A battery cell and a battery pack

Abstract

This application provides a battery cell and a battery pack. The battery cell includes a casing, an electrode assembly, and a cooling element. The casing has a receiving cavity. The electrode assembly is disposed within the receiving cavity. The cooling element is at least partially disposed within the receiving cavity. The battery cell of this application embodiment can effectively cool its interior using the cooling element, thereby improving the overall temperature uniformity of the cooled battery cell and better preventing localized overheating.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell and a battery pack. Background Technology

[0002] In related technologies, the cooling method of battery packs is generally to set up cooling structures such as cold plates on the outside of the battery cells. However, as the fast charging capability of battery packs continues to improve, the charging current is getting larger and larger. Under high current, the temperature of the battery pack will inevitably rise significantly. The cooling effect of the cooling methods in related technologies is becoming more and more limited. The temperature difference between the inside and the outside of the battery cell is large, and the battery cell is prone to local overheating, which leads to a decrease in the cycle performance of the battery pack and a reduction in its lifespan. Utility Model Content

[0003] This application aims to provide a battery cell and a battery pack to solve the technical problem that cooling methods in related technologies can easily lead to excessively high local temperatures in battery cells.

[0004] To achieve the above objectives, one embodiment of this application provides a single battery cell, comprising:

[0005] A shell with a receiving cavity;

[0006] Electrode assembly disposed within the receiving cavity;

[0007] A cooling element, which is at least partially disposed within the receiving cavity.

[0008] In one embodiment, the cooling element is provided with at least one cooling channel, the cooling channel having a channel inlet and a channel outlet.

[0009] In one embodiment, the number of cooling channels is multiple, and the multiple cooling channels are spaced apart along a first direction of the receiving cavity.

[0010] In one embodiment, the cooling element has a medium inlet and an inlet channel, the inlet channel being connected to the medium inlet and the inlet of each of the cooling channels; and / or,

[0011] The cooling component has a medium outlet and an outlet channel, and the outlet channel is connected to the medium outlet and the outlet of each of the cooling channels.

[0012] In one embodiment, the plurality of cooling channels are located on the same side of the input channel, and the medium inlet is located on the side of the input channel opposite to or adjacent to the plurality of cooling channels.

[0013] In one embodiment, the input channel includes a first input section and a second input section. A plurality of cooling channels are located on the same side of the first input section along the first direction. The medium inlet is located on the side of the first input section opposite to the plurality of cooling channels along the first direction. The second input section extends between the two opposite sides of the receiving cavity along the first direction. The first input section communicates with both the medium inlet and the second input section, and the second input section communicates with the inlet of each cooling channel. Alternatively,

[0014] The input channel extends between the two opposite sides of the receiving cavity along the first direction, and the plurality of cooling channels are located on the same side of the input channel. The medium inlet is located on the side of the input channel opposite to or adjacent to the plurality of cooling channels.

[0015] In one embodiment, the plurality of cooling channels are located on the same side of the output channel, and the medium outlet is located on the side of the output channel opposite to or adjacent to the plurality of cooling channels.

[0016] In one embodiment, the output channel includes a first output section and a second output section, a plurality of cooling channels are located on the same side of the first output section along the first direction, the medium outlet is located on the side of the first output section opposite to the plurality of cooling channels along the first direction, the second output section extends between the two opposite sides of the receiving cavity along the first direction, the first output section communicates with the medium outlet and the second output section respectively, and the second output section communicates with the channel inlet of each of the cooling channels respectively; or,

[0017] The output channel extends between the two opposite sides of the receiving cavity along the first direction, and the plurality of cooling channels are located on the same side of the output channel. The medium outlet is located on the side of the output channel opposite to or adjacent to the plurality of cooling channels.

[0018] In one embodiment, the housing includes a first connector having a first communication port and a second connector having a second communication port; the cooling component is disposed within the receiving cavity and has the medium inlet, the input channel, the medium outlet, and the output channel; the medium inlet communicates with the first communication port, and the medium outlet communicates with the second communication port; or,

[0019] The cooling component includes a first protrusion having the medium inlet, a second protrusion having the medium outlet, and a main body having the input channel, the output channel, and a plurality of cooling channels. The main body is disposed within the receiving cavity, and the first protrusion and the second protrusion are respectively disposed through the outer shell.

