Single cell and battery pack

Abstract

The present application discloses a single cell battery and a battery pack. The heat equalizing element of the single cell battery includes a first heat exchange part and a second heat exchange part. At least one of the first heat exchange part and the second heat exchange part is arranged opposite to the wide surface of the battery cell. The first heat exchange cavity in the first heat exchange part and the second heat exchange cavity in the second heat exchange part are connected through a first one-way conducting channel and a second one-way conducting channel, respectively. The first one-way conducting channel is configured to allow the heat exchange fluid in the first heat exchange cavity to flow to the second heat exchange cavity, and the second one-way conducting channel is configured to allow the heat exchange fluid in the second heat exchange cavity to flow to the first heat exchange cavity. In other words, the present application provides a first one-way conducting channel and a second one-way conducting channel, so that the heat exchange fluid inside the heat equalizing element circulates efficiently, thereby improving the thermal conductivity of the heat equalizing element, which is beneficial to improving the temperature uniformity of different positions of the single cell battery.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a single cell and a battery pack. Background Art

[0002] Lithium-ion batteries are widely used in the fields of electric vehicles and energy storage due to their advantages such as high energy density, no memory, and long cycle life. The development trend of lithium-ion batteries is large capacity and high energy density, which causes the temperature difference at different positions of a single lithium-ion battery to increase with the increase in volume, affecting the safety and reliability of lithium-ion batteries. At present, a heat spreader is set on the surface of the lithium-ion battery shell to reduce the temperature difference at different positions of the lithium-ion battery. However, the current heat spreader has low thermal conductivity. Utility Model Content

[0003] The present application provides a single cell and a battery pack, which can improve the thermal conductivity of a heat spreader.

[0004] The present application provides a single cell battery. The single cell battery includes a shell having a housing cavity. The single cell battery also includes a battery cell, and the battery cell is housed in the housing cavity. The outer surface of the battery cell includes a first surface and a second surface spaced apart from each other, and a wide surface and a narrow surface connected between the first surface and the second surface, and the area of ​​the wide surface is greater than the area of ​​the narrow surface. The single cell battery also includes a heat equalizing member, and the heat equalizing member includes a first heat exchange portion, a second heat exchange portion, and a conduction portion, at least one of the first heat exchange portion and the second heat exchange portion is arranged opposite to the wide surface of the battery cell, and the first heat exchange portion and the second heat exchange portion are connected via the conduction portion. Among them, the first heat exchange part has a first heat exchange cavity inside, the second heat exchange part has a second heat exchange cavity inside, the conduction part has a first unidirectional conductive channel and a second unidirectional conductive channel inside, the first heat exchange cavity and the second heat exchange cavity are connected through the first unidirectional conductive channel and the second unidirectional conductive channel respectively, the first unidirectional conductive channel is configured to allow the heat exchange fluid in the first heat exchange cavity to flow to the second heat exchange cavity, and the second unidirectional conductive channel is configured to allow the heat exchange fluid in the second heat exchange cavity to flow to the first heat exchange cavity.

[0005] In one embodiment of the present application, the single cell battery has a first direction; the shell includes a shell body and a top cover, the top cover is arranged on the shell body, the top cover and the shell body cooperate to form a accommodating cavity, and the battery cell and the top cover are distributed along the first direction; wherein, the first unidirectional conductive channel and the second unidirectional conductive channel are distributed along the first direction.

[0006] In an embodiment of the present application, the number of the first unidirectional conductive channels and the number of the second unidirectional conductive channels are both plural, and the first unidirectional conductive channels and the second unidirectional conductive channels are alternately distributed one by one along the first direction.

[0007] In one embodiment of the present application, the heat equalizing element further includes: a partition, and the first heat exchange part and the conduction part are separated by the partition.

[0008] In one embodiment of the present application, the heat equalizing member also includes: a first main body portion and a second main body portion, the first main body portion and the second main body portion are arranged opposite to each other, and the first heat exchange chamber and the second heat exchange chamber are located between the first main body portion and the second main body portion; and a support column, a support column is arranged in the first heat exchange chamber and / or the second heat exchange chamber, and the support column is supported between the first main body portion and the second main body portion.

