Battery and electric device

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery and an electric device. The battery comprises a shell and a battery cell arranged in the shell, and further comprises a heat dissipation assembly, the heat dissipation assembly is arranged between the outer wall of the battery cell and the inner wall of the shell, and the heat dissipation assembly is of a temperature-related deformable structure; the heat dissipation assembly has a heat conduction state and a contraction state, when the heat dissipation assembly is in the heat conduction state, the heat dissipation assembly is in contact with the battery cell and the shell, and the sum of the contact areas of the heat dissipation assembly, the battery cell and the shell is a first contact area; when the heat dissipation assembly is in the contraction state, the sum of the contact areas of the heat dissipation assembly, the battery cell and the shell is a second contact area, and the second contact area is smaller than the first contact area. According to the battery and the electric device provided by the utility model, the temperature uniformity in the battery is improved, and the use safety of the battery and the electric device is further improved.

Description

Technical Field

[0001] The utility model relates to the field of battery technology, and in particular to a battery and an electrical device. Background Technology

[0002] In current cylindrical batteries, the same-side tab technology is compared to the opposite-side tab technology. By integrating and welding the tab, collector plate, and cover plate, it can shorten the current flow path, reduce the internal resistance of the structure, and improve the rate charge and discharge performance. However, during the high-current charge and discharge process, a large temperature gradient is generated inside the battery, which will cause the battery cycle performance to decay quickly.

[0003] In the prior art, due to the unique structure of cylindrical batteries with tabs on the same side, the positive and negative poles are located on the same side. When discharging at a high rate, the current flows through the same side of the battery (for example, when the battery is placed upright, the tabs are located at the top, which is where the current flows through). This causes the temperature of the tabs and the upper end of the battery to be higher than the temperature of the bottom of the battery, resulting in a serious imbalance in the internal temperature field distribution, which is not conducive to improving the battery life and poses certain safety risks when the temperature is too high.

[0004] Therefore, it is urgent to provide a new type of battery and power device to solve the above technical problems in the prior art. Contents of utility model

[0005] The purpose of the utility model is to provide a battery, which improves the temperature uniformity inside the battery and improves the safety of battery use.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A battery, comprising a housing and a battery cell disposed in the housing, the battery also comprising a heat dissipation component;

[0008] The heat dissipation component is arranged between the outer wall of the battery core and the inner wall of the shell, and the heat dissipation component is a temperature-dependent deformable structure;

[0009] The heat dissipation component has a heat conduction state and a contraction state. When the heat dissipation component is in the heat conduction state, the heat dissipation component contacts both the battery core and the shell, and the sum of the contact areas of the heat dissipation component, the battery core and the shell is a first contact area; when the heat dissipation component is in the contraction state, the sum of the contact areas of the heat dissipation component, the battery core and the shell is a second contact area, and the second contact area is smaller than the first contact area.

[0010] Preferably, when the heat dissipation component is in the heat conduction state, the contact area between the heat dissipation component and the battery core and / or the shell is positively correlated with the temperature.

[0011] Preferably, when the heat dissipation component is in a contracted state, the heat dissipation component contacts at most one of the battery cell and the housing.

[0012] Preferably, the heat dissipation component includes a first heat conduction layer and a second heat conduction layer arranged in a stacked manner, and the thickness of the first heat conduction layer is positively correlated with the temperature;

[0013] When the heat dissipation component is in the heat conduction state, the first heat conduction layer contacts one of the battery cell and the housing, and the second heat conduction layer contacts the other of the battery cell and the housing.

[0014] Preferably, when the heat dissipation component is in the heat conduction state, the first heat conduction layer contacts the housing, the second heat conduction layer contacts the battery cell, and the heat conduction coefficient of the second heat conduction layer is greater than that of the first heat conduction layer.

[0015] Preferably, the heat dissipation component further includes a connection layer, and the connection layer is connected between the first heat conduction layer and the second heat conduction layer.

[0016] Preferably, the first heat conduction layer is provided with a first gap exposing the connection layer, and the connection layer is bonded to the outer wall of the battery cell or the inner wall of the housing through the first gap; and / or,

[0017] The second heat conduction layer is provided with a second gap exposing the connection layer, and the connection layer is bonded to the outer wall of the battery cell or the inner wall of the housing through the second gap; and / or, the connection layer includes a plurality of connection parts, and the plurality of connection parts are arranged at intervals along the circumferential direction of the battery cell.

[0018] Preferably, the heat dissipation component is connected to the outer wall of the battery cell; or, the heat dissipation component is connected to the inner wall of the housing; or, the heat dissipation component is connected to both the outer wall of the battery cell and the inner wall of the housing, and the connection area between the heat dissipation component and the outer wall of the battery cell is greater than or less than the connection area between the heat dissipation component and the inner wall of the housing.

