Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment, and relates to the technical field of batteries, the battery device comprises a box body, a battery monomer and a confluence component, the battery monomer is arranged in the box body, the battery monomer comprises a shell and an end cover, the end cover covers the shell along a first direction, the end cover is provided with a first area and a second area which are adjacent to each other, and the confluence component is arranged in the box body. The first area is recessed inwards relative to the second area, and the first area is provided with an electrode terminal; the confluence component is arranged in the box body and electrically connected to the electrode terminal, the confluence component and the second area of the end cover are arranged in a spaced mode in the first direction, a first gap is defined, and a temperature-resistant insulation part is arranged in the first gap. According to the technical scheme provided by the invention, the temperature-resistant insulation part is arranged in the first gap, and the temperature-resistant insulation part can keep the structure stable in a high-temperature state by utilizing the temperature-resistant characteristic of the temperature-resistant insulation part, so that a stable insulation function is achieved, and the condition that short circuit is easy to occur between the confluence component and the end cover is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery device and an electrical equipment. Background Art

[0002] Currently, in a battery device of a new energy vehicle, the electrode terminals of battery cells are located at the end caps, and the electrode terminals of two adjacent battery cells are connected in series and parallel through a busbar component. However, during the charging and discharging process of the battery unit, or when the ambient temperature fluctuates or under abnormal working conditions, heat is generated, which causes the end cap to expand. The expanded end cap is likely to come into contact with the busbar component, thereby causing a short circuit of the battery cell. Summary of the Utility Model

[0003] The main purpose of the present application is to propose a battery device and an electrical equipment, aiming to improve the problem that the end cap of the battery cell in the current battery device is likely to come into contact with the busbar component and cause a short circuit.

[0004] In a first aspect, the battery device proposed by the present application includes:

[0005] A box body;

[0006] Battery cells, arranged in the box body, each battery cell including a housing and an end cap, the end cap covering the housing along a first direction, the end cap having a first region and a second region adjacent to each other, the first region being recessed inward compared with the second region, and the first region being provided with an electrode terminal; and,

[0007] A busbar component, arranged in the box body and electrically connected to the electrode terminal, the busbar component being spaced apart from the second region of the end cap in the first direction and defining a first gap, wherein a temperature-resistant insulating part is arranged in the first gap.

[0008] The technical solution provided by the present application defines a first gap between the busbar component and the second region of the end cap in the first direction, and a temperature-resistant insulating part is arranged in the first gap. When the battery cell is in a heating working condition (for example, the battery cell is in working conditions such as charging and discharging, thermal runaway, etc.), its end cap is likely to thermally expand, and the corresponding busbar component is also likely to be in a high-temperature state. Since the temperature-resistant insulating part has good high-temperature resistance and insulation characteristics, it can stably maintain its own structural form when contacting the high-temperature busbar component, and will not melt due to heat, thereby ensuring the stable performance of its insulation performance and effectively improving the problem that the busbar component and the end cap are likely to come into contact and cause a short circuit.

[0009] In an embodiment, an insulating film is arranged on the outer surface of the end cap, and the insulating film has a first insulating film located in the first gap;

[0010] The temperature-resistant insulating part includes the first insulating film.

[0011] In the above technical solution, a first insulating film is provided at a position on the outer surface of the end cover corresponding to the first gap. The first insulating film has the characteristics of high temperature resistance and insulation. Compared with other types of insulating structures, the first insulating film is relatively thin and light, easier to cover the outer surface of the end cover over a large area, not easy to fall off, and has high reliability.

[0012] In one embodiment, the thickness of the first insulating film is between 0.1 mm and 0.5 mm.

[0013] In the above technical solution, it is more appropriate to control the thickness of the first insulating film between 0.1 mm and 0.5 mm. On the one hand, a thickness of more than 0.1 mm can give the first insulating film sufficient wear resistance, and during the long-term expansion and contraction of the end cover, the first insulating film will not be worn through by the busbar components and lose its function. On the other hand, a thickness of less than 0.5 mm helps to ensure the adhesion of the interface between the first insulating film and the end cover, and is not easy to interfere with the busbar components in the first direction.

[0014] In one embodiment, the insulating film further has a second insulating film. The second insulating film is adjacent to the first insulating film and jointly covers the outer surface of the end cover;

[0015] Wherein, the melting point of the material of the second insulating film is lower than the melting point of the material of the first insulating film.

[0016] In the above technical solution, by arranging the first insulating film and the second insulating film adjacent to each other, they can jointly cover the outer surface of the end cover, endowing the overall outer insulation performance of the end cover. Moreover, since the second insulating film is not in the first gap, the second insulating film is less affected by the high temperature of the busbar components. In terms of material selection, the second insulating film can select a material with a lower melting point, and the overall cost of the insulating film is also lower, with both insulation and cost-effectiveness.

[0017] In one embodiment, the material of the second insulating film is polypropylene or polyethylene terephthalate.

[0018] In the above technical solution, using polypropylene or polyethylene terephthalate to make the second insulating film endows the second insulating film with good insulation performance, which can reduce the risk of arcing between the busbar components and the first area of the end cover. At the same time, the cost of polypropylene or polyethylene terephthalate is relatively low, which is beneficial to controlling the production cost of the battery device.

