Battery and power consuming device

Abstract

A battery and an electrical device, the battery comprising: a housing (10) having a receiving cavity (101); a battery assembly (20) disposed within the receiving cavity (101); a thermal management component (30) configured to heat and cool the battery assembly (20), the thermal management component (30) including a second heat exchanger (32) disposed between the battery assembly (20) and the top and / or bottom wall of the receiving cavity (101); and a phase change material component (40) extending circumferentially along the battery assembly (20) and disposed on the periphery of the battery assembly (20) for heat exchange with the battery cells (211) on the periphery of the battery assembly (20).

Description

Battery and power consuming device

[0001] Cross-reference to related applications

[0002] The present application is based on and claims priority to Chinese Patent Application No. 202421300313.4, filed on June 7, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a battery and a power consuming device. BACKGROUND

[0004] At present, in order to ensure the normal operation and service life of the battery, a heat exchange element is usually arranged in the battery, which can exchange heat with the battery monomer to adjust the temperature of each battery monomer, thereby ensuring the service life of the battery. However, at present, the temperature uniformity of multiple battery monomers in the battery pack needs to be further improved.

[0005] SUMMARY

[0006] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a battery and a power consuming device comprising the same, which can slow down the temperature change rate of the battery monomers on the periphery of the battery assembly, make the temperature change rates of different parts of the battery assembly consistent, improve the temperature uniformity of the battery assembly, and prolong the service life of the battery.

[0007] In a first aspect, embodiments of the present application provide a battery, comprising: a box body having a receiving cavity; a battery assembly arranged in the receiving cavity; a thermal management element configured to heat and cool the battery assembly, the thermal management element comprising: a second heat exchange element arranged between the battery assembly and a top wall and / or a bottom wall of the receiving cavity; and a phase change material element extending along the periphery of the battery assembly and arranged on the periphery of the battery assembly to exchange heat with the battery monomers on the periphery of the battery assembly.

[0008] In the above technical solution, since the phase change material element is arranged on the periphery of the battery assembly, the phase change material element can store or release heat when the thermal management element exchanges heat with the battery assembly, thereby slowing down the temperature change rate of the battery monomers on the periphery of the battery assembly, making the temperature change rates of different parts of the battery assembly consistent, and when the thermal management element stops exchanging heat with the battery assembly, the phase change material element can keep the battery monomers on the periphery of the battery assembly warm, making the heat dissipation rate of the battery monomers on the periphery consistent with that of the remaining battery monomers, thereby improving the temperature uniformity of the battery assembly and prolonging the service life of the battery.

[0009] According to an example of the present application, the phase change material element is arranged between the battery assembly and the side wall of the receiving cavity.

[0010] In the above technical solution, the phase change material piece is arranged between the battery assembly and the side wall of the accommodating cavity, so that the phase change material piece can be conveniently arranged and contacted with the battery assembly for heat exchange. The phase change material piece can also be arranged as a buffer structure between the battery assembly and the side wall of the accommodating cavity, so as to reduce the probability of impact between the battery assembly and the side wall of the accommodating cavity and improve the safety performance of the battery assembly.

[0011] According to an example of the present application, the phase change material piece includes a shell and a phase change material, and the shell defines a cavity, and the phase change material is filled in the cavity.

[0012] In the above technical solution, the phase change material piece includes a shell and a phase change material filled in the shell, and the shell can provide a space for the phase change material, so that the structure of the phase change material can be simplified and the cost of the phase change material piece can be reduced.

[0013] According to an example of the present application, the shell includes a metal layer and an insulating film layer arranged on both sides of the metal layer in the thickness direction.

[0014] In the above technical solution, since the shell includes a metal layer and an insulating film layer arranged on both sides of the metal layer in the thickness direction, the structural strength of the shell can be improved, the probability of leakage of the phase change material can be reduced, and the insulation performance of the phase change material piece can be improved.

[0015] According to an example of the present application, the shell includes a first half shell and a second half shell arranged in the thickness direction of the phase change material piece, and the periphery of the first half shell is sealingly connected to the periphery of the second half shell in the thickness direction of the shell, and cooperates to define a cavity.

[0016] In the above technical solution, the cavity is formed by the periphery of the first half shell and the periphery of the second half shell, so that the structure of the shell can be further simplified and the processing and manufacturing can be facilitated.

[0017] According to an example of the present application, the phase change material piece includes a phase change material configured to undergo solid-liquid phase change within a preset working temperature range of the battery assembly.

[0018] In the above technical solution, by setting the phase change material to undergo solid-liquid phase change within the preset working temperature range, the volume change of the phase change material when the state changes can be reduced, the pressure change in the phase change material piece can be reduced, the probability of leakage of the phase change material can be reduced, and the battery assembly can always be maintained within the preset working temperature range, the probability of the battery assembly operating beyond the preset working temperature range can be reduced, and the safety and stability of the battery assembly can be improved.

[0019] According to an example of the present application, the phase change material is paraffin or a supersaturated salt solution.

[0020] In the technical solution, the phase change material is paraffin or a supersaturated salt solution, so that the cost of the phase change material piece is reduced.

[0021] According to an example of the present application, the phase change material piece further comprises a suction member configured to be suitable for adsorbing the liquid phase change material.

[0022] In the technical solution, the suction member is used to adsorb the liquid phase change material, so that the liquid phase change material is uniformly distributed in the phase change material piece, and the temperature uniformity of each position of the phase change material piece is improved.

[0023] According to an example of the present application, the suction member is a porous material piece.

[0024] In the technical solution, the suction member is a porous material piece, so that the adsorption performance of the suction member to the liquid phase change material is improved, and the temperature uniformity of each position of the phase change material piece is improved.

[0025] According to an example of the present application, the box body comprises a beam body, the beam body encloses a containing cavity, the beam body has a cavity, and the phase change material piece is arranged in at least part of the cavity.

[0026] In the technical solution, the phase change material piece is arranged in the cavity of the beam body, the phase change material piece can exchange heat with the battery monomers on the circumferential side of the battery assembly through the beam body, the temperature uniformity of the battery is improved, and meanwhile, the phase change material piece does not need to occupy the space inside the box body, so that the structure is compact, and the energy density of the battery is improved.

[0027] According to an example of the present application, the number of phase change material pieces is multiple, and the multiple phase change material pieces are arranged at intervals along the circumference of the battery assembly.

[0028] In the technical solution, the multiple phase change material pieces are arranged at intervals along the circumference of the battery assembly, so that the phase change material pieces can exchange heat with more battery monomers on the circumferential side of the battery assembly, and the temperature uniformity of the battery is further improved.

[0029] According to an example of the present application, the battery assembly comprises multiple monomer groups, the multiple monomer groups are arranged in sequence along a first direction, each monomer group comprises multiple battery monomers arranged in sequence along a second direction, the phase change material piece is arranged on the opposite sides of the battery assembly in the first direction, and / or the phase change material piece is arranged on the opposite sides of the battery assembly in the second direction, and the first direction is perpendicular to the second direction.

[0030] In the technical solution, the phase change material piece is arranged on the opposite sides of the battery assembly in the first direction and / or the second direction, so that the phase change material piece can exchange heat with more battery monomers on the circumferential side of the battery assembly, and the temperature uniformity of the battery is further improved.

[0031] According to an example of the present application, the heat management member comprises: a first heat exchange member, the first heat exchange member extends along the second direction, the first heat exchange member is arranged between the adjacent single groups and on both sides of the battery assembly in the first direction, and the phase change material member is arranged between the side wall of the accommodating cavity and the first heat exchange member.

