Battery monomer, power battery pack and electric device

Abstract

The application provides a battery monomer, a power battery pack and a power utilization equipment, and relates to the technical field of power batteries. The battery monomer comprises: a liquid cooling piece, which has a cooling cavity configured to accommodate cooling liquid; and a battery cell structure, which has an accommodating cavity, is connected with the liquid cooling piece, and is configured to accommodate at least part of the structure of the liquid cooling piece. The battery cell structure is provided with the accommodating cavity, at least part of the structure of the liquid cooling piece is arranged in the accommodating cavity, and the liquid cooling piece has the cooling cavity for the flow of the cooling liquid. Therefore, the battery cell structure is directly in contact with the liquid cooling piece for heat conduction, the heat conduction path is shortened, the heat conduction efficiency is increased, and the cooling rate of the battery cell structure during normal use and thermal runaway is improved.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and more specifically, to a battery cell, a power battery pack, and an electrical device. Background Technology

[0002] In the pursuit of energy conservation and emission reduction, batteries are widely used in electrical equipment such as computers, electric vehicles, and other devices, providing them with power. Given these applications, proper heat dissipation for batteries is essential. Current cooling methods often involve long heat conduction paths and high thermal resistance, hindering effective heat dissipation. Summary of the Invention

[0003] The purpose of this application is to provide a battery cell, a power battery pack, and an electrical device that facilitates heat dissipation of the battery cell.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] In a first aspect, this application provides a battery cell, comprising: a liquid cooler having a cooling cavity configured to contain coolant; and a cell structure having a receiving cavity connected to the liquid cooler, wherein the receiving cavity is configured to contain at least a portion of the liquid cooler.

[0006] In the above implementation process, the cell structure is provided with a receiving cavity, at least a part of the liquid cooling component is disposed in the receiving cavity, and the liquid cooling component has a cooling cavity for the flow of coolant, so that the cell structure directly contacts the liquid cooling component for heat conduction, shortening the heat conduction path, increasing the heat conduction efficiency, and improving the cooling rate of the cell structure during normal use and during thermal runaway.

[0007] In some embodiments, the liquid cooling component includes a liquid cooling body and a welding flange, wherein the outer edge of the liquid cooling body is provided with a welding flange, and the welding flange is welded to the battery cell structure.

[0008] In the above process, a welding flange is provided on the outer edge of the liquid cooling body, so that the liquid cooling body can be fixed to the housing cavity of the battery cell structure through the welding flange. This prevents the liquid cooling body from moving relative to the battery cell structure during use or transportation, which helps to ensure the overall cooling balance and improve the performance coefficient of the battery cell.

[0009] In some embodiments, the liquid cooling body is fixedly connected to the welding flange, and a groove is provided at the fixed position of the liquid cooling body.

[0010] In the above process, the fixed position of the liquid cooling body and the welding flange is provided with grooves to meet the pressure requirements of the coolant during normal circulation inside the liquid cooling body and the gas pressure requirements inside the cell structure during normal use. At the same time, when the cell structure experiences thermal runaway, the pressure inside the cell structure increases rapidly. After exceeding the burst pressure of the grooves, the fixed position of the liquid cooling body and the welding flange ruptures. The coolant in the liquid cooling body directly enters the inside of the cell structure to cool it down, thereby suppressing the thermal runaway and heat generation of the cell structure.

[0011] In some embodiments, the burst pressure of the groove is 0.4 to 0.6 MPa, which can meet the pressure requirements of the coolant during normal circulation inside the liquid-cooled body and the gas pressure requirements inside the cell structure during normal use. It can also rupture when the cell structure experiences thermal runaway, allowing the coolant to enter the cell structure for cooling and improving the safety performance of the battery cell.

[0012] In some embodiments, the welding flange is welded to the battery cell structure, and the welding strength between the welding flange and the battery cell structure is 0.7 to 1.1 MPa. When the battery cell structure experiences thermal runaway and the thermal runaway cannot be suppressed, as the internal pressure of the battery cell structure gradually increases, pressure can be released at a fixed position between the welding flange and the battery cell structure, thereby preventing a violent explosion when the battery cell structure experiences thermal runaway.

