Battery cell, battery pack and electric equipment

Abstract

The utility model provides a battery cell, a battery pack and electric equipment, and relates to the technical field of batteries, the battery cell comprises a shell, a pole core and an electrolyte, the pole core and the electrolyte are arranged in the shell, and at least one side of the pole core is provided with a tab. One side of the shell is used for being arranged on a cooling plate, and the free part of the electrolyte is in contact with the tab and the shell. According to the battery cell provided by the embodiment of the invention, the free electrolyte absorbs heat and transfers heat, so that high temperature generated at the tab during fast charging can be reduced, and the thickness of the positive current collector and the negative current collector is prevented from being increased in the shell, so that the energy density of the battery cell is ensured, and the use performance of the battery cell is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and in particular, to an electrode core, a battery pack, and an electrical device using the same. Background Art

[0002] As a power source for providing power to transportation tools, power batteries are widely used in new energy vehicles.

[0003] Since the current flowing through the inner electrode core and the electrode tab of the power battery (electrode core) is extremely large during fast charging, according to Ohm's law, the heat generation power of the positive and negative electrode tabs of the electrode core will increase significantly. At the same time, since the heat capacity of the electrode tab part is small, the temperature of the electrode tab during fast charging is significantly higher than the average temperature of the electrode core, which in turn causes the heat generated by the electrode tab to be transferred to the electrode core in contact with it, exacerbating the uneven temperature distribution of the power battery and reducing the life and safety of the power battery. In related technologies, a thicker positive current collector or negative current collector is used to reduce the total resistance of the electrode tab part during fast charging, thereby reducing the heat generation power of the electrode tab during fast charging and further reducing its temperature during fast charging.

[0004] However, although the method of increasing the thickness of the positive and negative current collectors can reduce the heat generation power of the electrode tab, it will significantly reduce the energy density of the electrode core part. Summary of the Utility Model

[0005] Based on this, this application provides an electrode core, a battery pack, and an electrical device using the same to solve the problem that the temperature of the electrode tab and the electrode core of the existing power battery is too high during fast charging.

[0006] In a first aspect, this application provides an electrode core, including a housing, an electrode core, and an electrolyte;

[0007] The electrode core and the electrolyte are arranged inside the housing, and at least one side of the electrode core is provided with an electrode tab;

[0008] One side of the housing is used to be arranged on the cooling plate, and the free part of the electrolyte contacts the electrode tab and the housing.

[0009] In a possible implementation manner, the contact area between the free part of the electrolyte and the electrode tab is greater than or equal to 10% of the area of the electrode tab.

[0010] In a possible implementation manner, there is a preset distance between the free part of the electrolyte and the inner top of the housing, and the preset distance is less than or equal to 70% of the total internal height of the housing.

[0011] In a possible implementation manner, the preset distance is less than or equal to 60% of the total internal height of the housing.

[0012] In a possible implementation manner, an exhaust channel is arranged on one side inside the housing, and the exhaust channel corresponds to the preset distance.

[0013] In a possible implementation, an explosion-proof valve is further included, and the explosion-proof valve is disposed on the housing corresponding to the preset distance.

[0014] In a possible implementation, at least one tab is respectively disposed on two opposite sides of the electrode core.

[0015] In a possible implementation, the tab is located inside the housing, and the tab has opposite first and second sides;

[0016] A first distance exists between the first side and the inner top or inner bottom of the adjacent inner housing, and a second distance exists between the second side and the inner top or inner bottom of the adjacent inner housing, and the first distance is greater than or equal to the second distance.

[0017] In a possible implementation, the housing has a first side plate, the outer side surface of the first side plate is used to be disposed on the cooling plate, and at least the free part of the electrolyte contacts the inner side surface of the first side plate.

[0018] In a possible implementation, at least two tabs are disposed on one side of the electrode core, and the two tabs and the free part of the electrolyte are on the same side of the electrode core.

[0019] In a possible implementation, the explosion-proof valve is located on the side away from the tab.

[0020] In a second aspect, the present application further provides a battery pack, including a cooling plate and at least one battery cell provided in any one of the first aspects, and one side of the housing of the battery cell is disposed on the cooling plate.