[0032] In the above technical solution, since the plurality of first heat exchange members are arranged between the adjacent single groups, and the phase change material member is arranged between the side wall of the accommodating cavity and the first heat exchange member, when the first heat exchange member heats the battery assembly, the phase change material member can absorb the heat of the first heat exchange member, thereby reducing the temperature rise speed of the single groups on the periphery of the battery assembly, and when the first heat exchange member stops heating, the phase change material member can release heat, thereby reducing the heat dissipation speed of the single groups on the periphery of the battery assembly, thereby reducing the temperature difference between the single groups on the periphery of the battery assembly and the remaining single groups, and improving the uniform temperature performance of the battery assembly.

[0033] According to an example of the present application, the phase change material member is arranged on both sides of the battery assembly in the first direction.

[0034] In the above technical solution, since the phase change material member is arranged on both sides of the battery assembly, the phase change material member can directly or indirectly exchange heat with the second heat exchange member through the box, thereby absorbing the heat of the second heat exchange member, reducing the temperature rise speed and the heat dissipation speed of the battery single groups on the periphery of the battery assembly, and improving the uniform temperature performance of the battery assembly.

[0035] According to an example of the present application, the second heat exchange member comprises a heat exchange pipe, the heat exchange pipe reciprocally extends in the first direction, and the two ends of the heat exchange pipe in the first direction respectively extend to the side of the phase change material member away from the battery assembly.

[0036] In the above technical solution, since the second heat exchange member comprises the reciprocally extending heat exchange pipe, and the two ends of the heat exchange pipe are beyond the phase change heat exchange member, when heating, the heat exchange pipe can simultaneously heat the phase change material member and the battery single groups, and after stopping heating, the phase change material member can keep warm the single groups on the periphery of the battery assembly, thereby improving the uniform temperature performance of the battery assembly.

[0037] In a second aspect, the embodiments of the present application provide a power utilization device comprising the battery according to the first aspect of the present application.

[0038] In the above embodiment, by arranging the battery of the first aspect, and arranging the phase change material around the battery assembly, the phase change material can store or release heat when the heat management member exchanges heat with the battery assembly, slow down the temperature change speed of the battery cells around the battery assembly, and make the temperature change speed of each part of the battery assembly consistent. When the heat management member stops exchanging heat with the battery assembly, the phase change material can keep the battery cells around the battery assembly warm, so that the heat dissipation speed of the battery cells around the battery assembly is consistent with that of the remaining battery cells, thereby improving the temperature uniformity of the battery assembly, improving the service life of the battery, and improving the overall performance of the electrical equipment.

[0039] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0040] Fig. 1 is a schematic view of a vehicle according to an embodiment of the present application;

[0041] Fig. 2 is an exploded view of a battery according to an embodiment of the present application;

[0042] Fig. 3 is an exploded view of a battery not containing a cover according to an embodiment of the present application;

[0043] Fig. 4 is a partial enlarged view of the circled A in Fig. 3;

[0044] Fig. 5 is a schematic view of a partition beam, a battery assembly, a phase change material, and a plurality of first heat exchange members of a battery according to an embodiment of the present application;

[0045] Fig. 6 is a top view of the partition beam, the battery assembly, the phase change material, and the first heat exchange members shown in Fig. 5;

[0046] Fig. 7 is a sectional view along the line B-B in Fig. 6;

[0047] Fig. 8 is an enlarged view of the circled C in Fig. 7;

[0048] Fig. 9 is a schematic view of a partition beam, a battery assembly, a phase change material, a plurality of first heat exchange members, and a second heat exchange member of a battery according to an embodiment of the present application.

[0049] REFERENCE SIGNS:

[0050] 1, electrical equipment;

[0051] 100, battery; 200, controller; 300, motor;

[0052] 10, box; 101, containing cavity;

[0053] 11, first part; 111, beam body; 1101, cavity; 1111, frame beam; 1112, partition beam; 112, bottom plate;

[0054] 12, second part;

[0055] 20, battery assembly; 21, monomer group; 211, battery monomer; 21a, first monomer group;

[0056] 30, thermal management piece; 31, first heat exchange piece;

[0057] 32, second heat exchange piece; 321, heat exchange pipe; 3211, straight pipe section; 3212, bending section;

[0058] 40, phase change material piece;

[0059] 41, shell; 401, cavity; 411, first half shell; 412, second half shell;

[0060] 42, phase change material;

[0061] 50, bottom guard plate;

[0062] Y, first direction; X, second direction; Z, third direction. DETAILED DESCRIPTION

[0063] The embodiments of the technical scheme of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0065] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0066] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0067] In the description of the embodiments of the application, the term“and / or” only means an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character“ / ” herein generally means that the front and rear associated objects are in an“or” relationship.

[0068] In the description of the embodiments of the application, the term“a plurality of” means two or more (including two).

[0069] In the description of the embodiments of the application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the application.

[0070] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0071] At present, from the development of market situation, the application of power battery is more and more extensive. The power battery is not only applied to the energy storage power supply system of water power, fire power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0072] The temperature environment in the battery is affected by external weather conditions, and the battery cells in the battery need to be in a certain temperature range when operating. When the temperature in the battery is higher or lower than this range, the stability and performance of the battery will be greatly affected. For example, when the weather is hot, the battery cells need to be cooled to keep the temperature in the battery within the required temperature range. When the weather is cold, the battery cells need to be heated to keep the temperature in the battery within the required temperature range.

[0073] In the related art, in order to make the battery cells operate in the appropriate temperature range, a heat exchange member and a phase change material member are arranged in the box of the battery. The heat exchange member is arranged at the bottom of the battery cell, and the phase change material member is arranged on the side of the battery cell after being bent multiple times and is inserted between multiple battery cells. Since the side wall and the bottom of all battery cells are heat exchange surfaces, they are used to exchange heat with the phase change material member and the heat exchange member, respectively. The heat exchanged by each battery cell is approximately the same, but for the battery cells on the periphery of the battery assembly, due to heat exchange with the environment, the temperature difference between the battery cells on the periphery and the battery cells in the middle of the battery assembly is large, and the temperature uniformity of the battery assembly is poor.

[0074] In order to reduce the heat loss of the battery cells on the periphery, in the related art, a thermal insulation pad is arranged at both ends of the battery assembly, and the thermal insulation pad abuts against the box. Since the battery cells are separated from the beams of the box only by the thermal insulation pad, the distance between the battery cells and the beams of the box is too close, the thermal insulation pad cannot effectively insulate heat, and the heat dissipation of the battery cells on the periphery is still too fast, the temperature difference between the battery cells on the periphery and the battery cells in the middle is large, and the temperature distribution of the battery assembly is uneven.

[0075] Based on the above considerations, in order to solve the problem that the battery cells at the ends of the battery assembly are close to the beams of the box and dissipate more heat, and the overall temperature difference of the battery assembly is too large, and to improve the temperature uniformity of the battery assembly, the present application proposes a battery. A phase change material member is arranged on the periphery of the battery assembly. The phase change material member can store or release heat when the heat management member exchanges heat with the battery assembly, slow down the temperature change speed of the battery cells on the periphery of the battery assembly, make the temperature change speed of each part of the battery assembly consistent, and when the heat management member stops exchanging heat with the battery assembly, the phase change material member can keep the temperature of the battery cells on the periphery of the battery assembly, so that the heat dissipation speed of the battery cells on the periphery is consistent with that of the remaining battery cells, thereby improving the temperature uniformity of the battery assembly and prolonging the service life of the battery.

[0076] The embodiments of the present application provide a power consumption device using the battery cell as a power supply. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, and the like. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0077] The following embodiments take the power consumption device 1 as a vehicle as an example for convenient description, and introduce the structure of the power consumption device 1 and the battery 100 in detail.