[0013] In some embodiments, the liquid cooling component further includes a sealing boss disposed at the end of the liquid cooling body, the sealing boss being configured to contract, and the contraction direction being the direction in which the sealing boss is away from the cell structure.

[0014] In the above process, a sealing boss is provided at the end of the liquid cooling body. The sealing boss is designed to be constricted, so that when the battery cell is installed in the power battery pack, it is beneficial to connect the liquid cooling components between the two battery cells connected in series, thereby achieving cooling of the cell structure.

[0015] In some embodiments, the cell structure includes a cell body, a cell housing, a positive terminal, and a negative terminal. The cell housing is configured to house the cell body. The cell body has a positive tab and a negative tab. The positive tab is configured to be connected to the positive terminal, and the negative tab is configured to be connected to the negative terminal.

[0016] In the above process, a battery cell body is set inside the battery cell housing. The positive terminal is connected to the positive tab of the battery cell body, and the negative terminal is connected to the negative tab of the battery cell body to form a charging or discharging of the battery cell body. At the same time, a liquid cooling component is set inside the battery cell body, which can directly cool down the battery cell body, shorten the heat conduction path, increase the heat conduction effect, and improve the performance of the battery cell body.

[0017] In some embodiments, the positive terminal has a second positive electrode insulator, which is L-shaped for insulating the positive terminal and the liquid cooling component.

[0018] In some embodiments, the negative terminal has a second negative electrode insulator, which is configured in an L-shape for insulation of the negative terminal and the liquid cooling component.

[0019] Secondly, this application also provides a power battery pack, comprising: a battery housing having a mounting cavity; and a battery cell as described in any of the preceding claims, wherein a plurality of the battery cells are configured and the plurality of the battery cells are configured in the mounting cavity.

[0020] In the above process, the battery housing is equipped with several battery cells, each of which has a liquid cooling component inside. This improves the thermal conductivity of the overall power battery pack structure, shortens the thermal path, and enhances the overall performance and safety of the power battery pack.

[0021] In some embodiments, the power battery pack further includes a connector sleeved on the end of the liquid cooling component of the battery cell, and the connector has a flow chamber for forming coolant flow between two battery cells connected in series.

[0022] In the above implementation process, a connector is provided between the two battery cells connected in series, which facilitates the sealed connection between the battery cells. At the same time, the connector is provided with a flow chamber, which facilitates the connection between battery cells and the power battery pack, and improves its heat conduction effect.

[0023] Thirdly, this application also provides an electrical device including a power battery pack as described in any of the above claims.

[0024] The electrical equipment provided in the third aspect of this application includes the power battery pack described in the second aspect of the technical solution, and therefore has all the technical effects of the above embodiments, which will not be repeated here.

[0025] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing embodiments of this application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For users of ordinary skills in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a battery cell disclosed in an embodiment of this application.

[0028] Figure 2 This is an exploded schematic diagram of a single battery cell disclosed in an embodiment of this application.

[0029] Figure 3 This is a schematic diagram of the liquid cooling component of a battery cell disclosed in an embodiment of this application.

[0030] Figure 4 This is a schematic diagram of the structure of the second positive electrode insulator / second negative electrode insulator of a battery cell disclosed in an embodiment of this application.

[0031] Figure 5 This is a schematic diagram of the structure of a power battery pack disclosed in an embodiment of this application.

[0032] Figure 6 This is a schematic diagram of the structure of a connector for a power battery pack disclosed in an embodiment of this application.