[0019] Preferably, the first end of the battery cell has a tab, and the heat dissipation component is arranged between the circumferential outer wall of the first end of the battery cell and the circumferential inner wall of the housing.

[0020] The purpose of the present invention is to provide an electrical device with high safety.

[0021] To achieve this purpose, the present invention adopts the following technical solutions:

[0022] An electrical device, including the battery as described above.

[0023] The beneficial effects of the present invention:

[0024] For the battery and the electrical device provided by the present utility model, a heat dissipation component is arranged between the outer wall of the battery cell and the inner wall of the housing. The heat dissipation component is a deformable structure related to temperature. When the heat dissipation component is in a heat conduction state, the heat dissipation component is in contact with both the battery cell and the housing to achieve heat transfer between the battery cell and the housing. When the heat dissipation component is in a heat conduction state, the first contact area with the battery cell and the housing is larger than the second contact area with the battery cell and the housing when in a contracted state. When the heat dissipation component is in a heat conduction state, due to the larger contact area with the battery cell and the housing, the efficiency of heat conduction can be improved, so that the heat on the battery cell can be quickly transferred to the housing, improving the overall heat dissipation performance of the battery cell, making the temperature inside the battery cell more uniform and the temperature field balanced, and reducing the long-term life problem and safety risk of the battery cell caused by local heating problems; the heat dissipation component also has a contracted state. When the heat dissipation component is in a contracted state, the contact area between it and the battery cell and the housing is smaller, so that when the external temperature is relatively low, the heat dissipation component has a lower heat conduction ability to ensure that the temperature inside the battery cell is maintained within a normal range to improve the low-temperature performance and the use safety of the battery and the electrical device. Description of the Drawings

[0025] Figure 1 is a longitudinal sectional view of the battery when the heat dissipation component provided by the specific embodiment of the present utility model is in a heat conduction state;

[0026] Figure 2 is a schematic view of the heat dissipation component after being unfolded provided by the specific embodiment of the present utility model;

[0027] Figure 3 is a cross-sectional view of the heat dissipation component provided by the specific embodiment of the present utility model;

[0028] Figure 4 is a cross-sectional view of the battery cell and the heat dissipation component in an assembled state provided by the specific embodiment of the present utility model;

[0029] Figure 5 is a longitudinal sectional view of the battery when the heat dissipation component provided by the specific embodiment of the present utility model is in a contracted state Figure 1 ;

[0030] Figure 6 is a longitudinal sectional view of the battery when the heat dissipation component provided by the specific embodiment of the present utility model is in a contracted state Figure 2 ;

[0031] Figure 7 is a longitudinal sectional view of the battery when the heat dissipation component provided by the specific embodiment of the present utility model is in a contracted state Figure 3 。

[0032] In the figure:

[0033] 10. Housing; 20. Battery cell; 21. Tab; 30. Heat dissipation component; 31. First heat conduction layer; 32. Connection layer; 321. Connection part; 33. Second heat conduction layer; 40. Colloid. Detailed implementation manners

[0034] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that, for the convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0035] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0036] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above and over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below and under", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0037] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0038] The technical solution of the present utility model will be further described below with reference to the accompanying drawings and through specific implementation manners.

[0039] Please refer to Figures 1 to 7 , this embodiment provides a battery, which can improve the uniformity of the internal temperature and ensure the use safety of the battery.

[0040] Exemplarily, the battery in this embodiment can be a large cylindrical lithium battery or other batteries, and this embodiment does not limit this.

[0041] As Figure 1 shown, the battery includes a housing 10 and an electric core 20 placed inside the housing 10, which can be used to protect the electric core 20. The battery further includes a heat dissipation component 30, and the heat dissipation component 30 is used to assist the electric core 20 in dissipating heat to avoid the problem of excessive local temperature of the battery.

[0042] Exemplarily, please continue to refer to Figure 1 , the heat dissipation component 30 is arranged between the outer wall of the electric core 20 and the inner wall of the housing 10, and the heat dissipation component 30 is a temperature-related deformable structure. It should be noted that the temperature-related deformable structure specifically means that the heat dissipation component 30 can have different volumes at different temperatures. For example, the material of the heat dissipation component 30 can be a structure with thermal expansion and contraction. When the temperature is low, the volume of the heat dissipation component 30 is small; when the temperature is high, the volume of the heat dissipation component 30 is large. Exemplarily, the thermal conductivity coefficient of the heat dissipation component 30 is greater than that of air. For example, the material of the heat dissipation component 30 can be selected from materials with a relatively high thermal conductivity coefficient, such as silicone and other materials, and this embodiment does not limit this.