[0078] Please refer to FIG. 1, which is a structural schematic diagram of the power consumption device 1 as a vehicle according to some embodiments of the present application. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile. The new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile. The vehicle is provided with a battery 100, which can be arranged at the bottom, the head, or the tail of the vehicle. The battery 100 can be used for power supply of the vehicle, for example, the battery 100 can be used as an operating power supply of the vehicle. The vehicle can further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle during starting, navigation, and driving. In some embodiments of the present application, the battery 100 can be used as not only an operating power supply of the vehicle, but also a driving power supply of the vehicle, to replace or partially replace fuel or natural gas to provide driving power for the vehicle.

[0079] Please refer to FIG. 2, which is an exploded view of the battery 100 according to some embodiments of the present application. The battery 100 includes a box body 10 and a plurality of battery cells 211, and the battery cells 211 are accommodated in the box body 10. The box body 10 is used to provide an assembly space for the battery cells 211, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first box body 10 and a second box body 10. The first box body 10 and the second box body 10 are overlapped with each other, and the first box body 10 and the second box body 10 jointly define an assembly space for accommodating the battery cells 211. The second box body 10 can be a hollow structure with one end open, and the first box body 10 can be a plate-shaped structure. The first box body 10 is overlapped with the open side of the second box body 10, so that the first box body 10 and the second box body 10 jointly define the assembly space. Alternatively, the first box body 10 and the second box body 10 can also be hollow structures with one side open (for example, as shown in FIG. 2). The open side of the first box body 10 is overlapped with the open side of the second box body 10. Of course, the box body 10 formed by the first box body 10 and the second box body 10 can have various shapes, such as a cylinder or a cuboid.

[0080] In the battery 100, the plurality of battery cells 211 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the plurality of battery cells 211 are connected in series and in parallel. The plurality of battery cells 211 can be directly connected in series, in parallel, or in a mixed manner, and the whole of the plurality of battery cells 211 is accommodated in the case 10. Alternatively, the battery 100 can be in a form in which the plurality of battery cells 211 are connected in series, in parallel, or in a mixed manner to form a battery 100 module, and the plurality of battery 100 modules are connected in series, in parallel, or in a mixed manner to form a whole, and the whole is accommodated in the case 10. The battery 100 can further include other structures. For example, the battery 100 can further include a busbar member for electrically connecting the plurality of battery cells 211.

[0081] The battery 100 according to the first aspect of the present application is described below with reference to FIGS. 3-9. FIG. 3 is an exploded view of the battery 100 according to an embodiment of the present application without an upper cover; FIG. 4 is an enlarged view of a portion indicated by circle A in FIG. 3; FIG. 5 is a schematic view of the partition beam 1112, the battery assembly 20, the phase change material 40, and the plurality of first heat exchange members 31 of the battery 100 according to an embodiment of the present application; FIG. 6 is a top view of the partition beam 1112, the battery assembly 20, the phase change material 40, and the first heat exchange member 31 shown in FIG. 5; FIG. 7 is a sectional view along line B-B in FIG. 6; FIG. 8 is an enlarged view of a portion indicated by circle C in FIG. 7; and FIG. 9 is a schematic view of the partition beam 1112, the battery assembly 20, the phase change material 40, the plurality of first heat exchange members 31, and the second heat exchange member 32 of the battery 100 according to an embodiment of the present application.

[0082] For convenience of description, the length direction of the battery 100 is defined as a first direction Y, the width direction of the battery 100 is defined as a second direction X, and the thickness direction of the battery 100 is defined as a third direction Z. In one specific example, the length direction of the battery 100 is the left-right direction, the width direction of the battery 100 is the front-rear direction, and the thickness direction of the battery 100 is the up-down direction.

[0083] The battery 100 according to an embodiment of the present application includes a case 10, a battery assembly 20, a thermal management member 30, and a phase change material 40. The case 10 has an accommodation cavity 101. The battery assembly 20 is arranged in the accommodation cavity 101. The thermal management member 30 is configured to heat and cool the battery assembly 20. The thermal management member 30 can include a second heat exchange member 32 arranged between the battery assembly 20 and the top wall and / or the bottom wall of the accommodation cavity 101. The phase change material 40 extends along the circumferential direction of the battery assembly 20 and is arranged on the circumferential side of the battery assembly 20 to exchange heat with the battery cells 211 on the circumferential side of the battery assembly 20.

[0084] As shown in FIG. 2, the box 10 includes a first part 11 and a second part 12, the first part 11 defines an accommodating cavity 101 open at the upper side, the second part 12 is a plate body shape and covers the upper side of the first part 11, and the first part 11 and the second part 12 can be connected by clamping or fasteners.

[0085] The battery 100 further includes a bottom guard plate 50 arranged at the lower side of the first part 11 for protecting the box 10, reducing and buffering the force of the object impacting the box 10 at the lower side of the battery 100, improving the structural strength of the box 10, and protecting the box 10 and the thermal management member 30 arranged at the bottom of the first part 11.

[0086] As shown in FIG. 3, the battery assembly 20 can include a plurality of battery monomers 211 arranged in sequence along the first direction Y and / or the second direction X.

[0087] The thermal management member 30 is an active thermal management member 30, which can be used for heating or cooling the battery assembly 20 to make the battery assembly 20 operate in a suitable temperature range and improve the performance of the battery 100. The thermal management member 30 can be a heat exchange plate or a heat exchange pipe 321 with a heat exchange flow channel, or a heating pad with a heating function. The thermal management member 30 can be arranged at the bottom and / or top of the battery assembly 20 and / or between the battery monomers 211.

[0088] The second heat exchange member 32 can be a heat exchange plate, specifically, the second heat exchange member 32 is formed in a horizontally arranged rectangular plate body shape, one side surface of the second heat exchange member 32 in the thickness direction is attached to the battery assembly 20 for heat exchange with the battery assembly 20. The second heat exchange member 32 can form a second heat exchange flow channel therein, which can extend in a straight line or in a meandering manner. The second heat exchange member 32 can also include a heat exchange pipe 321, which defines a second heat exchange flow channel therein, and the heat exchange pipe 321 can be a flat tube.

[0089] The second heat exchange member 32 can be arranged between the bottom wall of the accommodating cavity 101 and the bottom surface of the battery assembly 20, or between the bottom wall of the accommodating cavity 101 and the top surface of the battery assembly 20, or between the top wall of the accommodating cavity 101 and the top surface of the battery assembly 20, and between the bottom wall of the accommodating cavity 101 and the bottom surface of the battery assembly 20. In addition, the second heat exchange member 32 can be arranged inside the box 10 or outside the box 10, for example, the first part 11 of the box 10 can be an integrally formed metal plate, and the second heat exchange member 32 can be arranged outside the box 10 and attached to the bottom wall of the box 10, and the second heat exchange member 32 exchanges heat with the battery assembly 20 through the bottom wall of the box 10.

[0090] The phase change material piece 40 comprises a phase change material 42 which changes state at a phase change temperature to absorb or release latent heat, and specifically, the phase change material 42 can change from solid to liquid or from gas to liquid. The phase change material piece 40 is arranged at the peripheral side of the battery assembly 20, which means that, in the horizontal projection plane, the phase change material piece 40 is located outside the projection of the battery assembly 20 and does not lie within the projection of the battery assembly 20. The phase change material piece 40 can exchange heat with the side walls of the battery cells 211 arranged at the peripheral side of the battery assembly 20, i.e. the phase change material piece 40 exchanges heat with the peripheral side walls of the battery assembly 20.

