Heat absorption and liquid supplement structure, battery, battery pack and electric equipment

Abstract

The embodiment of the utility model provides a heat-absorbing and liquid-supplementing structure, a battery, a battery pack and electric equipment, the battery comprises a shell and a pole core arranged in the shell, and the heat-absorbing and liquid-supplementing structure is used for being clamped between the pole core and the shell; the heat absorption and liquid supplement structure is provided with a heat absorption cavity part and a liquid supplement cavity part which are arranged at an interval, electrolyte is contained in the liquid supplement part, and when the expansion force of the pole core is larger than a preset value, the electrolyte in the liquid supplement part flows into the shell. The temperature rise rate of the battery can be reduced, electrolyte is supplemented for the battery, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a heat absorption and liquid replenishment structure, a battery, a battery pack and electrical equipment. Background Art

[0002] At present, as the battery fast charging requires a shorter charging time, the charging current needs to be increased. Increasing the charging current will increase the battery temperature, especially the positive and negative poles of the battery, which have relatively high temperatures, causing a temperature difference in the battery cell, and the high temperature area is prone to lithium deposition; at the same time, the battery temperature is too high, which has an adverse effect on the battery life and other electrical properties.

[0003] In the related art, a liquid cooling plate is usually set at the bottom of the battery. However, the cooling energy of the liquid cooling plate is limited and the liquid cooling effect is poor, resulting in a large temperature difference inside the battery, the temperature field cannot be balanced, and the lithium precipitation phenomenon does not change significantly, which is not conducive to ensuring the safety of battery use. Utility Model Content

[0004] In view of the above problems, embodiments of the present utility model are proposed to provide a heat-absorbing and liquid-replenishing structure, a battery, a battery pack, and an electrical device that overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above problems, the embodiment of the utility model discloses a heat-absorbing and liquid-replenishing structure for a battery, wherein the battery comprises: a shell, and a pole core and a heat-absorbing and liquid-replenishing structure arranged in the shell; wherein:

[0006] The heat absorption and liquid replenishment structure is used to be sandwiched between the pole core and the shell;

[0007] The heat absorption and fluid replenishment structure comprises a heat absorption part and a fluid replenishment part which are arranged at intervals. The fluid replenishment part contains electrolyte. When the expansion force of the pole core is greater than a preset value, the electrolyte in the fluid replenishment part flows into the shell from the crack.

[0008] Optionally, the heat absorption element includes a heat absorption cavity, and the heat absorption cavity contains a heat absorption medium.

[0009] Optionally, the liquid replenishing piece is provided with a notch, and the notch forms a crack when the expansion force of the pole core is greater than a preset value.

[0010] Optionally, the heat absorbing element comprises a first base film, and the first base film is used to encapsulate the heat absorbing medium in the heat absorbing element.

[0011] Optionally, the liquid replenishing member has a second base film, and the second base film is used to encapsulate the electrolyte in the liquid replenishing member.

[0012] Optionally, the heat absorbing member includes a first base film, the first base film is used to encapsulate the heat absorbing medium in the heat absorbing cavity, and the first base film includes: at least one of a PP film, a PE film, a PET film, and a PVC film.

[0013] And / or, the liquid replenishing piece has a second base film, the second base film is used to encapsulate the electrolyte in the liquid replenishing piece, and the second base film includes: at least one of a PP film, a PE film, a PET film, and a PVC film.

[0014] Optionally, the first base film and the second base film are integrally formed.

[0015] Optionally, the heat absorbing medium includes at least one of paraffin, expanded graphite, graphene, conductive carbon black, and conductive carbon tubes.

[0016] Optionally, the total number of the heat absorbing components and the fluid replenishing components is greater than or equal to three, and the heat absorbing components and the fluid replenishing components are alternately arranged.

[0017] In a second aspect, an embodiment of the utility model discloses a battery, comprising: a shell, a pole core disposed in the shell, and the above-mentioned heat absorption and liquid replenishment structure;

[0018] The heat absorption and fluid replenishment structure is arranged in the shell, and the heat absorption and fluid replenishment structure is sandwiched between the pole core and the shell.

