Battery pack and electric device with same

Abstract

The utility model discloses a battery pack and an electric device with the same, and relates to the technical field of batteries. The battery pack comprises a chassis, a bearing boss, a battery cell and a heat dissipation piece, the bearing boss is arranged on the chassis, and a first exhaust channel is arranged on the bearing boss; the battery cell is arranged on the chassis and is lapped on the bearing boss; the heat dissipation piece is arranged on the base plate and lapped on the bearing boss, the heat dissipation piece is in contact with the battery cell, a phase change material part is arranged in an inner cavity of the heat dissipation piece, and the inner cavity of the heat dissipation piece is communicated with the first exhaust channel. The battery pack disclosed by the utility model is provided with the directional exhaust channel, and gas generated by the heat dissipation piece is collected and treated in a centralized manner, so that the safety and the heat dissipation efficiency of the battery pack are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a battery pack and electric device with it. BACKGROUND

[0002] In the prior art, some battery packs use phase change heat-absorbing materials to absorb and manage heat, so as to improve the safety and performance of the battery. However, during the operation of the battery, the phase change material may generate gas during heat absorption. If these gases cannot be effectively discharged, they may re-enter the battery cell area, causing an increase in internal pressure and temperature, and even causing safety hazards.

[0003] Therefore, the battery pack has room for improvement. SUMMARY

[0004] The utility model discloses at least one of the technical problems existing in the prior art. To this end, the utility model discloses a battery pack, which has a directional exhaust passage to collect the gas generated by the heat dissipation member, thereby improving the heat dissipation efficiency and safety of the battery pack.

[0005] The utility model discloses a battery pack, which has a directional exhaust passage to collect the gas generated by the heat dissipation member, thereby improving the heat dissipation efficiency and safety of the battery pack.

[0006] The battery pack according to the first aspect of the utility model comprises a base plate, a bearing boss, a battery cell and a heat dissipation member. The bearing boss is arranged on the base plate, and a first exhaust passage is arranged on the bearing boss. The battery cell is arranged on the base plate and rests on the bearing boss. The heat dissipation member is arranged on the base plate and rests on the bearing boss. The heat dissipation member is in contact with the battery cell. A phase change material part is arranged in the inner cavity of the heat dissipation member. The inner cavity of the heat dissipation member is in gas communication with the first exhaust passage.

[0007] The battery pack according to the utility model embodiment collects the gas generated by the heat dissipation member through the first exhaust passage formed by the bearing boss, and concentrates the gas, thereby preventing the gas from re-entering the battery cell and improving the safety line and heat dissipation efficiency of the battery pack.

[0008] The battery pack according to some embodiments of the utility model has a first pressure relief hole arranged on the top of the bearing boss, and the first pressure relief hole is in communication with the first exhaust passage. The bottom of the heat dissipation member is provided with a first exhaust hole, and the first exhaust hole is arranged opposite to the first pressure relief hole.

[0009] In some optional embodiments, the heat dissipation member further comprises an air-permeable valve arranged at the first exhaust hole.

[0010] According to some optional embodiments of the present application, the heat dissipation member further comprises: a packaging shell, the inner cavity is arranged in the packaging shell, the phase change material part is arranged in the packaging shell, and the inner cavity further comprises a second exhaust passage arranged on at least one side of the phase change material part; a first exhaust hole connected with the second exhaust passage is arranged on the packaging shell, and the first exhaust hole is in air communication with the first exhaust passage.

[0011] In some specific embodiments, the heat dissipation member further comprises: a breathable packaging film, the breathable packaging film is arranged in the packaging shell and wrapped on the outer side surface of the phase change material part.

[0012] Optionally, the heat dissipation member further comprises: a support framework, the support framework is arranged in the packaging shell, and the phase change material part is arranged on the support framework and supported by the support framework.

[0013] In some optional embodiments, the heat dissipation member is arranged in the first direction, the second exhaust passage comprises: a bottom passage arranged below the phase change material part, the bottom passage is arranged in the first direction, and the first exhaust hole is in communication with the bottom passage; two side passages arranged at two ends of the heat dissipation member, and the lower ends of the two side passages are in communication with the bottom passage.

[0014] According to some optional embodiments of the present application, a plurality of the battery cells are arranged in a second direction, the heat dissipation member is at least one and is clamped between two adjacent battery cells; the bearing boss is arranged in the second direction, the battery cell is provided with a second exhaust hole, the second exhaust hole is in communication with the first exhaust passage, and the battery cell further comprises an explosion-proof valve arranged in the second exhaust hole.

[0015] Specifically, the bearing boss is at least two arranged in the first direction, each of the bearing bosses is provided with the first exhaust passage; each of the battery cells and each of the heat dissipation members is a heat-generating gas-producing member, a plurality of the heat-generating gas-producing members are arranged in the second direction, the heat-generating gas outlet of the heat dissipation member is the first exhaust hole, the heat-generating gas outlet of the battery cell is the second exhaust hole, and the heat-generating gas outlets of the plurality of heat-generating gas-producing members are alternately connected with the first exhaust passages on the at least two bearing bosses.

[0016] According to some optional embodiments, the bearing boss comprises: a bearing top plate, at least one of a first pressure relief hole and a second pressure relief hole is arranged on the bearing top plate, the first pressure relief hole is used for connecting the heat-generating gas outlet of the heat dissipation member, and the second pressure relief hole is used for connecting the heat-generating gas outlet of the battery cell; two bearing side plates are respectively connected to two sides of the bearing top plate, and the lower end of each of the bearing side plates is connected with the bottom disc.

[0017] In some optional embodiments, the bottom plate comprises a box bottom plate and a box side plate connected to the edge of the box bottom plate; the bearing boss is arranged on the box bottom plate; the battery pack further comprises a reinforcing plate, one end of the reinforcing plate being connected to the box side plate and the other end being connected to the bearing boss.

[0018] Optionally, the box bottom plate and the box side plate are integrally formed by stamping, and the reinforcing plate and the bearing boss are welded to the bottom plate.

[0019] According to some optional embodiments, a total discharge valve is arranged on the bottom plate, and the total discharge valve is located at least one end of the bearing boss.