[0091] When the thermal management piece 30 is used to actively manage the temperature of the battery assembly 20, the thermal management piece 30 directly exchanges heat with the plurality of battery cells 211 of the battery assembly 20. Hereinafter, the case where the thermal management piece 30 is arranged at the bottom of the battery assembly 20 and is used to heat the battery assembly 20 in a low-temperature working condition is taken as an example for description, and it is obvious for those skilled in the art to understand the case where the thermal management piece 30 is arranged at the bottom wall of the battery assembly 20 and is used to cool the battery assembly 20 after reading the following technical solutions.

[0092] When the thermal management piece 30 heats the battery assembly 20, since the phase change material piece 40 is arranged at the peripheral side of the battery assembly 20, the thermal management piece 30 can directly heat the phase change material piece 40 or indirectly heat the phase change material piece 40 through the heat conduction of the box 10, so that the phase change material piece 40 can absorb and store a large amount of heat. Since the phase change material piece 40 is arranged at the peripheral side of the battery assembly 20, the phase change material piece 40 can play a heat preservation role at the peripheral side of the battery assembly 20, reduce the heat dissipation of the battery assembly 20 to the environment, and make the temperature of the battery cells 211 at the peripheral side of the battery assembly 20 more consistent with the temperature of the battery cells 211 at other positions.

[0093] In addition, when the thermal management piece 30 starts to heat the battery assembly 20, the thermal management piece 30 will heat the beams of the box 10 due to the contact with the beams. Since the beams of the box 10 are usually metal pieces, the heat conduction is good but the heat melting is low. At the beginning of heating, the beams of the box 10 will quickly heat up and reach thermal equilibrium. At this time, since the phase change material piece 40 is arranged at the peripheral side of the battery assembly 20, the phase change material piece 40 can absorb a large amount of heat of the beams of the box 10, reduce the heat transfer of the beams of the box 10 to the battery cells 211 at the peripheral side of the battery assembly 20, reduce the heating rate of the battery cells 211 at the peripheral side of the battery assembly 20, make the heating rate of the battery cells 211 at the peripheral side of the battery assembly 20 consistent with the heating rate of the battery cells 211 at other positions, and improve the temperature uniformity of the battery 100.

[0094] Hereinafter, the battery 100 of the embodiment of the present application is described by taking the case where the thermal management piece 30 is arranged between adjacent battery cells 211 and at the peripheral side of the battery assembly 20 and is used to heat the battery assembly 20 in a low-temperature working condition as an example.

[0095] When the thermal management member 30 heats the battery assembly 20, for the battery monomers 211 on the circumferential side of the battery assembly 20, because the thermal management member 30 is arranged on the circumferential side of the battery assembly 20, compared with the thermal management member 30 arranged between the adjacent battery monomers 211, the thermal management member 30 on the circumferential side only heats the battery monomers 211 on the circumferential side, without simultaneously heating the battery monomers 211 on the two sides, therefore, when the circumferential side of the battery assembly 20 is not provided with the phase change material member 40, the temperature rising speed of the battery monomers 211 on the circumferential side of the battery assembly 20 will be faster, affecting the temperature uniformity of the battery assembly 20.

[0096] Because the embodiment is provided with the phase change material member 40 on the circumferential side of the battery assembly 20, the phase change material member 40 can absorb the heat of the thermal management member 30 on the circumferential side of the battery assembly 20, so as to reduce the temperature rising speed of the battery monomers 211 on the circumferential side of the battery assembly 20, and make the temperature rising speed of the battery monomers 211 on the circumferential side consistent with that of the remaining battery monomers 211.

[0097] When the thermal management member 30 stops heating, because the phase change material member 40 stores heat, it can continuously release heat to the battery monomers 211 on the circumferential side, actively keeping warm for the battery monomers 211 on the circumferential side, so as to reduce the heat dissipation speed of the battery monomers 211 on the circumferential side, and make the temperature of the battery monomers 211 on the circumferential side consistent with that of the remaining battery monomers 211, improving the temperature uniformity of the battery assembly 20.

[0098] In the above technical solution, because the phase change material member 40 is arranged on the circumferential side of the battery assembly 20, the phase change material member 40 can store or release heat when the thermal management member 30 exchanges heat with the battery assembly 20, slow down the temperature change speed of the battery monomers 211 on the circumferential side of the battery assembly 20, make the temperature change speed of each part of the battery assembly 20 consistent, when the thermal management member 30 stops exchanging heat with the battery assembly 20, the phase change material member 40 can keep warm for the battery monomers 211 on the circumferential side of the battery assembly 20, make the heat dissipation speed of the battery monomers 211 on the circumferential side consistent with that of the remaining battery monomers 211, and further improve the temperature uniformity of the battery assembly 20, and improve the service life of the battery 100.

[0099] In some embodiments of the present application, as shown in FIGS. 3 and 4, the phase change material member 40 is arranged between the battery assembly 20 and the side wall of the accommodating cavity 101.

[0100] For example, the phase change material piece 40 is in a plate body shape arranged along the vertical direction and extending along the circumference of the battery assembly 20, and is arranged between the circumferential side surface of the battery assembly 20 and the side wall surface of the accommodating cavity 101. The side surface of the phase change material piece 40 facing the battery assembly 20 can be directly attached to the surface of the battery monomer 211 of the battery assembly 20, or the side surface of the phase change material piece 40 facing the battery assembly 20 can be indirectly connected to the surface of the battery assembly 20 through the heat management piece 30.

[0101] The phase change material piece 40 can extend along the circumference of the battery assembly 20 to be annular, or a plurality of phase change material pieces 40 can be arranged in sequence along the circumference of the battery assembly 20 to further improve the temperature uniformity of the battery assembly 20.

[0102] In the above technical solution, by arranging the phase change material piece 40 between the battery assembly 20 and the side wall of the accommodating cavity 101, the phase change material piece 40 can be conveniently arranged and contacted with the battery assembly 20 for heat exchange. The phase change material piece 40 can also be arranged as a buffer structure between the battery assembly 20 and the side wall of the accommodating cavity 101 to reduce the probability of impact between the battery assembly 20 and the side wall of the accommodating cavity 101 and improve the safety performance of the battery assembly 20.

[0103] In some embodiments of the present application, as shown in FIGS. 7 and 8, the phase change material piece 40 can include an outer shell 41 and a phase change material 42, and the outer shell 41 defines a cavity 401, and the phase change material 42 is filled in the cavity 401.

[0104] The outer shell 41 can provide a space for containing the phase change material 42 to reduce the probability of leakage of the phase change material 42. Since the phase change material piece 40 is arranged in the box body 10, in order to improve the insulation performance of the phase change material piece 40, the outer shell 41 can be arranged as an insulation material piece.

[0105] In the above technical solution, the phase change material piece 40 includes an outer shell 41 and a phase change material 42 filled in the outer shell 41, and the outer shell 41 can provide a space for containing the phase change material 42, thereby simplifying the structure of the phase change material 42 and reducing the cost of the phase change material piece 40.

[0106] In some embodiments of the present application, the outer shell 41 includes a metal layer and an insulation film layer arranged on both side surfaces of the metal layer in the thickness direction.

[0107] For example, the shell 41 can include one metal layer and two insulating film layers, the two insulating film layers respectively completely covering two side surfaces of the metal layer in the thickness direction, the metal layer can improve the structural strength of the shell 41, reduce the probability of rupture of the shell 41 when the phase change material 42 changes state, and reduce the probability of leakage of the phase change material, and the insulating film layer can insulate the phase change material piece 40 from the box body 10 and the battery assembly 20, and reduce the probability of short circuit between the phase change material piece 40 and the battery assembly 20.

[0108] In one specific example, the shell 41 can be an aluminum-plastic film shell 41.