[0043] In some alternative embodiments, as Figure 3 shown, the heat dissipation component 30 is arranged between the circumferential outer wall of the electric core 20 and the circumferential inner wall of the housing 10, and the heat dissipation component 30 is arranged around the electric core 20 in a circumferential direction for one week, so as to be able to uniformly transfer the heat on the electric core 20 to the housing 10, making the temperature of the electric core 20 more uniform in the circumferential direction and improving the temperature equalization effect. Since the end face of the electric core 20 is usually provided with a tab 21, therefore, arranging the heat dissipation component 30 on the circumferential outer wall of the electric core 20 can avoid interference with the tab 21 and improve the reliability. Exemplarily, the length of the heat dissipation component 30 is 135 mm to 150 mm to be applicable to the 46-series large cylindrical electric core 20. For example, the length of the heat dissipation component 30 is 135 mm, 140 mm, 150 mm, etc.

[0044] In this embodiment, the heat dissipation component 30 has a heat conduction state and a contraction state. Among them, Figure 1 is a schematic diagram of the heat dissipation component 30 in the heat conduction state, Figures 5 to 7Schematic diagram when the heat dissipation component 30 is in a contracted state. When the heat dissipation component 30 is in a heat conduction state, the heat dissipation component 30 is in contact with both the battery cell 20 and the housing 10, enabling the heat on the battery cell 20 to be transferred to the housing 10 through the heat dissipation component 30 and then dissipated by the housing 10. Moreover, when the heat dissipation component 30 is in a heat conduction state, the sum of the contact areas of the heat dissipation component 30 with the battery cell 20 and the housing 10 is the first contact area. When the heat dissipation component 30 is in a contracted state, the sum of the contact areas of the heat dissipation component 30 with the battery cell 20 and the housing 10 is the second contact area. Among them, the second contact area is smaller than the first contact area.

[0045] For the battery provided in this embodiment, a heat dissipation component 30 is provided between the outer wall of the battery cell 20 and the inner wall of the housing 10. The heat dissipation component 30 is a deformable structure related to temperature. When the heat dissipation component 30 is in a heat conduction state, the heat dissipation component 30 is in contact with both the battery cell 20 and the housing 10 to achieve heat transfer between the battery cell 20 and the housing 10. When the heat dissipation component 30 is in a heat conduction state, the first contact area of the heat dissipation component 30 with the battery cell 20 and the housing 10 is larger than the second contact area with the battery cell 20 and the housing 10 when in a contracted state. When the heat dissipation component 30 is in a heat conduction state, due to the larger contact area with the battery cell 20 and the housing 10, the efficiency of heat conduction can be improved, enabling the heat on the battery cell 20 to be quickly transferred to the housing 10, improving the overall heat dissipation performance of the battery cell 20, making the internal temperature of the battery cell 20 more uniform and the temperature field balanced, and reducing the long-term life problem and safety risk of the battery cell 20 caused by local heating problems; the heat dissipation component 30 also has a contracted state. When the heat dissipation component 30 is in a contracted state, the contact area between it and the battery cell 20 and the housing 10 is smaller, so that when the external temperature is relatively low, the heat dissipation component 30 has a lower heat conduction ability to ensure that the internal temperature of the battery cell 20 is maintained within a normal range to improve the low-temperature performance.

[0046] In this embodiment, the second contact area can be zero or non-zero, and this embodiment does not limit this. When the second contact area is zero, the heat dissipation component 30 in the contracted state is not in contact with both the battery cell 20 and the housing 10.

[0047] Optionally, when the heat dissipation component 30 is in a heat conduction state, the contact area of the heat dissipation component 30 with the battery cell 20 and / or the housing 10 is positively correlated with the temperature. That is, the higher the temperature of the heat dissipation component 30, the larger the contact area of the heat dissipation component 30 with the battery cell 20 and the housing 10, so that the more heat is transferred by the heat dissipation component 30 to quickly reduce the temperature of the battery cell 20; the lower the temperature of the heat dissipation component 30, the smaller the contact area of the heat dissipation component 30 with the battery cell 20 and the housing 10 to avoid the situation where the temperature of the battery cell 20 is too low due to a larger contact area. The heat dissipation component 30 provided in this embodiment has high flexibility, can be applied to a variety of temperature scenarios, has high heat dissipation performance and low cost.