[0020] Optionally, the bearing boss is in the shape of a rod extending in the second direction, and two ends of the bearing boss are provided with openings communicating with the first exhaust channel; the total discharge valve is arranged on the bottom plate, one end of the total discharge valve being located in the battery pack and being arranged towards the opening of the bearing boss; when the total discharge valve is arranged at only one end of the bearing boss, the other end of the opening is arranged in a blocked manner.

[0021] In some optional embodiments, the bottom plate comprises a box bottom plate and a box side plate, and the bearing boss is arranged on the box bottom plate; the battery pack further comprises at least one reinforcing plate, and the reinforcing plate is connected to the box side plate.

[0022] According to some optional embodiments of the utility model, the bottom plate comprises a box bottom plate and a box side plate, and the battery pack further comprises a bottom guard plate, and the bottom guard plate is arranged at the bottom of the box bottom plate.

[0023] Optionally, the battery pack further comprises at least one anti-expansion beam, and the anti-expansion beam is located at at least one end of the bottom plate in the second direction.

[0024] According to the power device of the second aspect of the utility model, the battery pack is according to the first aspect of the utility model.

[0025] The additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0027] Figure 1 is the structure diagram of the battery pack of some embodiments of the utility model;

[0028] Figure 2 is the arrangement diagram of the battery pack of some embodiments of the utility model.

[0029] Figure 3 is a position diagram of the electric core, the heat dissipation piece and the bearing boss of some embodiments of the utility model;

[0030] Figure 4 is an explosion view of the heat dissipation piece of some embodiments of the utility model;

[0031] Figure 5 is a sectional view of the heat dissipation piece of some embodiments of the utility model;

[0032] Figure 6 is a perspective view of the heat dissipation piece of some embodiments of the utility model;

[0033] Figure 7 is a perspective view of the electric core of some embodiments of the utility model;

[0034] Figure 8 is an explosion view of the battery pack of some embodiments of the utility model;

[0035] Figure 9 is a cooperation diagram of the heat dissipation piece and the bearing boss of some embodiments of the utility model;

[0036] Figure 10 is a cooperation diagram of the reinforcing plate and the bottom disc of some embodiments of the utility model;

[0037] Figure 11 is a position diagram of the reinforcing plate of some embodiments of the utility model;

[0038] Figure 12 is a cooperation diagram of the reinforcing plate and the bearing boss of some embodiments of the utility model;

[0039] Figure 13 is a position diagram of the total valve of some embodiments of the utility model;

[0040] Figure 14 is a position diagram of the anti-expansion beam of some embodiments of the utility model.

[0041] Reference signs:

[0042] Battery pack 100,

[0043] Bottom disc 10,

[0044] Box bottom plate 11, box side plate 13,

[0045] Bearing boss 20,

[0046] First exhaust passage 201, opening 202,

[0047] Bearing boss top plate 22, first pressure relief hole 221, second pressure relief hole 222,

[0048] the carrier side plate 24,

[0049] the battery cell 30, the battery cell group X,

[0050] the second exhaust hole 31, the explosion-proof valve 311,

[0051] the heat dissipation member 40,

[0052] the first exhaust hole 41, the air permeation valve 411, the packaging shell 42, the inner cavity 420, the air permeation packaging film 43, the support framework 44, the second exhaust passage 45, the bottom passage 451, the side passage 452, the phase change material,

[0053] the reinforcing plate 51, the total exhaust valve 52, the anti-expansion beam 53, the reinforcing plate 54, the bottom guard plate 55. DETAILED DESCRIPTION

[0054] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as a limitation of the present application.

[0055] In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the terms "longitudinal", "upper", "lower", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation to be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the features limited as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0056] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] The following will be described with reference to Figures 1-14 The battery pack 100 according to the first aspect of the present application is described.

[0058] As Figure 1As shown, the battery pack 100 comprises a chassis 10, a bearing boss 20, a battery cell 30 and a heat sink 40.

[0059] The chassis 10 is configured to provide a stable mounting platform.

[0060] The bearing boss 20, the battery cell 30 and the heat sink 40 are all arranged on the chassis 10.

[0061] The chassis 10 bears the weight from the battery cell 30 and other components.

[0062] In some optional embodiments, the chassis 10 is a high-strength material piece, such as an aluminum alloy piece, a steel piece, etc., to ensure sufficient mechanical strength and durability.

[0063] In combination Figure 1 The bearing boss 20 is arranged on the chassis 10, and the bearing boss 20 is provided with a first exhaust passage 201.

[0064] Here, the bearing boss 20 is arranged on the chassis 10.

[0065] Optionally, a part of the battery cell 30 is placed on the bearing boss 20, and another part of the battery cell 30 is placed on the chassis 10. In this way, the bearing boss 20 can bear part of the weight of the battery cell 30 and help to disperse the pressure exerted by the battery cell 30, preventing the chassis 10 from deforming.

[0066] Optionally, a part of the heat sink 40 is placed on the bearing boss 20, and another part of the heat sink 40 is placed on the chassis 10. In this way, the bearing boss 20 can bear part of the weight of the heat sink 40 and help to disperse the pressure exerted by the heat sink 40, preventing the chassis 10 from deforming.

[0067] Here, the bearing boss 20 is provided with the first exhaust passage 201. When the heat sink 40 generates high-temperature gas after absorbing heat, the first exhaust passage 201 is suitable for collecting the gas generated inside the heat sink 40 after the phase change material absorbs heat, achieving the effect of guiding the gas to a specific location.

[0068] In some optional embodiments, the heat sink 40 is directly or indirectly connected with the first exhaust passage 201. In some technical solutions, the inner cavity 420 of the heat sink 40 can be directly connected with the first exhaust passage 201, forming an air flow path to ensure smooth exhaust of the gas. In some other technical solutions, the heat sink 40 is connected with the first exhaust passage 201 through one or more intermediate transition pieces. The intermediate transition piece can be a pipeline, a joint, etc. By arranging the intermediate transition piece, the complex spatial layout inside the battery pack 100 can be adapted, and the flexibility of the layout is improved. At the same time, the intermediate transition piece can also play a certain buffering role, absorbing vibration, preventing connection loosening caused by mechanical stress, and improving the reliability of the system.