[0033] Figure Labels

[0034] 1. Battery cell; 2-a. Positive terminal; 2-b. Positive terminal post; 3. First positive electrode insulator; 4. Positive electrode top cover; 5. Second positive electrode insulator; 501. First recessed surface; 502. Second recessed surface; 6. Positive electrode connecting piece; 7-a. Positive electrode tab; 7-b. Cell body; 7-c. Negative electrode tab; 8. Liquid cooling component; 8-a. Groove markings; 8-b. Sealing boss; 8-c. Welded flange; 9. Negative electrode connecting piece; 10. Second negative electrode insulator; 101. Third recessed surface; 102. Fourth recessed surface; 11. Negative electrode top cover; 12. First negative electrode insulator; 13-a. Negative terminal; 13-b. Negative terminal post; 14. Casing body; 15. Connector. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by users of ordinary skill in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] Example

[0041] During the design process, the inventors discovered that existing basic power battery cooling solutions involve designing and arranging liquid cooling plates around the outer perimeter of the battery cell, such as the bottom, top, and sides. To ensure good contact and fixation between the liquid cooling plates and the outer wall of the battery cell, thermally conductive adhesive is typically also designed between the liquid cooling plates and the outer wall of the battery cell. Since the main heat-generating part of the battery cell during use is the bare cell containing sparks, the current basic power battery cooling solution generally uses a heat conduction path of bare cell - outer wall of the cell - thermally conductive adhesive - liquid cooling plate. The heat dissipation path is long, which carries away the heat generated during the use of the battery cell. In the current general cooling method, the heat conduction path from the bare battery cell to the outer wall of the battery cell, the thermal conductive adhesive, and the liquid cooling plate is relatively long and has a large thermal resistance, which affects the heat dissipation efficiency of the battery cell to a certain extent. In order to ensure good contact and fixation between the outer wall of the battery cell and the liquid cooling plate, the design of the thermal conductive adhesive has also increased the number of components and costs. At the same time, with the current external liquid cooling plate, the heat transfer path is long when the battery cell experiences thermal runaway, and the internal coolant of the liquid cooling system is not fully utilized to suppress the spread of thermal runaway.

[0042] In view of this, such as Figures 1-2 As shown, in a first aspect, this application provides a battery cell 1, which can be square or cylindrical. The battery cell 1 includes a liquid cooling component 8 and a cell structure. The liquid cooling component 8 is disposed inside the cell structure and welded to the cell structure, so that the liquid cooling component 8 can be fixed to the cell structure while also directly contacting the cell structure, thereby shortening the heat conduction path and increasing the heat conduction efficiency.

[0043] Specifically, the liquid cooling component 8 has a cooling cavity configured to contain coolant; the battery cell structure has a receiving cavity connected to the liquid cooling component 8, and the receiving cavity is configured to contain at least a portion of the liquid cooling component 8.

[0044] For example, the liquid cooling component 8 is configured to be distributed along the left-right direction, and the battery cell structure is configured to be distributed along the left-right direction. The battery cell structure is wound around the liquid cooling component 8 to form a cover for the liquid cooling component 8. At the same time, the battery cell structure is welded to the liquid cooling component 8. In this way, the battery cell structure and the liquid cooling component 8 are in direct contact. Compared with the traditional external liquid cooling pipe method, it reduces the number of components such as thermal conductive adhesive, reduces the number of parts, and lowers the cost. When the liquid cooling component 8 is fixedly connected to the inside of the battery cell structure to form the battery cell 1, it can also play a role in positioning and supporting the battery cell 1 when it is assembled into the power battery pack, simplifying the assembly process and enhancing the strength of the overall structure.

[0045] In the above implementation process, the cell structure is provided with a receiving cavity, at least a part of the liquid cooling component 8 is disposed in the receiving cavity, and the liquid cooling component 8 has a cooling cavity for the flow of coolant, so that the cell structure directly contacts the liquid cooling component 8 for heat conduction, shortening the heat conduction path, increasing the heat conduction efficiency, and improving the cooling rate of the cell structure during normal use and during thermal runaway.

[0046] like Figure 3 As shown, the liquid cooling component 8 includes a liquid cooling body and a welding flange 8-c. The outer edge of the liquid cooling body is provided with a welding flange 8-c, and the welding flange 8-c is welded to the battery cell structure.