[0021] In a third aspect, the present application further provides an electrical device, including a device body, and the battery cell provided in the first aspect is disposed on the device body;

[0022] Alternatively, the battery pack provided in the second aspect is disposed on the device body.

[0023] The present application provides a battery cell, a battery pack and an electrical device. The battery cell includes a housing, an electrode core and an electrolyte. By disposing the electrode core and the electrolyte in the housing and disposing tabs on at least one side of the electrode core. By disposing the housing on the cooling plate and making the free part of the electrolyte contact the tab and the housing, the free electrolyte with a large heat capacity absorbs and transfers the high temperature generated at the tab, and transfers the heat away by contacting the housing disposed on the cooling plate. Thus, the battery cell provided by the present application can reduce the high temperature generated at the electrode core and the tab during fast charging, absorb and transfer heat through the free electrolyte, and avoid increasing the thickness of the positive and negative current collectors in the housing, thereby ensuring the energy density of the battery cell and improving the service performance of the battery cell. Description of the Drawings

[0024] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0025] Figure 1 Schematic diagram of the installation structure of the battery cell and the cooling plate provided by the embodiment of the present application;

[0026] Figure 2 For Figure 1 Cross-sectional view along the A-A section in

[0027] Figure 3 For Figure 2 Schematic diagram of the dimensional correspondence relationship between the housing, the electrode core and the electrode tab in

[0028] Reference numerals:

[0029] 10: Cooling plate;

[0030] 100: Housing;

[0031] 101: First side plate;

[0032] 110: Exhaust passage;

[0033] 200: Electrode core;

[0034] 210: Electrode tab;

[0035] 211: First side;

[0036] 212: Second side;

[0037] 300: Free part;

[0038] 400: Explosion-proof valve. Detailed implementation manners

[0039] Here, the exemplary embodiments will be described in detail, and the examples are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all the implementation manners consistent with the present application. On the contrary, they are only examples of the methods and devices consistent with some aspects of the present application as detailed in the appended claims.

[0040] As used in the description, claims and the above drawings of this application, the terms "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application described herein, for example, can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0041] As described in the background art section, in the related art, a thicker positive electrode current collector or negative electrode current collector is used, and then by reducing the total resistance of the tab portion, the heat generation power of the tab during fast charging is reduced, and then its temperature during fast charging is reduced. However, although the method of increasing the thickness of the positive and negative electrode current collectors can reduce the heat generation power of the tab, it will significantly reduce the energy density of the electrode core part.

[0042] In addition, there is also a method of using roll welding for the negative electrode tab, that is, by welding more metal sheets only at the tab portion (i.e., negative electrode roll welding), to reduce the resistance of the negative electrode tab, and then reduce the heat generation power of the negative electrode tab without reducing the energy density of the electrode core. However, the negative electrode roll welding method has high requirements for the manufacturing process, and since the positive electrode tab is generally an aluminum part with relatively high rigidity, it will be difficult to bend when welded too thick to achieve welding with the lead-out sheet, so it is not suitable for reducing the heat generation power of the positive electrode tab.

[0043] In view of the above problems existing in the prior art, this application provides a battery cell, a battery pack and an electrical device using the same. The battery cell provided by this application includes a housing, an electrode core and an electrolyte. The electrode core and the electrolyte are arranged in the housing, and tabs are arranged on at least one side of the electrode core. By arranging the housing on a cooling plate, and the free part of the electrolyte contacts the tabs and the housing, the free electrolyte with a large heat capacity absorbs and transfers the high temperature generated at the tabs, and transfers this heat away by contacting the housing arranged on the cooling plate. Therefore, it is possible to reduce the high temperature generated at the electrode core and the tabs during fast charging, absorb and transfer heat through the free electrolyte, and avoid increasing the thickness of the positive and negative electrode current collectors in the housing, thereby ensuring the energy density of the battery cell and improving the performance of the battery cell.

[0044] The technical solutions of this application will be described in detail below with specific embodiments. These specific embodiments below can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0045] In the first aspect, referring toFigures 1 - 3 As shown, an embodiment of the present application provides an electric core, such as a blade battery or a sheet-shaped battery cell, which includes a housing 100, an electrode core 200, and an electrolyte.