[0109] In the above technical solution, since the shell 41 includes a metal layer and insulating film layers arranged on both sides of the metal layer in the thickness direction, the structural strength of the shell can be improved, the probability of leakage of the phase change material 42 can be reduced, and the insulation performance of the phase change material piece 40 can also be improved.

[0110] In some embodiments of the present application, as shown in FIG. 8, the shell 41 can include a first half shell 411 and a second half shell 412, the first half shell 411 and the second half shell 412 are arranged in the thickness direction of the phase change material piece 40, the periphery of the first half shell 411 and the periphery of the second half shell 412 are sealingly attached in the thickness direction of the shell 41, and cooperatively define a cavity 401.

[0111] For example, the first half shell 411 is formed with a first concave cavity recessed away from the second half shell 412, the second half shell 412 is formed with a second concave cavity recessed away from the first half shell 411, and the first half shell 411 and the second half shell 412 are connected through the periphery of the first concave cavity and the periphery of the second concave cavity.

[0112] In the above technical solution, the cavity 401 is formed by connecting the periphery of the first half shell 411 and the periphery of the second half shell 412, which can further simplify the structure of the shell 41 and facilitate processing and manufacturing.

[0113] In some embodiments of the present application, the phase change material piece 40 can include a phase change material 42, and the phase change material 42 is configured to change from a solid phase to a liquid phase within a preset working temperature range of the battery assembly 20.

[0114] In the above technical solution, the phase change material 42 can have a high latent heat of fusion, and the latent heat of fusion of the phase change material 42 is higher than the latent heat of fusion of the battery monomer 211. In this way, when the phase change material 42 changes phase, it can absorb or release a large amount of latent heat, stabilize the temperature change speed of the battery monomer 211 around the battery assembly 20, and improve the uniform temperature performance of the battery 100.

[0115] In one specific example, the phase change material 42 is in a solid-liquid phase transition within a preset working temperature range of the battery assembly 20. For example, the phase change temperature of the phase change material 42 can be between 0°C and 20°C. In this way, the phase change material 42 can be in a phase transition within the preset working temperature range of the battery assembly 20, absorb or release a large amount of latent heat, so as to keep the battery assembly 20 in the preset working temperature range at all times, reduce the probability of the battery assembly 20 operating beyond the preset working temperature range, and improve the safety and stability of the battery assembly 20.

[0116] In one specific example, the preset working temperature range of the battery assembly 20 has an upper temperature limit and a lower temperature limit, the phase change temperature of the phase change material 42 is the upper temperature limit ± 5°C, and / or the phase change temperature of the phase change material 42 is the lower temperature limit ± 5°C. The phase change temperature of the phase change material 42 can not be a fixed temperature value, but also can be a temperature interval.

[0117] The solid-liquid phase transition of the phase change material 42 in the embodiment can reduce the volume change of the phase change material 42 when the state changes, reduce the pressure change in the phase change material piece 40, and reduce the probability of leakage of the phase change material 42.

[0118] In the above technical solution, by setting the phase change material 42 to be in a solid-liquid phase transition within a preset working temperature range, the volume change of the phase change material 42 when the state changes can be reduced, the pressure change in the phase change material piece 40 can be reduced, the probability of leakage of the phase change material 42 can be reduced, the battery assembly 20 can be kept in the preset working temperature range at all times, the probability of the battery assembly 20 operating beyond the preset working temperature range can be reduced, and the safety and stability of the battery assembly 20 can be improved.

[0119] In some embodiments of the present application, the phase change material 42 is paraffin or a supersaturated salt solution.

[0120] For example, the phase change material 42 can be paraffin, which has a large latent heat of phase change, a small volume change in the solid-liquid phase transition process, good thermal stability, no supercooling phenomenon, and a relatively low price. In this way, the cost of the phase change material piece 40 can be reduced while meeting the phase change heat absorption or heat release. For another example, the phase change material 42 can also be a supersaturated sodium sulfate solution or a supersaturated sodium acetate solution.

[0121] In the above technical solution, by setting the phase change material 42 to be paraffin or a supersaturated salt solution, the cost of the phase change material piece 40 can be reduced.

[0122] In some embodiments of the present application, the phase change material piece 40 can further include an adsorption member configured to be suitable for adsorbing the liquid phase change material 42.

[0123] For example, the suction accessory can be filled in the shell of the phase change material piece 40, and when the phase change material 42 is melted, the suction accessory can suck the liquid phase change material 42, so that the liquid phase change material 42 can be uniformly distributed in the shell instead of being gathered at the bottom of the shell under the action of gravity, thereby improving the temperature uniformity of the phase change material piece 40 in the up-down direction.

[0124] In the technical solution, the suction accessory is arranged to suck the liquid phase change material 42, so that the liquid phase change material 42 can be uniformly distributed in the phase change material piece 40, and the temperature uniformity of the phase change material piece 40 at different positions can be improved.

[0125] In some embodiments of the present application, the suction accessory is a porous material piece.

[0126] The porous material piece is a material piece with mutually penetrating or closed pores. The porous material piece has good adsorption performance and can effectively adsorb the liquid phase change material 42.

[0127] For example, the suction accessory can be a sponge piece, a cotton piece, or the like; or the suction accessory can be a graphite material piece.

[0128] In the technical solution, the suction accessory is a porous material piece, so that the adsorption performance of the suction accessory to the liquid phase change material 42 can be improved, and the temperature uniformity of the phase change material piece 40 at different positions can be improved.

[0129] In some embodiments of the present application, the box body 10 includes a beam body 111, the beam body 111 encloses the accommodating cavity 101, the beam body 111 has a cavity 1101 therein, and the phase change material piece 40 is arranged in at least part of the cavity 1101.

[0130] The cavities 1101 of the beam body 111 can each be provided with the phase change material piece 40, or only part of the cavities 1101 can be provided with the phase change material piece 40. Arranging the phase change material piece 40 in the cavity 1101 in the beam body can reduce the space occupied by the phase change material 42 in the box body 10, and improve the energy density of the battery 100.

[0131] In one specific example, the box 10 includes a first part 11 and a second part 12, the first part 11 forms a top-open accommodating cavity 101, the second part 12 is arranged on the upper side of the first part 11, the first part 11 includes a beam body 111 and a bottom plate 112, the bottom plate 112 is connected to the bottom of the beam body 111, the beam body 111 includes a frame beam 1111 and a partition beam 1112, the frame beam 1111 is a rectangular ring, the bottom plate 112 covers the bottom of the frame beam 1111, the partition beam 1112 is arranged on the inner side of the frame beam 1111, the partition beam 1112 can extend along the width direction of the frame beam 1111, and the two ends extend to the opposite sides of the frame beam 1111 respectively and are fixed with the frame beam 1111, the number of the partition beam 1112 can be one or more, when the partition beam 1112 is multiple, the multiple partition beams 1112 are arranged at intervals along the length direction of the frame beam 1111. Specifically, the beam body 111 includes the frame beam 1111 and two partition beams 1112, and the battery assembly 20 is arranged between the two partition beams 1112.

[0132] In the above technical solution, by arranging the phase change material piece 40 in the cavity 1101 of the beam body 111, the phase change material piece 40 can exchange heat with the battery monomer 211 on the peripheral side of the battery assembly 20 through the beam body 111, thereby improving the temperature uniformity of the battery 100, and at the same time, the phase change material piece 40 does not need to occupy the space inside the box 10, so that the structure can be compact and the energy density of the battery 100 can be improved.