[0047] For example, the liquid cooling body includes, but is not limited to, a liquid cooling pipe, which may be made of aluminum. The welding flange 8-c is arranged in a ring shape and welded to the left and right sides of the liquid cooling body. It should be noted that the inner ring of the welding flange 8-c is used for welding to the liquid cooling body, and the outer edge of the welding flange 8-c is used for welding to the battery cell structure, so as to fix the liquid cooling component 8 to the battery cell structure. Since the liquid cooling body is located inside the battery cell structure, the battery cell structure and the liquid cooling body can be transferred together, which to a certain extent avoids the risk of misalignment of the electrode plates, diaphragms, etc. of the battery cell structure.

[0048] In the above implementation process, a welding flange 8-c is provided on the outer edge of the liquid cooling body, so that the liquid cooling body can be fixed and sealed to the cavity of the cell structure through the welding flange 8-c (that is, the liquid cooling body can be fixed to the positive electrode top cover 4 and the negative electrode top cover 11 of the cell structure by welding the welding flange 8-c). This prevents the liquid cooling body from moving relative to the cell structure during the use or transportation of the battery cell 1, which helps to ensure the overall cooling balance and improve the performance coefficient of the battery cell 1.

[0049] During the design process, the inventors discovered that, since the cell structure inevitably carries the risk of thermal runaway during use, thermal runaway safety is particularly important in the design of battery cell 1; please refer to... Figure 3The liquid cooling body is fixedly connected to the welding flange 8-c (the fixing method can be welding or integral processing), and a groove 8-a is provided at the fixed position of the liquid cooling body. It can be understood that the groove 8-a at the fixed position of the liquid cooling body and the welding flange 8-c can meet the pressure requirements of the coolant during normal circulation inside the liquid cooling body and the gas pressure requirements inside the cell structure during normal use. At the same time, when the cell structure experiences thermal runaway, the pressure inside the cell structure increases rapidly, exceeding the burst pressure of the groove 8-a, causing the fixed position of the liquid cooling body and the welding flange 8-c to rupture. The coolant in the liquid cooling body directly enters the inside of the cell structure to cool it down, thereby suppressing thermal runaway and heat generation in the cell structure. In this way, the coolant directly contacts the area inside the cell structure where thermal runaway occurs, resulting in the shortest cooling time. At the same time, the coolant vaporizes and absorbs a large amount of heat, achieving optimal cooling and suppression of thermal runaway diffusion.

[0050] In some embodiments, the burst pressure of the groove 8-a is 0.4 to 0.6 MPa, which can meet the pressure requirements of the coolant during normal circulation inside the liquid-cooled body and the gas pressure requirements inside the cell structure during normal use. It can also rupture when the cell structure experiences thermal runaway, allowing the coolant to enter the cell structure for cooling and improving the safety performance of the battery cell 1.

[0051] In some embodiments, the welding flange 8-c is welded to the battery cell structure, and the welding strength between the welding flange 8-c and the battery cell structure is 0.7 to 1.1 MPa. When the battery cell structure experiences thermal runaway and the thermal runaway cannot be suppressed, as the internal pressure of the battery cell structure gradually increases, pressure relief can be achieved by ejecting pressure at a fixed position between the welding flange 8-c and the battery cell structure, thereby preventing a violent explosion when the battery cell structure experiences thermal runaway.

[0052] Please refer to again Figure 3The liquid cooling component 8 further includes a sealing boss 8-b, which is disposed at the end of the liquid cooling body. The sealing boss 8-b is configured to contract, and the contraction direction is the direction in which the sealing boss 8-b is away from the cell structure. For example, the sealing boss 8-b is disposed at both ends of the liquid cooling body. The sealing boss 8-b is welded to the liquid cooling body, or it can be integrally formed, or other connection methods can be used, as long as the sealing performance between the sealing boss 8-b and the liquid cooling body can be guaranteed. Simultaneously, the sealing boss 8-b is in communication with the liquid cooling body, allowing the coolant to flow through the sealing boss 8-b into the interior of the liquid cooling body, or from the interior of the liquid cooling body into the interior of the sealing boss 8-b, and then out of the sealing boss 8-b, thus forming the flow of coolant and completing the heat conduction of the cell structure.