[0009] In one embodiment of the present application, the single cell has a first direction; the shell includes a shell body and a top cover, the top cover is arranged on the shell body, the top cover and the shell body cooperate to form a accommodating cavity, and the battery cell and the top cover are distributed along the first direction; the first surface and the second surface are distributed along the first direction; wherein, the first heat exchange part and the second heat exchange part are both arranged opposite to the wide surface; or, one of the first heat exchange part and the second heat exchange part is arranged opposite to the wide surface, and the other is arranged opposite to the narrow surface.

[0010] In one embodiment of the present application, the single cell battery also has a second direction and a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; the outer surface of the battery cell includes two wide surfaces distributed at intervals along the second direction and two narrow surfaces distributed at intervals along the third direction; wherein the first heat exchange portion and the second heat exchange portion are respectively arranged opposite to different wide surfaces.

[0011] In one embodiment of the present application, the number of second heat exchange parts and the number of conduction parts are both at least two, and the first heat exchange part is connected to each second heat exchange part through different conduction parts respectively; the first heat exchange part is arranged opposite to one of the two wide surfaces, and each second heat exchange part is arranged opposite to different areas of the other of the two wide surfaces.

[0012] In one embodiment of the present application, the first heat exchange portion is disposed opposite to the wide surface, and the second heat exchange portion is disposed opposite to the narrow surface.

[0013] In one embodiment of the present application, the number of battery cells is at least two, the battery cells are distributed at intervals, and the first heat exchange part is located between two adjacent battery cells.

[0014] Correspondingly, the present application also provides a battery pack, including a box body and a single battery as described in the above embodiment, wherein the single battery is accommodated in the box body.

[0015] The beneficial effects of the present application are as follows: Different from the prior art, the present application provides a single cell and a battery pack. The heat equalizing element of the single cell includes a first heat exchange part and a second heat exchange part. At least one of the first heat exchange part and the second heat exchange part is arranged opposite to the wide surface of the battery cell. The first heat exchange cavity in the first heat exchange part and the second heat exchange cavity in the second heat exchange part are connected through a first one-way conducting channel and a second one-way conducting channel, respectively. The first one-way conducting channel is configured to allow the heat exchange fluid in the first heat exchange cavity to flow to the second heat exchange cavity, and the second one-way conducting channel is configured to allow the heat exchange fluid in the second heat exchange cavity to flow to the first heat exchange cavity. In other words, the present application provides a first one-way conducting channel and a second one-way conducting channel, so that the heat exchange fluid inside the heat equalizing element circulates efficiently, thereby improving the thermal conductivity of the heat equalizing element, which is beneficial to improving the temperature uniformity of different positions of the single cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a structural schematic diagram of an embodiment of a single cell of the present application;

[0018] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure of a single cell in the AA direction is shown;

[0019] Figure 3 yes Figure 1 A schematic diagram of the top view of the structure of the single cell shown;

[0020] Figure 4 yes Figure 3 A schematic diagram of the cross-sectional structure of a single battery in the BB direction is shown;

[0021] Figure 5 It is a structural schematic diagram of an embodiment of a battery cell of the present application;

[0022] Figure 6 It is a structural schematic diagram of an embodiment of a heat equalizing element of the present application;

[0023] Figure 7 yes Figure 6 A schematic diagram of the cross-sectional structure of the heat spreader in the CC direction is shown;

[0024] Figure 8 yes Figure 7 The structural schematic diagram of the heat spreader D area is shown;

[0025] Fig. 9 This is a schematic structural diagram of an embodiment of a battery cell and a heat spreader of the present application;

[0026] Fig.10 yes Fig. 9 A schematic diagram of the structure of the battery cell and the heat spreader E area shown;

[0027] Fig.11 It is a structural schematic diagram of another embodiment of the battery cell and the heat spreader of the present application;

[0028] Fig.12 yes Fig.11 Schematic diagram of the structure of the battery cell and the heat spreader F area.

[0029] Description of reference numerals:

[0030] 10 single battery; 11 shell; 111 accommodating cavity; 112 shell body; 113 top cover; 12 battery cell; 121 first side; 122 second side; 123 wide side; 124 narrow side; 13 heat spreader; 131 first heat exchange part; 1311 first heat exchange cavity; 132 second heat exchange part; 1321 second heat exchange cavity; 133 conduction part; 1331 first one-way conducting channel; 1332 second one-way conducting channel; 134 partition; 1351 first main body; 1352 second main body; 136 support column. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application and are not used to limit the present application. In the present application, unless otherwise stated, the directional words used, such as "up", "down", "left", and "right", generally refer to the up, down, left, and right of the device in actual use or working state, specifically the drawing direction in the accompanying drawings.