[0019] In one embodiment, the busbar component has an edge portion that coincides with the second area of the end cover in the first direction. The surface of the edge portion is covered with an insulating jacket, and at least part of the insulating jacket is in the first gap;

[0020] The temperature-resistant insulating portion includes a portion of the insulating jacket located in the first gap.

[0021] In the above technical solution, since the insulating jacket covers the surface of the edge portion, it also covers the surface of the edge portion facing the end cover. The portion of the side surface covered by the insulating jacket is also in the first gap, thereby playing a role of heat-resistant insulation. Moreover, the insulating jacket covers the surface of the side of the edge portion facing away from the end cover, thereby being in a state of clamping the edge portion. This type of structure makes it difficult for the insulating jacket to fall off from the collector component due to heat, thereby ensuring the stable performance of the heat-resistant insulation performance.

[0022] In one embodiment, a contact structure is further provided in the box body, and the contact structure contacts the insulating jacket and presses the insulating jacket against the edge portion.

[0023] In the above technical solution, under the abutting action of the abutting structure, the insulating jacket is stably pressed against the edge. Even under the high temperature of the collector component for a long time, the insulating jacket is not easy to fall off from the edge after aging, which further improves the insulation reliability of the insulating jacket.

[0024] In one embodiment, a harness isolation plate is provided on the side of the edge portion along the second direction, a sampling circuit board is provided on the side of the harness isolation plate away from the battery cell along the first direction, and the sampling circuit board is electrically connected to the current collecting component;

[0025] Wherein, the wire harness isolation plate abuts against the insulating jacket, and the abutment structure includes the wire harness isolation plate;

[0026] The second direction intersects the first direction.

[0027] In the above technical solution, full use is made of the presence of the wiring harness isolation plate in the battery device, so that it abuts the insulating jacket along the second direction, without the need for an additional abutment structure to achieve the abutment function, thus saving the internal space of the box and being beneficial to improving the energy density of the battery device.

[0028] In one embodiment, the temperature-resistant insulating part is made of polyimide or silicone rubber.

[0029] In the above technical solution, polyimide and silicone rubber have good insulation properties and good high-temperature stability. Based on this, when the temperature-resistant insulation part contacts the busbar component, it is not easy to melt or degrade after being subjected to high temperatures, resulting in higher insulation reliability.

[0030] In one embodiment, the energy density of the battery cell is less than or equal to 390 Wh / L, and the melting point of the material of the temperature-resistant insulating part is greater than or equal to 200 °C and less than or equal to 250 °C; and / or,

[0031] The energy density of the battery cell is greater than 390 Wh / L, and the melting point of the material of the temperature-resistant insulating part is greater than 250 °C.

[0032] In the above technical solution, matching the melting point of the material of the temperature-resistant insulating part with the energy density of the battery cell is beneficial to selecting the material of the temperature-resistant insulating part according to the corresponding type of battery cell. While ensuring that the temperature-resistant insulating part has sufficient high-temperature stability, it is also beneficial to control the production cost according to actual requirements.

[0033] In a second aspect, the present application also provides an electrical device, which includes the above battery device. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0035] Figure 1 It is a schematic structural diagram of an embodiment where the electrical device provided by the present application is a vehicle;

[0036] Figure 2 It is an exploded structural schematic diagram of an embodiment of the battery device provided by the present application;

[0037] Figure 3 It is a front-view structural schematic diagram of an embodiment of a battery cell in the battery device provided by the present application;

[0038] Figure 4 For Figure 3 It is an enlarged structural schematic diagram of the first embodiment of the local part A;

[0039] Figure 5 For Figure 3 It is an enlarged structural schematic diagram of the second embodiment of the local part A.

[0040] Explanation of the Reference Numerals in the Drawings:

[0041] 1000, vehicle;

[0042] 100, battery device; 200, controller; 300, motor;

[0043] 1. Busbar component; 1a. Main body part; 1b. Edge part; 2. Box body; 21. Box main body; 22. Box cover; 3. Battery cell; 31. Shell; 32. End cover; 32a. First region; 32b. Second region; 321. Electrode terminal; 41. Insulating film; 411. First insulating film; 412. Second insulating film; 42. Insulating jacket; 4a. Heat-resistant insulating part; 5. Contact structure; 5a. Wiring harness separator; 6a. First gap;

[0044] X. First direction; Y. Second direction; Z. Third direction.

[0045] The realization of the purpose of this application, functional features and advantages will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0046] The embodiments of the technical solutions of this application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of this application more clearly, so they are only examples and cannot be used to limit the protection scope of this application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above accompanying drawings description are intended to cover non-exclusive inclusion.

[0048] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise clearly and specifically defined.

[0049] Referring to "embodiments" herein means that the specific features, structures or characteristics described in conjunction with the embodiments can be included in at least one embodiment of this application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0050] In the description of the embodiments of this application, the term "a plurality of" means two or more (including two). Similarly, "a plurality of groups" means two or more groups (including two groups), and "a plurality of sheets" means two or more sheets (including two sheets).