[0020] In one embodiment, the cooling element has the medium inlet, the inlet channel, the medium outlet, and the outlet channel;

[0021] The medium inlet and the medium outlet are located on the same side of the cooling element; or,

[0022] The medium inlet and the medium outlet are respectively located on opposite sides of the cooling component.

[0023] In one embodiment, the outer casing has a pressure relief port communicating with the receiving cavity, the battery cell includes an explosion-proof valve disposed at the pressure relief port, the medium inlet and the medium outlet are disposed on the same side of the cooling element and are respectively located on opposite sides of the explosion-proof valve.

[0024] In one embodiment, the cooling element has a plurality of media inlets on one side along a second direction perpendicular to the first direction, and the plurality of media inlets are spaced apart along the first direction; and / or,

[0025] The cooling component has a plurality of medium outlets on one side along a second direction perpendicular to the first direction, and the plurality of medium outlets are spaced apart along the first direction.

[0026] In one embodiment, each of the cooling channels extends between opposite sides of the receiving cavity along a second direction;

[0027] At least a portion of the cooling element is disposed inside the electrode assembly; or,

[0028] The electrode assembly is disposed on at least one of the opposite sides of the cooling element along a third direction of the receiving cavity;

[0029] The first direction, the second direction, and the third direction are perpendicular to each other.

[0030] In one embodiment, the thickness of the portion of the cooling element located within the receiving cavity along the third direction is 1 mm to 5 mm; and / or,

[0031] The portion of the cooling element located within the receiving cavity and the projected area of ​​the electrode assembly on a projection plane perpendicular to the third direction are respectively a first area and a second area, wherein the first area is 95% to 100% of the second area.

[0032] In one embodiment, the battery cell includes at least two terminals disposed on the housing, each terminal being electrically connected to the electrode assembly;

[0033] Each of the aforementioned poles is disposed on the same side of the outer casing along the first direction; or,

[0034] Each of the poles is respectively disposed on opposite sides of the outer casing along a second direction perpendicular to the first direction.

[0035] Another embodiment of this application provides a battery pack including the battery cells described above.

[0036] This application provides a battery cell and a battery pack. By at least partially placing a cooling element within the housing cavity of the battery cell, the internal temperature of the battery cell can be reduced, and the temperature difference between the internal and external surfaces of the battery cell can be reduced. This improves the overall temperature uniformity of the cooled battery cell and effectively prevents the problem of localized overheating of the battery cell. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application;

[0038] Figure 2 for Figure 1 The cross-sectional view of the battery cell shown in the figure indicates the flow direction of the cooling medium by the arrows located inside the cooling component.

[0039] Figure 3 for Figure 2 A cross-sectional view of the cooling component shown;

[0040] Figure 4 for Figure 1 A cross-sectional view of the battery cell from another perspective;

[0041] Figure 5 This is a cross-sectional view of a second type of battery cell according to an embodiment of this application. The arrows inside the cooling element in the figure indicate the flow direction of the cooling medium.

[0042] Figure 6 This is a cross-sectional view of a third type of battery cell according to an embodiment of this application. The arrows inside the cooling element in the figure indicate the flow direction of the cooling medium.

[0043] Explanation of reference numerals in the attached figures

[0044] 10. Outer shell; 10a. Receiving cavity; 11. Shell; 12. Cover plate; 13. First connector; 13a. First connecting port; 14. Second connector; 14a. Second connecting port; 20. Electrode assembly; 30. Cooling component; 30a. Medium inlet; 30b. Medium outlet; 30c. Cooling channel; 30c1. Channel inlet; 30c2. Channel outlet; 30d. Input channel; 30d1. First input section; 30d2. Second input section; 30e. Output channel; 30e1. First output section; 30e2. Second output section; 31. First protrusion; 32. Second protrusion; 33. Main body; 40. Electrode post; 50. Explosion-proof valve. Detailed Implementation

[0045] In the description of the embodiments in this application, it should be noted that the term "first direction" refers to the direction based on the attached... Figure 2 , Figure 4 , Figure 5 and Figure 6 The directions or positional relationships shown, "second direction" is based on the attached... Figure 2 , Figure 5 and Figure 6 The orientation or positional relationship shown, "third direction" is based on the attached Figure 4 The orientation or positional relationship shown is only for the convenience of describing the embodiments of this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of this application.

[0046] This application provides a battery pack, which includes, but is not limited to, a lithium battery pack. Please refer to... Figures 1 to 4 The battery pack consists of individual battery cells, which can be one or more.