[0032] In this application, unless otherwise clearly specified and limited, the terms "connected", "connected", "stacked" and the like should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] The present application provides a single cell and a battery pack, which are described in detail below. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0034] In order to solve the technical problem of low thermal conductivity of heat spreader in the prior art, one embodiment of the present application provides a single cell. The single cell includes a shell having a receiving cavity. The single cell also includes a battery cell, and the battery cell is received in the receiving cavity. The outer surface of the battery cell includes a first surface and a second surface spaced apart from each other, and a wide surface and a narrow surface connected between the first surface and the second surface, and the area of ​​the wide surface is greater than the area of ​​the narrow surface. The single cell also includes a heat spreader, and the heat spreader includes a first heat exchange portion, a second heat exchange portion, and a conduction portion, and at least one of the first heat exchange portion and the second heat exchange portion is arranged opposite to the wide surface of the battery cell, and the first heat exchange portion and the second heat exchange portion are connected via the conduction portion. The first heat exchange part has a first heat exchange cavity inside, the second heat exchange part has a second heat exchange cavity inside, the conduction part has a first one-way conducting channel and a second one-way conducting channel inside, the first heat exchange cavity and the second heat exchange cavity are connected through the first one-way conducting channel and the second one-way conducting channel respectively, the first one-way conducting channel is configured to allow the heat exchange fluid in the first heat exchange cavity to flow to the second heat exchange cavity, and the second one-way conducting channel is configured to allow the heat exchange fluid in the second heat exchange cavity to flow to the first heat exchange cavity. The following is a detailed description.

[0035] See also Figure 1 , Figure 1 It is a schematic structural diagram of an embodiment of a single cell of the present application.

[0036] In one embodiment, the battery pack includes a box and a plurality of single cells 10, and the plurality of single cells 10 are arranged in the box. The single cells 10 include but are not limited to lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., which are not limited in the embodiments of the present disclosure. The battery pack is a power supply for electrical devices. Electrical devices can be mobile phones, portable devices, laptops, battery cars, electric cars, ships, spacecraft, electric toys and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0037] For details, please refer to Figures 2 to 4The single battery 10 includes a shell 11, and the shell 11 has a receiving cavity 111. The single battery 10 also includes a battery cell 12, and the battery cell 12 is received in the receiving cavity 111. The battery cell 12 is formed by stacking or winding pole pieces and diaphragms. The single battery 10 has a first direction Z. The shell 11 includes a shell body 112 and a top cover 113, and the top cover 113 is covered on the shell body 112. The top cover 113 and the shell body 112 cooperate to enclose the receiving cavity 111, and the battery cell 12 and the top cover 113 are distributed along the first direction Z.

[0038] Please also read Figure 5 , the single cell 10 also has a second direction X and a third direction Y, and the first direction Z, the second direction X and the third direction Y are perpendicular to each other. The outer surface of the battery cell 12 includes a first surface 121 and a second surface 122 distributed along the first direction Z. The outer surface of the battery cell 12 also includes a side surface connected between the first surface 121 and the second surface 122. In the case of a single-sided pole ear of the battery cell 12, the pole ear is arranged on the first surface 121; in the case of a double-sided pole ear of the battery cell 12, the first surface 121 and the second surface 122 are respectively provided with pole ears. The embodiment of the present application is described by taking the single-sided pole ear of the battery cell 12 as an example, which is only for the purpose of discussion and is not limited thereto. The side surface of the battery cell 12 includes two wide surfaces 123 distributed at intervals along the second direction X and two narrow surfaces 124 distributed at intervals along the third direction Y. The area of ​​the wide surface 123 is larger than the area of ​​the narrow surface 124.

[0039] Please also read Figure 6 , Figure 6 It is a structural schematic diagram of an embodiment of a heat equalizing element of the present application.

[0040] In one embodiment, the single battery 10 further includes a heat spreader 13 . The heat spreader 13 is disposed on the outer surface of the battery core 12 to reduce the temperature difference at different positions of the single battery 10 , which is beneficial to improve the temperature uniformity at different positions of the single battery 10 .

