Battery cell assembly, battery cell module and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell assembly, a battery cell module and a battery, and the battery cell assembly comprises a battery cell which is provided with a first cavity; the end cover is provided with a second cavity, and the end cover is connected to the two opposite ends of the battery cell through the second cavity and the first cavity; a connector used for being communicated with the outside is arranged on the side wall of the second cavity, and the connector is communicated with the first cavity and the second cavity to form a first flow channel. According to the utility model, the end covers are arranged at the two ends of the battery cell, the first cavity and the second cavity are connected and then form the first flow channel together with the connectors, and a cooling medium enters through the connector at one end, sequentially passes through the second cavity, the first cavity and the second cavity and then flows out of the connector at the other end, so that the battery cell is cooled under the condition that an external liquid cooling plate is not connected; when the liquid-cooled battery is applied to the battery, a traditional liquid-cooled plate is omitted, the overall structure is simplified, the space utilization rate and energy density of the battery are improved, and the cost of a cooling system and the manufacturing cost of the battery are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery core assembly, a battery core module and a battery. Background Art

[0002] Currently, most electric vehicle batteries are lithium-ion batteries, whose performance is sensitive to temperature fluctuations. Vehicles have limited loading space, requiring a large number of battery cells, which are tightly packed and connected. This allows heat to easily conduct and spread. Thermal management of power batteries directly impacts their performance, lifespan, and safety.

[0003] In the existing technology, liquid cooling is the best way to achieve cooling effect on battery cells. Liquid cooling usually involves adding a liquid cooling plate (made by welding profiles or brazing sheet metal) to the bottom of the box, the side of the battery module, or the large surface of the battery cell to achieve the purpose of cooling the battery cell. However, whether adding a liquid cooling plate to the side of the battery cell or adding a liquid cooling plate to the large surface of the battery cell, the liquid cooling plate structure is introduced, which takes up a lot of space in the battery pack, making it difficult to further improve space utilization and energy density.

[0004] To this end, a battery cell assembly, a battery cell module and a battery are proposed to solve the above problems. Utility Model Content

[0005] The main purpose of the present invention is to provide a battery cell assembly, a battery cell module and a battery, aiming to solve the technical problem in the prior art that the battery liquid cooling system occupies a large space, resulting in difficulty in further improving the battery space utilization and energy density.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides a battery cell assembly, comprising:

[0007] A battery cell, wherein the battery cell is provided with a first cavity having two opposite openings;

[0008] An end cap, wherein the end cap is provided with a second cavity with an open end, and the end cap is connected to opposite ends of the battery cell through the second cavity and the first cavity;

[0009] The side wall of the second cavity is provided with a joint for communicating with the outside, and the joint is communicated with the first cavity and the second cavity to form a first flow channel, and the first flow channel is used for the circulation of cooling medium.

[0010] Furthermore, the battery cell assembly further includes a plurality of the battery cells, and adjacent battery cells are connected via a first cavity.

[0011] Furthermore, the battery cell assembly also includes a guide plate, which is provided with a third cavity with openings at two opposite ends. Adjacent battery cells are connected through the guide plate, and the third cavity is connected to the first cavity, the second cavity and the joint to form a second flow channel, which is used for the circulation of cooling medium.

[0012] Furthermore, the guide plate is a straight plate or a curved plate.

[0013] Furthermore, the battery cell is also provided with a plurality of the first cavities, and the plurality of the first cavities are arranged along the opening direction; the battery cell assembly also includes a plurality of end covers and connecting tubes corresponding to the first cavities, and the plurality of end covers are respectively connected to the opposite ends of the battery cell through the second cavity and the first cavity, and the plurality of end covers at the opposite ends of the battery cell are connected through connecting tubes and joints, and the joints, connecting tubes, second cavities and first cavities are connected to form a third flow channel, and the third flow channel is used for the circulation of cooling medium.

[0014] Furthermore, the connecting pipe is a single-way pipe and / or a multi-way pipe.

[0015] Furthermore, a diversion structure is provided in the first cavity, and the diversion structure is provided along the direction of the openings at both ends of the first cavity.

[0016] Furthermore, the interface of the diversion structure in the first cavity is a corrugated structure.

[0017] The second aspect of the present invention proposes a battery cell module, comprising: a battery cell assembly as described in any one of the above items, wherein adjacent battery cell assemblies are connected by joints and connecting tubes, and the joints, connecting tubes, second cavities and first cavities are connected to form a fourth flow channel, and the fourth flow channel is used for the circulation of cooling medium.