[0047] Please see Figures 1 to 4 The battery cell in this application embodiment includes a housing 10, an electrode assembly 20, and a cooling component 30.

[0048] The housing 10 has a receiving cavity 10a, in which the electrode assembly 20 is disposed. The cooling element 30 is at least partially disposed within the receiving cavity 10a.

[0049] Specifically, please refer to Figure 1 and Figure 2 The outer casing 10 may include a cover plate 12 and a housing 11. The housing 11 has a receiving cavity 10a and an opening communicating with the receiving cavity 10a. The cover plate 12 is placed over the opening.

[0050] The electrode assembly 20 includes a positive electrode and a negative electrode. The positive electrode and the negative electrode can be wound or stacked. A separator can also be provided between the positive electrode and the negative electrode.

[0051] The number of electrode assemblies 20 can be one or more.

[0052] The cooling element 30 is used to cool down the battery cells. The cooling element 30 may have only a part of its structure set in the receiving cavity 10a, or the entire structure of the cooling element 30 may be set in the receiving cavity 10a.

[0053] The cooling component 30 is generally made of a material with good thermal conductivity. For example, the material of the cooling component 30 may include at least aluminum, which has high thermal conductivity, good ductility, and is not easily damaged after appropriate compression.

[0054] The cooling element 30 is at least partially disposed within the receiving cavity 10a, which can cool the battery cell inside the battery cell, thereby effectively reducing the internal temperature of the battery cell and reducing the temperature difference between the internal and external surfaces of the battery cell. This can improve the overall temperature uniformity of the cooled battery cell, better prevent the problem of local overheating of the battery cell, and thus also help improve the cycle performance and service life of the battery cell.

[0055] In addition, for battery packs using battery cells according to the embodiments of this application, cooling structures such as cold plates on the outside of the battery cells can be eliminated, thereby simplifying the structural design of the battery pack.

[0056] In one embodiment, please refer to Figure 2 and Figure 3 The cooling component 30 may be provided with at least one cooling channel 30c.

[0057] Cooling channel 30c is a passage for the flow of cooling medium, which can be gaseous or liquid. Cooling channel 30c has a channel inlet 30c1 and a channel outlet 30c2. Channel inlet 30c1 is the entrance for the cooling medium into cooling channel 30c, and channel outlet 30c2 is the exit for the cooling medium from cooling channel 30c. The number of cooling channels 30c can be one or more. When there are multiple cooling channels 30c, the number can be two or more.

[0058] The battery cell has a cooling pipe on its exterior. When there is only one cooling channel 30c, the cooling medium flowing along the cooling pipe enters the cooling channel 30c from the channel inlet 30c1 and flows out from the channel outlet 30c2, and then flows back into the cooling pipe.

[0059] When there are multiple cooling channels 30c, the cooling medium flowing along the cooling pipe enters the corresponding cooling channel 30c from the channel inlet 30c1 of each cooling channel 30c, then flows out from the channel outlet 30c2 of the corresponding cooling channel 30c, and flows back into the cooling pipe.

[0060] For battery packs that eliminate cooling structures such as cold plates, the cooling pipes that work with the cooling structures such as cold plates can be retained. It is only necessary to connect the inlet 30c1 and outlet 30c2 of each cooling channel 30c to the cooling pipes, which can further simplify the structural design of the battery pack.

[0061] Since the cooling channel 30c is located inside the housing cavity 10a of the battery cell's outer casing 10, the cooling medium can absorb heat from the battery cell through thermal conduction by flowing along the cooling channel 30c, and then carry the heat out of the battery cell to achieve cooling and temperature reduction.

[0062] In one embodiment, please refer to Figure 2 When there are multiple cooling channels 30c, the multiple cooling channels 30c can be spaced apart along the first direction of the receiving cavity 10a.

[0063] Please continue reading. Figure 1 and Figure 2 The battery cell includes a terminal post 40 disposed on the housing 10, and the number of terminal posts 40 is at least two, each terminal post 40 being electrically connected to the electrode assembly 20.

[0064] The position of each pole post 40 on the housing 10 is not limited. For example, please refer to [link to example]. Figure 1 Each pole post 40 can be disposed on the same side of the outer casing 10 along the first direction.

[0065] For example, please refer to Figure 5 and Figure 6 Each pole post 40 can also be respectively disposed on opposite sides of the outer casing 10 along the second direction perpendicular to the first direction. That is, some pole posts 40 are disposed on one side of the outer casing 10 along the second direction, and other pole posts 40 are disposed on the other side of the outer casing 10 along the second direction.