[0041] Specifically, the heat equalizing member 13 includes a first heat exchange portion 131, a second heat exchange portion 132 and a conduction portion 133, and the first heat exchange portion 131 and the second heat exchange portion 132 are connected through the conduction portion 133. At least one of the first heat exchange portion 131 and the second heat exchange portion 132 is arranged opposite to the wide surface 123 of the battery cell 12. For example, the first heat exchange portion 131 and the second heat exchange portion 132 are respectively arranged opposite to different wide surfaces 123 of the battery cell 12, or the first heat exchange portion 131 and the second heat exchange portion 132 are respectively arranged opposite to the wide surface 123 and the narrow surface 124 of the battery cell 12, or the first heat exchange portion 131 and the second heat exchange portion 132 are respectively arranged opposite to the wide surface 123 and the second surface 122 of the battery cell 12, etc., which will be explained below.

[0042] The first heat exchange part 131 has a first heat exchange cavity 1311 inside, the second heat exchange part 132 has a second heat exchange cavity 1321 inside, and the conductive part 133 has a first one-way conducting channel 1331 and a second one-way conducting channel 1332 inside. The first heat exchange cavity 1311 and the second heat exchange cavity 1321 are connected respectively through the first one-way conducting channel 1331 and the second one-way conducting channel 1332. The first one-way conducting channel 1331 is configured to allow the heat exchange fluid in the first heat exchange cavity 1311 to flow to the second heat exchange cavity 1321 and restrict the heat exchange fluid in the second heat exchange cavity 1321 from flowing to the first heat exchange cavity 1311. The second one-way conducting channel 1332 is configured to allow the heat exchange fluid in the second heat exchange cavity 1321 to flow to the first heat exchange cavity 1311 and restrict the heat exchange fluid in the first heat exchange cavity 1311 from flowing to the second heat exchange cavity 1321.

[0043] Through the above method, this embodiment sets the first one-way conducting channel 1331 and the second one-way conducting channel 1332, so that the heat exchange fluid inside the heat equalizing element 13 can circulate efficiently. The first one-way conducting channel 1331 and the second one-way conducting channel 1332 can suppress the backflow of the heat exchange fluid and affect the thermal conductivity efficiency, thereby improving the thermal conductivity efficiency of the heat equalizing element 13, which is beneficial to improving the temperature uniformity of different positions of the single cell 10.

[0044] In one embodiment, the first heat exchange portion 131 and the second heat exchange portion 132 are respectively disposed opposite to the side surfaces of the battery core 12 in different directions. In other words, the first heat exchange portion 131 and the second heat exchange portion 132 may both be disposed opposite to the wide surface 123; or, one of the first heat exchange portion 131 and the second heat exchange portion 132 is disposed opposite to the wide surface 123, and the other is disposed opposite to the narrow surface 124.

[0045] Specifically, the first heat exchange portion 131 and the second heat exchange portion 132 are respectively disposed opposite to different wide surfaces 123 of the battery core 12. That is, the first heat exchange portion 131 covers one wide surface 123 of the battery core 12, the second heat exchange portion 132 covers the other wide surface 123 of the battery core 12, and the conduction portion 133 covers the narrow surface 124 of the battery core 12.

[0046] Exemplarily, the number of the battery cells 12 is at least two. Figure 2 The example shows that there are two battery cells 12. The battery cells 12 are spaced apart along the second direction X, the first heat exchange portion 131 is located between two adjacent battery cells 12, and the second heat exchange portion 132 is arranged opposite to the wide surface 123 of the corresponding battery cell 12 facing away from the adjacent battery cell 12. The number of the second heat exchange portion 132 and the number of the conduction portion 133 are both at least two. Figure 2 and Figure 4The example shows the case where the number of the second heat exchange parts 132 and the number of the conduction parts 133 are both two. The first heat exchange part 131 is connected to each second heat exchange part 132 through different conduction parts 133. The first heat exchange part 131 is arranged opposite to one of the two wide faces 123 of the battery cell 12, and each second heat exchange part 132 is arranged opposite to a different area of ​​the other wide face 123 of the two wide faces 123. A thermal management component is arranged on the outside of the single cell 10, and the thermal management component is arranged relative to the wide face 123 on the outside of the battery cell 12, that is, the single cell 10 of this embodiment applies a thermal management strategy of heat exchange of the wide face 123. The heat exchange fluid can be a phase change material or the like.