[0019] Optionally, the heat absorption and fluid replenishment structure is arranged between the pole core and the shell along the thickness direction of the pole core.

[0020] Optionally, the heat absorption component and the liquid replenishing component are alternately arranged along the first direction and / or the second direction, and the plane where the first direction and the second direction are located forms an angle with the thickness direction of the pole core.

[0021] Optionally, the orthographic projection area of ​​the heat absorption component in the thickness direction of the pole core is a first area, and the orthographic projection area of ​​the liquid replenishing component in the thickness direction of the pole core is a second area, and the second area is smaller than the first area.

[0022] Optionally, in the thickness direction of the pole core, the heat absorption and fluid replenishment structure is provided on opposite sides of the pole core.

[0023] Optionally, the heat absorption and fluid replenishment structure is fixed to a side of the pole core facing the shell by an adhesive.

[0024] Optionally, the binder includes one of a PVDF binder and a SBR binder.

[0025] In a third aspect, an embodiment of the utility model further discloses a battery pack, comprising the above-mentioned battery.

[0026] In a fourth aspect, an embodiment of the utility model further discloses an electrical device, comprising the above-mentioned battery or the above-mentioned battery pack, wherein the battery or the battery pack is used to provide power to the electrical device.

[0027] The utility model embodiment includes the following advantages:

[0028] In the embodiment of the utility model, the heat-absorbing and refilling structure is sandwiched between the pole core and the shell. Since the heat-absorbing and refilling structure has a heat-absorbing component, during the charging process of the battery, the heat-absorbing component can absorb the heat generated by the pole core, and can also conduct part of the heat to the shell, which has a strong cooling effect, can reduce the temperature difference in the pole core, reduce the overall temperature rise rate of the battery, can achieve temperature balance and low temperature rise, and can improve the safety and service life of the battery. In addition, since the heat-absorbing and refilling structure also has a refilling component containing electrolyte, when the expansion force of the pole core is greater than a preset value, the electrolyte in the refilling component can flow into the shell, and the electrolyte can be replenished for the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a battery of the utility model;

[0030] Figure 2 This is a schematic diagram of the structure inside a shell of the utility model;

[0031] Figure 3 It is a structural schematic diagram of a heat-absorbing and fluid-replenishing structure of the utility model;

[0032] Figure 4 This utility model Figure 3 A cross-sectional view along the direction of arrow AA;

[0033] Figure 5 This utility model Figure 4 Enlarged view of point B in the middle.

[0034] Description of reference numerals:

[0035] 1-shell, 2-pole core, 3-heat absorption and liquid replenishment structure, 31-heat absorption part, 311-heat absorption cavity, 312-first base film, 32-liquid replenishment part, 321-liquid replenishment cavity, 322-second base film, 35-notch, 41-positive pole, 42-negative pole, 5-binder. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this utility model, unless otherwise specified, "multiple" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] One of the core concepts of the embodiments of the present utility model is to disclose a heat absorption and liquid replenishment structure, which can be used in batteries, such as Figure 1-5 As shown, the battery may include a shell 1 and a pole core 2 arranged in the shell 1, and a heat-absorbing and liquid-replenishing structure 3 is used to be sandwiched between the pole core 2 and the shell 1; the heat-absorbing and liquid-replenishing structure 3 has a spaced heat-absorbing component 31 and a liquid-replenishing component 32, and the liquid-replenishing component 32 contains electrolyte. When the expansion force of the pole core 2 is greater than a preset value, the electrolyte in the liquid-replenishing component 32 flows into the shell 1.

[0041] In the embodiment of the utility model, the heat-absorbing and refilling structure 3 is sandwiched between the pole core 2 and the shell 1. Since the heat-absorbing and refilling structure 3 has a heat-absorbing component 31, during the battery charging process, the heat-absorbing component 31 can absorb the heat generated by the pole core 2, and can also conduct part of the heat to the shell 1. The cooling effect is strong, which can reduce the temperature difference in the pole core 2, reduce the overall temperature rise rate of the battery, achieve temperature balance and low temperature rise, and improve the safety and service life of the battery. In addition, since the heat-absorbing and refilling structure 3 also has a refilling component 32 containing electrolyte, when the expansion force of the pole core 2 is greater than a preset value, the electrolyte in the refilling component 32 can flow into the shell 1, and the electrolyte can be replenished for the battery.