[0066] Each pole post 40 can be set on the cover plate 12, or on the housing 11, or some pole posts 40 can be set on the cover plate 12 and others on the housing 11.

[0067] Since each cooling channel 30c has a channel inlet 30c1 and a channel outlet 30c2, the multiple cooling channels 30c are spaced apart along the first direction of the receiving cavity 10a of the cooling component 30. This allows the cooling medium to flow into each cooling channel 30c in a dispersed manner. As a result, not only can the cooling medium be distributed more evenly within the cooling component 30, but the distance that the cooling medium flowing along each cooling channel 30c travels within the cooling component 30 can also be minimized. This effectively prevents the cooling medium from absorbing too much heat due to an excessively long flow distance, thus affecting the cooling effect.

[0068] In addition, the battery pack can also adjust the flow rate of the cooling medium flowing into the cooling element 30 by monitoring the temperature of the cooling medium flowing out of the cooling element 30. For example, when the temperature of the cooling medium flowing out of the cooling element 30 is relatively high, the flow rate of the cooling medium flowing into the cooling element 30 can be increased, so that the cooling medium can carry away the absorbed heat from the battery cells more quickly. As a result, the temperature inside the battery cells can be kept within a controllable range, which is more conducive to effectively improving the cooling effect of the battery cells.

[0069] In one embodiment, please refer to Figures 2 to 4 Each cooling channel 30c can extend between opposite sides of the receiving cavity 10a along the second direction. That is, the channel inlet 30c1 of each cooling channel 30c faces one side of the receiving cavity 10a along the second direction, and the channel outlet 30c2 of each cooling channel 30c faces the opposite side of the receiving cavity 10a along the second direction. The electrode assembly 20 can be disposed on at least one side of the cooling member 30 along the third direction of the receiving cavity 10a, wherein the first direction, the second direction, and the third direction are perpendicular to each other. For example, Figure 4 The battery cell shown has electrode assemblies 20 disposed on opposite sides of the cooling element 30 along a third direction. The number of electrode assemblies 20 on each side can be one or more. In other embodiments, electrode assemblies 20 may be disposed on only one side of the cooling element 30 along a third direction. Alternatively, at least a portion of the cooling element 30 may be disposed inside the electrode assembly 20.

[0070] Please see Figure 4 Since at least a portion of the electrode assembly 20 and the cooling element 30 are located within the receiving cavity 10a of the cooling element 30, in order to minimize the space occupied by the cooling element 30 within the receiving cavity 10a, the thickness dimension D of the portion of the cooling element 30 located within the receiving cavity 10a along the third direction can be adjusted appropriately. More preferably, the thickness dimension D of the portion of the cooling element 30 located within the receiving cavity 10a along the third direction can be 1mm to 5mm (including the endpoint value). For example, the thickness dimension D of the portion of the cooling element 30 located within the receiving cavity 10a along the third direction can be 1mm, 3mm, 5mm, etc.

[0071] Additionally, for ease of description, the projected area of ​​the portion of the cooling element 30 located within the receiving cavity 10a on a projection plane perpendicular to the third direction can be referred to as the first area, and the projected area of ​​the electrode assembly 20 on a projection plane perpendicular to the third direction can be referred to as the second area. For example, Figure 2 The cooling element 30 shown is equivalent to the projection of the cooling element 30 onto a projection plane perpendicular to the third direction. Figure 2 The cooling components 30 shown are all located within the receiving cavity 10a, therefore, Figure 2 The area of ​​the cooling element 30 shown in this view is the first area, and the electrode assembly 20 is in Figure 2 The area from the perspective of the first area is the second area. More preferably, the first area can be 95% to 100% of the second area (including the endpoint value). For example, the first area can be 95%, 98%, 100% of the second area, etc. That is to say, the first area of ​​the cooling element 30 can be close to or equal to the second area of ​​the electrode assembly 20, so that the cooling effect of the cooling element 30 can be better improved by maximizing the portion of the cooling element 30 located in the receiving cavity 10a.

[0072] In one embodiment, please refer to Figure 2 and Figure 3 The cooling component 30 may have a medium inlet 30a and an inlet channel 30d. The inlet channel 30d is connected to the medium inlet 30a and the inlet 30c1 of each cooling channel 30c. The medium inlet 30a is the inlet for the cooling medium to enter the interior of the cooling component 30 from the outside. That is, the cooling medium flows from the medium inlet 30a into the inlet channel 30d, and then from the inlet channel 30d into each cooling channel 30c.