[0053] In the above implementation process, a sealing boss 8-b is provided at the end of the liquid cooling body. The sealing boss 8-b is set in a contracted shape, so that when the battery cell 1 is installed in the power battery pack, it is beneficial to connect the liquid cooling component 8 between the two battery cells 1 connected in series, so as to achieve cooling of the cell structure.

[0054] Please refer to again Figure 2 The battery cell structure includes a battery cell body 7-b, a battery cell housing, a positive terminal, and a negative terminal. The battery cell housing is configured to accommodate the battery cell body 7-b. The battery cell body 7-b has a positive electrode tab and a negative electrode tab. The positive electrode tab (generally aluminum) is configured to be connected to the positive terminal, and the negative electrode tab (generally copper) is configured to be connected to the negative terminal. For example, the cell body 7-b generally includes a positive electrode plate, a negative electrode plate, a separator, and an electrolyte, etc. The cell body 7-b is distributed along the left-right direction and is wound around the liquid cooling body to form direct contact with the liquid cooling body. The cell housing includes a housing body 14, a positive electrode top cover 4, and a negative electrode top cover 11. The positive electrode top cover 4, the negative electrode top cover 11, and the housing body 14 can all be made of aluminum, or other metal materials. The positive electrode top cover 4 is located at the left end of the housing body 14, and the negative electrode top cover 11 is located at the right end of the housing body 14. The positive electrode top cover 4 is welded to the housing body 14, and the negative electrode top cover 11 is welded to the housing body 14 to form a housing cavity. The housing cavity is used to accommodate the cell body 7-b.

[0055] In the above process, a battery cell body 7-b is provided inside the battery cell housing. The positive terminal is connected to the positive tab of the battery cell body 7-b, and the negative terminal is connected to the negative tab of the battery cell body 7-b to form a charging or discharging of the battery cell body 7-b. At the same time, a liquid cooling component 8 is provided inside the battery cell body 7-b, which can directly cool the battery, shorten the heat conduction path, increase the heat conduction effect, and improve the performance of the battery cell body 7-b.

[0056] Please refer to Figure 2 and Figure 4 The positive terminal includes a positive terminal 2-a, a positive terminal post 2-b, a first positive electrode insulator 3, a second positive electrode insulator 5, and a positive electrode connecting piece 6. The first positive electrode insulator 3 is disposed on the outside of the cell housing. At least a portion of the structure of the positive terminal 2-a is exposed outside the cell housing, and this portion of the structure is located on the side of the first positive electrode insulator 3 away from the cell housing. The positive terminal post 2-b is disposed on the inside of the cell housing, and one side of the positive terminal post 2-b is welded to the positive terminal 2-a, while the other side of the positive terminal post 2-b is welded to the positive electrode connecting piece 6. The second positive electrode insulator 5 is disposed on the side of the positive terminal post 2-b away from the positive electrode connecting piece 6 and is in contact with the cell housing.

[0057] For example, the positive electrode connecting piece 6, the positive terminal 2-a, and the positive electrode post 2-b can all be made of aluminum, and the positive terminal 2-a and the positive electrode post 2-b can be fixed by friction welding or other methods. The first positive electrode insulating component 3 and the second positive electrode insulating component 5 both include, but are not limited to, insulating plastic. The first positive electrode insulating component 3 is disposed between the positive terminal 2-a and the positive electrode top cover 4 to form insulation between the positive terminal 2-a and the positive electrode top cover 4. The second positive electrode insulating component 5 is disposed between the positive electrode post 2-b and the positive electrode top cover 4 to form insulation between the positive electrode post 2-b and the positive electrode top cover 4. The insulation between the covers 4 and the insulation between the positive electrode connecting piece 6 and the positive electrode top cover 4; wherein the second positive electrode insulating member 5 is configured in an "L" shape, which can support the positive electrode connecting piece 6 and insulate the positive electrode connecting piece 6 and the liquid cooling body, and both the horizontal and vertical surfaces of the second positive electrode insulating member 5 are recessed to form a first recessed surface 501 and a second recessed surface 502. The positive electrode post 2-b is located at the first recessed surface 501. The positive electrode connecting piece 6 can also be configured in an "L" shape, and the positive electrode connecting piece 6 contacts the first recessed surface 501 and the second recessed surface 502 respectively, so as to improve the space utilization of the battery cell 1.