[0018] Furthermore, adjacent battery cells are connected in the same plane.

[0019] A third aspect of the present invention provides a battery, comprising the battery cell module and box as described in any one of the above items, wherein the box is provided with a through hole, and the connecting tube passes through the through hole and is connected to the joint.

[0020] Beneficial effect: Compared with the prior art, a battery cell assembly in an embodiment of the present application includes a battery cell, wherein the battery cell is provided with a first cavity with openings at opposite ends; an end cover, wherein the end cover is provided with a second cavity with an opening at one end, and the end cover is connected to the opposite ends of the battery cell through the second cavity and the first cavity; the side wall of the second cavity is provided with a connector for communicating with the outside, and the connector is connected with the first cavity and the second cavity to form a first flow channel, and the first flow channel is used for circulating a cooling medium. The battery cell provided by the present invention is provided with a first cavity with openings at both ends, and a second cavity is provided on the end cover. The side wall of the second cavity is provided with a joint for communicating with the outside. The second cavity is connected to the first cavity, and the end covers are arranged at both ends of the battery cell. When the two ends of the first cavity are respectively connected to the second cavity, a first flow channel is formed together with the joint. The first flow channel can be used for the circulation of a cooling medium, that is, the cooling medium enters through the joint at one end, passes through the second cavity, the first cavity and the second cavity in sequence, and then flows out from the joint at the other end, thereby realizing the cooling of the battery cell without connecting to an external liquid cooling plate. The entire battery cell assembly eliminates the use of a traditional liquid cooling plate, simplifies the overall structure, and when applied to a battery, improves the battery space utilization and energy density, reduces the cooling system cost and the battery manufacturing cost.

[0021] Compared with the prior art, the embodiment of the present application provides a battery cell module, including the above-mentioned battery cell assembly. It is understandable that the battery cell module can have all the technical features and beneficial effects of the above-mentioned battery cell assembly, which will not be repeated here.

[0022] Compared with the prior art, the battery provided in the embodiment of the present application includes the above-mentioned battery cell module. It is understood that the battery can have all the technical features and beneficial effects of the above-mentioned battery cell module, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of a battery cell assembly provided by an embodiment of the present utility model;

[0024] Figure 2 yes Figure 1 Schematic diagram of the explosion of the battery cell assembly;

[0025] Figure 3 This is a schematic diagram of a multi-cell battery assembly provided by one embodiment of the present invention;

[0026] Figure 4 yes Figure 3 Schematic diagram of the explosion of the battery cell assembly;

[0027] Figure 5 This is a schematic diagram of a battery cell assembly with a guide plate provided in one embodiment of the present utility model;

[0028] Figure 6 yes Figure 5 Schematic diagram of the explosion of the battery cell assembly;

[0029] Figure 7 This is a schematic diagram of a battery cell provided with multiple first cavities according to an embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of another battery cell provided with multiple first cavities according to an embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of a battery cell assembly provided by an embodiment of the present invention, in which a plurality of first cavities are arranged on the same battery cell;

[0032] Figure 10 This is a schematic diagram of a battery module provided by an embodiment of the present utility model;

[0033] Figure 11 This is another schematic diagram of a battery module provided by an embodiment of the present utility model;

[0034] Figure 12 This is another schematic diagram of a battery module provided by an embodiment of the present utility model;

[0035] Figure 13 This is another schematic diagram of a battery module provided by an embodiment of the present utility model;

[0036] Figure 14 This is another schematic diagram of a battery module provided by an embodiment of the present utility model;

[0037] Figure 15 This is a schematic diagram of a battery provided by an embodiment of the present utility model;

[0038] Figure 16 This is a schematic diagram of a battery explosion provided by an embodiment of the present utility model;

[0039] Figure 17 This is another battery explosion schematic diagram provided by the present invention in an embodiment.

[0040] in:

[0041] 1. Battery cell; 11. First cavity; 111. First flow channel; 112. Second flow channel; 113. Third flow channel; 114. Fourth flow channel; 12. Diversion structure;

[0042] 2. End cover; 21. Second cavity; 22. Connector;

[0043] 3. guide plate; 31. third cavity;

[0044] 4. Connecting pipe; 41. Single-way pipe; 42. Multi-way pipe;

[0045] 5. Box body; 51. Through hole.