[0046] The electrode core 200 and the electrolyte are disposed within the housing 100, and at least one side of the electrode core 200 is provided with an electrode tab 210.

[0047] One side of the housing 100 is used for being disposed on a cooling plate 10, and the free portion 300 of the electrolyte contacts the electrode tab 210 and the housing 100.

[0048] In this embodiment, the housing 100 is generally in a sheet-shaped or plate-shaped structure of a cuboid, the housing 100 has a length, a thickness, and a height, and the height is between the length and the thickness.

[0049] The electrode core 200 and the electrolyte are disposed within the housing 100. One side or both sides of the electrode core 200 are provided with electrode tabs 210, including a positive electrode tab and a negative electrode tab, so as to lead out of the housing 100 through a terminal post. The electrode tabs 210 are located on one side or both sides in the length direction of the housing 100.

[0050] The cooling plate 10 is used to provide an installation and cooling basis for the electric core, and it can be in a plate-shaped structure such as a rectangle or a square. Multiple electric cores can be arranged side by side in the thickness direction of the housing 100, and the lower surface of the housing 100 abuts against the upper surface of the cooling plate 10. The housing 100 can be connected to the cooling plate 10 by means of screwing, welding, cementing, etc.

[0051] Generally, the sheet-shaped battery cell is placed upright, the thickness of the battery cell is as shown in the Figure 1 X direction, the length of the battery cell is as shown in the Figure 1 Y direction, and the height of the battery cell is as shown in the Figure 1 Z direction.

[0052] Part of the electrolyte is absorbed by the electrode core 200, and the unabsorbed electrolyte becomes free electrolyte. The free electrolyte can also be referred to as the free portion 300 of the electrolyte. It is in the voids within the housing 100, especially in the void portions near the two electrode tabs 210, and at least contacts part of the electrode tabs 210 or completely covers the electrode tabs 210, so that the heat generated by the electrode tabs 210 can be absorbed and transferred through the free electrolyte.

[0053] It should be noted that the free electrolyte should not be too little or too full, because too little will reduce the heat absorption and heat transfer effect on the electrode tabs 210, and the over-full free electrolyte will decompose during use to generate too much gas. The specific dosage of the free portion 300 can be comprehensively selected according to the tolerance temperature of the electrolyte, the temperature control requirements of the electrode tabs 210 and the electrode core 200, and the gap size between the electrode tabs 210 and the inner bottom surface of the housing 100, etc.

[0054] For example, the higher the temperature tolerance of the electrolyte, the higher the proportion of free electrolyte can be. The higher the temperature control requirements for the tab 210 and the electrode core 200, the higher the proportion of the height of the free electrolyte can be. The smaller the gap between the tab 210 and the inner bottom surface of the housing 100, the smaller the proportion of the height of the free electrolyte can be. The proportion of the height of the free electrolyte mentioned here refers to the percentage of the height of the free electrolyte in the total height inside the housing 100 when the battery cell is in a horizontal state.

[0055] It can be understood that, compared with the case of no free electrolyte, when the battery cell in this embodiment is applied and the battery cell is fast-charged, a large amount of heat generated at the tab 210 can be absorbed and transferred by the free electrolyte with a large heat capacity for heat dissipation, so as to avoid uneven temperature distribution at the tab 210 and the electrode core 200 and reduce the life and safety of the battery cell. Therefore, it is possible to reduce the high temperature generated at the electrode core 200 and the tab 210 during fast charging. Since there is no need to increase the thickness of the positive and negative current collectors, the energy density of the battery cell is ensured and the performance of the battery cell is improved.