[0042] The battery described in the embodiment of the utility model includes but is not limited to lithium battery, sodium battery, etc. The embodiment of the utility model is only described by taking lithium battery as an example. For example, the phenomenon of electrolyte loss in lithium battery is lithium plating. Lithium plating is a loss condition of lithium-ion battery. Repeated charging at low temperature will damage the battery and reduce the safety of the battery, especially when it is squeezed and impacted by the outside world.

[0043] Specifically, the battery may include a shell 1, a core 2 and a heat-absorbing and liquid-replenishing structure 3. The shell 1 may have a receiving cavity, and the core 2 and the heat-absorbing and liquid-replenishing structure 3 may be disposed in the receiving cavity. Specifically, the core 2 is the main structure of the battery, and the core 2 may be formed by winding an electrode sheet and a diaphragm.

[0044] Specifically, the endothermic liquid replenishment structure 3 can be sandwiched between the pole core 2 and the shell 1, and the endothermic liquid replenishment structure 3 can be connected to the pole core 2 or the shell 1. During the charging process of the battery, the temperature of the middle area of ​​the pole core 2 rises. Since the endothermic liquid replenishment structure 3 has a heat absorbing member 31, the heat absorbing member 31 can absorb the heat of the pole core 2. At the same time, the heat absorbing member 31 can also conduct part of the heat to the shell 1 for heat dissipation. In this way, the pole core 2 can be cooled down, thereby reducing the temperature difference in the pole core 2, reducing the overall temperature rise rate of the battery, and avoiding the problem of excessive local current at the edge of the pole core 2 causing electrolyte loss.

[0045] Optionally, the heat absorbing member 31 may be a rigid structural member made of metal material and having heat absorbing capability, or may be a deformable structure having a cavity for accommodating a phase change material.

[0046] Specifically, the heat-absorbing and refilling structure 3 also has a refilling part 32, and the refilling part 32 contains electrolyte. Furthermore, during the cycle of the battery, the pole core 2 expands periodically. In the early stage of the expansion of the pole core 2, the pole core 2 is evenly compressed, which can avoid the problem of electrolyte loss caused by the deformity of the edge area of ​​the pole core 2 due to force; in the late stage of the expansion of the pole core 2, the expansion force of the pole core 2 is greater than the preset value, and the preset value can be set according to actual needs. The pole core 2 squeezes the heat-absorbing and refilling structure 3. When the expansion force of the pole core 2 is greater than the preset value, the refilling part 32 is broken, and the electrolyte in the refilling part 32 can flow into the shell 1 from the crack, which can replenish the electrolyte and improve the cycle performance of the battery.

[0047] Optionally, the liquid replenishing member 32 is provided with a notch 35, and the notch 35 forms a crack when the expansion force of the pole core is greater than a preset value.

[0048] In the embodiment of the utility model, a notch 35 is provided on the heat absorption and liquid replenishment structure 3, so that the notch 35 of the heat absorption and liquid replenishment structure 3 is a weak point under stress. After the pole core 2 is expanded and squeezed, the heat absorption and liquid replenishment structure 3 can be cracked at the notch 35, so that the liquid replenishment component 32 can form a crack here, so that the electrolyte in the heat absorption component 31 can flow into the shell 1 to replenish the electrolyte.

[0049] Specifically, Figure 3 As shown, the notch 35 may be in the shape of a long strip, or the notch 35 may be in the shape of an arc.

[0050] Optionally, the heat absorption member 31 may include a heat absorption chamber 311 , and a heat absorption medium may be contained in the heat absorption chamber 311 , so as to absorb and conduct heat through the heat absorption medium, thereby cooling the pole core 2 .