[0073] The number of media input ports 30a can be one or more.

[0074] Setting up a medium inlet 30a and an inlet channel 30d facilitates the connection between the channel inlet 30c1 of each cooling channel 30c and the cooling pipeline.

[0075] Please see Figure 2 and Figure 3 The cooling component 30 may also have a medium outlet 30b and an outlet channel 30e, the outlet channel 30e being connected to the medium outlet 30b and the outlet 30c2 of each cooling channel 30c. The medium outlet 30b is the outlet from which the cooling medium flows from the inside of the cooling component 30 to the outside of the cooling component 30. That is, the cooling medium flowing out from the outlet 30c2 of each cooling channel 30c first enters the outlet channel 30e, and then flows from the outlet channel 30e to the medium outlet 30b.

[0076] The number of media output ports 30b can be one or more.

[0077] Setting up a medium output port 30b and an output flow channel 30e also facilitates the connection between the flow channel outlet 30c2 of each cooling flow channel 30c and the cooling pipeline.

[0078] Figure 2 and Figure 3 The cooling component 30 shown has both a medium inlet 30a and an inlet channel 30d, as well as a medium outlet 30b and an outlet channel 30e. In some other embodiments, the cooling component 30 may only have a medium inlet 30a and an inlet channel 30d, without having a medium outlet 30b and an outlet channel 30e. For example, the inlet 30c1 of each cooling channel 30c may be directly connected to the external cooling pipe of the battery cell. Alternatively, a first interface may be provided on the housing 10, which is directly connected to the inlet 30c1 of each cooling channel 30c and the cooling pipe.

[0079] In other embodiments, only the medium output port 30b and the output channel 30e may be provided, without the medium input port 30a and the input channel 30d. For example, the channel outlet 30c2 of each cooling channel 30c may be directly connected to the external cooling pipe of the battery cell. Alternatively, a second interface may be provided on the housing 10, which may be directly connected to the channel outlet 30c2 of each cooling channel 30c and the cooling pipe.

[0080] For a cooling component 30 that has both a medium output port 30b and an output flow channel 30e, the number of medium input ports 30a and medium output ports 30b can be the same or different.

[0081] Please see Figure 2 and Figure 3 The medium inlet 30a and the medium outlet 30b can be located on the same side of the cooling element 30, for example, Figure 2 The medium inlet 30a and medium outlet 30b shown are located on the same side of the cooling element 30 along the first direction. In other embodiments, the medium inlet 30a and medium outlet 30b may also be located on the same side of the cooling element 30 along other directions.

[0082] Please see Figure 1 and Figure 2The outer casing 10 may be provided with a pressure relief port (not shown) communicating with the receiving cavity 10a. The pressure relief port is used to install the explosion-proof valve 50 of the battery cell. When the battery cell experiences thermal runaway, if the pressure inside the receiving cavity 10a reaches the opening pressure of the explosion-proof valve 50, the explosion-proof valve 50 can open, allowing the free electrolyte and / or high-pressure gas inside the receiving cavity 10a to be discharged from the pressure relief port, thereby reducing the pressure inside the receiving cavity 10a and preventing the battery cell from exploding due to excessive pressure.

[0083] For the medium inlet 30a and medium outlet 30b located on the same side of the cooling element 30, for ease of arrangement of the medium inlet 30a and medium outlet 30b, please refer to the example provided. Figure 2 The medium inlet 30a and the medium outlet 30b can be located on opposite sides of the explosion-proof valve 50, respectively.

[0084] In other embodiments, the medium inlet 30a and the medium outlet 30b may also be located on the side of the cooling element 30 away from the explosion-proof valve 50 along the first direction, or the medium inlet 30a and the medium outlet 30b may also be located on other sides of the cooling element 30.

[0085] Please see Figure 5 and Figure 6 The medium inlet 30a and the medium outlet 30b can also be located on opposite sides of the cooling element 30, that is, the medium inlet 30a and the medium outlet 30b are not on the same side of the cooling element 30.

[0086] The medium inlet 30a and the medium outlet 30b can be respectively located on opposite sides of the cooling element 30. For example, Figure 5 and Figure 6 The medium inlet 30a and medium outlet 30b shown are disposed on opposite sides of the cooling element 30 along a second direction perpendicular to the first direction. In other embodiments, the medium inlet 30a and medium outlet 30b may also be disposed on the cooling element 30 along other directions (including but not limited to opposite sides of the first direction).