[0048] Exemplarily, when the heat dissipation component 30 is in a contracted state, the heat dissipation component 30 contacts at most one of the battery cell 20 and the housing 10, so that heat transfer between the battery cell 20 and the housing 10 is not carried out. For example, when the heat dissipation component 30 is in a contracted state, as Figure 5 and Figure 6 shown, the heat dissipation component 30 contacts the battery cell 20 and is separated from the housing 10; it can also be that the heat dissipation component 30 contacts the housing 10 and is separated from the battery cell 20; it can also be that the heat dissipation component 30 is separated from both the battery cell 20 and the housing 10, and this embodiment does not limit this. When the heat dissipation component 30 is separated from both the battery cell 20 and the housing 10, the heat dissipation component 30 can be connected to the housing 10 through an adiabatic connecting member, so that the heat dissipation component 30 can be disposed between the outer wall of the battery cell 20 and the inner wall of the housing 10.

[0049] In some alternative embodiments, as Figure 2 shown, the heat dissipation component 30 includes a first heat conducting layer 31 and a second heat conducting layer 33 which are stacked. Among them, the thickness of the first heat conducting layer 31 is positively correlated with the temperature, that is, the volume of the first heat conducting layer 31 changes with the temperature. In this embodiment, the thickness of the first heat conducting layer 31 increases with the increase of the temperature and decreases with the decrease of the temperature.

[0050] When the heat dissipation component 30 is in a heat conducting state, the first heat conducting layer 31 contacts one of the battery cell 20 and the housing 10, and the second heat conducting layer 33 contacts the other of the battery cell 20 and the housing 10, so that heat transfer between the battery cell 20 and the housing 10 is carried out through the first heat conducting layer 31 and the second heat conducting layer 33. The contact area between the first heat conducting layer 31 and this one increases with the increase of the temperature. While the first heat conducting layer 31 deforms, it pushes the second heat conducting layer 33 closer to the other one, and further the contact area between the second heat conducting layer 33 and the other one will also increase, and further more heat on the battery cell 20 can be transferred to the housing 10, realizing efficient cooling of the battery cell 20.

[0051] When the heat dissipation component 30 is in a contracted state, the sum of the contact area between the first heat conducting layer 31 and one of the battery cell 20 and the housing 10 and the contact area between the second heat conducting layer 33 and the other of the battery cell 20 and the housing 10 is smaller than the sum of the contact area between the first heat conducting layer 31 and this one and the contact area between the second heat conducting layer 33 and the other one when the heat dissipation component 30 is in a heat conducting state, so as to reduce the heat transfer amount.

[0052] Exemplarily, when the heat dissipation component 30 is in a heat conduction state, the first heat conduction layer 31 contacts the housing 10, the second heat conduction layer 33 contacts the battery cell 20, and the heat conduction coefficient of the second heat conduction layer 33 is greater than that of the first heat conduction layer 31. By arranging the second heat conduction layer 33 with a high heat conduction coefficient to contact the battery cell 20, the heat on the battery cell 20 can be quickly transferred to the second heat conduction layer 33, so that the second heat conduction layer 33 can serve as a high-temperature carrier, avoiding the situation of excessive local temperature of the battery cell 20 and the problem of imbalance in the temperature field distribution of the battery cell 20, which is beneficial to ensuring the service life of the battery cell 20. It should be noted that the heat conduction coefficients of both the first heat conduction layer 31 and the second heat conduction layer 33 are greater than the heat conduction coefficient of air (the heat conduction coefficient of air is 0.03 W / m·K).

[0053] The heat on the second heat conduction layer 33 can be transferred to the first heat conduction layer 31 and then transferred to the housing 10 through the first heat conduction layer 31, thereby realizing heat dissipation. Since the second heat conduction layer 33 absorbs more heat released by the battery cell 20, a large temperature difference is generated between the second heat conduction layer 33 and the first heat conduction layer 31, which can improve the efficiency of temperature transfer between the second heat conduction layer 33 and the first heat conduction layer 31 and is conducive to the release of the temperature of the second heat conduction layer 33.

[0054] In some alternative embodiments, the first heat conduction layer 31 can be a silicone sheet mixed with a shape memory polymer material (SMP), with a blending amount of 10% - 30% and a heat conduction coefficient of 2 - 3 W / m·K. For example, the shape memory polymer material can be a blend polymer obtained by compound modification using one or more of polyester polymers such as PET (polyethylene terephthalate), PBT (polybutylene terephthalate), PCTG (polyethylene terephthalate - 1,4 - cyclohexanedimethanol ester), and PC (polycarbonate) as raw materials. Or, the shape memory change material contains a flexible blend polymer with EVA (ethylene - vinyl acetate copolymer), polyethylene glycol, shape memory polyurethane, and various resins.

[0055] Exemplarily, the second heat conduction layer 33 can be a diamond film, and the heat conduction coefficient of the second heat conduction layer 33 is 1500 - 2000 W / m·K. Of course, it can be understood that the second heat conduction layer 33 can also be made of other materials with a high heat conduction coefficient and capable of elastic deformation.