[0051] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0052] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0053] Currently, in the battery device of a new energy vehicle, the electrode terminals of the battery cells are located at the end caps. The electrode terminals of two adjacent battery cells achieve series and parallel connection through a busbar component. In order to reduce the resistance of the busbar component, improve its overcurrent capacity and mechanical strength, the cross-sectional size of the busbar component is usually set larger than that of the electrode terminal. This also makes the edge of the busbar component usually extend to the side of the electrode terminal and overlap with the end cap in the height direction of the battery cell. During the charging and discharging process of the battery cell, when the ambient temperature fluctuates or under abnormal working conditions, heat will be generated, resulting in the expansion of the end cap. The expanded end cap is likely to approach the busbar component or even directly contact the busbar component, and the risk of short circuit between the busbar component and the end cap is relatively high.

[0054] In some countermeasures, a layer of insulating patch is selected to be pasted on the outer surface of the end cap, which can indeed improve the problem of easy short circuit between the end cap and the busbar component to a certain extent. However, when the battery cell is in an abnormal heating condition, a large amount of heat will be generated inside the battery cell, and a considerable part of the heat will be conducted to the busbar component through the electrode terminal, resulting in a sharp temperature rise of the busbar component. When the busbar component in a high-temperature state contacts the insulating patch, it is easy to melt the insulating patch. After losing the insulation protection of the insulating patch, a short circuit problem may still occur between the busbar component and the end cap.

[0055] Analysis shows that the current insulating patch does not have the characteristic of high temperature resistance, and it can be considered to improve the material of the insulating patch.

[0056] The battery device disclosed in the embodiments of the present application can be used to provide electrical energy for electrical equipment. Among them, the electrical equipment can be, but is not limited to, battery cars, electric vehicles, ships, spacecraft, etc. Among them, spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0057] For the convenience of description in the following embodiments, a vehicle is taken as an example of an electrical equipment in an embodiment of the present application for description.

[0058] Please refer to Figure 1 , Figure 1 FIG. is a schematic structural diagram of an embodiment in which the electrical equipment provided by the present application is a vehicle. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery device 100 is arranged inside the vehicle 1000. The battery device 100 can be arranged at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0059] In some embodiments of the present application, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0060] For the convenience of understanding the battery device provided by the present application, please refer to Figure 2 , Figure 2 FIG. is an exploded structural schematic diagram of an embodiment of the battery device provided by the present application. The battery device 100 generally includes a box body 2 and battery cells 3. An installation cavity is formed inside the box body 2, and the battery cells 3 are loaded through the installation cavity. The basic structure of the box body 2 generally includes a box main body 21 and a box cover 22. The box cover 22 is arranged on the box main body 21 and jointly defines the installation cavity with the box main body 21. Generally speaking, the battery cells 3 are generally arranged in the box main body 21. After the battery device 100 is mounted on the vehicle, the box cover 22 is generally close to the vehicle, and the box main body 21 is generally away from the vehicle; the installation cavity can be mainly formed in the box main body 21. At this time, the box main body 21 can be understood as a basin-shaped structure, and the box cover 22 is covered on the box main body 21 to cover the installation cavity; the installation cavity can also be mainly formed in the box cover 22. At this time, the box cover 22 can be understood as a cover-shaped structure, and the box cover 22 covers the box main body 21 to cover the battery cells 3 carried on the box main body 21 into the box cover 22. Of course, the structure of the box body 2 is not limited to this.

[0061] The number of battery cells 3 in the box body 2 can be one or multiple. When multiple battery cells 3 are provided, the multiple battery cells 3 can be connected in series, parallel or in a combined series-parallel connection. The combined series-parallel connection means that there are both series and parallel connections among the multiple battery cells 3. The multiple battery cells 3 can be directly connected in series, parallel or in a combined series-parallel connection to form a battery assembly. Of course, the multiple battery cells 3 can also be in the form that the battery cells 3 are first connected in series, parallel or in a combined series-parallel connection to form battery modules, and then the multiple battery modules are connected in series, parallel or in a combined series-parallel connection to form a battery assembly. The battery device 100 can also include other structures, such as a busbar component, for realizing the electrical connection among the multiple battery cells 3 or the multiple battery modules. Each battery cell 3 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 3 can be in a cylindrical shape, a flat shape, a cuboid shape or other shapes, etc.

[0062] The structure of the battery cell 3 generally includes a housing, an electrode assembly and an electrode terminal. An accommodation cavity is usually formed inside the housing. The electrode assembly is installed in the accommodation cavity and is led out to the outside of the housing through the electrode terminal provided on the housing wall to be connected to the busbar component of the battery device 100. According to the different structural types of the battery cell 3, the specific type of the "housing" is generally divided into a square housing and a cylindrical housing. The housing generally includes a shell and an end cover. The end cover is covered on the shell to enclose an accommodation cavity with the shell. The electrode terminal is usually provided on the end cover so that after the electrode assembly is integrally connected to the end cover, it can be put into the shell and into the shell body. The "electrode assembly" is usually composed of a positive electrode plate, a negative electrode plate and a separator. Among them, the lithium-ion electrode assembly mainly works by the reciprocating deintercalation and intercalation of lithium ions between the positive electrode plate and the negative electrode plate.