[0087] In other embodiments, the medium inlet 30a and the medium outlet 30b may be respectively disposed on two adjacent sides of the cooling element 30, or the medium inlet 30a and the medium outlet 30b may be respectively disposed on two different sides of the cooling element 30 that are neither opposite nor adjacent.

[0088] Furthermore, when the battery cell is placed upright, the first direction is equivalent to the height direction of the battery cell. Therefore, when the medium inlet 30a is located on one side of the cooling element 30 along the second direction, in order to ensure that the cooling medium can flow into each cooling channel 30c in a timely manner and improve the uniformity of the cooling medium flow inside the cooling element 30, it is preferable to provide multiple medium inlets 30a (the number of medium inlets 30a can be two or more). The multiple medium inlets 30a are spaced apart along the first direction, which is equivalent to the multiple medium inlets 30a being spaced apart along the height direction of the battery cell. For battery cells with terminals 40 on the same side, it is preferable to provide medium inlets 30a on opposite sides of the terminals 40 along the first direction.

[0089] Similarly, when the medium outlet 30b is located on one side of the cooling element 30 along the second direction, in order to ensure that the cooling medium can flow out from each cooling channel 30c in a timely manner and improve the uniformity of the cooling medium flow inside the cooling element 30, it is preferable that multiple medium outlets 30b (the number of medium outlets 30b can be two or more) can be provided. The multiple medium outlets 30b are spaced apart along the first direction, which is equivalent to the multiple medium outlets 30b being spaced apart along the height direction of the battery cell. For battery cells with electrode posts 40 on the same side, it is preferable that medium outlets 30b can be provided on opposite sides of the electrode post 40 along the first direction.

[0090] In one embodiment, please refer to Figure 1 and Figure 2 The outer casing 10 may include a first connector 13 having a first communication port 13a and a second connector 14 having a second communication port 14a. The cooling component 30 is disposed in the receiving cavity 10a. The medium inlet 30a is connected to the first communication port 13a, and the medium outlet 30b is connected to the second communication port 14a.

[0091] The first connector 13 and the second connector 14 are used to connect to the cooling pipes outside the battery cell. After the first connector 13 and the second connector 14 are connected to the cooling pipes, the cooling medium from the cooling pipes can enter the interior of the cooling component 30 through the first connecting port 13a and the medium inlet port 30a. The cooling medium flowing out of the interior of the cooling component 30 flows back to the cooling pipes through the medium outlet port 30b and the second connecting port 14a.

[0092] In one embodiment, please refer to Figure 5 and Figure 6The cooling component 30 may include a first protrusion 31, a second protrusion 32, and a main body 33. The first protrusion 31 has a medium inlet 30a, the second protrusion 32 has a medium outlet 30b, and the main body 33 has an inlet channel 30d, an outlet channel 30e, and multiple cooling channels 30c. The main body 33 is disposed within the receiving cavity 10a, and the first protrusion 31 and the second protrusion 32 are respectively disposed within the outer casing 10. The first protrusion 31 and the second protrusion 32 are used to connect to the cooling pipes outside the battery cell. That is, the outer casing 10 may not have the first connector 13 and the second connector 14, but can directly connect to the cooling pipes using the first protrusion 31 and the second protrusion 32 of the cooling component 30.

[0093] In one embodiment, please refer to Figure 2 , Figure 3 and Figure 5 Multiple cooling channels 30c are located on the same side of the input channel 30d. The medium inlet 30a can be located on the side opposite to the input channel 30d and the multiple cooling channels 30c. In other words, the medium inlet 30a and the multiple cooling channels 30c can be located on opposite sides of the input channel 30d.

[0094] For example, please refer to Figure 2 and Figure 3 The input channel 30d may include a first input section 30d1 and a second input section 30d2. Multiple cooling channels 30c are located on the same side of the first input section 30d1 along a first direction. The medium inlet 30a is located on the side of the first input section 30d1 opposite to the multiple cooling channels 30c along the first direction. The second input section 30d2 extends between the two opposite sides of the receiving cavity 10a along the first direction; that is, both ends of the second input section 30d2 face the opposite sides of the receiving cavity 10a along the first direction. The first input section 30d1 communicates with the medium inlet 30a and the second input section 30d2, respectively. The second input section 30d2 communicates with the channel inlet 30c1 of each cooling channel 30c. In other words, the cooling medium flowing in from the medium inlet 30a first enters the first input section 30d1 of the input channel 30d, then flows from the first input section 30d1 into the second input section 30d2 of the input channel 30d, and then flows from the second input section 30d2 into each cooling channel 30c.