[0069] Optionally, the first exhaust passage 201 is in communication with the outside of the battery pack 100, or the first exhaust passage 201 is in communication with other passages in the battery pack 100. In this way, the high-temperature gas in the first exhaust passage 201 can be gathered and directed away from the battery cell 30, avoiding gas accumulation and ensuring the safe and stable operation of the battery cell 30.

[0070] In combination Figure 1 The battery cell 30 is arranged on the base plate 10 and on the bearing boss 20. The arrangement of the battery cell 30 can ensure that it is additionally supported, increase the contact area between the battery cell 30 and the mounting platform, and improve the stability and safety of the battery cell 30.

[0071] In combination Figure 1 The heat dissipation member 40 is arranged on the base plate 10 and on the bearing boss 20. The heat dissipation member 40 can obtain more additional support to improve the stability and safety of the heat dissipation member 40.

[0072] In combination Figures 1-3 The heat dissipation member 40 is in contact with the battery cell 30.

[0073] The contact between the heat dissipation member 40 and the battery cell 30 can ensure that heat is quickly conducted from the battery cell 30 to the heat dissipation member 40, improving the heat dissipation efficiency.

[0074] Optionally, the heat dissipation member 40 is in direct contact with the battery cell 30. This arrangement can minimize thermal resistance and improve heat conduction efficiency.

[0075] Alternatively, a heat-conducting adhesive is arranged between the heat dissipation member 40 and the battery cell 30. The heat-conducting adhesive can fill the small gap between the heat dissipation member 40 and the battery cell 30, ensuring that the two are tightly attached and avoiding displacement or loosening problems caused by vibration or external impact, thereby enhancing the stability of the overall structure. In addition, the heat-conducting adhesive has a certain elasticity and can absorb and buffer external vibrations to a certain extent, protecting the battery cell 30 from mechanical damage. Furthermore, the heat-conducting adhesive has a high thermal conductivity, which can quickly conduct the heat generated by the battery cell 30 to the heat dissipation member 40, reducing thermal resistance and improving heat dissipation efficiency, thereby helping to maintain the battery cell 30 within a relatively stable temperature range, prolonging its service life.

[0076] In combination Figures 4-5 The phase change material part 46 is arranged in the inner cavity 420 of the heat dissipation member 40, and the inner cavity 420 of the heat dissipation member 40 is in gas communication with the first exhaust passage 201.

[0077] The phase change material part 46 in the inner cavity 420 of the heat dissipation member 40 comprises a phase change material. Preferably, the phase change material can absorb heat at high temperature, and can be a solid-gas phase change material or a liquid-gas phase change material. In normal use, the phase change material does not change phase, but when the temperature around the heat dissipation member 40 rises (for example, the temperature of the battery cell 30 is high), the phase change material can change phase from solid to gas or from liquid to gas after absorbing enough heat. In this way, the phase change material can absorb a large amount of heat during the phase change, effectively preventing the battery cell 30 from overheating.

[0078] The phase change material can be a phase change material known in the prior art. The phase change material itself is not the core of the present application, and therefore will not be described here.

[0079] Of course, the phase change material can also be other heat-absorbing materials with the same effect.

[0080] In some embodiments as shown in the drawings, the top of the bearing boss 20 is provided with a first pressure relief hole 221, and the first pressure relief hole 221 is in communication with the first exhaust passage 201. The bottom of the heat dissipation member 40 is provided with a first exhaust hole 41, and the first exhaust hole 41 is arranged opposite to the first pressure relief hole 221. Figure 3

[0081] In the above technical solution, by directly aligning the first exhaust hole 41 with the first pressure relief hole 221, the first exhaust passage 201 is directly communicated with the inner cavity 420 of the heat dissipation member 40, reducing the need for intermediate transition parts and reducing the number of intermediate connection points, thereby reducing potential leakage points in the exhaust passage and improving the sealing performance and reliability of the first exhaust passage 201.

[0082] At the same time, removing the intermediate transition part means reducing the need for additional materials, thereby reducing manufacturing costs.

[0083] In some optional embodiments, a sealing member is arranged between the first exhaust hole 41 and the first pressure relief hole 221. In this way, the air tightness of the connection can be ensured to prevent gas leakage. For example, the sealing member can be a rubber ring or a silicone ring.

[0084] Optionally, a glue layer is arranged between the first exhaust hole 41 and the first pressure relief hole 221. By arranging the glue layer, not only the air tightness of the connection can be ensured to prevent gas leakage, but also the stability and sealing effect of the structure are further enhanced.

[0085] Preferably, the first pressure relief hole 221 and the first exhaust hole 41 are adapted in shape and size. In this way, the two can be well connected, thereby achieving smooth flow of gas and reducing flow resistance. This arrangement not only improves the sealing performance and reliability of the system, but also avoids gas leakage or blockage problems caused by mismatched shape or size, further enhancing the stability and reliability of the overall structure.​

[0086] Further, the first pressure relief hole 221 and the first exhaust hole 41 are circular holes, long strip-shaped holes or other regular-shaped holes. Of course, they can also be irregular-shaped holes.

[0087] In some optional embodiments, one of the first pressure relief hole 221 and the first exhaust hole 41 is a large hole, and the other is a small hole. The small hole is extended to form a boss, which is tightly nested with the large hole. Such a nested arrangement not only ensures the alignment accuracy of the two, but also enhances the overall rigidity of the connection. The shape of the boss can be annular or other shapes to adapt to different application scenarios.

[0088] Preferably, a sealing material piece is arranged on the boss surface of the small hole. The sealing material piece can be an O-ring or sealant, further enhancing the sealing effect. Such an arrangement not only takes advantage of the preliminary sealing brought by physical nesting, but also ensures that gas cannot leak through additional sealing measures.

[0089] In some specific embodiments, as shown in Figure 5 The heat dissipation piece 40 further includes a gas permeable valve 411 arranged at the first exhaust hole 41.