[0046] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0049] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0050] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0051] See also Figures 1 to 17 An embodiment of the present invention provides a battery cell assembly, comprising: a battery cell 1, wherein the battery cell 1 is provided with a first cavity 11 with openings at opposite ends; an end cover 2, wherein the end cover 2 is provided with a second cavity 21 with an opening at one end, and the end cover 2 is connected to the opposite ends of the battery cell 1 through the second cavity 21 and the first cavity 11; a side wall of the second cavity 21 is provided with a connector 22 for communicating with the outside, and the connector 22 is in communication with the first cavity 11 and the second cavity 21 to form a first flow channel 111, and the first flow channel 111 is used for circulating a cooling medium.

[0052] In this embodiment, the battery cell 1 is used to store and release electrical energy to provide power for the device. The end cap 2 is used to cooperate with the battery cell 1, and plays the role of connecting to the battery cell 1 and closing the flow channel. The connector 22 is a connector for communicating with the outside. The first cavity 11 and the second cavity 21 are components of the first flow channel 111, wherein the first cavity 11 is mainly used to cool the battery cell 1. During the battery charging and discharging process, the battery cell 1 will generate heat. The cooling medium flows in the first cavity 11, so that the heat can be quickly dissipated to prevent the battery cell 1 from overheating and ensure the performance and safety of the battery; the second cavity 21 is used to connect the end cap 2 and the battery cell 1, and cooperate with the first cavity 11 to form a complete first flow channel 111. At the same time, the second cavity 21 also plays the role of closing the first cavity 11 at the end of the battery cell 1, protecting the entire first flow channel 111 from the influence of the external environment.

[0053] In the above embodiment, a first cavity 11 is provided on the battery cell 1, and a second cavity 21 is provided on the end cap 2. The second cavity 21 is connected to both ends of the first cavity 11 and cooperates with the connector 22 to form a first flow channel 111, providing a flow path for the cooling medium. The cooling medium, such as coolant, can flow in the first flow channel 111, effectively removing the heat generated by the battery cell 1 during operation, preventing the battery cell 1 from overheating, thereby improving the safety and stability of the battery and extending the battery life. Specifically, the cooling medium enters through the connector 22 at one end, passes through the second cavity 21, the first cavity 11, and the second cavity 21 in sequence, and then flows out of the connector 22 at the other end. This achieves cooling of the battery cell 1 without connecting to an external liquid cooling plate. The entire battery cell assembly eliminates the use of a traditional liquid cooling plate, simplifying the overall structure. When applied to a battery, it improves the battery space utilization and energy density, reduces the cooling system cost and the battery manufacturing cost, and effectively solves the technical problem in the prior art that the battery liquid cooling system occupies a large space, making it difficult to further improve the battery space utilization and energy density.

[0054] Furthermore, when the end cover 2 is connected to the battery cell 1, the first cavity 11 and the second cavity 21 can be welded or the first cavity 11 and the second cavity 21 can be respectively provided with mutually matching quick-plug structures for plugging, or any other connection method. The present application does not impose any specific restrictions on the connection method between the first cavity 11 and the second cavity 21, and can meet the actual design requirements and ensure that the cooling medium does not leak during use.

[0055] See also Figures 1 to 17 In one embodiment, the battery cell assembly further includes a plurality of the battery cells 1 , and adjacent battery cells 1 are connected via a first cavity 11 .

[0056] In this embodiment, the battery cell assembly includes multiple battery cells 1, which can increase the energy storage capacity of the entire battery cell assembly. For example, it is applied to an electric vehicle battery pack. By connecting multiple battery cells 1, the energy storage required for long-distance driving of the vehicle can be met. The connection of multiple battery cells 1 helps to store more electricity in a limited space, thereby improving the energy density of the entire battery cell assembly.