[0051] Optionally, the heat absorbing medium can be made of phase change material, and the heat absorbing element 31 can change between solid and liquid. The heat absorbing element 31 can change from solid to liquid after absorbing heat, and can change from liquid to solid after releasing heat.

[0052] Optionally, the heat absorption medium includes at least one of paraffin, expanded graphite, graphene, conductive carbon black, and conductive carbon tubes, which can improve the heat absorption capacity and thermal conductivity of the heat absorption component 31, effectively improve the cooling effect on the pole core 2, achieve temperature balance and low temperature rise, and help to extend the service life of the battery.

[0053] Specifically, the heat absorbing element 31 may include a phase change material selected from the group consisting of paraffin, expanded graphite, graphene, conductive carbon black, and conductive carbon tubes, or the heat absorbing element 31 may include two or more phase change materials selected from the group consisting of paraffin, expanded graphite, graphene, conductive carbon black, and conductive carbon tubes.

[0054] Specifically, the thermal conductivity of the phase change material is much higher than that of the air. In the embodiment of the utility model, the phase change material is used for heat absorption, which can absorb most of the heat, facilitate the balance of the temperature field in the pole core 2, and reduce the loss of the electrolyte. For example, the thermal conductivity of graphene can reach 3000-5000W / (m·K), while the thermal conductivity of air is 0.01-0.04w / (m·K).

[0055] Specifically, when the heat absorption element 31 contains a mixture of at least two phase change materials, for example, the thermal conductivity of graphene can reach 3000-5000 W / (m·K), and the specific heat capacity of paraffin can reach 2.1-2.4 J / g℃. Both graphene and paraffin can play the role of heat conduction and heat absorption. When assembling the heat absorption and fluid replenishment structure and the pole core 2, the graphene layer can be arranged between the pole core 2 and the paraffin layer, so that the graphene layer can mainly play the role of heat conduction, and the paraffin layer can mainly play the role of heat absorption.

[0056] Optionally, the total number of heat absorbing components 31 and liquid replenishing components 32 can be greater than or equal to three, and the heat absorbing components 31 and liquid replenishing components 32 can be arranged alternately, so as to improve the distribution uniformity of the heat absorbing components 31, facilitate the heat absorbing components 31 to cool down the pole core 2, ensure the temperature balance of the pole core 2, reduce the temperature difference in the pole core 2, and thereby avoid the problem of lithium deposition in the pole core 2 due to excessive local current at the edge.

[0057] Specifically, the number of the heat absorbing member 31 may include at least one, and the number of the liquid replenishing member 32 may also include at least one. Figure 4 As shown, a situation where a liquid replenishing component 32 is arranged between two heat absorbing components 31 is illustrated, and other situations can refer to the arrangement.

[0058] Optionally, the heat absorbing member 31 may include a first base film 312 , and the first base film 312 may be used to encapsulate the heat absorbing medium in the heat absorbing cavity 311 , so as to facilitate storage of the heat absorbing medium.

[0059] Optionally, the first base film 312 is connected to the pole core 2 to fix the position of the heat absorption element 31, which can improve the reliability of the heat absorption element 31 in absorbing and conducting heat to the pole core 2, thereby ensuring the stability of cooling the pole core 2.

[0060] Optionally, the first base film 312 may include at least one of a PP film, a PE film, a PET film, and a PVC film, which can improve the reliability of the first base film 312 encapsulating the heat absorbing medium.

[0061] Specifically, after the first base film 312 is packaged and closed, the heat absorbing medium can be directly sealed in the heat absorbing element 31, and the heat absorbing cavity 311 is a closed cavity. The packaging method of the first base film 312 can be heat sealing.

[0062] Specifically, the material of the PP film is polypropylene (PP), the material of the PE film is polyethylene (PE), the material of the PET film is polyethylene terephthalate (PET), and the material of the PVC film is polyvinyl chloride (PVC).

[0063] In some other optional embodiments of the present invention, the liquid replenishing member 32 has a second base film 322, and the second base film 322 can be used to encapsulate the electrolyte in the liquid replenishing member 32, so as to facilitate the storage of the electrolyte.