[0095] For example, please refer to Figure 5 The input channel 30d can also extend only between the two opposite sides of the receiving cavity 10a along the first direction. That is, the two ends of the input channel 30d are respectively facing the two opposite sides of the receiving cavity 10a along the first direction, without the need to set the first input segment 30d1 and the second input segment 30d2.

[0096] In another embodiment, please refer to Figure 6Multiple cooling channels 30c are located on the same side of the input channel 30d. The medium inlet 30a can be located on the side of the input channel 30d adjacent to the multiple cooling channels 30c. That is, the medium inlet 30a and the multiple cooling channels 30c can be located on adjacent sides of the input channel 30d respectively.

[0097] For a battery cell where the medium inlet 30a and multiple cooling channels 30c are located on adjacent sides of the inlet channel 30d, please refer to the example provided. Figure 6 The input channel 30d may also extend only between the two opposite sides of the receiving cavity 10a along the first direction.

[0098] In one embodiment, please refer to Figure 2 , Figure 3 and Figure 5 Multiple cooling channels 30c are located on the same side of the output channel 30e. The medium output port 30b can be located on the side opposite to the output channel 30e and the multiple cooling channels 30c. In other words, the medium output port 30b and the multiple cooling channels 30c can be located on opposite sides of the output channel 30e.

[0099] For example, please refer to Figure 2 and Figure 3 The output channel 30e may include a first output section 30e1 and a second output section 30e2. Multiple cooling channels 30c are located on the same side of the first output section 30e1 along a first direction. A medium outlet 30b is located on the side of the first output section 30e1 opposite to the multiple cooling channels 30c along the first direction. The second output section 30e2 extends between the two opposite sides of the receiving cavity 10a along the first direction; that is, both ends of the second output section 30e2 face the opposite sides of the receiving cavity 10a along the first direction. The first output section 30e1 is connected to the medium outlet 30b and the second output section 30e2, respectively. The second output section 30e2 is connected to the channel inlet 30c1 of each cooling channel 30c. In other words, the cooling medium flowing out of each cooling channel 30c first enters the second output section 30e2 of the output channel 30e, then flows from the second output section 30e2 into the first output section 30e1 of the output channel 30e, and finally flows out from the medium outlet 30b.

[0100] For example, please refer to Figure 5 The output channel 30e can also extend only between the two opposite sides of the receiving cavity 10a along the first direction. That is, the two ends of the output channel 30e are respectively facing the two opposite sides of the receiving cavity 10a along the first direction, without the need to set the first output section 30e1 and the second output section 30e2.

[0101] In another embodiment, please refer to Figure 6Multiple cooling channels 30c are located on the same side of the output channel 30e. The medium output port 30b can be located on the side of the output channel 30e adjacent to the multiple cooling channels 30c. In other words, the medium output port 30b and the multiple cooling channels 30c can be located on adjacent sides of the output channel 30e respectively.

[0102] For battery cells where the medium output port 30b and multiple cooling channels 30c are located on adjacent sides of the output channel 30e, please refer to the example provided. Figure 6 The output channel 30e may also extend only between the two opposite sides of the receiving cavity 10a along the first direction.

[0103] In the description of this application, the references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in yet another embodiment," or "exemplary," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of the different embodiments or examples.

[0104] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A battery cell, characterized in that, include: A shell with a receiving cavity; Electrode assembly disposed within the receiving cavity; A cooling element, at least partially disposed within the receiving cavity; the cooling element having an input flow channel and a plurality of cooling flow channels located on the same side of the input flow channel.

2. The battery cell according to claim 1, characterized in that, The cooling channel has a channel inlet and a channel outlet.

3. The battery cell according to claim 1 or 2, characterized in that, The plurality of cooling channels are spaced apart along a first direction of the receiving cavity.

4. The battery cell according to claim 1 or 2, characterized in that, The cooling component has a medium inlet, and the inlet channels are respectively connected to the medium inlet and the channel inlets of each of the cooling channels; and / or, The cooling component has a medium outlet and an outlet channel, and the outlet channel is connected to the medium outlet and the outlet of each of the cooling channels.