[0056] Thus, the battery cell provided in the embodiment of the present application includes a housing 100, an electrode core 200, and an electrolyte. The electrode core 200 and the electrolyte are disposed inside the housing 100, and tabs 210 are disposed on at least one side of the electrode core 200. By disposing the housing 100 on the cooling plate 10 and making the free part 300 of the electrolyte contact the tabs 210 and the housing 100, the high temperature generated at the tabs 210 is absorbed and transferred by the free electrolyte with a large heat capacity, and the heat is transferred away by contacting the housing 100 disposed on the cooling plate 10. Therefore, it is possible to reduce the high temperature generated at the electrode core 200 and the tab 210 during fast charging. By absorbing and transferring heat through the free electrolyte, it is avoided to increase the thickness of the positive and negative current collectors inside the housing 100, thereby ensuring the energy density of the battery cell and improving the performance of the battery cell.

[0057] In a possible design, the contact area between the free part 300 of the electrolyte and the tab 210 is greater than or equal to 10% of the area of the tab 210.

[0058] With such a setting, it is avoided that the contact area between the free electrolyte and the tab 210 is too small to play a role in heat absorption and heat transfer. The specific proportion of the contact area between the free electrolyte and the tab 210 can be determined according to actual needs and is not limited too much in this embodiment. Generally, the contact area with the tab can be the projected area of the tab on the plane perpendicular to the thickness direction of the tab and in contact with the free electrolyte.

[0059] In a possible design, there is a preset distance L between the free part 300 of the electrolyte and the inner top of the housing 100, and the preset distance L is less than or equal to 70% of the total height H inside the housing 100.

[0060] As shown Figure 2 That is, the height of the free electrolyte accounts for more than 30% of the total height H inside the housing 100. By defining the distance range between the free part 300 of the electrolyte and the inner top of the housing 100, a certain space inside the battery cell is ensured for gas exhaust, avoiding or reducing the possibility of the battery cell undergoing thermal runaway, so as to improve the safety of the battery cell.

[0061] It should be noted that the total height H inside the housing 100 and the height of the free electrolyte can be measured by an instrument. For example, a part of the top of the housing 100 is removed, and then the total height H inside the housing 100 and the height of the free electrolyte are measured. In addition, after the battery cell has undergone charge and discharge cycles before leaving the factory, the proportion of the free electrolyte can be made to meet the design requirements by re-injecting the electrolyte, avoiding insufficient infiltration of the electrolyte.

[0062] In addition, in order to obtain the contact area ratio between the free electrolyte and the tab 210, first, the amount of free electrolyte inside the battery cell needs to be measured, secondly, the corresponding height of the free electrolyte is calculated, and finally, the contact area ratio is converted based on the height of the free electrolyte soaking the tab 210. The specific steps are as follows:

[0063] S1. Open two small holes on the two end surfaces (one corner of the battery cell) of the battery cell after it is completely discharged. Tilt the battery cell so that the free electrolyte can completely flow out of the battery cell by gravity through one of the small holes, and measure the volume of the obtained free electrolyte as V1.

[0064] S2. Place the battery cell in the form of being placed in a package. Based on the inner bottom surface of the battery cell, use a dimension measuring tool such as a ruler to measure the length B jr and width W jr of the electrode core 200, as Figure 3 shown.

[0065] S3. Use a dimension measuring tool such as a ruler to measure the length B and width W of the inner space of the battery cell.

[0066] S4. Divide the height direction of the inner space of the battery cell into n equal parts. Taking the height h i from the inner bottom surface of the battery cell to the i-th part as an example, cut off the structural parts between the inner bottom surface of the battery cell and the i-th part height except the electrode core 200 inside the battery cell, and measure its volume by the drainage method, denoted as V i .

[0067] S5. Thus, the free volume V i of the free electrolyte that can be filled corresponding to different heights h djyi inside the battery cell can be obtained, V jr =(B×W - B jr )×h i - V i, compare each V one by one djyi and the sum of them with V1 until, at the i-th equal part, the sum of each V djyi is greater than or equal to V1. At this time, determine that the i-th equal part is the actual height of the free electrolyte in the internal space of the battery cell, and then the distance h from the free electrolyte to the inner bottom surface of the battery cell can be obtained.

[0068] S6. Use a dimensional measurement tool such as a ruler to measure the distance between the bottommost surface of the tab 210 and the inner bottom surface of the battery cell, denoted as h0.

[0069] S7. Measure the total height D of the tab 210 in the height direction.