[0047] In heat dissipation conditions (such as high-rate charging and discharging of single cells 10, etc.), since the heat between adjacent battery cells 12 is difficult to dissipate, the temperature of the outer surface of the battery cell 12 corresponding to the first heat exchange part 131 is higher than the temperature of the outer surface of the battery cell 12 corresponding to the second heat exchange part 132. At this time, the first heat exchange part 131 is an evaporation zone, and the second heat exchange part 132 is a condensation zone. The heat exchange fluid in the first heat exchange part 131 absorbs heat and vaporizes and flows to the second heat exchange cavity 1321 through the first unidirectional conductive channel 1331, and the heat exchange fluid in the second heat exchange part 132 releases heat and liquefies and flows to the first heat exchange cavity 1311 through the second unidirectional conductive channel 1332, and so on. In this condition, the heat equalizing member 13 conducts the heat inside the battery cell 12 to the outside, and while ensuring the temperature uniformity of different positions of the single cell 10, it also dissipates the heat of the single cell 10 through the external thermal management component, thereby ensuring the safety and reliability of the single cell 10.

[0048] In the heating condition (for example, the single cell 10 works in a low temperature environment, etc.), the temperature of the outer surface of the battery cell 12 corresponding to the second heat exchange part 132 is higher than the temperature of the outer surface of the battery cell 12 corresponding to the first heat exchange part 131. At this time, the second heat exchange part 132 is an evaporation zone, and the first heat exchange part 131 is a condensation zone. The heat exchange fluid in the second heat exchange part 132 absorbs heat and vaporizes and flows to the first heat exchange cavity 1311 through the second unidirectional conductive channel 1332. The heat exchange fluid in the first heat exchange part 131 releases heat and liquefies and flows to the second heat exchange cavity 1321 through the first unidirectional conductive channel 1331, and the cycle repeats. In this condition, the heat equalizing member 13 conducts the heat provided by the external thermal management component to the adjacent battery cells 12. While ensuring the temperature uniformity of different positions of the single cell 10, the single cell 10 is also heated by the external thermal management component, thereby ensuring that the single cell 10 works stably and reliably in a low temperature environment.

[0049] In one embodiment, the first unidirectional conductive channels 1331 and the second unidirectional conductive channels 1332 are distributed along the first direction Z. In an exemplary embodiment, the number of the first unidirectional conductive channels 1331 and the number of the second unidirectional conductive channels 1332 are both plural, and each of the first unidirectional conductive channels 1331 and each of the second unidirectional conductive channels 1332 are alternately distributed along the first direction Z, such as Figure 6 Of course, in other embodiments of the present application, each first one-way conducting channel 1331 may be located on the upper side of each second one-way conducting channel 1332 in the first direction Z, or each first one-way conducting channel 1331 may be located on the lower side of each second one-way conducting channel 1332 in the first direction Z, which is not limited here.

[0050] In one embodiment, the heat equalizing member 13 further includes a partition 134. The first heat exchange portion 131 is separated from the conduction portion 133 by the partition 134, and the second heat exchange portion 132 is also separated from the conduction portion 133 by the partition 134. In this way, it is ensured that the heat exchange fluid flows through the first unidirectional conduction channel 1331 and the second unidirectional conduction channel 1332 in the conduction portion 133.

[0051] In one embodiment, the heat equalizing member 13 further includes a first main body 1351 and a second main body 1352, the first main body 1351 and the second main body 1352 are arranged opposite to each other, and the first heat exchange cavity 1311 and the second heat exchange cavity 1321 are located between the first main body 1351 and the second main body 1352. The heat equalizing member 13 further includes a support column 136, the support column 136 is arranged in the first heat exchange cavity 1311 and / or the second heat exchange cavity 1321, and the support column 136 is supported between the first main body 1351 and the second main body 1352. Specifically, the support column 136 is arranged in the first heat exchange cavity 1311 and the second heat exchange cavity 1321, and the support column 136 is used to maintain the first heat exchange cavity 1311 and the second heat exchange cavity 1321, so as to ensure that the first heat exchange portion 131 and the second heat exchange portion 132 can realize the heat exchange function.