5. The battery cell according to claim 4, characterized in that, The medium inlet and the plurality of cooling channels are respectively located on opposite sides of the inlet channel; or, The medium inlet and the plurality of cooling channels are respectively located on opposite sides of the inlet channel.

6. The battery cell according to claim 4, characterized in that, The input channel includes a first input section and a second input section. Multiple cooling channels are located on the same side of the first input section along a first direction. The medium inlet is located on the side of the first input section opposite to the multiple cooling channels along the first direction. The second input section extends between the two opposite sides of the receiving cavity along the first direction. The first input section communicates with both the medium inlet and the second input section, and the second input section communicates with the inlet of each cooling channel; or... The input channel extends between the two opposite sides of the receiving cavity along a first direction, and the plurality of cooling channels are located on the same side of the input channel. The medium inlet is located on the side of the input channel opposite to or adjacent to the plurality of cooling channels.

7. The battery cell according to claim 4, characterized in that, The plurality of cooling channels are located on the same side of the output channel, and the medium outlet is located on the side of the output channel opposite to or adjacent to the plurality of cooling channels.

8. The battery cell according to claim 4, characterized in that, The output channel includes a first output section and a second output section. A plurality of cooling channels are located on the same side of the first output section along a first direction. The medium output port is located on the side of the first output section opposite to the plurality of cooling channels along the first direction. The second output section extends between the two opposite sides of the receiving cavity along the first direction. The first output section communicates with both the medium output port and the second output section. The second output section communicates with the inlet of each cooling channel. The output channel extends between the two opposite sides of the receiving cavity along a first direction, and the plurality of cooling channels are located on the same side of the output channel. The medium outlet is located on the side of the output channel opposite to or adjacent to the plurality of cooling channels.

9. The battery cell according to claim 4, characterized in that, The housing includes a first connector with a first communication port and a second connector with a second communication port. The cooling component is disposed in the receiving cavity and has the medium inlet, the medium outlet and the outlet channel. The medium inlet communicates with the first communication port and the medium outlet communicates with the second communication port. or, The cooling component includes a first protrusion having the medium inlet, a second protrusion having the medium outlet, and a main body having the input channel, the output channel, and a plurality of cooling channels. The main body is disposed within the receiving cavity, and the first protrusion and the second protrusion are respectively disposed through the outer shell.

10. The battery cell according to claim 4, characterized in that, The cooling component has the medium inlet, the medium outlet, and the outlet flow channel; The medium inlet and the medium outlet are located on the same side of the cooling element; or, The medium inlet and the medium outlet are respectively located on opposite sides of the cooling component.

11. The battery cell according to claim 10, characterized in that, The outer casing has a pressure relief port communicating with the receiving cavity. The battery cell includes an explosion-proof valve disposed at the pressure relief port. The medium inlet and the medium outlet are disposed on the same side of the cooling component and are respectively located on opposite sides of the explosion-proof valve.

12. The battery cell according to claim 10, characterized in that, The cooling element has a plurality of media inlets on one side along a second direction perpendicular to the first direction, and the plurality of media inlets are spaced apart along the first direction; and / or, The cooling component has a plurality of medium outlets on one side along a second direction perpendicular to the first direction, and the plurality of medium outlets are spaced apart along the first direction.

13. The battery cell according to claim 3, characterized in that, Each of the cooling channels extends between opposite sides of the receiving cavity along the second direction; At least a portion of the cooling element is disposed inside the electrode assembly; or, The electrode assembly is disposed on at least one of the opposite sides of the cooling element along a third direction of the receiving cavity; The first direction, the second direction, and the third direction are perpendicular to each other.

14. The battery cell according to claim 13, characterized in that, The thickness of the portion of the cooling element located within the receiving cavity along the third direction is 1mm to 5mm; and / or, The portion of the cooling element located within the receiving cavity and the projected area of ​​the electrode assembly on a projection plane perpendicular to the third direction are respectively a first area and a second area, wherein the first area is 95% to 100% of the second area.

15. The battery cell according to claim 3, characterized in that, The battery cell includes at least two terminals disposed on the housing, and each terminal is electrically connected to the electrode assembly. Each of the aforementioned poles is disposed on the same side of the outer casing along the first direction; or, Each of the poles is respectively disposed on opposite sides of the outer casing along a second direction perpendicular to the first direction.

16. A battery pack, characterized in that, include: The battery cell according to any one of claims 1-15.

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