[0058] Please refer to Figure 2 and Figure 4The negative terminal includes a negative terminal 13-a, a negative terminal post 13-b, a first negative terminal insulator 12, a second negative terminal insulator 10, and a negative terminal connecting piece 9. The first negative terminal insulator 12 is disposed on the outside of the cell housing. At least a portion of the structure of the negative terminal 13-a is exposed outside the cell housing, and this portion of the structure is located on the side of the first negative terminal insulator 12 away from the cell housing. The negative terminal post 13-b is disposed on the inside of the cell housing, and one side of the negative terminal post 13-b is welded to the negative terminal 13-a, and the other side of the negative terminal post 13-b is welded to the negative terminal connecting piece 9. The second negative terminal insulator 10 is disposed on the side of the negative terminal post 13-b away from the negative terminal connecting piece 9 and is in contact with the cell housing.

[0059] For example, the negative terminal 13-a includes, but is not limited to, aluminum; the negative terminal post 13-b includes, but is not limited to, copper; the negative terminal connecting piece 9 includes, but is not limited to, copper; the negative terminal 13-a and the negative terminal post 13-b are fixed by friction welding or other methods; the first negative terminal insulating component 12 and the second negative terminal insulating component 10 both include, but are not limited to, insulating plastic; the first negative terminal insulating component 12 is disposed between the negative terminal 13-a and the negative terminal top cover 11 to form insulation between the negative terminal 13-a and the negative terminal top cover 11; the second negative terminal insulating component 10 is disposed between the negative terminal post 13-b and the negative terminal top cover 11 to form insulation between the negative terminal 13-a and the negative terminal top cover 11. The insulation between the negative electrode post 13-b and the negative electrode top cover 11, and the insulation between the negative electrode connecting piece 9 and the negative electrode top cover 11; wherein the second negative electrode insulating member 10 is configured in an "L" shape, which can support the negative electrode connecting piece 9 and insulate the negative electrode connecting piece 9 and the liquid cooling body, and both the horizontal and vertical surfaces of the second negative electrode insulating member 10 are recessed to form a third recessed surface 101 and a fourth recessed surface 102. The negative electrode post 13-b is located at the third recessed surface 101. The negative electrode connecting piece 9 can also be configured in an "L" shape, and the negative electrode connecting piece 9 contacts the third recessed surface 101 and the fourth recessed surface 102 respectively, so as to improve the space utilization of the battery cell 1.

[0060] like Figure 5As shown, this application also provides a power battery pack, including: a battery housing having a mounting cavity; and battery cells 1 as described in any of the above claims, wherein a plurality of battery cells 1 are configured, and the plurality of battery cells 1 are configured in the mounting cavity. For example, the battery cells 1 are arranged in rows, wherein a plurality of battery cells 1 are located in the first row, and a plurality of battery cells 1 are located in the second row. The battery cells 1 in the second row correspond one-to-one with the battery cells 1 in the first row, forming a plurality of columns of battery cells 1. Each column has at least two battery cells 1 connected in series, and the two battery cells 1 connected in series are sealed together to allow for the flow of coolant. It should be noted that the plurality of battery cells 1 can also be arranged in other ways, which can be set according to the actual situation of the power battery pack, and will not be elaborated here.

[0061] In the above process, a number of battery cells 1 are arranged in the mounting cavity of the battery casing. Each battery cell 1 has a liquid cooling component 8 inside, which can improve the thermal conductivity of the overall structure of the power battery pack, shorten the thermal conduction path, and improve the overall performance and safety factor of the power battery pack.