[0057] In the above embodiment, adjacent battery cells 1 are connected by the first cavity 11, which provides a channel for the cooling medium to flow between multiple battery cells 1. When the cooling medium flows in the flow channel, it can pass through each battery cell 1 in turn, taking away the heat generated by each battery cell 1, thereby achieving effective cooling of the entire battery cell assembly. Specifically, the cooling medium, such as coolant, enters through the connector 22 at one end, passes through the second cavity 21, the first cavity 11 and the second cavity 21 where multiple battery cells 1 are connected end to end, and then flows out from the connector 22 at the other end, thereby achieving cooling of multiple battery cells 1 without connecting an external liquid cooling plate. Since adjacent battery cells 1 are connected by the first cavity 11, the cooling medium can flow naturally between the battery cells 1, and cooling of multiple battery cells 1 can be achieved without a complex diversion device. This makes the cooling system simpler and more efficient, can effectively reduce the overall temperature of the battery cell assembly, extend the service life of the battery cell 1, improve the safety and reliability of the battery, and when applied to batteries, improves the battery space utilization and energy density.

[0058] It can be understood that the first cavity 11 between adjacent battery cells 1 can be welded or respectively provided with mutually matching quick-plug structures, or can be any other connection method. The present application does not impose specific restrictions on the connection method between the first cavity 11 and the first cavity 11, and can meet the actual design requirements and ensure that the cooling medium does not leak during use.

[0059] See also Figures 1 to 17In one embodiment, the battery cell assembly further includes a guide plate 3, the guide plate 3 is provided with a third cavity 31 with openings at opposite ends, and adjacent battery cells 1 are connected through the guide plate 3, and the third cavity 31 is connected with the first cavity 11, the second cavity 21 and the joint 22 to form a second flow channel 112, which is used for the circulation of cooling medium.

[0060] It should be noted that during the manufacturing process of the cell assembly, in order to avoid damaging the cell 1, the processing technology of connecting the cell 1 with the cell 1 through the first cavity 11 is relatively difficult, and it is not convenient to arrange the cell assembly according to the structure of the battery pack. To solve the above problems, the present application introduces the guide plate 3 during the design and manufacturing process.

[0061] In this embodiment, the guide plate 3 is used to connect adjacent battery cells 1. At the same time, since the outside of the guide plate 3 is in direct contact with the air, part of the heat in the cooling medium can be transferred out through the guide plate 3, further improving the cooling efficiency, reducing the temperature of the battery cell 1, and extending the service life of the battery cell 1. After the adjacent battery cells 1 are connected through the guide plate 3, the third cavity 31 of the guide plate 3 is connected with the first cavity 11 of the battery cell 1, the second cavity 21 of the end cover 2, and the joint 22, forming a second flow channel 112 for the circulation of the cooling medium. Exemplarily, the cooling medium enters through the joint 22 at one end, passes through the second cavity 21, the first cavity 11, the third cavity 31, the first cavity 11, and the second cavity 21 in sequence, and then flows out from the joint 22 at the other end, realizing the cooling of multiple battery cells 1 without connecting to an external liquid cooling plate.

[0062] Furthermore, the guide plate 3 is a straight plate or a curved plate. This application does not impose any specific restrictions on the external shape and structure of the guide plate 3. It only needs to meet the actual layout design requirements of the internal space of the battery pack and ensure that the cooling medium does not leak during use.

[0063] It can be understood that the third cavity 31 of the guide plate 3 can also be used to connect the second cavity 21 and the first cavity 11 to extend the end cover 2. The first cavity 11 and the third cavity 31 between adjacent battery cells 1 can be welded or respectively provided with mutually matching quick-plug structures, or can be any other connection method. The present application does not impose specific restrictions on the connection method between the first cavity 11 and the third cavity 31, and can meet actual design requirements and ensure that the cooling medium does not leak during use.

[0064] See also Figures 1 to 17In one embodiment, the battery cell 1 is further provided with a plurality of first cavities 11, and the plurality of first cavities 11 are arranged along the opening direction; the battery cell assembly further includes a plurality of end caps 2 and connecting tubes 4 corresponding to the first cavities 11, and the plurality of end caps 2 are respectively connected to the opposite ends of the battery cell 1 through the second cavity 21 and the first cavity 11, and the plurality of end caps 2 at the opposite ends of the battery cell 1 are connected through the connecting tube 4 and the joint 22, and the joint 22, the connecting tube 4, the second cavity 21 and the first cavity 11 are connected to form a third flow channel 113, and the third flow channel 113 is used for circulating the cooling medium.