[0063] To improve the above-mentioned technical problems, in the battery device provided in the present application, in addition to the box body 2, the battery cell 3 and the busbar component, it also includes a temperature-resistant insulation part. To facilitate the understanding of the temperature-resistant insulation part provided in the present application and its connection relationship and positional relationship, the following will be described with reference to the drawings. Among them, Figure 3 is a front view structural schematic diagram of an embodiment of a battery cell in the battery device provided in the present application; Figure 4 For Figure 3 is an enlarged structural schematic diagram of the first embodiment of the partial A in Figure 5 For Figure 3 is an enlarged structural schematic diagram of the second embodiment of the partial A in

[0064] Please refer to Figures 3 to 5, in an embodiment of the present application, the battery device 100 includes a box body 2, battery cells 3 and a busbar component 1; the battery cells 3 are arranged in the box body 2, the battery cells 3 include a housing 31 and an end cover 32, the end cover 32 covers the housing 31 along the first direction X, the end cover 32 has a first area 32a and a second area 32b adjacent to each other, the first area 32a is recessed inward compared with the second area 32b, and an electrode terminal 321 is arranged in the first area 32a; the busbar component 1 is arranged in the box body 2 and is electrically connected to the electrode terminal 321, the busbar component 1 is spaced from the second area 32b of the end cover 32 in the first direction X and defines a first gap 6a, wherein a temperature-resistant insulating part 4a is arranged in the first gap 6a.

[0065] It should be noted that the "first area 32a" and the "second area 32b" can be understood as the physical structures on the end cover 32 that can be observed in the first direction X; there can be one or more first areas 32a and second areas 32b on the end cover 32. For example, multiple first areas 32a and multiple second areas 32b can be arranged at intervals in the second direction Y in sequence, as Figure 3 shown, the area between the two vertical dotted lines is the first area 32a of the end cover 32, and the areas on both sides of the first area 32a along the second direction Y are the second areas 32b. Obviously, the second area 32b of the end cover 32 is closer to the busbar component 1; "the electrode terminal 321 is arranged in the first area 32a" means that the electrode terminal 321 penetrates through the first area 32a of the end cover 32 along the first direction X. Since the first area 32a is recessed inward compared with the second area 32b, the first area 32a should be closer to the electrode assembly in the housing 31 along the first direction X than the second area 32b. Generally, there will be a certain gap space between the end cover 32 and the electrode assembly to facilitate the accommodation of the adapter plate and the tab. Arranging the electrode terminal 321 in the first area 32a is beneficial to arranging the electrode terminal 321 closer to the internal electrode assembly, thereby compressing the gap space inside the housing 31, and further improving the space utilization rate inside the battery cell 3 and increasing its energy density.

[0066] There are various electrical connection methods between the busbar component 1 and the electrode terminal 321, including but not limited to welding and threaded connection.

[0067] It is worth mentioning that in the first direction X, the cross-sectional dimension of the busbar component 1 is generally larger than that of the electrode terminal 321. The purpose is to reduce resistance and heat generation, improve the overcurrent capacity, and increase the mechanical properties of the busbar component 1. Therefore, in the embodiment of the present application, although the busbar component 1 is connected to the electrode terminal 321 in the first region 32a of the end cap 32, it can still extend to correspond to and be spaced from the second region 32b of the end cap 32 in the first direction X, so as to define the first gap 6a. Obviously, since the first region 32a is recessed inward compared with the second region 32b, this makes the second region 32b closer to the busbar component 1 in the first direction X.

[0068] A temperature-resistant insulating part 4a is arranged in the first gap 6a. The connection relationship between the temperature-resistant insulating part 4a and other structures has various forms. For example, the temperature-resistant insulating part 4a can be connected to the busbar component 1, or can be connected to the end cap 32. Of course, the temperature-resistant insulating part 4a can also have no connection with both the busbar component 1 and the end cap 32 (obtaining the connection basis through other structures), as long as it can be in the first gap 6a.

[0069] The "temperature-resistant insulating part 4a" refers to a component with high-temperature resistance and electrical insulation characteristics. It needs to withstand at least the high temperature transmitted from the battery cell 3 to the busbar component 1 under abnormal heating conditions. The temperature rise that the busbar component 1 needs to bear is closely related to the energy density of the battery cell 3. That is, the higher the energy density of the battery cell 3, the more heat is released under thermal runaway conditions, and the greater the temperature rise that the busbar component 1 bears. Therefore, the melting point of the temperature-resistant insulating part 4a should match the energy density of the battery cell 3. In this embodiment, the energy density of the battery cell 3 is not limited, and the melting point of the temperature-resistant insulating part 4a is not limited either.

[0070] The technical solution provided by the present application defines a first gap 6a in the first direction X between the busbar component 1 and the second region 32b of the end cap 32, and a temperature-resistant insulating part 4a is arranged in the first gap 6a. When the battery cell 3 is in a heating condition (for example, the battery cell 3 is in charging / discharging, thermal runaway and other conditions), its end cap 32 is prone to thermal expansion, and the corresponding busbar component 1 is also prone to be in a high-temperature state. Since the temperature-resistant insulating part 4a has good high-temperature resistance and insulation characteristics, it can stably maintain its own structural form when contacting the high-temperature busbar component 1, and will not melt due to heat, thereby ensuring the stable exertion of its insulation performance and effectively improving the problem that the busbar component 1 and the end cap 32 are prone to contact short circuit.