[0052] It should be noted that the material of the heat spreader 13 can be a metal material with a high thermal conductivity, such as copper, etc., to ensure the thermal conductivity of the heat spreader 13. In addition, the outer surface of the heat spreader 13 is surface treated with a corrosion-resistant insulating material to prevent the positive and negative electrodes of the battery cell 12 from short-circuiting. The insulating material also has good thermal conductivity, such as boron nitride, aluminum nitride, aluminum oxide, etc. The thickness of the heat spreader 13 can be 0.1mm to 0.5mm, such as 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc. The first unidirectional conduction channel 1331 and the second unidirectional conduction channel 1332 can be a Tesla valve, a one-way valve, etc. The unidirectional conduction principle of the first unidirectional conduction channel 1331 and the second unidirectional conduction channel 1332 belongs to the understanding of those skilled in the art, so it will not be repeated here.

[0053] Please also read Fig. 9 and Fig.10 , Fig. 9 It is a structural schematic diagram of an embodiment of a battery cell and a heat spreader of the present application. Fig.10 yes Fig. 9 Schematic diagram of the structure of the battery cell and the heat spreader E area.

[0054] In an alternative embodiment, the difference between this embodiment and the above embodiment is that the first heat exchange portion 131 of the heat equalizing member 13 is arranged opposite to the wide surface 123 of the battery cell 12, and the second heat exchange portion 132 is arranged opposite to the narrow surface 124 of the battery cell 12. That is, the first heat exchange portion 131 covers one of the wide surfaces 123 of the battery cell 12, and the second heat exchange portion 132 covers one of the narrow surfaces 124 of the battery cell 12. In this way, this embodiment is adapted to the thermal management strategy of applying heat exchange of the narrow surface 124 of the single cell 10, specifically, the external thermal management component is arranged relative to the narrow surface 124 of the battery cell 12.

[0055] Please also read Fig.11 and Fig.12 , Fig.11 is a structural schematic diagram of another embodiment of the battery cell and the heat spreader of the present application, Fig.12 yes Fig.11 Schematic diagram of the structure of the battery cell and the heat spreader F area.

[0056] In another alternative embodiment, the difference between this embodiment and the above embodiment is that the first heat exchange part 131 of the heat equalizing member 13 is arranged opposite to the wide surface 123 of the battery cell 12, and the second heat exchange part 132 is arranged opposite to the second surface 122 of the battery cell 12. That is, the first heat exchange part 131 covers one of the wide surfaces 123 of the battery cell 12, and the second heat exchange part 132 covers the second surface 122 at the bottom of the battery cell 12. In this way, this embodiment is adapted to the thermal management strategy of bottom heat exchange applied to the single cell 10, specifically, the external thermal management component is arranged relative to the second surface 122 of the battery cell 12.

[0057] Of course, in other embodiments of the present application, the first heat exchange portion 131 and the second heat exchange portion 132 may be respectively arranged relative to different regions of the same wide surface 123. In an exemplary embodiment, the first heat exchange portion 131 is arranged relative to the middle region of the wide surface 123, and the second heat exchange portion 132 is arranged relative to the edge region of the wide surface 123. Since it is difficult for the middle of the battery cell 12 to exchange heat with the outside, the first heat exchange portion 131 and the second heat exchange portion 132 in this embodiment can reduce the temperature difference at different positions of the same wide surface 123 of the battery cell 12, which is beneficial to improving the temperature uniformity at different positions of the single battery 10, which is not limited here.

[0058] In summary, the present application provides a single cell battery and a battery pack. The heat equalizing element of the single cell battery includes a first heat exchange part and a second heat exchange part. At least one of the first heat exchange part and the second heat exchange part is arranged opposite to the wide surface of the battery cell. The first heat exchange cavity in the first heat exchange part and the second heat exchange cavity in the second heat exchange part are connected through a first one-way conducting channel and a second one-way conducting channel, respectively. The first one-way conducting channel is configured to allow the heat exchange fluid in the first heat exchange cavity to flow to the second heat exchange cavity, and the second one-way conducting channel is configured to allow the heat exchange fluid in the second heat exchange cavity to flow to the first heat exchange cavity. In other words, the present application provides a first one-way conducting channel and a second one-way conducting channel so that the heat exchange fluid inside the heat equalizing element circulates efficiently, thereby improving the thermal conductivity of the heat equalizing element, which is beneficial to improving the temperature uniformity of different positions of the single cell battery. The heat equalizing element of the present application is light in weight, which is beneficial to the lightweight design of the single cell battery and the battery pack. Furthermore, the method of setting up the heat spreader in the present application has little impact on the existing production process of the single battery and the battery pack, the heat spreader is easy to manufacture and has high manufacturability.