[0090] Specifically, when the phase change material undergoes phase change and generates gas during heat absorption, the gas permeable valve 411 can effectively block the phase change material in liquid or solid state from entering the first exhaust passage 201. This not only avoids the risk of clogging the first exhaust passage 201, but also prevents the phase change material from flowing out and affecting the heat dissipation effect, improving the reliability of the battery pack 100.

[0091] According to some optional embodiments of the present application, referring to Figure 4 and Figure 5 The heat dissipation piece 40 further includes: an encapsulation shell 42, the encapsulation shell 42 has an inner cavity 420 therein, the phase change material part 46 is located in the encapsulation shell 42, and the inner cavity 420 further includes a second exhaust passage 45 located at least one side of the phase change material part 46. In combination with Figure 5 The encapsulation shell 42 is provided with a first exhaust hole 41 connected with the second exhaust passage 45, and the first exhaust hole 41 is in gas communication with the first exhaust passage 201.

[0092] The encapsulation shell 42 is used to accommodate and protect the phase change material part 46, preventing it from being affected by external environment such as dust, moisture and other pollutants, which helps to prolong the service life of the phase change material and ensure its stable performance under various working conditions.

[0093] Preferably, the encapsulation shell 42 is an aluminum shell, an aluminum alloy shell or a stainless steel shell, etc. to provide sufficient mechanical strength and avoid damage caused by external impact or vibration.

[0094] The second exhaust passage 45 can achieve gas-liquid or gas-solid separation. The gas generated after the phase change material absorbs heat directly enters the second exhaust passage 45, and then enters the first exhaust passage 201 through the first exhaust hole 41 to achieve heat dissipation.

[0095] When the phase change material changes phase during heat absorption, its volume will change to a certain extent. The second exhaust passage 45 also provides additional expansion space for this volume change, avoiding pressure rise or damage to the packaging shell 42 caused by volume change. At the same time, the second exhaust passage 45 can also prevent the phase change material that has not been vaporized from being discharged from the first exhaust hole 41, thereby improving the heat absorption amount of the heat dissipation member 40 and the overall heat dissipation efficiency.

[0096] Optionally, the inner cavity 420 of the packaging shell 42 is divided into two regions. One region is used to place the phase change material part 46, and the other region is used to set the second exhaust passage 45. The first exhaust passage 201 is located on one side of the packaging shell 42, the second exhaust passage 45 is located on the side of the packaging shell 42 close to the first exhaust passage 201, and the phase change material part 46 is located on the side of the packaging shell 42 away from the first exhaust passage 201.

[0097] In some optional embodiments, in combination with Figure 4 , the heat dissipation member 40 further comprises: a breathable packaging film 43, the breathable packaging film 43 being located in the packaging shell 42 and wrapped on the outer side surface of the phase change material part 46.

[0098] The breathable packaging film 43 serves as a physical barrier and is wrapped on the outer side of the phase change material part 46 to prevent the phase change material from leaking out of the inside of the packaging shell 42. This helps to protect other components from contamination and also ensures that the phase change material can work stably in a closed environment.

[0099] Although the breathable packaging film 43 can block the phase change material, it allows gas to pass through. When the phase change material generates gas after absorbing heat, these gases can be discharged through the breathable packaging film 43 to carry heat out through the gas.

[0100] Further, the breathable packaging film 43 is fixed at a specified position in the packaging shell 42 by an adhesive or other methods, ensuring that it does not loosen or fall off during long-term use, improving the use reliability of the battery pack 100.

[0101] In some optional embodiments, as shown in Figure 4 and Figure 5 , the heat dissipation member 40 further comprises: a support skeleton 44, the support skeleton 44 being located in the packaging shell 42, and the phase change material part 46 being arranged on the support skeleton 44 to be supported by the support skeleton 44.

[0102] The support framework 44 provides a firm support structure for the phase change material part 46, ensures its position fixed in the packaging shell 42, and prevents displacement or damage caused by vibration or external impact.

[0103] The support framework 44 also facilitates the formation of a more regular structure, thereby facilitating the wrapping of the vented packaging film 43. Alternatively, the support framework 44 can be a cuboid framework, a square framework, or a special structure framework.

[0104] In combination Figure 4 Alternatively, the shape and size of the support framework 44 are adapted to the shape and size of the inner cavity 420 of the packaging shell 42. On the one hand, this arrangement enables the support framework 44 to obtain the support of the packaging shell 42, enhancing its own stability and preventing displacement or deformation during use. On the other hand, the support framework 44 can maximize the use of the internal space of the packaging shell 42, increase the total capacity of the phase change material, and thus improve the heat absorption capacity of the heat sink 40.

[0105] In some specific embodiments, the support framework 44 includes a plurality of support rods. The support structure formed by the support rods enhances the overall mechanical strength and stability. At the same time, the support rods also have through holes between them, which helps to achieve a lightweight design.

[0106] In some alternative embodiments, the support framework 44 can be a high thermal conductivity material piece. For example, the support framework 44 can be an aluminum alloy material piece, a copper piece, etc. These material pieces have a certain support strength, ensuring the structural stability and rigidity of the support framework 44. At the same time, they can quickly transfer heat to the phase change material, ensuring the heat absorption effect of the heat sink 40.

[0107] According to the battery pack 100 of some embodiments of the present application, Figure 6 The heat sink 40 is arranged to extend in the first direction, and the second exhaust passage 45 includes a bottom passage 451 and two side passages 452. The bottom passage 451 is located below the phase change material part 46, and the bottom passage 451 is arranged to extend in the first direction. The first exhaust hole 41 communicates with the bottom passage 451. The two side passages 452 are located at both ends of the heat sink 40, and the lower ends of the two side passages 452 communicate with the bottom passage 451.

[0108] In the above technical solution, the bottom passage 451 is located below the phase change material part 46 and extends in the first direction, providing an expansion space for the phase change material in the longitudinal space. When the phase change material absorbs heat and increases in volume, the bottom passage 451 can effectively accommodate this amount of expansion.