[0064] Optionally, the second base film 322 is connected to the pole core 2 to fix the position of the liquid replenishing member 32 and improve the reliability of replenishing the electrolyte to the battery.

[0065] Optionally, the second base film 322 may include at least one of a PP film, a PE film, a PET film, and a PVC film, which can improve the reliability of the second base film 322 encapsulating the electrolyte in the liquid replenishing member 32 .

[0066] Specifically, after the second base film 322 is sealed and closed, a sealed liquid replenishing cavity 321 can be formed to seal the electrolyte in the liquid replenishing member 32. The second base film 322 can be packaged by heat sealing.

[0067] Optionally, the first base film 312 and the second base film 322 may be integrally formed, so that the heat absorption and fluid replenishment structure 3 may be an integral structure, which may improve the reliability of installation and fixation of the heat absorption and fluid replenishment structure 3 .

[0068] Optionally, the first base film 312 and the second base film 322 may also be independently provided, so that the heat absorption component 31 and the liquid replenishing component 32 may be independent structural components.

[0069] Specifically, when the heat absorption component 31 includes the first base film 312 , the liquid replenishing component 32 may include the second base film 322 , or may not include the second base film 322 ; when the liquid replenishing component 32 includes the second base film 322 , the heat absorption component 31 may also not include the first base film 312 .

[0070] The heat absorption and fluid replenishment structure described in the embodiment of the utility model has at least the following advantages:

[0071] The heat-absorbing and refilling structure is sandwiched between the pole core and the shell. Since the heat-absorbing and refilling structure has a heat-absorbing component, during the charging process of the battery, the heat-absorbing component can absorb the heat generated by the pole core, and can also conduct part of the heat to the shell. The cooling effect is strong, and the temperature difference in the pole core can be reduced, and the overall temperature rise rate of the battery can be reduced. The effect of temperature balance and low temperature rise can be achieved, and the safety and service life of the battery can be improved. In addition, since the heat-absorbing and refilling structure also has a refilling component containing electrolyte, when the expansion force on the pole core is greater than a preset value, the electrolyte in the refilling component can flow into the shell, and the electrolyte can be replenished for the battery.

[0072] In the second aspect, the embodiment of the utility model also discloses a battery, which may include: a shell, a pole core arranged in the shell, and the above-mentioned heat absorption and fluid replenishment structure; the heat absorption and fluid replenishment structure 3 is arranged in the shell, and the heat absorption and fluid replenishment structure is clamped between the pole core 2 and the shell 1. The heat absorption and fluid replenishment structure 3 can cool the pole core 2 and replenish electrolyte for the battery.

[0073] Optionally, the heat absorption and liquid replenishment structure 3 can be arranged between the pole core 2 and the shell 1 along the thickness direction of the pole core 2, so that the heat absorption and liquid replenishment structure 3 can contact the side of the pole core 2 with a larger area, which is convenient for the heat absorption and liquid replenishment structure 3 to cool the pole core 2 and reduce the temperature difference inside the pole core 2.

[0074] Specifically, the pole core 2 may include a first side and a second side opposite to each other along its thickness direction, and the first side and / or the second side may be in contact with the heat absorption and fluid replenishment structure 3, that is, the heat absorption and fluid replenishment structure 3 may be arranged on the first side and / or the second side of the pole core 2.

[0075] Optionally, in the thickness direction of the pole core 2, the heat absorption and fluid replenishment structure 3 is provided on the opposite sides of the pole core 2. In this way, the two heat absorption and fluid replenishment structures 3 can be used to conduct heat and absorb heat to the pole core 2, which can further improve the cooling efficiency and cooling effect of the pole core 2, and more electrolyte can be added to the battery to further improve the cycle performance of the battery.

[0076] Optionally, the heat absorption component 31 and the fluid replenishment component 32 can be alternately arranged along the first direction and / or the second direction, and the planes where the first direction and the second direction are located are arranged at an angle to the thickness direction of the pole core 2, so that the heat absorption component 31 is opposite to the first side surface and / or the second side surface of the pole core 2 in the thickness direction, which can increase the contact area between the heat absorption and fluid replenishment structure 3 and the pole core 2, and can improve the reliability of cooling the pole core 2.