[0070] S8. From this, the contact area ratio between the free electrolyte and the tab 210 can be calculated as (h - h0) / D. In addition, an ultrasonic liquid level sensor can also be used to measure the liquid level height h of the free electrolyte in the battery cell. Among them, the more equal parts the internal space height direction of the battery cell is divided into, the more accurate the measured value of the height h is, and it can be determined according to actual needs. In addition, for a cylindrical battery cell, the measurement and calculation methods are similar.

[0071] Furthermore, in this embodiment, the preset spacing L is less than or equal to 60% of the total internal height H of the housing 100. That is, the height of the free electrolyte accounts for more than 40% of the total internal height H of the housing 100. The height ratio of the free electrolyte within this range has a better cooling effect on the electrode core 200 and the tab 210. For a more specific ratio, it can be determined according to actual needs, and no specific limitation is made in this embodiment.

[0072] Still further, in this embodiment, an exhaust passage 110 is provided on one side inside the housing 100, and the exhaust passage 110 corresponds to the preset spacing L. Among them, the exhaust passage 110 corresponding to the preset spacing L means that the exhaust passage 110 is a cavity inside the housing 100. That is, due to the influence of gravity, the free part 300 of the electrolyte will deposit at the bottom of the internal cavity of the housing 100. Furthermore, by controlling the amount of the free part 300 of the electrolyte, it is ensured that there is a cavity between the top liquid surface of the free part 300 of the electrolyte and the inner surface of the top housing 100 facing the electrode core 200. This cavity is the exhaust passage 110, and the length of this cavity along Figure 2 the Z direction in the middle is the preset spacing L.

[0073] With such a setting, as Figure 2 shown, the exhaust passage 110 can be provided on the upper side in the height direction inside the housing 100, as shown along Figure 2 the Z direction in the middle, and is located in the part of the preset spacing L to ensure normal exhaust during charging and discharging of the electrode core 200, and avoid or reduce the influence of the free electrolyte on the exhaust.

[0074] Furthermore, in this embodiment, an explosion-proof valve 400 is further included, and the explosion-proof valve 400 is disposed on the housing 100 corresponding to the preset distance L.

[0075] With such a setting, as Figure 2 shown, the explosion-proof valve 400 can be disposed on the upper part of one end face in the length direction of the housing 100, and at least a part of the explosion-proof valve 400 is correspondingly located in the part of the preset distance L, so as to avoid or reduce the influence of the free electrolyte on the explosion-proof valve 400. In addition, in other embodiments, the explosion-proof valve 400 being disposed on the housing 100 corresponding to the preset distance L can also be that the explosion-proof valve 400 is disposed on the part of the housing that is not in contact with the free electrolyte 300. Among them, for the specific type, size, installation position, etc. of the explosion-proof valve 400, it can be determined according to actual needs and is not specifically limited in this embodiment.

[0076] In some embodiments, at least one tab 210 is respectively disposed on opposite sides of the electrode core 200. As Figure 2 shown, it is convenient to lead out the electrode posts, etc. from opposite ends of the housing 100 respectively, that is, the electrode posts are disposed at both ends of the battery cell, meeting diverse requirements.

[0077] In some embodiments, the tab 210 is located inside the housing 100, and the tab 210 has opposite first side 211 and second side 212. A first distance is provided between the first side 211 and the inner top or inner bottom of the adjacent housing 100, and a second distance is provided between the second side 212 and the inner top or inner bottom of the adjacent housing 100, and the first distance is greater than or equal to the second distance.

[0078] Specifically, as Figure 2 shown, the side of the tab 210 facing away from the cooling plate 10 is the first side 211, and the side close to the cooling plate 10 is the second side 212. At this time, the second side 212 is closest to the cooling plate 10, so that less free electrolyte can contact the tab 210. Therefore, when the offset side of the tab 210 is downward and in contact with the cooling plate 10, the effect of reducing the high temperature at the tab 210 and the electrode core 200 is better. In other embodiments, the first distance can also be equal to the second distance. For the specific sizes of the first distance and the second distance, it can be determined according to actual needs and is not specifically limited in this embodiment.