[0065] In this embodiment, the battery cell 1 increases the contact area between the first cavity 11 and the battery cell 1 by providing multiple first cavities 11. When the cooling medium flows through the multiple first cavities 11 respectively, it can remove more heat, thereby improving the cooling efficiency of the battery cell 1. The connecting tube 4 is used to connect the end caps 2 at opposite ends of the battery cell 1, so that the cooling medium can flow between the multiple end caps 2 to form a complete third flow channel 113. Exemplarily, the cooling medium enters through the joint 22 at one end, is divided by the connecting tube 4, flows into the multiple second cavities 21 and the corresponding first cavities 11, and then flows through the second cavity 21 at the other end. After that, it converges through the connecting tube 4 and flows out from the joint 22 at the other end.

[0066] In the above embodiment, the present application does not impose any specific restrictions on the connection method between the connecting pipe 4 and the joint 22, as long as it can meet the actual design requirements and ensure that the cooling medium does not leak during use. For example, the connecting pipe 4 and the joint 22 can be cold-pressed, welded, or plugged.

[0067] Furthermore, the connecting tube 4 is a single-pass tube 41 and / or a multi-pass tube 42, which can be set according to the number and arrangement of the first cavities 11 of the battery cell 1, so that the battery cell assembly can be designed and assembled more flexibly. According to different application scenarios and cooling requirements, a suitable type of connecting tube 4 can be selected. For example, please refer to Figure 7 and Figure 8 When the battery cell 1 is provided with multiple first cavities 11, they can be arranged relatively up and down. After the upper and lower first cavities 11 are respectively connected to the second cavity 21, the upper and lower end caps 2 can be connected to the joints 22 through a tee pipe or an elbow to form a flow channel for the circulation of the cooling medium.

[0068] It can be understood that, specifically, when the multiple first cavities 11 in the battery cell 1 are in two rows and arranged up and down, the multi-way water pipe is a three-way water pipe; when the multiple first cavities 11 in the battery cell 1 are in three rows and arranged up and down, the multi-way water pipe is a four-way water pipe; and so on, when the multiple first cavities 11 in the battery cell 1 are in N rows and arranged up and down, the multi-way water pipe is N+1 water pipe, one of which is usually used as an interface for the flow in or out of the cooling medium.

[0069] See also Figures 1 to 17 In one embodiment, a diverter structure 12 is provided in the first cavity 11, and the diverter structure 12 is provided along the direction of the openings at both ends of the first cavity 11. The interface of the diverter structure 12 in the first cavity 11 is a corrugated structure.

[0070] In this embodiment, the diversion structure 12 is used to divert the cooling medium to avoid local concentration or poor flow of the cooling medium in the first cavity 11, improve the heat exchange efficiency between the cooling medium and the battery cell 1, and more quickly remove the heat generated by the battery cell 1, thereby improving the cooling efficiency of the entire battery system. For example, ribs are provided in the first cavity 11, and multiple ribs are combined in different ways to form a variety of diversion structures 12. It is understood that when there is a single rib, it is usually arranged along the diagonal or longitudinal center or width center of the cross section of the liquid cooling channel; when there are multiple ribs, any regular or irregular shape can be formed in the cross section of the liquid cooling channel, one of which is a corrugated shape; and the cross section of the third cavity 31 can also be the same shape as the above-mentioned diversion structure 12.

[0071] It can be understood that the ribs provided in the first cavity 11 can increase the contact area between the liquid and the battery cell 1, and the diversion structures 12 formed are isolated from each other by the ribs. Compared with the non-diverting channels, the diversion channels are subjected to the dead weight of the cooling medium by the ribs, which can reduce the influence of the gravity of the liquid itself, and disperse the impact force of the liquid cooling on the inner wall of the flow channel during the flow of the cooling medium.

[0072] Specifically, the cross-section of the first cavity 11 adopts a corrugated corrugated structure design, which provides good strength and rigidity at a relatively low weight. The corrugated shape can effectively disperse stress and increase the bearing capacity of the structure. At the same time, in the corrugated corrugated structure design, the two ends of each rib are inclined when connected to the shell. Compared with the vertical setting of the ribs and the shell connected at both ends, the inclined surface area is relatively large, and the heat generated by the battery cell 1 can also be transferred through the ribs. Therefore, the corrugated corrugated structure design can take away more heat through the inclined ribs, which is equivalent to increasing the surface area of ​​the shell, increasing the contact area between the coolant and the battery cell 1, and improving the cooling efficiency of the battery cell 1. Based on manufacturing cost considerations, the corrugated corrugated structure design is the preferred setting method of this application. This application does not impose specific restrictions on the setting method and specific shape of the ribs. For example, the cross-section of the first cavity 11 can also be a corrugated structure connected by semicircles.