[0062] like Figure 5 As shown, the power battery pack also includes a connector 15, which is sleeved on the end of the liquid cooling component 8 of the battery cell 1. The connector 15 has a flow chamber for forming a coolant flow between two battery cells 1 connected in series. Exemplarily, the connector 15 includes, but is not limited to, a plastic part. The connector 15 is interference-fitted with the sealing boss 8-b of the liquid cooling component 8, and the outer edge of the connector 15 is outwardly flared to facilitate the positioning of the battery cell 1.

[0063] In the above implementation process, a connector 15 is provided between the two battery cells 1 connected in series, which can facilitate the sealed connection between the battery cells 1. At the same time, the connector 15 is provided with a flow chamber, which facilitates the connection between the battery cells 1 and the power battery pack, and improves its heat conduction effect.

[0064] Thirdly, this application also provides an electrical device, including a power battery pack as described in any of the preceding claims. Exemplarily, the electrical device may be, but is not limited to, a mobile phone, tablet, laptop, electric toy, power tool, electric vehicle, electric car, ship, spacecraft, etc. Among these, electric toys may include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0065] The electrical equipment provided in the third aspect of this application includes the power battery pack described in the second aspect of the technical solution, and therefore has all the technical effects of the above embodiments, which will not be repeated here.

[0066] The above description is merely a preferred embodiment of this application and is not intended to limit this 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 should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: A liquid-cooled component having a cooling chamber configured to contain coolant; A battery cell structure having a receiving cavity, the battery cell structure being connected to the liquid cooling component, and the receiving cavity being configured to receive at least a portion of the liquid cooling component; wherein the battery cell structure is wound around the liquid cooling component to form an enclosure of the liquid cooling component; The liquid cooling component includes a liquid cooling body and a welding flange. The outer edge of the liquid cooling body is provided with a welding flange, and the welding flange is welded to the battery cell structure. The liquid cooling body is fixedly connected to the welding flange, wherein the fixed connection is by welding or integral processing, and the fixed position of the liquid cooling body and the welding flange is provided with groove markings.

2. The battery cell according to claim 1, characterized in that, The burst pressure of the groove markings is 0.4~0.6 MPa.

3. The battery cell according to claim 1, characterized in that, The welding flange is welded to the battery cell structure, and the welding strength between the welding flange and the battery cell structure is 0.7~1.1 MPa.

4. The battery cell according to claim 1, characterized in that, The liquid cooling component also includes a sealing boss, which is disposed at the end of the liquid cooling body. The sealing boss is configured to be contracted, and the contraction direction is the direction in which the sealing boss is away from the cell structure.

5. The battery cell according to claim 1, characterized in that, The battery cell structure includes a battery cell body, a battery cell housing, a positive terminal, and a negative terminal. The battery cell housing is configured to house the battery cell body. The battery cell body has a positive tab and a negative tab. The positive tab is configured to be connected to the positive terminal, and the negative tab is configured to be connected to the negative terminal.

6. The battery cell according to claim 5, characterized in that, The positive terminal has a second positive electrode insulating member, which is L-shaped for insulating the positive terminal and the liquid cooling member.

7. The battery cell according to claim 5, characterized in that, The negative terminal has a second negative terminal insulator, which is L-shaped for insulating the negative terminal and the liquid cooling component.

8. A power battery pack, characterized in that, include: Battery casing with mounting cavity; and The battery cell as described in any one of claims 1-7, wherein a plurality of the battery cells are configured, and the plurality of the battery cells are configured in the mounting cavity.

9. The power battery pack according to claim 8, characterized in that, The power battery pack also includes a connector, which is sleeved on the end of the liquid cooling component of the battery cell, and the connector has a flow chamber for forming a coolant flow between two battery cells connected in series.

10. An electrical appliance, characterized in that, Including the power battery pack as described in any one of claims 8-9.

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