[0056] In some alternative embodiments, as Figure 2 shown, a plurality of second heat conduction layers 33 are arranged at intervals along the height direction of the battery cell 20, and the plurality of second heat conduction layers 33 are all connected to the first heat conduction layer 31 and are all used for transferring heat. By arranging the plurality of second heat conduction layers 33 at intervals, the probability of interference between the expanded second heat conduction layers 33 is reduced.

[0057] In some alternative embodiments, the distance between the two second heat-conducting layers 33 in the height direction of the battery cell 20 is not less than the maximum outer diameter of the tab 21 of the battery cell 20, so that the orthographic projection of the tab 21 on the outer circumferential wall of the battery cell 20 can be completely located within the orthographic projection of the heat dissipation assembly 30 on the outer circumferential wall of the battery cell 20, so as to timely transfer the heat generated by the tab 21 and transferred to the battery cell 20 to the outside of the housing 10, improving the heat dissipation effect on the battery cell 20. Exemplarily, the distance between two adjacent second heat-conducting layers 33 in the height direction of the battery cell 20 is at least greater than 5 mm.

[0058] Exemplarily, please continue to refer to Figure 2 , the heat dissipation assembly 30 further includes a connection layer 32. The connection layer 32 is connected between the first heat-conducting layer 31 and the second heat-conducting layer 33, so that the first heat-conducting layer 31 is connected to the second heat-conducting layer 33 through the connection layer 32.

[0059] In some alternative embodiments, the connection layer 32 is a polyester high-temperature double-sided adhesive layer, which adhesively connects the first heat-conducting layer 31 and the second heat-conducting layer 33 through a high-temperature adhesive, so that the connection between the first heat-conducting layer 31 and the second heat-conducting layer 33 will not fail in a temperature environment, improving the connection reliability and strength. Of course, it can be understood that the connection layer 32 can be made of a heat-conducting material, which can further improve the heat dissipation capacity of the heat dissipation assembly 30.

[0060] Optionally, the heat dissipation assembly 30 may have a connection relationship with the battery cell 20 and the housing 10. For example, the heat dissipation assembly 30 is connected to the outer wall of the battery cell 20; or, the heat dissipation assembly 30 is connected to the inner wall of the housing 10; or, the heat dissipation assembly 30 is connected to both the outer wall of the battery cell 20 and the inner wall of the housing 10, and the connection area of the heat dissipation assembly 30 with the outer wall of the battery cell 20 is greater than or less than the connection area of the heat dissipation assembly 30 with the inner wall of the housing 10. By directly connecting the heat dissipation assembly 30 to the battery cell 20 and / or the housing 10, no other connection structures need to be introduced, making the structure of the battery relatively simple and reducing the assembly difficulty of the heat dissipation assembly 30. The connection area of the heat dissipation assembly 30 with the outer wall of the battery cell 20 is greater than or the connection area of the heat dissipation assembly 30 with the inner wall of the housing 10, so that when the external environment is relatively low, the heat dissipated by the battery cell 20 through the heat dissipation assembly 30 can be less, ensuring the low-temperature performance of the battery.

[0061] Exemplarily, there can be various ways for the heat dissipation assembly 30 to be connected to the battery cell 20 and the housing 10. For example, the heat dissipation assembly 30 can be bonded to the battery cell 20 and the housing 10, and can also be snap-connected or screwed to the battery cell 20 and the housing 10. This embodiment does not limit this.

[0062] Optionally, the first heat-conducting layer 31 in this embodiment is disposed on the side of the connecting layer 32 facing the housing 10, that is, when the heat-dissipating component 30 is in a heat-conducting state, the first heat-conducting layer 31 is in contact with the housing 10. In this embodiment, the first heat-conducting layer 31 is provided with a first gap exposing the connecting layer 32, and the connecting layer 32 is bonded to the inner wall of the housing 10 through the first gap to realize the connection between the heat-dissipating component 30 and the housing 10. Of course, it can be understood that when the first heat-conducting layer 31 is in contact with the battery cell 20, the connecting layer 32 is bonded to the outer wall of the battery cell 20 through the first gap.

[0063] Further optionally, a part of the first heat-conducting layer 31 can be fixedly connected to the housing 10, so that when the first heat-conducting layer 31 shrinks at low temperature, as Figure 7 shown, the part of the first heat-conducting layer 31 connected to the housing 10 still contacts the housing 101, so that the first heat-conducting layer 31 is not completely separated from the housing 10. With such a setting, the fixed area (i.e., the contact area) between the first heat-conducting layer 31 and the housing 10 at low temperature can be adjusted according to the actual working conditions of the battery and the ambient temperature, thereby realizing the control of the heat dissipation effect of the heat-dissipating component 30 on the battery cell 20.