[0073] See also Figures 1 to 17In one embodiment, the present application also provides a battery cell 1 module, including a battery cell assembly as described in any one of the above items, wherein adjacent battery cell assemblies are connected through a connector 22 and a connecting pipe 4, and the connector 22, the connecting pipe 4, the second cavity 21 and the first cavity 11 are connected to form a fourth flow channel 114, and the fourth flow channel 114 is used for the circulation of cooling medium.

[0074] In this example, see Figures 10 to 14 The battery cell 1 module is composed of multiple battery cell assemblies arranged in an array. The connector 22 and connecting tube 4 are located between adjacent battery cell assemblies, connecting them together. The fourth flow channel 114 runs through each battery cell assembly, forming an integrated cooling medium flow path. The connection between the connector 22 and the connecting tube 4 allows the cooling medium to flow continuously between the multiple battery cell assemblies. The fourth flow channel 114 provides a channel for the cooling medium, ensuring that each battery cell assembly is effectively cooled.

[0075] In the above embodiment, the battery cell 1 module can provide a larger energy storage capacity by combining multiple battery cell components, thereby improving the energy density and power output of the entire system.

[0076] For example, Figure 10 and Figure 11 As shown, when a first cavity 11 is provided on the battery cell 1 and adjacent battery cell assemblies are arranged side by side, the adjacent battery cell assemblies are connected via the connector 22 and the single-pass pipe 41. Figure 12 and Figure 14 As shown, when multiple first cavities 11 are provided on the battery cell 1, and the multiple first cavities 11 are arranged relatively up and down, and adjacent components are arranged side by side, the adjacent battery cell components are connected through the joints 22 and the single-way tube 41, and the upper and lower joints 22 are connected through the multi-way tube 42.

[0077] It can be understood that the above arrangement is only for the purpose of facilitating the understanding of the present technical solution and does not represent a specific limitation on the present application. For example, the battery cell components of the present application can also be stacked individually, or they can be stacked as in the above example and connected to the corresponding connectors 22 through straight-through tubes and multi-through tubes 42.

[0078] See also Figures 1 to 17 Specifically, in one embodiment, adjacent battery cells 1 are connected in the same plane.

[0079] In this embodiment, the coplanar connection makes the layout of the battery cells 1 more compact, and more battery cells 1 can be integrated in a limited space, further improving space utilization.

[0080] It should be noted that the coplanarity between adjacent battery cells 1 includes the coplanarity between battery cells 1 arranged side by side and / or stacked on each other. Figures 11 to 14In the example, the side-by-side setting method is as follows: Figure 11 As shown, after the cell assemblies are connected by the connecting tube 4, the large surfaces of two adjacent cell 1 are arranged facing each other, and the two large surfaces overlap and are coplanar. It can be understood that when the cell assemblies are stacked, the adjacent cell 1 forms a relative upper and lower structure between the cell assemblies, and the upper and lower opposite surfaces overlap and are coplanar.

[0081] See also Figures 1 to 17 , specific reference Figures 15 to 17 In one embodiment, the present application further provides a battery, comprising the battery cell 1 module and a box body 5 as described above, wherein the box body 5 is provided with a through hole 51 , and the connecting tube 4 passes through the through hole 51 and is connected to the connector 22 .

[0082] In this embodiment, the housing 5 is used to protect and house the battery cell assembly. Through-holes 51 are used in conjunction with the connecting tube 4, providing a passage for the connecting tube 4 to pass through the housing 5. Through these through-holes 51, the connecting tube 4 connects to the connector 22 of the end cap 2 of the battery cell 1 module located within the housing 5, allowing the cooling medium to circulate within and outside the battery cell 1 module. It is understood that at least two through-holes 51 are provided, one for the connecting tube 4 to flow in, and one for the connecting tube 4 to flow out.