[0071] Please refer to Figure 3 and Figure 4In one embodiment, an insulating film 41 is disposed on the outer surface of the end cover 32 , and the insulating film 41 has a first insulating film 411 located in the first gap 6 a ; the temperature-resistant insulating portion 4 a includes the first insulating film 411 .

[0072] It should be noted that the shell 31 of the battery cell 3 usually has an inside and an outside. Based on the fact that the end cover 32 is covered on the shell 31 along the first direction X, the "outer surface of the end cover 32" refers to the surface of the end cover 32 facing the first direction X and away from the shell 31, that is, the surface opposite to the converging component 1 in the first direction X; the insulating film 41 can only include the first insulating film 411, that is, the insulating film 41 can only be arranged on the corresponding outer surface of the second area 32b of the end cover 32 corresponding to the first gap 6a, and can also include other film bodies in addition to the first insulating film 411, so that the insulating film 41 can completely cover the outer surface of the end cover 32, and this embodiment does not limit this; because the temperature-resistant insulating part 4a includes the first insulating film 411, the first insulating film 411 also has the characteristics of high temperature resistance and insulation. In addition to the first insulating film 411, the temperature-resistant insulating part 4a may also include other structures, and this embodiment does not limit this.

[0073] In the above technical solution, a first insulating film 411 is arranged on the outer surface of the end cover 32 at a position corresponding to the first gap 6a. The first insulating film 411 has the characteristics of high temperature resistance and insulation. Compared with other types of insulating structures, the first insulating film 411 is relatively thin and light, and is easier to cover a large area of ​​the outer surface of the end cover 32. It is not easy to fall off and has higher reliability.

[0074] In one embodiment, the thickness of the first insulating film 411 is between 0.1 mm and 0.5 mm.

[0075] It should be noted that “the thickness of the first insulating film 411 is between 0.1 mm and 0.5 mm” means that the thickness can take any value between 0.1 mm and 0.5 mm, for example, it can be 0.1 mm, 0.25 mm, or 0.5 mm. This embodiment does not limit the specific value of the thickness.

[0076] In the above technical solution, it is more appropriate to control the thickness of the first insulating film 411 between 0.1 mm and 0.5 mm. On the one hand, a thickness above 0.1 mm can give the first insulating film 411 sufficient wear resistance. During the long-term expansion and contraction of the end cover 32, the first insulating film 411 will not be worn out by the convergence component 1 and lose its function. On the other hand, a thickness below 0.5 mm helps to ensure the adhesion of the interface between the first insulating film 411 and the end cover 32, and is not easy to interfere with the convergence component 1 in the first direction X.

[0077] See also Figure 4, in one embodiment, the insulating film 41 further has a second insulating film 412. The second insulating film 412 is adjacent to the first insulating film 411 and jointly covers the outer surface of the end cap 32. Among them, the melting point of the material of the second insulating film 412 is lower than that of the material of the first insulating film 411.

[0078] It should be noted that "the second insulating film 412 is adjacent to the first insulating film 411" means that the second insulating film 412 and the first insulating film 411 are adjacent and integrally connected in the extending direction of the end cap 32. For example Figure 4 As shown in, the second insulating film 412 and the first insulating film 411 are arranged and adjacent in the second direction Y. There are various ways for the two to be adjacent to each other, such as a hot pressing process (heating the second insulating film 412 and the first insulating film 411 and applying pressure to make them melt and combine at the contact edge), an ultrasonic welding process (using ultrasonic energy to locally melt and combine the second insulating film 412 and the first insulating film 411 at the contact edge), etc. This embodiment does not limit this.

[0079] "The second insulating film 412 and the first insulating film 411 jointly cover the outer surface of the end cap 32" means that the overall size of the insulating film 41 after the second insulating film 412 and the first insulating film 411 are adjacent to each other is equivalent to the outer surface size of the end cap 32. Among them, the first insulating film 411 mainly covers the part of the second region 32b of the end cap 32 corresponding to the first gap 6a, and the second insulating film 412 covers the remaining regions (mainly including the first region 32a of the end cap 32 and the remaining part of the second region 32b).

[0080] "The melting point of the material of the second insulating film 412 is lower than that of the material of the first insulating film 411" means that as long as the melting point of the material of the second insulating film 412 is lower than that of the material of the first insulating film 411. This embodiment does not limit the specific range of the melting point of the material of the second insulating film 412. Usually, when dealing with the heating condition of the battery cell 3, the first insulating film 411 usually needs to have a higher melting point. The higher the melting point of the material, the higher the corresponding material cost. Based on this, setting the melting point of the material of the second insulating film 412 to be lower than that of the material of the first insulating film 411 can obviously reduce the overall cost of the insulating film 41.