[0079] In some embodiments of the present application, the housing 100 has a first side plate 101, the outer side surface of the first side plate 101 is used for being disposed on the cooling plate 10, and the free part 300 of the electrolyte contacts at least the inner side surface of the first side plate 101.

[0080] Among them, the housing 100 of the battery cell can be surrounded by multiple side plates, and one of the side plates is the first side plate 101, and the first side plate 101 is in contact with the cooling plate 10. Through the direct contact between the free part 300 of the electrolyte and the first side plate 101, heat can be exchanged between the heat and the cooling plate 10 through the first side plate 101, thereby improving the cooling effect of the cooling electrode core 200.

[0081] It should be noted that the first side plate 101 can refer to the side plate arranged along the length direction and the thickness direction of the housing 100. Moreover, the inner side surface of the first side plate 101 refers to the surface facing the electrode core 200, and the outer side surface of the first side plate 101 refers to the surface facing away from the electrode core 200. Of course, the housing 100 can also be in contact with the cooling plate 10 through a second side plate, a third side plate, a fourth side plate, etc.

[0082] In addition, in some embodiments of the present application, at least two electrode tabs 210 are provided on one side of the electrode core 200, and the two electrode tabs 210 and the free part 300 of the electrolyte are located on the same side of the electrode core 200.

[0083] In this embodiment, both the positive electrode tab and the negative electrode tab are located on the same side of the electrode core 200, and the free part 300 of the electrolyte is also located on the side where the positive electrode tab and the negative electrode tab are located. At this time, the battery cell can be in an inverted state, that is, the electrode post of the battery cell faces the bottom.

[0084] Furthermore, the explosion-proof valve 400 is located on the side away from the electrode tab 210. That is, when the battery cell is in an inverted state, the electrode tab 210 is at the lower end of the battery cell, and the explosion-proof valve 400 is at the upper end of the battery cell, thereby improving the exhaust effect of the explosion-proof valve 400.

[0085] In a second aspect, an embodiment of the present application further provides a battery pack, including at least one battery cell provided in any of the above embodiments.

[0086] Among them, the structure of the battery cell has been described in detail in the above embodiments, and will not be repeated here one by one.

[0087] The battery pack provided by the embodiment of the present application, by configuring the battery cell, including the housing 100, the electrode core 200 and the electrolyte, by arranging the electrode core 200 and the electrolyte in the housing 100, and arranging the electrode tab 210 on at least one side of the electrode core 200. By arranging the housing 100 on the cooling plate 10 and making the free part 300 of the electrolyte contact the electrode tab 210 and the housing 100, the free electrolyte with a large heat capacity absorbs and transfers the high temperature generated at the electrode tab 210, and transfers the heat away by contacting the housing 100 arranged on the cooling plate 10. Therefore, it is possible to reduce the high temperature generated at the electrode core 200 and the electrode tab 210 during fast charging, absorb and transfer heat through the free electrolyte, and avoid increasing the thickness of the positive and negative current collectors in the housing 100, thereby ensuring the energy density of the battery cell and improving the use performance of the battery cell.

[0088] Further, in this embodiment, a heat-conducting layer is provided between the housing 100 and the cooling plate 10.

[0089] In this way, the contact between the housing 100 and the cooling plate 10 is made closer, the heat-conducting effect is better, and the temperature can be reduced more quickly.

[0090] Wherein, the heat-conducting layer may include at least one of heat-conducting glue and structural glue, and the specific type may be determined according to actual requirements and is not specifically limited in this embodiment.

[0091] In addition, a coolant circulation channel may be provided in the cooling plate 10. In this way, the heat generated by the tab 210 and the electrode core 200 can be conducted to the cooling plate 10 through the free electrolyte and the housing 100, and then the heat is carried away by the coolant to achieve temperature reduction.

[0092] Of course, the cooling plate 10 may also be replaced by other types of cooling components, structures, etc., which may be specifically determined according to actual requirements and are not specifically limited in this embodiment.

[0093] In a third aspect, an electrical device provided by an embodiment of the present application further includes a device body, and the device body is provided with the battery cell provided in any of the above embodiments.