[0109] Meanwhile, two side passages 452 are respectively arranged at two ends of the heat dissipation member 40, and the lower ends of the two side passages 452 are communicated with the bottom passage 451, so as to further expand the expansion space to the longitudinal direction. The multi-directional layout enables the phase change material to expand more freely in the packaging shell 42, and reduces the stress concentration problem caused by the volume change.

[0110] In addition, the layout can also optimize the gas discharge path, ensure that the generated gas can smoothly diffuse to the first exhaust passage 201 through the second exhaust passage 45, prevent the gas from being blocked, and thus improve the stability of the heat dissipation system.

[0111] According to some optional embodiments of the utility model, as shown in Figures 1-3 , the plurality of battery cells 30 are arranged along the second direction, and the heat dissipation member 40 is at least one and is clamped between the two adjacent battery cells 30.

[0112] By arranging the heat dissipation member 40 between the two battery cells 30 and directly contacting the two battery cells 30, the heat generated by the battery cells 30 can be quickly transferred to the heat dissipation member 40, and then absorbed and dissipated by the phase change material, thereby providing an efficient heat conduction path.

[0113] In some optional embodiments, as shown in Figure 2 , the battery pack 100 includes a plurality of battery cell groups X arranged along the second direction, and one heat dissipation member 40 is arranged between the two adjacent battery cell groups X. Each battery cell group X includes a plurality of battery cells 30. The number of battery cells 30 included in each battery cell group X can be the same or different.

[0114] The bearing boss 20 is arranged to extend along the second direction, and in combination with Figure 7 , the battery cell 30 is provided with a second exhaust hole 31, and the second exhaust hole 31 is communicated with the first exhaust passage 201. The battery cell 30 further includes an explosion-proof valve 311 arranged at the second exhaust hole 31.

[0115] The second exhaust hole 31 can effectively discharge the gas generated in the battery cell 30 due to overheating or other reasons, and prevent the problem of pressure rise caused by gas accumulation. By connecting the second exhaust hole 31 with the first exhaust passage 201, the gas can be discharged more efficiently and smoothly, thereby ensuring the safe operation of the battery pack 100.

[0116] The explosion-proof valve 311 arranged at the second exhaust hole 31 can help to release the pressure in the battery cell 30, prevent the explosion risk caused by excessive pressure, and thus improve the safety of the single battery cell 30, and ensure the stability and reliability of the entire battery pack 100. At the same time, the explosion-proof valve 311 can also effectively prevent sparks from the outside from entering the battery cell 30, thereby further reducing the risk of fire or explosion.

[0117] In some optional embodiments, in combination with Figures 8-9The carrier boss 20 is at least two arranged along the first direction, and each carrier boss 20 is provided with a first exhaust passage 201. Each battery cell 30 and each heat dissipation piece 40 is a heat-generating piece, and a plurality of heat-generating pieces are arranged along the second direction. The heat-generating end of the heat dissipation piece 40 is a first exhaust hole 41, and the heat-generating end of the battery cell 30 is a second exhaust hole 31. The heat-generating end of the plurality of heat-generating pieces is alternately connected to the first exhaust passage 201 of the at least two carrier bosses 20.

[0118] In the above technical solution, adjacent heat-generating pieces are connected to the first exhaust passages 201 of different carrier bosses 20. Heat is directed into the first exhaust passages 201 of different carrier bosses 20 to achieve balanced distribution of heat.

[0119] Specifically, the carrier boss 20 is two arranged along the first direction. Adjacent heat-generating pieces (battery cells 30 and heat dissipation pieces 40) are connected to the first exhaust passages 201 of different carrier bosses 20. For example, the heat-generating end of the first heat-generating piece is connected to the first exhaust passage 201 of one carrier boss 20, and the heat-generating end of the adjacent second heat-generating piece is connected to the first exhaust passage 201 of another carrier boss 20. This alternating connection helps to balance the heat distribution and prevent local overheating.

[0120] According to some optional embodiments, as shown in Figures 9-11 The carrier boss 20 includes a carrier top plate 22 and two carrier side plates 24. The carrier top plate 22 is provided with at least one of a first pressure relief hole 221 and a second pressure relief hole 222. The first pressure relief hole 221 is used to connect the heat-generating end of the heat dissipation piece 40, and the second pressure relief hole 222 is used to connect the heat-generating end of the battery cell 30. The two carrier side plates 24 are respectively connected to the two sides of the carrier top plate 22, and the lower end of each carrier side plate 24 is connected to the bottom plate 10.

[0121] In the above technical solution, the carrier top plate 22 is provided with at least one first pressure relief hole 221 and second pressure relief hole 222. The first pressure relief hole 221 is used to connect the heat-generating end of the heat dissipation piece 40 (i.e. the first exhaust hole 41), and the second pressure relief hole 222 is used to connect the heat-generating end of the battery cell 30 (i.e. the second exhaust hole 31). The design of these pressure relief holes allows the gas discharged from the heat dissipation piece 40 and the battery cell 30 to smoothly enter the first exhaust passage 201 of the carrier boss 20, thereby achieving effective gas discharge.

[0122] Two side plates 24 are connected to the top plate 22 on both sides, so that the entire bearing boss 20 forms a "J" shape structure. This setting not only provides additional mechanical support for the top plate 22, but also enhances the stability and rigidity of the overall structure. The lower end of each side plate 24 is connected to the chassis 10, forming a stable overall frame, ensuring that the structure will not be damaged by external impact or vibration during use.

[0123] In some alternative embodiments, the top plate 22 and the two side plates 24 are integrally formed.

[0124] Firstly, the integrally formed bearing boss 20 has no joints or welds, thereby avoiding potential weaknesses caused by joints or welds, ensuring higher mechanical strength and durability.

[0125] Secondly, the integrally formed process reduces the steps of assembling multiple components, reducing manufacturing complexity and cost. In addition, no additional welding or fixing operation is required, further improving production efficiency and product consistency.

[0126] According to some alternative embodiments, as shown in Figures 10-11 The chassis 10 includes a bottom plate 11 and a side plate 13 connected to the edge of the bottom plate 11. The bearing boss 20 is provided on the bottom plate 11.