[0133] In the above technical solution, by arranging the phase change material piece 40 in the cavity 1101 of the beam body 111, the phase change material piece 40 can exchange heat with the battery monomer 211 on the peripheral side of the battery assembly 20 through the beam body 111, thereby improving the temperature uniformity of the battery 100, and at the same time, the phase change material piece 40 does not need to occupy the space inside the box 10, so that the structure can be compact and the energy density of the battery 100 can be improved.

[0134] In some embodiments of the present application, the number of phase change material pieces 40 is multiple, and the multiple phase change material pieces 40 are arranged at intervals along the circumferential direction of the battery assembly 20.

[0135] For example, the number of phase change material pieces 40 can be two, three, four, five, eight or ten or more, etc.

[0136] In the above technical solution, by arranging the phase change material piece 40 in the cavity 1101 of the beam body 111, the phase change material piece 40 can exchange heat with the battery monomer 211 on the peripheral side of the battery assembly 20 through the beam body 111, thereby improving the temperature uniformity of the battery 100, and at the same time, the phase change material piece 40 does not need to occupy the space inside the box 10, so that the structure can be compact and the energy density of the battery 100 can be improved.

[0137] In some embodiments of the present application, the battery assembly 20 comprises a plurality of monomer groups 21 arranged in sequence along a first direction Y, each monomer group 21 comprising a plurality of battery monomers 211 arranged in sequence along a second direction X, wherein the phase change material 40 is arranged on both sides of the battery assembly 20 in the first direction Y, and / or the phase change material 40 is arranged on both sides of the battery assembly 20 in the second direction X, the first direction Y being perpendicular to the second direction X.

[0138] That is, the phase change material 40 can be arranged on both sides of the battery assembly 20 in the first direction Y only, on both sides of the battery assembly 20 in the second direction X only, or on both sides of the battery assembly 20 in the first direction Y and on both sides of the battery assembly 20 in the second direction X.

[0139] For example, the battery assembly 20 is arranged in the frame beam 1111 and between two partition beams 1112, four phase change materials 40 can be arranged in the box 10, specifically, two phase change materials 40 are arranged on both sides of the battery assembly 20 in the first direction Y and between the partition beam 1112 and the battery assembly 20, respectively, and the other two phase change materials 40 are arranged on both sides of the battery assembly 20 in the second direction X and between the frame beam 1111 and the battery assembly 20, respectively. For another example, only two phase change materials 40 can be arranged, and the two phase change materials 40 are arranged between the two partition beams 1112 and the battery assembly 20, respectively.

[0140] When one side of the battery assembly 20 is provided with the phase change material 40, the phase change material 40 can extend from one end of the side of the battery assembly 20 to the other end, for example, when one side of the battery assembly 20 in the first direction Y is provided with the phase change material 40, the phase change material 40 extends along the second direction X and from one end of the battery assembly 20 in the second direction X to the other end, further, the two ends of the phase change material 40 can be substantially flush with the two ends of the battery assembly 20 in the second direction X. In other examples, a plurality of phase change materials 40 can also be arranged between one side of the battery assembly 20 and the side wall of the accommodating cavity 101, the plurality of phase change materials 40 can be arranged in sequence along the length direction of one side of the battery assembly 20, or arranged in sequence along the height direction of the battery assembly 20.

[0141] In the above technical solutions, by arranging the phase change material 40 on both sides of the battery assembly 20 in the first direction Y and / or the second direction X, the phase change material 40 can exchange heat with more battery monomers 211 on the side of the battery assembly 20, further improving the uniform temperature performance of the battery 100.

[0142] In some embodiments of the present application, as shown in FIGS. 5-8, the heat management member 30 comprises: a first heat exchange member 31 extending along the second direction X, the first heat exchange member 31 being arranged between the two adjacent single groups 21 and on both sides of the battery assembly 20 in the first direction Y, and the phase change material member 40 being arranged between the side wall of the accommodating cavity 101 and the first heat exchange member 31.

[0143] The first heat exchange member 31 can be a heat exchange plate, specifically, the first heat exchange member 31 is formed in a vertical rectangular plate body shape, at least one side surface of the first heat exchange member 31 in the thickness direction is attached to the single group 21 to exchange heat with the single group 21, and the inner side of the first heat exchange member 31 can be formed with a first heat exchange flow channel, which can extend in a straight line or in a meandering manner. The first heat exchange member 31 can also be a heat exchange flat tube, and the first heat exchange flow channel is defined in the heat exchange flat tube.

[0144] The first heat exchange member 31 can also be formed with a first liquid inlet connector and a first liquid outlet connector communicating with the first heat exchange flow channel, the first liquid inlet connector and the first liquid outlet connector are arranged at both ends of the first heat exchange member 31 in the second direction X, respectively, the first liquid inlet connectors of the plurality of first heat exchange members 31 are connected in sequence along the first direction Y, and the first liquid outlet connectors of the plurality of first heat exchange members 31 are connected in sequence along the first direction Y. At this time, the first heat exchange flow channels of the plurality of first heat exchange members 31 are arranged in parallel.

[0145] Among them, for the first heat exchange member 31 arranged between the two adjacent single groups 21, the two side surfaces of the first heat exchange member 31 in the thickness direction are attached to the two single groups 21 respectively to exchange heat; arranging the first heat exchange member 31 between the adjacent single groups 21 can increase the heat exchange area of the plurality of first heat exchange members 31 and the battery assembly 20, and improve the heat exchange efficiency.

[0146] For the two first heat exchange members 31 arranged on both sides of the single group 21 in the first direction Y, one side surface of the first heat exchange member 31 is attached to the single group 21 to exchange heat, and the other side surface of the first heat exchange member 31 is attached to the phase change material member 40 to exchange heat. Here, the single group 21 arranged towards the phase change material member 40 is defined as the first single group 21a.

[0147] It should be noted that when the first heat exchange member 31 and the side wall of the containing cavity 101 are not provided with the phase change material member 40, for example, the first heat exchange member 31 and the side wall of the containing cavity 101 are provided with a thermal insulation pad, when the plurality of first heat exchange members 31 heat the battery assembly 20, for the first heat exchange member 31 arranged adjacent to the thermal insulation pad, the first heat exchange member 31 only heats the first monomer group 21a, and the remaining first heat exchange members 31 heat the monomer groups 21 on both sides, respectively. The heating speed of the first monomer group 21a is fast, and the temperature of the first monomer group 21a rises relatively fast, so the temperature of the first monomer group 21a is higher than that of the remaining monomer groups 21, and the temperature rises relatively fast.

[0148] And the embodiment is provided with the phase change material member 40 between the first heat exchange member 31 and the side wall of the containing cavity 101, which can isolate the first heat exchange member 31 from the side wall of the containing cavity 101, and reduce the heat loss of the first heat exchange member 31 and the first monomer group 21a.

[0149] At the same time, when the plurality of first heat exchange members 31 heat the battery assembly 20, the phase change material member 40 can synchronously absorb heat, and due to the high heat melting of the phase change material member 40, the heat absorption can continue until the heat saturation state, at this time, the first heat exchange member 31 arranged between the phase change material member 40 and the first monomer group 21a can heat the phase change material member 40 and the first monomer group 21a at the same time, so as to reduce the temperature rising speed of the first monomer group 21a, keep the temperature of the battery monomer 211 of the first monomer group 21a not too high, and keep it in a suitable temperature range, and reduce the temperature difference with the remaining monomer groups 21.

[0150] When the plurality of first heat exchange members 31 stop heating, due to the high latent heat of the heated phase change material member 40, the heat release can continue, the active heat preservation effect on the first monomer group 21a is realized, the heat dissipation speed of the first monomer group 21a is reduced, the temperature difference between the first monomer group 21a and the remaining monomer groups 21 is reduced, and the temperature uniformity of the battery 100 is improved.