[0077] Specifically, the heat absorbing member 31 and the liquid replenishing member 32 may be arranged alternately along the first direction, and / or, the heat absorbing member 31 and the liquid replenishing member 32 may be arranged alternately along the second direction. The planes where the first direction and the second direction are located are arranged at an angle with the thickness direction of the pole core 2, and the angle may be a right angle or a nearly right angle.

[0078] Furthermore, the angle between the first direction and the second intersection may be an acute angle, a right angle, an obtuse angle, or the like.

[0079] Optionally, the first direction may be the length direction of the pole core 2, and the second direction may be the width direction of the pole core 2, which can further increase the contact area between the heat absorption and liquid replenishment structure 3 and the pole core 2, thereby increasing the heat absorption area of ​​the heat absorption element 31 to the pole core 2. Figure 2 As shown, a positive electrode column 41 and a negative electrode column 42 are respectively provided at two ends of the pole core 2 in the first direction.

[0080] Optionally, the orthographic projection area of ​​the heat absorption component 31 in the thickness direction of the pole core 2 is a first area, and the orthographic projection area of ​​the liquid replenishing component 32 in the thickness direction of the pole core 2 is a second area, and the second area is smaller than the first area.

[0081] In the embodiment of the utility model, the first area is larger than the second area, which can increase the matching area between the heat absorption component 31 and the pole core 2, improve the cooling efficiency of the pole core 2, and improve the cooling effect of the pole core 2.

[0082] Optionally, the heat absorption and liquid replenishment structure 3 can be fixed to the side of the pole core 2 facing the shell 1 by an adhesive 5, so that the heat absorption and liquid replenishment structure 3 can be close to the pole core 2, which can improve the reliability and convenience of the heat absorption component 31 for absorbing and conducting heat to the pole core 2.

[0083] Specifically, during the lamination process, the pole core 2 may be subjected to a heat pressing treatment, and then the heat absorption and liquid replenishment structure 3 may be bonded to the outermost layer of the pole core 2 by the adhesive 5 .

[0084] Optionally, the adhesive 5 may include one of a PVDF adhesive and a SBR adhesive to improve the reliability of the fixation between the heat absorption and liquid replenishment structure 3 and the pole core 2 .

[0085] Specifically, the material of the binder 5 may be polyvinylidene fluoride (PVDF) or styrene butadiene rubber (SBR).

[0086] The battery described in the embodiment of the utility model has at least the following advantages:

[0087] The heat-absorbing and refilling structure is sandwiched between the pole core and the shell. Since the heat-absorbing and refilling structure has a heat-absorbing component, during the charging process of the battery, the heat-absorbing component can absorb the heat generated by the pole core, and can also conduct part of the heat to the shell. The cooling effect is strong, and the temperature difference in the pole core can be reduced, and the overall temperature rise rate of the battery can be reduced. The effect of temperature balance and low temperature rise can be achieved, and the safety and service life of the battery can be improved. In addition, since the heat-absorbing and refilling structure also has a refilling component containing electrolyte, when the expansion force on the pole core is greater than a preset value, the electrolyte in the refilling component can flow into the shell, and the electrolyte can be replenished for the battery.

[0088] In a third aspect, an embodiment of the utility model further discloses a battery pack, which may specifically include the battery.

[0089] Specifically, since the battery includes a pole core 2 and a shell 1, a heat absorption and liquid replenishment structure 3 is arranged between the pole core 2 and the shell 1. The heat absorption and liquid replenishment structure 3 can absorb and conduct heat to the pole core 2, thereby reducing the temperature difference in the pole core 2 and reducing the risk of lithium deposition in the pole core 2, thereby increasing the service life of the battery. In this way, using the battery to assemble the battery pack can also increase the service life of the battery pack.

[0090] In a fourth aspect, an embodiment of the utility model further discloses an electrical device, which may specifically include the above-mentioned battery or the above-mentioned battery pack.