[0127] The bottom plate 11 can provide support for the entire battery pack 100.

[0128] Optionally, the bearing boss 20 is firmly connected to the bottom plate 11, usually by bolts, welding or other fastening methods, to ensure its structural stability during use.

[0129] As shown in Figures 11-13 The battery pack 100 also includes a reinforcing plate 51, one end of which is connected to the side plate 13 and the other end is connected to the bearing boss 20.

[0130] Optionally, the reinforcing plate 51 is firmly connected to the side plate 13 and the bearing boss 20 by bolts, welding or other high-strength fastening methods.

[0131] In some alternative embodiments, there are multiple reinforcing plates 51, which are arranged at different positions of the bearing boss 20 to adapt to different loads and application scenarios. For example, in some areas where heat is more concentrated, the number of reinforcing plates 51 can be increased or larger size reinforcing plates 51 can be used to improve the stability and strength of the structure.

[0132] In some alternative embodiments, the bottom plate 11 and the side plate 13 are integrally formed by stamping, and the reinforcing plate 51 and the bearing boss 20 are welded to the chassis 10.

[0133] In the above technical solution, the box bottom plate 11 and the box side plate 13 are one-piece stamping parts, which means that the entire chassis 10 is formed by stamping a continuous sheet of metal without the need for additional splicing or welding procedures. The one-piece stamping part avoids potential weaknesses caused by joints or welding points, ensuring higher mechanical strength and durability.

[0134] At the same time, the one-piece stamping part has better material consistency and uniformity, reducing the difference in thermal expansion coefficient between different parts, thereby improving the reliability and long-term stability of the battery pack 100.

[0135] The reinforcing plate 51 is welded to the chassis. Further, one end of the reinforcing plate 51 is welded to the box side plate 13, and the other end is welded to the load-bearing boss 20, forming a stable support structure, which improves the stability of the load-bearing boss 20 and ensures stable communication between the inner cavity 420 of the heat dissipation member 40 and the first exhaust passage 201, thereby ensuring heat dissipation efficiency and improving the use reliability of the battery pack 100.

[0136] The load-bearing boss 20 is welded to the chassis 10. Further, the load-bearing boss 20 is welded to the box bottom plate 11. The welding connection helps to enhance the use stability of the load-bearing boss 20 and helps to achieve stable communication between the inner cavity 420 of the heat dissipation member 40 and the first exhaust passage 201, thereby ensuring heat dissipation efficiency and improving the use reliability of the battery pack 100.

[0137] In some optional embodiments, as shown in Figure 14 The battery pack 100 further includes a total exhaust valve 52 provided on the chassis 10, and the total exhaust valve 52 is located at least one end of the load-bearing boss 20.

[0138] Here, the total exhaust valve 52 serves as a concentrated exhaust port of the first exhaust passage 201 and is responsible for concentrating and exhausting the gas collected in the first exhaust passage 201 out of the battery pack 100.

[0139] Optionally, the total exhaust valve 52 is located at one end of the load-bearing boss 20. This allows the gas to be concentrated and exhausted, achieving rapid heat dissipation and preventing overheating of the battery pack 100.

[0140] In yet other optional embodiments, the total exhaust valve 52 is located at both ends of the load-bearing boss 20. In this way, the gas can be exhausted from both ends of the load-bearing boss 20, ensuring more uniform and efficient gas flow and stable operation of the battery pack 100.

[0141] In some optional embodiments, the bearing boss 20 is in a rod shape extending along the second direction, and two ends of the bearing boss 20 are provided with openings 202 communicating with the first exhaust channel 201. The total exhaust valve 52 is arranged on the bottom plate 10, and one end of the total exhaust valve 52 is located in the battery pack 100 and is arranged towards the opening 202 of the bearing boss 20. When the total exhaust valve 52 is arranged at only one end of the bearing boss 20, the other end opening 202 is arranged in a blocked manner.

[0142] In the above technical solution, the rod-shaped bearing boss 20 is beneficial to form a more compact structure, so as to save the occupied space in the battery pack 100.

[0143] Meanwhile, the rod-shaped bearing boss 20 makes the first exhaust channel 201 extend in a linear shape, which is beneficial to the smooth exhaust of the gas in the first exhaust channel 201.

[0144] Optionally, when the total exhaust valve 52 is two, the two total exhaust valves 52 are respectively located at the two ends of the bearing boss 20.

[0145] Optionally, when the total exhaust valve 52 is one, the total exhaust valve 52 is located at one end of the bearing boss 20, and the opening 202 at the other end of the bearing boss 20 is arranged in a blocked manner.

[0146] In some optional embodiments, the opening 202 is blocked by a blocking piece. The blocking piece can be a rubber plug or a metal cover plate. Preferably, there is also a glue layer between the blocking piece and the opening 202.

[0147] In some optional embodiments, as shown in Figure 8 and Figure 12 , the bottom plate 10 comprises a bottom plate 11 and a side plate 13, and the bearing boss 20 is arranged on the bottom plate 11. Referring to Figure 8 , the battery pack 100 further comprises at least one reinforcing plate 54, and the reinforcing plate 54 is connected to the side plate 13.

[0148] The reinforcing plate 54 can enhance the strength of the side plate 13, so as to reinforce the overall strength of the battery pack 100.

[0149] In some optional embodiments, the reinforcing plate 54 is connected to the side plate 13 by welding. The welding connection can prevent the two from being separated.

[0150] Further, the reinforcing plate 54 is four, and is connected to the four side plates 13 respectively. By arranging the reinforcing plate 54 around the battery cell 30, the structural strength of the battery pack 100 can be ensured.

[0151] According to some optional embodiments of the utility model, as shown in Figure 8 , the bottom plate 10 comprises a bottom plate 11 and a side plate 13, and the battery pack 100 further comprises a bottom guard plate 55, and the bottom guard plate 55 is arranged at the bottom of the bottom plate 11.

[0152] The bottom protection plate 55 can enhance the structural strength of the box bottom plate 11, improve the rigidity of the chassis 10, and improve the use reliability of the battery pack 100.