[0151] In the above technical solution, since the plurality of first heat exchange members 31 are arranged between the adjacent monomer groups 21, and the phase change material member 40 is arranged between the side wall of the containing cavity 101 and the first heat exchange member 31, when the first heat exchange member 31 heats the battery assembly 20, the phase change material member 40 can absorb the heat of the first heat exchange member 31, and reduce the temperature rising speed of the monomer group 21 on the side of the battery assembly 20, when the first heat exchange member 31 stops heating, the phase change material member 40 can release heat, and reduce the heat dissipation speed of the monomer group 21 on the side of the battery assembly 20, thereby reducing the temperature difference between the monomer group 21 on the side of the battery assembly 20 and the remaining monomer groups 21, and improving the temperature uniformity of the battery assembly 20.

[0152] In some embodiments of the present application, as shown in FIG. 9, the phase change material piece 40 is arranged on both sides of the battery assembly 20 in the first direction Y.

[0153] The phase change material piece 40 is two, and the two phase change material pieces 40 are arranged on both sides of the battery assembly 20 in the left-right direction, respectively, and the phase change material piece 40 is vertically arranged, and one side surface in the left-right direction is attached to the first monomer group 21a, and the other side surface is attached to the beam body 111 of the box body 10.

[0154] In the above technical solution, by arranging the second heat exchange piece 32 on the top and bottom of the battery assembly 20, the second heat exchange piece 32 can simultaneously exchange heat with multiple monomer groups 21, while ensuring the heat exchange efficiency, reducing the space occupation, and facilitating the assembly of the second heat exchange piece 32. Since the phase change material piece 40 is arranged on both sides of the battery assembly 20, the phase change material piece 40 can directly or indirectly exchange heat with the second heat exchange piece 32 through the box body 10, absorb the heat of the second heat exchange piece 32, and reduce the heating and cooling speed of the battery monomer 211 on the side of the battery assembly 20, and improve the uniform temperature performance of the battery assembly 20.

[0155] In some embodiments of the present application, the second heat exchange piece 32 can include a heat exchange pipe 321, and the heat exchange pipe 321 reciprocally extends in the first direction Y, and the two ends of the heat exchange pipe 321 in the first direction Y respectively extend to the side of the phase change material piece 40 away from the battery assembly 20.

[0156] That is, when the phase change material piece 40 and the battery assembly 20 are taken as a whole structure, the two ends of the heat exchange pipe 321 in the first direction Y respectively exceed the two ends of the whole structure.

[0157] The second heat exchange piece 32 can include one, two, three or more heat exchange pipes 321, and each heat exchange pipe 321 can include a plurality of straight pipe segments 3211, the plurality of straight pipe segments 3211 extend along the first direction Y and are arranged at intervals along the second direction X, the plurality of straight pipe segments 3211 are sequentially connected along the second direction X, and the two adjacent straight pipe segments 3211 are connected through a bending segment 3212, the bending angle of the bending segment 3212 is 180 degrees, and further, the bending segment 3212 extends along a circular arc line protruding away from the straight pipe segment 3211. Among them, at least part of the bending segment 3212 is located on the side of the phase change material piece 40 away from the battery assembly 20. Thus, the uniformity of the heating of the second heat exchange piece 32 to the multiple batteries 100 of the battery assembly 20 can be improved, and the uniform temperature performance is improved.

[0158] When the second heat exchange member 32 is arranged at the top or bottom of the battery assembly 20 in the box 10, in order to facilitate the connection of the heat exchange pipe 321 with the current collector or external circulation pipeline, the water inlet end and the water outlet end of the heat exchange pipe 321 need to pass through the beam body 111 to connect the current collector or external pipeline. Among them, the beam body 111 of the box 10 is generally a metal material piece, and the heat transfer effect is good, but the thermal melting is low. Among the plurality of single groups 21, the single group 21 located at the side of the battery assembly 20 and arranged towards the water inlet end and the water outlet end of the heat exchange pipe 321 is the first single group 21a.

[0159] When the second heat exchange member 32 is used to heat the battery assembly 20, the heat exchange fluid enters the straight pipe section 3211 and the bending section 3212 through the water inlet end of the heat exchange pipe 321, and exchanges heat with the battery assembly 20. Among them, since the water inlet end of the heat exchange pipe 321 passes through the beam body 111 of the box 10, the heat of the heat exchange fluid in the water inlet end of the heat exchange pipe 321 can be transmitted to the beam body 111 through the pipe wall of the heat exchange pipe 321, and the beam body 111 is heated. Since the thermal melting of the beam body 111 is low, the temperature rising rate is fast, and therefore the beam body 111 quickly reaches thermal equilibrium.

[0160] When the beam body 111 and the first single group 21a are not provided with the phase change material piece 40, since the temperature of the beam body 111 is high, the beam body 111 will transmit heat to the battery monomer 211 in the first single group 21a. Therefore, for the battery monomer 211 of the first single group 21a, not only is it subjected to the heating action of the second heat exchange member 32 at the bottom or top, but also is subjected to the heating action of the beam body 111. At this time, the temperature rising speed of the battery monomer 211 of the first single group 21a is faster, and the temperature difference with the battery monomer 211 of the remaining single groups 21 is large.

[0161] However, the phase change material piece 40 is arranged between the first single group 21a and the beam body 111 or in the beam body 111. The phase change material piece 40 can absorb the heat of the beam body 111, slow down the temperature rising speed of the beam body 111, reduce the heating action of the beam body 111 on the battery monomer 211 of the first single group 21a, and reduce the temperature difference between the battery monomer 211 of the first single group 21a and the battery monomer 211 of the remaining single groups 21. When the second heat exchange member 32 stops heating, the phase change material piece 40 can play a role of heat preservation, reduce the heat dissipation rate of the first single group 21a, reduce the temperature between the first single group 21a and the remaining single groups 21, and improve the uniformity of the temperature.

[0162] In addition, the heat exchange pipe 321 extends to the side of the phase change material piece 40 away from the battery assembly 20, so that the phase change material piece 40 is located above the heat exchange pipe 321. In this way, the phase change material piece 40 can be in direct contact with the heat exchange pipe 321 for heat exchange, store heat, and play a role of heat insulation when the second heat exchange member 32 stops heating.

[0163] In the technical solution, the second heat exchange member 32 comprises the reciprocally extending heat exchange pipe 321, and the two ends of the heat exchange pipe 321 extend beyond the phase change heat exchange member. When heating, the heat exchange pipe 321 can heat the phase change material member 40 and the battery monomer 211 synchronously. After stopping heating, the phase change material member 40 can keep the monomer group 21 on the periphery of the battery assembly 20 warm, and improve the temperature uniformity of the battery assembly 20.

[0164] In a second aspect, the embodiments of the present application further provide a power utilization device 1 comprising the battery 100 of any of the above embodiments.

[0165] In the technical solution, the power utilization device 1 is provided with the battery 100, and the phase change material member 40 is arranged on the periphery of the battery assembly 20. When the heat management member 30 exchanges heat with the battery assembly 20, the phase change material member 40 can store or release heat, slow down the temperature change speed of the battery monomer 211 on the periphery of the battery assembly 20, and make the temperature change speeds of different parts of the battery assembly 20 consistent. When the heat management member 30 stops exchanging heat with the battery assembly 20, the phase change material member 40 can keep the battery monomer 211 on the periphery of the battery assembly 20 warm, make the heat dissipation speed of the battery monomer 211 on the periphery consistent with that of the remaining battery monomers 211, improve the temperature uniformity of the battery assembly 20, improve the service life of the battery 100, and thus improve the overall performance of the power utilization device 1.

