack further includes a base plate 70, which is disposed opposite to the main board 40 along the third direction Z. The base plate 70 is disposed on the side of the battery module 20 near the housing 11. The base plate 70 is connected to the bracket 14, and the projection of the base plate 70 along the third direction Z overlaps with the projection of the battery module 20 along the third direction Z.

[0061] In this embodiment, the base plate 70 is provided to support the battery module 20. The base plate 70 and the main board 40 are disposed opposite each other along the third direction Z, and the bracket 14 is connected to the main board 40 and the base plate 70 respectively. Furthermore, when flowing thermally conductive structural adhesive 30 is injected into the battery pack, the thermally conductive structural adhesive 30 is confined above the base plate 70 along the third direction Z.

[0062] In practical applications, by setting brackets 14 on both sides of multiple battery cells 21 and setting 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, avoiding the filling of the explosion-proof valve 51 by the thermally conductive structural adhesive 30 and avoiding the safety risks caused by the explosion-proof valve 51 being covered. Furthermore, by filling the shell 10 with the thermally conductive structural adhesive 30, the multiple battery cells 21 and the shell 10 are combined into one unit. When a single battery cell 21 heats up, it can transfer heat outward through the thermally conductive structural adhesive 30 to achieve uniform heat distribution; at the same time, it can also transfer heat to the aluminum shell 10 through the thermally conductive structural adhesive 30, realizing heat dissipation of the entire battery module 20. It should be noted that by blocking the thermally conductive structural adhesive 30 through the brackets 14 and the buffer 22, an exhaust channel 13 is formed inside the battery pack. When the battery pack system is running, if one or more cells 21 experience thermal runaway due to overcharging, mechanical collision, or other reasons, the high-temperature and high-pressure gas generated by the thermally runaway cell 21 can be discharged outside the battery pack through a specific exhaust channel 13 and flow channel 52. This allows the battery pack to promptly discharge flammable and high-temperature gases when the cell 21 fails, preventing fires and improving the safety performance of the battery pack.

[0063] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0064] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A battery pack, characterized in that, Includes a housing (10), a battery module (20), and thermally conductive structural adhesive (30); The outer casing (10) has a receiving space, and the battery module (20) is disposed in the receiving space; the outer casing (10) includes a shell (11) and a plurality of protrusions (12); the battery module (20), the protrusions (12) and the shell (11) enclose to form an exhaust channel (13); the battery module (20) includes a plurality of cells (21), the plurality of cells (21) are arranged in an array along a first direction (X) and a third direction (Z), the cell (21) includes a body (211), a positive electrode (212) and a negative electrode (213), the positive electrode (212) and the negative electrode (213) are disposed at both ends of the body (211) along a second direction (Y); The battery module (20) further includes two brackets (14), which are arranged opposite each other along the second direction (Y) on both sides of the plurality of battery cells (21). Each bracket (14) has a plurality of through holes (141), which are arranged in an array. The through holes (141) are fitted around the body (211), and each through hole (141) corresponds one-to-one with the positive electrode (212) or negative electrode (213) of the battery cell (21) and is arranged in an array. The air channel (13) is connected, wherein two of the brackets (14) are sandwiched on both sides of the thermally conductive structural adhesive (30) along the second direction (Y); the bracket (14) includes a main body (142) and an extension (143); the thermally conductive structural adhesive (30) is filled between the main body (211) and the outer shell (10) along the first direction (X), and is filled between two adjacent main bodies (211) along the second direction (Y) and the third direction (Z); The battery module (20) further includes a buffer (22), which includes a first buffer portion (221) and a second buffer portion (222). The first buffer portion (221) covers the side of the extension (143) facing away from the plurality of battery cells (21) and is sandwiched between the extension (143) and the housing (11). The second buffer portion (222) is sandwiched between the main body (142) and the protrusion (12). The extension (143) includes a first frame (14... 31) and the third frame (1433), the second buffer (222) covers the edge where the main body (142) connects to the first frame (1431) and the edge where the main body (142) connects to the third frame (1433), the second buffer (222) is sandwiched between the protrusion (12) and the main body (142), and the projection of the second buffer (222) along the second direction (Y) overlaps with the projection of the thermally conductive structural adhesive (30) along the second direction (Y).

2. The battery pack according to claim 1, characterized in that, The protrusion (12) is fixedly connected to the housing (11). The protrusion (12) extends along the third direction (Z) and penetrates the receiving space. The protrusion (12) protrudes from the housing (11) toward the battery module (20). The battery module (20) abuts against the protrusion (12) along the second direction (Y). Gas can flow along the third direction (Z) in the exhaust channel (13).

3. The battery pack according to claim 1, characterized in that, The through hole (141) is formed in the body (142), the body (142) is connected to a plurality of the battery cells (21) along the second direction (Y), and the extension (143) is disposed around the outer periphery of the body (142); The extension (143) further includes a second frame (1432), the first frame (1431), the second frame (1432) and the third frame (1433) 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 disposed at one end of the main body (142) near the bottom of the outer shell (10), and the first frame (1431), the second frame (1432) and the third frame (1433) enclose a portion of the plurality of the battery cells (21); Part of the thermally conductive structural adhesive (30) is clamped along the second direction (Y) in the extension (143) of the two supports (14).

4. The battery pack according to claim 2, characterized in that, The battery pack also includes a motherboard (40), which is pressed onto a plurality of battery cells (21) and thermally conductive structural adhesive (30) along a third direction (Z). The bracket (14) is sleeved around the motherboard (40), protrudes from the motherboard (40) along the third direction (Z), and is connected to the motherboard (40).

5. The battery pack according to claim 4, characterized in that, The battery pack also includes a top cover (50), which is adapted to the housing (11). The top cover (50) is disposed on the side of the main board (40) opposite to the battery module (20). The top cover (50), the main board (40) and the housing (11) enclose a flow channel (52), which is connected to the exhaust channel (13).

6. The battery pack according to claim 5, characterized in that, The top cover (50) has a connection hole that connects the accommodating space and the outside of the battery pack. The battery pack also includes an explosion-proof valve (51) that is installed in the connection hole. Gas can flow through the exhaust channel (13) and the flow channel (52) and then flow to the explosion-proof valve (51).

7. The battery pack according to claim 6, characterized in that, The battery module (20) also includes multiple gaskets (60), which are disposed at both ends of the battery cell (21). The gaskets (60) are sleeved around the positive electrode (212) or the negative electrode (213), and the multiple gaskets (60) abut against the bracket (14).

8. The battery pack according to claim 7, characterized in that, The battery pack also includes a base plate (70), which is disposed opposite to the main board (40) along the third direction (Z). The base plate (70) is disposed on the side of the battery module (20) near the housing (11). The base plate (70) is connected to the bracket (14) and abuts against the thermally conductive structural adhesive (30). The projection of the base plate (70) along the third direction (Z) overlaps with the projection of the battery module (20) along the third direction (Z).

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