[0081] In the above technical solution, by arranging the first insulating film 411 and the second insulating film 412 adjacent to each other, they can jointly cover the outer surface of the end cap 32, endowing the end cap 32 with overall external insulation performance. Moreover, since the second insulating film 412 is not in the first gap 6a, the second insulating film 412 is less affected by the high temperature of the busbar component 1. In terms of material selection, the second insulating film 412 can select a material with a lower melting point, and the overall cost of the insulating film 41 is also lower, having both insulation and cost performance.

[0082] In one embodiment, the material of the second insulating film 412 is polypropylene or polyethylene terephthalate.

[0083] It should be noted that both "polypropylene" and "polyethylene terephthalate" have good electrical insulation properties. At the same time, both are relatively easy to mold and have relatively low melting points, and their production costs are relatively low.

[0084] In the above technical solution, the second insulating film 412 is made of polypropylene or polyethylene terephthalate, which endows the second insulating film 412 with good insulation performance, can reduce the risk of arcing between the busbar component 1 and the first region 32a of the end cap 32. At the same time, the cost of polypropylene or polyethylene terephthalate is relatively low, which is beneficial to controlling the production cost of the battery device 100.

[0085] Please refer to Figure 3 and Figure 5 , in one embodiment, the busbar component 1 has an edge portion 1b that coincides with the second region 32b of the end cap 32 in the first direction X. An insulating jacket 42 is disposed on the surface of the edge portion 1b, and at least a part of the insulating jacket 42 is located in the first gap 6a; the temperature-resistant insulating portion 4a includes the part of the insulating jacket 42 located in the first gap 6a.

[0086] It should be noted that the busbar component 1 usually has an extended plane that is perpendicular to the first direction X. The busbar component 1 usually also has a main body portion 1a directly connected to the electrode terminal 321. Based on this, the "edge portion 1b" refers to a part of the structure of the busbar component 1 located at the edge of its extended plane, that is, the part of the structure adjacent to the main body portion 1a; the edge portion 1b coincides with the second region 32b of the end cap 32 in the first direction X. When the battery cell 3 is in a heating condition, the second region 32b of the end cap 32 usually expands close to the edge portion 1b, and the first gap 6a is also located between the edge portion 1b and the second region 32b of the end cap 32; the "surface of the edge portion 1b" usually includes a first surface facing the end cap 32 and a second surface facing away from the end cap 32 in the first direction X, and a third surface connecting the first surface and the second surface. The third surface is arranged in the extending direction of the busbar component 1, and the insulating jacket 42 is also arranged to cover the first surface, the second surface and the third surface, and is in a state of clamping the edge portion 1b in the first direction X.

[0087] In the above technical solution, since the insulating jacket 42 covers the surface of the edge portion 1b, it also covers the surface of the edge portion 1b facing the end cover 32. The portion of the side surface covered by the insulating jacket 42 is also located in the first gap 6a, thereby playing a role of heat-resistant insulation. Moreover, the insulating jacket 42 covers the surface of the edge portion 1b facing away from the end cover 32, thereby being in a state of clamping the edge portion 1b. This type of structure makes it difficult for the insulating jacket 42 to fall off from the conduit component 1 due to heat, thereby ensuring the stable performance of the heat-resistant insulation performance.

[0088] See also Figure 5 In one embodiment, a contact structure 5 is further provided in the box body 2, and the contact structure 5 contacts the insulating jacket 42 and presses the insulating jacket 42 against the edge portion 1b.

[0089] It should be noted that the abutment structure 5 is arranged in the box body 2 and abuts against the insulating jacket 42. It should generally be considered that the setting position of the abutment structure 5 is fixed relative to the insulating jacket 42. This embodiment only limits the abutment structure 5 to being able to press the insulating jacket 42 against the edge portion 1b by abutting against the insulating jacket 42, and does not limit the direction in which the abutment structure 5 abuts against the insulating jacket 42. For example, the abutment structure 5 can abut against the insulating jacket 42 along the first direction X from the side of the conduit component 1 away from the end cover 32, or can abut against the insulating jacket 42 from other directions; the abutment structure 5 can be specially set to abut against the insulating jacket 42, and of course it can also have other functions at the same time, which is not limited in this embodiment.

[0090] In the above technical solution, under the abutment of the abutment structure 5, the insulating jacket 42 is stably pressed against the edge portion 1b. Even if the current collecting component 1 is subjected to high temperature for a long time, the insulating jacket 42 is not easy to fall off from the edge portion 1b after aging, thereby further improving the insulation reliability of the insulating jacket 42.

[0091] See also Figure 5 In one embodiment, a harness isolation plate 5a is provided on the side of the edge portion 1b along the second direction Y, and a sampling circuit board is provided on the side of the harness isolation plate 5a away from the battery cell 3 along the first direction X, and the sampling circuit board is electrically connected to the busbar component 1; wherein the harness isolation plate 5a abuts against the insulating jacket 42, and the abutting structure 5 includes the harness isolation plate 5a; the second direction Y intersects with the first direction X.