[0094] Alternatively, the device body is provided with the battery pack provided in any of the above embodiments.

[0095] The electrical device provided by the embodiment of the present application, by configuring the above battery pack, the battery pack includes a battery cell, the battery cell includes a housing 100, an electrode core 200 and an electrolyte, by arranging the electrode core 200 and the electrolyte in the housing 100, and arranging a tab 210 on at least one side of the electrode core 200. By arranging the housing 100 on the cooling plate 10 and making the free part 300 of the electrolyte contact the tab 210 and the housing 100, the high temperature generated at the tab 210 is absorbed and transferred by the free electrolyte with a large heat capacity, and the heat is transferred away by contacting the housing 100 arranged on the cooling plate 10. Therefore, the high temperature generated at the electrode core 200 and the tab 210 during fast charging can be reduced, the heat is absorbed and transferred by the free electrolyte, and the thickness of the positive and negative current collectors in the housing 100 is not increased, thereby ensuring the energy density of the battery cell and improving the service performance of the battery cell.

[0096] Other embodiments of the present application will be readily apparent to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include known common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and examples are only to be considered as exemplary, and the true scope and spirit of the present application are pointed out by the claims.

[0097] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A battery cell, characterized in that: It comprises a shell (100), a pole core (200) and an electrolyte; The pole core (200) and the electrolyte are arranged in the housing (100), and a pole ear (210) is arranged on at least one side of the pole core (200); One side of the shell (100) is used to be arranged on a cooling plate (10), and the free portion (300) of the electrolyte is in contact with the electrode tab (210) and the shell (100).

2. The battery cell according to claim 1, characterized in that: The contact area between the free part (300) of the electrolyte and the electrode tab (210) is greater than or equal to 10% of the area of ​​the electrode tab (210).

3. The battery cell according to claim 1, characterized in that: There is a preset distance between the free part (300) of the electrolyte and the inner top of the shell (100), and the preset distance is less than or equal to 70% of the total height of the inside of the shell (100).

4. The battery cell according to claim 3, characterized in that: The preset distance is less than or equal to 60% of the total internal height of the housing (100).

5. The battery cell according to claim 3, characterized in that: An exhaust channel (110) is provided on one side of the interior of the housing (100), and the exhaust channel (110) corresponds to the preset distance.

6. The battery cell according to claim 3, characterized in that: It also includes an explosion-proof valve (400), wherein the explosion-proof valve (400) is arranged on the housing (100) corresponding to the preset distance.

7. The battery cell according to claim 1, characterized in that: At least one pole lug (210) is respectively disposed on two opposite sides of the pole core (200).

8. The battery cell according to any one of claims 1 to 7, characterized in that: The pole lug (210) is located in the housing (100), and the pole lug (210) has a first side (211) and a second side (212) that are opposite to each other; There is a first distance between the first side (211) and the adjacent inner top or inner bottom of the shell (100), and there is a second distance between the second side (212) and the adjacent inner top or inner bottom of the shell (100), and the first distance is greater than or equal to the second distance.

9. The battery cell according to any one of claims 1 to 7, characterized in that: The shell (100) has a first side plate (101), the outer side surface of the first side plate (101) is used to be arranged on the cooling plate (10), and the free part (300) of the electrolyte is in contact with at least the inner side surface of the first side plate (101).

10. The battery cell according to claim 6, characterized in that: At least two pole ears (210) are arranged on one side of the pole core (200), and the two pole ears (210) and the free part (300) of the electrolyte are located on the same side of the pole core (200).

11. The battery cell according to claim 10, characterized in that: The explosion-proof valve (400) is located on a side away from the electrode lug (210).

12. A battery pack, characterized in that: It comprises a cooling plate (10) and at least one battery cell according to any one of claims 1 to 11, wherein one side of the housing (100) of the battery cell is arranged on the cooling plate (10).

13. The battery pack according to claim 12, characterized in that: A heat-conducting layer is provided between the housing (100) and the cooling plate (10).

14. An electrical device, characterized in that: A device body is provided with a battery cell as claimed in any one of claims 1 to 11; Alternatively, a battery pack as described in claim 12 or 13 is arranged on the device body.

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