[0166] Hereinafter, the battery 100 according to one specific embodiment of the present application will be described with reference to FIGS. 2-9.

[0167] Referring to FIG. 1, the battery 100 comprises a box body 10, a battery assembly 20, a heat management member 30, a phase change material member 40, and a bottom guard plate 50.

[0168] Specifically, as shown in FIG. 1, the box body 10 comprises a first part 11 and a second part 12. The first part 11 defines an accommodating cavity 101 which is open on the upper side. The second part 12 is in the shape of a plate body and covers the upper side of the first part 11. The first part 11 and the second part 12 cooperatively define the accommodating cavity 101.

[0169] The first part 11 comprises a beam body 111 and a bottom plate 112. The beam body 111 comprises a frame beam 1111 and a partition beam 1112. The frame beam 1111 is in the shape of a rectangular ring. The bottom plate 112 is connected to the bottom of the beam body 111 and covers the bottom of the frame beam 1111. The partition beam 1112 is arranged on the inner side of the frame beam 1111. The number of the partition beams 1112 is two. The two partition beams 1112 extend forward and backward and are arranged at intervals in the left-right direction.

[0170] The battery assembly 20, the thermal management member 30 and the phase change material member 40 are arranged on the upper side of the bottom plate 112 and between the two partition beams 1112. The bottom guard plate 50 is arranged on the lower side of the bottom plate 112 and fixed with the bottom plate 112. The battery assembly 20 comprises a plurality of single groups 21, each single group 21 comprising a plurality of battery monomers 211 arranged in sequence along the front-rear direction, and the plurality of single groups 21 are arranged in sequence along the left-right direction.

[0171] The thermal management member 30 comprises a first heat exchange member 31 and a second heat exchange member 32. The first heat exchange member 31 is in a plurality of cold plate structures arranged vertically and extending front-rear, and the plurality of first heat exchange members 31 are arranged alternately with the plurality of single groups 21 along the left-right direction, and the battery assembly 20 is provided with the first heat exchange member 31 on both sides in the left-right direction.

[0172] The second heat exchange member 32 is horizontally arranged at the bottom of the battery assembly 20 and comprises a heat exchange pipe 321. The heat exchange pipe 321 is a flat tube, which can comprise a plurality of straight pipe segments 3211 and a plurality of bending segments 3212. The plurality of straight pipe segments 3211 extend along the left-right direction and are arranged at intervals in the front-rear direction. The plurality of straight pipe segments 3211 are connected in sequence along the front-rear direction. The adjacent two straight pipe segments 3211 are connected through the bending segment 3212, and the bending angle of the bending segment 3212 is 180 degrees.

[0173] The phase change material member 40 is arranged between the partition beam 1112 and the first heat exchange member 31, or arranged in the cavity 1101 of the partition beam 1112. The phase change material member 40 comprises an outer shell 41, a phase change material 42 and a suction member. The outer shell 41 is an aluminum plastic film outer shell 41. The phase change material 42 and the suction member are arranged in the outer shell 41. The phase change material 42 is a solid-liquid phase change material 42, such as paraffin or a supersaturated salt solution, and is between solid and liquid states within a predetermined working temperature range of the battery assembly 20. The suction member is a graphite member or a cotton member, which is used to adsorb the liquid phase change material 42.

[0174] In the above technical solution, since the phase change material member 40 is arranged on both sides of the battery assembly 20, the phase change material member 40 can store or release heat when the thermal management member 30 exchanges heat with the battery assembly 20, slow down the temperature change speed of the battery monomers 211 on the sides of the battery assembly 20, and make the temperature change speeds of all parts of the battery assembly 20 consistent. When the thermal management member 30 stops exchanging heat with the battery assembly 20, the phase change material member 40 can keep the battery monomers 211 on the sides of the battery assembly 20 warm, so that the heat dissipation speed of the battery monomers 211 on the sides is consistent with that of the remaining battery monomers 211, thereby improving the temperature uniformity of the battery assembly 20 and prolonging the service life of the battery 100.

[0175] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery, comprising: a box body (10) having a receiving cavity (101); a battery assembly (20) arranged in the receiving cavity (101); a thermal management member (30) configured to heat and cool the battery assembly (20), the thermal management member (30) comprising: a second heat exchange member (32) arranged between the battery assembly (20) and a top wall and / or a bottom wall of the receiving cavity (101); a phase change material member (40) extending along a circumferential direction of the battery assembly (20) and arranged on a circumferential side of the battery assembly (20) to exchange heat with battery cells (211) on the circumferential side of the battery assembly (20).

2. The battery of claim 1, wherein, The phase change material member (40) is arranged between the battery assembly (20) and a side wall of the receiving cavity (101).

3. The battery of claim 2, wherein, The phase change material member (40) comprises an outer shell (41) and a phase change material (42), the outer shell (41) defining a cavity (401), and the phase change material (42) being filled in the cavity (401).

4. The battery of claim 3, wherein, The outer shell (41) comprises a metal layer and an insulating film layer arranged on both sides of the metal layer in a thickness direction.

5. The battery of claim 3 or 4, wherein, The outer shell (41) comprises a first half shell (411) and a second half shell (412) arranged in a thickness direction of the phase change material member (40), a circumferential edge of the first half shell (411) and a circumferential edge of the second half shell (412) being sealingly and tightly fitted in the thickness direction of the outer shell (41) and cooperatively defining the cavity (401).

6. The battery of any one of claims 1-5, wherein, The phase change material member (40) comprises a phase change material (42) configured to undergo a solid-liquid phase change within a preset working temperature range of the battery assembly (20).

7. The battery of claim 6, wherein, The phase change material (42) is paraffin or a supersaturated salt solution.

8. The battery of claim 6 or 7, wherein, The phase change material member (40) further comprises a suction member configured to be adapted to adsorb the phase change material (42) in a liquid state.

9. The battery of claim 8, wherein, The suction member is a porous material member.

10. The battery of any one of claims 1-9, wherein, The box body (10) comprises a beam body (111) enclosing the receiving cavity (101), the beam body (111) having a cavity (1101) therein, and the phase change material member (40) is arranged in at least part of the cavity (1101).

11. The battery of any one of claims 1-10, wherein, The number of the phase change material members (40) is plural, and the plural phase change material members (40) are arranged in a circumferential direction of the battery assembly (20) at intervals.

12. The battery of any one of claims 1-11, wherein, The battery assembly (20) comprises a plurality of cell groups (21) arranged in a first direction (Y) in sequence, and each cell group (21) comprises a plurality of battery cells (211) arranged in a second direction (X) in sequence. The phase change material piece (40) is arranged on opposite sides of the battery assembly (20) in a first direction (Y), and / or the phase change material piece (40) is arranged on opposite sides of the battery assembly (20) in a second direction (X), the first direction (Y) being perpendicular to the second direction (X).

13. The battery of claim 12, wherein, The heat management piece (30) comprises a first heat exchange piece (31) extending along the second direction (X), the first heat exchange piece (31) being arranged between adjacent two single cell groups (21) and on opposite sides of the battery assembly (20) in the first direction (Y), and the phase change material piece (40) being arranged between the side wall of the accommodating cavity (101) and the first heat exchange piece (31).

14. The battery of any one of claims 1-13, wherein, The phase change material piece (40) is arranged on opposite sides of the battery assembly (20) in a first direction (Y).

15. The battery of claim 14, wherein, The second heat exchange piece (32) comprises a heat exchange pipe (321) reciprocally extending in the first direction (Y), and two ends of the heat exchange pipe (321) in the first direction (Y) respectively extend to a side of the phase change material piece (40) away from the battery assembly (20).

16. An electric device comprising the battery (100) according to any one of claims 1-15.

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