[0092] It should be noted that the sampling circuit board is electrically connected to the busbar component 1, and its purpose is to collect current parameters flowing through the busbar component 1, collect voltage parameters on the busbar component 1, collect temperature parameters of the busbar component 1, etc. The sampling circuit board is usually an important component of the battery management system in the battery device 100; a plurality of wires are usually connected between the sampling circuit board and the busbar component 1, and the main function of the wire harness isolation plate 5a is to manage the wiring of multiple wire harnesses and ensure electrical isolation between different wires. This embodiment does not limit the specific structural type of the wire harness isolation plate 5a.

[0093] In the above technical solution, full use is made of the presence of the wiring harness isolation plate 5a in the battery device 100, so that it abuts the insulating jacket 42 along the second direction Y, without the need to additionally set up an abutment structure 5 to achieve the abutment function, thus saving the internal space of the box 2 and facilitating the improvement of the energy density of the battery device 100.

[0094] Specifically, in one embodiment, a plurality of battery cells 3 are stacked along the third direction Z, a plurality of bus components 1 are correspondingly arranged, and form a bus arranged along the third direction Z; the wiring harness isolation plate 5a is arranged in contact with a plurality of insulating jackets 42 of the bus; the first direction X, the second direction Y, and the third direction Z intersect each other.

[0095] In one embodiment, the material of the temperature-resistant insulating portion 4 a is polyimide or silicone rubber.

[0096] It should be noted that "polyimide" is a high-performance polymer with good insulation and high-temperature stability, and its melting point is usually above 300°C; "silicone rubber" is a synthetic rubber with silicon-oxygen bonds as the main chain, which also has good insulation and high-temperature stability, and it usually begins to thermally degrade between 300°C and 400°C.

[0097] In the above technical solution, polyimide and silicone rubber have good insulation properties and good high-temperature stability. Based on this, when the temperature-resistant insulating part 4a contacts the busbar component 1, it is not easy to melt or degrade after being subjected to a high temperature, resulting in higher insulation reliability.

[0098] In one embodiment, the energy density of the battery cell 3 is less than or equal to 390Wh / L, and the melting point of the material of the temperature-resistant insulating portion 4a is greater than or equal to 200° C. and less than or equal to 250° C.

[0099] Among them, "the melting point of the material of the temperature-resistant insulating part 4a is greater than or equal to 200 °C and less than or equal to 250 °C" means that the melting point of the material of the temperature-resistant insulating part 4a can take any value between 200 °C and 250 °C. For example, the melting point of the material of the temperature-resistant insulating part 4a can be 200 °C, 235 °C, or 250 °C. Generally speaking, on the premise of ensuring that it does not melt itself, the higher the melting point of the material, the higher the reliability of the material.

[0100] In one embodiment, the energy density of the battery cell 3 is greater than 390 Wh / L, and the melting point of the material of the temperature-resistant insulating part 4a is greater than 250 °C.

[0101] Among them, "the melting point of the material of the temperature-resistant insulating part 4a is greater than 250 °C" means that the melting point of the material of the temperature-resistant insulating part 4a can take any value above 250 °C. For example, the melting point of the material of the temperature-resistant insulating part 4a can be 251 °C, 260 °C, or 290 °C. Generally speaking, the higher the melting point of the material, the higher the reliability of the material.

[0102] It should be noted that in this embodiment, the unit of "the energy density of the battery cell 3" is watt-hour per liter (Wh / L), which refers to the electric energy that the battery cell 3 can store per unit volume. This energy density is an important indicator to measure the compactness of the battery cell 3. Generally speaking, the magnitude of the energy density of the battery cell 3 is closely related to the amount of heat that can be released after the battery cell 3 undergoes thermal runaway, thus closely related to the temperature of the busbar component 1, and further closely related to the temperature that the temperature-resistant insulating part 4a needs to withstand.

[0103] In the above technical solution, matching the melting point of the material of the temperature-resistant insulating part 4a with the energy density of the battery cell 3 is beneficial to selecting the material of the temperature-resistant insulating part 4a according to the corresponding model of the battery cell 3. While ensuring that the temperature-resistant insulating part 4a has sufficient high-temperature stability, it is also beneficial to control the production cost according to actual requirements.

[0104] This application also proposes an electrical device, which includes a battery device 100. The specific structure of the battery device 100 refers to the above embodiment. Since this electrical device adopts all the technical solutions of the above all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one. Among them, the battery device 100 is used to provide electrical energy for the electrical device. The electrical device includes, but is not limited to, new energy vehicles such as pure electric vehicles, hybrid vehicles, and range-extended electric vehicles, and can also include aircraft such as electric drones and electric passenger aircraft.