[0064] Of course, it can be understood that it can also be set that the first heat-conducting layer 31 adopts a gradient blending of shape memory polymer material (SMP), or only a shape memory polymer material (SMP) is blended and added in some regions, so that when shrinking at low temperature, the first heat-conducting layer 31 can partially contact the housing 10. That is, as Figure 6 and Figure 7 shown, the shrinkage deformation of the first heat-conducting layer 31 is uneven at low temperature, that is, the deformation of the heat-dissipating component 30 is uneven when shrinking at low temperature. Through the methods of gradient blending and local blending, the cost of the shape memory polymer material (SMP) can be reduced, thereby reducing the cost of the battery. At the same time, since the edge support of the heat-dissipating component 30 still exists, the position of the battery cell 20 inside the housing 10 can be maintained stable.

[0065] In this embodiment, the second heat-conducting layer 33 is provided with a second gap exposing the connecting layer 32. When the second heat-conducting layer 33 is disposed on the side of the connecting layer 32 facing the battery cell 20, the connecting layer 32 is bonded to the outer wall of the battery cell 20 through the second gap. When the second heat-conducting layer 33 is disposed on the side of the connecting layer 32 facing the housing 10, the connecting layer 32 is bonded to the inner wall of the housing 10 through the second gap to realize the connection between the heat-dissipating component 30 and the battery cell 20 or the housing 10. It should be noted that the gaps of the above-mentioned multiple second heat-conducting layers 33 in the height direction of the battery cell 20 can form the above-mentioned second gap.

[0066] It can be seen that the connection layer 32 in this embodiment not only has the function of connecting the first heat-conducting layer 31 and the second heat-conducting layer 33, but also has the function of connecting the battery core 20 and the shell 10. It has rich functions and realizes the multi-purpose of the connection layer 32.

[0067] In some optional embodiments, the connection layer 32 includes a plurality of connection parts 321, and the plurality of connection parts 321 are arranged at intervals along the circumference of the battery cell 20. On the one hand, the material used for the connection layer 32 can be reduced, thereby reducing the cost. On the other hand, the portion of the first heat-conducting layer 31 that is not in contact with the connection part 321 can directly contact the second heat-conducting layer 33, thereby achieving direct contact between part of the first heat-conducting layer 31 and part of the second heat-conducting layer 33, reducing thermal resistance, and improving the heat transfer efficiency between the first heat-conducting layer 31 and the second heat-conducting layer 33, thereby improving the heat dissipation effect on the battery cell 20.

[0068] Optionally, in this embodiment, if Figure 4 As shown, the projection of the connection layer 32 on the circumferential outer wall of the battery cell 20 does not overlap with the projection of the tab 21 of the battery cell 20 on the circumferential outer wall of the battery cell 20, that is, the battery cell 20 and the connection layer 32 are staggered in the radial direction of the battery cell 20, that is, the connection layer 32 corresponds to the tab-free area of ​​the battery cell 20. Since the temperature of the area where the tab 21 of the battery cell 20 is provided is higher than that of other positions, the projection of the connection layer 32 on the circumferential outer wall of the battery cell 20 and the projection of the tab 21 of the battery cell 20 on the circumferential outer wall of the battery cell 20 are not overlapped, which can minimize the influence of the connection layer 32 on the heat dissipation capacity of the heat dissipation component 30, thereby ensuring the heat dissipation effect of the battery cell 20.

[0069] In this embodiment, the length of the first heat-conducting layer 31 and the second heat-conducting layer 33 is equal to the length of the heat-dissipating assembly 30, and the length of each connecting portion 321 is 20 mm to 25 mm, so as to ensure the heat dissipation effect while ensuring the connection strength. For example, the length of each connecting portion 321 is 20 mm, 23 mm, 25 mm, etc.

[0070] Exemplarily, the width of the heat dissipation component 30 (i.e., the size of the heat dissipation component 30 in the height direction of the battery cell 20) is 10 mm to 20 mm. The width of the first heat-conducting layer 31 and the connecting layer 32 is equal to the width of the heat dissipation component 30. When multiple second heat-conducting layers 33 are provided, the width of a single second heat-conducting layer 33 is 2.5 mm to 5 mm. For example, the width of the heat dissipation component 30 is 10 mm, 15 mm, 20 mm, etc. The width of a single second heat-conducting layer 33 is 2.5 mm, 3 mm, 4 mm, 5 mm, etc.