[0059] The single cell battery and battery pack provided by the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for general technicians in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A single cell battery, characterized in that: include: A housing having a receiving cavity; A battery cell is accommodated in the accommodation cavity; the outer surface of the battery cell includes a first surface and a second surface spaced apart from each other, and a wide surface and a narrow surface connected between the first surface and the second surface, and the area of ​​the wide surface is larger than the area of ​​the narrow surface; and The heat equalizing member comprises a first heat exchange portion, a second heat exchange portion and a conduction portion, wherein at least one of the first heat exchange portion and the second heat exchange portion is arranged opposite to the wide surface of the battery core, and the first heat exchange portion and the second heat exchange portion are connected via the conduction portion; Among them, the first heat exchange part has a first heat exchange cavity inside, the second heat exchange part has a second heat exchange cavity inside, the conduction part has a first unidirectional conduction channel and a second unidirectional conduction channel inside, the first heat exchange cavity is connected to the second heat exchange cavity through the first unidirectional conduction channel and the second unidirectional conduction channel respectively, the first unidirectional conduction channel is configured to allow the heat exchange fluid in the first heat exchange cavity to flow to the second heat exchange cavity, and the second unidirectional conduction channel is configured to allow the heat exchange fluid in the second heat exchange cavity to flow to the first heat exchange cavity.

2. The single cell according to claim 1, characterized in that: The single battery has a first direction; the shell includes a shell body and a top cover, the top cover is arranged on the shell body, the top cover and the shell body cooperate to enclose the accommodating cavity, and the battery cell and the top cover are distributed along the first direction; Wherein, the first unidirectional conductive channel and the second unidirectional conductive channel are distributed along the first direction.

3. The single cell according to claim 2, characterized in that: The number of the first one-way conducting channels and the number of the second one-way conducting channels are both plural, and the first one-way conducting channels and the second one-way conducting channels are alternately distributed one by one along the first direction.

4. The single cell according to claim 1, characterized in that: The heat-sparging member further comprises: A partition is provided, wherein the first heat exchange part and the conduction part are separated from each other as well as the second heat exchange part and the conduction part are separated from each other by the partition.

5. The single cell according to claim 1, characterized in that: The heat-sparging member further comprises: A first main body portion and a second main body portion, wherein the first main body portion and the second main body portion are arranged opposite to each other, and the first heat exchange cavity and the second heat exchange cavity are located between the first main body portion and the second main body portion; and A support column is provided in the first heat exchange cavity and / or the second heat exchange cavity, and the support column is supported between the first main body portion and the second main body portion.

6. The single cell according to claim 1, characterized in that: The single battery has a first direction; the shell includes a shell body and a top cover, the top cover is arranged on the shell body, the top cover and the shell body cooperate to enclose the accommodating cavity, and the battery cell and the top cover are distributed along the first direction; the first surface and the second surface are distributed along the first direction; Wherein, both the first heat exchange part and the second heat exchange part are arranged opposite to the wide surface; or, one of the first heat exchange part and the second heat exchange part is arranged opposite to the wide surface, and the other is arranged opposite to the narrow surface.

7. The single cell according to claim 6, characterized in that: The single cell also has a second direction and a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; the outer surface of the battery cell includes two wide surfaces spaced apart along the second direction and two narrow surfaces spaced apart along the third direction; Wherein, the first heat exchange part and the second heat exchange part are respectively arranged opposite to different wide surfaces.

8. The single cell according to claim 7, characterized in that: The number of the second heat exchange parts and the number of the conduction parts are both at least two, and the first heat exchange part is connected to each of the second heat exchange parts through different conduction parts; the first heat exchange part is arranged opposite to one of the two wide surfaces, and each of the second heat exchange parts is arranged opposite to different areas of the other of the two wide surfaces.

9. The single cell according to claim 6, characterized in that: The first heat exchange portion is disposed opposite to the wide surface, and the second heat exchange portion is disposed opposite to the narrow surface.

10. The single cell according to any one of claims 1 to 9, characterized in that: The number of the battery cells is at least two, the battery cells are spaced apart, and the first heat exchange portion is located between two adjacent battery cells.

11. A battery pack, characterized in that: The invention comprises a box body and a single cell according to any one of claims 1 to 10, wherein the single cell is accommodated in the box body.

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