[0153] The optimized bottom protection plate 55 and the box bottom plate 11 also have a buffer structure. The buffer structure can effectively buffer the energy absorption and improve the performance of the box bottom plate 11 in resisting external load impact. When facing a large intensity load impact, the buffer structure can effectively absorb and weaken the impact force, prevent the load from piercing the bottom of the battery pack 100, thereby protecting the battery cells 30 carried from being damaged, and ensuring the use safety of the battery pack 100.

[0154] In combination Figure 8 and Figure 14 In some optional embodiments, the battery pack 100 further comprises at least one anti-swelling beam 53 located at at least one end of the chassis 10 along the second direction.

[0155] By setting the anti-swelling beam 53, it helps to prevent the battery cells 30 from over-expanding and avoid causing pressure to other components inside the battery pack 100, thereby protecting the overall structural integrity and safety of the battery pack 100.

[0156] At the same time, when the battery cells 30 over-expand, the pole displacement of the battery cells 30 will occur, which may cause the wire to loosen or break. This not only affects the electrical connection stability of the battery pack 100, but also may cause short circuit or other electrical faults, seriously affecting the safety and performance of the battery pack 100. The anti-swelling beam 53 limits the expansion of the battery cells 30 through physical constraint, reduces the displacement of the pole of the battery cells 30 caused by expansion, thereby reducing the risk of wire loosening and improving the reliability and safety of the battery pack 100.

[0157] According to the power device of the second aspect of the utility model, comprising the battery pack 100 according to the first aspect of the utility model.

[0158] With the improved battery pack 100, it is convenient to make the power device realize the timely gathering of high-temperature gas, and guide the high-temperature gas to the outside of the battery pack 100, thereby improving the use reliability of the power device.

[0159] The following refers to Figure 1 - Figure 4 The battery pack 100 according to the embodiments of the utility model is described in detail with a specific embodiment. It is worth understanding that the following description is only exemplary and is not a specific limitation of the utility model.

[0160] Referring to Figure 1 , Figure 8 , Figure 11 , Figure 13 and Figure 14The battery pack 100 comprises a base plate 10, a bearing boss 20, a battery cell 30, a heat sink 40, a reinforcing plate 51, a total exhaust valve 52, an anti-expansion beam 53, a reinforcing plate 54 and a bottom guard plate 55.

[0161] With reference to Figure 1 , Figure 8 and Figure 12 , the base plate 10 comprises a box bottom plate 11 and a box side plate 13 connected to the edge of the box bottom plate 11. The box bottom plate 11 and the box side plate 13 are an integrated stamping forming.

[0162] With reference to Figure 8 , the reinforcing plate 54 is connected to the box side plate 13.

[0163] With reference to Figure 10 , one end of the reinforcing plate 51 is welded to the box side plate 13, and the other end is connected to the bearing boss 20.

[0164] With reference to Figure 8 , the bottom guard plate 55 is arranged at the bottom of the box bottom plate 11.

[0165] The bearing boss 20 is welded to the box bottom plate 11, and the bearing boss 20 is two arranged in a first direction, each bearing boss 20 is arranged in a second direction, and each bearing boss 20 is provided with a first exhaust passage 201.

[0166] With reference to Figure 9 and Figure 10 , the bearing boss 20 comprises a bearing top plate 22 and two bearing side plates 24.

[0167] With reference to Figure 3 , the bearing top plate 22 is provided with a first pressure relief hole 221 and a second pressure relief hole 222. The first pressure relief hole 221 is used to connect the heated gas inlet end of the heat sink 40, and the second pressure relief hole 222 is used to connect the heated gas inlet end of the battery cell 30. The first pressure relief hole 221 and the second pressure relief hole 222 are in communication with the first exhaust passage 201.

[0168] The two bearing side plates 24 are respectively connected to the two sides of the bearing top plate 22, and the lower end of each bearing side plate 24 is connected to the base plate 10.

[0169] The battery cell 30 is arranged on the base plate 10 and is arranged on the bearing boss 20.

[0170] With reference to Figure 2 and Figure 3 , the heat sink 40 is a plurality of heat sinks 40, and the plurality of heat sinks 40 are respectively arranged between the battery cells 30. Each heat sink 40 has a battery cell 30 on both sides.

[0171] Here, each of the battery cells 30 and each of the heat dissipation pieces 40 is a heat receiving and gas producing piece. The plurality of heat receiving and gas producing pieces are arranged along the second direction. The heat receiving and gas delivery end of the heat dissipation piece 40 is provided with a first gas discharge hole 41, and the heat receiving and gas delivery end of the battery cell 30 is provided with a second gas discharge hole 31. The first gas discharge hole 41 is arranged opposite to the first pressure relief hole 221. The second gas discharge hole 31 communicates with the first gas discharge passage 201.

[0172] With reference to Figure 5 , the first gas discharge hole 41 is provided with a gas permeable valve 411.

[0173] With reference to Figure 7 , the second gas discharge hole 31 is provided with an explosion-proof valve 311.

[0174] The heat receiving and gas delivery ends of the plurality of heat receiving and gas producing pieces are alternately connected to the first gas discharge passage 201 on the two bearing bosses 20.

[0175] With reference to Figure 4 and Figure 5 , the heat dissipation piece 40 further comprises: an encapsulation shell 42, a gas permeable encapsulation film 43, and a support framework 44.

[0176] The heat dissipation piece 40 is arranged along the first direction. The encapsulation shell 42 has an inner cavity 420 therein, and the phase change material portion 46 is located in the encapsulation shell 42. The inner cavity 420 further comprises a second gas discharge passage 45 located on one side of the phase change material portion 46.

[0177] With reference to Figure 5 and Figure 6 , the second gas discharge passage 45 comprises: a bottom passage 451. The bottom passage 451 is located below the phase change material portion 46, and the bottom passage 451 is arranged along the first direction. The first gas discharge passage 201 communicates with the bottom passage 451.

[0178] The gas permeable encapsulation film 43 is located in the encapsulation shell 42 and wrapped around the outer side surface of the phase change material portion 46.

[0179] The support framework 44 is located in the encapsulation shell 42, and the phase change material portion 46 is arranged on the support framework 44 to be supported by the support framework 44.