[0083] To sum up, the battery cell assembly provided in the embodiment of the present application includes a battery cell 1, wherein the battery cell 1 is provided with a first cavity 11 with openings at two opposite ends; an end cover 2, wherein the end cover 2 is provided with a second cavity 21 with an opening at one end, and the end cover 2 is connected to the opposite ends of the battery cell 1 through the second cavity 21 and the first cavity 11; the side wall of the second cavity 21 is provided with a connector 22 for communicating with the outside, and the connector 22 is connected with the first cavity 11 and the second cavity 21 to form a first flow channel 111, and the first flow channel 111 is used for circulating a cooling medium. The battery cell 1 provided by the present invention is provided with a first cavity 11 with openings at both ends, and a second cavity 21 is provided on the end cover 2. The side wall of the second cavity 21 is provided with a joint 22 for communicating with the outside. The second cavity 21 is connected to the first cavity 11, and the end cover 2 is set at both ends of the battery cell 1. When the two ends of the first cavity 11 are respectively connected to the second cavity 21, a first flow channel 111 is formed together with the joint 22. The first flow channel 111 can be used for the circulation of a cooling medium, that is, the cooling medium enters through the joint 22 at one end, passes through the second cavity 21, the first cavity 11 and the second cavity 21 in sequence, and then flows out from the joint 22 at the other end, thereby realizing the cooling of the battery cell 1 without connecting to an external liquid cooling plate. The entire battery cell assembly eliminates the use of a traditional liquid cooling plate, simplifies the overall structure, and when applied to a battery, improves the battery space utilization and energy density, reduces the cooling system cost and the battery manufacturing cost.

[0084] Compared with the prior art, the embodiment of the present application provides a battery cell 1 module, including the above-mentioned battery cell assembly. It is understandable that the battery cell 1 module can have all the technical features and beneficial effects of the above-mentioned battery cell assembly, which will not be repeated here.

[0085] Compared with the prior art, the battery provided in the embodiment of the present application includes the above-mentioned battery cell 1 module. It is understood that the battery can have all the technical features and beneficial effects of the above-mentioned battery cell 1 module, which will not be repeated here.

[0086] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery cell assembly, characterized in that: include: A battery cell, wherein the battery cell is provided with a first cavity having two opposite openings; An end cap, wherein the end cap is provided with a second cavity with an open end, and the end cap is connected to opposite ends of the battery cell through the second cavity and the first cavity; The side wall of the second cavity is provided with a joint for communicating with the outside, and the joint is communicated with the first cavity and the second cavity to form a first flow channel, and the first flow channel is used for the circulation of cooling medium.

2. The battery core assembly according to claim 1, characterized in that The battery cell assembly further includes a plurality of battery cells, and adjacent battery cells are connected via a first cavity.

3. The battery cell assembly according to claim 2, characterized in that: The battery cell assembly also includes a guide plate, which is provided with a third cavity with openings at two opposite ends. Adjacent battery cells are connected by the guide plate. The third cavity is connected to the first cavity, the second cavity and the joint to form a second flow channel, which is used for the circulation of cooling medium.

4. The battery core assembly according to claim 3, characterized in that: The guide plate is a straight plate or a curved plate.

5. The battery core assembly according to claim 1, characterized in that: The battery cell is also provided with a plurality of the first cavities, and the plurality of the first cavities are arranged along the opening direction; the battery cell assembly also includes a plurality of end covers and connecting tubes corresponding to the first cavities, and the plurality of end covers are respectively connected to the opposite ends of the battery cell through the second cavity and the first cavity, and the plurality of end covers at the opposite ends of the battery cell are connected through connecting tubes and joints, and the joints, connecting tubes, second cavities and first cavities are connected to form a third flow channel, and the third flow channel is used for the circulation of cooling medium.

6. The battery core assembly according to claim 5, characterized in that: The connecting pipe is a single-way pipe and / or a multi-way pipe.

7. The battery core assembly according to any one of claims 1 to 6, characterized in that: A diversion structure is provided in the first cavity, and the diversion structure is provided along the direction of the openings at both ends of the first cavity.

8. The battery core assembly according to claim 7, characterized in that: The interface of the diversion structure in the first cavity is a corrugated structure.

9. A battery cell module, characterized in that: include: As described in any one of claims 1 to 8 above, adjacent battery cell assemblies are connected by joints and connecting pipes, and the joints, connecting pipes, second cavity and first cavity are connected to form a fourth flow channel, and the fourth flow channel is used for the circulation of cooling medium.

10. The battery cell module according to claim 9, characterized in that: The adjacent battery cells are connected in the same plane.

11. A battery, characterized in that: It comprises the battery cell module according to claim 9 or 10, and a box body, wherein the box body is provided with a through hole, and the connecting pipe passes through the through hole and is connected to the joint.

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