[0071] Exemplarily, the thickness of the heat dissipation component 30 is 0.5 mm to 1 mm. For example, the thickness of the heat dissipation component 30 is 0.5 mm, 0.6 mm, 1 mm, etc. The thickness of the first heat conduction layer 31 is 0.4 mm to 0.7 mm. For example, the thickness of the first heat conduction layer 31 is 0.4 mm, 0.5 mm, 0.7 mm, etc. The thickness of the second heat conduction layer 33 is not greater than 0.1 mm. For example, the thickness of the second heat conduction layer 33 is 0.08 mm, 0.09 mm, etc. The thickness of the connection layer 32 is 0.1 mm to 0.2 mm. For example, the thickness of the connection layer 32 is 0.1 mm, 0.15 mm, 0.2 mm, etc.

[0072] It should be noted that the above structural parameters of the first heat conduction layer 31, the second heat conduction layer 33 and the connection layer 32 enable the deformation of the first heat conduction layer 31 during temperature change and the deformation of the heat dissipation component 30 to be overall deformation, approximately uniform shrinkage, so as to achieve the effect of increasing or decreasing the heat conduction area.

[0073] Optionally, the battery cell 20 has a first end, and the first end of the battery cell 20 has a tab 21. The heat dissipation component 30 is disposed between the circumferential outer wall of the first end of the battery cell 20 and the circumferential inner wall of the housing 10. Since the tab 21 is disposed at the first end, during the use of the battery, the temperature of the first end will be higher than other positions of the battery cell 20. By disposing the heat dissipation component 30 between the circumferential outer wall of the first end and the circumferential inner wall of the housing 10, targeted heat dissipation of the first end can be achieved, thereby preventing the problem of too high temperature at the first end, and further avoiding the problem of too high local temperature of the battery cell 20, and improving the service life of the battery cell 20.

[0074] It should be noted that one end of the battery cell 20 can be the first end, or both ends of the battery cell 20 can be the first end, and this embodiment does not limit this. When both ends of the battery cell 20 are the first end, two sets of heat dissipation components 30 are correspondingly provided, and the two sets of heat dissipation components 30 dissipate heat from the two first ends respectively.

[0075] Optionally, please refer to Figure 1 , the battery further includes a colloid 40 disposed on the circumferential outer wall of the battery cell 20. For example, the colloid 40 can be a terminal sealant, and the colloid 40 wraps around the middle of the battery cell 20 and is used to restrain the electrode plates of the battery cell 20. In the height direction of the battery cell 20, the heat dissipation component 30 is disposed between the colloid 40 and the end face of the battery cell 20 having the tab 21, so that the heat dissipation component 30 can directly contact the outer wall of the battery cell 20 instead of contacting the colloid 40, so as to have a smaller thermal resistance and thus improve the heat conduction efficiency.

[0076] For the battery provided in this embodiment, the heat dissipation component 30 is arranged between the battery cell 20 and the housing 10 and is in contact with the housing 10 and the battery cell 20, so as to dissipate the heat of the battery cell 20 to the outside of the battery through the housing 10. The positive and negative electrode tabs 21 of the tab layer (not shown in the figure) are respectively welded to the positive electrode terminal on the housing 10 and the cover plate assembly installed at one end of the housing 10 to connect the internal circuit. At this time, when the battery cell 20 is charged and discharged, the currents of the positive and negative electrode plates all converge near the tab layer, and the heat generated by the overcurrent is concentrated on the tab side of the battery cell 20. Therefore, in this embodiment, the heat dissipation component 30 is arranged at the upper end (i.e., the first end) of the tab side of the battery cell 20. Specifically, from the height direction of the battery cell 20, the heat dissipation structure is located between the colloid 40 and the tab 21. Therefore, heat dissipation is carried out in a timely manner through the heat dissipation component 30 with a high thermal conductivity coefficient.

[0077] In this embodiment, in the heat conduction state, the heat dissipation component 30 replaces the air heat conduction in the prior art by good contact heat conduction with the battery cell 20 and the housing 10, speeds up the heat dissipation speed, reduces local high temperature, effectively maintains the stability of the overall temperature field of the battery, and improves the battery life and safety. When the temperature drops to 10 °C or other lower values, the heat dissipation component 30 is stimulated by the temperature to contract and deform, separate from the housing 10 or the battery cell 20, or reduce the contact area, reduce the heat dissipation speed, and improve the temperature rising ability of the battery cell 20, thereby improving the low-temperature performance of the battery cell 20.

[0078] The battery provided in this embodiment has a relatively simple structure and low cost, and can be compatible with existing process equipment. By adding the heat dissipation component 30 between the battery cell 20 and the housing 10 and replacing the original air heat conduction with a material with a high thermal conductivity coefficient, the heat is quickly transferred layer by layer to the housing 10, improving the overall heat dissipation performance of the battery cell 20, balancing the internal temperature field of the battery cell 20, making the temperature gradient between the upper and lower parts of the battery cell 20 tend to be consistent, and reducing the long-term life problem and safety risk of the battery cell 20 caused by the heating problem. At low temperatures, the heat dissipation component 30 is stimulated by the temperature to deform and contract, reducing the contact area with the battery cell 20 and the housing 10, and the heat conduction ability decreases, so that the internal temperature of the battery cell 20 increases to improve the low-temperature performance.