[0091] Specifically, according to the above analysis, both the battery and the battery pack can have a relatively long service life, and applying the battery and the battery pack to the electrical equipment can also improve the electrical safety of the electrical equipment.

[0092] Although the preferred embodiments of the utility model embodiments have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the utility model embodiments.

[0093] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0094] The heat absorption and fluid replenishment structure, battery, battery pack and electrical equipment provided by the utility model are introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model; at the same time, for general technical personnel in this field, according to the idea of ​​the utility model, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A heat-absorbing and liquid-replenishing structure for a battery, the battery comprising a shell and a pole core arranged in the shell, characterized in that: The heat absorption and liquid replenishment structure is used to be sandwiched between the pole core and the shell; The heat absorption and fluid replenishment structure comprises a heat absorption component and a fluid replenishment component which are arranged at intervals. The fluid replenishment component contains electrolyte. When the expansion force of the pole core is greater than a preset value, the electrolyte in the fluid replenishment component flows into the shell.

2. The heat absorption and fluid replenishment structure according to claim 1, characterized in that: The heat absorbing element comprises a heat absorbing cavity, and the heat absorbing cavity contains a heat absorbing medium.

3. The heat absorption and fluid replenishment structure according to claim 1, characterized in that: The liquid replenishing piece is provided with a notch, and the notch forms a crack when the expansion force of the pole core is greater than a preset value.

4. The heat absorption and fluid replenishment structure according to claim 2, characterized in that: The heat absorbing element includes a first base film, and the first base film is used to encapsulate the heat absorbing medium in the heat absorbing cavity.

5. The heat absorption and fluid replenishment structure according to claim 1, characterized in that: The liquid replenishing member has a second base film, and the second base film is used to encapsulate the electrolyte in the liquid replenishing member.

6. The heat absorption and fluid replenishment structure according to claim 2, characterized in that: The heat absorbing member includes a first base film, and the first base film is used to encapsulate the heat absorbing medium in the heat absorbing cavity. And / or, the liquid replenishing member has a second base film, and the second base film is used to encapsulate the electrolyte in the liquid replenishing member.

7. The heat absorption and fluid replenishment structure according to claim 6, characterized in that: The first base film and the second base film are integrally formed.

8. The heat absorption and fluid replenishment structure according to claim 1, characterized in that: The total number of the heat absorbing components and the liquid replenishing components is greater than or equal to three, and the heat absorbing components and the liquid replenishing components are alternately arranged.

9. A battery, characterized in that: include: A shell, a pole core arranged in the shell, and the heat absorption and fluid replenishment structure according to any one of claims 1 to 8; The heat absorption and fluid replenishment structure is arranged in the shell, and the heat absorption and fluid replenishment structure is sandwiched between the pole core and the shell.

10. The battery according to claim 9, characterized in that The heat absorption and fluid replenishment structure is arranged between the pole core and the shell along the thickness direction of the pole core.

11. The battery according to claim 9, characterized in that The heat absorption component and the liquid replenishing component are alternately arranged along the first direction and / or the second direction, and the planes where the first direction and the second direction are located are arranged at an angle with the thickness direction of the pole core.

12. The battery according to claim 9, characterized in that The orthographic projection area of ​​the heat absorption component in the thickness direction of the pole core is a first area, and the orthographic projection area of ​​the liquid replenishing component in the thickness direction of the pole core is a second area, and the second area is smaller than the first area.

13. The battery according to claim 9, characterized in that In the thickness direction of the pole core, the heat absorption and liquid replenishment structure is arranged on opposite sides of the pole core.

14. The battery according to claim 9, characterized in that The heat absorption and fluid replenishment structure is fixed to the side of the pole core facing the shell through an adhesive.

15. The battery according to claim 14, characterized in that The binder includes one of a PVDF binder and a SBR binder.

16. A battery pack, characterized in that: The invention comprises a plurality of batteries according to any one of claims 9 to 15.

17. An electrical equipment, characterized in that: It comprises an electrical appliance, a battery as described in any one of claims 9 to 15 or a battery pack as described in claim 16, wherein the battery or the battery pack is used to provide power to the electrical appliance.

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