[0105] The present application provides a battery device 100, which includes a box body 2, a battery cell 3 and a busbar component 1. The battery cell 3 is arranged in the box body 2. The battery cell 3 includes a shell 31 and an end cover 32. The end cover 32 is covered on the shell body 31 along a first direction X. The end cover 32 has a first area 32a and a second area 32b adjacent to each other. The first area 32a is recessed inwardly compared to the second area 32b. The first area 32a is provided with an electrode terminal 321. The busbar component 1 is arranged in the box body 2 and is electrically connected to the electrode terminal 321. The busbar component 1 is spaced apart from the second area 32b of the end cover 32 in the first direction X and defines a first gap 6a. The end cover 3 2 is provided with an insulating film 41, the insulating film 41 includes a first insulating film 411 and a second insulating film 412, the melting point of the first insulating film 411 is higher than the melting point of the second insulating film 412, the first insulating film 411 is provided corresponding to the second region 32b, and at least partially in the first gap 6a, the second insulating film 412 is provided corresponding to the first region 32a, wherein, when the energy density of the battery cell 3 is less than or equal to 390Wh / L, the melting point of the material of the first insulating film 411 can be selected to be greater than or equal to 200°C and less than or equal to 250°C, and when the energy density of the battery cell 3 is greater than 390Wh / L, the melting point of the material of the first insulating film 411 can be selected to be greater than 250°C.

[0106] The present application proposes a battery device 100, which includes a box body 2, a battery cell 3, a wiring harness isolation plate 5a and a busbar 1. The battery cell 3 is arranged in the box body 2. The battery cell 3 includes a shell 31 and an end cover 32. The end cover 32 is covered on the shell body 31 along a first direction X. The end cover 32 has a first area 32a and a second area 32b adjacent to each other. The first area 32a is recessed inwardly compared to the second area 32b. The first area 32a is provided with an electrode terminal 321. A plurality of busbars 1 are arranged in the box body 2 and are electrically connected to the electrode terminals 321 of two adjacent battery cells 3 respectively. The busbar 1 has an edge portion 1b that overlaps with the second area 32b of the end cover 32 in the first direction X. The edge portion 1b overlaps with the second area 32b of the end cover 32 in the first direction X. b are arranged at intervals and define a first gap 6a, the surface of the edge portion 1b is covered with an insulating jacket 42, and the insulating jacket 42 is at least partially located in the first gap 6a, the wiring harness isolation plate 5a is arranged in the box body 2 and is located on the side of the converging component 1, and a sampling circuit board is arranged on the side of the wiring harness isolation plate 5a away from the battery cell 3 along the first direction X, the sampling circuit board is electrically connected to the converging component 1, and the wiring harness isolation plate 5a is in contact with the insulating jacket 42 along the second direction Y; wherein, when the energy density of the battery cell 3 is less than or equal to 390Wh / L, the melting point of the material of the insulating jacket 42 can be selected to be greater than or equal to 200°C and less than or equal to 250°C, and when the energy density of the battery cell 3 is greater than 390Wh / L, the melting point of the material of the insulating jacket 42 can be selected to be greater than 250°C.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Box; A battery cell is disposed in the box, the battery cell comprises a shell and an end cover, the end cover is covered on the shell along a first direction, the end cover has a first area and a second area adjacent to each other, the first area is recessed inwardly compared to the second area, and the first area is provided with an electrode terminal; as well as, A current collecting component is arranged in the box body and electrically connected to the electrode terminal. The current collecting component is spaced apart from the second area of ​​the end cover in the first direction and defines a first gap, wherein a temperature-resistant insulating portion is arranged in the first gap.

2. The battery device according to claim 1, characterized in that An insulating film is provided on the outer surface of the end cover, and the insulating film has a first insulating film located in the first gap; The temperature-resistant insulating portion includes the first insulating film.

3. The battery device according to claim 2, characterized in that: The thickness of the first insulating film is between 0.1 mm and 0.5 mm.

4. The battery device according to claim 2, characterized in that: The insulating film further comprises a second insulating film, wherein the second insulating film and the first insulating film are adjacent to each other and jointly cover the outer surface of the end cap; The melting point of the material of the second insulating film is lower than the melting point of the material of the first insulating film.

5. The battery device according to claim 4, characterized in that: The second insulating film is made of polypropylene or polyethylene terephthalate.

6. The battery device according to claim 1, wherein: The confluence component has an edge portion that overlaps with the second area of ​​the end cover in the first direction, the surface of the edge portion is covered with an insulating jacket, and the insulating jacket is at least partially located in the first gap; The temperature-resistant insulating portion includes a portion of the insulating jacket located in the first gap.

7. The battery device according to claim 6, characterized in that: The box body is further provided with an abutting structure, which abuts against the insulating jacket and presses the insulating jacket against the edge portion.

8. The battery device according to claim 7, characterized in that: A harness isolation plate is disposed on the side of the edge portion along the second direction, a sampling circuit board is disposed on the side of the harness isolation plate away from the battery cell along the first direction, and the sampling circuit board is electrically connected to the converging component; Wherein, the wire harness isolation plate abuts against the insulating jacket, and the abutment structure includes the wire harness isolation plate; The second direction intersects the first direction.

9. The battery device according to any one of claims 1 to 8, characterized in that: The material of the heat-resistant insulating part is polyimide or silicone rubber.

10. The battery device according to any one of claims 1 to 8, characterized in that: The energy density of the battery cell is less than or equal to 390Wh / L, the melting point of the material of the heat-resistant insulating part is greater than or equal to 200° C. and less than or equal to 250° C.; and / or, The energy density of the battery cell is greater than 390Wh / L, and the melting point of the material of the heat-resistant insulating part is greater than 250°C.

11. An electrical device, characterized in that: Comprising the battery device according to any one of claims 1 to 10.

Images