[0180] The two ends of the bearing boss 20 are provided with openings 202 that communicate with the first gas discharge passage 201.

[0181] With reference to Figure 13 , the total discharge valve 52 is located at the two ends of the bearing boss 20.

[0182] With reference to Figure 14 , the total discharge valve 52 is arranged on the base plate 10. One end of the total discharge valve 52 is located in the battery pack 100 and is arranged towards the opening 202 of the bearing boss 20

[0183] With reference to Figure 8The anti-bulging beams 53 are two, and the two anti-bulging beams 53 are respectively located at two ends of the chassis 10 along the second direction.

[0184] Other configurations of the battery pack 100, such as an electric device and the like, and operations are known to those skilled in the art, and will not be described in detail here.

[0185] In the description of the present specification, the description referring to the terms "embodiment", "example", and the like means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0186] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized by, The application relates to a battery pack, which comprises a chassis, a bearing boss arranged on the chassis, a first exhaust passage arranged on the bearing boss, an electric core arranged on the chassis and on the bearing boss, a heat dissipation piece arranged on the chassis and on the bearing boss, the heat dissipation piece being in contact with the electric core, a phase change material part arranged in the inner cavity of the heat dissipation piece, and the inner cavity of the heat dissipation piece being in air communication with the first exhaust passage. The top of the bearing boss is provided with a first pressure relief hole, and the first pressure relief hole is in communication with the first exhaust passage. The bottom of the heat dissipation piece is provided with a first exhaust hole, and the first exhaust hole is arranged opposite to the first pressure relief hole. The heat dissipation piece further comprises a gas-permeable valve arranged at the first exhaust hole. The heat dissipation piece further comprises a packaging shell, the inner cavity of the heat dissipation piece is arranged in the packaging shell, the phase change material part is arranged in the packaging shell, and the inner cavity of the heat dissipation piece further comprises a second exhaust passage arranged on at least one side of the phase change material part.

2. The battery pack of claim 1, wherein, The packaging shell is provided with a first exhaust hole connected with the second exhaust passage, and the first exhaust hole is in air communication with the first exhaust passage. The heat dissipation piece further comprises a gas-permeable packaging film arranged on the outer side surface of the phase change material part.

3. The battery pack of claim 2, wherein, The heat dissipation piece further comprises a support framework arranged in the packaging shell, and the phase change material part is arranged on the support framework and supported by the support framework.

4. The battery pack of claim 1, wherein, The heat dissipation piece is arranged in a first direction, and the second exhaust passage comprises a bottom passage arranged below the phase change material part and extending in the first direction, and two side passages arranged at two ends of the heat dissipation piece and in communication with the bottom passage. The electric core is arranged in a second direction, and the heat dissipation piece is at least one and is arranged between two adjacent electric cores. The bearing boss is arranged in the first direction, the electric core is provided with a second exhaust hole, the second exhaust hole is in communication with the first exhaust passage, and the electric core further comprises an explosion-proof valve arranged at the second exhaust hole.

5. The battery pack of claim 4, wherein, The bearing boss is at least two and is arranged in the first direction, and each bearing boss is provided with the first exhaust passage. Each electric core and each heat dissipation piece is a heat-generating piece, a plurality of heat-generating pieces are arranged in the second direction, the heat-generating end of the heat dissipation piece is the first exhaust hole, and the heat-generating end of the electric core is the second exhaust hole.

6. The battery pack of claim 4, wherein, The heat-generating end of the plurality of heat-generating pieces is alternately connected with the first exhaust passage of the at least two bearing bosses. The bearing boss comprises a bearing top plate provided with at least one of a first pressure relief hole and a second pressure relief hole, the first pressure relief hole is used for connecting the heat-generating end of the heat dissipation piece, and the second pressure relief hole is used for connecting the heat-generating end of the electric core.

7. The battery pack of claim 4, wherein, Two bearing side plates are respectively connected to two sides of the bearing top plate, and the lower end of each bearing side plate is connected with the chassis. ​ ​ 8. The battery pack of any one of claims 1-7, wherein, ​ ​ 9. The battery pack of claim 8, wherein, ​ ​ ​ 10. The battery pack of any one of claims 1-7, wherein, ​ ​ ​ 11. The battery pack of claim 10, wherein, The bottom plate comprises a box bottom plate and a box side plate connected to the edge of the box bottom plate; The load bearing boss is arranged on the box bottom plate; The battery pack further comprises a reinforcing plate, one end of which is connected to the box side plate and the other end of which is connected to the load bearing boss.

12. The battery pack of claim 11, wherein, The box bottom plate and the box side plate are integrally formed by stamping, and the reinforcing plate and the load bearing boss are welded to the bottom plate.

13. The battery pack of any one of claims 1-7, wherein, A total exhaust valve is further arranged on the bottom plate, and the total exhaust valve is arranged at least at one end of the load bearing boss.

14. The battery pack of claim 13, wherein, The load bearing boss is in the shape of a rod extending in the second direction, and both ends of the load bearing boss are provided with openings communicating with the first exhaust channel; The total exhaust valve is arranged on the bottom plate, and one end of the total exhaust valve is arranged in the battery pack and faces the opening of the load bearing boss; When the total exhaust valve is arranged at only one end of the load bearing boss, the opening at the other end is blocked.

15. The battery pack of any one of claims 1-7, wherein, The bottom plate comprises a box bottom plate and a box side plate, and the load bearing boss is arranged on the box bottom plate; The battery pack further comprises at least one reinforcing plate, and the reinforcing plate is connected to the box side plate.

16. The battery pack of any one of claims 1-7, wherein, The bottom plate comprises a box bottom plate and a box side plate, and the battery pack further comprises a bottom guard plate arranged at the bottom of the box bottom plate.

17. The battery pack of any one of claims 1-7, wherein, A bulge prevention beam is further arranged, and the bulge prevention beam is at least one and arranged at at least one end of the bottom plate in the second direction.

18. An electrical device, comprising: The battery pack comprises the battery pack according to any one of claims 1-17.

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