[0079] This embodiment also provides an electrical device, including the battery as described above. The electrical device provided in this embodiment has high safety.

[0080] The electrical devices include, but are not limited to: mobile phones, portable devices, laptop computers, battery cars, electric vehicles, ships, spacecrafts, electric toys, and electric tools, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.; electric toys include fixed or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and electric tools for railways, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, percussion drills, concrete vibrators, and electric planers. The electrical devices include, but are not limited to: mobile phones, portable devices, laptop computers, battery cars, electric vehicles, ships, spacecrafts, electric toys, and electric tools, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.; electric toys include fixed or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and electric tools for railways, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, percussion drills, concrete vibrators, and electric planers.

[0081] Obviously, the above-mentioned embodiments of the present utility model are merely examples for clearly explaining the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A battery, comprising a housing (10) and a battery cell (20) placed in the housing (10), characterized in that: The battery also includes a heat dissipation component (30); The heat dissipation component (30) is arranged between the outer wall of the battery core (20) and the inner wall of the shell (10), and the heat dissipation component (30) is a temperature-dependent deformable structure; The heat dissipation component (30) has a heat conduction state and a contraction state. When the heat dissipation component (30) is in the heat conduction state, the heat dissipation component (30) is in contact with both the battery core (20) and the shell (10), and the sum of the contact areas of the heat dissipation component (30), the battery core (20) and the shell (10) is a first contact area. When the heat dissipation component (30) is in the contraction state, the sum of the contact areas of the heat dissipation component (30), the battery core (20) and the shell (10) is a second contact area, and the second contact area is smaller than the first contact area.

2. The battery according to claim 1, characterized in that When the heat dissipation component (30) is in the heat conduction state, the contact area between the heat dissipation component (30) and the battery core (20) and / or the housing (10) is positively correlated with the temperature.

3. The battery according to claim 1, characterized in that When the heat dissipation component (30) is in a contracted state, the heat dissipation component (30) contacts at most one of the battery core (20) and the housing (10).

4. The battery according to any one of claims 1 to 3, characterized in that: The heat dissipation component (30) comprises a first heat-conducting layer (31) and a second heat-conducting layer (33) which are stacked, and the thickness of the first heat-conducting layer (31) is positively correlated with the temperature; When the heat dissipation component (30) is in the heat conduction state, the first heat conduction layer (31) contacts one of the battery core (20) and the shell (10), and the second heat conduction layer (33) contacts the other of the battery core (20) and the shell (10).

5. The battery according to claim 4, characterized in that When the heat dissipation component (30) is in the heat conduction state, the first heat conduction layer (31) is in contact with the housing (10), the second heat conduction layer (33) is in contact with the battery core (20), and the thermal conductivity of the second heat conduction layer (33) is greater than the thermal conductivity of the first heat conduction layer (31).

6. The battery according to claim 4, characterized in that The heat dissipation component (30) further comprises a connection layer (32), wherein the connection layer (32) is connected between the first heat conducting layer (31) and the second heat conducting layer (33).

7. The battery according to claim 6, characterized in that The first heat-conducting layer (31) is provided with a first gap through which the connecting layer (32) is exposed, and the connecting layer (32) is bonded to the outer wall of the battery core (20) or the inner wall of the housing (10) through the first gap; and / or, The second heat-conducting layer (33) is provided with a second gap through which the connecting layer (32) is exposed, and the connecting layer (32) is bonded to the outer wall of the battery core (20) or the inner wall of the shell (10) through the second gap; and / or the connecting layer (32) includes a plurality of connecting portions (321), and the plurality of connecting portions (321) are arranged at intervals along the circumference of the battery core (20).

8. The battery according to any one of claims 1 to 3, characterized in that: The heat dissipation component (30) is connected to the outer wall of the battery core (20); or, the heat dissipation component (30) is connected to the inner wall of the shell (10); or, the heat dissipation component (30) is connected to both the outer wall of the battery core (20) and the inner wall of the shell (10), and the connection area between the heat dissipation component (30) and the outer wall of the battery core (20) is greater than or smaller than the connection area between the heat dissipation component (30) and the inner wall of the shell (10).

9. The battery according to any one of claims 1 to 3, characterized in that: The first end of the battery core (20) has a pole ear (21), and the heat dissipation component (30) is arranged between the circumferential outer wall of the first end of the battery core (20) and the circumferential inner wall of the shell (10).

10. An electrical device, characterized in that: Comprising a battery as claimed in any one of claims 1 to 9.

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